Highly disintegrating water glass waste sand regeneration and recycling device and process

Abstract

The present invention discloses a device and process for regenerating and reusing high-disintegrability water glass used sand. The device includes: a regeneration chamber and a beating and stirring device provided in the regeneration chamber for beating and stirring the old sand and causing friction between the old sand to cause the water glass film on the surface of the old sand to fall off. In addition, the feeding and discharging are improved in the process so that the powder and the detached film are discharged from the upper discharge port, and the treated old sand is discharged from the lower discharge port after two screenings, thereby greatly increasing the amount of the used sand that can be utilized. The present application provides a beating and stirring device that can rotate and revolve so that the old sand is struck and stirred in the regeneration chamber, causing friction. The multi-directional beating and friction can effectively cause the water glass film on the surface of the old sand to fall off. In addition, when discharging, by adding new material, the new material sinks, and the small particle material and the detached film rise and separate into layers, thereby being discharged from the upper layer. The de-filmed old sand is then discharged from the lower discharge port, thereby reducing the film content of the discharged old sand and improving the quality of the regenerated sand.

Description

Technical Field

[0001] The present invention relates to the technical field of water glass sand recovery and regeneration, and in particular to a device and process for regenerating and reusing high-disintegrability water glass waste sand. Background Art

[0002] Traditionally, physical methods have been used to regenerate water glass, which can be categorized as wet or dry regeneration. The wet method involves dissolving residual Na₂O with water. After magnetic separation, crushing, screening, and secondary magnetic separation, the used water glass sand is immersed in cold, hot, or dilute alkaline water. Vigorous stirring or ultrasonic agitation is used, resulting in a Na₂O removal rate of 80% to 90%, reducing the residual Na₂O in the regenerated sand to less than 0.1%. However, the wet sand requires multiple steps, including filtration, rinsing, drying, drying, and airflow cooling, which consumes significant energy. Furthermore, a large amount of wastewater must be purified before it can be discharged. The complex procedures, large and expensive equipment, and high energy consumption put the regeneration cost almost on par with the price of new sand. Dry regeneration, which uses mechanical friction to remove residual Na₂O, is a popular method used both domestically and internationally. However, using a grinding mill can result in excessive friction, leading to sand pulverization, while conventional stirring, which involves the collision and friction of the used sand, is inefficient and yields poor results. Summary of the Invention

[0003] Based on the shortcomings of the prior art in which the wet regeneration steps are cumbersome, the cost is high, the use of a grinder causes the old sand to be crushed, and the use of an ordinary stirring device is prone to incomplete removal of the water glass film, the present invention provides a highly disintegrating water glass old sand regeneration and reuse device and process.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: a high-disintegrability water glass waste sand regeneration and reuse device, comprising:

[0005] The regeneration bin has a cavity, a lower discharge port is provided on the lower side wall of the cavity, an upper discharge port is provided on the upper side wall of the cavity, and both the lower discharge port and the upper discharge port are provided with screens;

[0006] The beating stirring device is arranged in the cavity, and comprises an internal stirring device, the internal stirring device comprises a stirring frame with an installation space inside, a stirring column located in the installation space and rotatably connected to the stirring frame, a stirring blade arranged on the stirring frame by a rotating shaft, and a transmission shaft arranged at the bottom of the stirring frame, the transmission shaft passes through the bottom of the regeneration bin and extends out of the regeneration bin, the bottom of the stirring column has an extension rod that passes through the transmission shaft and rotates with the transmission shaft and extends out of the regeneration bin, the bottom end of the extension rod has a square head, and the regeneration bin is provided with a limiting structure for inserting the square head to limit the rotation of the extension rod, a plurality of tracks are provided on the stirring column, the tracks include two relative high points and two relative low points and transition from the high point to the low point through a smooth curved surface, and the track is a sinusoidal waveform structure after unfolding, an L-shaped connecting rod is provided at the inner end of the rotating shaft of the stirring blade, and a walking wheel is provided at the inner end of the connecting rod, the walking wheel extends into the track and travels along the track when the stirring frame rotates to drive the stirring blade to rotate, a plurality of tracks are provided at different heights, and each track is provided with a plurality of stirring blades;

[0007] The driving device is arranged outside the regeneration bin and is in transmission connection with the striking device to drive the striking and stirring device to stir and strike the old sand.

[0008] Preferably, a sand shakeout machine is also included, which is arranged at the head end of the conveyor and is used to vibrate and crush the sand blocks produced by casting.

