A coated sand high-efficiency screening device and method

Abstract

The application provides a coated sand high-efficiency screening device and method, and belongs to the technical field of screening devices, which comprises a supporting frame and a screening device arranged on the upper end of the supporting frame. The screening device comprises a screening shell and a screening plate arranged in the screening shell. The screening plate is arranged in at least two parallel modes. A water cooling device is arranged between the two screening plates. An air cooling device is further arranged on the inner wall of the screening device. The air cooling device comprises a second air cooling pipe arranged on the side wall of the screening device and a first air cooling pipe arranged on the top of the screening device. Cooling air is pumped into the second air cooling pipe, and the cooling air is sucked by the first air cooling pipe under negative pressure. The cooling air flows in the screening device in a directional mode to complete continuous air cooling of the coated sand. The application realizes high-efficiency cooling of the coated sand during screening, ensures normal screening of the coated sand, improves the screening efficiency of the coated sand, and ensures high-efficiency screening.

Description

Technical Field

[0001] This invention relates to the field of screening equipment technology, and in particular to a high-efficiency screening equipment and method for coated sand. Background Technology

[0002] The thermal processing of coated sand requires heating the raw sand and mixing it with raw materials such as resin and hexamethylenetetramine. Finally, the coated sand is obtained by cooling, crushing and screening.

[0003] The surface of coated sand contains resin with a relatively low melting point. During crushing and screening, it needs to be fully cooled before processing to prevent the surface from melting, which would affect the quality of the coated sand and prevent equipment blockage. Therefore, most existing equipment adds air-cooling devices to the screening equipment to cool the coated sand during the screening process.

[0004] Traditional cooling methods are usually simple air cooling, which has limited cooling effect. Furthermore, due to the structure of existing screening equipment, it is difficult to form a good sealing layer at the openings of the feeding and discharging devices. The cooling gas cannot flow in a predetermined direction within the screening equipment, thus failing to achieve the desired cooling effect and affecting the efficient screening of coated sand. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a high-efficiency screening device and method for coated sand. This invention enables efficient cooling of the coated sand during the screening process, ensuring normal screening of the coated sand, improving the screening efficiency of the coated sand, and guaranteeing high-efficiency screening.

[0006] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0007] A high-efficiency screening device for coated sand includes a support frame and a screening device disposed on the upper end of the support frame. The screening device includes a screening shell and screening plates disposed inside the screening shell. At least two screening plates are arranged side by side, and a water cooling device is installed between the two screening plates. An air cooling device is also installed on the inner wall of the screening device. The air cooling device includes a second air cooling pipe disposed on the side wall of the screening device and a first air cooling pipe disposed on the top of the screening device. Cooling airflow is pumped in through the second air cooling pipe and the first air cooling pipe is used to draw in the cooling airflow under negative pressure. The cooling airflow flows directionally within the screening device to continuously cool the coated sand. A feeding device with a built-in first control valve group is disposed at the upper end of the screening device. A second discharge device with a built-in third gate is disposed on the side wall of the screening device. A first discharge device with a built-in third control valve group is disposed at the lower end of the screening device. During the screening of the coated sand, the discharge rate of the first control valve group, the third gate, and the third control valve group is controlled to be less than the feeding rate so that the coated sand forms a flow sealing structure on the inside.

[0008] Preferably, the water-cooling device includes a plurality of water-cooling plates, which are installed between two screening plates. The water-cooling plates are arranged at an angle and the angle of the water-cooling plates is opposite to that of the screening plates. Water-cooling pipes for circulating cooling liquid are embedded inside the water-cooling plates.

[0009] Preferably, the upper surface of the water-cooled plate is fixed with an inclined water-cooled baffle, the first end of the water-cooled baffle is fixedly connected to the inner wall of the screening shell, and the second end of the water-cooled baffle is provided with a discharge notch for the coated sand to pass through.

