Water-based quenching liquid for hollow wear-resistant cast ball, preparation method and application

Abstract

The invention discloses a water-based quenching liquid for a hollow wear-resistant cast ball, a preparation method and application, and the water-based quenching liquid comprises the following components by weight: 10-30% of a water-soluble polyether composition, 10-30% of a water-based quenching agent, 10-30% of a water-based quenching agent, and the balance of water. 10%-25% of an inorganic salt component; the nano-particle concentrated pre-dispersed slurry is a mixture of a dispersing agent, glycerol and nano-porous particles, the mass ratio of the dispersing agent to the glycerol to the nano-porous particles is 1: (4-6): (8-12), the nano-porous particles are mesoporous silica with the surface grafted with a temperature-sensitive polymer, the pore diameter is 2-10 nm, and the specific surface area is gt; 500 m / g; 0.5%-2% of a viscosity modifier; 1%-3% of an antirust agent; 0.1%-0.5% of a surfactant; and the balance of deionized water. The viscosity modifier and the porous nanoparticles are introduced into a hollow cast ball quenching liquid system for the first time, and the technical characteristic can effectively adjust the adhesiveness and fluidity of the quenching liquid on the surface of the cast ball, so that the cooling uniformity of the inner wall and the outer wall of the hollow cast ball is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of heat treatment, and particularly relates to a water-based quenching liquid for hollow wear-resistant cast ball, a preparation method and application. BACKGROUND

[0002] Quenching is the most important process in the heat treatment process. Quenching is a process of heating steel to above the critical point, keeping for a certain time, and rapidly cooling in a quenching medium to obtain a martensite structure. The purpose of quenching is to increase the hardness and wear resistance of steel, and to obtain good comprehensive mechanical properties of parts. Common quenching media include salt water, water, mineral oil, air, etc.

[0003] Ball mills are widely used in the cement, power, mineral processing, building materials and other industries. As the grinding medium in the ball mill, the grinding ball needs to have high wear resistance and high toughness. During quenching, the cooling speed needs to be controlled within a reasonable range, otherwise the core and the working surface will have uneven quenching hardness. Especially for hollow grinding balls with a thickness of more than 15 cm, if the cooling speed is too fast, the core cannot effectively dissipate heat in a short time, while the working surface is rapidly cooled by the quenching agent, resulting in a brittle skin phenomenon on the working surface, and even the brittle skin phenomenon, the core cannot release stress and cannot guarantee the hardness, resulting in that the wear resistance and hardness of the grinding ball cannot be guaranteed.

[0004] Through retrieval, it is found that:

[0005] CN108588357B discloses an environmentally friendly water-based quenching liquid composition and its preparation and use method. The composition raw materials are water-soluble low-molecular polyether composition, antirust agent, bactericide, pH stabilizer, complexing agent, defoaming agent and water. The environmentally friendly water-based quenching liquid composition of the application mainly contains two water-soluble low-molecular polyether compositions, and does not contain harmful components such as boron, secondary amine, heavy metal, inorganic salt, diethanolamine and triethanolamine to human body and environment, which is safe and environmentally friendly.

[0006] CN114480791A discloses a quenching heat treatment process for wear-resistant cast ball and the wear-resistant cast ball. The quenching heat treatment process for the wear-resistant cast ball comprises the following steps: after the wear-resistant cast ball is heated to an austenitizing temperature, the wear-resistant cast ball is immersed in a water-based quenching liquid for quenching and cooling; wherein the water-based quenching liquid is a solution prepared by mixing ZFQ-A type water-based quenching agent stock solution and water at a ratio of 1:4-6.

[0007] CN101660027B relates to a water-soluble polyether quenching medium for quenching of metal materials, the components and contents thereof are as follows in percentage by weight: water-soluble polyether 1-30%, antirust agent 0.1-1.0%, defoaming agent 100-500ppm, composite bactericide 0.1-1.0%, pH value regulator 0.2-2%, and the balance is water; the water-soluble polyether is a condensate of ethylene oxide and propylene oxide, and the number average molecular weight Mn is less than 20000.

[0008] In summary, the above-mentioned water-based quenching liquid can be applied to the quenching of cast balls, but it cannot complete the uniformity of the inner and outer quenching effect for the hollow structure cast ball, so that the product quality problem of the cast ball occurs. SUMMARY

[0009] The technical problem to be solved by the present application is how to solve the product quality problem of hardness, structure and wear resistance caused by uneven cooling inside and outside of the hollow wear-resistant cast ball.

[0010] In order to solve the above technical problems, the inventors have summarized and obtained the technical scheme of the present application through practice, and the present application adopts the following technical scheme:

[0011] A water-based quenching liquid for a hollow wear-resistant cast ball, consisting of the following components in percentage by weight:

[0012] Water-soluble polyether composition 10%-30%;

[0013] Inorganic salt component 10%-25%;

[0014] Nanoparticle concentrated pre-dispersed slurry 1%-5%, the nanoparticle concentrated pre-dispersed slurry is a mixture of dispersant, glycerol and nanoporous particles, the mass ratio of dispersant, glycerol and nanoporous particles is 1:(4-6):(8-12), the nanoporous particles are mesoporous silica with surface grafted temperature-sensitive polymer, the pore size is 2-10nm, and the specific surface area is >500m² / g;

[0015] Viscosity regulator 0.5%-2%;

[0016] Antirust agent 1%-3%;

[0017] Surfactant 0.1%-0.5%;

[0018] The balance is deionized water.

