CN212760973U - Foundry waste sand regenerating unit - Google Patents
Foundry waste sand regenerating unit Download PDFInfo
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- CN212760973U CN212760973U CN202021367687.XU CN202021367687U CN212760973U CN 212760973 U CN212760973 U CN 212760973U CN 202021367687 U CN202021367687 U CN 202021367687U CN 212760973 U CN212760973 U CN 212760973U
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Abstract
A casting waste sand regenerating device belongs to the field of casting waste sand regenerating equipment; it comprises a vibration grinding sieve separator and a dielectric barrier discharge plasma generator; the vibration grinding and screening device is connected with a dielectric barrier discharge plasma generator, the dielectric barrier discharge plasma generator is connected with a primary vibration film grinding device, the primary vibration film grinding device is connected with a sand film separator, the sand film separator is respectively connected with a typhoon eye generator, a typhoon eye wall generator and a reclaimed sand recovery device, and the reclaimed sand recovery device is respectively connected with a reclaimed sand recovery bin and a dust remover; the vibration grinding screening device, the dielectric barrier discharge plasma generator, the vibration film grinding device, the sand film separator, the typhoon eye generator, the typhoon eye wall generator, the reclaimed sand recovery device, the secondary vibration film grinding device and the recovery separation device are controlled by the control system to operate; the reclaimed sand recovery device is connected with the dust remover. The invention has short treatment period and high efficiency, and the resin consumption is less than that of new sand when the resin sand is coated with the film after regeneration.
Description
Technical Field
The invention relates to the field of waste sand regeneration for casting, in particular to a method and a device for regenerating waste sand for casting.
Background
90% of castings are produced by sand casting, 1 ton of qualified castings produced by sand casting needs about 1.3-1.5 tons of waste sand, and the waste sand discarded in China at least reaches more than 2000 million tons. At present, most of the waste sand is treated by adopting a centralized pit burying mode, occupies a large amount of land resources, pollutes underground water sources and causes great pressure on the environment. Under the condition that the environmental protection requirement is more and more strict, the waste sand problem becomes an urgent problem to be solved. Meanwhile, along with the gradual depletion of sand sources on the earth, the production cost of casting sand is higher and higher, and the benign sustainable development of the casting industry is severely restricted, so that the regeneration of waste sand is a good matter benefiting the nation and the people.
The existing waste sand regeneration method adopts a centrifugal impact method, a mechanical method or a heating method and the like. The methods have contradictions among the quality, the recovery rate and the operation cost of the reclaimed sand, and are difficult to popularize on a large scale. Therefore, the method for regenerating the waste foundry sand has low cost and simple process and is a difficult problem for the regeneration treatment of the waste sand for many years.
Disclosure of Invention
The invention provides a waste foundry sand regenerating device which is low in cost and simple in process.
A foundry waste sand regenerating device is characterized by comprising a vibration grinding screening device, a dielectric barrier discharge plasma generator, a primary vibration film grinding device, a sand film separator, a typhoon eye generator, a typhoon eye wall generator, a regenerated sand recovering device, a secondary vibration film grinding device, a recovering and separating device and a storage bin; the vibration grinding and screening device is connected with a dielectric barrier discharge plasma generator, the dielectric barrier discharge plasma generator is connected with a primary vibration film grinding device, the primary vibration film grinding device is connected with a sand film separator, the sand film separator is respectively connected with a typhoon eye generator, a typhoon eye wall generator and a reclaimed sand recovery device, and the reclaimed sand recovery device is respectively connected with a reclaimed sand recovery bin and a dust remover; the vibration grinding screening device, the dielectric barrier discharge plasma generator, the vibration film grinding device, the sand film separator, the typhoon eye generator, the typhoon eye wall generator, the reclaimed sand recovery device, the secondary vibration film grinding device and the recovery separation device are controlled by the control system to operate; the reclaimed sand recovery device is connected with the dust remover.
