High-collapsibility water glass used sand regeneration and reuse device and process

Abstract

The invention discloses a high-collapsibility used sodium silicate sand regeneration and reuse device and a high-collapsibility used sodium silicate sand regeneration and reuse process, the high-collapsibility used sodium silicate sand regeneration and reuse device comprises a regeneration bin and a beating and stirring device, and the beating and stirring device is arranged in the regeneration bin and used for beating and stirring used sand and generating friction between the used sand so as to enable a sodium silicate film on the surface of the used sand to fall off. The powder and the separated film are discharged from the upper discharging port, the treated used sand is discharged from the lower discharging port after being screened twice, and the usable amount of the used sand is increased to the maximum extent. According to the device, the beating and stirring device capable of rotating and revolving is arranged, so that used sand is beaten, stirred and rubbed in the regeneration bin, a water glass film on the surface of the used sand can effectively fall off through multi-directional beating and friction, in addition, new materials are added during discharging, the new materials sink, and small-particle materials and the falling-off film rise and are layered, so that the small-particle materials and the falling-off film are discharged from the upper layer; and then the demoulded old sand is discharged from the lower discharge port, so that the film content of the discharged old sand is reduced, and the quality of the regenerated sand is improved.

Description

Technical Field

[0001] The 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 old water glass sand with high disintegrability. Background Art

[0002] Water glass (sodium silicate) is currently the most successful inorganic chemical binder, and its long-term use is harmless to the human body. The use of water glass sand for modeling is cheap, has good fluidity, hardens quickly, and has high dimensional accuracy of the mold (core). There is no irritating odor or toxic gas produced during the sand mixing, modeling, pouring and sand dropping processes, and there is no black pollution. Since the water glass sand process was introduced to my country from the Soviet Union in the 1960s, it has been widely used. At present, about 70% of steel castings in China use the water glass sand casting process.

[0003] At present, the use of water glass in casting has the following important defects: the recycling rate of old water glass sand is low. Tens of millions of tons of old water glass sand are discarded in my country every year, and the waste water glass sand for casting is piled up like a mountain. Many factories with poor scientific and technological strength directly discard waste sand in rivers, valleys and the sea, causing vegetation to be destroyed, and the soluble alkaline water glass and other substances in the old sand will pollute surface water and groundwater, thus causing serious environmental pollution, causing the water glass sand technology, which originally had great environmental advantages, to become a factor of environmental pollution. Therefore, the use of water glass has become a double-edged sword for environmental protection. With the improvement of a series of mining laws in my country and the requirements for environmental protection, high-quality silica sand has become an increasingly scarce resource.

[0004] The traditional method of water glass regeneration is physical regeneration, which can be divided into two categories: wet regeneration and dry regeneration. The principle of wet regeneration is to dissolve the residual Na2O with water, and soak the old water glass sand in cold water, hot water or dilute alkaline water after magnetic separation, crushing, screening and secondary magnetic separation, and then immerse it in cold water, hot water or dilute alkaline water, assisted by strong stirring or ultrasonic vibration. The removal rate of Na2O can reach 80% to 90%, and the residual Na2O in the regenerated sand can be reduced to less than 0.1%. However, the wet sand needs to be treated by multiple steps such as filtration, leaching, drying, drying and airflow cooling, which consumes a lot of energy, and a large amount of wastewater must be purified before it can be discharged. The steps are complicated, the equipment is huge and expensive, the energy consumption is large, and the regeneration cost is almost the same as the price of new sand, and only indirect benefits of protecting the environment can be obtained. Domestic and foreign countries tend to adopt dry regeneration, the principle of which is to remove residual Na2O by mechanical friction. However, if a mill is used, it will cause excessive friction and crush the sand material, and ordinary stirring will cause the old sand to collide and rub with low efficiency, and the effect is poor. Summary of the invention

[0005] Based on the fact that the wet regeneration process in the prior art has complicated steps, high cost, and the use of a grinder causes the old sand to be broken, and the use of an ordinary stirring device is prone to incomplete removal of the water glass film, the present invention provides a high-disintegrability water glass old sand regeneration and reuse device and process.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a high-disintegrability water glass waste sand regeneration and recycling device, comprising:

[0007] The regeneration bin has a cavity, a lower discharge port is arranged on the lower side wall of the cavity, an upper discharge port is arranged on the upper side wall of the cavity, and screens are arranged at the lower discharge port and the upper discharge port;

[0008] The striking 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 rotatably arranged on the stirring frame through 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 rotatably cooperates 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 arranged 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 being unfolded, an L-shaped connecting rod is arranged at the inner end of the rotating shaft of the stirring blade, and a running wheel is arranged at the inner end of the connecting rod, the running wheel extends into the track and runs along the track when the stirring frame rotates to drive the stirring blade to rotate, and a plurality of tracks are arranged at different heights, and each track is provided with a plurality of stirring blades;

[0009] The driving device is arranged outside the regeneration bin and is in driving connection with the striking device to drive the striking and stirring device to stir and strike the old sand.

[0010] Preferably, a sand-falling machine is also included, which is arranged at the head end of the conveyor and is used to vibrate and break the sand blocks produced by casting.

[0011] Preferably, a conveyor is also included, which is connected to the regeneration bin and is used to transport the old sand into the regeneration bin.

[0012] Preferably, a spiral feeder is provided at the tail end of the conveyor for quantitatively adding old sand into the regeneration bin.

[0013] Preferably, an external stirring device is also provided in the cavity, and the external stirring device 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 separates the cavity into an inner cavity and an outer cavity, and a through hole is provided on the stirring drum to connect the inner and outer cavities, the internal stirring device is located in the inner cavity, the bottom of the stirring drum has a gap with the bottom of the regeneration bin, and the outer wall of the stirring drum has spiral blades. The stirring drum is connected to a hanging ring through a connecting rod, and an annular hanging platform is provided on the inner wall of the regeneration bin, and the hanging ring is hung on the hanging platform and is rotatably connected through two mutually hooked L-shaped connection structures and bearings.

[0014] Preferably, a plurality of connecting columns are provided on the mixing 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 is meshed with the outer gear ring.

[0015] Preferably, an annular sieve plate is provided on the transmission shaft, and a plurality of sieve holes are provided on the annular sieve plate, wherein 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.

[0016] Preferably, the stirring frame is a cylindrical structure that can prevent old sand from entering the track. Each group of stirring blades is provided with four and are evenly distributed in a circular array. The edges of the stirring blades are provided with striking teeth. The top of the stirring frame is provided with an annular frame with a drop hole, and a number of wheel frames are provided on the annular frame. The wheel frames are provided with supporting wheels. The side walls of the regeneration bin are provided with an annular groove for the supporting wheels to extend into and move inside, and the heights of the annular grooves at all positions are the same.

[0017] Preferably, 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.

[0018] The high-disintegrability water glass used sand regeneration and reuse process is carried out using the high-disintegrability water glass used sand regeneration and reuse device mentioned above, and comprises the following steps:

[0019] S1, vibration crushing: adding the water glass sand after casting into the sand shaker and vibrating and crushing it into old sand particles;

[0020] 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 at the same time, driven by the connecting rod, the old sand particles are rotated to rub and collide, so as 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 an open state, and the generated film material is discharged from the upper discharge port. After a period of discharge, continue to add materials. The added materials are large 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;

[0021] S3, secondary manufacturing: collecting the old sand discharged from the lower discharge port in step S2 as backing sand and mixing it with 20%-30% new sand to be used as raw material for manufacturing water glass sand.

[0022] 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 which can rotate and revolve so that the old sand is beaten and stirred in the regeneration bin to generate friction, and 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, new material is added to make the new material sink while the small particle material and the detached film rise and form layers, and thus are discharged from the upper layer, and then the de-filmed old sand is discharged from the lower discharge port, thereby reducing the film content of the discharged old sand and being beneficial to improving the quality of the regenerated sand. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0024] Figure 1 is a side view of Example 1;

[0025] Figure 2 is a stereogram of Example 1;

[0026] Figure 3 A three-dimensional diagram of the striking and stirring device in Example 1;

[0027] Figure 4 This is a schematic diagram of the internal structure of the beating and stirring device of Example 1;

