An automatic preparation system and preparation method for a catalyst slurry

Abstract

The present invention discloses an automatic catalyst slurry preparation system and a preparation method, which include a raw material adding device, a pulping device and a circulating grinding device. The raw material adding device includes a pure water pipeline, a first flowmeter, a powder feeding tank, a first weighing unit, at least one liquid raw material storage tank, a first adding pump and a second weighing unit. The pulping device includes a pulping mixing tank, a powder adding machine, a dust removal filter, an in-tank stirrer, a third weighing unit, a jacket layer coated on the outer side of the pulping mixing tank and a heat transfer medium pipeline. The circulating grinding device includes a first circulating pump, a vertical grinding machine and a mixing filter. The automatic catalyst slurry preparation system designed by the present invention realizes the automatic proportioning and feeding of various raw materials by setting multiple weighing units, flowmeters, grinding devices and filtering devices, has high production efficiency, reduces the labor intensity and health damage of operators, solves the problems of uniformity and repeatability in the pulping process, and enhances the consistency of slurry products in different batches.

Description

Technical Field

[0001] The present invention relates to the field of coating slurry preparation, and particularly to an automatic preparation system and method for catalyst slurry. Background Art

[0002] Automobile catalysts are the most effective and crucial automotive components that use effective catalytic purification technologies to reduce harmful substances in vehicle exhaust. An automotive catalytic converter is a complex of a series of chemical materials, consisting of a catalyst carrier, a coating, a catalyst promoter, and an active ingredient.

[0003] Catalyst pulping is the first and most fundamental process in catalyst production. The slurry preparation system must produce a slurry with a combination of catalyst promoters, active ingredients, and a basic coating. At the same time, it is necessary to ensure that the slurry has good fluidity, uniformity, and anti-settling stability to avoid stratification or particle aggregation during the coating process. Based on the two major reaction functions of oxidation catalysis and reduction catalysis, and for the exhaust gas components under different working conditions, different products such as TWC, DOC, SCR, DPF, POC, and ASC have been derived for automotive catalysts. The slurries and characteristics required for different products are also completely different. The characteristics of various slurries for National VI catalysts are relatively wide, including non-Newtonian fluid materials with high solid content, as well as thin slurries with low suspension characteristics and weak viscoelastic characteristics. At the same time, due to the significant changes in the physical properties of the raw materials for National VI catalysts, the particle size of the materials has been greatly reduced, the chemical activity of the catalyst has increased, and the health damage to operators is relatively large.

[0004] Currently, domestic catalyst slurry preparation systems generally adopt non-standard designs according to specific processes, with a relatively long cycle from design to installation and commissioning, high costs, and limited later expansion capabilities. Once a production enterprise needs to expand the product type or production capacity according to its own development situation, it is necessary to customize a new preparation system again, increasing the enterprise's investment costs, consuming time and effort, and also occupying a large amount of production space.

[0005] In addition, due to the insufficient understanding of the characteristics of equipment and devices by most enterprises, it is impossible to select matching production processes and equipment components. A large amount of manual work increases the labor intensity and the risk of health damage, and also brings quality instability. The workload of changeover and cleaning is large, the cleaning time is long, and the material loss is relatively large. Summary of the Invention

[0006] In order to solve the problems existing in the prior art, the present invention provides an automatic preparation system and method for catalyst slurry, which realizes the automatic proportioning and feeding of various raw materials, increases production efficiency, and reduces the labor intensity and health damage of operators. The technical solutions are as follows:

[0007] On the one hand, the present invention provides an automatic preparation system for catalyst slurry with high repeatability and high controllability, which includes a raw material adding device, a pulping device and a circulating grinding device. The raw material adding device includes a pure water pipeline for adding pure water raw materials and a first flowmeter for measuring the adding amount of pure water raw materials flowing through it; the raw material adding device further includes a powder feeding tank for adding powder raw materials and a first weighing unit for weighing the powder feeding tank, and the first weighing unit is used for measuring the adding amount of powder raw materials in the powder feeding tank;

[0008] The raw material adding device further includes at least one liquid raw material storage tank for adding liquid raw materials, a first adding pump arranged on the pipeline between the liquid raw material storage tank and the pulping mixing tank, and a second weighing unit for weighing the liquid raw material storage tank, and the second weighing unit is used for measuring the adding amount of liquid raw materials in the liquid raw material storage tank;

[0009] The pulping device includes a pulping mixing tank connected to the raw material adding device, a powder adding machine for conveying powder raw materials to the pulping mixing tank, a dust removal filter connected to the pulping mixing tank, an in-tank stirrer for stirring the raw materials in the pulping mixing tank, and a third weighing unit for weighing the pulping mixing tank, and the third weighing unit is used for weighing the adding weight of the materials in the pulping mixing tank; the in-tank stirrer includes a rotating paddle and a scraper arranged on the rotating paddle, the scraper can be in contact with the inner wall of the pulping mixing tank, and the scraper rotates with the rotation of the rotating paddle;

[0010] The pulping device further includes a jacket layer covering the outside of the pulping mixing tank and a heat transfer medium pipeline connected to the jacket layer, and a temperature regulating medium is contained in the heat transfer medium pipeline, and the temperature regulating medium is one of cooling water, high-temperature water, high-temperature heat-conducting oil or steam;

[0011] The circulating grinding device includes a first circulation pump connected to the pulping mixing tank, a vertical grinding machine connected to the first circulation pump, and a mixing filter connected to both the pulping mixing tank and the vertical grinding machine.

[0012] Furthermore, the vertical powder adding machine includes a powder adding assembly, and the powder adding assembly includes a first driving mechanism, a hollow shell, a jacket main shaft arranged in the hollow shell, and a powder suction port communicated with the hollow shell. A hollow structure is formed between the hollow shell and the jacket main shaft, and the powder raw materials in the powder feeding tank can enter the hollow structure through the powder suction port;

[0013] The upper end of the jacketed main shaft is connected to the first driving mechanism, and its lower end extends out of the hollow housing. A stirring paddle is fixedly arranged circumferentially at the lower end thereof. A housing with a hollow structure is arranged outside the hollow housing so that the stirring paddle is accommodated in the housing. Driven by the first driving mechanism, the jacketed main shaft rotates, thereby driving the stirring paddle to rotate.

[0014] Further, the vertical powder adding machine further includes a pneumatic lifting mechanism. The pneumatic lifting mechanism includes a lifting guide rail, an extension arm connected to the lifting guide rail, and a second driving mechanism connected to the extension arm. The first driving mechanism is connected to the extension arm. The lifting guide rail is arranged parallel to the hollow housing and perpendicular to the extension arm. Driven by the second driving mechanism, the extension arm moves along the length direction of the lifting guide rail, thereby driving the powder adding assembly to move axially in the pulp mixing tank to approach or move away from it.

[0015] Further, the vertical grinder includes a grinding assembly, a transmission mechanism, and a power mechanism. The grinding assembly includes a grinding chamber, a main shaft capable of extending into the grinding chamber, a dispersion disc arranged outside the main shaft, a plurality of baffle rings arranged on the inner wall of the grinding chamber, a filter screen arranged at the bottom of the inner part of the grinding chamber, and an upper end cover and a lower end cover respectively arranged at the upper and lower ends of the grinding chamber. A material inlet and a material outlet are arranged on the grinding chamber. The material inlet is close to the upper part of the grinding chamber, and the material outlet is arranged at the bottom of the grinding chamber;

[0016] The grinding chamber has a hollow cavity. The dispersion disc includes a plurality of grinding components arranged in sequence from top to bottom. A gap is maintained between every two adjacent grinding components. The grinding components are arranged along the circumferential direction of the main shaft. A plurality of grinding beads are arranged in the cavity of the grinding chamber. Driven by the power mechanism, the transmission mechanism drives the main shaft to rotate, so as to drive the grinding components to rotate, and further drive the grinding beads to move.

