Efficient precoated sand screening equipment and method

Abstract

The invention provides efficient precoated sand screening equipment and method, and belongs to the technical field of screening equipment.The efficient precoated sand screening equipment comprises a supporting frame and a screening device arranged at the upper end of the supporting frame, the screening device comprises a screening shell and at least two screening plates arranged in the screening shell, and the screening plates are arranged in parallel; a water cooling device is installed between the two screening plates, an air cooling device is further installed 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 at the top of the screening device, and cooling airflow is pumped in through the second air cooling pipe; and cooling air flow is sucked through negative pressure of the first air cooling pipe, and the cooling air flow directionally flows in the screening device to finish continuous air cooling of the precoated sand. According to the precoated sand screening device, precoated sand is efficiently cooled in the screening process, normal screening of the precoated sand is guaranteed, the screening efficiency of the precoated sand is improved, and efficient screening is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of screening equipment, and in particular to a highly efficient screening equipment and method for coated sand. Background Art

[0002] The thermal processing of coated sand requires heating the raw sand and mixing it with raw materials such as resin and hexamethylenetetramine. Finally, it is cooled, crushed and screened to obtain the finished coated sand.

[0003] There is resin with a relatively low melting point on the surface of the coated sand. During the crushing and screening process, it needs to wait for it to cool down sufficiently before processing to avoid its surface melting, affecting the quality of the coated sand and clogging the equipment. Therefore, most of the existing equipment adds air cooling equipment in the screening equipment to cool the coated sand during the screening process.

[0004] The traditional cooling method is usually a single air cooling, and the cooling effect is limited. Moreover, due to the structure of the existing screening equipment, it is difficult to form a good sealing layer at the openings of the feeding device and the discharging device, and the cooling gas is difficult to flow in a predetermined trajectory in the screening equipment, and the predetermined cooling effect cannot be achieved, which affects the efficient screening of the coated sand. Summary of the invention

[0005] In response to the above problems, the present invention provides an efficient screening device and method for coated sand. The invention allows the coated sand to be efficiently cooled during the screening process, ensuring normal screening of the coated sand, improving the screening efficiency of the coated sand, and ensuring efficient screening.

[0006] To solve the above problems, the technical solution adopted by the present invention is: A highly efficient screening device for coated sand, comprising a support frame and a screening device arranged at the upper end of the support frame, the screening device comprising a screening shell and a screening plate arranged inside the screening shell, at least two screening plates are arranged in parallel, a water cooling device is installed between the two screening plates, and an air cooling device is also installed 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, a cooling air flow is pumped in through the second air cooling pipe, and the cooling air flow is sucked by the negative pressure of the first air cooling pipe, and the cooling air flow flows in a directional manner in the screening device to complete the continuous air cooling of the coated sand; a feeding device with a built-in first control valve group is arranged at the upper end of the screening device, a second discharging device with a built-in third gate plate is arranged on the side wall of the screening device, and a first discharging device with a built-in third control valve group is arranged at the lower end of the screening device, and in the process of screening the coated sand, the discharging rate of the first control valve group, the third gate plate and the third control valve group is controlled to be less than the feeding rate to form a flowing sealing structure on the inner side through the coated sand.

[0007] 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 inclination direction of the water cooling plates is opposite to the inclination direction of the screening plates. Water cooling pipes for circulating cooling liquid are embedded inside the water cooling plates.

[0008] Preferably, an inclined water-cooling baffle is fixed to the upper surface of the water-cooling plate, a first end of the water-cooling baffle is fixedly connected to the inner wall of the screening shell, and a second end of the water-cooling baffle is provided with a discharge notch for the coated sand to pass through.

[0009] Preferably, the second air cooling pipe is arranged at the first end of the water cooling baffle, and the direction of the end of the second air cooling pipe is consistent with the length direction of the water cooling baffle.

[0010] Preferably, the second discharging device includes a second discharging pipe, the third gate plate is arranged inside the second discharging pipe, a third discharging chamber for accommodating coated sand is formed on the inner side of the second discharging pipe, a detector for monitoring the sealed volume of the coated sand is arranged on the side wall of the third discharging chamber, and the detector is electrically connected to the third gate plate.

