Pretreatment device for molding sand

Abstract

The invention provides a pretreatment device for molding sand, and relates to the technical field of casting molding material separation equipment. The technical problems that in the prior art, when multiple impurities are separated from molding sand, operation is troublesome, and flying dust can be generated are solved. According to the technical scheme, the pretreatment device for the molding sand comprises a cylinder extending leftwards and rightwards, a closed type vibration feeder, a fan blowing air rightwards in the cylinder and a driving mechanism driving the fan to move leftwards and rightwards; a left port of the cylinder is provided with an opening and closing mechanism, and a right port is provided with a dust filtering mechanism; a first stock bin, a second stock bin, a third stock bin and a fourth stock bin are sequentially arranged at the bottom of the cylinder from left to right; a receiving channel and a first electromagnet are arranged at the top of the left section of the cylinder; and a discharge hole of the closed type vibrating feeder is communicated with the material receiving channel through a corrugated pipe. Various impurities in the molding sand can be separated at the same time, secondary transfer of the molding sand is not needed, and operation is simpler and more convenient; meanwhile, flying dust can be prevented from polluting workshops.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of casting molding material sorting equipment, in particular to a molding sand pretreatment device. BACKGROUND

[0002] Molding sand, also known as casting sand, is a basic refractory material used for manufacturing sand molds in casting production. The role of molding sand in casting production is extremely important. The casting defects caused by poor quality of molding sand can account for 30% to 50% of the total casting defects. Molding sand mainly includes new sand and reclaimed sand. New sand will produce broken sand and dust during long-distance transportation. Reclaimed sand is prone to mix with iron filings and large particle impurities in addition to broken sand and dust. In order to further improve the quality of molding sand and reduce casting defects, it is necessary to pretreat the molding sand before manufacturing sand molds to separate the mixed broken sand, dust, iron filings and large particle impurities.

[0003] The existing technology generally uses a magnetic separator to separate iron filings and a vibrating screen to separate broken sand and large particle impurities. This requires twice transportation and feeding of the molding sand, which is relatively troublesome. Moreover, the content of iron filings in the molding sand is relatively small, so it is not cost-effective to specially purchase a magnetic separator for pretreatment. In addition, the vibrating screen will produce dust during feeding and screening of the molding sand, which pollutes the workshop. Moreover, the vibrating screen needs to be regularly replaced with a screen, which is relatively troublesome to maintain. SUMMARY

[0004] The molding sand pretreatment device provided by the present application can simultaneously separate the mixed broken sand, dust, iron filings and large particle impurities in the molding sand, without the need for twice transportation of the molding sand, which is more convenient to operate. In addition, the pretreatment device can avoid dust pollution of the workshop and does not need to replace the screen, which is more convenient to maintain.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows: The molding sand pretreatment device comprises a cylinder extending in the left-right direction, a closed vibrating feeder located above the cylinder, a fan arranged in the cylinder and blowing air to the right, a driving mechanism for driving the fan to move left and right, an opening and closing mechanism installed at the left end of the cylinder, and a dust filtering mechanism installed at the right end of the cylinder. A first bin, a second bin, a third bin and a fourth bin are sequentially arranged from left to right at the bottom of the cylinder, and each bin is provided with a discharge port and a valve. A receiving channel is arranged at the top of the left segment of the cylinder, and a first electromagnet is installed outside the receiving channel. The first bin is located directly below the receiving channel. The inlet of the closed vibrating feeder is provided with a sliding cover, and the outlet is communicated with the receiving channel through a corrugated pipe.

[0006] Optionally, the driving mechanism comprises a guide rail extending in the left-right direction; a connecting shaft extending in the front-back direction is arranged at the middle part of the guide rail; the cylinder wall is provided with a mounting hole; the connecting shaft is mounted in the mounting hole through a first sealing bearing; the driving mechanism further comprises a driving unit for driving the guide rail to rotate around the connecting shaft to adjust the height of the left and right ends of the guide rail; the driving mechanism is provided with two in front and back; the fan is provided with a roller set limited in the guide rail at the front and back sides of the shell.

[0007] Optionally, the driving unit comprises a second electromagnet for driving the left end of the guide rail to rise and the right end to descend, and a third electromagnet for driving the left end of the guide rail to descend and the right end to rise; the left and right ends of the guide rail are made of iron; the second electromagnet is arranged above the left end and below the right end of the guide rail; the third electromagnet is arranged below the left end and above the right end of the guide rail.