[0009] Preferably, a conveyor is further included, which is connected to the regeneration bin and is used to transport the old sand into the regeneration bin.

[0010] Preferably, a spiral feeder is provided at the tail end of the conveyor for quantitatively adding old sand into the regeneration bin.

[0011] Preferably, an external stirring device is also provided within the chamber. The external stirring device comprises a stirring drum rotatably mounted on the side wall of the chamber, the stirring drum being in driving connection with a drive shaft. The stirring drum divides the chamber into an inner chamber and an outer chamber, and a through-hole is provided on the stirring drum connecting the inner and outer chambers. The internal stirring device is located within the inner chamber, with a gap between the bottom of the stirring drum and the bottom of the regeneration chamber. The outer wall of the stirring drum has spiral blades. The stirring drum is connected to a hanging ring via a connecting rod. The inner wall of the regeneration chamber is provided with an annular hanging platform. The hanging ring is hung on the hanging platform and is rotatably connected via two interlocking L-shaped joints and a bearing.

[0012] Preferably, the mixing drum is provided with a plurality of connecting columns, the inner ends of the connecting columns are provided with outer gear rings, the transmission shaft is provided with inner gear rings, and the inner gear rings and the outer gear rings are meshed.

[0013] Preferably, an annular sieve plate is provided on the transmission shaft, and a plurality of sieve holes are provided on the annular sieve plate. The aperture of the sieve holes is smaller than the particle size of the old sand and larger than the particle size of the old sand after film removal.

[0014] Preferably, the mixing frame is a cylindrical structure that can prevent old sand from entering the track. Each group of mixing blades is provided with four and are evenly distributed in a circular array. The edges of the mixing blades are provided with striking teeth. The top of the mixing frame is provided with an annular frame with a blanking hole, and the annular frame is provided with several wheel frames, and the wheel frames are provided with support wheels. The side wall of the regeneration bin is provided with an annular groove for the support wheel to extend into and move inside, and the height of each position of the annular groove is the same.

[0015] Preferably, the driving device includes a driving motor, an output end of the driving motor is provided with a driving gear, an outer end of the rotating shaft is provided with a passive gear, and the driving gear is meshed with the passive gear.

[0016] The high-collapsibility water glass used sand regeneration and reuse process is carried out using the high-collapsibility water glass used sand regeneration and reuse device described above, and includes the following steps:

[0017] S1, vibration crushing: adding the water glass sand after casting into the shakeout machine and vibrating and crushing it into old sand particles;

[0018] S2, stirring, beating and friction: the old sand particles are transported by the conveyor and quantitatively added to the regeneration bin through the spiral feeder, and then the driving device is started to stir the old sand particles. During stirring, the stirring blades follow the revolution of the stirring frame and rotate under the drive of the connecting rod to make the old sand particles rub and collide to break and remove the surface film. Secondly, during stirring, the mixing drum also rotates, and the spiral blades on the mixing drum will drive the light material to move upward. In the above process, the upper discharge port is always in the open state, and the generated film material is discharged from the upper discharge port. After a period of discharge, continue to add material. The added material has large particles in the initial stage and will sink, causing the large particles of old sand particles and the decomposed film to be separated. The decomposed film rises and is discharged from the discharge port. After a period of discharge, the lower discharge port is opened to discharge 80% of the processed old sand to reduce the amount of powder discharged from the lower discharge port, and the cycle is repeated.

[0019] S3, secondary manufacturing: collecting the old sand discharged from the lower discharge port in step S2 as back sand and mixing it with 20%-30% new sand to be used as raw material for the manufacture of water glass sand.

[0020] Compared with the prior art, the advantages of the present invention are as follows: the present application is provided with a beating and stirring device that can rotate and revolve, so that the old sand is beaten and stirred in the regeneration bin, generating friction. The multi-directional beating and friction can effectively cause the water glass film on the surface of the old sand to fall off. In addition, when discharging, by adding new material, the new material sinks while the small particle material and the detached film rise and stratify, and are thus discharged from the upper layer, and then the de-filmed old sand is discharged from the lower discharge port, which reduces the film content of the discharged old sand and is beneficial to improving the quality of the regenerated sand. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings and preferred embodiments. However, it will be appreciated by those skilled in the art that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be taken as limiting the scope of the present invention. In addition, unless otherwise specified, the drawings are not necessarily drawn to scale.

