A Lost Foam Casting Sand Processing System

Abstract

This invention relates to the field of lost foam casting material processing technology, specifically providing a lost foam casting sand processing system, including a conveyor support with an inner conveyor belt and an outer conveyor belt wound around it. The conveyor support is configured with a first section, a second section, and a third section. When the outer conveyor belt passes through the first section, the outer layer of casting sand slides down, while the inner layer of casting sand, being closer to the conveyor belt, is conveyed further, thereby achieving the exchange and tumbling of the inner and outer layers, exposing the inner layer of ferrous metal fragments to the outer layer. When passing through the second section, the casting sand is squeezed and kneaded, breaking large pieces of casting sand into smaller pieces, exposing the encapsulated or agglomerated ferrous metal fragments and preventing them from being missed. When passing through the third section, the casting sand is lifted up, shortening the distance between the ferrous metal fragments and the magnetic separator, increasing the exposure time of the fragments in the magnetic field, and making it easier to capture even weakly magnetic flaky fragments.

Description

Technical Field

[0001] This invention relates to the field of lost foam casting material processing technology, and in particular to a lost foam casting sand processing system. Background Technology

[0002] The lost foam casting sand treatment system is an indispensable part of the lost foam casting process. It is mainly used to process the casting sand used in the casting process to ensure the quality and performance of the casting sand and meet the requirements of casting production. The magnetic separator plays an important role in the lost foam casting sand treatment system. At present, most sand treatment sections in the production line require the use of magnetic separators. The magnetic separator is used to remove ferromagnetic impurities such as iron filings and iron powder from the casting sand. It uses magnetic field force to adsorb and separate ferromagnetic substances, improve the purity of the casting sand, and avoid impurities from affecting the quality of castings.

[0003] For example, Chinese patent CN219943188U discloses a suspended magnetic separator. This solution uses the cooperation of a first baffle plate and a first partition plate to initially divert the foundry sand accumulated on the feed conveyor belt, so that the foundry sand can only pass through the gap between each set of first partition plates. Then, the motor is started, and the second mounting plate moves back and forth under the action of the transmission shaft and cam, so that the second baffle plate and the second partition plate can evenly disperse the foundry sand, thereby facilitating the magnetic separator to adsorb it.

[0004] Because the metals in foundry sand come from different sources, have different forms, and different particle sizes, some metals are difficult to be adsorbed during magnetic separation. Some blocky metal particles that are free in the foundry sand are easily adsorbed, but some metal debris or microparticles that form agglomerates or inclusions with the foundry sand are difficult to be adsorbed by the magnetic separator above. Therefore, the magnetic separation effect of foundry sand is poor, resulting in a low removal rate of metal debris in foundry sand. Summary of the Invention

[0005] Therefore, it is necessary to provide a lost foam casting sand treatment system to address the problem of low metal debris removal rate caused by poor magnetic separation of current casting sand.

[0006] The above objectives are achieved through the following technical solutions:

[0007] A lost foam casting sand treatment system includes:

[0008] A conveyor support is provided, with an inner conveyor belt wound around it. An outer conveyor belt is connected to the outer periphery of the inner conveyor belt. The inner conveyor belt is used to drive the outer conveyor belt to rotate, and the outer conveyor belt is used to transport casting sand.

[0009] A magnetic separator, located above the conveyor belt, is used to adsorb ferrous metal impurities from foundry sand.

[0010] The first section is located on the conveyor support. The conveyor surface of the first section supporting the outer conveyor belt forms two first protrusions with a gap between the two first protrusions.

[0011] The second section is located behind the first section. The second section supports the conveying surface of the outer conveyor belt, forming two second protrusions with a gap between them. The two second protrusions are close to each other and far apart.

[0012] The third section is located behind the second section. The third section supports the outer conveyor belt and forms a third protrusion. The top of the third protrusion moves up and down repeatedly.

[0013] Furthermore, two first lifting rollers are provided on the first section of the conveyor support. The two first lifting rollers are arranged along the width direction of the outer conveyor belt. The two first lifting rollers are on the same plane and parallel to each other. The two first lifting rollers are higher than the inner conveyor belt. A first magnetic roller is provided between the two first lifting rollers. The first magnetic roller is used to attract the outer conveyor belt. The first magnetic roller is parallel to the two first lifting rollers and is lower than the inner conveyor belt.

[0014] Furthermore, a rotating disk is provided in the first section. The rotating disk rotates intermittently and then resets, and can change the direction of rotation. The rotating disk is connected to two first lifting rollers and one first magnetic suction roller.

[0015] Furthermore, two second lifting rollers are provided on the second section of the conveyor support. The two second lifting rollers are arranged along the width direction of the outer conveyor belt. The two second lifting rollers are on the same plane and parallel to each other. The bottom of the two second lifting rollers is higher than the inner conveyor belt. The two second lifting rollers can move closer or further away from each other. A second magnetic roller is provided between the two second lifting rollers. The second magnetic roller is parallel to the second lifting rollers and is lower than the inner conveyor belt.

[0016] Furthermore, two first telescopic cylinders are installed in the second section. The fixed ends of the two first telescopic cylinders are connected to the second section of the conveying bracket, and the telescopic ends of the two first telescopic cylinders are respectively connected to two second lifting rollers.

[0017] Furthermore, two third lifting rollers are provided in the third section of the conveyor support. The two third lifting rollers are arranged along the width direction of the outer conveyor belt. The two third lifting rollers are on the same plane and parallel to each other. A third magnetic roller is provided between the two third lifting rollers. The third magnetic roller is parallel to the third lifting roller and attracts the top of the third protrusion.