[0008] Optionally, the second electromagnet and the third electromagnet are respectively arranged on the rotating track of the end of the guide rail to limit the maximum rotating angle of the guide rail; the second electromagnet and the third electromagnet are respectively detachably mounted on the inner wall of the cylinder through bolts; the second electromagnet and the third electromagnet limit the roller set to prevent the roller set from being pulled out of the end of the guide rail.

[0009] Optionally, the roller set comprises a plurality of upper rollers distributed in the left-right direction and a plurality of lower rollers corresponding to the upper rollers one by one; the guide rail is clamped between the upper rollers and the lower rollers; the upper rollers are V-shaped wheels; the upper surface of the guide rail is arranged in an inverted V shape.

[0010] Optionally, the opening and closing mechanism comprises an air inlet plate mounted on the left end of the cylinder and a baffle plate rotationally connected with the air inlet plate; the air inlet plate is provided with a plurality of first air inlets penetrating through the left and right surfaces; the baffle plate is provided with a plurality of second air inlets penetrating through the left and right surfaces; when the baffle plate is rotated to align the first air inlets with the second air inlets one by one, the opening and closing mechanism is in an open state; when the baffle plate is rotated to stagger the first air inlets and the second air inlets, the opening and closing mechanism closes the left end of the cylinder.

[0011] Optionally, the baffle plate is located on the right side of the air inlet plate; the baffle plate is provided with a slot for inserting the left end of one of the guide rails; when the left end of the guide rail is driven by the second electromagnet to rise on the left and descend on the right, the baffle plate is rotated to stagger the first air inlets and the second air inlets; when the left end of the guide rail is driven by the third electromagnet to descend on the left and rise on the right, the baffle plate is rotated to align the first air inlets with the second air inlets one by one.

[0012] Optionally, one of the air inlet plate and the baffle plate is provided with a central shaft extending in the left-right direction, and the other is provided with a central hole; the central shaft is mounted in the central hole through a second sealing bearing.

[0013] Optionally, the first air inlet and the second air inlet are arranged in a fan shape and are uniformly distributed around the central axis.

[0014] Optionally, the dust filtering mechanism adopts a cyclone separator, and a cloth bag is installed at the air outlet of the cyclone separator.

[0015] The working principle of the present application is as follows: the opening and closing mechanism closes the left port of the cylinder; the fan is moved to the right section of the cylinder, the fan is started, and the feeding port of the closed vibrating feeder is opened. In this way, the airflow is sucked from the feeding port, passes through the material receiving channel, and is discharged from the dust filtering mechanism at the right end of the cylinder. At this time, the sand for modeling is put into the closed vibrating feeder through the feeding port, and the dust generated during the feeding process is sucked and does not escape to the workshop. After the feeding is completed, the sliding cover closes the feeding port, the fan is moved to the left end of the cylinder, and the opening and closing mechanism opens the left port of the cylinder. In this way, the airflow is sucked from the left end of the cylinder, passes through the dust filtering mechanism at the right end of the cylinder, and is discharged. At this time, the first electromagnet is energized; and the closed vibrating feeder is started, so that the sand for modeling gradually slides into the material receiving channel. The iron filings in the sand for modeling are adsorbed on the inner wall of the material receiving channel, and the remaining substances continue to enter the cylinder; under the action of wind, large-particle impurities fall into the second bin, sand for modeling falls into the third bin, and broken sand falls into the fourth bin; dust enters the dust filtering mechanism with the airflow and is trapped in the dust filtering mechanism; in this way, various impurities can be separated from the sand for modeling. Finally, the closed vibrating feeder and the fan are turned off, and the first electromagnet is de-energized, so that the iron filings fall into the first bin.

[0016] Therefore, the present application has the following advantages: the broken sand, dust, iron filings and large-particle impurities mixed in the sand for modeling can be separated at the same time, the sand for modeling does not need to be transported twice, the operation is more convenient, the present application can also avoid dust pollution in the workshop, and the screen does not need to be replaced, so that the maintenance is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 The figure is a structural schematic diagram of the present application; Figure 2 The figure is a schematic diagram of the sliding cover closing the feeding port; Figure 3 The figure is a schematic diagram of the corrugated pipe arranged between the material receiving channel and the discharge port; Figure 4 The figure is a schematic diagram of the first electromagnet arranged outside the material receiving channel. Figure 5 Schematic diagram of installing a fan in the cylinder; Figure 6 Schematic diagram of installing a guide rail in the cylinder; Figure 7 Schematic diagram of installing a fan in the guide rail; Figure 8 Schematic diagram of assembling an opening and closing mechanism; Figure 9 Schematic diagram of rotating the baffle to align the first and second air inlets by the guide rail; Figure 10 Schematic diagram of rotating the baffle to misalign the first and second air inlets by the guide rail.

