Sand mixing device and process for improving the disintegration of ester-hardened water glass sand

Abstract

The present invention discloses an ester hardening device and process for a modified binder for improving the disintegration property of water glass sand. The present invention uses a batching device to quantitatively add ester, an accelerator, a disintegrating agent and water glass, and mix and stir to form a product. Then, three feeding devices are used to respectively add new sand, old sand and the product to a mixing, stirring and hardening device for mixing and hardening to obtain water glass sand with high disintegration property and high hardness for casting. When adding materials, the three feeding devices are linked and performed synchronously, which is beneficial to the mixing of raw materials. In addition, the performance of the water glass sand is improved by the addition of esters, accelerators and disintegrating agents. While reducing casting costs and improving casting quality, the amount of water glass used is reduced, making the obtained water glass sand more conducive to recycling, effectively reducing waste emissions in the casting process, reducing environmental pollution, breaking through advanced energy-saving and carbon-reduction technologies, and accelerating the development and application of low-carbon smelting technologies.

Description

Technical Field

[0001] The present invention relates to the field of advanced steel material processing, and in particular to a sand mixing device and process for improving the collapsibility of ester-hardened water glass sand. Background Art

[0002] Water glass, also known as sodium silicate, is a multiphase dispersed aqueous solution consisting of a true sodium silicate solution and silica gel particles. Due to its low cost, abundant resources, convenient operation, pollution-free operation, flexible application, energy conservation, high-quality castings, and minimal waste, it was introduced to my country's foundry industry in the early 1950s. It has achieved widespread application, particularly in steel castings, and its use is expected to continue to expand, with a promising future.

[0003] In the casting process, water glass sand is widely used due to its colorless, odorless, low price, and easy operation. However, with the development of green and clean casting technology, traditional water glass sand, as a unique casting material, has become unsuitable for current production process requirements due to its significant shortcomings, including low sand mold strength, high water glass dosage, high water content, easy moisture absorption, poor winter hardening, poor sand core collapsibility, difficulty in manual sand removal, difficulty in regeneration, large amounts of old sand being discarded, and environmental pollution. Summary of the Invention

[0004] Based on the shortcomings of the prior art of high addition of water glass sand for casting, poor collapsibility and difficulty in recycling, the present invention provides a sand mixing device and process for improving the collapsibility of ester-hardened water glass sand.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a sand mixing device for improving the collapsibility of ester-hardened water glass sand, comprising:

[0006] A batching device, comprising a batching silo, wherein a first stirring device is provided in the batching silo for quantitatively adding esters, water glass and additives and stirring them uniformly;

[0007] The first feeding device comprises a first feeding bin and a spiral feeder is provided in the bin for adding new sand;

[0008] The second feeding device has a second feeding bin and a spiral feeder is provided in the bin for adding old sand;

[0009] The third feeding device is a draw-out feeding device, which is connected to the proportioning silo;

[0010] A mixing, stirring and hardening device comprises a mixing and stirring chamber, a second stirring device is provided in the mixing and stirring chamber, and the discharge ends of the first feeding device, the second feeding device and the extractable feeding device are all connected to the mixing and stirring chamber;

[0011] Among them, the two spiral feeders and the extraction type feeding device are synchronously driven by the driving device so that when feeding, the water glass, sand, esters and additives are synchronously and in equal proportions added to the mixing bin within the same time period.

[0012] Preferably, the extractable feeding device includes a hollow sealing seat, a feed pipe arranged on the top of the sealing seat, a discharge pipe arranged on the left side of the sealing seat, a piston cylinder arranged on the right side of the sealing seat and a switch shaft rotatably arranged in the sealing seat. Sealing rings are provided on both sides of the switch shaft for forming a seal with the inner wall of the sealing seat. The feed pipe is connected with the proportioning bin, and the discharge pipe is connected with the mixing bin. A T-shaped three-way channel is provided on the switch shaft. One end of the switch shaft extends out of the sealing seat and is provided with a first driving mechanism that drives it to rotate back and forth 90 degrees. A piston rod is provided in the piston cylinder, and the outer end of the piston rod is provided with a transmission mechanism that drives it to extend and retract. The transmission mechanism and the two spiral feeders are driven synchronously.

