Lost foam casting sand treatment system

Abstract

The invention relates to the technical field of die casting material treatment, in particular to an evanescent mode casting sand treatment system which comprises a conveying support, an inner-layer conveying belt and an outer-layer conveying belt are wound on the conveying support, a first section, a second section and a third section are arranged on the conveying support, when the outer-layer conveying belt passes through the first section, outer-layer casting sand slides off, and when the outer-layer conveying belt passes through the third section, the outer-layer casting sand slides off. The casting sand on the inner layer is conveyed farther due to being closer to the conveying belt, so that exchange turning of the inner layer and the outer layer is achieved, iron metal chippings on the inner layer are exposed to the outer layer, when the casting sand passes through the second section, the casting sand is extruded and rubbed, large casting sand blocks are broken into small blocks, the iron metal chippings wrapped or agglomerated in the casting sand blocks are exposed, and omission is avoided. The casting sand is raised when passing through the third section, the distance between iron metal chippings and a magnetic separator is shortened, the exposure time of the chippings in a magnetic field is prolonged, and the flaky chippings with weak magnetism can be easily captured.

Description

Technical Field

[0001] The invention relates to the technical field of mold casting material processing, in particular to a lost foam casting sand processing system. Background Art

[0002] The lost foam casting sand processing 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 is an important part of the lost foam casting sand processing system. At present, the sand processing part of the production line mostly requires the use of a magnetic separator. The magnetic separator is used to remove ferromagnetic impurities in the casting sand, such as iron filings, iron powder, etc., and use the magnetic field force to adsorb and separate ferromagnetic substances, thereby improving the purity of the casting sand and preventing impurities from affecting the quality of castings.

[0003] For example, Chinese patent CN219943188U discloses a suspended magnetic separator, which 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 group of first partition plates. Then, the motor is started, and the second mounting plate is reciprocated back and forth under the action of the transmission shaft and the cam, so that the second baffle plate and the second partition plate can evenly disperse the foundry sand, thereby facilitating the adsorption of the magnetic separator.

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

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

[0006] The above purpose is achieved through the following technical solutions: A lost foam casting sand processing system, comprising: A conveying bracket, wherein an inner conveyor belt is wound around the conveying bracket, 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 convey casting sand; Magnetic separator, located above the conveyor belt, is used to absorb iron metal impurities in the foundry sand; The first section is located on the conveying support, and the first section supports the conveying surface of the outer conveyor belt to form two first protrusions, with a gap between the two first protrusions; The second section is located behind the first section, and the second section supports the conveying surface of the outer conveyor belt to form two second protrusions, with a gap between the two protrusions, and the two second protrusions approach and move away from each other; The third section is located behind the second section. 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.

[0007] Furthermore, two first lifting rollers are provided on the first section of the conveying bracket, and the two first lifting rollers are arranged along the width direction of the outer conveyor belt. The two first lifting rollers are in 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 adsorb the outer conveyor belt. The first magnetic roller and the two first lifting rollers are parallel to each other, and the first magnetic roller is lower than the inner conveyor belt.

[0008] Furthermore, a rotating disk is provided in the first section. The rotating disk resets after intermittent rotation and can change the rotation direction. The rotating disk is connected to the two first lifting rollers and the first magnetic roller.

[0009] Furthermore, two second lifting rollers are provided on the second section of the conveying bracket, and the two second lifting rollers are arranged along the width direction of the outer conveyor belt. The two second lifting rollers are in the same plane and parallel to each other. The bottoms of the two second lifting rollers are higher than the inner conveyor belt. The two second lifting rollers can approach or move away from each other. A second magnetic roller is provided between the two second lifting rollers. The second magnetic roller and the second lifting roller are parallel to each other, and the second magnetic roller is lower than the inner conveyor belt.

[0010] Furthermore, two first telescopic cylinders are provided 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 the two second lifting rollers.

[0011] Furthermore, two third lifting rollers are provided in the third section of the conveying bracket, and the two third lifting rollers are arranged along the width direction of the outer conveyor belt. The two third lifting rollers are in the same plane and parallel to each other. A third magnetic roller is provided between the two third lifting rollers, and the third magnetic roller and the third lifting roller are parallel to each other. The third magnetic roller adsorbs the top of the third protrusion.

