Pre-treatment device for molding sand

Abstract

This invention provides a pretreatment device for molding sand, relating to the technical field of casting molding material sorting equipment. The aim is to solve the technical problems of cumbersome operation and dust generation when separating multiple impurities from molding sand in existing technologies. The technical solution adopted is: a pretreatment device for molding sand, including a left-right extending cylinder, a closed vibrating feeder, a blower blowing air to the right inside the cylinder, and a drive mechanism for driving the blower to move left and right; an opening and closing mechanism is installed at the left end of the cylinder, and a dust filtering mechanism is installed at the right end; the bottom of the cylinder has a first hopper, a second hopper, a third hopper, and a fourth hopper arranged sequentially from left to right; a receiving channel is provided at the top of the left section of the cylinder, and a first electromagnet is installed thereon; the discharge port of the closed vibrating feeder is connected to the receiving channel through a corrugated pipe. This invention can simultaneously separate multiple impurities in molding sand without the need for secondary transfer of molding sand, making operation simpler; at the same time, this invention can also avoid dust pollution in the workshop.

Description

Technical Field

[0001] This invention relates to the field of equipment for sorting casting molding materials, specifically to a pretreatment device for molding sand. Background Technology

[0002] Molding sand, also known as casting sand, is a basic refractory material used in casting production to manufacture sand molds. Molding sand plays a crucial role in casting production; poor quality molding sand can account for 30% to 50% of total casting scrap. Molding sand mainly includes two categories: virgin sand and recycled sand. Virgin sand generates sand fragments and dust during long-distance transportation; while recycled sand, in addition to sand fragments and dust, is prone to being mixed with iron filings and large particles. To further improve the quality of molding sand and reduce casting defects, it is necessary to pre-treat the molding sand before making the sand molds to separate the mixed sand fragments, dust, iron filings, and large particles.

[0003] Current technology typically uses magnetic separators to separate iron filings and vibrating screens to separate crushed sand and large particles. This requires secondary transfer and feeding of the molding sand, which is cumbersome. Furthermore, the molding sand contains relatively little iron filings, making it uneconomical to purchase a high-cost magnetic separator for pretreatment. In addition, vibrating screens generate dust during both adding and screening molding sand, causing pollution to the workshop; moreover, the screens require regular replacement, making maintenance troublesome. Summary of the Invention

[0004] The purpose of this invention is to provide a pretreatment device for molding sand, which can simultaneously separate crushed sand, dust, iron filings and large particulate impurities mixed in the molding sand, eliminating the need for secondary transfer of the molding sand and making operation simpler; in addition, the pretreatment device can also avoid dust pollution in the workshop, and there is no need to replace the screen, making maintenance more convenient.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A pretreatment device for molding sand includes: a cylinder extending in a left-right direction, a closed vibrating feeder located above the cylinder, a blower located inside the cylinder and blowing air to the right, and a drive mechanism for driving the blower to move left and right; an opening and closing mechanism is installed at the left end of the cylinder, and a dust filtering mechanism is installed at the right end; a first hopper, a second hopper, a third hopper, and a fourth hopper are arranged sequentially from left to right at the bottom of the cylinder, and the first hopper, the second hopper, the third hopper, and the fourth hopper are respectively provided with discharge ports and valves are installed; a receiving channel is provided at the top of the left section of the cylinder, and a first electromagnet is installed on the outside of the receiving channel; the first hopper is located directly below the receiving channel; the inlet of the closed vibrating feeder is provided with a sliding cover, and the outlet is connected to the receiving channel through a corrugated pipe.

[0007] Optionally, the drive mechanism includes: a guide rail extending in the left-right direction; a connecting shaft extending in the front-back direction is provided in the middle of the guide rail, and the cylinder wall of the cylinder is provided with a mounting hole, and the connecting shaft is mounted in the mounting hole through a first sealed bearing; the drive mechanism further includes: a drive unit that drives the guide rail to rotate around the connecting shaft to adjust the height of the left and right ends of the guide rail; the drive mechanism has two parts, front and rear, and the fan is provided with roller groups that limit the guide rail on the front and rear sides of its housing respectively.