[0017] Further, the mixing filter includes a housing, a stirring component arranged in the housing, a filter screen arranged in the housing, and an end cover detachably arranged at one end of the housing. The stirring component is an integral structure and is fixedly connected to the end cover; the housing has a hollow cavity extending along its axis. The stirring component extends along the axis of the hollow cavity. The filter screen is arranged around the inner side wall of the housing. A plurality of filter holes are distributed on the filter screen;

[0018] The housing has a first feed inlet, a second feed inlet, and a discharge outlet. The first feed inlet and the second feed inlet are both arranged at one end of the housing far from the end cover. A material addition valve is arranged at the second feed inlet; the discharge outlet is close to the end cover, and a sampling valve is arranged at one end of the housing with the end cover.

[0019] Further, the liquid raw material storage tank includes a first liquid raw material storage tank and a second liquid raw material storage tank. A first addition pump is provided on the pipeline between the first liquid raw material storage tank and the pulping mixing tank, and a second addition pump is provided on the pipeline between the second liquid raw material storage tank and the pulping mixing tank. The catalyst slurry automatic preparation system further includes a compressed air automatic purging pipeline communicated with the pipeline in the circulating grinding device.

[0020] Further, the raw material addition device further includes a third addition pump for adding the noble metal solution raw material and a second flowmeter for measuring the addition amount of the noble metal solution raw material flowing through it. The third addition pump is connected to the feed port of the mixing filter, or the third addition pump is connected to the pulping mixing tank.

[0021] On the other hand, the present invention also provides a preparation method based on the catalyst slurry automatic preparation system, which is characterized by including the following steps:

[0022] S1. Set the corresponding qualified weights and qualified ranges of various raw materials required in the formula of the catalyst carrier;

[0023] S2. Use the third weighing unit to measure the original weight of the pulping mixing tank;

[0024] S3. Add a raw material into the pulping mixing tank, and measure the addition amount through the weighing unit or flowmeter of the raw material addition device corresponding to this raw material;

[0025] S4. Use the third weighing unit to measure the first weight of the pulping mixing tank containing the raw material in step S3; then calculate the difference between the first weight and the original weight, and judge whether this difference is within the qualified range of one of the raw materials. If so, execute step S5; if not, return to step S3;

[0026] S5. Add another raw material other than the raw material added in step S3 into the pulping mixing tank through the corresponding raw material addition device, and the addition amount is measured by the weighing unit or flowmeter of the corresponding raw material addition device;

[0027] S6. Use the third weighing unit to measure the second weight of the pulping mixing tank containing the raw material, then calculate the difference between the second weight and the first weight, and judge whether this difference is within the qualified range of one of the raw materials. If so, execute step S7; if not, return to step S5;

[0028] S7. Add another raw material other than the raw material added in step S3 and the raw material added in step S5 into the pulping mixing tank through the corresponding raw material addition device, and the addition amount is measured by the weighing unit or flowmeter of the corresponding raw material addition device;

[0029] S8. Measure the third weight of the pulping mixing tank containing the raw materials in step S7 using the third weighing unit, then calculate the difference between the third weight and the second weight, and determine whether this difference is within the qualified range of one of the raw materials. If so, execute step S9; if not, return to step S7;

[0030] S9. Add another raw material other than the raw materials added in step S3, the raw materials added in step S5, and the raw materials added in step S7 to the pulping mixing tank. Then, measure the fourth weight of the pulping mixing tank containing the raw materials using the third weighing unit, calculate the difference between the fourth weight and the third weight, and determine whether this difference is within the qualified range of one of the raw materials.

[0031] S10. Continue to add any one of the remaining raw materials each time until all the raw materials are added to obtain the catalyst mixed slurry.

[0032] Further, after each of steps S4 - S9 is completed separately, the following steps may also be included:

[0033] Transport the raw materials in the pulping mixing tank to a vertical grinder. After grinding, transport the raw materials to a mixing filter for filtration, and then transport the filtered raw materials back to the pulping mixing tank.

[0034] Further, after step S10, the following steps may also be included:

[0035] Measure the total weight of the pulping mixing tank using the third weighing unit, then calculate the difference between the total weight and the preset qualified total weight of various raw materials required in the formula, and determine whether this difference is within the deviation range. If so, the slurry is qualified; if not, the slurry is unqualified.

[0036] The beneficial effects brought by the technical solution provided by the present invention are as follows:

[0037] a. The catalyst slurry automatic preparation system designed by the present invention realizes the automatic proportioning and feeding of various raw materials by setting multiple weighing units, flow meters, grinding devices, and filtering devices. It has a short pulping time, high production efficiency, reduces the labor intensity and health damage of operators, solves the problems of uniformity and repeatability in the pulping process, enhances the consistency of slurry products in different batches, and meets the strict quality management specifications of the automotive industry;

[0038] b. The catalyst slurry automatic preparation system designed by the present invention adopts a fast production process design for multiple batches and multiple specifications; the produced products have fast product changeover, fast cleaning, high efficiency, low residual materials, and low waste, meeting the automation, intelligence, and refinement of national VI catalyst production;

[0039] c. Highly integrated and technological, with high-precision computer feedback for valves and instruments, facilitating precise control of the process; small land area requirement, flexible layout, rational utilization of space, and greatly improved space utilization rate within the plant; flexible expandability, with reserved interfaces and rich functions; special component and structure design, convenient maintenance, and long service life;

[0040] d. For the catalyst slurry automatic preparation system and preparation method designed by the present invention, the addition of all raw materials adopts a mode of one-time direct measurement and secondary measurement review, which can ensure the accuracy of raw material addition and thus stabilize the reliability of slurry quality;

[0041] e. The preparation system and preparation method designed by the present invention can produce a slurry with good fluidity, ensure the uniformity of catalyst coating thickness, and at the same time, the slurry has good anti-settling stability, avoiding stratification or particle aggregation during the coating process. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0043] Figure 1 is the front view of the catalyst slurry automatic preparation system provided by the embodiment of the present invention;

[0044] Figure 2 is the side view of the catalyst slurry automatic preparation system provided by the embodiment of the present invention;

[0045] Figure 3 is the front view of the powder feeder of the catalyst slurry automatic preparation system provided by the embodiment of the present invention;

[0046] Figure 4 is the front view of the filter of the catalyst slurry automatic preparation system provided by the embodiment of the present invention;

[0047] Figure 5 is the front view of the vertical grinder of the catalyst slurry automatic preparation system provided by the embodiment of the present invention.

[0048] Among them, the attached drawing reference numerals include: 1 - pulping mixing tank, 2 - first circulation pump, 3 - vertical grinder, 31 - grinding chamber, 32 - dispersion disc, 33 - filter screen, 34 - lower end cover, 35 - baffle ring, 36 - upper end cover, 37 - double mechanical seal, 38 - main shaft, 39 - driven pulley, 40 - driving pulley, 51 - power mechanism, 52 - hydraulic cylinder, 53 - equipment housing, 54 - hydraulic solenoid valve group, 55 - hydraulic pump, 56 - hydraulic oil tank, 57 - equipment base, 4 - mixing filter, 41 - material addition valve, 42 - stirring component, 43 - housing, 44 - filter screen, 45 - end cover, 46 - sampling valve, 5 - third addition pump, 6 - powder feeding tank, 7 - vertical powder feeder, 70 - hollow housing, 71 - jacketed main shaft, 72 - stirring paddle, 73 - powder suction port, 74 - connecting flange, 75 - sealing structure, 76 - first driving mechanism, 77 - extension arm, 78 - second driving mechanism, 79 - lifting guide rail, 80 - housing cover, 81 - base, 8 - first addition pump, 9 - first liquid raw material storage tank, 10 - dust removal filter, 11 - second liquid raw material storage tank, 12 - second addition pump, 13 - first pressure sensor, 14 - pure water pipeline, 15 - first flowmeter, 16 - second flowmeter, 17 - third weighing unit, 18 - first weighing unit, 19 - second weighing unit, 20 - in-tank stirrer, 201 - scraper, 21 - heat transfer medium pipeline, 22 - electric control cabinet, 23 - jacket layer. Detailed implementation manners

[0049] In order to enable those skilled in the art of this technology to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0050] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, device, product or equipment including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or equipment.