[0013] Preferably, the transmission mechanism includes a mounting frame and a rotating wheel arranged on the mounting frame. An articulated arm is hinged at an eccentric position on the rotating wheel. The other end of the articulated arm is rotatably connected to the outer end of the piston rod. The rotating wheel and the two spiral feeders are driven synchronously.

[0014] Preferably, it also includes a driving motor, and both spiral feeders have a feeding shaft, which is connected by a sprocket transmission. One of the two feeding shafts is connected to the output shaft of the driving motor, and the end of the output shaft is provided with a bevel gear and meshed with a bevel gear. The bevel gear has a gear shaft and the gear shaft is connected to the rotating wheel.

[0015] Preferably, the first driving mechanism includes a driving cylinder rotatably arranged on a mounting frame and a hinged rod rotatably arranged at the end of the driving cylinder, the end of the hinged rod is fixedly connected to the outer end of the switch shaft, a magnetic steel block is provided on the rotating wheel, a Hall sensor is provided on the mounting frame, and the Hall sensor is electrically connected to the control unit of the driving cylinder.

[0016] Preferably, the second stirring device includes an external stirring device arranged in the stirring bin, the external stirring device has a feeding channel inside, the first feeding device, the second feeding device and the third feeding device all add materials into the feeding channel, the feeding channel is provided with an internal stirring device, and the external stirring device and the internal stirring device are driven by the stirring drive mechanism to rotate in opposite directions.

[0017] Preferably, the external stirring device includes a circular tubular shaft on the lower side and a conical bucket arranged on the top of the shaft. The shaft is rotatably matched with the mixing and stirring bin and extends out of the mixing and stirring bin to be driven to rotate by the stirring drive mechanism.

[0018] Preferably, the internal stirring device includes a stirring shaft that rotates with the mixing and stirring bin and extends out of the mixing and stirring bin and is driven by a stirring drive mechanism. The upper part of the stirring shaft is provided with a right-angled trapezoidal stirring blade and the stirring blade is located in the conical bucket. The lower part of the stirring shaft is provided with a spiral blade and the spiral blade is located in the tube shaft. Two S-shaped blades are provided on the lower outer wall of the tube shaft, and the bottom end of the S-shaped blade is located at the bottom surface of the mixing and stirring bin.

[0019] Preferably, the stirring drive mechanism includes a motor, a first ring gear arranged on the tube shaft and a second ring gear arranged on the stirring shaft. A first gear and a second gear are provided on the motor shaft of the motor. The first gear is engaged with the first ring gear, and the second ring gear is connected to the second ring gear through a transmission gear.

[0020] The sand mixing process for improving the collapsibility of ester-hardened water glass sand is carried out using the above-mentioned sand mixing device for improving the collapsibility of ester-hardened water glass sand, and comprises the following steps:

[0021] S1, ingredients: esters, additives and water glass are added in proportion and mixed, the additives include disintegrating agents and accelerators;

[0022] S2, material addition: New sand and old sand are added to the mixing and stirring bin via the first and second feeding devices, respectively. Simultaneously, the product prepared in step S1 is extracted via the extractive feeding device and delivered to the mixing and stirring bin. The first, second, and extractive feeding devices are set to a linkage mode, i.e., when the first feeding device is feeding, the second feeding device and the extractive feeding device are simultaneously feeding, and the feeding ratio is controlled according to the transmission ratio;

[0023] S3, mixing and reacting: the materials added to the mixing and stirring bin are fully and evenly stirred to form the required water glass sand. During mixing, the materials are stirred once and then stirred a second time to obtain water glass sand with high disintegration and high hardness.

[0024] Compared with the prior art, the advantages of the present invention are as follows: the present invention adds ester, accelerator, disintegrator and water glass in a quantitative manner and mixes and stirs them to form a product through a batching device, and then uses three feeding devices to add new sand, old sand and the product to a mixing, stirring and hardening device for mixing and hardening to obtain water glass sand with high disintegration and high hardness for casting. When adding materials, the three feeding devices are linked and carried out synchronously, which is beneficial to the mixing of raw materials. In addition, the performance of water glass sand is improved by the addition of esters, accelerators and disintegrators. While reducing casting costs and improving casting quality, the amount of water glass used is reduced, making the obtained water glass sand more conducive to recycling, effectively reducing waste emissions in the casting process, reducing environmental pollution, breaking through advanced energy-saving and carbon reduction technologies, and accelerating the research and development and application of low-carbon smelting technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be described in further detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and should not be construed as limiting the scope of the present invention. Furthermore, unless otherwise specified, the drawings are merely schematic representations of the composition or structure of the depicted objects and may contain exaggerated representations. Furthermore, the drawings are not necessarily drawn to scale.