[0018] Furthermore, a second telescopic cylinder is installed in the third section. The second telescopic cylinder is vertically arranged and its fixed end is fixedly connected in the third section. The telescopic end of the second telescopic cylinder is connected to the third magnetic suction roller.

[0019] Furthermore, a fourth section is provided on the conveyor support, which is located behind the third section. The fourth section supports the conveyor surface of the outer conveyor belt to form a fourth protrusion. The degree of protrusion of the fourth protrusion is greater than that of the third protrusion. The top of the fourth protrusion moves up and down repeatedly at intervals and the speed of movement is faster than that of the third protrusion.

[0020] Furthermore, two fourth lifting rollers are provided in the fourth section. The two fourth lifting rollers are arranged along the width direction of the outer conveyor belt. The two fourth lifting rollers are on the same plane and parallel to each other. A fourth magnetic roller is provided between the two fourth lifting rollers. The fourth magnetic roller is parallel to the fourth lifting roller and attracts the top of the fourth protrusion.

[0021] Furthermore, a third telescopic cylinder is installed in the fourth section. The third telescopic cylinder is vertically arranged, with its fixed end fixedly connected to the fourth section and its telescopic end connected to the fourth magnetic suction roller.

[0022] The beneficial effects of this invention are:

[0023] This invention utilizes a conveyor support with three sections: a first section, a second section, and a third section. In the first section, two first protrusions cause the outer layer of casting sand to slide off the conveyor belt as it passes, while the inner layer, being closer to the belt, is conveyed further, thus achieving an exchange and tumbling of the inner and outer layers. This exposes the inner layer of ferrous metal fragments to the outer layer, facilitating magnetic separation. In the second section, the gap between the two second protrusions can be adjusted. As the casting sand passes, it is squeezed and kneaded, breaking large pieces into smaller ones, exposing the encapsulated or agglomerated ferrous metal fragments and preventing them from being missed. In the third section, the top of the third protrusion moves up and down repeatedly, lifting the casting sand and shortening the distance between the ferrous metal fragments and the magnetic separator. This increases the exposure time of the fragments in the magnetic field, making it easier to capture even weakly magnetic, flaky fragments.

[0024] This invention features a rotating disk within the first section of the conveyor support. The rotating disk connects two first lifting rollers and a first magnetic roller. The rotating disk drives the two first lifting rollers and the first magnetic roller to rotate intermittently and then reset, and can also rotate in the opposite direction. This causes the first protrusion formed in the first section to have an inclined surface, thereby changing the distribution of casting sand on the outer conveyor belt. This allows the casting sand to swing left and right on the outer conveyor belt, further improving the magnetic separator's adsorption effect on ferrous metal impurities.

[0025] This invention improves the removal rate by setting a fourth section on the conveyor support, where the fourth protrusion of the fourth section is more prominent than the third protrusion, the top of which is closer to the magnetic separator, and the top moves up and down faster. This causes the outer conveyor belt to vibrate, allowing the fine powder, chips, particles and other ferrous metal debris adsorbed on its surface to detach instantly and be adsorbed by the magnetic separator. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a lost foam casting sand treatment system provided in an embodiment of the present invention;

[0027] Figure 2 for Figure 1 A cross-sectional view of a lost foam casting sand treatment system provided in one embodiment;

[0028] Figure 3 for Figure 2 A partially enlarged view of part A of the lost foam casting sand treatment system provided in one embodiment;

[0029] Figure 4 for Figure 2 A partially enlarged view of part B of the lost foam casting sand treatment system provided in one embodiment;

[0030] Figure 5 for Figure 2 A partially enlarged view of part C of the lost foam casting sand treatment system provided in one embodiment;

[0031] Figure 6 for Figure 2 A partial enlarged view of part D of the lost foam casting sand treatment system provided in one embodiment;

[0032] Figure 7 This is a schematic diagram of the structure of an outer conveyor belt of a lost foam casting sand processing system provided in an embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of the structure of an outer conveyor belt of a lost foam casting sand processing system provided in an embodiment of the present invention from another angle;

[0034] Figure 9 This is a schematic diagram of the conveying support structure of a lost foam casting sand processing system according to an embodiment of the present invention;

[0035] Figure 10 This is an isometric view of the conveyor support of a lost foam casting sand processing system provided in an embodiment of the present invention.

[0036] in:

[0037] 100. Conveyor support; 110. Conveyor roller; 120. Drive motor; 130. Inner conveyor belt; 140. Outer conveyor belt; 150. Flexible metal strip; 160. Partition plate;

[0038] 200, First section; 210, First protrusion; 220, First lifting roller; 230, First magnetic suction roller; 240, First obstacle avoidance telescopic cylinder; 250, Rotating disk; 260, Rotating motor;

[0039] 300, Second section; 310, Second protrusion; 320, Second lifting roller; 330, Second magnetic suction roller; 340, First telescopic cylinder; 350, Sliding frame; 360, Second obstacle avoidance telescopic cylinder;

[0040] 400, Third section; 410, Third protrusion; 420, Third lifting roller; 430, Third magnetic suction roller; 440, Second telescopic cylinder; 450, Third obstacle avoidance telescopic cylinder;

[0041] 500, Fourth Section; 510, Fourth Protrusion; 520, Fourth Lifting Roller; 530, Fourth Magnetic Adsorption Roller; 540, Third Telescopic Cylinder; 550, Fourth Obstacle Avoidance Telescopic Cylinder;

[0042] 600. Magnetic separator. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0044] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not 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 invention.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0046] The following reference Figures 1-10This invention describes a lost foam casting sand processing system.