[0010] Preferably, the second air-cooling pipe is disposed at the first end of the water-cooling baffle, and the end of the second air-cooling pipe is oriented in the same direction as the length of the water-cooling baffle.

[0011] Preferably, the second discharge device includes a second discharge pipe, the third gate is disposed inside the second discharge pipe, a third discharge chamber for containing coated sand is formed on the inner side of the second discharge pipe, and a detector for monitoring the sealed volume of the coated sand is disposed on the side wall of the third discharge chamber, the detector being electrically connected to the third gate.

[0012] Preferably, the third gate includes a control shaft rotatably connected to the inner wall of the second discharge pipe, a control baffle is fixed to the side wall of the control shaft, and a first electronic control device is provided on the outside of the control shaft to drive the deflection angle of the control shaft. The first electronic control device is electrically connected to the detector.

[0013] Preferably, the first discharge device includes a first discharge pipe, and the third control valve group includes a first valve plate and a second valve plate disposed inside the first discharge pipe. The first valve plate and the second valve plate are arranged at intervals, and a second discharge chamber is formed between the first valve plate and the second valve plate. A first discharge chamber is formed inside the first valve plate.

[0014] Preferably, the feeding device includes a feeding pipe, the first control valve group is disposed inside the feeding pipe, and a second electronic control device for controlling the deflection of the first control valve group is disposed outside the feeding pipe.

[0015] A method for high-efficiency screening of coated sand, using the aforementioned high-efficiency screening equipment for coated sand, includes the following steps: S1, feeding the coated sand to be screened into the screening device from the feeding device, controlling the overall vibration of the screening device to complete the screening of the coated sand through the internal screening plate; S2, during the screening of the coated sand, controlling the discharge rate of the first control valve group, the third gate, and the third control valve group to be less than the feeding rate, so that the coated sand forms a flow sealing structure on the inside; S3, pumping cooling airflow through the second air-cooling pipe, and drawing cooling airflow through the negative pressure of the first air-cooling pipe, the cooling airflow flows directionally within the screening device to complete the continuous air cooling of the coated sand; controlling the directional flow of cooling liquid in the water-cooling device to complete the continuous water cooling of the coated sand.

[0016] The beneficial effects of this invention are as follows:

[0017] Through the above structural design, the cooling effect of the coated sand can be enhanced by water cooling and air cooling, allowing the coated sand to be cooled efficiently during the screening process, ensuring normal screening of the coated sand, improving the screening efficiency, and guaranteeing high-efficiency screening. At the same time, during normal screening, the coated sand can form a relatively sealed structure on the inner side of the feeding and discharging structure, ensuring that the cooling gas flows normally in the screening device for efficient air cooling, further improving the overall cooling effect. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 For the present invention Figure 1 A top-view structural diagram.

[0020] Figure 3 For the present invention Figure 1 A schematic diagram of the main structure.

[0021] Figure 4 This is a schematic diagram of the internal cross-sectional structure of the present invention.

[0022] Figure 5 For the present invention Figure 4 A magnified structural diagram at point A.

[0023] Figure 6 For the present invention Figure 4 A magnified structural diagram at point B.

[0024] Figure 7 For the present invention Figure 4 A magnified structural diagram at point C.

[0025] In the diagram: 100, support frame; 200, screening device; 210, screening shell; 220, screening plate; 300, feeding device; 310, feeding pipe; 320, first control valve group; 400, air-cooling device; 410, first air-cooling pipe; 420, second air-cooling pipe; 500, first discharge device; 510, first discharge pipe; 520, first valve plate; 521, first discharge chamber; 530, second valve plate; 531, second discharge chamber; 600, second discharge device; 610, second discharge pipe; 620, third gate; 621, control shaft; 622, control baffle; 630, detector; 640, third discharge chamber; 700, water-cooling device; 710, water-cooling plate; 720, water-cooling baffle. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] To address the problems mentioned in the background art, see Appendix Figure 1 - Appendix Figure 7 A high-efficiency screening device for coated sand includes a support frame 100 and a screening device 200 disposed on the upper end of the support frame 100. The screening device 200 includes a screening shell 210 and a screening plate 220 disposed inside the screening shell 210. Coated sand enters the screening shell 210 from the upper end and falls onto the upper surface of the screening plate 220. The screening of the coated sand is completed during the continuous vibration of the screening plate 220, and large-sized clumps of coated sand are separated from normal-sized coated sand.

