Foundry sand pretreatment device

Abstract

The present invention relates to the field of foundry sand processing, and more specifically, to a foundry sand pretreatment device, comprising a trumpet-shaped funnel and a foundry mold movably sleeved on the bottom surface of the trumpet-shaped funnel, wherein limit sliders are fixedly installed on both side surfaces of the foundry mold, a hollow slide box is movably sleeved on the inner wall surface of the trumpet-shaped funnel, the interiors of the trumpet-shaped funnel, the hollow slide box and the foundry mold are filled with foundry sand, and a hollow sleeve is provided on the top surface of the foundry mold. The foundry sand is screened for iron chips in conjunction with the hollow slide box, and the foundry sand is drained into the interior of the foundry mold through the trumpet-shaped funnel. At this time, the threaded rod is rotated in conjunction with an electric motor, and the limit slider drives the foundry mold to move to the vertical bottom position of the hydraulic rod. At this time, the hydraulic rod is used to press down the hollow sleeve, and the fluffy foundry sand is compacted in the interior of the foundry mold.

Description

Technical Field

[0001] The invention belongs to the technical field of foundry sand processing, in particular to a foundry sand preprocessing device. Background Art

[0002] In the foundry industry, molding sand is an important raw material, and its air permeability directly affects the quality of castings and the stability of the casting process. Therefore, accurate and efficient testing of the air permeability of molding sand has become an important technical requirement.

[0003] A patent with publication number CN118905151 discloses a pretreatment device for sand used in molding sand casting processing, which relates to the field of casting technology, including a shell, a controller is fixedly installed on the front side wall, and a distribution box is fixedly installed on the right side wall of the shell; a filtering mechanism, the filtering mechanism is arranged on the shell, and the filtering mechanism includes: a sand inlet hopper, the sand inlet hopper is fixedly installed on the top surface of the shell. In the present invention, a detection mechanism is provided to enable a gas pump to inject a fixed amount of gas into the gas injection bin, and the fluidity of the gas and the air permeability characteristics of the molding sand are utilized to effectively detect the ventilation performance of the molding sand. By providing the filtering mechanism, three filtrations of the molding sand are achieved. This vibration filtration method can effectively remove large particles in the molding sand and improve the uniformity of the molding sand. In the filtration process, the larger particles of molding sand filtered out in the first two times flow into the collection box through specific sand outlets and openings, thereby realizing the collection and treatment of unqualified molding sand and providing convenience for subsequent recycling B.

[0004] In the current existing technology, during the casting process of existing foundry sand, a large amount of gas will be generated when the molten metal is poured into the mold cavity. These gases include gas in the molten metal, water vapor generated by the evaporation of water in the molding sand, and gas generated by the decomposition of organic matter in the molding sand. If the molding sand has poor air permeability, these gases cannot be discharged from the mold cavity smoothly, and it is easy to form pores inside the casting, which reduces the quality and performance of the casting. Before the existing foundry sand is used, a permeability test will be carried out on the current batch of foundry sand. At this time, the foundry sand that has been tested will be directly cleaned up and cannot be used again. In addition, the sampling test has certain randomness and risks. It is impossible to test the current foundry sand while it can be used again later. In addition, the extruded foundry sand cannot be filled, stacked and tested by itself.

[0005] To this end, the present invention provides a foundry sand pretreatment device. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a foundry sand pretreatment device described in the present invention includes a trumpet-shaped funnel and a casting mold movably sleeved on the bottom surface of the trumpet-shaped funnel, a limiting slider is fixedly installed on the two side surfaces of the casting mold, a hollow slide box is movably sleeved on the inner wall surface of the trumpet-shaped funnel, the trumpet-shaped funnel, the hollow slide box and the casting mold are filled with casting sand, a hollow casing is provided on the top surface of the casting mold, a hydraulic rod is fixedly installed on the top surface of the hydraulic rod, and a A support frame, an air permeability meter is fixedly installed on the inner wall surfaces of both sides of the support frame, an air pipe is fixedly connected to the output end of the air permeability meter, and the other end of the air pipe is fixedly connected to the top surface of the hollow casing, a threaded rod is movably sleeved on the inner wall surface of the limiting slider, an electric motor is fixedly installed on one end of the threaded rod, a casting sand processing table is fixedly installed on the outer surface of the electric motor, a blanking port is opened on the edge position of one side of the top of the casting sand processing table, and a sliding groove is provided on the bottom surface of the casting sand processing table and at the bottom edge position of the blanking port.