[0012] Furthermore, a second telescopic cylinder is provided in the third section. The second telescopic cylinder is vertically arranged and a fixed end is fixedly connected in the third section. The telescopic end of the second telescopic cylinder is connected to the third magnetic roller.

[0013] Furthermore, a fourth section is provided on the conveying bracket, and the fourth section is located behind the third section. The fourth section supports the conveying surface of the outer conveyor belt to form a fourth protrusion. The protrusion degree of the fourth protrusion is greater than the protrusion degree of the third protrusion. The top of the fourth protrusion moves back and forth up and down within the interval time and the moving speed is faster than the reciprocating up and down movement speed of the third protrusion.

[0014] Furthermore, two fourth lifting rollers are arranged in the fourth section, and the two fourth lifting rollers are arranged along the width direction of the outer conveyor belt. The two fourth lifting rollers are in the same plane and parallel to each other. A fourth magnetic roller is arranged between the two fourth lifting rollers. The fourth magnetic roller and the fourth lifting roller are parallel to each other, and the fourth magnetic roller adsorbs the top of the fourth protrusion.

[0015] Furthermore, a third telescopic cylinder is provided 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 roller.

[0016] The beneficial effects of the present invention are: The present invention arranges a first section, a second section and a third section on the conveying bracket. The two first protrusions of the first section make the outer layer of casting sand slide down when the casting sand on the conveying surface of the outer conveyor belt passes by, and the inner layer of casting sand is conveyed farther because it is closer to the conveyor belt, thereby realizing the exchange and flipping of the inner and outer layers, allowing the inner layer of iron metal debris to be exposed to the outer layer, which is convenient for the magnetic separator to adsorb; the gap between the two second protrusions of the second section can be changed. When the casting sand passes by, it will be squeezed and kneaded, and the large pieces of casting sand will be broken into small pieces, so that the iron metal debris wrapped or agglomerated therein will be exposed to avoid omission; the top of the third protrusion of the third section moves back and forth up and down to lift the casting sand, shortening the distance between the iron metal debris and the magnetic separator, increasing the exposure time of the debris in the magnetic field, and making it easy to capture flaky debris with weaker magnetism.

[0017] The present invention arranges a rotating disk in the first section of the conveying bracket, and the rotating disk connects the two first lifting rollers and the first magnetic roller. The rotating disk drives the two first lifting rollers and the first magnetic roller to rotate intermittently and then reset and rotate in the opposite direction, so that the first protrusion formed in the first section has an inclined surface, thereby changing the distribution of the casting sand on the outer conveyor belt, so that the casting sand can swing left and right on the outer conveyor belt, further improving the adsorption effect of the magnetic separator on ferrous metal impurities.

[0018] The present invention provides a fourth section on the conveying bracket. The fourth protrusion of the fourth section is more protruding than the third protrusion, the top is closer to the magnetic separator, and the top moves back and forth faster, so that the outer conveyor belt vibrates, allowing the fine powder, fine chips, particles and other iron metal debris adsorbed on its surface to instantly detach and be adsorbed by the magnetic separator, thereby further improving the removal rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a lost foam casting sand processing system provided in one embodiment of the present invention; Figure 2 for Figure 1 A cross-sectional view of a lost foam casting sand processing system provided in one embodiment; Figure 3 for Figure 2 A partial enlarged view of part A of the lost foam casting sand processing system provided in one embodiment; Figure 4 for Figure 2 A partial enlarged view of part B of the lost foam casting sand processing system provided in one embodiment; Figure 5 for Figure 2 A partial enlarged view of part C of the lost foam casting sand processing system provided in one embodiment; Figure 6 for Figure 2 A partial enlarged view of part D of the lost foam casting sand processing system provided in one embodiment; Figure 7 A schematic structural diagram of a section of an outer conveyor belt of a lost foam casting sand processing system provided in one embodiment of the present invention; Figure 8 A schematic structural diagram of a section of an outer conveyor belt of a lost foam casting sand processing system provided by one embodiment of the present invention from another angle; Figure 9 A schematic structural diagram of a conveying support for a lost foam casting sand processing system according to an embodiment of the present invention; Figure 10 This is an axonometric view of a cutaway conveying support of a lost foam casting sand processing system provided in one embodiment of the present invention.