[0019] Reference signs: 1, cylinder; 2, closed vibrating feeder; 3, fan; 4, opening and closing mechanism; 5, dust filtering mechanism; 6, first material bin; 7, second material bin; 8, third material bin; 9, fourth material bin; 10, material receiving channel; 11, first electromagnet; 12, material inlet; 13, sliding cover; 14, material outlet; 15, corrugated pipe; 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; 25, first air inlet; 26, second air inlet; 27, insertion slot; 28, center shaft; 29, center hole; 30, second sealing bearing. DETAILED DESCRIPTION

[0020] Hereinafter, only certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0021] In the description of the present application, it needs to be understood that the terms "front", "back", "left", "right", and the like indicate the orientation or positional relationship based on the drawings shown in the accompanying drawings. Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0022] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0023] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0024] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] Example 1

[0026] like Figures 1-5 As shown, an embodiment of the present invention provides a pre-treatment device for molding sand. The pre-treatment device comprises: a cylinder 1 extending in the left-right direction, a closed vibrating feeder 2 located above the cylinder 1, a fan 3 provided in the cylinder 1 and blowing air to the right, and a driving mechanism for driving the fan 3 to move 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; a first silo 6, a second silo 7, a third silo 8, and a fourth silo 9 are provided at the bottom of the cylinder 1 from left to right, and the first silo 6, the second silo 7, the third silo 8, and the fourth silo 9 are respectively provided with a discharge port and a valve; a material 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 material receiving channel 10; the first silo 6 is located directly below the material receiving channel 10; a sliding cover 13 is provided at the feed port 12 of the closed vibrating feeder 2, and a discharge port 14 is connected to the material receiving channel 10 through a bellows 15.

[0027] The following describes a specific embodiment of the present invention: The opening and closing mechanism 4 closes the left end of the cylinder 1; the fan 3 moves to the right end of the cylinder 1 and is activated, opening the feed port 12 of the enclosed vibrating feeder 2. This draws air in through the feed port 12, passes through the material receiving channel 10, and is discharged through the dust filter 5 at the right end of the cylinder 1. At this point, molding sand is fed into the enclosed vibrating feeder 2 through the feed port 12, and dust generated during the feeding process is sucked in and prevented from escaping into the workshop. After feeding is complete, the sliding cover 13 closes the feed port 12, the fan 3 moves to the left end of the cylinder 1, and the opening and closing mechanism 4 opens the left end of the cylinder 1. This draws air in through the left end of the cylinder 1 and is discharged through the dust filter 5 at the right end. At this point, the first electromagnet 11 is energized, and the enclosed vibrating feeder 2 is activated, causing the molding sand to gradually slide into the material receiving channel 10. The iron filings in the molding sand will be adsorbed on the inner wall of the receiving channel 10, and the remaining substances will continue to enter the cylinder 1; under the action of wind, large particles of impurities will be thrown into the second silo 7, the molding sand will be thrown into the third silo 8, and the crushed sand will be thrown into the fourth silo 9; the dust will enter the dust filter mechanism 5 with the air flow and be trapped in the dust filter mechanism 5; in this way, various impurities can be separated from the molding sand. Finally, turn off the closed vibrating feeder 2 and the fan 3, and cut off the power to the first electromagnet 11, so that the iron filings can fall into the first silo 6. The present invention can simultaneously separate the crushed sand, dust, iron filings and large particles of impurities mixed in the molding sand, without the need for secondary transportation of the molding sand, and is easier to operate; in addition, the present invention can also avoid dust pollution in the workshop, and does not require the replacement of the screen, making maintenance easier.

[0028] Example 2

[0029] like Figures 5-7 As shown, on the basis of Example 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 a mounting hole 18 is provided on the wall of the cylinder 1, and the connecting shaft 17 is installed 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 is provided with two front and rear rollers, and the fan 3 is respectively provided with roller groups limited to the guide rail 16 on the front and rear sides of its casing.