[0026] Figure 1 is a perspective view of Example 1;

[0027] Figure 2 is a perspective view of Example 1;

[0028] Figure 3 is a perspective view of Example 1;

[0029] Figure 4 2 is a cross-sectional view of the mixing, stirring and hardening device in Example 1;

[0030] Figure 5 This is an exploded view of the mixing, stirring and hardening device in Example 1;

[0031] Figure 6 is a perspective view of the feeding device in Example 1;

[0032] Figure 7 This is an exploded view of the extractable feeding device in Example 1;

[0033] In the figure: 10, batching device; 20, first feeding device; 201, 501, feeding shaft; 30, third feeding device; 301, mounting frame; 302, first driving mechanism; 3021, driving cylinder; 3022, articulated rod; 303, rotating wheel; 304, articulated arm; 305, switch shaft; 306, piston cylinder; 307, sealing seat; 3071, feeding pipe; 3072, discharge pipe; 3073, piston rod; 40, mixing and hardening device ; 401, stirring shaft; 4010, second ring gear; 4011, spiral blade; 4012, stirring blade; 402, pipe shaft; 4021, first ring gear; 403, stirring drive mechanism; 4031, motor; 4032, first gear; 4033, second gear; 404, conical bucket; 405, S-shaped blade; 50, second feeding device; 01, drive motor; 011, output shaft; 012, bevel gear; 02, bevel gear; 021, gear shaft. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention. Example 1

[0035] Sand mixing device for improving the disintegration of ester hardened water glass sand, such as Figure 1-7 Shown, including,

[0036] The batching device 10 has a batching silo, in which a first stirring device is provided for quantitatively adding esters, water glass and additives and stirring them uniformly;

[0037] The first feeding device 20 has a first feeding bin and a screw feeder inside the bin for adding new sand;

[0038] The second feeding device 50 has a second feeding bin and a screw feeder inside the bin for adding used sand;

[0039] The third feeding device 30 is an extractable feeding device, which is connected to the proportioning silo;

[0040] The mixing and hardening device 40 has a mixing and hardening chamber, in which a second stirring device is provided. The discharge ends of the first feeding device 20, the second feeding device 50 and the extractable feeding device are all connected to the mixing and hardening chamber.

[0041] Among them, the two spiral feeders and the extraction type feeding device are synchronously driven by the driving device so that when feeding, water glass, sand, esters and additives are synchronously and in equal proportions within each time period of equal length into the mixing and stirring bin. This solution uses the batching device 10 to quantitatively add ester, accelerator, disintegrator and water glass and mix and stir to form a product, and then uses the three feeding devices to add new sand, old sand and the product to the mixing, stirring and hardening device 40 for mixing and hardening to obtain water glass sand with high disintegration and high hardness for casting. When feeding, the three feeding devices are linked and synchronized, which is conducive to the mixing of raw materials. In addition, the performance of water glass sand is improved by the addition of esters, accelerators and disintegrators. While reducing casting costs and improving casting quality, the amount of water glass used is reduced, making the obtained water glass sand more conducive to recycling, effectively reducing waste emissions in the casting process, reducing environmental pollution, breaking through advanced energy-saving and carbon-reduction technologies, and accelerating the development and application of low-carbon smelting technologies.