[0008] Preferably, a swinging bottom plate is swingably connected to the bottom surface of the casting mold, and the bottom surface of the swinging bottom plate is movably overlapped on the top surface of the sliding chute. A limiting strip is provided on the top surface of the casting sand processing table and at the edge positions on both sides, and a limiting groove is provided on the outer surface of the casting sand processing table.

[0009] Preferably, a rounded corner is provided on one side surface of the swing bottom plate, and the outer side surface of the rounded corner is movably overlapped on the inner side wall surface of the casting mold and the surface of the casting sand.

[0010] Preferably, ventilation holes are provided on both side surfaces of the casting mold and at the bottom edge thereof, and the outer surface of the hollow casing is movably overlapped on the inner wall surface of the casting mold.

[0011] Preferably, notches are provided on both side surfaces of the trumpet-shaped funnel, and limiting sleeves are provided on both side surfaces of the trumpet-shaped funnel and at the edges of the notches, and a motor is fixedly mounted on the inner side wall of the limiting sleeve.

[0012] Preferably, a turntable is fixedly mounted on the output end of the motor, and a push-pull rod arranged on the inner wall surface of the notch is movably sleeved on the outer surface of the turntable.

[0013] Preferably, the other end of the push-pull rod is movably sleeved on the outer surface of the hollow slide box, and a blanking net groove is provided on the bottom surface of the hollow slide box. The inner wall surfaces on both sides of the trumpet-shaped funnel are fixedly connected to the limiting strip 2.

[0014] Preferably, the outer surface of the hollow slide box is movably sleeved on the outer surface of the limit strip 2, the inner walls on both sides of the hollow slide box are fixedly connected with swing soft strips, and the inner wall surface of the hollow slide box is fixedly connected with a limit gear disk.

[0015] Preferably, a swing housing plate is movably sleeved on the outer surface of the position-limiting gear disc, and a transmission gear disc is movably sleeved on the inner wall of the swing housing plate and located on the outer surface of the position-limiting gear disc.

[0016] Preferably, a magnetic rod is fixedly connected to the outer surface of the transmission gear plate, a magnetic screen is provided on the bottom inner wall surface of the swing shell plate, and a screening mesh plate is provided on the bottom outer surface of the swing shell plate.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The present invention discloses a foundry sand pretreatment device that cooperates with a hollow slide box to screen iron chips from the foundry sand and drains the foundry sand into the interior of the foundry mold through a trumpet-shaped funnel. At this time, an electric motor rotates a threaded rod, causing the limit slider to drive the foundry mold to move to the vertical bottom position of a hydraulic rod. At this time, the hydraulic rod presses down the hollow casing, compacting the fluffy foundry sand inside the foundry mold, thereby maintaining the compactness of the foundry sand and imitating the casting shape.

[0019] 2. The present invention discloses a foundry sand pretreatment device that, in conjunction with a gas permeability tester, infuses gas into the interior of a trachea, allowing a pressure source of a certain volume and initial pressure to exhaust gas through an exhaust valve and sand sample. A timer begins when the pressure of the gas source drops to a certain pressure value P1. After a specific period of time, the pressure of the gas source is reduced to P2. The gas permeability of the foundry sand is tested under the condition that the size, compaction level, initial pressure of the gas source, and the range of gas source pressure variation are all fixed values. The downward pressure of the hydraulic rod can be varied, so that the foundry sand can form different compactions according to different pressures, thereby achieving the effect of the gas permeability test treatment on the foundry sand.

[0020] 3. The foundry sand pretreatment device of the present invention cooperates with an electric motor to rotate the threaded rod in the opposite direction, so that the casting mold moves to the top surface of the blanking port. At this time, the gravity of the casting sand inside the casting mold is used to press down the swinging bottom plate, so that the surface of the swinging bottom plate overlaps the top outer surface of the sliding chute. The casting sand, which is no longer blocked, will fall into the interior of the sliding chute under its own gravity for recovery, thereby undergoing secondary recycling of the casting sand.