[0051] In one embodiment of the present invention, an automatic preparation system for catalyst slurry is provided. For the specific structure, refer to Figure 1 and Figure 2 , which includes a raw material adding device, a pulping device, and a circulating grinding device.

[0052] The raw material adding device includes a pure water pipeline 14 for adding pure water raw materials and a first flowmeter 15 for measuring the adding amount of pure water raw materials flowing through it. The pure water inlet is shown as Figure 1 indicated by b in

[0053] The raw material adding device further includes a powder feeding tank 6 for adding powder raw materials and a first weighing unit 18 for weighing the powder feeding tank. The powder feeding tank 6 is used to hold powder raw materials. By taring, the first weighing unit 18 can measure the adding amount of powder raw materials in the powder feeding tank.

[0054] The powder feeding tank is provided with a plurality of powder medium feeding ports, and pipelines can be connected at the feeding ports. The pipelines are respectively connected to the second-layer powder storage bins, and automatic feeding can be carried out according to process requirements.

[0055] The raw material adding device further includes at least one liquid raw material storage tank for adding liquid raw materials, a first adding pump 8 arranged on the pipeline between the liquid raw material storage tank and the pulping and mixing tank 1, and a second weighing unit 19 for weighing the liquid raw material storage tank. By taring, the second weighing unit 19 can measure the adding amount of liquid raw materials in the liquid raw material storage tank, and the liquid raw materials are accurately added into the pulping and mixing tank through the first adding pump 8.

[0056] According to the different ratios of different catalyst slurries, a plurality of liquid raw material storage tanks can be provided. In one embodiment provided by the present invention, the liquid raw material storage tanks include a first liquid raw material storage tank 9 and a second liquid raw material storage tank 11. A first adding pump 8 is arranged on the pipeline between the first liquid raw material storage tank 9 and the pulping and mixing tank 1. The first liquid raw material storage tank 9 contains a first liquid raw material, and the first liquid raw material is transported into the first liquid raw material storage tank 9 through the first adding pump 8. A second adding pump 12 is arranged on the pipeline between the second liquid raw material storage tank 11 and the pulping and mixing tank 1. The second liquid raw material storage tank 11 contains a second liquid raw material, and the second liquid raw material is transported into the first liquid raw material storage tank 9 through the second adding pump 12.

[0057] The pulping device includes a pulping mixing tank 1 connected to the raw material adding device, a powder adding machine 7 for conveying powder raw materials to the pulping mixing tank 1, a dust removal filter 10 connected to the pulping mixing tank 1, an in-tank stirrer 20 for stirring the raw materials in the pulping mixing tank 1, and a third weighing unit 17 for weighing the pulping mixing tank. By taring, the third weighing unit 17 can weigh the added weight of the materials in the pulping mixing tank; the in-tank stirrer 20 includes a rotating paddle and scraping plates 201 evenly arranged on the rotating paddle. The scraping plates 201 can contact the inner wall of the pulping mixing tank 1, and the scraping plates 201 rotate with the rotation of the rotating paddle to scrape the substances on the inner wall of the tank body.

[0058] The pulping device further includes a jacket layer 23 wrapped outside the pulping mixing tank 1 and a heat transfer medium pipeline 21 connected to the jacket layer 23. A temperature regulating medium is accommodated in the heat transfer medium pipeline 21, and the temperature regulating medium is one of cooling water, high-temperature water, high-temperature heat transfer oil or steam. The heat transfer medium pipeline 21 can contain cooling water for cooling the pulping mixing tank 1; or the heat transfer medium pipeline 21 can contain high-temperature water, high-temperature heat transfer oil or steam for heating the pulping mixing tank 1. The type and temperature of the heat transfer medium are selected according to the different formula requirements of various slurries.

[0059] A special bottom tank ball valve is configured at the bottom of the pulping mixing tank 1. A pipeline can be connected to the valve port, and a switching valve port with a standard interface is fixed on the pipeline, which can be automatically switched according to process requirements. The special bottom tank ball valve can eliminate the dead zone in the tank and prevent the slurry from precipitating or caking at the valve port.

[0060] The specific structure of the powder adding machine 7 is as follows: It is installed on the top of the pulping mixing tank. The vertical powder adding machine 7 includes a powder adding component. The powder adding component includes a first driving mechanism 76, a hollow shell 70, a jacket main shaft 71 arranged in the hollow shell 70, and a powder suction port 73 communicated with the hollow shell 70; a hollow cavity structure for accommodating the inhaled materials is formed between the hollow shell 70 and the jacket main shaft 71, and the powder raw materials in the powder feeding tank enter the hollow structure of the hollow shell 70 through the powder suction port 73. The hollow shell 70 is preferably a cylindrical structure or a cubic structure, and the hollow shell 70 can be other realizable structural forms with a hollow cavity.

[0061] The upper end of the jacketed main shaft 71 is connected to the first driving mechanism 76, and its lower end extends out of the hollow housing 70. A stirring paddle 72 is circumferentially and fixedly arranged at the lower end thereof. The stirring paddle 72 has various structures. For example, the stirring paddle 72 is a two-blade stirring blade, a three-blade stirring blade or a multi-blade stirring blade, that is, the stirring paddle 72 includes one or more blades. A single blade can be a wedge-shaped hollow fan ring with a certain thickness, or the blade is in a strip structure, or the blade is in a petal-shaped structure.

[0062] A cover 80 with a hollow structure is provided outside the hollow housing 70 so that the stirring paddle 72 is accommodated in the cover 80. The stirring paddle 72 does not contact the inner side wall of the cover 80. The cover 80 is close to the lower end of the hollow housing 70. The cover 80 is fixedly connected to the hollow housing 70 through a bracket. The bracket is preferably a tripod, which plays a role of fixed connection and makes the cover 80 have an open structure at both the upper end and the lower end, such as a hollow cylindrical structure.

[0063] When the lower part of the hollow housing 70 and the lower part of the jacketed main shaft 71 extend into the pulping and mixing tank 1 containing liquid, and the cover 80 contacts the liquid, that is, both the cover 80 and the stirring paddle 72 must be immersed below the liquid level of the pulping and mixing tank 1. Driven by the first driving mechanism 76 (the first driving mechanism is preferably a motor), the jacketed main shaft 71 rotates around its own axis, and then drives the stirring paddle 72 to rotate at a high speed inside the cover 80. The liquid on the stirring paddle 72 is pushed away, and eddy currents and vacuums are generated at the root of the blade. This vacuum is transmitted to the powder suction port through the hollow structure of the hollow housing. The vacuum can successively suck the powder raw materials in the powder feeding tank into the powder suction port, the hollow housing and the stirring paddle 72, so that the powder raw materials and the liquid in the pulping and mixing tank 1 are quickly mixed and dispersed.

[0064] The hollow housing 70, the jacketed main shaft 71, the cover 80 and the bracket are all made of stainless steel, with high strength and improved service life.

[0065] The powder suction port 73 is close to the upper part of the hollow housing 70. A valve is provided on the powder suction port 73. The valve can be disassembled from the powder suction port 73. When the powder raw materials in the powder feeding tank need to be input into the pulping and mixing tank 1 through the vertical powder feeder 7, the valve is opened; when not needed, the valve is closed.

[0066] In an embodiment of the present invention, the vertical powder adding machine 7 further includes a pneumatic lifting mechanism and a base 81 disposed on one side of the pulp mixing tank 1. The specific structure of the pneumatic lifting mechanism is as follows: The pneumatic lifting mechanism includes a lifting guide rail 79 disposed on the base 81, an extension arm 77 connected to the lifting guide rail 79, and a second driving mechanism 78 connected to the extension arm 77. The first driving mechanism 76 is connected to the extension arm 77. The lifting guide rail 79 is arranged in parallel with the hollow housing 70, and the lifting guide rail 79 is perpendicular to the extension arm 77. Driven by the second driving mechanism 78, the extension arm 77 moves along the length direction (i.e., the up and down direction) of the lifting guide rail 79, thereby driving the powder adding assembly to move close to or away from the pulp mixing tank 1 along its axial direction (i.e., the up and down direction). The second driving mechanism 78 is a cylinder, and the piston rod of the cylinder is connected to the extension arm 77. By providing the pneumatic lifting mechanism, the position of the stirring paddle 72 can be adjusted according to the liquid level in the pulp mixing tank 1, so as to achieve the maximum powder suction effect.