[0008] Optionally, the driving unit includes: a second electromagnet that drives the guide rail to rise to the left and fall to the right, and a third electromagnet that drives the guide rail to fall to the left and rise to the right; the left and right ends of the guide rail are made of iron, the second electromagnet is distributed above the left end and below the right end of the guide rail, and the third electromagnet is distributed below the left end and above the right end of the guide rail.

[0009] Optionally, the second and third electromagnets each block the rotation trajectory at the end of the guide rail to limit the maximum rotation angle of the guide rail; the second and third electromagnets are each detachably mounted on the inner wall of the cylinder by bolts; the second and third electromagnets limit the roller assembly to prevent the roller assembly from dislodging from the end of the guide rail.

[0010] Optionally, the roller assembly includes: a plurality of upper rollers distributed in the left-right direction, and a plurality of lower rollers corresponding one-to-one with the upper rollers; the guide rail is sandwiched between the upper rollers and the lower rollers; the upper rollers are V-shaped wheels, and the upper surface of the guide rail is configured in a matching inverted V shape.

[0011] Optionally, the opening and closing mechanism includes: an air inlet plate installed at the left end of the cylinder, and a baffle plate rotatably connected to the air inlet plate; the air inlet plate has a plurality of first air inlets penetrating the left and right surfaces, and the baffle plate has a plurality of second air inlets penetrating the left and right surfaces; when the baffle plate rotates to the point where the first air inlets and the second air inlets are aligned one by one, the opening and closing mechanism is in the open state; when the baffle plate rotates to the point where the first air inlets and the second air inlets are misaligned, the opening and closing mechanism closes the left end of the cylinder.

[0012] Optionally, the wind deflector is located on the right side of the air inlet plate; the wind deflector is provided with a slot for the left end of one of the guide rails to be inserted; when the guide rail is driven by the second electromagnet to rise to the left and fall to the right, it drives the wind deflector to rotate until the first air inlet and the second air inlet are misaligned; when the guide rail is driven by the third electromagnet to fall to the left and rise to the right, it drives the wind deflector to rotate until the first air inlet and the second air inlet are aligned one by one.

[0013] Optionally, one of the air inlet plate and the air baffle plate is provided with a central axis extending in the left-right direction, and the other is provided with a central hole; the central axis is mounted on the central hole through a second sealed bearing.

[0014] Optionally, both the first and second air inlets are configured in a fan shape and are evenly distributed around the central axis.

[0015] Optionally, the dust filtration mechanism adopts a cyclone separator, and a cloth bag is installed at the air outlet of the cyclone separator.

[0016] The working principle of this invention is as follows: The opening and closing mechanism closes the left end of the cylinder; the fan moves to the right section of the cylinder and is activated, opening the feed inlet of the enclosed vibrating feeder. Airflow is then drawn in through the feed inlet, passes through the receiving channel, and exits through the dust filter mechanism at the right end of the cylinder. At this time, molding sand is fed into the enclosed vibrating feeder through the feed inlet; dust generated during the feeding process is drawn in and does not escape into the workshop. After feeding is complete, the sliding cover closes the feed inlet, the fan moves to the left end of the cylinder, and the opening and closing mechanism opens the left end of the cylinder. Airflow is then drawn in from the left end of the cylinder and exits through the dust filter mechanism at the right end of the cylinder. At this time, the first electromagnet is energized, and the enclosed vibrating feeder is activated, causing the molding sand to gradually slide into the receiving channel. Iron filings in the molding sand are adsorbed onto the inner wall of the receiving channel, while the remaining materials continue to enter the cylinder. Under the action of the airflow, large particles of impurities are thrown into the second hopper, the molding sand into the third hopper, and the crushed sand into the fourth hopper. Dust is carried by the airflow into the dust filtration mechanism and trapped there. In this way, various impurities are separated from the molding sand. Finally, by shutting down the enclosed vibrating feeder and the blower, and de-energizing the first electromagnet, the iron filings fall into the first hopper.