[0019] Preferably, the water-soluble polyether composition comprises polyether with a molecular weight of 20000-30000 and polyether with a molecular weight of 5000-15000, and the weight ratio of the two is 1:1-1:3.

[0020] Preferably, the inorganic salt component is a mixture of sodium chloride, potassium chloride and sodium silicate in a weight ratio of (1-3):(1-2):(1-2).

[0021] Preferably, the viscosity regulator is a mixture of methyl cellulose and sodium alginate in a weight ratio of 1:1 to 1:3.

[0022] The rust inhibitor is a mixture of triethanolamine, sodium benzoate and boric acid in a weight ratio of 2:1:1.

[0023] The surfactant is polyvinylpyrrolidone.

[0024] Preferably, the preparation of the nanoporous particles is as follows:

[0025] Step 1: acrylation of the end groups of Pluronic F127

[0026] Dissolve 5 g of Pluronic F127 in 100 mL of anhydrous dichloromethane, add 2 mL of triethylamine, and cool in an ice water bath;

[0027] Slowly add 1.5 mL of acryloyl chloride dissolved in 20 mL of dichloromethane under nitrogen protection, and after the addition is complete, move to room temperature and react for 12 hours;

[0028] After the reaction is complete, filter out the triethylamine salt, wash the organic phase with saturated NaHCO3 solution, and then wash with deionized water three times;

[0029] Dry the organic phase with anhydrous magnesium sulfate, filter, and then remove the solvent by rotary evaporation to obtain acrylated Pluronic F127, which is stored in the refrigerator for later use;

[0030] Step 2: amination of mesoporous silica nanoparticles

[0031] Disperse 1 g of mesoporous silica nanoparticles (pore size 8-10 nm, specific surface area >600 m² / g) in 100 mL of anhydrous toluene, add 1 mL of 3-aminopropyltriethoxysilane, and reflux under nitrogen protection for 12 hours;

[0032] After the reaction is complete, wash with toluene and ethanol three times by centrifugation to obtain aminated mesoporous silica nanoparticles, which are dried under vacuum;

[0033] Step 3: photo-induced grafting and crosslinking

[0034] Amino-functionalized mesoporous silica nanoparticles (0.5 g) were dispersed in 50 mL of deionized water, and 0.5 g of acrylated Pluronic F127, 0.05 g of N,N'-methylenebisacrylamide, and 0.02 g of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone were added;

[0035] The mixture was ultrasonically dispersed for 30 minutes, and then irradiated with ultraviolet light (365 nm, intensity 10 mW / cm2) for 2 hours under nitrogen protection while slowly stirring;

[0036] After the reaction was completed, the product was washed with deionized water by centrifugation for 5 times to remove the ungrafted monomers and homopolymers;

[0037] The product was vacuum dried at 40°C to obtain the final temperature-responsive nanoporous particles.

[0038] The preferred method is as follows:

[0039] Step 1, preparation of nanoparticle concentrated pre-dispersion slurry

[0040] In a beaker, 840 g of deionized water and 10 g of dispersant BYK-190 were added, and stirred at 500 rpm for 5 minutes to completely dissolve the dispersant;

[0041] 100 g of nanoparticle dry powder was slowly added while gradually increasing the stirring speed to 2000 rpm, and the stirring was continued at this speed for 30 minutes to obtain a milky white primary dispersion;

[0042] The primary dispersion was transferred to the working tank of a high-shear disperser;

[0043] High-speed shearing was performed at a speed of 10,000 rpm for 15-20 minutes under ice water bath cooling (to prevent overheating);

[0044] The high-shear treated dispersion was transferred to a glass beaker and ultrasonically treated in an ice water bath for 10 minutes;

[0045] 50 g of glycerol was added to the dispersed slurry, and stirred at 500 rpm for 10 minutes to mix evenly;

[0046] Step 2, adding the pre-dispersion slurry to the main system of the quenching liquid

[0047] About 600 kg of deionized water was added to a clean batching kettle;

[0048] The stirring was started, and the speed was controlled at 50-100 rpm;

[0049] 200 kg of water-soluble polyether composition was slowly added, and the feeding time was not less than 30 minutes to ensure complete dissolution;

[0050] Add 100 kg of inorganic salt component, 20 kg of anti-rust agent in turn, each material is added for not less than 10 minutes, ensure complete dissolution and mixing;

[0051] Dilute 25 kg of nano particle pre-dispersed slurry with the remaining deionized water (about 50 kg) by one time, and stir gently;

[0052] Adjust the stirring speed of the ingredient kettle to low speed of 30-50 rpm;

[0053] Slowly add the diluted slurry into the base liquid in a linear stream, and the feeding point is located at the center of the liquid vortex;

[0054] After all the materials are added, add 5 kg of viscosity regulator;

[0055] Increase the stirring speed to 70-100 rpm, and continue stirring for 2-4 hours to ensure that the system is completely uniform;

[0056] Make up to 1000 kg of total weight with deionized water;

[0057] Turn off the stirring, and let the quenching liquid stand and mature for at least 12 hours to allow the components to fully interact and reach a stable state.