[0047] A lost foam casting sand treatment system is suitable for removing ferrous metal debris from casting sand. It includes a conveyor support 100 with an inclined upper surface. An inner conveyor belt 130 is wound around the conveyor support 100. Conveyor rollers 110 are respectively installed at both ends of the conveyor support 100. A drive motor 120 is also installed on the support, driving one of the conveyor rollers 110 to rotate. The conveyor roller 110 drives the inner conveyor belt 130 to rotate. An outer conveyor belt 140 is connected to the outer periphery of the inner conveyor belt 130, driving the outer conveyor belt 140 to rotate. The conveying surface of the outer conveyor belt 140 is used to convey casting sand, transporting the casting sand from the lower end to the higher end of the conveyor support 100. A magnetic separator 600 (which is existing technology and will not be described in detail here) is installed on the conveyor support 100. The magnetic separator 600 generates a strong magnetic field. The magnetic separator 600 does not contact the outer conveyor belt 140. When the foundry sand conveyed by the outer conveyor belt 140 passes under the magnetic separator 600, the magnetic separator 600 can adsorb the ferrous metal fragments in the foundry sand, causing the ferrous metal fragments to detach from the foundry sand. However, the magnetic separator 600 in the existing technology is not very effective at adsorbing ferrous metal fragments, resulting in poor casting performance. The removal rate of ferrous metal fragments in foundry sand is low. Due to the different sources, shapes, and particle sizes of ferrous metal fragments in foundry sand, some ferrous metal fragments are difficult to adsorb during magnetic separation. Some ferrous metal fragments or particles that form agglomerates or inclusions with foundry sand are difficult to be adsorbed by the magnetic separator 600 above. Some flaky ferrous metal fragments are even more difficult to be adsorbed by the magnetic separator 600 above due to their weak magnetism. Therefore, the removal rate of ferrous metal fragments in foundry sand is low.

[0048] Based on this, the present invention provides multiple sections on the conveying support 100. When the outer conveyor belt 140 passes through each section, it forms different shapes, so that different ferrous metal fragments in the casting sand on the outer conveyor belt 140 are sequentially adsorbed by the magnetic separator 600, thereby improving the removal rate of ferrous metal fragments in the casting sand.

[0049] A first section 200 is provided on the conveyor support 100. When the outer conveyor belt 140 passes through the first section 200, the conveying surface is supported by two first protrusions 210. There is a gap between the two first protrusions 210. When the foundry sand on the outer conveyor belt 140 passes through the two first protrusions 210, the foundry sand on the outer layer of the outer conveyor belt 140 will slide down on the slope formed by the upper and lower first protrusions 210, so that the inner layer of foundry sand and the outer layer of foundry sand move at different speeds. The inner layer of foundry sand is closer to the outer conveyor belt 140, so the inner layer of foundry sand can be conveyed a higher distance by the outer conveyor belt 140, thereby separating the inner and outer layers of foundry sand. This achieves the effect of exchanging and turning the inner and outer layers of foundry sand, so that the iron metal fragments in the inner layer of foundry sand are turned to the outer layer, which is convenient for the magnetic separator 600 to adsorb.

[0050] Understandably, the two first protrusions 210 of the first section 200 create a speed difference between the inner and outer layers of casting sand, enabling the casting sand to turn over automatically. The inner layer of casting sand is transported further because it is closer to the outer conveyor belt 140, while the outer layer of casting sand is turned over due to slippage, exposing the iron debris originally buried inside the casting sand to the surface. This process can be completed without additional power, solving the limitation of traditional magnetic separation that can only adsorb surface iron metal debris.

[0051] A second section 300 is provided on the conveying support 100, and the second section 300 is located behind the first section 200 (within a certain distance). Figure 2 As shown, the conveying direction of the foundry sand is from left to right, and "behind" refers to the front side of the conveying direction (that is, the second section 300 is located to the right of the first section 200). When the outer conveyor belt 140 passes through the second section 300, the conveying surface of the outer conveyor belt 140 will be supported by two second protrusions 310. There is a gap between the two second protrusions 310 and the size of the gap can be changed. When the foundry sand on the outer conveyor belt 140 passes through the gap between the two second protrusions 310, it can be squeezed and kneaded, thereby crushing large pieces of foundry sand into small pieces of foundry sand, so that the iron metal fragments that form agglomerates or inclusions of foundry sand can be exposed, and then the magnetic separator 600 can adsorb these exposed iron metal fragments to avoid omission.

[0052] Understandably, the second section 300 uses an adjustable gap double-protrusion structure to squeeze and knead the casting sand, forcibly separating the iron fragments (such as iron pellets and iron slag) that were originally wrapped or agglomerated by the casting sand. This mechanical crushing action directly destroys the bonding force between the fragments and the casting sand, avoiding the omission problem caused by the inability of traditional magnetic separation to penetrate the casting sand layer. It is especially suitable for adhesive impurities mixed in during the casting cleaning process.