[0017] Therefore, the beneficial effects of this invention are: it can simultaneously separate crushed sand, dust, iron filings and large particulate impurities mixed in the molding sand, eliminating the need for secondary transfer of the molding sand and making the operation simpler; in addition, this invention can also avoid dust pollution in the workshop, and there is no need to replace the screen, making maintenance more convenient. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 A schematic diagram showing the sliding cover closing the feed inlet;

[0021] Figure 3 A schematic diagram showing the installation of a corrugated pipe between the receiving channel and the discharge port;

[0022] Figure 4 A schematic diagram showing the installation of the first electromagnet on the outside of the material receiving channel;

[0023] Figure 5 A schematic diagram showing a fan installed inside a cylinder;

[0024] Figure 6 A schematic diagram of a guide rail installed inside a cylinder;

[0025] Figure 7 This is a schematic diagram of the fan mounted on the guide rail;

[0026] Figure 8 This is an assembly diagram of the opening and closing mechanism;

[0027] Figure 9 This is a schematic diagram showing how the guide rail drives the baffle plate to rotate until the first air inlet and the second air inlet are aligned.

[0028] Figure 10 This is a schematic diagram showing how the guide rail drives the baffle plate to rotate so that the first air inlet and the second air inlet are offset.

[0029] Reference numerals: 1. Cylinder; 2. Enclosed vibrating feeder; 3. Fan; 4. Opening and closing mechanism; 5. Dust filtration mechanism; 6. First hopper; 7. Second hopper; 8. Third hopper; 9. Fourth hopper; 10. Receiving channel; 11. First electromagnet; 12. Feed inlet; 13. Sliding cover; 14. Discharge outlet; 15. Bellows; 16. Guide rail; 17. Connecting shaft; 18. Mounting hole; 19. Second electromagnet; 20. Third electromagnet; 21. Upper roller; 22. Lower roller; 23. Air inlet plate; 24. Baffle plate; 25. First air inlet; 26. Second air inlet; 27. Slot; 28. Central shaft; 29. ​​Central hole; 30. Second sealed bearing. Detailed Implementation

[0030] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0031] In the description of this invention, it should be understood that the terms "front," "rear," "left," "right," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the purpose of facilitating and simplifying the description of the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0035] Example 1

[0036] like Figures 1-5 As shown, this embodiment of the invention provides a pretreatment device for molding sand. The pretreatment device includes: a cylinder 1 extending in a left-right direction; a closed vibrating feeder 2 located above the cylinder 1; a blower 3 located inside the cylinder 1 and blowing air to the right; and a drive mechanism for moving the blower 3 left and right. An opening and closing mechanism 4 is installed at the left end of the cylinder 1, and a dust filtering mechanism 5 is installed at the right end. From left to right, the bottom of the cylinder 1 is provided with a first hopper 6, a second hopper 7, a third hopper 8, and a fourth hopper 9. Each of the first hopper 6, second hopper 7, third hopper 8, and fourth hopper 9 has a discharge port and is equipped with a valve. A receiving channel 10 is provided at the top of the left section of the cylinder 1, and a first electromagnet 11 is installed on the outside of the receiving channel 10. The first hopper 6 is located directly below the receiving channel 10. The inlet 12 of the closed vibrating feeder 2 is provided with a sliding cover 13, and the outlet 14 is connected to the receiving channel 10 via a corrugated pipe 15.

[0037] The specific implementation of the present invention is described below: The opening and closing mechanism 4 closes the left port of the cylinder 1; the blower 3 is moved to the right section of the cylinder 1 and started, opening the feed inlet 12 of the enclosed vibrating feeder 2. Airflow is then drawn in through the feed inlet 12, passes through the receiving channel 10, and exits through the dust filter mechanism 5 at the right end of the cylinder 1. At this time, molding sand is fed into the enclosed vibrating feeder 2 through the feed inlet 12; dust generated during the feeding process is drawn in and does not escape into the workshop. After feeding is completed, the sliding cover 13 closes the feed inlet 12, the blower 3 is moved to the left end of the cylinder 1, and the opening and closing mechanism 4 opens the left port of the cylinder 1. Airflow is then drawn in from the left end of the cylinder 1 and exits through the dust filter mechanism 5 at the right end of the cylinder 1. At this time, the first electromagnet 11 is energized, and the enclosed vibrating feeder 2 is started, causing the molding sand to gradually slide into the receiving channel 10. Iron filings in the molding sand are adsorbed onto the inner wall of the receiving channel 10, while the remaining materials continue to enter the cylinder 1. Under the action of wind, large particles of impurities are thrown into the second hopper 7, the molding sand into the third hopper 8, and the crushed sand into the fourth hopper 9. Dust is carried by the airflow into the dust filter mechanism 5 and trapped inside. In this way, various impurities are separated from the molding sand. Finally, the enclosed vibrating feeder 2 and the blower 3 are turned off, de-energizing the first electromagnet 11, allowing the iron filings to fall into the first hopper 6. This invention can simultaneously separate crushed sand, dust, iron filings, and large particles of impurities mixed in the molding sand, eliminating the need for secondary transfer of the molding sand and simplifying operation. In addition, this invention can prevent dust pollution in the workshop and eliminates the need to replace the screen, making maintenance easier.