[0042] Preferably, the extractable feeding device includes a hollow sealing seat 307, a feed pipe 3071 arranged at the top of the sealing seat 307, a discharge pipe 3072 arranged on the left side of the sealing seat 307, a piston cylinder 306 arranged on the right side of the sealing seat 307 and a switch shaft 305 rotatably arranged in the sealing seat 307, and sealing rings are provided on both sides of the switch shaft 305 for forming a seal with the inner wall of the sealing seat 307, the feed pipe 3071 is connected to the proportioning bin, and the discharge pipe 3072 is connected to the mixing and stirring bin, and a T-shaped three-way channel is provided on the switch shaft 305. One end of the switch shaft 305 extends out of the sealing seat 307 and is provided with a first driving mechanism 302 that drives it to rotate back and forth 90 degrees. A piston rod 3073 is provided in the piston cylinder 306, and the outer end of the piston rod 3073 is provided with a transmission mechanism that drives it to extend and retract, and the transmission mechanism and the two spiral feeders are driven synchronously. The extraction-type feeding device includes two processes: extraction and pushing. When extracting, the three-way channel connects the proportioning bin and the piston cylinder 306, and the piston rod 3073 in the piston cylinder 306 moves outward to draw the raw materials into the piston cylinder 306. When pushing, the switch shaft 305 is rotated ninety degrees to connect the piston cylinder 306 and the discharge pipe 3072, and the piston rod 3073 in the piston cylinder 306 moves inward to push the extracted raw materials into the discharge pipe 3072. The discharge pipe 3072 is connected to the mixing and stirring bin to push the raw materials into the mixing and stirring bin.

[0043] Preferably, the transmission mechanism includes a mounting frame 301, a rotating disc 303 mounted on the mounting frame 301, and an articulated arm 304 hingedly connected at an eccentric position on the rotating disc 303. The other end of the articulated arm 304 is rotatably connected to the outer end of the piston rod 3073. The rotating disc 303 and the two spiral feeders are driven synchronously. When the rotating disc 303 rotates, the articulated arm 304 moves, thereby driving the piston rod 3073 to extend and retract.

[0044] Preferably, a drive motor 01 is further included. Both spiral feeders have feed shafts 201 and 501, which are connected by a sprocket transmission. One of the two feed shafts 201 and 501 is connected by a transmission connection to the output shaft 011 of the drive motor 01. The end of the output shaft 011 is provided with a bevel gear 012 and meshes with a bevel gear 02. The bevel gear 02 has a gear shaft 021, and the gear shaft 021 is connected by a transmission connection to the rotating wheel 303. The drive motor 01 drives the two feed shafts 201 and 501 to rotate synchronously. At the same time, the transmission direction is changed by the bevel gear 02 and the bevel gear 012, and then the transmission is transmitted to the rotating wheel 303, driving the rotating wheel 303 to rotate. The rotating wheel 303 and the gear shaft 021 can be connected by a set of sprocket transmissions.

[0045] Preferably, the first drive mechanism 302 includes a drive cylinder 3021 rotatably mounted on the mounting frame 301 and a hinged rod 3022 rotatably mounted at the end of the drive cylinder 3021. The end of the hinged rod 3022 is fixedly connected to the outer end of the switch shaft 305. A magnetic block is provided on the rotating wheel 303, and a Hall effect sensor is provided on the mounting frame 301. The Hall effect sensor is electrically connected to the control unit of the drive cylinder 3021. In this embodiment, the first drive mechanism 302 is used to drive the switch shaft 305 to rotate. In addition, the Hall effect sensor and the magnetic block mounted on the rotating wheel 303 are used to sense the position of the rotating wheel 303. When the Hall effect sensor senses the magnetic block, it transmits a signal to the control unit of the drive cylinder 3021, thereby controlling the extension and retraction of the drive cylinder 3021 and rotating the switch shaft 305 to open different channels for drawing or pushing materials.

[0046] Preferably, the second stirring device comprises an external stirring device disposed within the stirring chamber. The external stirring device has a feed channel within it. The first feeding device 20, the second feeding device 50, and the third feeding device 30 all feed materials into the feed channel. The feed channel is provided with an internal stirring device. The external stirring device and the internal stirring device are driven to rotate in opposite directions by a stirring drive mechanism 403. Bidirectional stirring ensures that the new sand, the old sand, the reagent, and the ester are fully mixed, resulting in a uniform texture of the resulting water glass sand.

[0047] Preferably, the external stirring device includes a circular tubular shaft 402 on the lower side and a conical bucket 404 arranged on the top of the shaft 402. The shaft 402 rotates with the mixing and stirring bin and extends out of the mixing and stirring bin to be driven to rotate by the stirring drive mechanism 403.