[0011] Preferably, the third gate plate 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, a first electric control device for driving the deflection angle of the control shaft is arranged on the outer side of the control shaft, and the first electric control device is electrically connected to the detector.

[0012] Preferably, the first discharge device includes a first discharge pipe, the third control valve group includes a first valve plate and a second valve plate arranged inside the first discharge pipe, the first valve plate and the second valve plate are arranged at intervals, a second discharge chamber is formed between the first valve plate and the second valve plate, and a first discharge chamber is formed on the inner side of the first valve plate.

[0013] Preferably, the feeding device comprises a feeding pipe, the first control valve group is arranged inside the feeding pipe, and a second electric control device for controlling the deflection of the first control valve group is arranged outside the feeding pipe.

[0014] A method for efficiently screening coated sand, using the above-mentioned efficient screening equipment for coated sand, comprises the following steps: S1, feeding the coated sand to be screened from a feeding device into a screening device, controlling the overall vibration of the screening device to complete the screening of the coated sand through the internal screening plate; S2, in the process of screening the coated sand, controlling the discharge rate of the first control valve group, the third gate plate and the third control valve group to be less than the feed rate, so as to form a flowing sealing structure on the inside through the coated sand; S3, pumping in a cooling airflow through the second air-cooling pipe, absorbing the cooling airflow through the negative pressure of the first air-cooling pipe, and directing the cooling airflow in the screening device to complete the continuous air cooling of the coated sand; controlling the directional flow of the cooling liquid in the water-cooling device to complete the continuous water cooling of the coated sand.

[0015] The beneficial effects of the present invention are: Through the above-mentioned structural design, the water-cooling and air-cooling structures can enhance the cooling effect of the coated sand, so that the coated sand can be efficiently cooled during the screening process, ensuring normal screening of the coated sand, improving the screening efficiency of the coated sand, and ensuring efficient screening; at the same time, during the normal screening process, the coated sand can be used to form a relatively sealed structure on the inner side of the feed and discharge structure, ensuring the normal flow of cooling gas in the screening device for efficient air cooling, further improving the overall cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 2 For the present invention Figure 1 Schematic diagram of the top view structure.

[0018] Figure 3 For the present invention Figure 1 Schematic diagram of the main structure.

[0019] Figure 4 It is a schematic diagram of the internal cross-sectional structure of the present invention.

[0020] Figure 5 For the present invention Figure 4 A is an enlarged structural diagram of FIG.

[0021] Figure 6 For the present invention Figure 4 Schematic diagram of the enlarged structure at B.

[0022] Figure 7 For the present invention Figure 4 Enlarged structural diagram at C.

[0023] In the figure: 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 discharging device; 510, first discharging pipe; 520, first valve plate; 521, first discharging chamber; 530, second valve plate; 531, second discharging chamber; 600, second discharging device; 610, second discharging pipe; 620, third gate plate; 621, control shaft; 622, control baffle; 630, detector; 640, third discharging chamber; 700, water cooling device; 710, water cooling plate; 720, water cooling baffle. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0025] In order to solve the problems mentioned in the background technology, Figure 1 -Attached Figure 7 A highly efficient screening device for coated sand comprises a support frame 100 and a screening device 200 arranged at the upper end of the support frame 100, the screening device 200 comprises a screening shell 210 and a screening plate 220 arranged inside the screening shell 210, the coated sand enters the screening shell 210 from the upper end and falls onto the upper end surface of the screening plate 220, and the screening of the coated sand is completed during the continuous vibration of the screening plate 220, and the large-sized agglomerated coated sand and the normal-sized coated sand are separated.

[0026] In order to be able to further accurately screen the coated sand, there are at least two screening plates 220 arranged in parallel, and a water cooling device 700 is installed between the two screening plates 220. The coated sand after one screening can contact 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 to prevent it from melting, thereby ensuring efficient screening of the coated sand.

[0027] At the same time, through the above-mentioned 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 and efficient cooling at the same time, which shortens the intermediate waiting time in the production process of the coated sand and greatly improves the efficiency of the coated sand processing and production.