[0038] Example 2

[0039] like Figures 5-7 As shown, based on Embodiment 1, the driving mechanism includes: a guide rail 16 extending in the left-right direction; a connecting shaft 17 extending in the front-back direction is provided in the middle of the guide rail 16, and the cylinder wall of the cylinder 1 is provided with a mounting hole 18, and the connecting shaft 17 is mounted in the mounting hole 18 through a first sealed bearing; the driving mechanism also includes: a driving unit that drives the guide rail 16 to rotate around the connecting shaft 17 to adjust the height of the left and right ends of the guide rail 16; the driving mechanism has two parts, front and rear, and the fan 3 is provided with roller groups that limit the guide rail 16 on the front and rear sides of its housing respectively.

[0040] It should be understood that by having the drive unit rotate the guide rail 16 around the connecting shaft 17, so that the left end of the guide rail 16 is higher than the right end, the blower 3 can slide to the right end of the guide rail 16. Next, the opening and closing mechanism 4 closes the left port of the cylinder 1, the blower 3 is started, and the feed inlet 12 of the enclosed vibrating feeder 2 is opened. In this way, airflow can be drawn in from the feed inlet 12 and discharged from the dust filter mechanism 5 at the right end of the cylinder 1. At this time, molding sand can be fed into the enclosed vibrating feeder 2 through the feed inlet 12; the dust generated during the feeding process will be sucked in and will not escape into the workshop. By having the drive unit rotate the guide rail 16 around the connecting shaft 17, so that the left end of the guide rail 16 is lower than the right end, the blower 3 can slide to the left end of the guide rail 16. The sliding cover 13 closes the feed inlet 12, the opening and closing mechanism 4 opens the left port of the cylinder 1, and the blower 3 is started. In this way, the airflow will be drawn in from the left end of the cylinder 1 and discharged through the dust filter mechanism 5 at the right end of the cylinder 1. At this time, the enclosed vibrating feeder 2 is started, so that the molding sand gradually slides down, and the first electromagnet 11 is energized, so that the broken sand, dust, iron filings and large particulate impurities mixed in the molding sand can be separated.

[0041] Example 3

[0042] like Figures 5-7 As shown, based on Embodiment 2, the driving unit includes: a second electromagnet 19 that drives the guide rail 16 to rise to the left and fall to the right, and a third electromagnet 20 that drives the guide rail 16 to fall to the left and rise to the right; the left and right ends of the guide rail 16 are made of iron, the second electromagnet 19 is distributed above the left end and below the right end of the guide rail 16, and the third electromagnet 20 is distributed below the left end and above the right end of the guide rail 16.

[0043] It should be understood that energizing the second electromagnet 19 and de-energizing the third electromagnet 20 will cause the left end of the guide rail 16 to rotate upwards and the right end downwards, thus making the left end of the guide rail 16 higher than the right end, and causing the fan 3 to slide to the right end of the guide rail 16. Conversely, de-energizing the second electromagnet 19 and energizing the third electromagnet 20 will cause the left end of the guide rail 16 to rotate downwards and the right end upwards, thus making the left end of the guide rail 16 lower than the right end, and causing the fan 3 to slide to the left end of the guide rail 16. The drive unit using the aforementioned structure is not only simple in structure and low in cost, but also, in dusty environments, compared with commonly used linear drive devices such as cylinders and electric cylinders, the drive unit provided in this application will not experience problems such as jamming or accelerated wear, and is more stable and reliable.