[0028] To enable more precise screening of the coated sand, at least two screening plates 220 are arranged side by side, with a water cooling device 700 installed between the two screening plates 220. The coated sand after one screening can come into contact with the water cooling device 700 to complete the water cooling of the coated sand. An air cooling device 400 is also installed on the inner wall of the screening device 200. The air cooling device 400 can control the directional flow of cooling gas inside the screening device 200 to achieve air cooling of the coated sand. The combination of air cooling and water cooling can efficiently cool the coated sand, prevent it from melting, and ensure the efficient screening of the coated sand.

[0029] Meanwhile, thanks to the above structural design, there is no need to worry about the temperature rise of the coated sand during the screening process. The coated sand with a certain temperature can be put into the screening device 200 for screening while being cooled efficiently, which shortens the intermediate waiting time in the coated sand production process and greatly improves the efficiency of coated sand processing and production.

[0030] Specifically, the air-cooling device 400 includes a second air-cooling pipe 420 disposed on the side wall of the screening device 200 and a first air-cooling pipe 410 disposed on the top of the screening device 200. Cooling airflow is pumped in through the second air-cooling pipe 420 and the cooling airflow is drawn in by negative pressure through the first air-cooling pipe 410. The cooling airflow flows directionally within the screening device 200 to continuously cool the coated sand. The first air-cooling pipe 410 can be located at the top to continuously extract cooling gas, and the second air-cooling pipe 420 can be located at the side wall to pump in cooling gas. The cooling gas can pass through the coated sand being screened and blow out from the top.

[0031] To ensure the overall sealing of the screening device 200 and to control the efficient and concentrated directional flow of cooling gas, a feeding device 300 with a built-in first control valve group 320 is installed at the upper end of the screening device 200, a second discharge device 600 with a built-in third gate 620 is installed on the side wall of the screening device 200, and a first discharge device 500 with a built-in third control valve group is installed at the lower end of the screening device 200. During the screening of coated sand, the discharge rate of the first control valve group 320, the third gate 620, and the third control valve group is controlled to be less than the feeding rate, so that the coated sand forms a flow sealing structure on the inside. Since the discharge rate of the coated sand is less than the inflow rate, the coated sand accumulates behind the corresponding valve group to form a relative sealing structure. A certain thickness of coated sand can prevent the entry of gas from the outside of the valve group, allowing the cooling gas to flow directionally under negative pressure, further ensuring the effect of air cooling.

[0032] It should be noted that after a certain thickness of coated sand sealing structure is formed inside the corresponding valve group, controlling its discharge rate to be equal to the feed rate can prevent the coated sand inside the valve group from continuously accumulating. This ensures a certain degree of overall sealing while preventing the coated sand from continuously accumulating and affecting the normal screening process.

[0033] In summary, the above structural design, through water cooling and air cooling, enhances the cooling effect of the coated sand, allowing it to be efficiently cooled during screening, ensuring normal screening and improving screening efficiency. Simultaneously, during normal screening, the coated sand forms a relatively sealed structure on the inner side of the feeding and discharging structures, ensuring the normal flow of cooling gas within the screening device 200 for efficient air cooling, further improving the overall cooling effect.

[0034] Specifically, the water-cooling device 700 includes a plurality of water-cooling plates 710, which are installed between two screening plates 220. The water-cooling plates 710 are arranged at an angle, and the angle of the water-cooling plates 710 is opposite to the angle of the screening plates 220. For details, please refer to the appendix. Figure 6The screening plate 220 is tilted to the left, the water-cooled plate 710 is tilted to the right, and the water-cooled plate 710 is embedded with a water-cooled pipe for circulating cooling liquid.