[0030] It should be understood that the driving unit drives the guide rail 16 to rotate around the connecting shaft 17, so that the left end of the guide rail 16 is higher than the right end, and the fan 3 is slid to the right end of the guide rail 16. Then, the opening and closing mechanism 4 closes the left port of the cylinder 1, the fan 3 is started, and the feeding port 12 of the closed type vibrating feeder 2 is opened. In this way, the airflow can be sucked from the feeding port 12 and discharged from the dust filtering mechanism 5 at the right end of the cylinder 1. At this time, the molding sand can be put into the closed type vibrating feeder 2 through the feeding port 12, and the dust generated during the feeding process can be sucked and not dispersed to the workshop. The driving unit drives the guide rail 16 to rotate around the connecting shaft 17, so that the left end of the guide rail 16 is lower than the right end, and the fan 3 is slid to the left end of the guide rail 16. The sliding cover 13 closes the feeding port 12, the opening and closing mechanism 4 opens the left port of the cylinder 1, and the fan 3 is started. In this way, the airflow is sucked from the left end of the cylinder 1 and discharged from the dust filtering mechanism 5 at the right end of the cylinder 1. At this time, the closed type vibrating feeder 2 is started, the molding sand gradually slides down, and the first electromagnet 11 is energized, so that the mixed sand, dust, iron filings and large particle impurities in the molding sand can be separated out.

[0031] Example 3

[0032] As shown in the embodiment 2, the driving unit comprises a second electromagnet 19 for driving the left end of the guide rail 16 to rise and the right end to descend, and a third electromagnet 20 for driving the left end of the guide rail 16 to descend and the right end to rise. Figures 5-7 It should be understood that the second electromagnet 19 is energized and the third electromagnet 20 is de-energized, so that the left end of the guide rail 16 is rotated upward and the right end is rotated downward, so that the left end of the guide rail 16 is higher than the right end, and the fan 3 is slid to the right end of the guide rail 16. Conversely, the second electromagnet 19 is de-energized and the third electromagnet 20 is energized, so that the left end of the guide rail 16 is rotated downward and the right end is rotated upward, so that the left end of the guide rail 16 is lower than the right end, and the fan 3 is slid to the left end of the guide rail 16. The driving unit with the above structure not only has simple structure and low cost, but also in the dust environment, compared with the commonly used linear driving devices such as air cylinder and electric cylinder, the driving unit provided by the application will not have the problems of jamming and accelerated wear, and is more stable and reliable.

[0033] Example 4

[0034] As shown in the embodiment 2, the driving unit comprises a second electromagnet 19 for driving the left end of the guide rail 16 to rise and the right end to descend, and a third electromagnet 20 for driving the left end of the guide rail 16 to descend and the right end to rise.

[0035] Figures 5-7 ​As shown, on the basis of Example 3, the second electromagnet 19 and the third electromagnet 20 each block the rotation trajectory of 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 group to prevent the roller group from escaping from the end of the guide rail 16.

[0036] It should be understood that the second electromagnet 19 and the third electromagnet 20 at the right end of the guide rail 16 can be first installed on the inner wall of the cylinder 1; then the guide rail 16 can be installed on the inner wall of the cylinder 1; then the roller assembly of the fan 3 can be matched 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 at 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, it drives 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, it limits the roller assembly to prevent the fan 3 from sliding out of the end of the guide rail 16; and third, it limits the maximum rotation distance of the left and right ends of the guide rail 16.

[0037] Example 5

[0038] like Figure 7 As shown, based on Example 3 or Example 4, the roller group includes: a plurality of upper rollers 21 distributed along the left and right directions, and a plurality of lower rollers 22 corresponding one to one with the upper rollers 21; the guide rail 16 is clamped between the upper rollers 21 and the lower rollers 22; the upper roller 21 is a V-shaped wheel, and the upper surface of the guide rail 16 is set to a corresponding inverted V shape.

[0039] It should be understood that the above structure can effectively prevent molding sand from accumulating on the upper surface of the guide rail 16 , thereby ensuring that the fan 3 can slide left and right along the guide rail 16 stably and smoothly.

[0040] Example 6

[0041] like Figure 7 As shown, based on Example 2, the roller group includes: a plurality of upper rollers 21 distributed along the left and right directions, and a plurality of lower rollers 22 corresponding one to one with the upper rollers 21; the guide rail 16 is clamped between the upper rollers 21 and the lower rollers 22; the upper roller 21 is a V-shaped wheel, and the upper surface of the guide rail 16 is set to a corresponding inverted V shape.