The dielectric barrier discharge plasma generator is arranged below, outside or beside the vibration grinding screening device; the reclaimed sand recovery device is connected with a sand outlet of the sand membrane separator through a pipeline, and the primary vibration membrane grinding device is arranged outside a sand outlet of the dielectric barrier discharge plasma generator and below a sand inlet of the sand membrane separator.
The dielectric barrier discharge plasma generator comprises a shell which is composed of an insulating plate shell and provided with a cavity, wherein one end of the shell is provided with a waste sand inlet, the other end of the shell is provided with a sand outlet, a high-voltage electrode and a grounding electrode are arranged outside the shell, and the high-voltage electrode is connected with a high-voltage power supply.
An abrasive column is arranged in the inner cavity of the sand membrane separator, and a waste sand inlet and a waste sand outlet are arranged in the shell of the sand membrane separator; the waste sand inlet is connected with the vibration film grinding device, and the waste sand outlet is connected with the reclaimed sand recovery device.
The reclaimed sand recovery device comprises a box body, the box body is provided with a sand inlet, a sand outlet and a dust exhaust port, and 20-mesh, 40-mesh, 70-mesh, 100-mesh, 140-mesh, 200-mesh and 260-mesh screens are sequentially arranged in the inner cavity of the box body at intervals.
The reclaimed sand and membrane inlet in the reclaimed sand recovery device is connected with the sand membrane separator by a pipeline, and the reclaimed sand outlet is downward and enters the hopper; the inert film and the dust separated from the regenerated sand are connected with a dust remover through a dust discharge port and a pipeline and discharged into the dust remover.
Furthermore, the vibrating grinding and screening device is filled with an abrasive for grinding the casting waste sand blocks into fine materials and separating metal materials.
Further, the dielectric barrier discharge plasma generator is used for generating plasma by using a dielectric barrier discharge system under normal pressure to decompose the inert organic film on the surface of the waste sand.
Furthermore, the vibration film grinding device is used for receiving the sand grains treated by the dielectric barrier discharge plasma generator, primarily separating the sand grains from the surface film by utilizing vibration friction and supplying sand for the sand film separator.
Further, the grinding material in the vibration film grinding device is used for colliding and rubbing with the sand column, and the inert film on the surface of the sand is separated from the sand grains in the flowing process of the sand column; and the sand grains in the sand column and the removed inert film flow out through the sand outlet.
Further, the typhoon eye wall generator is used to make the eye wall pressure around the typhoon eye in the sand membrane separator.
Furthermore, the reclaimed sand recovery device is used for separating reclaimed sand, an inert film and dust, discharging the reclaimed sand into a hopper for granularity grading and discharging the reclaimed sand for later use.
Further, the separated surface inert film and dust are recovered by a dust collector.
Further, the control system is under PLC control or AI control, and uniformly coordinates typhoon eye air pressure, typhoon eye wall air pressure, air speed, air quantity, vibration amplitude and vibration frequency, processing temperature, time and sand flow and on-off regulation of each link.
The shape of the dielectric barrier discharge plasma generator cavity comprises a square or rectangular or trapezoid, the length of the square or rectangular or trapezoid is 50 mm-500 mm, the width of the square or rectangular or trapezoid is 50 mm-500 mm, and the height of the square or rectangular or trapezoid is 50 mm-500 mm; the waste sand inlet is 30 mm-200 mm long, 30 mm-200 mm wide and 30 mm-200 mm high; the length of the waste sand outlet is 30 mm-200 mm, and the width is 30 mm-200 mm.
The vibration film grinding device is a VB type vibration grinding machine or a VB-F type environment-friendly vibration grinding machine or a BL type magnetic grinding machine or a VB-C horizontal vibration grinding machine of Baozhen grinding machinery Limited company of Dongguan city.