[0053] A third section 400 is provided on the conveyor support 100. The third section 400 is located behind the second section 300. When the outer conveyor belt 140 passes through the third section 400, the conveying surface of the outer conveyor belt 140 will be supported by a third protrusion 410. The top of the third protrusion 410 can move up and down, so that the casting sand on the outer conveyor belt 140 can be lifted up when the third protrusion 410 moves up and down. This makes the iron metal impurities in the casting sand closer to the magnetic separator 600, so that the magnetic separator 600 can more easily adsorb the iron metal impurities on the outer conveyor belt 140.

[0054] Understandably, the reciprocating protrusions in the third section 400 shorten the distance between the iron debris and the magnetic separator 600 by lifting the casting sand, while increasing the exposure time of the debris in the magnetic field. For flaky debris with weak magnetic properties, this dynamic lifting effect makes it easier for the magnetic separator 600 to capture it, breaking through the limitations of traditional static adsorption on the shape of the debris.

[0055] By setting multiple sections on the conveying support 100, the sorting effect of ferrous metal fragments in the foundry sand is significantly improved, and the removal rate of ferrous metal fragments in the foundry sand is increased.

[0056] Specifically, such as Figure 2 , Figure 3 , Figure 9 and Figure 10 As shown, to ensure that the outer conveyor belt 140 is supported to form two first protrusions 210 when passing through the first section 200, two first lifting rollers 220 are rotatably arranged within the first section 200 in this embodiment. The two first lifting rollers 220 are arranged along the width direction of the outer conveyor belt 140, are on the same plane and parallel to each other, and are higher than the inner conveyor belt 130. A first magnetic roller 230 is arranged between the two first lifting rollers 220. The height of the first magnetic roller 230 is lower than that of the inner conveyor belt 130, and the first magnetic roller 230 can attract the outer conveyor belt 140, making... The inner circumference of the outer conveyor belt 140 is always in contact with the portion of the two first lifting rollers 220 that is higher than the inner conveyor belt 130. The two first lifting rollers 220 support the outer conveyor belt 140 passing through the first section 200 to raise the two first protrusions 210. At the same time, the first magnetic roller 230 located between the two first lifting rollers 220 attracts the outer conveyor belt 140 between the two first lifting rollers 220, so that there is a gap between the two first protrusions 210 formed by the support of the two first lifting rollers 220. When the casting sand passes through the gap, it can also be turned over between the inner and outer layers, so that the ferrous metal impurities in the casting sand can be better attracted by the magnetic separator 600.

[0057] It should be noted that the structure that causes the outer conveyor belt 140 to be supported by the two first protrusions 210 is not limited to the structure described above, but can also be other structures. For example, the first section 200 of the conveyor bracket 100 can be set in the shape of two first protrusions 210, so that the outer conveyor belt 140 is directly supported by the two first protrusions 210 when passing through the first section 200. Of course, other structures are also possible, and no specific limitation is made here.

[0058] In a further embodiment, such as Figure 3 , Figure 9 and Figure 10 As shown, to improve the tumbling effect of the casting sand passing through the first section 200, the present invention simultaneously mounts two first lifting rollers 220 and one first magnetic roller 230 inside the first section 200 on a rotating disk 250. The rotating disk 250 is rotatably mounted within the first section 200. A rotating motor 260 is installed within the first section 200. The rotating shaft of the rotating motor 260 is coaxial with and fixedly connected to the rotating disk 250. The rotating motor 260 drives the rotating disk 250 to rotate around its own axis. The rotating disk 250 drives the two first lifting rollers 220 and the one first magnetic roller 230 to rotate synchronously, so that the two first lifting rollers 220 and the one first magnetic roller 230 no longer extend along the width direction of the outer conveyor belt 140, but instead form an angle with the outer conveyor belt 140. When the outer conveyor belt 140 passes through the two first lifting rollers 220 and the first magnetic roller 230, it is supported to form an inclined conveying surface, which causes the casting sand on the outer conveyor belt 140 to shift. Specifically, the casting sand shifts to the left and right sides of the conveying direction. It should be noted that the rotating disk 250 in this embodiment works intermittently. For example, every once in a while, the rotating disk 250 will rotate at a certain angle, causing the casting sand on the outer conveyor belt 140 to shift. After a period of time, the rotating disk 250 resets, causing the casting sand on the outer conveyor belt 140 to reset as well. After another period of time, the rotating disk 250 rotates in the opposite direction, causing the casting sand on the outer conveyor belt 140 to shift in the opposite direction. After another period of time, the rotating disk 250 resets again, and so on in a cycle.

[0059] Specifically, such as Figure 2 , Figure 4 , Figure 9 and Figure 10As shown, to enable the outer conveyor belt 140 to form two second protrusions 310 when passing through the second section 300, and for the two second protrusions 310 to move closer to and further away from each other, two second lifting rollers 320 are provided in the second section 300 of this embodiment. The two second lifting rollers 320 are arranged along the width direction of the outer conveyor belt 140, are on the same plane and are parallel to each other, and are higher than the inner conveyor belt 130. A second magnetic roller 330 is provided between the two second lifting rollers 320, and is parallel to the two second lifting rollers 320. The distance between the two second lifting rollers 320 on the inner conveyor belt 130 can be changed, and the second magnetic roller 330 between the two second lifting rollers 320 can also attract the outer conveyor belt 140, so that the outer conveyor belt 140 can completely adhere to the outer periphery of the two second lifting rollers 320. When the distance between the two second lifting rollers 320 is close, the gap formed between them will be reduced. At the same time, the casting sand inside the gap will be squeezed and kneaded, so that the large pieces of casting sand in the casting sand are squeezed and kneaded into small pieces of casting sand. Furthermore, the two second lifting rollers 320 continuously move closer and further away from each other, thereby continuously squeezing and kneading the casting sand that subsequently passes through.