[0028] Specifically, the air cooling device 400 includes a second air cooling pipe 420 arranged on the side wall of the screening device 200 and a first air cooling pipe 410 arranged on the top of the screening device 200. The cooling air flow is pumped in through the second air cooling pipe 420, and the cooling air flow is sucked in by the negative pressure of the first air cooling pipe 410. The cooling air flow flows in a directional manner in the screening device 200 to complete the continuous air cooling of the coated sand. The first air cooling pipe 410 can be located at the top to continuously extract the cooling gas, and the second air cooling pipe 420 can be located at the side wall to pump in the cooling gas, and the cooling gas can pass through the coated sand being screened and blown out from the top.

[0029] In order to ensure the overall sealing of the screening device 200 and control the cooling gas to flow in an efficient and concentrated manner, a feeding device 300 with a built-in first control valve group 320 is provided at the upper end of the screening device 200, a second discharging device 600 with a built-in third gate plate 620 is provided on the side wall of the screening device 200, and a first discharging device 500 with a built-in third control valve group is provided at the lower end of the screening device 200. In the process of screening the coated sand, the discharge rate of the first control valve group 320, the third gate plate 620 and the third control valve group is controlled to be lower than the feed rate, so that a flowing sealing structure is formed on the inside through the coated sand. Since the discharge rate of the coated sand is lower than the entry rate, the accumulation of coated sand behind the corresponding valve group can form a relative sealing structure. The coated sand of a certain thickness can prevent the entry of gas outside the valve group, so that the cooling gas can flow in a direction under the action of negative pressure, thereby further ensuring the air cooling effect.

[0030] It should be noted that after a sealing structure of coated sand with a certain thickness is formed on the inner side of the corresponding valve group, controlling its discharge rate to be equal to the feed rate can avoid continuous accumulation of coated sand on the inner side of the valve group, thereby ensuring a certain overall sealing performance and avoiding continuous accumulation of coated sand, which would affect the normal screening process.

[0031] In summary, through the above-mentioned structural design, through the water cooling and air cooling structure, the cooling effect of the coated sand can be enhanced, so that the coated sand can be efficiently cooled during the screening process, ensuring the normal screening of the coated sand, improving the screening efficiency of the coated sand, and ensuring efficient screening; at the same time, in the normal screening process, the coated sand can be used to form a relatively sealed structure on the inner side of the feed and discharge structure, ensuring the normal flow of the cooling gas in the screening device 200 for efficient air cooling, further improving the overall cooling effect.

[0032] Specifically, the water cooling device 700 includes a plurality of water cooling plates 710, the water cooling plates 710 are installed between the two screening plates 220, the water cooling plates 710 are arranged obliquely and the inclination direction of the water cooling plates 710 is opposite to the inclination direction of the screening plates 220, and the specific details can be referred to in the attached Figure 6The screening plate 220 is inclined toward the left direction, and the water cooling plate 710 is inclined toward the right direction. A water cooling pipe for circulating cooling liquid is embedded in the water cooling plate 710.

[0033] The coated sand first falls to the upper end of the screening plate 220 and is screened once. Part of the coated sand passes through the first layer of screening plate 220 and falls to the upper surface of the water-cooled plate 710. During the vibration, it moves along the water-cooled plate 710 and is efficiently cooled at the upper end of the water-cooled plate 710. After being cooled by the water-cooled plate 710, the coated sand finally falls to the surface of the screening plate 220 for secondary screening.

[0034] The water cooling devices 700 here can be arranged in multiple groups along the length direction of the screen plate 220. The multiple groups of water cooling devices 700 can efficiently cool the coated sand at different positions to reduce the overall temperature.

[0035] It should be noted that part of the coated sand falls directly from the first layer of screen plate 220 to the surface of the second layer of screen 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 liquid-cooled to lower the overall temperature and ensure that the coated sand as a whole is within a relatively normal temperature.

[0036] An inclined water-cooling baffle 720 is fixed to the upper surface of the water-cooling plate 710, and the first end of the water-cooling baffle 720 is fixedly connected to the inner wall of the screening shell 210, and the second end of the water-cooling baffle 720 is provided with a discharge notch for the coated sand to pass through. The coated sand falls to the upper end of the water-cooling plate 710, and the inclined water-cooling baffle 720 can shield the coated sand and reduce its downward movement rate. In this process, the water-cooling pipe in the water-cooling plate 710 can further efficiently contact cool this part of the coated sand, thereby greatly reducing the temperature of this part of the coated sand.