[0042] Example 7

[0043] like Figures 8-10As shown, on the basis of any one of Examples 3 to 5, the opening and closing mechanism 4 includes: an air inlet plate 23 installed at the left port of the cylinder 1, and a wind shield 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 passing through the left and right surfaces, and the wind shield plate 24 is provided with a plurality of second air inlets 26 passing through the left and right surfaces; when the wind shield plate 24 is rotated until the first air inlets 25 and the second air inlets 26 are aligned one by one, the opening and closing mechanism 4 is in an open state; when the wind shield plate 24 is rotated until the first air inlets 25 and the second air inlets 26 are staggered, the opening and closing mechanism 4 closes the left port of the cylinder 1.

[0044] It should be understood that by rotating the wind shield 24 so that the first air inlet 25 and the second air inlet 26 are aligned one by one, the opening and closing mechanism 4 can open the left port of the cylinder 1; by rotating the wind shield 24 so that the first air inlet 25 and the second air inlet 26 are staggered, the opening and closing mechanism 4 can close the left port of the cylinder 1.

[0045] Example 8

[0046] like Figures 8-10 As shown, based on Example 7, the wind shield 24 is located on the right side of the air inlet plate 23; the wind shield 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 by the second electromagnet 19 to rise to the left and fall to the right, it drives the wind shield 24 to rotate until the first air inlet 25 and the second air inlet 26 are staggered; when the guide rail 16 is driven by the third electromagnet 20 to fall to the left and rise to the right, it drives the wind shield 24 to rotate until the first air inlet 25 and the second air inlet 26 are aligned one by one.

[0047] 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 upward and the right ends rotate downward, not only allowing the fan 3 to slide to the right end of the guide rail 16; the left end of one of the guide rails 16 also rotates with the windshield 24, causing the first air inlet 25 to be offset from the second air inlet 26, thereby causing the opening and closing mechanism 4 to close the left end of the cylinder 1. 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 downward and the right ends rotate upward, not only allowing the fan 3 to slide to the left end of the guide rail 16; the left end of one of the guide rails 16 also rotates with the windshield 24, causing the first air inlet 25 to be aligned with the second air inlet 26, thereby causing the opening and closing mechanism 4 to open the left end of the cylinder 1. In this way, when switching the on and off states of the second electromagnet 19 and the third electromagnet 20, not only the position of the fan 3 in the left and right directions can be changed, but also the opening and closing mechanism can be automatically switched to a corresponding opening and closing state, thereby making the control operation easier.

[0048] Example 9

[0049] like Figure 8As shown, based on Example 7 or Example 8, one of the air inlet plate 23 and the wind shield plate 24 is provided with a central axis 28 extending in the left-right direction, and the other is provided with a central hole 29; the central axis 28 is installed in the central hole 29 through a second sealed bearing 30.

[0050] It should be understood that the center axis 28 extending rightward can be set on the right side of the air inlet plate 23, and the center hole 29 can be set on the air shield 24. Alternatively, the center axis 28 extending leftward can be set on the left side of the air shield 24, and the center hole 29 can be set on the air inlet plate 23.

[0051] Example 10

[0052] like Figure 8 As shown, based on any one of Examples 7 to 9, the first air inlet 25 and the second air inlet 26 are both arranged in a fan shape and are evenly distributed around the central axis 28 .

[0053] 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 inlets 25, and 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 combined area of ​​the first and second air inlets 25, 26 while ensuring the sealing effect of the opening and closing mechanism 4, thereby achieving maximum air intake when the opening and closing mechanism 4 is open.

[0054] Example 11

[0055] like Figures 1-3 As shown, on the basis of any one of Examples 1 to 10, the dust filtering mechanism 5 adopts a cyclone separator, and a cloth bag is installed at the air outlet of the cyclone separator.

[0056] It should be understood that, depending on the actual situation, if the molding sand used contains less dust, a filter cloth or bag can be directly installed at the right end of the cylinder 1 to serve as the dust filtering mechanism 5. In this way, there is no need to arrange a cyclone separator, which can further reduce equipment costs.

[0057] Although specific embodiments of the present invention are described above, those skilled in the art should understand that various changes or modifications may be made to these embodiments without departing from the principles and essence of the present invention, and that these changes and modifications fall within the scope of protection of the present invention.