[0044] Example 4

[0045] like Figures 5-7As shown, based on Embodiment 3, the second electromagnet 19 and the third electromagnet 20 each block the rotation trajectory at the end of the guide rail 16 to limit the maximum rotation angle of the guide rail 16; the second electromagnet 19 and the third electromagnet 20 are each detachably mounted on the inner wall of the cylinder 1 by bolts; the second electromagnet 19 and the third electromagnet 20 limit the roller assembly to prevent the roller assembly from dislodging from the end of the guide rail 16.

[0046] It should be understood that the second electromagnet 19 and the third electromagnet 20 on the right end of the guide rail 16 can be installed on the inner wall of the cylinder 1 first; then the guide rail 16 can be installed on the inner wall of the cylinder 1; next, the roller assembly of the fan 3 can be made to cooperate with the guide rail 16, and the fan 3 can be pushed to the right end of the guide rail 16; finally, the second electromagnet 19 and the third electromagnet 20 on the left end of the guide rail 16 can be installed on the inner wall of the cylinder 1; in this way, the installation of the guide rail 16 and the fan 3 can be completed conveniently and quickly. The second electromagnet 19 and the third electromagnet 20 can play multiple roles: first, they drive the guide rail 16 to rotate around the connecting shaft 17, changing the height of the left and right ends of the guide rail 16, thereby driving the fan 3 to slide to the left or right end of the guide rail 16; second, they limit the roller assembly to prevent the fan 3 from sliding out of the end of the guide rail 16; and third, they limit the maximum rotation distance of the left and right ends of the guide rail 16.

[0047] Example 5

[0048] like Figure 7 As shown, based on Embodiment 3 or Embodiment 4, the roller assembly includes: a plurality of upper rollers 21 distributed in the left-right direction, and a plurality of lower rollers 22 corresponding one-to-one with the upper rollers 21; the guide rail 16 is sandwiched between the upper rollers 21 and the lower rollers 22; the upper rollers 21 are V-shaped wheels, and the upper surface of the guide rail 16 is configured in a matching inverted V shape.

[0049] It should be understood that by adopting the above structure, the sand used for shaping can be effectively prevented from accumulating on the upper surface of the guide rail 16, thereby ensuring that the fan 3 can slide stably and smoothly along the guide rail 16.

[0050] Example 6

[0051] like Figure 7 As shown, based on Embodiment 2, the roller assembly includes: a plurality of upper rollers 21 distributed in the left-right direction, and a plurality of lower rollers 22 corresponding one-to-one with the upper rollers 21; the guide rail 16 is sandwiched between the upper rollers 21 and the lower rollers 22; the upper rollers 21 are V-shaped wheels, and the upper surface of the guide rail 16 is configured in a matching inverted V shape.

[0052] Example 7

[0053] like Figures 8-10As shown, based on any one of Embodiments 3 to 5, the opening and closing mechanism 4 includes: an air inlet plate 23 installed at the left end of the cylinder 1, and a baffle plate 24 rotatably connected to the air inlet plate 23; the air inlet plate 23 is provided with a plurality of first air inlets 25 penetrating the left and right surfaces, and the baffle plate 24 is provided with a plurality of second air inlets 26 penetrating the left and right surfaces; when the baffle plate 24 rotates to the point where the first air inlets 25 and the second air inlets 26 are aligned one by one, the opening and closing mechanism 4 is in the open state; when the baffle plate 24 rotates to the point where the first air inlets 25 and the second air inlets 26 are misaligned, the opening and closing mechanism 4 closes the left end of the cylinder 1.

[0054] It should be understood that by rotating the baffle plate 24 to align the first air inlet 25 with the second air inlet 26, the opening and closing mechanism 4 can open the left port of the cylinder 1; by rotating the baffle plate 24 to offset the first air inlet 25 with the second air inlet 26, the opening and closing mechanism 4 can close the left port of the cylinder 1.

[0055] Example 8

[0056] like Figures 8-10 As shown, based on embodiment 7, the wind deflector 24 is located to the right of the air inlet plate 23; the wind deflector 24 is provided with a slot 27 for the left end of one of the guide rails 16 to be inserted; when the guide rail 16 is driven to rise to the left and fall to the right by the second electromagnet 19, it drives the wind deflector 24 to rotate until the first air inlet 25 and the second air inlet 26 are misaligned; when the guide rail 16 is driven to fall to the left and rise to the right by the third electromagnet 20, it drives the wind deflector 24 to rotate until the first air inlet 25 and the second air inlet 26 are aligned one by one.