[0037] The water cooling pipe here can extend to the inside of the water cooling baffle 720, which increases the water cooling contact area and further improves the water cooling effect; the cooled coated sand is finally discharged from the unloading gap at the end to ensure the normal progress of the whole process.

[0038] Here, the second air-cooling pipe 420 is arranged at the first end of the water-cooling baffle 720, and the end of the second air-cooling pipe 420 is oriented in the same direction as the length of the water-cooling baffle 720. Through the above-mentioned structural design, the cooling gas blown out through the second air-cooling pipe 420 can blow part of the coated sand retained on the inner side of the water-cooling baffle 720 to ensure its normal movement and 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.

[0039] Please refer to the attached Figure 5The second discharging device 600 includes a second discharging pipe 610, and a third gate plate 620 is arranged inside the second discharging pipe 610. A third discharging chamber 640 for accommodating coated sand is formed on the inner side of the second discharging pipe 610. A detector 630 for monitoring the sealed volume of the coated sand is arranged on the side wall of the third discharging chamber 640, and the detector 630 is electrically connected to the third gate plate 620.

[0040] The third gate plate 620 can be used to control the discharge rate of the coated sand. During the screening process, a certain amount of coated sand is accumulated in the third discharge chamber 640 to form a sealing structure, thereby preventing gas from entering therefrom. The detector 630 can detect the thickness of the accumulated coated sand. When the thickness exceeds the set threshold, the opening of the third gate plate 620 is controlled to become larger, thereby increasing the discharge rate of the coated sand and ensuring the sealing effect and the orderly progress of normal screening.

[0041] The detector 630 here can be selected as an existing laser detection element. When the amount of coated sand accumulated is too much, a shielding structure is formed outside the detector 630, affecting the normal transmission and reception of the laser signal, thereby realizing rapid detection of the thickness of the coated sand.

[0042] 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, and a first electric control device for driving the deflection angle of the control shaft 621 is arranged on the outer side of the control shaft 621. The first electric control device is electrically connected to the detector 630. The first electric control device here can be selected to be controlled by 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.

[0043] 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 arranged 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, and a first discharge chamber 521 is formed on the inner side of the first valve plate 520.

[0044] In some screening situations, it is necessary to completely close the bottom of the first discharge pipe 510. The first discharge pipe 510 contains the smallest coated sand, and the traditional single-layer sealing structure cannot provide a good sealing effect. By setting a 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 be used to perform a seal in the first discharge pipe 510 first, thereby reducing the amount of coated sand discharged. After stabilization, the second valve plate 530 can be used to form a secondary seal on the inner side of the first discharge pipe 510, thereby forming a good airtight structure, solving the problem of particle blockage, and ensuring the normal operation of gas sealing.

[0045] The feeding device 300 here includes a feeding pipe 310, a first control valve group 320 is arranged inside the feeding pipe 310, and a second electric control device for controlling the deflection of the first control valve group 320 is arranged on the outside of the feeding pipe 310. Similarly, the first control valve group 320 can be controlled to be deflected by the second electric control device. After the first control valve group 320 is deflected, the opening size can be controlled to allow the unscreened coated sand to form a relative sealing structure in the feeding pipe 310, thereby ensuring the air cooling effect of the air cooling device 400.

[0046] A method for efficiently screening coated sand, using the above-mentioned efficient screening device for coated sand, comprises 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 to complete the screening of the coated sand through the internal screening plate 220; the larger blocky coated sand is discharged from the second discharging device 600 on the outside, and is subsequently further crushed, and the smaller coated sand is discharged from the first discharging device 500 at the bottom.

[0047] S2. During the screening of the coated sand, the discharge rate of the first control valve group 320, the third gate plate 620 and the third control valve group is controlled to be lower than the feed rate, so as to form a flowing sealing structure on the inside through the coated sand; by forming a flowing sealing structure, it is possible to prevent the outside gas from entering the inside of the screening device 200, so that the cooling gas can flow in a predetermined path in the screening device 200, thereby ensuring the normal and stable operation of the air cooling and improving the air cooling effect.