[0060] Specifically, such as Figure 2 , Figure 4 , Figure 9 and Figure 10 As shown, in order to enable the two second lifting rollers 320 to move closer to each other and further away from each other, two first telescopic cylinders 340 are provided in the second section 300. The fixed ends of the two first telescopic cylinders 340 are located in the second section 300, and the telescopic ends of the two first telescopic cylinders 340 are connected to the two second lifting rollers 320. The telescopic ends of the two first telescopic cylinders 340 can move closer to each other and further away from each other, and the two first telescopic cylinders 340 can extend or shorten at the same time. The two first telescopic cylinders 340 drive the two second lifting rollers 320 to continuously move closer to each other and further away from each other, thereby enabling the casting sand to be squeezed and kneaded when passing through the second section 300.

[0061] More specifically, such as Figure 2 , Figure 4 and Figure 9 As shown, in order to connect the two first telescopic cylinders 340 with the two second lifting rollers 320, a sliding frame 350 is fixedly connected to the telescopic end of the two first telescopic cylinders 340. Each sliding frame 350 is provided with two connecting rods, and a rotating ring is provided at the end of the connecting rod. The rotating ring is rotatably connected to both ends of the second lifting roller 320.

[0062] It should be noted that the structure in which the outer conveyor belt 140 is supported by two second protrusions 310 as it passes through the second section 300, and the two second protrusions 310 can move closer and further apart, is not limited to the structure described above. Other structures are also possible. For example, two protrusions that can move closer and further apart can be provided on the conveyor support 100. The shape of the protrusions is the same as that of the second protrusions 310. When the outer conveyor belt 140 passes through the second section 300, it adheres to the two protrusions, and the two protrusions move closer and further apart, thereby squeezing and kneading the casting sand. Of course, other structures are also possible, and no specific limitation is made here.

[0063] Specifically, such as Figure 2 , Figure 5 , Figure 9 and Figure 10 As shown, in this embodiment, two third lifting rollers 420 are provided in the third section 400. The two third lifting rollers 420 are arranged along the width direction of the outer conveyor belt 140, and are on the same plane and parallel to each other. A third magnetic roller 430 is provided between the two third lifting rollers 420. The third magnetic roller 430 is parallel to the two third lifting rollers 420. The two third lifting rollers 420 are higher than the inner conveyor belt 130, and the height of the third magnetic roller 430 is higher than the height of the two third lifting rollers 420. The two third lifting rollers 420 and the third magnetic roller 430 support the conveying surface of the outer conveyor belt 140. The third protrusion 410 is attached to the top of the third protrusion 410 by the third magnetic roller 430. The third magnetic roller 430 can move vertically, allowing the top of the third protrusion 410 to rise and fall repeatedly. At the same time, the third magnetic roller 430 moves at a relatively fast speed in the vertical direction, so that the outer conveyor belt 140 at the top of the third protrusion 410 can lift the casting sand that passes by. At this time, the casting sand is closer to the magnetic separator 600, and the magnetic separator 600's adsorption force on the ferrous metal impurities in the casting sand increases, thereby improving the adsorption effect of the magnetic separator 600 on the ferrous metal impurities and increasing the removal rate of ferrous metal impurities in the casting sand.

[0064] More specifically, such as Figure 2 , Figure 5 and Figure 9As shown, in order to enable the third magnetic roller 430 to move vertically, a second telescopic cylinder 440 is provided in the third section 400. The second telescopic cylinder 440 is vertically arranged, and its fixed end is fixedly connected in the third section 400. The telescopic end of the second telescopic cylinder 440 is connected to the third magnetic roller 430. The telescopic end of the second telescopic cylinder 440 can quickly extend and shorten, thereby driving the third magnetic roller 430 to move quickly. The third magnetic roller 430 can attract the outer conveyor belt 140. When the third magnetic roller 430 moves up and down quickly, it causes the top of the third protrusion 410 formed on the conveying surface of the outer conveyor belt 140 to rise and fall quickly, thereby causing the casting sand on the conveying surface of the outer conveyor belt 140 to be lifted up.

[0065] like Figure 5 and Figure 10 As shown, in order to facilitate the connection between the second telescopic cylinder 440 and the third magnetic roller 430, there are two second telescopic cylinders 440 in this embodiment. Each of the telescopic ends of the two second telescopic cylinders 440 is provided with a rotating ring. The rotating ring is rotatably connected to both ends of the third magnetic roller 430, so as to drive the third magnetic roller 430 to move up and down without affecting the rotation of the third magnetic roller 430.

[0066] It should be noted that the structure that allows the outer conveyor belt 140 to form a third protrusion 410 after passing through the third section 400, and the top of the third protrusion 410 to move up and down, is not limited to the structure described above. Other structures are also possible. For example, a movable protrusion can be provided on the third section 400 of the conveyor support 100. The shape of the protrusion is the same as that of the third protrusion 410. When the outer conveyor belt 140 passes over the protrusion, it can be supported to form the third protrusion 410, and the protrusion can move up and down to lift up the casting sand. Of course, other structures are also possible, and no specific limitation is made here.

[0067] In a further embodiment, after passing through the above three sections, most of the iron metal fragments in the casting sand have been adsorbed by the magnetic separator 600. However, some fine powder, chips, and particles will still remain, which are easily adsorbed on the surface of the outer conveyor belt 140 and are difficult to be adsorbed by the magnetic separator 600 above. The present invention provides a fourth section 500 on the conveyor support 100 to target these fine powder, chips, and particles that are easily adsorbed on the surface of the conveyor belt.