[0020] in: 100, conveying bracket; 110, conveying roller; 120, driving motor; 130, inner conveyor belt; 140, outer conveyor belt; 150, flexible metal strip; 160, partition; 200, first section; 210, first protrusion; 220, first lifting roller; 230, first magnetic roller; 240, first obstacle avoidance telescopic cylinder; 250, rotating disk; 260, rotating motor; 300, second section; 310, second protrusion; 320, second lifting roller; 330, second magnetic roller; 340, first telescopic cylinder; 350, sliding frame; 360, second obstacle avoidance telescopic cylinder; 400, third section; 410, third protrusion; 420, third lifting roller; 430, third magnetic roller; 440, second telescopic cylinder; 450, third obstacle avoidance telescopic cylinder; 500, fourth section; 510, fourth protrusion; 520, fourth lifting roller; 530, fourth magnetic roller; 540, third telescopic cylinder; 550, fourth obstacle avoidance telescopic cylinder; 600. Magnetic separator. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is 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 only used to explain the present invention and are not intended to limit the present invention.

[0022] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or component being referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0023] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0024] Refer to the following Figures 1-10 A lost foam casting sand processing system provided by the present invention is described.

[0025] A lost foam casting sand processing system is suitable for removing ferrous metal debris in casting sand, including a conveying bracket 100. The upper end surface of the conveying bracket 100 is inclined, and an inner conveyor belt 130 is wound around the conveying bracket 100. Conveying rollers 110 are respectively provided at both ends of the conveying bracket 100. The bracket is also provided with a driving motor 120. The driving motor 120 is used to drive one of the conveying rollers 110 to rotate. The conveying roller 110 drives the inner conveyor belt 130 to rotate. The outer periphery of the inner conveyor belt 130 is connected to the outer conveyor belt 140. The inner conveyor belt 130 is used to drive the outer conveyor belt 140 to rotate. The conveying surface of the outer conveyor belt 140 is used to convey casting sand, and the casting sand is conveyed from the lower end of the conveying bracket 100 to the higher end. A magnetic separator 600 is provided on the conveying support 100 (the magnetic separator 600 is a prior art and will not be described in detail here). 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 absorb the iron metal debris in the foundry sand, so that the iron metal debris is separated from the foundry sand. However, the magnetic separator 600 in the prior art is not very effective in absorbing the iron metal debris, resulting in the foundry sand being stuck. The removal rate of ferrous metal debris in sand making is low. Since the ferrous metal debris in the foundry sand has different sources, different shapes, and different particle sizes, some ferrous metal debris is difficult to be adsorbed during magnetic separation. Some ferrous metal debris or particles that form agglomerates or inclusions with the foundry sand are difficult to be adsorbed by the magnetic separator 600 above. Some flaky ferrous metal debris 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 debris in the foundry sand is low.

[0026] Based on this, the present invention is provided with multiple sections on the conveying bracket 100. When the outer conveyor belt 140 passes through each section, it forms a different shape, so that the different iron metal fragments in the foundry sand on the outer conveyor belt 140 are sequentially adsorbed by the magnetic separator 600, thereby improving the removal rate of the iron metal fragments in the foundry sand.

[0027] A first section 200 is provided on the conveying support 100. When the outer conveyor belt 140 passes through the first section 200, the conveying surface will be 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 outer layer of foundry sand on the outer conveyor belt 140 will slide down on the slope formed by the upper and lower first protrusions 210, so that the moving speeds of the inner layer foundry sand and the outer layer foundry sand are different. The inner layer foundry sand is closer to the outer conveyor belt 140, so the inner layer foundry sand can be transported a higher distance by the outer conveyor belt 140, thereby separating the inner and outer layers of foundry sand, thereby achieving the effect of exchanging and flipping the inner and outer layers of foundry sand, so that the iron metal debris in the inner layer of foundry sand is flipped to the outer layer, which is convenient for adsorption by the magnetic separator 600.