[0048] S3. The cooling air flow is pumped in through the second air-cooling pipe 420, and the cooling air flow is sucked in by the negative pressure of the first air-cooling pipe 410. The cooling air flow flows in a directional manner in the screening device 200 to complete the continuous air cooling of the coated sand. The directional flow of the cooling liquid in the water-cooling device 700 is controlled to complete the continuous water cooling of the coated sand. Under the dual effects of air cooling and water cooling, the coated sand screened in the screening device 200 can be efficiently cooled to prevent its temperature from exceeding the rated temperature, thereby ensuring the normal and efficient overall screening.

[0049] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A highly efficient screening device for coated sand, comprising a support frame (100) and a screening device (200) arranged at the upper end of the support frame (100), wherein the screening device (200) comprises a screening shell (210) and a screening plate (220) arranged inside the screening shell (210), characterized in that: At least two screening plates (220) are arranged in parallel, 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) comprises a second air cooling pipe (420) arranged on the side wall of the screening device (200) and a first air cooling pipe (410) arranged on the top of the screening device (200), a cooling air flow is pumped in through the second air cooling pipe (420), the cooling air flow is sucked in by negative pressure through the first air cooling pipe (410), and the cooling air flow flows in a directional manner in the screening device (200) to complete continuous air cooling of the coated sand; The upper end of the screening device (200) is provided with a feeding device (300) with a built-in first control valve group (320), the side wall of the screening device (200) is provided with a second discharging device (600) with a built-in third gate plate (620), and the lower end of the screening device (200) is provided with a first discharging device (500) with a built-in third control valve group. During the screening of coated sand, the first control valve group (320), the third gate plate (620) and the third control valve group are controlled to have a discharging rate lower than a feeding rate, so that a flowing sealing structure is formed on the inner side through the coated sand.

2. The high-efficiency screening equipment for coated sand according to claim 1 is characterized in that: The water cooling device (700) comprises a plurality of water cooling plates (710), wherein the water cooling plates (710) are installed between two screening plates (220), the water cooling plates (710) are arranged tilted and the tilting direction of the water cooling plates (710) is opposite to the tilting direction of the screening plates (220), and a water cooling pipe for circulating cooling liquid is embedded inside the water cooling plates (710).

3. The high-efficiency screening equipment for coated sand according to claim 2 is characterized in that: An inclined water-cooling baffle (720) is fixed to the upper surface of the water-cooling plate (710); a first end of the water-cooling baffle (720) is fixedly connected to the inner wall of the screening shell (210); and a discharge notch for the coated sand to pass through is provided at the second end of the water-cooling baffle (720).

4. The high-efficiency screening equipment for coated sand according to claim 3 is characterized in that: The second air cooling pipe (420) is arranged at the first end of the water cooling baffle (720), and the direction of the end of the second air cooling pipe (420) is consistent with the length direction of the water cooling baffle (720).

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

6. The high-efficiency screening equipment for coated sand according to claim 5, 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 to the side wall of the control shaft (621), and a first electric control device for driving the deflection angle of the control shaft (621) is arranged on the outer side of the control shaft (621), and the first electric control device is electrically connected to the detector (630).

7. 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) arranged inside the first discharge pipe (510), the first valve plate (520) and the second valve plate (530) are arranged at intervals, a second discharge chamber (531) is formed between the first valve plate (520) and the second valve plate (530), and a first discharge chamber (521) is formed on the inner side of the first valve plate (520).

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

9. A method for efficiently screening coated sand, characterized in that: The highly efficient screening device for coated sand according to any one of claims 1 to 8 comprises the following steps: S1, feeding the coated sand to be screened from the feeding device (300) into the screening device (200), and controlling the entire screening device (200) to vibrate to complete the screening of the coated sand through the internal screening plate (220); S2, in the process of screening the coated sand, controlling the first control valve group (320), the third gate plate (620) and the third control valve group to have a discharge rate lower than a feed rate so as to form a flow sealing structure on the inner side through the coated sand; S3, pumping cooling air through the second air cooling pipe (420), sucking the cooling air through the first air cooling pipe (410) under negative pressure, and directing the cooling air in the screening device (200) to achieve continuous air cooling of the coated sand; controlling the directional flow of cooling liquid in the water cooling device (700) to achieve continuous water cooling of the coated sand.

Images