[0021] 4. The present invention describes a foundry sand pretreatment device. After cleaning the foundry sand, the foundry mold is moved to the bottom surface of the trumpet-shaped funnel under the push of the threaded rod, and then the foundry sand is filled for the second time. Under the continuous movement of the threaded rod, it is moved to the bottom edge position of the hollow casing for rolling treatment, and the newly filled foundry sand is subjected to secondary inspection treatment. Under the back-and-forth transmission of the threaded rod, the foundry sand can be directly filled, compacted, inspected and discharged, maintaining an autonomous fluidity and process effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 is a perspective view of the present invention;

[0024] Figure 2 It is a cutaway perspective view of the foundry sand processing station of the present invention;

[0025] Figure 3 It is a partially cutaway perspective view of the foundry sand processing station of the present invention;

[0026] Figure 4 It is a cutaway perspective view of the trumpet-shaped funnel of the present invention;

[0027] Figure 5 It is a cross-sectional swing perspective view of the hollow slide box in the present invention;

[0028] Figure 6 This is a sectional perspective view of the swinging housing plate of the present invention;

[0029] Figure 7 It is a three-dimensional diagram of the support frame in the present invention;

[0030] Figure 8 It is an expanded three-dimensional view of the casting mold in the present invention.

[0031] In the figure: 11, casting sand processing table; 111, limit bar 1; 112, electric motor; 113, threaded rod; 114, limit groove; 115, drop opening; 116, slide chute; 12, support frame; 121, hydraulic rod; 122, air permeability tester; 123, air pipe; 124, hollow casing; 13, trumpet-shaped funnel; 131, limit casing; 132, turntable; 133, push-pull rod; 134, Limiting bar 2; 135, hollow slide box; 136, swinging soft plate; 137, blanking mesh trough; 138, swinging shell plate; 139, magnetic screen; 1310, screening mesh plate; 1311, limiting toothed disc; 1312, transmission toothed disc; 1313, magnetic rod; 14, casting mold; 141, limiting slider; 142, swinging bottom plate; 143, rounded corners; 144, air vents; 145, casting sand. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0033] like Figure 1-Figure 5 and Figures 7 and 8 As shown, a foundry sand pretreatment device according to an embodiment of the present invention comprises a trumpet-shaped funnel 13 and a casting mold 14 movably sleeved on the bottom surface of the trumpet-shaped funnel 13, a limiting slider 141 is fixedly installed on both side surfaces of the casting mold 14, a hollow slide box 135 is movably sleeved on the inner wall surface of the trumpet-shaped funnel 13, the trumpet-shaped funnel 13, the hollow slide box 135 and the casting mold 14 are filled with casting sand 145, a hollow casing 124 is provided on the top surface of the casting mold 14, a hydraulic rod 121 is fixedly installed on the top surface of the hollow casing 124, a support frame 12 is fixedly installed on the top surface of the hydraulic rod 121, and the support frame 12 is fixedly installed on the top surface of the support frame 12. 2, an air permeability measuring instrument 122 is fixedly installed on the inner wall surfaces on both sides of the air permeability measuring instrument 122, an air pipe 123 is fixedly connected to the output end of the air permeability measuring instrument 122, and the other end of the air pipe 123 is fixedly connected to the top surface of the hollow casing 124. A threaded rod 113 is movably sleeved on the inner wall surface of the limiting slider 141, and an electric motor 112 is fixedly installed on one end of the threaded rod 113. A casting sand processing platform 11 is fixedly installed on the outer surface of the electric motor 112. A blanking port 115 is provided on one edge position of the top side of the casting sand processing platform 11, and a sliding groove 116 is provided on the bottom surface of the casting sand processing platform 11 and at the bottom edge position of the blanking port 115.

[0034] The hollow slide box 135 is used to screen the iron chips from the casting sand 145, and the casting sand 145 is drained into the interior of the casting mold 14 through the trumpet-shaped funnel 13. At this time, the threaded rod 113 is rotated by the electric motor 112, and the limit slider 141 drives the casting mold 14 to move to the vertical bottom position of the hydraulic rod 121. At this time, the hydraulic rod 121 is used to press down the hollow casing 124, compacting the fluffy casting sand 145 inside the casting mold 14, thereby maintaining the compactness of the casting sand 145 and making it imitate the casting shape.

[0035] At this time, the air permeability tester 122 is used to infuse air into the air pipe 123, allowing an air pressure source with a certain volume and initial pressure to be exhausted through the exhaust valve and the sand sample. When the air source pressure drops to a certain pressure value P1, the timing is started. After a specific time, the air source pressure is reduced to P2. Under the condition that the size, compactness, initial air source pressure and air source pressure variation range are all fixed values, the air permeability of the foundry sand 145 is checked. At the same time, the downward pressure of the hydraulic rod 121 can be changed, so that the foundry sand 145 can form different compactness according to different pressures, thereby achieving the effect of the air permeability test treatment of the foundry sand 145.