[0028] It can be understood that the two first protrusions 210 of the first section 200 create a speed difference between the inner and outer layers of the foundry sand, thereby realizing automatic flipping of the foundry sand. The inner layer of the foundry sand is transported farther because it is closer to the outer conveyor belt 140, and the outer layer of the foundry sand flips due to sliding, exposing the iron debris originally buried inside the foundry sand to the surface. This process can be completed without additional power, which solves the limitation of traditional magnetic separation that can only absorb surface iron metal debris.

[0029] The transport support 100 is provided with a second section 300, which is located behind the first section 200 (with Figure 2 As shown, the conveying direction of the foundry sand is from left to right, and the rear refers to the front side of the conveying direction, that is, the second section 300 is located on the right side 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, so that large pieces of foundry sand can be squeezed and broken into small pieces of foundry sand, so that the iron metal debris formed in the agglomerates or inclusions of the foundry sand can be exposed, and then the magnetic separator 600 can absorb these exposed iron metal debris to avoid omission.

[0030] It can be understood that the second section 300 squeezes and kneads the foundry sand through the double-protrusion structure with adjustable gap, so that the iron debris (such as iron beans and iron slag) that was originally wrapped or agglomerated by the foundry sand is forcibly separated. This mechanical crushing action directly destroys the bonding force between the debris and the foundry sand, avoiding the omission problem caused by traditional magnetic separation due to its inability to penetrate the foundry sand layer. It is particularly suitable for adhesive impurities mixed in during the cleaning process of castings.

[0031] A third section 400 is provided on the conveying support 100, and the third section 400 is located behind the second section 300. When the outer conveyor belt 140 passes through the third section 400, a third protrusion 410 will be supported on the conveying surface of the outer conveyor belt 140. 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, thereby making 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.

[0032] It can be understood that the reciprocating protrusions of the third section 400 shorten the distance between the iron debris and the magnetic separator 600 by lifting the casting sand, and at the same time increase the exposure time of the debris in the magnetic field. For flaky debris with weaker magnetism, this dynamic lifting effect makes it easier to be captured by the magnetic separator 600, breaking through the limitations of traditional static adsorption on the debris morphology.

[0033] By providing a plurality of sections on the conveying support 100 , the separation effect of the ferrous metal debris in the foundry sand is significantly improved, and the removal rate of the ferrous metal debris in the foundry sand is increased.

[0034] Specifically, such as Figure 2 、 Figure 3 、 Figure 9 and Figure 10 As shown, in order to support the outer conveyor belt 140 to form two first protrusions 210 when passing through the first section 200, two first lifting rollers 220 are rotatably arranged in the first section 200 of this embodiment. The two first lifting rollers 220 are arranged along the width direction of the outer conveyor belt 140. The two first lifting rollers 220 are in the same plane and parallel to each other. The two first lifting rollers 220 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 the inner conveyor belt 130. The first magnetic roller 230 can absorb the outer conveyor belt 140, so that The inner periphery of the outer conveyor belt 140 is always in contact with the part 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 form two first protrusions 210. At the same time, the first magnetic roller 230 located between the two first lifting rollers 220 absorbs the outer conveyor belt 140 between the two first lifting rollers 220, so that there is a gap between the two first protrusions 210 supported by the two first lifting rollers 220. When the foundry sand passes through the gap, the inner and outer layers can also be flipped, so that the iron metal impurities in the foundry sand can be better absorbed by the magnetic separator 600.

[0035] It should be noted that the structure for supporting the outer conveyor belt 140 with the two first protrusions 210 is not limited to the above structure, and other structures may be used. For example, the first section 200 of the conveyor support 100 may be configured to have the 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 are not specifically limited here.