[0035] The coated sand first falls onto the upper end of the screening plate 220 and undergoes a first screening. Some of the coated sand passes through the first screening plate 220 and falls onto the upper surface of the water-cooled plate 710. During the vibration, it moves along the water-cooled plate 710 and is efficiently cooled on the upper end of the water-cooled plate 710. After being cooled by the water-cooled plate 710, the coated sand finally falls onto the surface of the screening plate 220 for a second screening.

[0036] The water cooling device 700 here can be arranged in multiple groups along the length of the screening plate 220. Multiple groups of water cooling devices 700 can efficiently cool the coated sand at different locations to reduce the overall temperature.

[0037] It should be noted that some of the coated sand falls directly from the first screening plate 220 to the surface of the second screening plate 220 without being cooled by the water cooling device 700. This part of the coated sand can be mixed with the coated sand that has been cooled by liquid, thereby reducing the overall temperature and ensuring that the overall coated sand is within a relatively normal temperature range.

[0038] An inclined water-cooled baffle 720 is fixed on the upper surface of the water-cooled plate 710. The first end of the water-cooled baffle 720 is fixedly connected to the inner wall of the screening shell 210, and the second end of the water-cooled baffle 720 is provided with a discharge notch for the coated sand to pass through. When the coated sand falls to the upper end of the water-cooled plate 710, the inclined water-cooled baffle 720 can block the coated sand and reduce its downward movement speed. During this process, the water-cooled pipes in the water-cooled plate 710 can further efficiently contact cool the coated sand, greatly reducing the temperature of the coated sand.

[0039] The water-cooling pipes here can extend into the interior of the water-cooling baffle 720, increasing the water-cooling contact area and further improving the water-cooling cooling effect; the cooled coated sand is finally discharged from the discharge gap at the end, ensuring the normal operation of the whole system.

[0040] Here, the second air-cooling pipe 420 is located at the first end of the water-cooling baffle 720, and the end of the second air-cooling pipe 420 is aligned with the length direction of the water-cooling baffle 720. Through the above structural design, the cooling gas blown out by the second air-cooling pipe 420 can blow the part of the coated sand remaining inside the water-cooling baffle 720, ensuring its normal movement to complete continuous screening. At the same time, under the dual action of gas and vibration, the coated sand can be cooled during the rolling process, further improving the cooling effect of the coated sand.

[0041] Please refer to the appendix for details. Figure 5The second discharge device 600 includes a second discharge pipe 610, a third gate 620 disposed inside the second discharge pipe 610, a third discharge chamber 640 for containing coated sand is formed inside the second discharge pipe 610, and a detector 630 for monitoring the sealed volume of coated sand is disposed on the side wall of the third discharge chamber 640, and the detector 630 is electrically connected to the third gate 620.

[0042] The third gate 620 controls the discharge rate of the coated sand, allowing a certain amount of coated sand to accumulate in the third discharge chamber 640 during the screening process to form a sealed structure, preventing gas from entering from there. The detector 630 detects the thickness of the coated sand accumulation. When the thickness exceeds a set threshold, the opening of the third gate 620 is increased to improve the discharge rate of the coated sand, ensuring the sealing effect and the orderly progress of normal screening.

[0043] The detector 630 here can be selected as an existing laser detection element. When the amount of coated sand accumulates to an excessive amount, it forms a blocking structure on the outside of the detector 630, affecting the normal transmission and reception of the laser signal, thus enabling rapid detection of the coating sand thickness.

[0044] Specifically, the third gate 620 includes a control shaft 621 rotatably connected to the inner wall of the second discharge pipe 610. A control baffle 622 is fixed to the side wall of the control shaft 621. A first electrical control device is provided on the outside of the control shaft 621 to drive the deflection angle of the control shaft 621. The first electrical control device is electrically connected to the detector 630. Here, the first electrical control device can be selected to control an existing motor. Driving the control shaft 621 to rotate can adjust the opening size of the control baffle 622 to realize opening and closing control.