[0068] When the outer conveyor belt 140 passes through the fourth section 500, the fourth section 500 supports the conveying surface of the outer conveyor belt 140 as a fourth protrusion 510. The degree of protrusion of the fourth protrusion 510 is greater than that of the third protrusion 410, and the height of the fourth protrusion 510 is also greater. The top of the fourth protrusion 510 is closer to the magnetic separator 600. Due to the greater degree of protrusion of the fourth protrusion 510, when the foundry sand passes through the fourth protrusion 510, large particles of foundry sand on the outer conveyor belt 140 will slide off the fourth protrusion 510. Only some fine powder, chips, particles, and other iron metal fragments that are easily adsorbed onto the surface of the outer conveyor belt 140 can pass through the fourth protrusion 510. The magnetic separator 600 will pass through the highest point of the fourth protrusion 510 at intervals, and will adsorb some of the iron metal debris. Then, the fourth protrusion 510 will quickly sink and then quickly bulge again, causing the outer conveyor belt 140 of the fourth section 500 to vibrate. This will cause some fine powder, chips, particles and other iron metal debris that are easily adsorbed on the surface of the outer conveyor belt 140 to be instantly detached from the surface of the outer conveyor belt 140. The magnetic separator 600 will then adsorb these instantly detached iron metal debris, thereby removing some fine powder, chips, particles and other iron metal debris that are easily adsorbed on the surface of the outer conveyor belt 140 from the foundry sand, and further improving the removal rate of iron metal impurities in the foundry sand.

[0069] Specifically, such as Figure 2 , Figure 6 , Figure 9 and Figure 10 As shown, the fourth section 500 of this invention is provided with two fourth lifting rollers 520. The two fourth lifting rollers 520 are arranged along the width direction of the outer conveyor belt 140. The two fourth lifting rollers 520 are on the same plane and parallel to each other. The two fourth lifting rollers 520 are higher than the inner conveyor belt 130. A fourth magnetic roller 530 is arranged between the two fourth lifting rollers 520. The height of the fourth magnetic roller 530 is higher than that of the two fourth lifting rollers 520, and the distance between the two fourth lifting rollers 520 is relatively close. The fourth magnetic roller 530 attracts the outer conveyor belt 140 so that the outer conveyor belt 140 can be supported by the two fourth lifting rollers 520 and the fourth magnetic roller 530, thereby supporting the formation of the fourth protrusion 510. The fourth magnetic roller 530 attracts the top of the fourth protrusion 510. The fourth magnetic roller 530 can move up and down rapidly in the vertical direction, thereby causing the outer conveyor belt 140 to vibrate.

[0070] More specifically, such as Figure 2 , Figure 5 , Figure 6 and Figure 9As shown, in order to enable the fourth magnetic roller 530 to move up and down rapidly in the vertical direction, a third telescopic cylinder 540 is provided in the fourth section 500. The telescopic cylinder 540 extends and retracts faster than the telescopic cylinder 440. The fixed end of the third telescopic cylinder 540 is located in the fourth section 500, and the telescopic end of the third telescopic cylinder 540 is connected to the fourth magnetic roller 530. The telescopic end of the third telescopic cylinder 540 extends and retracts rapidly, thereby driving the fourth magnetic roller 530 to move synchronously.

[0071] like Figure 2 , Figure 6 and Figure 10 As shown, in order to connect the third telescopic cylinder 540 with the fourth magnetic roller 530, there are two third telescopic cylinders 540 in this embodiment. Each of the telescopic ends of the two third telescopic cylinders 540 is provided with a rotating ring. The rotating ring is rotatably connected to both ends of the fourth magnetic roller 530, thereby driving the fourth magnetic roller 530 to move up and down without affecting the rotation of the fourth magnetic roller 530.

[0072] It should be noted that the structure that allows the outer conveyor belt 140 to form the fourth protrusion 510 after passing through the fourth section 500 and for the fourth protrusion 510 to move rapidly up and down is not limited to the structure described above. Other structures are also possible. For example, a protrusion capable of rapid up and down movement can be provided in the fourth section 500 of the conveyor support 100. The shape of the protrusion is the same as that of the fourth protrusion 510. When the outer conveyor belt 140 passes through the fourth section 500, it can be supported by the protrusion to form the fourth protrusion 510. The protrusion's rapid up and down movement causes the outer conveyor belt 140 in the fourth section 500 to vibrate. Of course, other structures are also possible, and no specific limitations are made here.

[0073] To ensure that the inner conveyor belt 130 and the outer conveyor belt 140 adapt to the first section 200, the second section 300, the third section 400, and the fourth section 500, the inner conveyor belt 130 and the outer conveyor belt 140 are connected by a partition 160. The inner conveyor belt 130 is not a complete conveyor belt, but is composed of two conveyor belt segments. The two conveyor belt segments are respectively wound around the two ends of the conveyor roller 110, and there is a space between the two conveyor belt segments. This space is used to accommodate the first lifting roller 220, the first magnetic roller 230, the second lifting roller 320, the second magnetic roller 330, the third lifting roller 420, the third magnetic roller 430, the fourth lifting roller 520, and the fourth magnetic roller 530. 30. Multiple partitions 160 are spaced apart on the two sections of the conveyor belt. All partitions 160 are parallel to the conveyor rollers 110 and are spaced at the same intervals. The outer conveyor belts 140 are connected between adjacent partitions 160. The lengths of the first section 200, the second section 300, the third section 400, and the fourth section 500 are the same, so all the outer conveyor belts 140 are of equal length. The outer conveyor belts 140 can accommodate the lifting rollers and magnetic rollers inside each section, so that the outer conveyor belts 140 can contact the outer periphery of the lifting rollers and magnetic rollers in each section, thereby enabling the outer conveyor belts 140 to form a special shape to cope with different ferrous metal impurities in the casting sand.