[0048] Preferably, the internal stirring device includes a stirring shaft 401 that rotates with the mixing and stirring chamber, extends outside the mixing and stirring chamber, and is driven by a stirring drive mechanism 403. The upper portion of the stirring shaft 401 is provided with a right-angled trapezoidal stirring blade 4012, and the stirring blade 4012 is located in a conical bucket 404. The lower portion of the stirring shaft 401 is provided with a spiral blade 4011, and the spiral blade 4011 is located in the tube shaft 402. The lower outer wall of the tube shaft 402 is provided with two S-shaped blades 405, and the bottom ends of the S-shaped blades 405 are located at the bottom surface of the mixing and stirring chamber. The S-shaped blades 405 provide a second stirring of the material.

[0049] Preferably, the stirring drive mechanism 403 includes a motor 4031, a first ring gear 4021 disposed on the tube shaft 402, and a second ring gear 4010 disposed on the stirring shaft 401. The motor 4031 shaft of the motor 4031 is provided with a first gear 4032 and a second gear 4033. The first gear 4032 is meshed with the first ring gear 4021, and the second ring gear 4010 is connected to the second ring gear 4010 via a transmission gear. This embodiment shows the specific structure of the stirring drive mechanism 403. Example 2

[0050] The sand mixing process for improving the collapsibility of ester-hardened water glass sand is carried out using the above-mentioned sand mixing device for improving the collapsibility of ester-hardened water glass sand, and comprises the following steps:

[0051] S1, ingredients: esters, additives and water glass are added in proportion and mixed, the additives include disintegrating agents and accelerators;

[0052] S2, material addition: new sand and old sand are added to the mixing and stirring bin respectively through the first feeding device and the second feeding device, and the product prepared in step S1 is extracted by the extraction feeding device and sent to the mixing and stirring bin, and the first feeding device, the second feeding device and the extraction feeding device are set to a linkage mode, that is, when the first feeding device adds material, the second feeding device and the extraction feeding device add material synchronously, and the feeding ratio is controlled according to the transmission ratio. For example, when the shaft of the screw feeder in the first feeding device rotates K circles, the shaft of the screw feeder in the second feeding device rotates K1 circles, and at the same time the extraction feeding device extracts and adds K2, the ratio of K, K1 and K2 is preset through the transmission ratio so that the ratio of material added when the three rotate K, K1 and K2 circles is the required ratio;

[0053] S3, mixing and reacting: the materials added to the mixing and stirring bin are fully and evenly stirred to form the required water glass sand. During mixing, the materials are fed and stirred once, and then stirred a second time to obtain water glass sand with high disintegration and high hardness. This step is carried out using the mixing, stirring and hardening device in Example 1. The raw materials are all added to the conical bucket and stirred for the first time inside, and then fall into the outer area and are stirred for the second time by the S-shaped blades.

[0054] The above describes the sand mixing device and process for improving the collapsibility of ester-hardened water glass sand provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The above examples are intended only to facilitate understanding of the present invention and its core concepts. It should be noted that those skilled in the art will be able to make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications fall within the scope of protection of the claims.

Claims

1. A sand mixing device for improving the disintegration of ester-hardened water glass sand, characterized in that: include, A batching device having a batching silo, wherein a first stirring device is provided in the batching silo for quantitatively adding esters, water glass and auxiliary agents and stirring them uniformly, wherein the auxiliary agents include disintegrating agents and accelerators; The first feeding device comprises a first feeding bin and a spiral feeder is provided in the bin for adding new sand; The second feeding device has a second feeding bin and a spiral feeder is provided in the bin for adding old sand; The third feeding device is a draw-out feeding device, which is connected to the proportioning silo; The mixing, stirring and hardening device comprises a mixing and stirring bin, a second stirring device is arranged in the mixing and stirring bin, the discharge ends of the first feeding device, the second feeding device and the extractable feeding device are all connected to the mixing and stirring bin, the second stirring device comprises an external stirring device arranged in the stirring bin, a feeding channel is provided inside the external stirring device, the first feeding device, the second feeding device and the third feeding device all feed materials into the feeding channel, an internal stirring device is arranged in the feeding channel, the external stirring device and the internal stirring device are driven by a stirring drive mechanism to rotate in opposite directions; the external stirring device comprises a circular tubular shaft on the lower side and a conical bucket arranged on the top of the shaft, the shaft rotates in conjunction with the mixing and stirring bin and extends out of the mixing and stirring bin to pass through the mixing and stirring bin The driving mechanism drives the stirring device to rotate; the internal stirring device includes a stirring shaft that rotates with the mixing and stirring bin and extends out of the mixing and stirring bin and is driven by the stirring driving mechanism; the upper part of the stirring shaft is provided with a right-angled trapezoidal stirring blade, and the stirring blade is located in the conical bucket; the lower part of the stirring shaft is provided with a spiral blade, and the spiral blade is located in the tube shaft; the lower outer wall of the tube shaft is provided with two S-shaped blades, and the bottom ends of the S-shaped blades are located at the bottom surface of the mixing and stirring bin; the stirring driving mechanism includes a motor, a first gear ring provided on the tube shaft, and a second gear ring provided on the stirring shaft; a first gear and a second gear are provided on the motor shaft of the motor, the first gear is meshed with the first gear ring, and the second gear ring is connected to the second gear ring through a transmission gear; Among them, the two spiral feeders and the extraction type feeding device are synchronously driven by the driving device so that when feeding, the water glass, sand, esters and additives are synchronously and in equal proportions added to the mixing bin within the same time period.