[0058] The application of a water-based quenching liquid for hollow wear-resistant cast balls, the steps are as follows:

[0059] Step 1, place the hollow wear-resistant cast ball into the quenching furnace, heat the hollow wear-resistant cast ball to 850-950℃, and keep it for 1-3 hours to achieve austenitization, then take it out and temporarily hoist it by the lifter in the mobile enclosure, adjust the mobile enclosure to the top of the quenching tank, and put the hollow wear-resistant cast ball into the quenching tank;

[0060] The right side of the quenching furnace is of open-close structure for the entry and exit of the hollow wear-resistant cast ball, and the left side of the mobile enclosure is of open-close structure for the entry and sealing of the hollow wear-resistant cast ball;

[0061] The lifter is arranged at the top of the mobile enclosure;

[0062] Step 2, the bottom of the quenching tank is provided with a support roller and a cooling ring inserted into the interior of the hollow wear-resistant cast ball, the support roller is used to support the hollow wear-resistant cast ball, and the cooling ring is provided with a liquid outlet;

[0063] The quenching tank is further provided with a quenching liquid circulating member, a driving structure and a liquid supply structure, the liquid supply structure supplies liquid to the cooling ring, and the driving structure drives the cooling ring to move on the inner side of the hollow wear-resistant cast ball;

[0064] The hollow wear-resistant steel ball is placed in a water-based quenching liquid with a temperature of 20-50 DEG C, and during the placing process, the quenching liquid is heated to form steam, the closed cover is moved to condense the steam and return it to the quenching tank, the cooling ring is inserted into the hollow wear-resistant cast ball, the liquid supply structure supplies liquid to the inside of the cooling ring, and the driving structure drives the cooling ring to continuously supply liquid to the hollow wear-resistant cast ball;

[0065] Step 3: when the surface temperature of the hollow cast ball is reduced to 200-300 DEG C, the hollow cast ball is lifted away from the quenching tank;

[0066] Step 4: the lifted hollow wear-resistant cast ball is tempered at 160-250 DEG C for 1-3 hours.

[0067] Preferably, the driving structure comprises a motor and a transmission gear, the output end of the motor is provided with a bevel gear, the transmission gear is provided with two gears which are respectively engaged on the upper and lower sides of the bevel gear, the transmission gear is rotatably installed at the bottom of the quenching tank, the inner side of the transmission gear is inserted with a transmission rod, the transmission rod between the transmission gears is provided with a transmission gear sleeve, the two ends of the transmission gear sleeve are provided with transmission gear surfaces, one of the transmission gear surfaces is engaged with the corresponding transmission gear, the cooling ring is transmissionally matched with the transmission rod, the quenching tank is provided with a guide rod, the guide rod is slidingly matched with the cooling ring, the bottom of the quenching tank is provided with a guide seat, the transmission rod is inserted into the guide seat, and the guide seat is provided with a switching member for switching the axial position of the transmission rod;

[0068] The guide rod is inserted with two connecting discs which are adjustable in the axial position of the guide rod, the connecting discs are provided with elastic bodies which are used for acting on the cooling ring.

[0069] Preferably, the liquid supply structure comprises a circulating pump, the circulating pump is connected with a filter through a pipeline, the filter comprises a box body, the top of the box body is provided with a stepping motor, the output end of the stepping motor is provided with a transmission gear set for driving the filter element in the box body to rotate by a set angle, the filter element is provided with a plurality of circumferentially distributed filter portions, the filter portion comprises two side plate bodies, a filter screen distributed between the two side plate bodies and an opening and closing plate, the filter screen is arranged towards the liquid inlet of the box body, the opening and closing plate is symmetrically distributed with two groups and is rotatably installed on the side of the side plate body away from the liquid inlet, a torsional spring is arranged between the opening and closing plate and the side plate body, the inside of the filter element is provided with an inner support body, the inner support body is fixed in the inside of the box body, the inner support body is provided with a guide half ring for restricting the opening of the opening and closing plate away from the liquid inlet.

[0070] Preferably, the bottom of the filter element is provided with an upper discharge gap, the side of the box body away from the liquid inlet is provided with a lower discharge gap, the upper discharge gap and the lower discharge gap can be overlapped after the filter element rotates by a certain angle, and the liquid inlet of the box body and the inside of the filter element are both provided with pressure sensors.

[0071] Compared with the prior art, the present application has the following beneficial effects:

[0072] 1. The present application first introduces viscosity regulators and porous nanoparticles into the hollow ball quenching liquid system, which can effectively regulate the adhesion and flowability of the quenching liquid on the surface of the cast ball, thereby improving the cooling uniformity of the inner and outer walls of the hollow cast ball.

[0073] 2. The present application introduces temperature-responsive nanoporous particles into the quenching liquid, which have reversible characteristics. The steam film generated during the quenching process is used as a trigger signal to drive the nanoporous channel to open and close through the reversible "stretching-collapse" of the polymer chain, forming a "steam micro-pump" that is automatically synchronized with the cooling process. By adjusting the polymer structure and grafting density, the dramatic collapse point of the PPO block is at a high temperature of about 300℃, which can be achieved by introducing strong hydrophobic units or increasing the crosslinking density. During the high-temperature stage (>300℃), the cast ball is immersed instantaneously, and a stable steam film is generated at the interface. The extremely high temperature in the steam film makes the PPO block extremely hydrophobic and collapses dramatically, like "pulling the curtain", pulling the polymer brush away from the channel wall and opening the channel. During the medium and low temperature stage (<300℃), the steam film breaks, and the liquid directly contacts the high-temperature surface (but the temperature has decreased). At this time, the PPO block restores its hydrophilicity, and the polymer brush rehydrates and stretches due to the hydrophilicity of the PEO block, closing the channel and slowing down the cooling speed at low temperature.