[0057] It should be understood that when the second electromagnet 19 is energized and the third electromagnet 20 is de-energized, the left ends of the two guide rails 16 rotate upwards and the right ends rotate downwards. This not only allows the fan 3 to slide to the right end of the guide rail 16, but also causes the left end of one of the guide rails 16 to rotate along with the baffle 24, thus misaligning the first air inlet 25 with the second air inlet 26, thereby closing the left port of the cylinder 1 with the opening and closing mechanism 4. When the second electromagnet 19 is de-energized and the third electromagnet 20 is energized, the left ends of the two guide rails 16 rotate downwards and the right ends rotate upwards. This not only allows the fan 3 to slide to the left end of the guide rail 16, but also causes the left end of one of the guide rails 16 to rotate along with the baffle 24, thus aligning the first air inlet 25 with the second air inlet 26, thereby opening the left port of the cylinder 1 with the opening and closing mechanism 4. Thus, when switching the on / off states of the second electromagnet 19 and the third electromagnet 20, not only can the position of the fan 3 in the left and right directions be changed, but the opening and closing mechanism can also be automatically switched to the corresponding opening and closing state, thereby making the control operation more convenient.

[0058] Example 9

[0059] like Figure 8As shown, based on Embodiment 7 or Embodiment 8, one of the air inlet plate 23 and the wind deflector plate 24 is provided with a central shaft 28 extending in the left-right direction, and the other is provided with a central hole 29; the central shaft 28 is mounted on the central hole 29 through a second sealing bearing 30.

[0060] It should be understood that a central shaft 28 extending to the right can be provided on the right side of the air inlet plate 23, and a central hole 29 can be provided on the air baffle plate 24. Alternatively, a central shaft 28 extending to the left can be provided on the left side of the air baffle plate 24, and a central hole 29 can be provided on the air inlet plate 23.

[0061] Example 10

[0062] like Figure 8 As shown, based on any one of Embodiments 7 to 9, the first air inlet 25 and the second air inlet 26 are both configured in a fan shape and are evenly distributed around the central axis 28.

[0063] It should be understood that the circumferential spacing between adjacent first air inlets 25 is slightly greater than the circumferential width of the first air inlet 25; similarly, the circumferential spacing between adjacent second air inlets 26 is slightly greater than the circumferential width of the second air inlets 26. This maximizes the total area of ​​the first air inlets 25 and the second air inlets 26 while ensuring the sealing effect of the opening and closing mechanism 4; thus achieving maximum air intake when the opening and closing mechanism 4 is open.

[0064] Example 11

[0065] like Figures 1-3 As shown, based on any one of Embodiments 1 to 10, the dust filtration mechanism 5 adopts a cyclone separator, and a cloth bag is installed at the air outlet of the cyclone separator.

[0066] It should be understood that, depending on the actual situation, if the molding sand contains relatively little dust, the filter cloth or bag can be directly installed at the right end of the cylinder 1 as the dust filtration mechanism 5. This eliminates the need for a cyclone separator, further reducing equipment costs.

[0067] While specific embodiments of the present invention have been described above, those skilled in the art should understand that various changes or modifications can be made to these embodiments without departing from the principles and essence of the present invention, and all such changes and modifications fall within the protection scope of the present invention.