[0036] In a further embodiment, Figure 3 、 Figure 9 and Figure 10 As shown, in order to achieve a better tumbling effect of the foundry sand passing through the first section 200, the present invention simultaneously arranges the two first lifting rollers 220 and the first magnetic roller 230 inside the first section 200 on a rotating disk 250. The rotating disk 250 is rotatably arranged in the first section 200. A rotating motor 260 is provided in 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 first magnetic roller 230 to rotate synchronously, so that the two first lifting rollers 220 and the first magnetic roller 230 no longer extend along the width direction of the outer conveyor belt 140, but 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 and is supported to form an inclined conveying surface, the casting sand on the outer conveyor belt 140 will be offset, specifically, the casting sand will be offset on 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, the rotating disk 250 will rotate a certain angle at regular intervals, so that the casting sand on the outer conveyor belt 140 will be offset. After a period of time, the rotating disk 250 will reset, so that the casting sand on the outer conveyor belt 140 will also be reset. After another period of time, the rotating disk 250 will rotate in the opposite direction, so that the casting sand on the outer conveyor belt 140 is offset in the opposite direction. After another period of time, the rotating disk 250 will reset again, and this cycle will continue.

[0037] Specifically, such as Figure 2 、 Figure 4 、 Figure 9 and Figure 10As shown, in order to enable the outer conveyor belt 140 to form two second protrusions 310 when passing through the second section 300, and the two second protrusions 310 can approach and move 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. The two second lifting rollers 320 are in the same plane and parallel to each other. The two second lifting rollers 320 are higher than the inner conveyor belt 130. A second magnetic roller 330 is provided between the two second lifting rollers 320. The second magnetic roller 330 is parallel to the two second lifting rollers 320. The second magnetic roller 330 is lower than On the inner conveyor belt 130, the distance between the two second lifting rollers 320 can be changed, and the second magnetic roller 330 between the two second lifting rollers 320 can also absorb the outer conveyor belt 140, so that the outer conveyor belt 140 can be completely fitted on 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 the two will be reduced. At the same time, the foundry sand inside the gap will be squeezed and kneaded, so that the large pieces of foundry sand in the foundry sand are squeezed and kneaded into small pieces of foundry sand, and the two second lifting rollers 320 are constantly approaching and moving away from each other, thereby continuously squeezing and kneading the foundry sand that passes subsequently.

[0038] Specifically, such as Figure 2 、 Figure 4 、 Figure 9 and Figure 10 As shown, in order to realize the function that the two second lifting rollers 320 can approach and move away from each other, two first telescopic cylinders 340 are provided in the second section 300, and the fixed ends of the two first telescopic cylinders 340 are provided in the second section 300. 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 approach and move away from each other, and the two first telescopic cylinders 340 extend or shorten at the same time. The two first telescopic cylinders 340 drive the two second lifting rollers 320 to continuously approach and move away from each other, thereby realizing the function that the foundry sand can be squeezed and kneaded when passing through the second section 300.

[0039] More specifically, 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 ends of the two first telescopic cylinders 340, and each sliding frame 350 is provided with two connecting rods, and a rotating ring is provided at the end of the connecting rod, which is rotatably connected to the two ends of the first lifting roller 220.

[0040] It should be noted that the structure in which the outer conveyor belt 140 is supported as two second protrusions 310 when passing through the second section 300, and the two second protrusions 310 can move toward and away from each other, is not limited to the above-described structure. Other structures are also possible. For example, two protrusions that can move toward and away from each other 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 abuts against the two protrusions. The two protrusions move toward and away from each other, thereby squeezing and kneading the foundry sand. Of course, other structures are also possible and are not specifically limited here.

[0041] 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, and the two third lifting rollers 420 are arranged along the width direction of the outer conveyor belt 140. The two third lifting rollers 420 are in 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 and the two third lifting rollers 420 are parallel to each other. The two third lifting rollers 420 are higher than the inner conveyor belt 130. 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 a third magnetic roller 430 that absorbs the top of the third protrusion 410, and the third magnetic roller 430 can move in the vertical direction, so that the top of the third protrusion 410 can be reciprocatedly raised and lowered. At the same time, the third magnetic roller 430 moves in the vertical direction at a faster speed so that the outer conveyor belt 140 at the top of the third protrusion 410 can lift the passing foundry sand. At this time, the foundry sand is closer to the magnetic separator 600, and the adsorption force of the magnetic separator 600 on the ferrous metal impurities in the foundry sand is increased, thereby improving the adsorption effect of the magnetic separator 600 on the ferrous metal impurities, thereby increasing the removal rate of the ferrous metal impurities in the foundry sand.