The sand film separator is a cavity with a cavity and an upper opening and a lower opening, and is provided with a waste sand inlet, a waste sand outlet, a typhoon eye wall generator interface and a typhoon eye generator interface; the cavity shape includes a cylinder or a square or a rectangle or a trapezoid. The sand membrane separator is 50 mm-1500 mm long, 50 mm-1500 mm wide and 50 mm-3000 mm high; the waste sand inlet is 30 mm-200 mm long, 30 mm-200 mm wide and 30 mm-200 mm high; the waste sand outlet is 30 mm-200 mm long, 30 mm-200 mm wide and 30 mm-200 mm high; the material is carbon steel or stainless steel or aluminum alloy. Be equipped with 3~20 abrasive column in the cavity, abrasive column cross section is 4mm ~6mm for length, and the width is 4mm ~6mm, and upper and lower and cavity wall connection distribute in cavity wall periphery or middle. The abrasive columns are distributed on the periphery or the middle of the cavity wall, so that the abrasive is fully contacted with the waste sand, a high-speed flow state sand column is formed, and the sand speed is ensured to be 15-70 m/s.
The reclaimed sand recovery device is a box body made of one or two of stainless steel, steel or aluminum, the length is 100-5000 mm, the width is 100-5000 mm, and the height is 100-5000 mm; the raw sand recovery device carries out granularity grading on the reclaimed sand, and the reclaimed sand is respectively collected into corresponding bins, and the sand number is arranged in sequence from small to large and is freely combined. The reclaimed sand recovery device is provided with a sand and membrane inlet, a reclaimed sand outlet and a dust discharge port which are treated by a sand membrane separator.
The vibrating grinding and screening device is internally provided with an abrasive material which is made of any one or a combination of more of corundum, diamond, CNB, garnet, olivine, walnut shell, silica, agate, silicon carbide and boron carbide; the shape of the vibrating grinding screen is any one or a combination of more than one of a square, a triangle, a sphere or a cylinder, the size of the vibrating grinding screen is 3 mm-200 mm, and the total amount of the vibrating grinding screen accounts for 1-60% of the volume of the vibrating grinding screen; the total amount accounts for 20-40% of the volume of the vibration grinding and screening device; the vibration mode adopts a vortex mode, a linear mode, a jigging mode or a rotation mode, and the power is 50-50000W; the vibration frequency is 6-700 times/min, and the amplitude is 2-50 mm.
The power of the dielectric barrier discharge plasma generator is 150W-50000W, the frequency is 10 Hz-6 GHz, and the voltage is 1.0-70 KV. After the waste sand enters the dielectric barrier discharge plasma generator, organic matter molecules in the inert film are in collision reaction with high-energy electrons, free radicals and excited particles, the decomposition is carried out rapidly, the bonding strength and the damage speed are greatly reduced, meanwhile, the temperature of the sand grains is increased to 70-900 ℃ by energy released by the reaction, and the treatment time is 0.5-50 min.
The vibration membrane grinder is internally provided with an abrasive material which is made of any one or a combination of more of corundum, diamond, CNB, garnet, olivine, walnut shell, silica, agate, silicon carbide and boron carbide; the shape of the vibrating membrane grinder is any one or combination of more than one of a square, a triangle, a sphere or a cylinder, the size of the vibrating membrane grinder is 3 mm-50 mm, and the total amount of the vibrating membrane grinder accounts for 1-60% of the volume of the vibrating membrane grinder; the vibration mode adopts a vortex mode or a linear mode, the vibration frequency is 10-600 times/minute, and the amplitude is 1-10 mm.
The typhoon eye generator is used for manufacturing typhoon eye air pressure in the sand membrane separator, the central air pressure of waste sand inlet wind eyes is controlled to be 750-1000 kPa, the diameter of the wind eyes is controlled to be phi 15-phi 1000mm, and the power is 200-50000W.
The typhoon eye wall generator controls the air pressure of an eye wall in the sand film separator to be 1013-1105 kPa, if the air pressure is too small, the typhoon eye and the typhoon eye wall cannot be formed, the air pressure is too large, the movement speed of sand grains in the flow state sand column is too high, and the diameter of the flow state sand column is too large; the wind speed is controlled to be 20 m/s-200 m/s.