[0067] The vertical powder adding machine further includes a sealing structure 75 disposed between the first driving mechanism 76 and the hollow housing 70. The sealing structure 75 is preferably a double mechanical seal structure, which serves to seal the first driving mechanism 76 and the hollow housing 70. Double mechanical seals are relatively common mechanical rotary seals, and there are many brands and models available. The sealing structure in this application is not limited. The vertical powder adding machine further includes a connecting flange 74 sleeved outside the hollow housing 70, which is used to cooperate with the pulp mixing tank, so that the hollow housing 70 and the pulp mixing tank form a closed structure, enhancing the sealing performance; the connecting flange is a conventional design, and its specific structure is not described in this application.

[0068] The specific implementation manner of using the vertical powder adding machine in a pulp configuration process is as follows: The powder suction port of the vertical powder adding machine is connected to the discharge port of the powder feeding tank through a pipeline. When the stirring paddle is completely submerged below the liquid level of the pulp mixing tank, the stirring paddle is driven by the motor to rotate at a high speed. Eddy currents and vacuums are generated at the stirring paddle, and this vacuum can completely suck the powder raw materials in the powder feeding tank to the stirring paddle, so that the powder raw materials are quickly mixed and dispersed with the liquid in the pulp mixing tank. The paddle disperses the powder raw materials at a high speed so that they can be quickly dissolved in the liquid or form a suspension mixture with the liquid, avoiding aggregation and precipitation when the powder contacts the liquid, and also preventing dust from being wasted and polluting the working environment. When this process is carried out continuously, the powder raw materials in the powder feeding tank are completely and quickly sucked into the pulp mixing tank, without causing raw material loss and waste, and at the same time ensuring the accuracy of powder raw material addition.

[0069] The vertical powder adding machine is equipped with a pneumatic lifting mechanism, which can adjust the position of the paddle according to the liquid level in the tank to achieve the maximum powder suction effect.

[0070] During the slurry preparation process, the powder suction port of the powder adding machine is connected to the discharge port of the powder weighing tank through a pipeline. Vacuum can completely suck the powder raw materials in the powder weighing tank into the paddle area and quickly mix and disperse them with the liquid in the pulp mixing tank. When this process is carried out continuously, the powder in the powder weighing tank is completely and quickly sucked into the pulp mixing tank, without causing raw material loss and waste, and at the same time ensuring the addition accuracy.

[0071] A dust removal filter 10 is installed at the top of the pulp mixing tank to prevent powder from flying out when the powder adding machine is working. The feed port of the powder adding machine is connected to an automatic pure water valve, which can automatically carry out high-pressure water cleaning inside the main shaft of the powder adding machine to wash the residual slurry on the inner wall of the powder suction pipeline clean, so as to ensure that the accuracy of the powder raw materials will not be affected by impurities during the next use.

[0072] The circulating grinding device includes a first circulation pump 2 connected to the pulp mixing tank 1, a vertical grinding machine 3 connected to the first circulation pump 2, and a mixing filter 4 connected to both the pulp mixing tank 1 and the vertical grinding machine 3.

[0073] The specific structure of the vertical grinding machine 3 is as follows: The vertical grinding machine includes a grinding assembly, a transmission mechanism, and a power mechanism 51. The grinding assembly includes a grinding chamber 31, a main shaft 38 that can extend into the grinding chamber 31, a dispersion disc 32 arranged outside the main shaft 38, a plurality of baffle rings 35 arranged on the inner wall of the grinding chamber 31, a filter screen 33 arranged at the bottom of the grinding chamber 31, and a lower end cover 34 and an upper end cover 36 respectively arranged at both ends of the grinding chamber 31. The grinding chamber 31 will not undergo displacement changes during the process of grinding materials.

[0074] The specific structure of the grinding chamber 31 is as follows: The grinding chamber 31 has a hollow cavity. A material inlet and a material outlet are arranged on the grinding chamber 31. The material inlet is close to the upper part of the grinding chamber 31, as indicated by e in Figure 5 ; The material outlet is arranged at the bottom of the grinding chamber 31, as indicated by f in Figure 5 , that is, materials can continuously enter the grinding chamber 31 from top to bottom. The grinding chamber 31 preferably has a structure that becomes narrower from top to bottom, such as a conical structure, so that the materials can be fully ground when entering the grinding chamber.

[0075] The specific structure of the dispersion disc 32 is as follows: The dispersion disc 32 includes a plurality of grinding components arranged in sequence from top to bottom. There is a spacing between every two adjacent grinding components. The grinding components are arranged in the circumferential direction of the main shaft 38. The grinding components are two-blade type blades, three-blade type blades or multi-blade type blades. A single blade has various structural forms. For example, a single blade can be a hollow fan-shaped ring with a certain thickness, or the blade is in a strip structure, or the blade is in a petal-shaped structure. The blade is inclined relative to the horizontal plane, and a good grinding and stirring effect can be achieved.

[0076] In an embodiment provided by the present invention, the specific structure of the transmission mechanism is as follows: The transmission mechanism includes a main pulley 40 and a driven pulley 39 arranged opposite to each other. The chain is wound around the main pulley 40 and the driven pulley 39. The main pulley 40 is connected to the power mechanism 51, and the driven pulley 39 is connected to the main shaft 38. The power mechanism 51 is preferably a main motor.

[0077] A plurality of grinding beads are arranged in the cavity of the grinding chamber 31. The diameter size of the grinding beads is determined according to the particle size of the material to be ground. The total volume of the plurality of grinding beads is 50-70% of the volume of the grinding chamber 31. Driven by the power mechanism 51, the transmission mechanism drives the main shaft 38 to rotate, and then drives the grinding components to rotate. The rotation of the grinding components drives the grinding beads to turn up and down. The material passes through the grinding chamber from top to bottom. After the grinding beads in the cavity are driven by the dispersion disc, they contact the material reversely from bottom to top and squeeze and crush the solid particles in the slurry (the solid particles are dispersed by grinding. The automotive catalyst slurry preparation system must produce a slurry with a combination of catalyst additives, active ingredients and a basic coating. At the same time, ensure that the slurry has good fluidity, uniformity, and anti-settling stability, and avoid stratification or particle aggregation during the coating process), achieving a good grinding and stirring effect, realizing the uniformity of the material, so as to obtain a uniform material solution. The grinding beads are made of wear-resistant materials such as glass and ceramics.

[0078] Further, a plurality of baffle rings 35 are arranged on the inner wall of the grinding chamber 31. The baffle ring 35 is in a ring structure, that is, the baffle ring 35 is attached to the inner wall. When the material enters the grinding chamber from the material inlet from top to bottom, during the rotation of the main shaft 38 and the dispersion disc 32, by setting the baffle ring 35, the material liquid can be fully contacted with the dispersion disc, and the contact time can be extended to improve the grinding and stirring effect.

[0079] Further, a filter screen 33 is arranged at the bottom of the grinding chamber 31. A plurality of filter holes are arranged on the filter screen 33. The diameter of the filter holes is smaller than the diameter of the grinding beads. The filter screen 33 is used to filter impurities and prevent the grinding beads from flowing out to the material outlet.

[0080] A double mechanical seal structure 37 is provided between the upper end cover 36 and the main shaft 38 to enhance the sealing performance and prevent the materials in the grinding chamber from overflowing. The double mechanical seal structure 37 can be two sealing rings sleeved outside the main shaft, and cooling water under pressure is passed between the two sealing rings, which can prevent the materials from being extruded into the connection between the main shaft and the double mechanical seal structure when the main shaft rotates. The cooling water can take away part of the heat generated at the connection between the main shaft and the double mechanical seal structure when the main shaft rotates. When the main shaft rotates, neither the double mechanical seal structure nor the upper end cover rotates. Double mechanical seals are relatively common mechanical rotary seals, and there are many brands and models to choose from. The double mechanical seal structure in this application is not limited.