[0042] More specifically, Figure 2 、 Figure 5 and Figure 9As shown, in order to enable the third magnetic roller 430 to move in the vertical direction, a second telescopic cylinder 440 is provided in the third section 400. The second telescopic cylinder 440 is vertically arranged, and the fixed end of the second telescopic cylinder 440 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 absorb the outer conveyor belt 140. When the third magnetic roller 430 moves up and down quickly, it drives 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.

[0043] 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, and a rotating ring is provided on the telescopic end of the two second telescopic cylinders 440. The rotating ring is rotatably connected to the two ends of the third magnetic roller 430, thereby driving the third magnetic roller 430 to move up and down without affecting the rotation of the third magnetic roller 430.

[0044] It should be noted that the structure in which the outer conveyor belt 140 forms the third protrusion 410 when passing through the third section 400, and the top of the third protrusion 410 is movable up and down, is not limited to the above-described structure. Other structures are also possible. For example, a vertically movable protrusion may be provided on the third section 400 of the conveyor support 100. The protrusion has the same shape as the third protrusion 410. When the outer conveyor belt 140 passes through the protrusion, it is supported to form the third protrusion 410. The protrusion can also move up and down, thereby raising the foundry sand. Of course, other structures are also possible and are not specifically limited here.

[0045] In a further embodiment, after passing through the above three sections, most of the iron metal debris in the foundry sand has been adsorbed by the magnetic separator 600, but there will still be some fine powder, fine debris, particles, etc. that 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 sets a fourth section 500 on the conveying bracket 100 to target these fine powder, fine debris, particles, etc. that are easily adsorbed on the surface of the conveyor belt.

[0046] 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 protrusion of the fourth protrusion 510 is greater than that of the third protrusion 410, and the height of the fourth protrusion 510 is higher. The top of the fourth protrusion 510 is closer to the magnetic separator 600. Since the protrusion of the fourth protrusion 510 is greater, when the casting sand passes through the fourth protrusion 510, the large particles of casting sand on the outer conveyor belt 140 will slide on the fourth protrusion 510. Only some fine powder, fine chips, particles and other iron metal debris attached to the outer conveyor belt 140 that are easily adsorbed on the surface of the outer conveyor belt 140 can pass through the fourth protrusion 510. During this time, the conveyor belt 140 will pass through the highest position of the fourth protrusion 510, and the magnetic separator 600 will absorb some of the ferrous 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, thereby instantly separating some fine powder, fine debris, particles, etc. attached to the outer conveyor belt 140, which are easily adsorbed on the surface of the outer conveyor belt 140, from the surface of the outer conveyor belt 140, so that the magnetic separator 600 can absorb these instantly separated ferrous metal debris, thereby removing some fine powder, fine debris, particles, etc. in the foundry sand, which are easily adsorbed on the surface of the outer conveyor belt 140, and further improving the removal rate of ferrous metal impurities in the foundry sand.

[0047] Specifically, such as Figure 2 、 Figure 6 、 Figure 9 and Figure 10 As shown, two fourth lifting rollers 520 are provided inside the fourth section 500 of the present invention, and 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 in 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 provided between the two fourth lifting rollers 520. The height of the fourth magnetic roller 530 is higher than the two fourth lifting rollers 520, and the distance between the two fourth lifting rollers 520 is close. The fourth magnetic roller 530 absorbs the outer conveyor belt 140 so that the outer conveyor belt 140 can be supported by the two fourth lifting rollers 520 and a fourth magnetic roller 530, thereby supporting the formation of the fourth protrusion 510. The fourth magnetic roller 530 absorbs 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.