[0022] Figure 1 is a side view of Example 1;

[0023] Figure 2 is a perspective view of Example 1;

[0024] Figure 3 A perspective view of the striking and stirring device in Example 1;

[0025] Figure 4 This is a schematic diagram of the internal structure of the beating and stirring device of Example 1;

[0026] Figure 5 This is a cross-sectional view of the striking stirring device of Example 1;

[0027] Figure 6 This is an exploded view of the striking stirring device in Example 1;

[0028] Figure 7 This is an exploded view of the striking stirring device in Example 1;

[0029] In the figure: 10, sand shaker; 20, conveyor; 30, striking stirring device; 301, regeneration chamber; 3011, annular groove; 3012, inner cavity; 3013, outer cavity; 302, upper discharge port; 303, lower discharge port; 304, driving device; 3041, driving motor; 3042, driving gear; 3043, driven gear; 305, stirring frame; 3051, sieve plate; 3052, annular Frame; 3053, wheel frame; 3054, supporting wheel; 3055, inner ring gear; 3056, transmission shaft; 306, mixing drum; 3061, spiral blade; 3062, through hole; 3063, connecting column; 3064, outer ring gear; 307, mixing column; 3071, track; 3072, extension rod; 30721, square head; 308, mixing blade; 3081, connecting rod; 3082, striking tooth. DETAILED DESCRIPTION

[0030] 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

[0031] Highly collapsible water glass used sand regeneration and reuse device, such as Figure 1-7 Shown, including:

[0032] The regeneration chamber 301 has a cavity, a lower discharge port 303 is provided on the lower side wall of the cavity, and an upper discharge port 302 is provided on the upper side wall of the cavity, and both the lower discharge port 303 and the upper discharge port 302 are provided with screens;

[0033] The beating stirring device 30 is arranged in the cavity, which includes an internal stirring device, which includes a stirring frame 305 with an installation space inside, a stirring column 307 located in the installation space and rotatably connected to the stirring frame 305, a stirring blade 308 arranged on the stirring frame 305 by rotating the rotating shaft, and a transmission shaft 3056 arranged at the bottom of the stirring frame 305, the transmission shaft 3056 passes through the bottom of the regeneration chamber 301 and extends out of the regeneration chamber 301, the bottom of the stirring column 307 has an extension rod 3072 that passes through the transmission shaft 3056 and rotates with the transmission shaft 3056 and extends out of the regeneration chamber 301, the bottom end of the extension rod 3072 has a square head 30721 and is provided on the regeneration chamber 301 A limiting structure is provided for inserting a square head 30721 to limit the rotation of the extension rod 3072. The stirring column 307 is provided with a plurality of tracks 3071. The tracks 3071 include two relatively high points and two relatively low points, and a smooth curved surface transitions between the high points and the low points. When the tracks 3071 are unfolded, they have a sinusoidal waveform structure. An L-shaped connecting rod 3081 is provided at the inner end of the rotating shaft of the stirring blade 308. A running wheel is provided at the inner end of the connecting rod 3081. The running wheel extends into the track 3071 and runs along the track 3071 when the stirring frame 305 rotates to drive the stirring blade 308 to rotate. Several tracks 3071 are provided at different heights, and each track 3071 is provided with multiple stirring blades 308.

[0034] The driving device 304 is arranged outside the regeneration chamber 301 and is in transmission connection with the striking device to drive the striking and stirring device 30 to stir and strike the old sand while causing friction between the old sands.

[0035] Preferably, a sand shakeout machine 10 is further included, which is arranged at the head end of the conveyor 20 and is used to vibrate and crush the sand blocks produced by casting.

[0036] Preferably, a conveyor 20 is further included, which is connected to the regeneration bin 301 to transport the old sand into the regeneration bin 301 .

[0037] Preferably, a screw feeder is provided at the tail end of the conveyor 20 for quantitatively adding old sand into the regeneration bin 301. It should be noted that a cover can be provided on the top of the regeneration bin 301 to prevent gas from escaping, and the discharge port of the screw feeder penetrates the cover and extends into the regeneration bin 301.

[0038] Preferably, an external stirring device is also provided in the cavity, and the external stirring device includes a stirring drum 306 rotatably arranged on the side wall of the cavity, and the stirring drum 306 is connected to the transmission shaft 3056 for transmission. The stirring drum 306 divides the cavity into an inner cavity 3012 and an outer cavity 3013, and the stirring drum 306 is provided with a through hole 3062 that connects the inner and outer cavities 3013. The internal stirring device is located in the inner cavity 3012, and there is a gap between the bottom of the stirring drum 306 and the bottom of the regeneration bin 301, and the outer wall of the stirring drum 306 has a spiral blade 3061.