[0028] Figure 5It is a cross-sectional view of the striking stirring device of Example 1;

[0029] Figure 6 This is an exploded view of the striking stirring device of Example 1;

[0030] Figure 7 This is an exploded view of the striking stirring device of Example 1;

[0031] In the figure: 10, sand-falling machine; 20, conveyor; 30, striking stirring device; 301, regeneration bin; 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, passive gear; 305, stirring frame; 3051, sieve plate; 3052, annular Frame; 3053, wheel frame; 3054, supporting wheel; 3055, inner gear ring; 3056, transmission shaft; 306, mixing drum; 3061, spiral blade; 3062, through hole; 3063, connecting column; 3064, outer gear ring; 307, mixing column; 3071, track; 3072, extension rod; 30721, square head; 308, mixing blade; 3081, connecting rod; 3082, striking tooth. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that these descriptions are only illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0033] Example 1

[0034] Highly disintegrating water glass used sand regeneration and recycling device, such as Figure 1-7 As shown, including:

[0035] The regeneration bin 301 has a cavity, a lower discharge port 303 is provided on the lower side wall of the cavity, 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;

[0036] The striking stirring device 30 is arranged in the cavity, and 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 rotatably arranged on the stirring frame 305 through a 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, and 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, and the bottom end of the extension rod 3072 has a square head 30721 and is provided on the regeneration chamber 301 There is a limit structure for inserting the square head 30721 to limit the rotation of the extension rod 3072. A plurality of tracks 3071 are provided on the stirring column 307. The tracks 3071 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. The tracks 3071 are sinusoidal waveform structures after being unfolded. 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. A plurality of tracks 3071 are provided at different heights, and each track 3071 is provided with a plurality of stirring blades 308.

[0037] The driving device 304 is arranged outside the regeneration bin 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 and at the same time generate friction between the old sands.

[0038] Preferably, a sand shakeout machine 10 is also included, which is arranged at the head end of the conveyor 20 and is used to vibrate and break the sand blocks produced by casting.

[0039] Preferably, a conveyor 20 is further included, which is connected to the regeneration bin 301 and is used to convey the old sand into the regeneration bin 301 .

[0040] Preferably, a spiral 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 an upper cover can be provided on the top of the regeneration bin 301 to prevent gas from overflowing, and the discharge port of the spiral feeder penetrates the upper cover and extends into the regeneration bin 301.

[0041] 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, the stirring drum 306 is connected to the transmission shaft 3056, 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 connecting the inner and outer cavities 3013, the internal stirring device is located in the inner cavity 3012, the bottom of the stirring drum 306 and the bottom of the regeneration bin 301 have a gap, and the outer wall of the stirring drum 306 has a spiral blade 3061.

[0042] Preferably, a plurality of connecting columns 3063 are provided on the mixing drum 306 , an outer gear ring 3064 is provided at the inner end of the connecting column 3063 , an inner gear ring 3055 is provided on the transmission shaft 3056 , and the inner gear ring 3055 and the outer gear ring 3064 are meshed.

[0043] Preferably, an annular screen plate 3051 is provided on the transmission shaft 3056. The annular screen plate 3051 is provided with a plurality of screen holes, the aperture of which is smaller than the particle size of the old sand and larger than the particle size of the old sand after the film is removed. The annular screen plate 3051 is used to screen and allow particles with smaller particle sizes after the film is removed to pass through, while large particles are blocked at the top.

[0044] Preferably, the stirring frame 305 is a cylindrical structure that can prevent old sand from entering the track 3071. Each group of stirring blades 308 is provided with four and evenly distributed in a circular array. The edges of the stirring blades 308 are provided with striking teeth 3082. The top of the stirring frame 305 is provided with an annular frame 3052 with a material drop hole, and the annular frame 3052 is provided with a plurality of wheel frames 3053. The wheel frames 3053 are provided with support wheels 3054. The side wall of the regeneration bin 301 is provided with an annular groove 3011 for the support wheels 3054 to extend into and move inside. The height of each position of the annular groove 3011 is the same. The cylindrical structure can block the old sand outside and prevent the old sand from entering the track 3071 and causing excessive resistance.