[0074] 3. The present application actively supplies liquid to the inside of the hollow ball to avoid the continuous rise of the internal quenching liquid temperature and to avoid the difficulty of increasing the consistency of the internal and external cooling temperatures. In order to avoid carrying impurities in the quenching liquid delivered to the inside of the cast ball, a filtering structure is added, which can determine whether it is blocked according to the internal and external pressure difference. If the filter core is blocked, the motor will automatically rotate the filter core by a certain angle, thereby actively replacing the corresponding filter screen to continuously filter the impurities, which are discharged when the filtered impurities coincide with the upper and lower discharge openings. BRIEF DESCRIPTION OF DRAWINGS

[0075] Figure 1 The product index graph of the water-based quenching liquid of the present application.

[0076] Figure 2 The product quenching curve graph of the water-based quenching liquid of the present application.

[0077] Figure 3 The quenching furnace and quenching tank position distribution graph of the water-based quenching liquid of the present application in application.

[0078] Figure 4 The structure distribution graph of the quenching tank of the present application.

[0079] Figure 5This is a diagram showing the connection relationship between the cooling ring and the transmission rod of the present invention.

[0080] Figure 6 This is a diagram showing the positional distribution of the switching component and transmission rod of the present invention.

[0081] Figure 7 This is a vertical cross-sectional view of the internal structure of the filter of the present invention.

[0082] Figure 8 This is a cross-sectional view of the internal structure of the filter of the present invention. Detailed Implementation

[0083] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0084] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0085] Example 1

[0086] like Figure 1 and Figure 2 As shown, a water-based quenching fluid for hollow wear-resistant cast balls is composed of the following components by weight percentage:

[0087] Water-soluble polyether composition 10%~30%;

[0088] Inorganic salt components: 10%~25%;

[0089] The nanoparticle concentrated pre-dispersed slurry is 1%~5%, which is a mixture of dispersant, glycerol and nanoporous particles. The mass ratio of dispersant, glycerol and nanoporous particles is 1:(4-6):(8-12). The nanoporous particles are mesoporous silica with surface grafted thermosensitive polymer, with a pore size of 2-10nm and a specific surface area >500m² / g.

[0090] Viscosity modifier 0.5%~2%;

[0091] Rust inhibitor 1%~3%;

[0092] Surfactant 0.1%~0.5%;

[0093] The remainder is deionized water.

[0094] Preferably, the water-soluble polyether composition comprises a polyether having a molecular weight of 20,000-30,000 and a polyether having a molecular weight of 5,000-15,000, both in a weight ratio of 1:1 to 1:3.

[0095] Preferably, the inorganic salt component is a mixture selected from sodium chloride, potassium chloride and sodium silicate, in a weight ratio of (1-3):(1-2):(1-2).

[0096] Preferably, the viscosity regulator is a mixture of methyl cellulose and sodium alginate, both in a mixing weight ratio of 1:1 to 1:3.

[0097] The rust inhibitor is selected from a complex rust inhibitor of triethanolamine, sodium benzoate and boric acid, in a weight ratio of 2:1:1.

[0098] The surfactant is polyvinylpyrrolidone.

[0099] The preparation steps of the nanoporous particles are as follows:

[0100] Step 1: acrylation of the end groups of Pluronic F127

[0101] Dissolve 5 g of Pluronic F127 in 100 mL of anhydrous dichloromethane, add 2 mL of triethylamine, and cool in an ice water bath;

[0102] Slowly add 1.5 mL of acryloyl chloride dissolved in 20 mL of dichloromethane under nitrogen protection, and after the addition is complete, move to room temperature and react for 12 hours;

[0103] After the reaction is complete, filter out the triethylamine salt, wash the organic phase with a saturated NaHCO3 solution, and then wash with deionized water three times;

[0104] Dry the organic phase with anhydrous magnesium sulfate, filter, and then remove the solvent by rotary evaporation to obtain acrylated Pluronic F127, which is stored in a refrigerator for later use;

[0105] Step 2: amination of mesoporous silica nanoparticles

[0106] Disperse 1 g of mesoporous silica nanoparticles (pore size 8-10 nm, specific surface area >600 m² / g) in 100 mL of anhydrous toluene, add 1 mL of 3-aminopropyltriethoxysilane, and reflux under nitrogen protection for 12 hours;

[0107] After the reaction is complete, wash with toluene and ethanol by centrifugation three times to obtain aminated mesoporous silica nanoparticles, which are dried under vacuum;

[0108] Step 3: photo-induced grafting and cross-linking

[0109] 0.5 g of aminofunctionalized mesoporous silica nanoparticles were dispersed in 50 mL of deionized water, 0.5 g of acrylated Pluronic F127, 0.05 g of N,N'-methylenebisacrylamide and 0.02 g of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone were added;

[0110] The mixture was ultrasonically dispersed for 30 minutes, and then irradiated with ultraviolet light (365 nm, intensity 10 mW / cm2) for 2 hours under nitrogen protection while slowly stirring;

[0111] After the reaction was completed, the product was centrifugally washed with deionized water for 5 times to remove the ungrafted monomers and homopolymers;

[0112] The product was vacuum dried at 40°C to obtain the final temperature-responsive nanoporous particles.