Claims

1. A pretreatment device for molding sand, characterized in that, include: A cylinder extending in the left-right direction (1); and An enclosed vibrating feeder (2) located above the cylinder (1); and A blower (3) installed inside the cylinder (1) and blowing air to the right; and A drive mechanism that drives the fan (3) to move left and right; in, The cylinder (1) is equipped with an opening and closing mechanism (4) at its left port and a dust filtering mechanism (5) at its right port. The bottom of the cylinder (1) is provided with a first hopper (6), a second hopper (7), a third hopper (8), and a fourth hopper (9) from left to right. The first hopper (6), the second hopper (7), the third hopper (8), and the fourth hopper (9) are respectively provided with discharge ports and valves. The cylinder (1) has a receiving channel (10) at the top of the left section, and a first electromagnet (11) is installed on the outside of the receiving channel (10). The first hopper (6) is located directly below the receiving channel (10); The feed inlet (12) of the enclosed vibrating feeder (2) is provided with a sliding cover (13), and the discharge outlet (14) is connected to the receiving channel (10) through a corrugated pipe (15); The drive mechanism includes: a guide rail (16) extending in the left-right direction; The guide rail (16) has a connecting shaft (17) extending in the front-rear direction in the middle, and the cylinder wall of the cylinder (1) has a mounting hole (18). The connecting shaft (17) is mounted in the mounting hole (18) through a first sealed bearing. The drive mechanism further includes a drive unit that drives the guide rail (16) to rotate around the connecting shaft (17) to adjust the height of the left and right ends of the guide rail (16); The drive mechanism has two parts, front and rear, and the fan (3) has roller sets that limit the guide rail (16) on the front and rear sides of its housing respectively. The driving unit includes: a second electromagnet (19) that drives the guide rail (16) to rise to the left and fall to the right, and a third electromagnet (20) that drives the guide rail (16) to fall to the left and rise to the right. The left and right ends of the guide rail (16) are made of iron; The second electromagnet (19) is located above the left end and below the right end of the guide rail (16); The third electromagnet (20) is located below the left end and above the right end of the guide rail (16); The opening and closing mechanism (4) includes: an air inlet plate (23) installed at the left end of the cylinder (1) and a baffle plate (24) rotatably connected to the air inlet plate (23). The air inlet plate (23) is provided with multiple first air inlets (25) penetrating the left and right surfaces, and the wind deflector plate (24) is provided with multiple second air inlets (26) penetrating the left and right surfaces. When the baffle plate (24) rotates to the point where the first air inlet (25) and the second air inlet (26) are aligned one by one, the opening and closing mechanism (4) is in the open state; When the baffle plate (24) rotates to the point where the first air inlet (25) and the second air inlet (26) are misaligned, the opening and closing mechanism (4) closes the left port of the cylinder (1); The wind deflector (24) is located on the right side of the air inlet plate (23); The baffle plate (24) is provided with a slot (27) for the left end of one of the guide rails (16) to be inserted. When the guide rail (16) moves left and right under the drive of the second electromagnet (19), it drives the baffle plate (24) to rotate until the first air inlet (25) and the second air inlet (26) are misaligned. When the guide rail (16) moves left and right under the drive of the third electromagnet (20), it drives the baffle plate (24) to rotate until the first air inlet (25) and the second air inlet (26) are aligned one by one.

2. The pretreatment device for molding sand according to claim 1, characterized in that: The second electromagnet (19) and the third electromagnet (20) each block the rotation trajectory at the end of the guide rail (16) to limit the maximum rotation angle of the guide rail (16); The second electromagnet (19) and the third electromagnet (20) are each detachably mounted on the inner wall of the cylinder (1) by bolts; The second electromagnet (19) and the third electromagnet (20) limit the roller assembly to prevent the roller assembly from dislodging from the end of the guide rail (16).

3. The pretreatment device for molding sand according to claim 1 or 2, characterized in that: The roller assembly includes: multiple upper rollers (21) distributed along the left and right direction, and multiple lower rollers (22) corresponding one-to-one with the upper rollers (21); The guide rail (16) is sandwiched between the upper roller (21) and the lower roller (22); The upper roller (21) is a V-shaped wheel, and the upper surface of the guide rail (16) is configured in a matching inverted V shape.

4. The pretreatment device for molding sand according to claim 1, characterized in that: One of the air inlet plate (23) and the wind deflector plate (24) is provided with a central shaft (28) extending in the left-right direction, and the other is provided with a central hole (29); the central shaft (28) is mounted on the central hole (29) through a second sealed bearing (30).

5. The pretreatment device for molding sand according to claim 1, characterized in that: The first air inlet (25) and the second air inlet (26) are both set in a fan shape and are evenly distributed around the central axis (28).

6. The pretreatment device for molding sand according to claim 1 or 2, characterized in that: The dust filtration mechanism (5) adopts a cyclone separator, and a cloth bag is installed at the air outlet of the cyclone separator.

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