[0045] The first discharge device 500 here includes a first discharge pipe 510, and the third control valve group includes a first valve plate 520 and a second valve plate 530 disposed inside the first discharge pipe 510. The first valve plate 520 and the second valve plate 530 are arranged at intervals, and a second discharge chamber 531 is formed between the first valve plate 520 and the second valve plate 530. The first discharge chamber 521 is formed inside the first valve plate 520.

[0046] In some screening cases, the bottom of the first discharge pipe 510 needs to be completely sealed. The inside of the first discharge pipe 510 contains the smallest coated sand, and the traditional single-layer sealing structure cannot achieve a good sealing effect. By setting the combination of the first valve plate 520 and the second valve plate 530, a double-layer sealing structure can be formed in the first discharge pipe 510. The first valve plate 520 can first seal the first discharge pipe 510, reducing the amount of coated sand discharged. After stabilization, the second valve plate 530 can form a secondary seal on the inside of the first discharge pipe 510, forming a good airtight structure, solving the problem of particle blockage, and ensuring the normal operation of the gas seal.

[0047] The feeding device 300 here includes a feeding pipe 310, a first control valve group 320 is disposed inside the feeding pipe 310, and a second electrical control device is disposed outside the feeding pipe 310 to control the deflection of the first control valve group 320. Similarly, the second electrical control device can control the deflection of the first control valve group 320. After the first control valve group 320 deflects, the opening size can be controlled so that the unscreened coated sand forms a relatively sealed structure inside the feeding pipe 310, thus ensuring the air cooling effect of the air cooling device 400.

[0048] A method for high-efficiency screening of coated sand, using the aforementioned high-efficiency screening equipment for coated sand, includes the following steps:

[0049] S1. The coated sand to be screened is fed into the screening device 200 from the feeding device 300. The screening device 200 is controlled to vibrate as a whole and the coated sand is screened by the internal screening plate 220. Larger pieces of coated sand are discharged from the second discharge device 600 on the outside and will be further crushed. Smaller pieces of coated sand are discharged from the first discharge device 500 at the bottom.

[0050] S2. During the screening of coated sand, the discharge rate of the first control valve group 320, the third gate 620 and the third control valve group is controlled to be less than the feed rate, so that the coated sand forms a flow sealing structure on the inside. By forming a flow sealing structure, the gas on the outside can be prevented from entering the screening device 200, and the cooling gas can flow in a predetermined direction within the screening device 200, ensuring the normal and stable operation of air cooling and improving the air cooling effect.

[0051] S3. Cooling airflow is pumped in through the second air-cooling pipe 420, and the cooling airflow is drawn in by negative pressure through the first air-cooling pipe 410. The cooling airflow flows directionally within the screening device 200 to continuously cool the coated sand. The cooling liquid in the water-cooling device 700 is controlled to flow directionally to continuously cool the coated sand. Under the dual action of air cooling and water cooling, the coated sand screened in the screening device 200 can be efficiently cooled, preventing its temperature from exceeding the rated temperature and ensuring the normal and efficient operation of the overall screening.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-efficiency screening device for coated sand, comprising a support frame (100) and a screening device (200) disposed on the upper end of the support frame (100), wherein the screening device (200) comprises a screening shell (210) and a screening plate (220) disposed inside the screening shell (210), characterized in that: At least two screening plates (220) are arranged side by side, and a water cooling device (700) is installed between the two screening plates (220). An air cooling device (400) is also installed on the inner wall of the screening device (200). The air cooling device (400) includes a second air cooling pipe (420) disposed on the side wall of the screening device (200) and a first air cooling pipe (410) disposed on the top of the screening device (200). Cooling airflow is pumped in through the second air cooling pipe (420), and cooling airflow is drawn in by negative pressure through the first air cooling pipe (410). The cooling airflow flows in a direction within the screening device (200) to complete the continuous air cooling of the coated sand. The screening device (200) is equipped with a feeding device (300) with a built-in first control valve group (320) at its upper end, a second discharge device (600) with a built-in third gate (620) is provided on the side wall of the screening device (200), and a first discharge device (500) with a built-in third control valve group is provided at the lower end of the screening device (200). During the screening of coated sand, the discharge rate of the first control valve group (320), the third gate (620) and the third control valve group is controlled to be less than the feeding rate so that the coated sand forms a flow sealing structure on the inside. The water-cooling device (700) includes a plurality of water-cooling plates (710), which are installed between two screening plates (220). The water-cooling plates (710) are arranged at an angle and the angle of the water-cooling plates (710) is opposite to the angle of the screening plates (220). Water-cooling pipes for circulating cooling liquid are embedded inside the water-cooling plates (710). The upper surface of the water-cooled plate (710) is fixed with an inclined water-cooled baffle (720). The first end of the water-cooled baffle (720) is fixedly connected to the inner wall of the screening shell (210), and the second end of the water-cooled baffle (720) is provided with a discharge notch for the coated sand to pass through.