[0113] The preparation method of the above water-based quenching liquid is as follows:

[0114] Step 1, preparation of nanoparticle concentrated pre-dispersion slurry

[0115] In a beaker, 840 g of deionized water and 10 g of dispersant BYK-190 were added, and stirred at 500 rpm for 5 minutes to completely dissolve the dispersant;

[0116] 100 g of nanoparticle dry powder was slowly added, and the stirring speed was gradually increased to 2000 rpm, and the stirring was continued at this speed for 30 minutes to obtain a milky white primary dispersion;

[0117] The primary dispersion was transferred to the working tank of a high shear disperser;

[0118] High-speed shearing dispersion was carried out at a speed of 10000 rpm for 15-20 minutes under ice water bath cooling condition;

[0119] The high-shear treated dispersion was transferred into a glass beaker and ultrasonically treated in an ice water bath for 10 minutes;

[0120] 50 g of glycerol was added to the dispersed slurry, and stirred at 500 rpm for 10 minutes to mix uniformly;

[0121] Step 2, adding the pre-dispersion slurry to the quenching liquid main system

[0122] 600 kg of deionized water was added to a clean batching kettle;

[0123] The stirring was started, and the speed was controlled at 50-100 rpm;

[0124] Slowly add 200 kg of water-soluble polyether composition, the feeding time is not less than 30 minutes, to ensure complete dissolution;

[0125] Add 100 kg of inorganic salt component, 20 kg of anti-rust agent in turn, each material is added for not less than 10 minutes, to ensure complete dissolution and mixing;

[0126] Dilute 25 kg of nano particle pre-dispersed slurry with the remaining deionized water by one time, and stir gently;

[0127] Adjust the stirring speed of the batching kettle to a low speed of 30-50 rpm;

[0128] Slowly add the diluted slurry into the base liquid in a linear stream, and the feeding point is located at the center of the vortex of the liquid surface;

[0129] After all the materials are added, add 5 kg of viscosity regulator;

[0130] Increase the stirring speed to 70-100 rpm, and continue stirring for 2-4 hours to ensure complete uniformity of the system;

[0131] Make up to 1000 kg of total weight with deionized water;

[0132] Turn off the stirring, and let the quenching liquid stand and mature for at least 12 hours to allow the components to fully interact and reach a stable state.

[0133] The parameters of the obtained quenching liquid are as shown in Figure 1 , and the cooling curve is as shown in Figure 2 .

[0134] Example 2

[0135] As shown in Figures 3 to 8 , the application of a water-based quenching liquid for a hollow wear-resistant cast ball is as follows:

[0136] Step 1, place the hollow wear-resistant cast ball 300 into the quenching furnace 200, heat the hollow wear-resistant cast ball 300 to 850-950℃, and keep it for 1-3 hours to achieve austenitization, then take it out and temporarily hoist it by the lifter 101 in the mobile enclosure 100, adjust the mobile enclosure 100 to the top of the quenching tank 400, and put the hollow wear-resistant cast ball 300 into the quenching tank 400;

[0137] The right side of the quenching furnace 200 is of an open-close structure for the entry and exit of the hollow wear-resistant cast ball 300, and the left side of the mobile enclosure 100 is of an open-close structure to facilitate the entry of the hollow wear-resistant cast ball 300 and the subsequent sealing operation;

[0138] The lifter 101 is arranged at the top of the mobile enclosure 100;

[0139] The bottom of the quenching tank 400 is provided with a supporting roller 401 for supporting the hollow wear-resistant casting ball 300 and a cooling ring 402 inserted into the hollow wear-resistant casting ball 300, and the cooling ring 402 is provided with a liquid outlet;

[0140] The quenching tank 400 is further provided with a quenching liquid circulating member, a driving structure and a liquid supply structure. The liquid supply structure supplies liquid to the cooling ring 402, and the driving structure drives the cooling ring 402 to move inside the hollow wear-resistant casting ball 300.

[0141] The hollow wear-resistant steel ball is cooled in water-based quenching liquid with a temperature of 20-50°C. During the cooling process, the quenching liquid is heated to form steam. The moving sealing cover 100 condenses the steam and returns it to the quenching tank 400. The cooling ring 402 is inserted into the hollow wear-resistant casting ball 300, the liquid supply structure supplies liquid to the inside of the cooling ring 402, and the driving structure drives the cooling ring 402 to continuously supply liquid to the hollow wear-resistant casting ball 300.

[0142] Step 3: When the surface temperature of the hollow casting ball decreases to 200-300°C, it is lifted away from the quenching tank 400.

[0143] Step 4: The lifted hollow wear-resistant casting ball 300 is tempered at 160-250°C for 1-3 hours.

[0144] The driving structure includes a motor 403 and a transmission gear 404. The output end of the motor 403 is provided with a bevel gear 405. The transmission gear 404 is provided with two bevel gears meshing on the upper and lower sides of the bevel gear 405. The transmission gear 404 is rotatably installed at the bottom of the quenching tank 400, and the inside of the transmission gear 404 is inserted with a transmission rod 406. The transmission rod 406 located between the transmission gears 404 is provided with a transmission gear sleeve 407. The two ends of the transmission gear sleeve 407 are provided with transmission gear surfaces. One of the transmission gear surfaces is meshed with the corresponding transmission gear 404. The cooling ring 402 is transmissionally matched with the transmission rod 406. The quenching tank 400 is provided with a guide rod 420. The guide rod 420 is slidingly matched with the cooling ring 402. The bottom of the quenching tank 400 is provided with a guide seat 408. The transmission rod 406 is inserted into the guide seat 408. The guide seat 408 is provided with a switching member 409 for switching the axial position of the transmission rod 406.