After the reclaimed sand and the film enter the reclaimed sand recovery device, the sand grain speed is rapidly reduced to 1-5 m/s from 15-70 m/s, the sand grains settle into the reclaimed sand recovery device to become primary reclaimed sand, are sent into a reclaimed sand recovery bin, are sent into a secondary vibration film grinding device for secondary treatment, and enter a final-stage reclaimed sand recovery device after 3-5-stage treatment. Meanwhile, screens with different meshes are arranged in the reclaimed sand recovery device, and sand grains are classified and discharged into different bins; the separated inert film and dust are sent into a dust remover through a dust exhaust port;
the dust remover is connected with a reclaimed sand recovery device and is used for recovering the inert film and other dust; the dust remover is an electric dust remover or a bag type dust remover, the electric dust remover utilizes high-voltage discharge ionization to enrich dust on a dust collecting electrode substrate, and removes the dust regularly, the dust removal adopts a mechanical vibration type, a high-pressure airflow pulse impact type, and the power is 0.3 KW-50 KW; the multi-bag dust collector for the bag type dust collection adopts a pulse type dust collection mode, a back-flushing type dust collection mode and a mechanical vibration type dust collection mode, the quantity of the bags is determined according to the air quantity, and the bags are generally 16-64 bags.
The control system adopts a PLC or an expert control system, accurately controls and coordinates wind eye pressure, eye wall pressure, wind speed, wind quantity, vibration amplitude and vibration frequency, processing temperature, time and sand flow in the typhoon eye generator, and coordinates opening and closing of each link.
According to the invention, firstly, organic matters in the inert film on the surface of the waste sand are decomposed by using a dielectric barrier discharge plasma method, so that the binding force between the inert film on the surface of the waste sand and the raw sand is reduced; and then, a 'typhoon eye' and a 'typhoon eye wall' are manufactured by utilizing a sand film separator, so that waste sand naturally forms a fluid sand column around the 'typhoon eye' and along the 'typhoon eye wall', the waste sand collides and rubs with each other in the high-speed motion of the fluid sand column, the decomposed surface inert film is removed from the surface of the sand grain, an internal active film is reserved, the organic matter on the surface of the waste sand is removed while the granularity and the shape of the sand are maintained, and the active organic film or the active bentonite in the sand grain is reserved, thereby realizing the regeneration of the waste sand.
The invention has short treatment period and high efficiency, and the resin consumption is less than that of new sand when the resin sand is coated with the film after regeneration.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.
FIG. 2 is a schematic structural diagram of a dielectric barrier discharge plasma generator according to the present invention.
Fig. 3 is a cross-sectional view taken along a-a of fig. 1.
FIG. 4 is a schematic structural view of a sand membrane separator according to the present invention.
Fig. 5 is a schematic structural diagram of a reclaimed sand recovery device in the invention.
Fig. 6 is a view from the left of fig. 5B.
In the figure, 1, a control system, 2, a vibration grinding and screening device, 3, a dielectric barrier discharge plasma generator, 4, a vibration membrane grinding device, 5, a sand membrane separator, 6, a typhoon eye generator, 7, a typhoon eye wall generator, 8, a reclaimed sand recovery device, 9, a reclaimed sand recovery bin, 10, a dust remover, 11, purified gas evacuation, 12, a waste sand inlet, 13, a high-voltage electrode, 14, a high-voltage power supply, 15, the device comprises a sand outlet, 16, a grounding electrolysis unit, 17, an insulating plate, 18, a dielectric barrier plasma discharge cavity, 19, a sand inlet, 20, a typhoon eye wall generator inlet, 21, a sand membrane separator cavity, 22, an abrasive, 23, a typhoon eye generator inlet, 24, a regenerated sand membrane outlet, 25, a regenerated sand membrane inlet, 26, a regenerated sand separation unit, 27, a screen, 28, an inert membrane and dust outlet, 29 and a regenerated sand outlet.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, a foundry waste sand reclamation apparatus includes: a vibration grinding and screening device 2; a dielectric barrier discharge plasma generator 3; a vibrating membrane grinder 4; a sand membrane separator 5; a typhoon eye generator 6; a typhoon eye wall generator 7; a reclaimed sand recovery device 8; a reclaimed sand recovery bin 9; dust remover 10, control system 1.