[0081] Further, both the inside of the upper end cover 36 and the inside of the lower end cover 34 have hollow structures capable of accommodating a cooling medium. The upper and lower surfaces of the upper end cover 36 are flat plates, and one of the inner sides has a raised spiral flow guiding groove. When the upper and lower surfaces are combined, the middle part is a suspended structure. After the suspended part of the outer circumference of the upper end cover 36 is welded and sealed, cooling water can be introduced. During the grinding process of some materials, more heat will be generated, which will affect the material performance. Introducing cooling water can reduce the temperature to maintain the material performance.

[0082] The vertical grinder further includes a lifting mechanism. The lifting mechanism includes a hydraulic cylinder 52, a hydraulic oil tank 56, a hydraulic pump 55, and a hydraulic solenoid valve group 54. The hydraulic oil tank 56, the hydraulic pump 55, and the hydraulic solenoid valve group 54 form a hydraulic circuit. The hydraulic cylinder 52 and the hydraulic oil tank 56 are both arranged on the equipment base 57. The piston rod of the hydraulic cylinder 52 is connected to the transmission mechanism. Driven by the hydraulic cylinder 52, the transmission mechanism drives the components to move until they are separated from the grinding chamber 31, which is convenient for manual cleaning of the inside of the grinding chamber. For example, the main shaft 38, the upper end cover 36, and the dispersion disc 32 move upward to separate from the grinding chamber 31, and the main shaft 38 moves away from the grinding chamber 31; they move downward to approach the grinding chamber 31 until the upper end cover 36 is arranged on the grinding chamber 31, and part of the main shaft 38 is inside the grinding chamber 31.

[0083] The vertical grinder is arranged inside the equipment housing 53 for protection and also for convenient installation.

[0084] The novel vertical grinder provided in this application is suitable for the production of materials with high viscosity (slow flow) and the production requiring minimization of the residual materials in the grinding chamber, such as the grinding production of catalyst slurries containing precious metals; the materials to be ground enter the grinding chamber through the material inlet and are discharged from the material outlet. The ground materials can naturally drain out from the lower material outlet by gravity.

[0085] Furthermore, the grinding chamber 31 is connected to an external compressed air automatic purging pipeline or a cleaning liquid pipeline, so that the compressed air or the cleaning liquid can enter the grinding chamber through the material inlet. When cleaning the grinding chamber, compressed air or cleaning liquid (or pure water) is introduced through the material inlet to flush the grinding chamber. After cleaning, there is very little residual accumulated material in the grinding chamber, and it is even possible not to open the grinding chamber for cleaning. The residual material in the grinding chamber can be effectively discharged and cleaned, thus reducing a large amount of time and workload for manual disassembly and cleaning.

[0086] The novel vertical grinder provided by this application can discharge and clean the residual material in the grinding chamber while ensuring good grinding effect, with high production efficiency, reducing the labor intensity and health damage of operators. It can not only achieve good grinding and stirring effect, realize the uniformity of materials to obtain a uniform material solution, but also discharge the residual material in the grinding chamber, with good cleaning effect, short grinding time, high production efficiency, reducing the labor intensity and health damage of operators; it requires a small floor area, is flexible in layout, convenient for maintenance, and has a long service life.

[0087] The vertical grinders are arranged separately, and a certain maintenance space is reserved between the pulping modules, which is convenient for the maintenance of the vertical grinders. The vertical grinder can achieve the best cleaning effect, is suitable for preparing national VI catalysts, and can achieve automatic flexible production and rapid product changeover.

[0088] The specific structure of the mixing filter 4 is as follows: The mixing filter 4 includes a housing 43, a stirring component 42 arranged in the housing 43, a filter screen 44 arranged in the housing 43, and an end cover 45 detachably arranged at one end of the housing 43. The stirring component 42 is fixedly connected to the end cover 45, and the end cover 45 is detachably arranged on the housing 43 through a sanitary chuck. After the end cover is unloaded, the stirring component 42, the filter screen and other components inside the housing 43 can be taken out, which is convenient for inspection, cleaning or manual cleaning of the inside of the housing 43, and at the same time, reinstallation is also very convenient.

[0089] The specific structure of the housing 43 is as follows: The housing 43 has a hollow cavity extending along its axis, and the housing 43 is preferably a cylindrical structure. One end of the housing 43 is provided with an end cover 45, and the other end is provided with a sealing cover. The first feed inlet is communicated with the housing 43 through the sealing cover, and the sealing cover is fixedly connected to the housing 43, such as by welding, to increase the sealing performance.

[0090] The housing 43 has a first feed inlet, a second feed inlet and a discharge outlet (the first feed inlet is indicated by g in Figure 4 and the discharge outlet is indicated by Figure 4As shown in Figure 0 (indicated by the arrow in the figure), the first feed port and the second feed port are both provided at one end of the housing 43 away from the end cap 45. The first material is input into the housing 43 through the first feed port. A material addition valve 41 is provided at the second feed port. By opening the material addition valve 41, the second material can be input into the housing 43 through the second feed port. The setting of the material addition valve 41 enables the second material to be quickly and safely input into the second feed port. The flow direction of the first material entering the housing through the first feed port is perpendicular to the flow direction of the second material entering the housing through the second feed port.

[0091] The discharge port is provided on the outer side wall of the housing 43 and is close to the end cap 45. The flow direction of the material through the discharge port is perpendicular to the flow direction of the material through the first feed port; A sampling valve 46 is provided at one end of the housing 43 with the end cap 45, enabling quick and safe sampling of the mixed material.

[0092] The specific structure of the stirring component is as follows: The stirring component 42 extends along the axial direction of the housing 43. The stirring component 42 is an integral structure. The stirring component 42 is preferably a continuously structured spiral-shaped blade or a wave-shaped blade. The stirring component 42 can also be other structures, such as other irregularly shaped blades extending outward. When the first material solution and the second material solution pass through the housing 43, they both have a certain flow rate. Under the guidance of the blades of the stirring component 42, the forward flow rate of the first material solution generates radial and tangential velocities, enabling the second material solution added through the second feed port to quickly mix with the first material solution. If there are solid particles in one of the materials, the other material can adhere and combine with the solid particles; Since the housing 43 is made of stainless steel and has good thermal conductivity, the heat generated during the mixing process can be carried away by the on-line mixing filter housing. The stirring component 42 remains stationary when the material passes through the mixing filter housing. Without the need for other external power drives, it can promote the full mixing of the two materials, thus saving energy consumption.

[0093] In an embodiment provided by the present invention, an automotive catalyst slurry is prepared through a mixing filter. The first material is a slurry obtained by mixing multiple materials, and there are solid particles in the slurry. The second material is a precious metal solution, and there is a little precipitation in the precious metal solution. When the first material passes through the mixing filter, under the guidance of the stirring component in the cavity, the forward flow rate of the first material generates radial and tangential velocities, enabling the precious metal solution to quickly adhere and combine with the solid particles in the first material, preventing the hydrolysis of the precious metal.

[0094] A spacing is maintained between one end of the stirring component 42 away from the end cap 45 and the end of the housing 43 with the first feed port, facilitating a certain mixing space when the two materials enter the housing 43.

[0095] In an embodiment provided by the present invention, the filter screen 44 is arranged around the inner side wall of the housing 43, and a plurality of filter holes are distributed on the filter screen 44; the filter screen 44 is detachably arranged in the housing 43, which is convenient for unloading and reinstallation. The filter screen 44 is of an annular structure and surrounds the inside of the housing 43. Arranging a filter screen inside the in-line mixing filter can intercept impurities such as precipitation and precipitation in the material, improve the anti-settling stability of the discharged mixed material, have a good filtering effect, and avoid stratification or particle aggregation in the subsequent process.