2. The sand mixing device for improving the collapsibility of ester-hardened water glass sand according to claim 1, characterized in that: The extractable feeding device includes a hollow sealing seat, a feed pipe arranged on the top of the sealing seat, a discharge pipe arranged on the left side of the sealing seat, a piston cylinder arranged on the right side of the sealing seat and a switch shaft rotatably arranged in the sealing seat. Sealing rings are provided on both sides of the switch shaft for forming a seal with the inner wall of the sealing seat. The feed pipe is connected with the proportioning bin, and the discharge pipe is connected with the mixing bin. A T-shaped three-way channel is provided on the switch shaft. One end of the switch shaft extends out of the sealing seat and is provided with a first driving mechanism that drives it to rotate back and forth 90 degrees. A piston rod is provided in the piston cylinder, and the outer end of the piston rod is provided with a transmission mechanism that drives it to extend and retract. The transmission mechanism and the two spiral feeders are driven synchronously.

3. The sand mixing device for improving the collapsibility of ester-hardened water glass sand according to claim 2, characterized in that: The transmission mechanism includes a mounting frame and a rotating wheel arranged on the mounting frame. An articulated arm is hinged at an eccentric position on the rotating wheel. The other end of the articulated arm is rotatably connected to the outer end of the piston rod. The rotating wheel and the two spiral feeders are driven synchronously.

4. The sand mixing device for improving the collapsibility of ester-hardened water glass sand according to claim 3, characterized in that: It also includes a driving motor. Both spiral feeders have a feeding shaft, and the two feeding shafts are connected by a sprocket. One of the two feeding shafts is connected to the output shaft of the driving motor. The end of the output shaft is provided with a bevel gear and meshed with a bevel gear. The bevel gear has a gear shaft and the gear shaft is connected to the rotating wheel.

5. The sand mixing device for improving the collapsibility of ester-hardened water glass sand according to claim 4, characterized in that: The first driving mechanism includes a driving cylinder rotatably arranged on a mounting frame and a hinged rod rotatably arranged at the end of the driving cylinder, the end of the hinged rod is fixedly connected to the outer end of the switch shaft, a magnetic steel block is provided on the rotating wheel, a Hall sensor is provided on the mounting frame, and the Hall sensor is electrically connected to the control unit of the driving cylinder.

6. A sand mixing process for improving the collapsibility of ester-hardened water glass sand, which is carried out using the sand mixing device for improving the collapsibility of ester-hardened water glass sand according to any one of claims 1 to 5, characterized in that: The following steps are included: S1, ingredients: esters, additives and water glass are added in proportion and mixed, the additives include disintegrating agents and accelerators; S2, material addition: New sand and old sand are added to the mixing and stirring bin via the first and second feeding devices, respectively. Simultaneously, the product prepared in step S1 is extracted via the extractive feeding device and delivered to the mixing and stirring bin. The first, second, and extractive feeding devices are set to a linkage mode, i.e., when the first feeding device is feeding, the second feeding device and the extractive feeding device are simultaneously feeding, and the feeding ratio is controlled according to the transmission ratio; S3, mixing and reacting: the materials added to the mixing and stirring bin are fully and evenly stirred to form the required water glass sand. During mixing, the materials are stirred once and then stirred a second time to obtain water glass sand with high disintegration and high hardness.

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