2. The high-efficiency screening equipment for coated sand according to claim 1, characterized in that, The second air-cooled pipe (420) is disposed at the first end of the water-cooled baffle (720), and the end of the second air-cooled pipe (420) is oriented in the same direction as the length of the water-cooled baffle (720).

3. The high-efficiency screening equipment for coated sand according to claim 1, characterized in that, The second discharge device (600) includes a second discharge pipe (610), and the third gate (620) is disposed inside the second discharge pipe (610). A third discharge chamber (640) for containing coated sand is formed on the inner side of the second discharge pipe (610). A detector (630) for monitoring the sealed volume of the coated sand is disposed on the side wall of the third discharge chamber (640). The detector (630) is electrically connected to the third gate (620).

4. The high-efficiency screening equipment for coated sand according to claim 3, characterized in that, The third gate (620) includes a control shaft (621) rotatably connected to the inner wall of the second discharge pipe (610). A control baffle (622) is fixed on the side wall of the control shaft (621). A first electrical control device is provided on the outside of the control shaft (621) to drive the deflection angle of the control shaft (621). The first electrical control device is electrically connected to the detector (630).

5. The high-efficiency screening equipment for coated sand according to claim 1, characterized in that, The first discharge device (500) includes a first discharge pipe (510), and the third control valve group includes a first valve plate (520) and a second valve plate (530) disposed inside the first discharge pipe (510). The first valve plate (520) and the second valve plate (530) are arranged at intervals, and a second discharge chamber (531) is formed between the first valve plate (520) and the second valve plate (530). The first discharge chamber (521) is formed inside the first valve plate (520).

6. The high-efficiency screening equipment for coated sand according to claim 1, characterized in that, The feeding device (300) includes a feeding pipe (310), the first control valve group (320) is disposed inside the feeding pipe (310), and a second electrical control device for controlling the deflection of the first control valve group (320) is disposed outside the feeding pipe (310).

7. A method for high-efficiency screening of coated sand, characterized in that, Using the high-efficiency screening equipment for coated sand according to any one of claims 1-6 includes the following steps: S1. The coated sand to be screened is fed into the screening device (200) from the feeding device (300), and the screening device (200) is controlled to vibrate as a whole through the internal screening plate (220) to complete the screening of the coated sand. S2. During the screening of coated sand, the discharge rate of the first control valve group (320), the third gate (620) and the third control valve group is controlled to be less than the feed rate so that the coated sand forms a flow sealing structure on the inside. S3. Cooling airflow is pumped in through the second air-cooling pipe (420), and cooling airflow is drawn in by the negative pressure through the first air-cooling pipe (410). The cooling airflow flows in a direction within the screening device (200) to complete the continuous air cooling of the coated sand. The cooling liquid in the water-cooling device (700) is controlled to flow in a direction to complete the continuous water cooling of the coated sand.

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