[0045] Preferably, the driving device 304 includes a driving motor 3041 , a driving gear 3042 is disposed at the output end of the driving motor 3041 , a passive gear 3043 is disposed at the outer end of the rotating shaft, and the driving gear 3042 is meshed with the passive gear 3043 .

[0046] Example 2

[0047] The high-disintegrability water glass used sand regeneration and reuse process is carried out using the high-disintegrability water glass used sand regeneration and reuse device described in Example 1, and comprises the following steps:

[0048] S1, vibration crushing: adding the water glass sand after casting into the sand shaker and vibrating and crushing it into old sand particles;

[0049] 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 at the same time, driven by the connecting rod, the old sand particles are rotated to rub and collide, so as 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 an open state, and the generated film material is discharged from the upper discharge port. After a period of discharge, continue to add materials. The added materials are large 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;

[0050] S3, secondary manufacturing: collecting the old sand discharged from the lower discharge port in step S2 as backing sand and mixing it with 20%-30% new sand to be used as raw material for manufacturing water glass sand.

[0051] The above is an introduction to the high-disintegrability water glass used sand regeneration and reuse device and process provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the present invention and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. Highly disintegrable water glass waste sand regeneration and recycling device, characterized in that: include: The regeneration bin has a cavity, a lower discharge port is arranged on the lower side wall of the cavity, an upper discharge port is arranged on the upper side wall of the cavity, and screens are arranged at the lower discharge port and the upper discharge port; The striking 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 rotatably arranged on the stirring frame through 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 rotatably cooperates 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 arranged 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 being unfolded, an L-shaped connecting rod is arranged at the inner end of the rotating shaft of the stirring blade, and a running wheel is arranged at the inner end of the connecting rod, the running wheel extends into the track and runs along the track when the stirring frame rotates to drive the stirring blade to rotate, and a plurality of tracks are arranged at different heights, and each track is provided with a plurality of stirring blades; The driving device is arranged outside the regeneration bin and is in driving connection with the striking device to drive the striking and stirring device to stir and strike.

2. The high-disintegrability water glass waste sand regeneration and recycling device according to claim 1 is characterized in that: It also includes a sand falling 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-disintegrability water glass waste sand regeneration and recycling 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-disintegrability water glass waste sand regeneration and recycling 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-disintegrability water glass waste sand regeneration and recycling device according to claim 1 is characterized in that: An external stirring device is also provided in the cavity, and the external stirring device 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, the bottom of the stirring drum has a gap with the bottom of the regeneration bin, and the outer wall of the stirring drum has spiral blades.

6. The high-disintegrability water glass waste sand regeneration and recycling device according to claim 5 is characterized in that: A plurality of connecting columns are arranged on the mixing drum, an outer gear ring is arranged at the inner end of the connecting column, an inner gear ring is arranged on the transmission shaft, and the inner gear ring is meshed with the outer gear ring.

7. The high-disintegrability water glass waste sand regeneration and recycling device according to claim 5 is characterized in that: An annular screen plate is arranged on the transmission shaft, and a plurality of screen holes are arranged on the annular screen plate. The aperture of the screen holes is smaller than the particle size of the old sand and larger than the particle size of the old sand after film removal.

8. The high-disintegrability water glass waste sand regeneration and recycling 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 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 a circular frame with a drop hole, and a number of wheel frames are provided on the circular frame. The wheel frames are provided with supporting wheels. The side walls of the regeneration bin are provided with annular grooves for the supporting wheels to extend into and move inside, and the heights of each position of the annular groove are the same.

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

10. A process for regenerating and reusing waste sand of high-disintegrability water glass, which is carried out by using the device for regenerating and reusing waste sand of high-disintegrability water glass according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, vibration crushing: adding the water glass sand after casting into the sand shaker 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 at the same time, driven by the connecting rod, the old sand particles are rotated to rub and collide, so as 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 an open state, and the generated film material is discharged from the upper discharge port. After a period of discharge, continue to add materials. The added materials are large 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 backing sand and mixing it with 20%-30% new sand to be used as raw material for manufacturing water glass sand.

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