[0036] At this time, the electric motor 112 is coordinated to rotate the threaded rod 113 in the opposite direction, so that the casting mold 14 moves to the top surface of the blanking port 115. At this time, the weight of the casting sand 145 inside the casting mold 14 is used to press down the swing bottom plate 142, so that the surface of the swing bottom plate 142 overlaps the top outer surface of the sliding chute 116. The casting sand 145 without obstruction will fall into the interior of the sliding chute 116 under its own weight for recovery, and then the casting sand 145 is recycled for secondary use.

[0037] After cleaning the casting sand 145, the casting mold 14 is moved to the bottom surface of the trumpet-shaped funnel 13 under the push of the threaded rod 113, and then the casting sand 145 is filled for the second time. Under the continuous movement of the threaded rod 113, it is moved to the bottom edge position of the hollow shell 124 for rolling treatment, and the newly filled casting sand 145 is subjected to secondary inspection. Under the back and forth transmission of the threaded rod 113, the casting sand 145 can be directly filled, compacted, inspected and discharged, maintaining an autonomous fluidity and process effect.

[0038] like Figures 1 to 8As shown, a swing bottom plate 142 is swingably connected to the bottom surface of the casting mold 14, and the bottom surface of the swing bottom plate 142 is movably overlapped on the top surface of the lower groove 116. A limit strip 111 is provided on the top surface of the casting sand processing table 11 and is located at the edge positions on both sides. A limit groove 114 is provided on the outer surface of the casting sand processing table 11. A rounded corner 143 is provided on one side surface of the swing bottom plate 142. The outer surface of the rounded corner 143 is movably overlapped on the inner wall surface of the casting mold 14 and the casting sand. On the surface of 145, air holes 144 are provided on both sides of the casting mold 14 and at the bottom edge position. The outer surface of the hollow shell 124 is movably overlapped on the inner wall of the casting mold 14. A notch is provided on both sides of the trumpet-shaped funnel 13. A limit shell 131 is provided on both sides of the trumpet-shaped funnel 13 and at the edge position of the notch. A motor is fixedly installed on the inner wall of the limit shell 131. A turntable 132 is fixedly installed on the output end of the motor. The outer surface of the turntable 132 The push-pull rod 133 is movably sleeved on the inner wall of the notch, and the other end of the push-pull rod 133 is movably sleeved on the outer surface of the hollow slide box 135. A blanking net groove 137 is provided on the bottom surface of the hollow slide box 135. The inner walls on both sides of the trumpet-shaped funnel 13 are fixedly connected to the limiting strip 2 134, and the outer surface of the hollow slide box 135 is movably sleeved on the outer surface of the limiting strip 2 134. The inner walls on both sides of the hollow slide box 135 are fixedly connected with swing soft strips 136. A limiting toothed disc 1311 is fixedly connected, and a swinging shell plate 138 is movably sleeved on the outer surface of the limiting toothed disc 1311. A transmission toothed disc 1312 is movably sleeved on the inner wall of the swinging shell plate 138 and located on the outer surface of the limiting toothed disc 1311. A magnetic rod 1313 is fixedly connected to the outer surface of the transmission toothed disc 1312. A magnetic screen 139 is provided on the inner wall surface of the bottom of the swinging shell plate 138, and a screening mesh plate 1310 is provided on the outer surface of the bottom of the swinging shell plate 138.

[0039] After the casting sand 145 is poured from the inside of the packaging bag into the inside of the swing shell plate 138, the motor is used to rotate the turntable 132, and the push-pull rod 133 is driven by the turntable 132 to move back and forth left and right, and the hollow slide box 135 is pulled back and forth left and right by the push-pull rod 133. Since the center of gravity of the casting sand 145 is located at the bottom of the swing shell plate 138, when the center of gravity is lower, the swing shell plate 138 will swing back and forth left and right due to inertia. At this time, during the swinging process, the magnetic screen 139 and the screening mesh plate 1310 are used to screen and loosen the casting sand 145 inside the swing shell plate 138.