[0145] The guide rod 420 is inserted with two connecting discs 421. The two connecting discs 421 are adjustable in the axial position of the guide rod 420. The connecting disc 421 is provided with an elastic body 422. The elastic body 422 is used to act on the cooling ring 402.

[0146] During the cooling operation, the connecting disc 421 is adjusted to the size of the inner cavity of the hollow wear-resistant cast ball 300, that is, the running path can completely cover the inner cavity area, and the connecting disc 421 and the cooling ring 402 can enter the interior of the hollow wear-resistant cast ball;

[0147] During the cooling operation, the motor 403 drives the two transmission gears 404 to rotate through the bevel gear 405. Initially, the transmission sleeve 407 is meshed with one of the transmission gears 404 to drive the transmission rod 406 to rotate. When the connecting disc 421 reaches the elastic body 422, the cooling ring 402 forces the transmission rod 406 to adjust the axial position. The switching piece 409 is composed of an elastic pressing piece and can switch positions in the two constraint ring grooves outside the transmission rod 406, thereby causing the transmission rod 406 to adjust the position, and then the transmission sleeve 407 is meshed with the other transmission gear 404, thereby realizing reverse operation. The circulation of the inner cavity is moved and cooled, and the pipeline on the cooling ring 402 in the quenching tank 400 is a coil pipe that can automatically roll and stretch, that is, a pipeline inserted into the reel. It is a mature product that avoids damage to the hollow wear-resistant cast ball 200 in contact with high-temperature state.

[0148] After the quenching liquid is used for multiple times, metal layers will fall off from the surface of the cast ball during quenching, thereby forming particulate impurities that need to be filtered. However, the existing filtering is centralized after a certain number of times or completed online. However, the filter will be blocked during operation, and it is difficult to accurately determine whether the filter is blocked, thereby easily causing the quenching liquid to be unable to circulate cleanly and effectively, thereby affecting the use effect of the quenching liquid.

[0149] The liquid supply structure includes a circulating pump 410 connected with a filter 411 through a pipeline. The filter 411 includes a box body. A stepper motor 4112 is arranged at the top of the box body. The output end of the stepper motor 4112 is provided with a transmission gear set to drive the filter core 4111 in the box body to rotate by a set angle. A plurality of circumferentially distributed filter portions are arranged on the filter core 4111. The width of the filter portion is equal to the spacing between the filter portions. The filter portion includes two side plate bodies 4113, a filter screen 4114 distributed between the two side plate bodies 4113, and an opening and closing plate 4115. The filter screen 4114 is arranged towards the liquid inlet of the box body. The opening and closing plate 4115 is symmetrically distributed in two groups and is rotatably arranged on the side of the side plate body 4113 away from the liquid inlet. A torsional spring is arranged between the opening and closing plate 4115 and the side plate body 4113. An inner support body 4116 is arranged on the inside of the filter core 4111. The inner support body 4116 is fixed to the inside of the box body. An inner guide half ring 4117 is arranged on the inner support body 4116. The inner guide half ring 4117 is used to constrain the opening and closing of the opening and closing plate 4115 away from the liquid inlet.

[0150] The bottom of the filter core 4111 is provided with an upper discharge gap 4119, the side of the box body away from the liquid inlet is provided with a lower discharge gap 4118, the upper discharge gap 4119 and the lower discharge gap 4118 can coincide after the filter core 4111 rotates by a certain angle, and the liquid inlet of the box body and the inner side of the filter core 4111 are both provided with pressure sensors.

[0151] During normal quenching liquid circulation operation, the quenching liquid will open the opening and closing plate 4115 against the torsional spring through the conveying action of the circulation pump 410, and the quenching liquid is discharged from the bottom liquid outlet pipe after being filtered by the filter screen, and the quenching liquid is continuously conveyed in the cooling ring 402.

[0152] When blockage occurs, that is, the pressure difference between the inside and outside of the filter core 410 detected by the pressure sensor exceeds the set pressure difference range, the system determines that blockage occurs, the stepping motor 4112 drives the filter core 4111 to rotate by a set angle, and switches to another filtering part, and since the guiding half ring 4117 is present inside, it will restrict the opening of the opening and closing plate 4115 at the non-liquid inlet, but at this time, the remaining filtering parts are in a sealed state with the box body, and a cleaning structure can be separately provided on the side away from the liquid inlet to clean the filter screen, and the metal particles after cleaning will enter the upper discharge gap 4119 and the lower discharge gap 4118 into the collection box installed at the bottom in advance.

[0153] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. The alternatives can be partial structure, device, method step alternatives, or complete technical solutions. According to the technical solutions and inventive concepts of the present application, equivalent replacements or changes are covered within the protection scope of the present application.