Claims

1. A pre-treatment device for molding sand, characterized in that: include: A cylinder (1) extending in the left-right direction; and a closed vibrating feeder (2) located above the cylinder (1); and a fan (3) disposed in the cylinder (1) and blowing air to the right; and A driving mechanism for driving the fan (3) to move left and right; in, The left end of the cylinder (1) is equipped with an opening and closing mechanism (4), and the right end is equipped with a dust filtering mechanism (5); The bottom of the cylinder (1) is provided with a first silo (6), a second silo (7), a third silo (8), and a fourth silo (9) from left to right, and the first silo (6), the second silo (7), the third silo (8), and the fourth silo (9) are respectively provided with a discharge port and a valve installed; The cylinder (1) is provided with a material receiving channel (10) at the top of the left section, and a first electromagnet (11) is installed outside the material receiving channel (10); The first material bin (6) is located directly below the material receiving channel (10); The feed port (12) of the closed vibrating feeder (2) is provided with a sliding cover (13), and the discharge port (14) is connected to the material receiving channel (10) via a bellows (15).

2. The molding sand pretreatment device according to claim 1, characterized in that: The driving mechanism comprises: a guide rail (16) extending in the left-right direction; A connecting shaft (17) extending in the front-to-back direction is provided in the middle of the guide rail (16); a mounting hole (18) is provided on the wall of the cylinder (1); and the connecting shaft (17) is mounted in the mounting hole (18) via a first sealed bearing. The driving mechanism further comprises: a driving unit for driving the guide rail (16) to rotate around the connecting shaft (17) to adjust the heights of the left and right ends of the guide rail (16); The driving mechanism is provided with two front and rear parts, and the fan (3) is provided with roller groups limited to the guide rail (16) on the front and rear sides of its housing.

3. The pretreatment device for molding sand according to claim 2, characterized in that: The driving unit comprises: a second electromagnet (19) for driving the guide rail (16) to rise on the left and fall on the right, and a third electromagnet (20) for driving the guide rail (16) to fall on the left and rise on 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); The third electromagnet (20) is distributed below the left end and above the right end of the guide rail (16).

4. The molding sand pretreatment device according to claim 3, characterized in that: The second electromagnet (19) and the third electromagnet (20) each block the rotation trajectory of 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) via bolts; The second electromagnet (19) and the third electromagnet (20) limit the roller assembly to prevent the roller assembly from falling off the end of the guide rail (16).

5. The molding sand pretreatment device according to any one of claims 2 to 4, characterized in that: The roller assembly comprises: a plurality of upper rollers (21) distributed along the left-right direction, and a plurality of lower rollers (22) corresponding one-to-one to the upper rollers (21); The guide rail (16) is clamped 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 to be in a corresponding inverted V shape.

6. The molding sand pretreatment device according to claim 3 or 4, characterized in that: The opening and closing mechanism (4) comprises: an air inlet plate (23) installed at the left end of the cylinder (1), and a wind shield 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 wind shield plate (24) is provided with a plurality of second air inlets (26) penetrating the left and right surfaces; When the windshield (24) is rotated until the first air inlet (25) and the second air inlet (26) are aligned one by one, the opening and closing mechanism (4) is in an open state; When the windshield (24) rotates until the first air inlet (25) and the second air inlet (26) are offset, the opening and closing mechanism (4) closes the left end of the cylinder (1).

7. The molding sand pretreatment device according to claim 6, characterized in that: The wind shield (24) is located on the right side of the air inlet plate (23); The windshield (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 by the second electromagnet (19) to rise to the left and fall to the right, it drives the windshield (24) to rotate until the first air inlet (25) and the second air inlet (26) are staggered; when the guide rail (16) is driven by the third electromagnet (20) to fall to the left and rise to the right, it drives the windshield (24) to rotate until the first air inlet (25) and the second air inlet (26) are aligned one by one.

8. The molding sand pretreatment device according to claim 7, characterized in that: One of the air inlet plate (23) and the wind shield plate (24) is provided with a central axis (28) extending in the left-right direction, and the other is provided with a central hole (29); the central axis (28) is mounted in the central hole (29) via a second sealed bearing (30).

9. The molding sand pretreatment device according to claim 6, characterized in that: The first air inlet (25) and the second air inlet (26) are both arranged in a fan shape and are evenly distributed around the central axis (28).

10. The molding sand pretreatment device according to any one of claims 1 to 4, characterized in that: The dust filtering mechanism (5) adopts a cyclone separator, and a cloth bag is installed at the air outlet of the cyclone separator.

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