[0040] The casting sand 145 filled in the swing shell plate 138 will first contact the surface of the magnetic rod 1313, and absorb the iron filings remaining in the casting sand 145. Since the limit gear plate 1311 is fixed to the inner wall of the hollow slide box 135, when the swing shell plate 138 swings, the transmission gear plate 1312 on the inner wall will rotate with the limit gear plate 1311 as the axis point. Since the limit gear plate 1311 is in a stationary state at this time, the transmission gear plate 1312 will slide along the surface of the limit gear plate 1311, causing the magnetic rod 1313 to rotate, so that the iron filings can be evenly attached to the surface of the magnetic rod 1313.

[0041] As the swinging shell plate 138 continues to swing, the magnetic screen 139 is used to perform secondary screening on the bottom layer of the foundry sand 145 to filter out debris, and the foundry sand 145 is evenly screened through the screening mesh plate 1310, so that the foundry sand 145 is kept at a high fluffiness. The screened foundry sand 145 will accumulate in the blanking mesh groove 137, and under the swing of the hollow slide box 135, the foundry sand 145 will be laid relatively flat inside the casting mold 14.

[0042] Working principle: After the casting sand 145 is poured from the inside of the packaging bag into the inside of the swing shell plate 138, the motor is used to rotate the turntable 132, and the push-pull rod 133 is driven by the turntable 132 to move back and forth left and right, and the hollow slide box 135 is pulled back and forth left and right by the push-pull rod 133. Since the center of gravity of the casting sand 145 is located at the bottom of the swing shell plate 138, when the center of gravity is lower, the swing shell plate 138 will swing back and forth left and right due to inertia. At this time, during the swinging process, the magnetic screen 139 and the screening mesh plate 1310 are used to screen and loosen the casting sand 145 inside the swing shell plate 138.

[0043] The casting sand 145 filled in the swing shell plate 138 will first contact the surface of the magnetic rod 1313, and absorb the iron filings remaining in the casting sand 145. Since the limit gear plate 1311 is fixed to the inner wall of the hollow slide box 135, when the swing shell plate 138 swings, the transmission gear plate 1312 on the inner wall will rotate with the limit gear plate 1311 as the axis point. Since the limit gear plate 1311 is in a stationary state at this time, the transmission gear plate 1312 will slide along the surface of the limit gear plate 1311, causing the magnetic rod 1313 to rotate, so that the iron filings can be evenly attached to the surface of the magnetic rod 1313.

[0044] The hollow slide box 135 is used to screen the iron chips from the casting sand 145, and the casting sand 145 is drained into the interior of the casting mold 14 through the trumpet-shaped funnel 13. At this time, the threaded rod 113 is rotated by the electric motor 112, and the limit slider 141 drives the casting mold 14 to move to the vertical bottom position of the hydraulic rod 121. At this time, the hydraulic rod 121 is used to press down the hollow casing 124, compacting the fluffy casting sand 145 inside the casting mold 14, thereby maintaining the compactness of the casting sand 145 and making it imitate the casting shape.

[0045] At this time, the air permeability tester 122 is used to infuse air into the air pipe 123, allowing an air pressure source with a certain volume and initial pressure to be exhausted through the exhaust valve and the sand sample. When the air source pressure drops to a certain pressure value P1, the timing is started. After a specific time, the air source pressure is reduced to P2. Under the condition that the size, compactness, initial air source pressure and air source pressure variation range are all fixed values, the air permeability of the foundry sand 145 is checked. At the same time, the downward pressure of the hydraulic rod 121 can be changed, so that the foundry sand 145 can form different compactness according to different pressures, thereby achieving the effect of the air permeability test treatment of the foundry sand 145.

[0046] At this time, the electric motor 112 is coordinated to rotate the threaded rod 113 in the opposite direction, so that the casting mold 14 moves to the top surface of the blanking port 115. At this time, the weight of the casting sand 145 inside the casting mold 14 is used to press down the swing bottom plate 142, so that the surface of the swing bottom plate 142 overlaps the top outer surface of the sliding chute 116. The casting sand 145 without obstruction will fall into the interior of the sliding chute 116 under its own weight for recovery, and then the casting sand 145 is recycled for secondary use.