The control system 1 respectively controls the vibration grinding screening device 2, the dielectric barrier discharge plasma generator 3, the vibration film grinding device 4, the sand film separator 5, the typhoon eye generator 6, the typhoon eye wall generator 7, the reclaimed sand recovery device 8 and the dust remover 10.
The vibrating grinding and screening device 2 is connected with a dielectric barrier discharge plasma generator 3, the dielectric barrier discharge plasma generator 3 is connected with a vibrating membrane grinding device 4, the vibrating membrane grinding device 4 is connected with a sand membrane separator 5, the sand membrane separator 5 is respectively connected with a typhoon eye generator 6, a typhoon eye wall generator 7 and a reclaimed sand recovery device 8, and the reclaimed sand recovery device 8 is respectively connected with a reclaimed sand recovery bin 9 and a dust remover 10.
Further, the dielectric barrier discharge plasma generator 3 is arranged at the lower part, the outer part or the side of the vibrating grinding and screening device 2; the reclaimed sand recovery device 8 is connected with a sand outlet of the sand membrane separator through a pipeline, and the vibration membrane grinder 4 is arranged outside a sand outlet of the dielectric barrier discharge plasma generator and below a sand inlet of the sand membrane separator; the dust remover 10 is connected with the reclaimed sand recovery device 8.
As shown in fig. 2 and 3, the dielectric barrier discharge plasma generator 3 includes a housing having a cavity and formed by an insulating plate housing, one end of the housing is provided with a waste sand inlet, the other end of the housing is provided with a sand outlet, a high voltage electrode and a grounding electrode are arranged outside the housing, and the high voltage electrode is connected to a high voltage power supply.
As shown in fig. 4, the sand film separator is externally connected with a typhoon eye wall generator interface, a typhoon eye generator interface, a waste sand inlet and a waste sand outlet; an abrasive column is arranged in a cavity of the sand membrane separator, a waste sand inlet is connected with the vibration membrane grinder, and a waste sand outlet is connected with a reclaimed sand recovery device.
As shown in fig. 5 and 6, the reclaimed sand recovery device comprises a box body, the box body is provided with a sand inlet, a sand outlet and a dust outlet, and the inner cavity of the box body is sequentially provided with 20-mesh, 40-mesh, 70-mesh, 100-mesh, 140-mesh, 200-mesh and 260-mesh screens at intervals.
The reclaimed sand treated by the sand membrane separator and the membrane enter from a sand inlet, the reclaimed sand is subjected to granularity classification by a screen and then is collected into respective bins through reclaimed sand outlets, and the sand number is arranged in sequence from small to large and is freely combined.
The sand inlet is connected with the sand membrane separator by a pipeline; the inert film and the dust separated from the regenerated sand are connected with a dust remover through a dust discharge port and a pipeline and discharged into the dust remover.
The typhoon eye generator is selected from a JZJX series Roots vane vacuum unit produced by Shanghai Feilu Pump science and technology Limited or a YX series vortex pump produced by Jiangsu full-wind environmental protection science and technology Limited.
The typhoon eye wall generator adopts an XQSHZ rotary blower or an XQSC200 multi-stage centrifugal blower or an XQSSR three-blade Roots blower produced by Shandong Xin Qian Shu machinery Limited.
The vibrating grinding and screening device adopts DZFS series linear vibrating screen or ZPS series straight-line vibrating screen or YA/YK series circular vibrating screen or ZSG mine vibrating screen or YTS series cylindrical rotary screen or SZZ self-centering vibrating screen produced by Dahan machinery.