[0039] Preferably, the mixing drum 306 is provided with a plurality of connecting columns 3063 , the inner ends of the connecting columns 3063 are provided with outer gear rings 3064 , and the transmission shaft 3056 is provided with inner gear rings 3055 , which are meshed with the outer gear rings 3064 .

[0040] Preferably, an annular sieve plate 3051 is provided on the drive shaft 3056. The annular sieve plate 3051 has a plurality of sieve holes. The sieve holes have a diameter smaller than the particle size of the used sand and larger than the particle size of the used sand after the film is removed. The annular sieve plate 3051 is used to screen and allow particles with a smaller particle size after the film is removed to pass through, while larger particles are blocked at the top.

[0041] Preferably, the mixing frame 305 is a cylindrical structure that prevents old sand from entering the track 3071. Each set of mixing blades 308 includes four mixing blades 308 evenly spaced in a circular array. The edges of the mixing blades 308 are equipped with striking teeth 3082. A circular frame 3052 with a dropout hole is located on the top of the mixing frame 305. A plurality of wheel frames 3053 are mounted on the circular frame 3052, each of which is equipped with support wheels 3054. The sidewalls of the regeneration chamber 301 are provided with an annular groove 3011 that allows the support wheels 3054 to extend and travel within. The height of each position of the annular groove 3011 is uniform. The cylindrical structure keeps old sand out, preventing it from entering the track 3071 and causing excessive resistance.

[0042] Preferably, the driving device 304 includes a driving motor 3041 . A driving gear 3042 is provided at the output end of the driving motor 3041 . A driven gear 3043 is provided at the outer end of the rotating shaft. The driving gear 3042 is meshed with the driven gear 3043 . Example

[0043] The high-collapse water glass used sand regeneration and reuse process is carried out using the high-collapse water glass used sand regeneration and reuse device described in Example 1, and includes the following steps:

[0044] S1, vibration crushing: adding the water glass sand after casting into the shakeout machine and vibrating and crushing it into old sand particles;

[0045] S2, stirring, beating and friction: the old sand particles are transported by the conveyor and quantitatively added to the regeneration bin through the spiral feeder, and then the driving device is started to stir the old sand particles. During stirring, the stirring blades follow the revolution of the stirring frame and rotate under the drive of the connecting rod to make the old sand particles rub and collide to break and remove the surface film. Secondly, during stirring, the mixing drum also rotates, and the spiral blades on the mixing drum will drive the light material to move upward. In the above process, the upper discharge port is always in the open state, and the generated film material is discharged from the upper discharge port. After a period of discharge, continue to add material. The added material has large particles in the initial stage and will sink, causing the large particles of old sand particles and the decomposed film to be separated. The decomposed film rises and is discharged from the discharge port. After a period of discharge, the lower discharge port is opened to discharge 80% of the processed old sand to reduce the amount of powder discharged from the lower discharge port, and the cycle is repeated.

[0046] S3, secondary manufacturing: collecting the old sand discharged from the lower discharge port in step S2 as back sand and mixing it with 20%-30% new sand to be used as raw material for the manufacture of water glass sand.