[0096] When two raw materials are mixed by the mixing filter, the forward flow rate of one material is guided by the blades of the stirring components in the cavity to generate radial and tangential velocities, so that the two materials are fully mixed to form a mixed solution. The heat generated during the mixing process can be taken away by the housing of the mixing filter. The internal filter screen of the mixing filter can intercept impurities such as precious metal precipitation and precipitation, improve the anti-settling stability of the mixed material, and avoid stratification or particle aggregation in the subsequent process.

[0097] The raw material adding device further includes a third adding pump 5 for adding the precious metal solution raw material and a second flow meter 16 for measuring the adding amount of the precious metal solution raw material flowing through it. The third adding pump 5 is connected to the feed inlet of the mixing filter 4, or the third adding pump 5 is connected to the pulping mixing tank 1. The third adding pump 5 is used to accurately add the precious metal solution into the mixing filter or the pulping mixing tank 1. The adding speed and total adding amount of the precious metal solution are measured by the second flow meter 16. Since the precious metal solution is expensive, accurate measurement is required to reduce waste.

[0098] After all the raw materials are mixed in the pulping mixing tank to form a slurry, when the slurry passes through the mixing filter again, the forward flow rate of the slurry is guided by the blades of the stirring components in the cavity to generate radial and tangential velocities, so that the precious metal solution added here can quickly adhere and combine with the solid particles in the slurry. The heat generated during the mixing process can be taken away by the housing of the mixing filter. The internal filter screen of the mixing filter can intercept the slurry impurities brought by precious metal precipitation, precipitation, grinding bead inclusion, etc., improve the anti-settling stability of the slurry, and avoid stratification or particle aggregation in the subsequent process. The in-line mixing filter is equipped with a sampling valve, which can quickly and safely sample the slurry. One end is an end cover that can be quickly opened and is connected by a sanitary chuck. After the end cover is opened, the internal stirring components, filter screen, sampling valve and other components can be taken out for inspection, cleaning or manual cleaning. There is a little precipitation in the precious metal solution. The third adding pump 5 is preferably connected to the feed inlet of the mixing filter 4, and the precipitated precious metal solution is filtered and then transported to the pulping mixing tank.

[0099] The catalyst slurry automatic preparation system further includes compressed air communicated with the pipeline in the circulating grinding device (see the compressed air inletFigure 1 (a) Automatically purge the pipeline. When the delivery pump delivers all the slurry in the pulping mixing tank to the subsequent process equipment, the automatic valve at the inlet end of the first circulation pump opens, and compressed air is introduced into the pipeline to purge the residual slurry in the entire delivery pipeline. If the first pressure sensor 13 at the compressed air pipeline shows a low pressure, the automatic control software will alarm to remind the operator to check whether there is any residual material inside.

[0100] The powder raw materials in the powder feeding tank 6 are measured and then passed through the powder feeder 7 to mix the powder raw materials with the pure water and liquid raw materials in the slurry mixing tank 1 to form a mixture. The mixture is cyclically ground by the vertical grinder 3 to finally produce a catalyst active slurry coating that meets the physical and chemical properties.

[0101] When the pulping process is finished, the pulping transfer is completed and before the pulping ingredients are re-made, the cleaning spray device inside the pulping mixing tank (the pulping mixing tank has multiple cleaning spray devices built in it, and is connected to the pure water pipeline and automatic valve) and the pure water valve are opened, and the inside of the pulping mixing tank is automatically cleaned with high-pressure water to rinse the residual pulp on the inner wall of the pulping mixing tank. The cleaning liquid passes through the "slurry outlet" interface (see Figure 1 After the cleaning liquid in the tank is collected, the automatic valve connected to the pure water at the inlet end of the first circulation pump is opened, and the inside of the slurry conveying pipeline can be automatically cleaned with high-pressure water to rinse the residual slurry on the inner wall of the pipeline. The pure water used for cleaning is cumulatively measured by the first flow meter 15. A second pressure sensor is provided on the pipeline between the pure water pipeline 14 and the first flow meter 15. If the second pressure sensor of the pure water pipeline shows a low pressure, the automatic control software alarms to remind the operator to confirm whether there is any residual material inside after the cleaning effect is not good.

[0102] The automatic catalyst slurry preparation system provided by the present invention also includes multiple storage bins for storing raw materials with various different characteristics, and placed on the second-floor platform. The powder raw materials in the bins are quantitatively transported by a screw feeder and fed into a powder feeding tank arranged on the first-floor platform by gravity.

[0103] The catalyst slurry automatic preparation system provided by the present invention also includes an electrical control cabinet 22, which includes a touch operation display screen, a control system, a frequency converter, and automatic control software, and can complete the slurry making process according to different slurry formulas. The proportioning and addition of all raw materials adopts a direct measurement and a secondary measurement review mode to stabilize the reliability of the slurry quality. Based on the automatic control software, all preparation process data can be recorded and saved for quality traceability.

[0104] The pulping mixing tank is fixed on the main platform frame, including a platform, legs at the bottom of the platform, a frame fixed around the platform, and a staircase fixed on one side of the platform. An electrical control cabinet is fixed on one side of the platform. The components inside the cabinet are connected to the motors, sensors, automatic valves, etc. of each device through cables, and the cables are laid in cable trays. A circulation pump, an addition pump, a powder feeder, a mixing filter, a weighing device, a powder feeding tank, as well as various automatic valves, pipelines, instruments, etc. are installed on the platform frame and combined with the main platform to form an integrated pulping module. The vertical grinder is arranged separately from the main platform and is connected to the pulping module through a hose. The power supply and control of the vertical grinder are connected to the electrical control cabinet through cables. The vertical grinder is arranged separately, and a certain maintenance space is reserved between it and the pulping module to facilitate the maintenance and repair of the vertical grinder.

[0105] The present invention also provides a preparation method based on the catalyst slurry automatic preparation system described above, which includes the following steps:

[0106] S1. Set the corresponding qualified weights and qualified ranges of various raw materials required in the formula of the catalyst carrier;

[0107] S2. Use the third weighing unit to measure the original weight of the pulping mixing tank;

[0108] S3. Add a raw material (referred to as the first raw material for short) into the pulping mixing tank, and measure the addition amount through the weighing unit or flowmeter of the raw material addition device corresponding to this raw material (the addition amount of the first raw material is measured in real time during the addition process). It can be assumed that the first raw material is pure water, and the first flowmeter is used to measure its actual addition amount;

[0109] S4. Use the third weighing unit to measure the first weight of the pulping mixing tank containing the raw material in step S3, then calculate the difference between the first weight and the original weight, and determine whether this difference is within the qualified range of one of the raw materials. If so, execute step S5; if not, return to step S3; at this time, "if not" is divided into two cases. The first case is that this difference is less than the qualified range, indicating that the addition amount of the first raw material is less than the qualified weight, and it is necessary to return to step S3 and continue to add this raw material until this raw material is within the preset qualified range; the second case is that this difference is greater than the qualified range, indicating that the addition amount of the first raw material is greater than the qualified weight, and it is necessary to judge whether to extract the excess raw material or redesign the qualified weights of each raw material in the formula; through the above difference measurement, it can also be judged whether the first raw material is pure water. If it is pure water and this difference is within the qualified range of pure water, then execute step S5; through this step of rechecking the addition amount, the accuracy of raw material addition can be guaranteed;

[0110] S5. Add another raw material (the second raw material) other than the raw materials added in S3 into the pulping mixing tank through the corresponding raw material adding device. The addition amount is measured by the weighing unit or flowmeter of the corresponding raw material adding device. During the addition process, the addition amount of the second raw material is measured in real time. It can be assumed that the second raw material is a powder raw material, and the first weighing unit is used to obtain its actual addition amount;

[0111] S6. Use the third weighing unit to measure the second weight of the pulping mixing tank containing the raw materials, then calculate the difference between the second weight and the first weight, and determine whether this difference is within the qualified range of one of the raw materials. If so, execute step S7; if not, return to step S5. At this time, "if not" is divided into two cases. The first case is that this difference is less than the qualified range, indicating that the addition amount of the second raw material is less than the qualified weight, and it is necessary to return to step S5 and continue to add this raw material until this raw material is within the preset qualified range; the second case is that this difference is greater than the qualified range, indicating that the addition amount of the second raw material is greater than the qualified weight, and it is necessary to determine whether to abandon or redesign the qualified weights of each raw material in the formula;