[0047] After cleaning the casting sand 145, the casting mold 14 is moved to the bottom surface of the trumpet-shaped funnel 13 under the push of the threaded rod 113, and then the casting sand 145 is filled for the second time. Under the continuous movement of the threaded rod 113, it is moved to the bottom edge position of the hollow shell 124 for rolling treatment, and the newly filled casting sand 145 is subjected to secondary inspection. Under the back and forth transmission of the threaded rod 113, the casting sand 145 can be directly filled, compacted, inspected and discharged, maintaining an autonomous fluidity and process effect.

[0048] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A foundry sand pretreatment device, comprising a trumpet-shaped funnel (13) and a casting mold (14) movably sleeved on the bottom surface of the trumpet-shaped funnel (13), characterized in that: Limiting sliders (141) are fixedly installed on the two side surfaces of the casting mold (14), a hollow slide box (135) is movably sleeved on the inner wall surface of the trumpet-shaped funnel (13), the interior of the trumpet-shaped funnel (13), the hollow slide box (135) and the casting mold (14) are filled with casting sand (145), a hollow casing (124) is provided on the top surface of the casting mold (14), a hydraulic rod (121) is fixedly installed on the top surface of the hollow casing (124), a support frame (12) is fixedly installed on the top surface of the hydraulic rod (121), and an air permeability measuring instrument (122) is fixedly installed on the inner wall surfaces of both sides of the support frame (12). An air pipe (123) is fixedly connected to the output end of the measuring instrument (122), and the other end of the air pipe (123) is fixedly connected to the top surface of the hollow casing (124). A threaded rod (113) is movably sleeved on the inner wall surface of the limiting slider (141). An electric motor (112) is fixedly mounted on one end of the threaded rod (113). A casting sand processing table (11) is fixedly mounted on the outer surface of the electric motor (112). A blanking port (115) is provided on the edge of one side of the top of the casting sand processing table (11). A sliding groove (116) is provided on the bottom surface of the casting sand processing table (11) and at the bottom edge of the blanking port (115). Notches are provided on both side surfaces of the trumpet-shaped funnel (13), and limiting sleeves (131) are provided on both side surfaces of the trumpet-shaped funnel (13) and at the edges of the notches, and a motor is fixedly mounted on the inner wall surface of the limiting sleeve (131); A rotating disk (132) is fixedly mounted on the output end of the motor, and a push-pull rod (133) arranged on the inner wall surface of the notch is movably sleeved on the outer surface of the rotating disk (132); The other end of the push-pull rod (133) is movably sleeved on the outer surface of the hollow slide box (135), and a blanking net groove (137) is provided on the bottom surface of the hollow slide box (135). The inner wall surfaces on both sides of the trumpet-shaped funnel (13) are fixedly connected to the second limiting strip (134); The outer surface of the hollow sliding box (135) is movably sleeved on the outer surface of the second limiting strip (134), the inner wall surfaces on both sides of the hollow sliding box (135) are fixedly connected with swinging soft strips (136), and the inner wall surface of the hollow sliding box (135) is fixedly connected with a limiting toothed disc (1311); A swing housing plate (138) is movably sleeved on the outer surface of the position-limiting toothed disc (1311), and a transmission toothed disc (1312) is movably sleeved on the inner wall of the swing housing plate (138) and located on the outer surface of the position-limiting toothed disc (1311); A magnetic rod (1313) is fixedly connected to the outer surface of the transmission gear plate (1312), a magnetic screen (139) is provided on the inner wall surface of the bottom of the swing shell plate (138), and a screening mesh plate (1310) is provided on the outer surface of the bottom of the swing shell plate (138).

2. A foundry sand pretreatment device according to claim 1, characterized in that: A swinging bottom plate (142) is swingably connected on the bottom surface of the casting mold (14), and the bottom surface of the swinging bottom plate (142) is movably overlapped on the top surface of the lower slide groove (116). A limiting strip (111) is provided on the top surface of the casting sand processing table (11) and at the edge positions on both sides, and a limiting groove (114) is provided on the outer surface of the casting sand processing table (11).

3. A foundry sand pretreatment device according to claim 2, characterized in that: A rounded corner (143) is provided on one side surface of the swing bottom plate (142), and the outer surface of the rounded corner (143) is movably overlapped on the inner wall surface of the casting mold (14) and the surface of the casting sand (145).

4. A foundry sand pretreatment device according to claim 3, characterized in that: Air vents (144) are provided on both side surfaces of the casting mold (14) and at the bottom edge thereof, and the outer surface of the hollow casing (124) is movably overlapped on the inner wall surface of the casting mold (14).

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