The dust remover is selected from XKD and XWD series electric dust remover, BS780/930 series electric dust remover or JH and DJ type integrated high-voltage electrostatic dust remover produced by Yutai environmental protection machinery Limited company in Pond City; an HMC-120 type pulse single-machine bag type dust collector, an XMC type pulse bag type dust collector or an MC type pulse bag type dust collector produced by Yutai environmental protection machinery Co.
The control system adopts a PLC or an expert control system, and the PLC adopts an ohm dragon NX7 controller series, an NX1 controller series, an NX1P controller series, an NJ controller series, an industrial PC platform NY series or NX series I/O unit; the expert control system utilizes an expert control system, such as the Emerson Ovation expert control system.
Claims (5)
1. A foundry waste sand regenerating device is characterized by comprising a vibration grinding screening device, a dielectric barrier discharge plasma generator, a primary vibration film grinding device, a sand film separator, a typhoon eye generator, a typhoon eye wall generator, a regenerated sand recovering device, a secondary vibration film grinding device, a recovering and separating device and a storage bin; the vibration grinding and screening device is connected with a dielectric barrier discharge plasma generator, the dielectric barrier discharge plasma generator is connected with a primary vibration film grinding device, the primary vibration film grinding device is connected with a sand film separator, the sand film separator is respectively connected with a typhoon eye generator, a typhoon eye wall generator and a reclaimed sand recovery device, and the reclaimed sand recovery device is respectively connected with a reclaimed sand recovery bin and a dust remover; the vibration grinding screening device, the dielectric barrier discharge plasma generator, the vibration film grinding device, the sand film separator, the typhoon eye generator, the typhoon eye wall generator, the reclaimed sand recovery device, the secondary vibration film grinding device and the recovery separation device are controlled by the control system to operate; the reclaimed sand recovery device is connected with the dust remover.
2. The foundry waste sand reclamation apparatus of claim 1, wherein said dielectric barrier discharge plasma generator is mounted below, outside or adjacent to said vibratory grinding screen; the reclaimed sand recovery device is connected with a sand outlet of the sand membrane separator through a pipeline, and the primary vibration membrane grinding device is arranged outside a sand outlet of the dielectric barrier discharge plasma generator and below a sand inlet of the sand membrane separator.
3. The foundry waste sand reclamation device as recited in claim 1, wherein the dielectric barrier discharge plasma generator comprises a housing having a cavity and formed by an insulating plate housing, the housing having a waste sand inlet at one end and a sand outlet at the other end, a high voltage electrode and a ground electrode disposed outside the housing, the high voltage electrode being connected to a high voltage power supply.
4. The foundry waste sand regenerating device of claim 1, wherein the sand membrane separator is provided with an abrasive column in the inner cavity, and the sand membrane separator housing is provided with a waste sand inlet and a waste sand outlet; the waste sand inlet is connected with the vibration film grinding device, and the waste sand outlet is connected with the reclaimed sand recovery device.
5. The foundry waste sand regeneration device as defined in claim 1, wherein the reclaimed sand recovery device comprises a box body, the box body is provided with a sand inlet, a sand outlet and a dust outlet, and screens of 20 meshes, 40 meshes, 70 meshes, 100 meshes, 140 meshes, 200 meshes and 260 meshes are sequentially arranged in the inner cavity of the box body at intervals.
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| CN202021367687.XU CN212760973U (en) | 2020-07-13 | 2020-07-13 | Foundry waste sand regenerating unit |
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| CN202021367687.XU CN212760973U (en) | 2020-07-13 | 2020-07-13 | Foundry waste sand regenerating unit |
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| CN212760973U true CN212760973U (en) | 2021-03-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022011985A1 (en) * | 2020-07-13 | 2022-01-20 | 太原理工大学 | Foundry waste sand recycling method and device |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022011985A1 (en) * | 2020-07-13 | 2022-01-20 | 太原理工大学 | Foundry waste sand recycling method and device |
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