Claims

1. A water-based quenching fluid for hollow wear-resistant cast balls, characterized in that, By weight percentage, it consists of the following components: Water-soluble polyether composition 10%~30%; Inorganic salt components: 10%~25%; The nanoparticle concentrated pre-dispersed slurry is 1%~5%, which is a mixture of dispersant, glycerol and nanoporous particles. The mass ratio of dispersant, glycerol and nanoporous particles is 1:(4-6):(8-12). The nanoporous particles are mesoporous silica with surface grafted thermosensitive polymer, with a pore size of 2-10nm and a specific surface area >500m² / g. Viscosity modifier 0.5%~2%; Rust inhibitor 1%~3%; Surfactant 0.1%~0.5%; The remainder is deionized water.

2. The water-based quenching fluid for hollow wear-resistant cast balls according to claim 1, characterized in that, The water-soluble polyether composition comprises a polyether with a molecular weight of 20,000-30,000 and a polyether with a molecular weight of 5,000-15,000, in a weight ratio of 1:1 to 1:

3.

3. The water-based quenching fluid for hollow wear-resistant cast balls according to claim 1, characterized in that, The inorganic salt component is a mixture selected from sodium chloride, potassium chloride and sodium silicate, in a weight ratio of (1-3):(1-2):(1-2).

4. The water-based quenching fluid for hollow wear-resistant cast balls according to claim 1, characterized in that, The viscosity modifier is a mixture of methylcellulose and sodium alginate, with a weight ratio of 1:1 to 1:

3. The rust inhibitor is a composite rust inhibitor composed of triethanolamine, sodium benzoate and boric acid, with a weight ratio of 2:1:

1. The surfactant is polyvinylpyrrolidone.

5. The water-based quenching fluid for hollow wear-resistant cast balls according to claim 1, characterized in that, The preparation steps of the nanoporous particles are as follows: Step 1: Acrylonitrification of Pluronic F127 end groups Dissolve 5g of Pluronic F127 in 100mL of anhydrous dichloromethane, add 2mL of triethylamine, and cool in an ice-water bath. Under nitrogen protection, 1.5 mL of acryloyl chloride solution in 20 mL of dichloromethane was slowly added dropwise. After the addition was complete, the mixture was moved to room temperature and reacted for 12 hours. After the reaction was completed, the triethylamine salt was removed by filtration, the organic phase was washed with saturated NaHCO3 solution, and then washed three times with deionized water. The organic phase was dried with anhydrous magnesium sulfate, filtered, and the solvent was removed by rotary evaporation to obtain acrylated Pluronic F127. The product was stored in a refrigerator for later use. Step 2: Amination of mesoporous silica nanoparticles 1 g of mesoporous silica nanoparticles (pore size 8-10 nm, specific surface area >600 m² / g) were dispersed in 100 mL of anhydrous toluene, and 1 mL of 3-aminopropyltriethoxysilane was added. The mixture was refluxed for 12 hours under nitrogen protection. After the reaction was completed, the nanoparticles were washed three times by centrifugation with toluene and ethanol to obtain aminated mesoporous silica nanoparticles, which were then dried under vacuum. Step 3: Photoinitiated grafting and crosslinking 0.5g of aminated mesoporous silica nanoparticles were dispersed in 50mL of deionized water, and 0.5g of acrylated Pluronic F127, 0.05g of N,N'-methylenebisacrylamide and 0.02g of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylphenylacetone were added. Disperse ultrasonically for 30 minutes, then irradiate with ultraviolet light (365nm, intensity 10mW / cm²) for 2 hours under nitrogen protection, while stirring slowly. After the reaction was completed, the product was washed five times by centrifugation with deionized water to remove ungrafted monomers and homopolymers. The product was vacuum dried at 40°C to obtain the final reversible temperature-responsive nanoporous particles.

6. The method for preparing a water-based quenching fluid for hollow wear-resistant cast balls according to claim 1, characterized in that, The steps are as follows: Step 1: Preparation of concentrated pre-dispersed nanoparticle slurry Add 840g of deionized water and 10g of dispersant BYK-190 to a beaker, and stir at 500 rpm for 5 minutes to completely dissolve the dispersant; Slowly add 100g of dry nanoparticle powder while gradually increasing the stirring speed to 2000 rpm. Continue stirring at this speed for 30 minutes to obtain a milky white initial dispersion. Transfer the initial dispersion to the working tank of the high-shear disperser; Under ice water bath cooling (to prevent overheating), shear and disperse at high speed of 10,000 rpm for 15-20 minutes; The high-shear dispersion was transferred into a glass beaker and sonicated in an ice-water bath for 10 minutes. Add 50g of glycerol to the dispersed slurry and stir at 500 rpm for 10 minutes until well mixed. Step 2: Add the pre-dispersed slurry to the main quenching fluid system. Add approximately 600 kg of deionized water to a clean mixing vessel; Start the mixer and control the speed at 50-100 rpm; Slowly add 200 kg of water-soluble polyether composition over a period of no less than 30 minutes to ensure complete dissolution. Add 100 kg of inorganic salt components and 20 kg of rust inhibitor sequentially, with an interval of no less than 10 minutes between each material to ensure complete dissolution and mixing; Dilute 25 kg of pre-dispersed nanoparticle slurry with the remaining deionized water by half and stir gently. Adjust the stirring speed of the mixing tank to a low speed of 30-50 rpm; The diluted slurry is slowly and in a linear flow into the base liquid, with the addition point located at the center of the vortex on the liquid surface; After all the materials have been added, add 5 kg of viscosity modifier; Increase the stirring speed to 70-100 rpm and continue stirring for 2-4 hours to ensure the system is completely homogeneous; Add deionized water to bring the total weight to 1000kg; Turn off the stirring and let the quenching liquid stand and mature for at least 12 hours to allow the components to fully interact and reach a stable state.