[0112] S7. Add yet another raw material (the third raw material) other than the raw materials added in step S3 and the raw materials added in step S5 into the pulping mixing tank through the corresponding raw material adding device. The addition amount is measured by the weighing unit or flowmeter of the corresponding raw material adding device. During the addition process, the addition amount of the third raw material is measured in real time. It can be assumed that the third raw material is a liquid raw material, and the second weighing unit is used to obtain its actual addition amount;

[0113] S8. Use the third weighing unit to measure the third weight of the pulping mixing tank containing the raw materials in step S7, then calculate the difference between the third weight and the second weight, and determine whether this difference is within the qualified range of one of the raw materials. If so, execute step S9; if not, return to step S7. At this time, "if not" is divided into two cases. The first case is that this difference is less than the qualified range, indicating that the addition amount of the third raw material is less than the qualified weight, and it is necessary to return to step S7 and continue to add this raw material until this raw material is within the preset qualified range; the second case is that this difference is greater than the qualified range, indicating that the addition amount of the third raw material is greater than the qualified weight, and it is necessary to determine whether to abandon or redesign the qualified weights of each raw material in the formula;

[0114] S9. Add another raw material (the fourth raw material) other than the raw materials added in step S3, step S5, and step S7 into the pulping mixing tank. The addition amount is measured by the weighing unit or flowmeter of the corresponding raw material adding device. During the addition process, the addition amount of the fourth raw material is measured in real time. It can be assumed that the fourth raw material is a precious metal solution raw material, and the second flowmeter is used to obtain its actual addition amount. Then, use the third weighing unit to measure the fourth weight of the pulping mixing tank containing the raw materials, calculate the difference between the fourth weight and the third weight, and determine whether this difference is within the qualified range of one of the raw materials. The detection method is the same as that in S7 and S8.

[0115] S10. Continue to add any one of the remaining raw materials each time. Each time a raw material is added, it is carried out through direct measurement once and secondary measurement verification once until all raw materials are added, and the catalyst mixed slurry is obtained.

[0116] In practical applications, the formulas are different, and the types of raw materials to be added in each formula are different. According to the number of types of raw materials, it is determined how many times steps S3 (belonging to direct measurement once) and S4 (belonging to secondary measurement verification) need to be repeated, S5 and S6, S7 (belonging to direct measurement once) and S8 (belonging to secondary measurement verification), and S9 is substantially the same as S3 and S4. That is, the addition of all raw materials adopts the mode of direct measurement once and secondary measurement verification, which can ensure the addition accuracy of raw materials and thus stabilize the reliability of the slurry quality.

[0117] After each of steps S4 - S9 is completed separately, the following steps may also be included:

[0118] Transport the raw materials in the pulping mixing tank to a vertical grinder. After grinding, transport the raw materials to a mixing filter for filtration, and then transport the filtered raw materials back to the pulping mixing tank. That is, after adding one raw material, it is first ground and filtered, and after filtration, it is transported back to the pulping mixing tank, and then the next raw material is added.

[0119] After step S10, the following steps may also be included: Use the third weighing unit to measure the total weight of the pulping mixing tank, then calculate the difference between the total weight and the preset qualified total weight of various raw materials required in the formula, and determine whether this difference is within the deviation range. If it is, the slurry is qualified; if not, the slurry is unqualified.

[0120] After each of steps S1 - S9 is completed separately, the following steps may also be included:

[0121] Open the heat transfer medium valve (a heat transfer medium valve is provided on the heat transfer medium pipeline 21) to allow the temperature regulating medium to enter the jacket layer of the pulping mixing tank to cool or heat the raw materials in the pulping mixing tank. Choose whether to cool or heat according to different product characteristics, weather, and temperature.

[0122] After the catalyst mixed slurry in the pulping mixing tank is transported to the next processing step, the weight of the pulping mixing tank returns to zero. Then, compressed air purging is started, and compressed air is introduced into the pipeline to purge the residual slurry in the entire conveying pipeline, completing the entire pulping process.

[0123] The catalyst slurry automatic preparation system designed by the present invention, by setting multiple weighing units, flow meters, grinding devices and filtering devices, is fully suitable for automatically preparing slurries of multiple varieties and characteristics, realizing automatic proportioning and feeding of various raw materials, with short pulping time, high production efficiency, reducing the labor intensity and health damage of operators, solving the problems of uniformity and repeatability in the pulping process (avoiding multiple additions of materials), enhancing the consistency of slurry products in different batches, and meeting the strict quality management specifications of the automotive industry; the equipment has a compact structure and fully automated operation, and can maximize the utilization of equipment production capacity requirements; it adopts a quick changeover design to meet the production of multiple catalysts; it has a unique on-line automatic cleaning design, reducing raw material residues and losses.

[0124] The catalyst slurry automatic preparation system designed by the present invention adopts a fast production process design for multiple batches and multiple specifications; the produced products have fast changeover, fast cleaning, high efficiency, low residual materials and low waste, meeting the automation, intelligence and refinement of the production of national VI catalysts; it is highly integrated and technological, with high-precision computer feedback of valves and instruments, facilitating the precise control of the process; it requires a small floor area, is flexible in layout, makes reasonable use of space, and greatly improves the space utilization rate in the factory building; it has flexible expandability, with reserved interfaces and rich functions; it has special component and structure designs, is convenient for maintenance and has a long service life; for the catalyst slurry automatic preparation system and preparation method designed by the present invention, the addition of all raw materials adopts a mode of direct metering once and secondary metering verification, which can ensure the accuracy of raw material addition and thus stabilize the reliability of slurry quality; the preparation system and preparation method designed by the present invention can produce a slurry with good fluidity, ensure the uniformity of the catalyst coating thickness, and at the same time the slurry has good anti-settling stability, avoiding stratification or particle aggregation during the coating process.

[0125] At the same time, due to the large change in the physical properties of the raw materials for national VI catalysts, the particle size of the materials is greatly reduced and the chemical activity of the catalyst increases, which causes greater harm to the health of operators. The fully automatic process of the present invention can bring more protection to the health of employees and the environment.