[0074] It should be noted that, in order to prevent the partition 160 from colliding with the lifting rollers and magnetic rollers inside each section when the outer conveyor belt 140 and the inner conveyor belt 130 are rotating, the lifting rollers and magnetic rollers inside each section will move downward when the partition 160 is about to approach them. This prevents the partition 160 from colliding with the lifting rollers and magnetic rollers inside each section. After the partition 160 passes over the lifting rollers and magnetic rollers in each section, the lifting rollers and magnetic rollers inside each section will move upward and reset, and the lifting rollers and magnetic rollers will support the outer conveyor belt 140 again.

[0075] To enable the vertical movement of the lifting rollers and magnetic rollers in the aforementioned sections, four first obstacle avoidance telescopic cylinders 240 are installed in the first section 200. The four first obstacle avoidance telescopic cylinders 240 are connected to two first lifting rollers 220. The connection method between the four first obstacle avoidance telescopic cylinders 240 and the first lifting rollers 220 is the same as the connection method between the first telescopic cylinder 340 and the second lifting roller 320. Similarly, a second obstacle avoidance telescopic cylinder 360 is installed in the second section 300, a third obstacle avoidance telescopic cylinder 450 is installed in the third section 400, and a fourth obstacle avoidance telescopic cylinder 550 is installed in the fourth section 500.

[0076] It should be noted that, as Figure 8As shown, a flexible metal strip 150 is provided in the middle of the outer conveyor belt 140 of the present invention. The flexible metal strip 150 can be attracted by multiple magnetic rollers, so that the outer conveyor belt 140 is in a taut state. Since the magnetic rollers are all located between the two lifting rollers, when the magnetic rollers attract the outer conveyor belt 140, the outer conveyor belt 140 can be made to fit with the lifting rollers on both sides, so as to maintain the outer conveyor belt 140 in a special shape supported by the first protrusion 210, the second protrusion 310, the third protrusion 410 and the fourth protrusion 510.

[0077] The specific working process of the lost foam casting sand treatment system provided by the present invention will be described in conjunction with the above embodiments:

[0078] The drive motor 120 on the conveyor support 100 is started, and the magnetic separator 600 is started simultaneously. The drive motor 120 drives the conveyor roller 110 to rotate, the conveyor roller 110 drives the inner conveyor belt 130 to rotate, and the inner conveyor belt 130 drives the outer conveyor belt 140 to rotate synchronously. The foundry sand falls onto the outer conveyor belt 140 and is conveyed by the outer conveyor belt 140. When the outer conveyor belt 140 passes through the first section 200 of the conveyor support 100, the two first lifting rollers 220 and the first magnetic suction roller in the first section 200 are activated. 230 descends when it approaches the partition 160 and rises when it moves away from the partition 160, thus preventing the partition 160 from colliding with the first lifting roller 220 and the first magnetic roller 230. After the two first lifting rollers 220 and the first magnetic roller 230 rise, they support the outer conveyor belt 140. The middle first magnetic roller 230 attracts the outer conveyor belt 140, so that the two first lifting rollers 220 simultaneously support the outer conveyor belt 140, thereby forming two first protrusions 210. There is a gap between the two first protrusions 210, specifically as follows: Figure 3 As shown, the casting sand on the outer conveyor belt 140 will tumble when it passes the two first protrusions 210. That is, the casting sand in the outer layer will slide down when it encounters the first protrusion 210, while the casting sand in the inner layer will move up, thereby exchanging the positions of the casting sand in the inner and outer layers, so that the iron metal fragments in the casting sand in the inner layer can be adsorbed by the magnetic separator 600.

[0079] When the outer conveyor belt 140 moves to the second section 300, the two second lifting rollers 320 and the second magnetic roller 330 within the second section 300 descend when they approach the partition 160 and rise when they move away from the partition 160. When the two second lifting rollers 320 and the second magnetic roller 330 rise, their heights are higher than the second magnetic roller 330. The two first telescopic cylinders 340 within the second section 300 reciprocate, causing the two second lifting rollers 320 to move closer and further apart. Since the second magnetic roller 330 is located between the two second lifting rollers 320, it attracts the outer conveyor belt 140, causing the two second lifting rollers 320 to support the outer conveyor belt 140 and form two second protrusions 310, specifically as follows... Figure 4 As shown, when the two second lifting rollers 320 move closer and further apart, they can squeeze and knead the casting sand that enters between the two second protrusions 310, so that the larger casting sand is squeezed and kneaded into smaller casting sand, thereby exposing the iron metal impurities mixed in the larger casting sand, which is convenient for the magnetic separator 600 to adsorb.