7. The application of a water-based quenching fluid for hollow wear-resistant cast balls, characterized in that, The steps are as follows: Step 1: Place the hollow wear-resistant cast ball (300) into the quenching furnace (200), heat the hollow wear-resistant cast ball (300) to 850-950℃, keep it at that temperature for 1-3 hours to achieve austenitization, take it out and put it into the movable closed cover (100), and temporarily lift it by the lifter (101) in the movable closed cover (100), adjust the movable closed cover (100) to the top of the quenching tank (400), and put the hollow wear-resistant cast ball (300) into the quenching tank (400); The right side of the quenching furnace (200) is an openable and closable structure for the hollow wear-resistant cast balls (300) to enter and exit, and the left side of the movable closed cover (100) is an openable and closable structure to facilitate the entry of the hollow wear-resistant cast balls (300) and the sealing operation after entry. The lifting device (101) is installed on top of the movable enclosure (100); Step 2: A support roller (401) and a cooling ring (402) are provided at the bottom of the quenching tank (400) to support the hollow wear-resistant cast ball (300). The support roller (401) is used to support the hollow wear-resistant cast ball (300), and the cooling ring (402) is provided with a liquid outlet. The outside of the quenching tank (400) is also provided with a quenching liquid circulation component, a driving structure and a liquid supply structure. The liquid supply structure supplies liquid to the cooling ring (402), and the driving structure drives the cooling ring (402) to move inside the hollow wear-resistant cast ball (300). Hollow wear-resistant steel balls are placed in a water-based quenching liquid at a temperature of 20~50℃ for cooling. During the quenching process, the quenching liquid will be heated and form steam. The moving closed cover (100) condenses the steam and returns it to the quenching tank (400). The cooling ring (402) is inserted into the hollow wear-resistant cast ball (300). The liquid supply structure supplies liquid to the inside of the cooling ring (402). The driving structure drives the cooling ring (402) to continuously supply liquid to the hollow wear-resistant cast ball (300). Step 3: When the surface temperature of the hollow cast ball drops to 200~300℃, lift it out of the quenching tank (400). Step 4: Temper the extracted hollow wear-resistant cast balls (300) at 160~250℃ for 1~3 hours.

8. The method of using the water-based quenching fluid for hollow wear-resistant cast balls according to claim 7, characterized in that, The drive structure includes a motor (403) and a transmission gear (404). A bevel gear (405) is installed at the output end of the motor (403). Two transmission gears (404) are respectively meshed on the upper and lower sides of the bevel gear (405). The transmission gears (404) are rotatably mounted at the bottom of the quenching tank (400), and a transmission rod (406) is inserted inside the transmission gears (404). A transmission sleeve (407) is provided on the transmission rod (406) between the transmission gears (404). The two ends of the transmission sleeve (407) are... For the transmission tooth surface, one of the transmission tooth surfaces is meshed with the corresponding transmission gear (404). The cooling ring (402) is driven and fitted on the transmission rod (406). A guide rod (420) is provided in the quenching tank (400). The guide rod (420) and the cooling ring (402) are slidably fitted. A guide seat (408) is provided at the bottom of the quenching tank (400). The transmission rod (406) is inserted into the guide seat (408). A switching element (409) for switching the axial position of the transmission rod (406) is provided in the guide seat (408). Two connecting discs (421) are inserted on the guide rod (420). The axial position of the two connecting discs (421) relative to the guide rod (420) is adjustable. An elastic body (422) is provided on the connecting disc (421). The elastic body (422) is used to act as a cooling ring (402).

9. The method of using the water-based quenching fluid for hollow wear-resistant cast balls according to claim 7, characterized in that, The liquid supply structure includes a circulation pump (410), which is connected to a filter (411) via a pipe. The filter (411) includes a housing (411), and a stepper motor (4112) is installed on the top of the housing (411). A transmission gear set is installed at the output end of the stepper motor (4112) to drive the filter element (4111) inside the housing (411) to rotate at a set angle. The filter element (4111) is provided with multiple circumferentially distributed filter parts. The filter parts include two side plates (4113), a filter screen (4114) distributed between the two side plates (4113), and an opening and closing plate. (4115), the filter screen (4114) is set facing the liquid inlet of the box (411), the opening and closing plate (4115) is symmetrically distributed in two sets and is rotatably installed on the side of the side plate (4113) away from the liquid inlet, a torsion spring is provided between the opening and closing plate (4115) and the side plate (4113), an inner support body (4116) is provided inside the filter element (4111), the inner support body (4116) is fixed inside the box (411), an inner guide half ring (4117) is provided on the inner support body (4116), the inner guide half ring (4117) is used to constrain the opening and closing plate (4115) at the non-liquid inlet.

10. The method of using the water-based quenching fluid for hollow wear-resistant cast balls according to claim 7, characterized in that, The bottom of the filter element (4111) is provided with an upper discharge notch (4119), and the side of the box (411) away from the liquid inlet is provided with a lower discharge notch (4118). After the filter element (4111) is rotated at a certain angle, the upper discharge notch (4119) and the lower discharge notch (4118) can overlap. Pressure sensors are provided at the liquid inlet of the box (411) and inside the filter element (4111).

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