[0047] The above describes the highly disintegrable water glass waste sand regeneration and reuse device and process provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is intended only to facilitate understanding of the present invention and its core concepts. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. Highly collapsible water glass waste sand regeneration and reuse device, characterized by: include: The regeneration bin has a cavity, a lower discharge port is provided on the lower side wall of the cavity, an upper discharge port is provided on the upper side wall of the cavity, and both the lower discharge port and the upper discharge port are provided with screens; The beating stirring device is arranged in the cavity, and comprises an internal stirring device, the internal stirring device comprises a stirring frame with an installation space inside, a stirring column located in the installation space and rotatably connected to the stirring frame, a stirring blade arranged on the stirring frame by a rotating shaft, and a transmission shaft arranged at the bottom of the stirring frame, the transmission shaft passes through the bottom of the regeneration bin and extends out of the regeneration bin, the bottom of the stirring column has an extension rod that passes through the transmission shaft and rotates with the transmission shaft and extends out of the regeneration bin, the bottom end of the extension rod has a square head, and the regeneration bin is provided with a limiting structure for inserting the square head to limit the rotation of the extension rod, a plurality of tracks are provided on the stirring column, the tracks include two relative high points and two relative low points and transition from the high point to the low point through a smooth curved surface, and the track is a sinusoidal waveform structure after unfolding, an L-shaped connecting rod is provided at the inner end of the rotating shaft of the stirring blade, and a walking wheel is provided at the inner end of the connecting rod, the walking wheel extends into the track and travels along the track when the stirring frame rotates to drive the stirring blade to rotate, a plurality of tracks are provided at different heights, and each track is provided with a plurality of stirring blades; A driving device is arranged outside the regeneration chamber and is in transmission connection with the striking device to drive the striking and stirring device to stir and strike; An external stirring device is also provided in the cavity, which includes a stirring drum rotatably arranged on the side wall of the cavity, the stirring drum is connected to the transmission shaft, the stirring drum divides the cavity into an inner cavity and an outer cavity, and the stirring drum is provided with a through hole connecting the inner and outer cavities, the internal stirring device is located in the inner cavity, there is a gap between the bottom of the stirring drum and the bottom of the regeneration bin, and the outer wall of the stirring drum has spiral blades; a number of connecting columns are provided on the stirring drum, an outer gear ring is provided at the inner end of the connecting column, an inner gear ring is provided on the transmission shaft, and the inner gear ring and the outer gear ring are meshed; an annular sieve plate is provided on the transmission shaft, and a number of sieve holes are provided on the annular sieve plate, the aperture of the sieve holes is smaller than the particle size of the old sand and larger than the particle size of the old sand after demolding.

2. The high-collapse water glass waste sand regeneration and reuse device according to claim 1 is characterized in that: It also includes a sand shakeout machine, which is arranged at the head end of the conveyor and is used for vibrating and breaking the sand blocks produced by casting.

3. The high-collapse water glass waste sand regeneration and reuse device according to claim 2 is characterized in that: It also includes a conveyor, which is connected to the regeneration bin and is used to transport the old sand into the regeneration bin.

4. The high-collapse water glass waste sand regeneration and reuse device according to claim 3 is characterized in that: A spiral feeder is provided at the tail end of the conveyor to quantitatively add old sand into the regeneration bin.

5. The high-collapse water glass waste sand regeneration and reuse device according to claim 1 is characterized in that: The mixing frame is a cylindrical structure that can prevent old sand from entering the track. Each group of mixing blades is equipped with four and evenly distributed in a circular array. The edges of the mixing blades are provided with striking teeth. The top of the mixing frame is provided with a ring frame with a drop hole, and the ring frame is provided with several wheel frames, and the wheel frames are provided with support wheels. The side wall of the regeneration bin is provided with an annular groove for the support wheels to extend into and move inside, and the height of each position of the annular groove is the same.

6. The high-collapse water glass waste sand regeneration and reuse device according to claim 1, characterized in that: The driving device comprises a driving motor, an output end of the driving motor is provided with a driving gear, an outer end of the rotating shaft is provided with a passive gear, and the driving gear is meshed with the passive gear.

7. A process for regenerating and reusing used high-collapse water glass sand, which is carried out using the device for regenerating and reusing used high-collapse water glass sand according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, vibration crushing: adding the water glass sand after casting into the shakeout machine and vibrating and crushing it into old sand particles; S2, stirring, beating and friction: the old sand particles are transported by the conveyor and quantitatively added to the regeneration bin through the spiral feeder, and then the driving device is started to stir the old sand particles. During stirring, the stirring blades follow the revolution of the stirring frame and rotate under the drive of the connecting rod to make the old sand particles rub and collide to break and remove the surface film. Secondly, during stirring, the mixing drum also rotates, and the spiral blades on the mixing drum will drive the light material to move upward. In the above process, the upper discharge port is always in the open state, and the generated film material is discharged from the upper discharge port. After a period of discharge, continue to add material. The added material has large particles in the initial stage and will sink, causing the large particles of old sand particles and the decomposed film to be separated. The decomposed film rises and is discharged from the discharge port. After a period of discharge, the lower discharge port is opened to discharge 80% of the processed old sand to reduce the amount of powder discharged from the lower discharge port, and the cycle is repeated. S3, secondary manufacturing: collecting the old sand discharged from the lower discharge port in step S2 as back sand and mixing it with 20%-30% new sand to be used as raw material for the manufacture of water glass sand.

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