[0126] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An automatic catalyst slurry preparation system, characterized in that, It includes a raw material adding device, a pulping device and a circulating grinding device. The raw material adding device includes a pure water pipeline (14) for adding pure water raw materials and a first flowmeter (15) for measuring the adding amount of pure water raw materials flowing through it. The raw material adding device further includes a powder feeding tank (6) for adding powder raw materials and a first weighing unit (18) for weighing the powder feeding tank. The first weighing unit (18) is used to measure the adding amount of powder raw materials in the powder feeding tank. The raw material adding device further includes at least one liquid raw material storage tank for adding liquid raw materials, a first adding pump (8) arranged on the pipeline between the liquid raw material storage tank and the pulping mixing tank (1), and a second weighing unit (19) for weighing the liquid raw material storage tank. The second weighing unit (19) is used to measure the adding amount of liquid raw materials in the liquid raw material storage tank. The pulping device includes a pulping mixing tank (1) connected to the raw material adding device, a vertical powder adding machine (7) for conveying powder raw materials to the pulping mixing tank (1), a dust removal filter (10) connected to the pulping mixing tank (1), an in-tank stirrer (20) for stirring the raw materials in the pulping mixing tank (1), and a third weighing unit (17) for weighing the pulping mixing tank. The third weighing unit (17) is used to weigh the adding weight of the materials in the pulping mixing tank. The in-tank stirrer (20) includes a rotating paddle and a scraper (201) arranged on the rotating paddle. The scraper (201) can contact the inner wall of the pulping mixing tank (1), and the scraper (201) rotates with the rotation of the rotating paddle. The pulping device further includes a jacket layer (23) covering the outside of the pulping mixing tank (1) and a heat transfer medium pipeline (21) connected to the jacket layer (23). A temperature regulating medium is contained in the heat transfer medium pipeline (21), and the temperature regulating medium is one of cooling water, high-temperature water, high-temperature heat-conducting oil or steam. The circulating grinding device includes a first circulating pump (2) connected to the pulping mixing tank (1), a vertical grinding machine (3) connected to the first circulating pump (2), and a mixing filter (4) connected to both the pulping mixing tank (1) and the vertical grinding machine (3). The mixing filter (4) includes a housing (43), a stirring component (42) arranged in the housing (43), a filter mesh (44) arranged in the housing (43), and an end cover (45) detachably arranged at one end of the housing (43). The stirring component (42) is an integral structure, and the stirring component (42) is fixedly connected to the end cover (45). The housing (43) has a hollow cavity extending along its axis. The stirring component (42) extends along the axis of the hollow cavity. The filter mesh (44) is arranged around the inner side wall of the housing (43), and a plurality of filtering holes are distributed on the filter mesh (44). The housing (43) has a first feed inlet, a second feed inlet and a discharge outlet. The first feed inlet and the second feed inlet are both arranged at one end of the housing (43) away from the end cover (45). A material addition valve (41) is arranged at the second feed inlet. The discharge outlet is close to the end cover (45). A sampling valve (46) is arranged at one end of the housing (43) having the end cover (45). The raw material addition device further includes a third addition pump (5) for adding the precious metal solution raw material and a second flowmeter (16) for measuring the addition amount of the precious metal solution raw material flowing through it. The third addition pump (5) is connected to the feed inlet of the mixing filter (4), or the third addition pump (5) is connected to the pulping and mixing tank (1). The flow direction of the first material entering the housing through the first feed inlet is perpendicular to the flow direction of the second material entering the housing through the second feed inlet.

2. The catalyst slurry automatic preparation system according to claim 1, wherein The vertical powder adding machine (7) includes a powder adding assembly. The powder adding assembly includes a first driving mechanism (76), a hollow housing (70), a jacketed main shaft (71) arranged in the hollow housing (70), and a powder suction inlet (73) communicated with the hollow housing (70). A hollow structure is formed between the hollow housing (70) and the jacketed main shaft (71). The powder raw material in the powder feeding tank can enter the hollow structure through the powder suction inlet (73). The upper end of the jacketed main shaft (71) is connected to the first driving mechanism (76). Its lower end extends out of the hollow housing (70), and a stirring paddle (72) is fixedly arranged circumferentially at its lower end. A hood (80) with a hollow structure is arranged outside the hollow housing (70) so that the stirring paddle (72) is accommodated in the hood (80). Driven by the first driving mechanism (76), the jacketed main shaft (71) rotates, and then drives the stirring paddle (72) to rotate.

3. The catalyst slurry automatic preparation system according to claim 2, wherein The vertical powder adding machine (7) further includes a pneumatic lifting mechanism. The pneumatic lifting mechanism includes a lifting guide rail (79), an extension arm (77) connected to the lifting guide rail (79), and a second driving mechanism (78) connected to the extension arm (77). The first driving mechanism (76) is connected to the extension arm (77). The lifting guide rail (79) is arranged parallel to the hollow housing (70) and perpendicular to the extension arm (77). Driven by the second driving mechanism (78), the extension arm (77) moves along the length direction of the lifting guide rail (79), and then drives the powder adding assembly to move axially in the pulping and mixing tank (1) to approach or move away from it.

4. The catalyst slurry automatic preparation system according to claim 1, characterized in that The vertical grinding machine (3) includes a grinding assembly, a transmission mechanism, and a power mechanism (51). The grinding assembly includes a grinding chamber (31), a main shaft (38) capable of extending into the grinding chamber (31), a dispersion disk (32) arranged outside the main shaft (38), a plurality of baffle rings (35) arranged on the inner wall of the grinding chamber (31), a filter screen (33) arranged at the inner bottom of the grinding chamber (31), and an upper end cover (36) and a lower end cover (34) respectively arranged at the upper and lower ends of the grinding chamber (31). A material inlet and a material outlet are arranged on the grinding chamber (31). The material inlet is close to the upper part of the grinding chamber (31), and the material outlet is arranged at the bottom of the grinding chamber (31). The grinding chamber (31) has a hollow cavity. The dispersion disk (32) includes a plurality of grinding components arranged in sequence from top to bottom. A spacing is maintained between every two adjacent grinding components. The grinding components are arranged along the circumferential direction of the main shaft (38). A plurality of grinding beads are arranged in the cavity of the grinding chamber (31). Driven by the power mechanism (51), the transmission mechanism drives the main shaft (38) to rotate, so as to drive the grinding components to rotate, and further drive the grinding beads to move.

5. The catalyst slurry automatic preparation system according to claim 1, characterized in that, The liquid raw material storage tank includes a first liquid raw material storage tank (9) and a second liquid raw material storage tank (11). A first addition pump (8) is arranged on the pipeline between the first liquid raw material storage tank (9) and the pulp making and mixing tank (1). A second addition pump (12) is arranged on the pipeline between the second liquid raw material storage tank (11) and the pulp making and mixing tank (1). The catalyst slurry automatic preparation system further includes a compressed air automatic purging pipeline communicated with the pipeline in the circulating grinding device.

6. A preparation method of a catalyst slurry automatic preparation system according to any one of claims 1-5, characterized in that, It includes the following steps: S1. Set the corresponding qualified weights and qualified ranges of various raw materials required in the formula of the catalyst carrier; S2. Use the third weighing unit to measure the original weight of the pulp making and mixing tank; S3. Add a raw material into the pulp making and mixing tank, and measure the addition amount by the weighing unit or flow meter of the raw material addition device corresponding to this raw material; S4. Use the third weighing unit to measure the first weight of the pulp making and mixing tank containing the raw material in step S3; then calculate the difference between the first weight and the original weight, and judge whether this difference is within the qualified range of one of the raw materials. If so, execute step S5; if not, return to step S3; S5. Add another raw material other than the raw material added in step S3 into the pulp making and mixing tank through the corresponding raw material addition device, and the addition amount is measured by the weighing unit or flow meter of the corresponding raw material addition device; S6. Use the third weighing unit to measure the second weight of the pulp making and mixing tank containing the raw material, then calculate the difference between the second weight and the first weight, and judge whether this difference is within the qualified range of one of the raw materials. If so, execute step S7; if not, return to step S5; S7. Add another raw material other than the raw material added in step S3 and the raw material added in step S5 into the pulp making and mixing tank through the corresponding raw material addition device, and the addition amount is measured by the weighing unit or flow meter of the corresponding raw material addition device; S8. Measure the third weight of the pulping mixing tank containing the raw materials in step S7 using the third weighing unit, then calculate the difference between the third weight and the second weight, and determine whether this difference is within the qualified range of one of the raw materials. If so, execute step S9; if not, return to step S7; S9. Add another raw material other than the raw materials added in step S3, the raw materials added in step S5, and the raw materials added in step S7 to the pulping mixing tank. Then measure the fourth weight of the pulping mixing tank containing the raw materials using the third weighing unit, calculate the difference between the fourth weight and the third weight, and determine whether this difference is within the qualified range of one of the raw materials. S10. Continue to add any one of the remaining raw materials each time until all the raw materials are added to obtain the catalyst mixed slurry.

7. The preparation method of the catalyst slurry automatic preparation system according to claim 6, characterized in that, After each of steps S4 - S9 is completed separately, the following steps may further be included: Transport the raw materials in the pulping mixing tank to a vertical grinder. After grinding, transport the raw materials to a mixing filter for filtration, and then transport the filtered raw materials back to the pulping mixing tank.

8. The preparation method of the catalyst slurry automatic preparation system according to claim 6, characterized in that After step S10, the following steps may further be included: Measure the total weight of the pulping mixing tank using the third weighing unit, then calculate the difference between the total weight and the preset qualified total weight of the various raw materials required in the formula, and determine whether this difference is within the deviation range. If so, the slurry is qualified; if not, the slurry is unqualified.

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