[0080] When the outer conveyor belt 140 moves to the third section 400, the two third lifting rollers 420 and the third magnetic roller 430 within the third section 400 descend when they approach the partition 160 and rise when they move away from the partition 160. When the two third lifting rollers 420 and the third magnetic roller 430 rise, the third magnetic roller 430 rises to a higher height than the two third lifting rollers 420, thus supporting the outer conveyor belt 140 as a third protrusion 410, specifically as follows... Figure 5 As shown, the third magnetic roller 430 moves back and forth in the vertical direction, which enables the outer conveyor belt 140 to lift the casting sand. When the casting sand is lifted, it can get closer to the magnetic separator 600, and the magnetic separator 600 can better adsorb the ferrous metal impurities in the casting sand.

[0081] When the outer conveyor belt 140 is conveyed to the fourth section 500, the two fourth lifting rollers 520 and the fourth magnetic roller 530 in the fourth section 500 descend when they approach the partition 160 and rise when they move away from the partition 160. When the two fourth lifting rollers 520 and the fourth magnetic roller 530 rise, the fourth magnetic roller 530 rises to a higher height than the two fourth lifting rollers 520, thus supporting the outer conveyor belt 140 as a fourth protrusion 510, specifically as follows: Figure 6 As shown, the fourth protrusion 510 is more prominent than the third protrusion 410, and the fourth magnetic roller 530 moves back and forth in the vertical direction at a faster speed, which causes the outer conveyor belt 140 to vibrate in the fourth section 500. This causes the iron metal impurities in the casting sand that are easily adsorbed on the outer conveyor belt 140 to instantly detach from the outer conveyor belt 140, thereby enabling the iron metal impurities in the casting sand to be completely adsorbed, thus improving the removal rate of iron metal debris in the casting sand.

[0082] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0083] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A lost foam casting sand treatment system, characterized in that, include: The conveying support has an inner conveyor belt wound around it, and an outer conveyor belt is connected to the outer periphery of the inner conveyor belt. The inner conveyor belt is used to drive the outer conveyor belt to rotate, and the outer conveyor belt is used to transport casting sand from the lower end of the conveying support to the higher end. The conveying support is arranged with a first section, a second section, a third section and a fourth section in sequence along the conveying direction. A magnetic separator, located above the conveyor belt, is used to adsorb ferrous metal impurities from foundry sand. The first section supports the outer conveyor belt, forming two first protrusions on the conveying surface, with a gap between them. Two first lifting rollers are rotatably mounted on the first section of the conveyor support. The two first lifting rollers are arranged along the width direction of the outer conveyor belt, are on the same plane and parallel to each other, and are higher than the inner conveyor belt. A first magnetic roller is arranged between the two first lifting rollers to attract the outer conveyor belt. The first magnetic roller is parallel to the two first lifting rollers and is lower than the inner conveyor belt. A rotating disk is arranged in the first section. The rotating disk rotates intermittently and then resets, and can change its rotation direction. The rotating disk connects the two first lifting rollers and one first magnetic roller. The second section supports the outer conveyor belt and forms two second protrusions on the conveying surface. There is a gap between the two second protrusions, and the two second protrusions can move closer to each other and further away from each other. Two second lifting rollers are provided on the second section of the conveyor support. The two second lifting rollers are arranged along the width direction of the outer conveyor belt. The two second lifting rollers are on the same plane and parallel to each other. The bottom of the two second lifting rollers is higher than the inner conveyor belt. The two second lifting rollers can move closer to each other and further away from each other. A second magnetic roller is provided between the two second lifting rollers. The second magnetic roller is parallel to the second lifting rollers and is lower than the inner conveyor belt. The third section supports the conveying surface of the outer conveyor belt to form a third protrusion, and the top of the third protrusion moves back and forth up and down; two third lifting rollers are provided in the third section of the conveyor support, the two third lifting rollers are arranged along the width direction of the outer conveyor belt, the two third lifting rollers are on the same plane and parallel to each other, and a third magnetic roller is provided between the two third lifting rollers, the third magnetic roller is parallel to the third lifting roller, and the third magnetic roller attracts the top of the third protrusion; The conveyor support is provided with a fourth section, which is located behind the third section. The fourth section supports the conveying surface of the outer conveyor belt to form a fourth protrusion. The degree of protrusion of the fourth protrusion is greater than that of the third protrusion. The top of the fourth protrusion moves up and down repeatedly at intervals and the speed of movement is faster than that of the third protrusion.

2. The lost foam casting sand treatment system according to claim 1, characterized in that, The second section is equipped with two first telescopic cylinders. The fixed ends of the two first telescopic cylinders are connected to the second section of the conveying bracket, and the telescopic ends of the two first telescopic cylinders are respectively connected to two second lifting rollers.

3. The lost foam casting sand treatment system according to claim 1, characterized in that, A second telescopic cylinder is installed in the third section. The second telescopic cylinder is vertically installed and its fixed end is fixedly connected in the third section. The telescopic end of the second telescopic cylinder is connected to the third magnetic suction roller.

4. The lost foam casting sand treatment system according to claim 1, characterized in that, The fourth section is equipped with two fourth lifting rollers, which are arranged along the width of the outer conveyor belt. The two fourth lifting rollers are on the same plane and parallel to each other. A fourth magnetic roller is arranged between the two fourth lifting rollers. The fourth magnetic roller is parallel to the fourth lifting roller and attracts the top of the fourth protrusion.

5. The lost foam casting sand treatment system according to claim 4, characterized in that, A third telescopic cylinder is installed in the fourth section. The third telescopic cylinder is vertically arranged. The fixed end of the third telescopic cylinder is fixedly connected to the fourth section, and the telescopic end of the third telescopic cylinder is connected to the fourth magnetic suction roller.

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