[0048] More specifically, Figure 2 、 Figure 5 、 Figure 6 and Figure 9As shown, in order to enable the fourth magnetic roller 530 to move up and down quickly in the vertical direction, a third telescopic cylinder 540 is provided in the fourth section 500. The speed of extension and contraction of the third telescopic cylinder 540 is faster than that of the second telescopic cylinder 440. The fixed end of the third telescopic cylinder 540 is provided in the fourth section 500. 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 quickly extends and shortens, thereby driving the fourth magnetic roller 530 to move synchronously.

[0049] 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, and a rotating ring is provided on the telescopic end of the two third telescopic cylinders 540. The rotating ring is rotatably connected to the two 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.

[0050] It should be noted that the structure for causing the outer conveyor belt 140 to form the fourth protrusion 510 and for the fourth protrusion 510 to move rapidly up and down when passing through the fourth section 500 is not limited to the above-described structure, and other structures may also be employed. For example, a rapidly movable protrusion may be provided on the fourth section 500 of the conveyor support 100, the shape of the protrusion being the same as that of the fourth protrusion 510. When the outer conveyor belt 140 passes through the fourth section 500, the protrusion may be supported by the protrusion to form the fourth protrusion 510. The protrusion may then move rapidly up and down, thereby causing the outer conveyor belt 140 in the fourth section 500 to vibrate. Of course, other structures are also possible and are not specifically limited herein.

[0051] In order to make the inner conveyor belt 130 and the outer conveyor belt 140 adapt to the above-mentioned first section 200, second section 300, third section 400 and fourth section 500, the inner conveyor belt 130 and the outer conveyor belt 140 are connected by a partition 160 in the present invention. The inner conveyor belt 130 is not a complete conveyor belt, but is composed of two sections of conveyor belts. The two sections of conveyor belts are respectively wound on the two ends of the conveyor roller 110. There is a space between the two sections of conveyor belts, and the 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 5 30. Multiple partitions 160 are arranged at intervals on the two sections of the conveyor belt. The multiple partitions 160 are parallel to the conveying roller 110. The intervals between the multiple partitions 160 are the same. The outer conveyor belt 140 is 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 the lengths of all the outer conveyor belts 140 are equal. The outer conveyor belt 140 can adapt to the lifting rollers and magnetic rollers inside each section, so that the outer conveyor belt 140 can contact the outer periphery of the lifting rollers and magnetic rollers in each section, thereby allowing the outer conveyor belt 140 to form a special shape to cope with different iron metal impurities in the casting sand.

[0052] It should be noted that in order to prevent the outer conveyor belt 140 and the inner conveyor belt 130 from colliding with the lifting rollers and magnetic rollers inside each section when the partition 160 is close to the lifting rollers and magnetic rollers in each section, the lifting rollers and magnetic rollers in each section will move downward, thereby preventing the partition 160 from colliding with the lifting rollers and magnetic rollers inside each section, and when the partition 160 passes over the lifting rollers and magnetic rollers in each section, the lifting rollers and magnetic rollers inside each section move upward again and reset, and the lifting rollers and magnetic rollers support the outer conveyor belt 140 again.

[0053] In order to realize the up and down movement of the lifting rollers and magnetic suction rollers in the above-mentioned sections, four first obstacle-avoiding telescopic cylinders 240 are arranged in the first section 200, and the four first obstacle-avoiding telescopic cylinders 240 are connected to the two first lifting rollers 220. The connection method of the four first obstacle-avoiding telescopic cylinders 240 and the first lifting rollers 220 is the same as the connection method of the first telescopic cylinder 340 and the second lifting roller 320; similarly, a second obstacle-avoiding telescopic cylinder 360 is arranged in the second section 300, a third obstacle-avoiding telescopic cylinder 450 is arranged in the third section 400, and a fourth obstacle-avoiding telescopic cylinder 550 is arranged in the fourth section 500.

[0054] It should be noted that if Figure 8As shown, a flexible metal strip 150 is provided in the middle position of the outer conveyor belt 140 of the present invention. The flexible metal strip 150 can be adsorbed by multiple magnetic rollers, so that the outer conveyor belt 140 is in a tensioned state. Since the magnetic rollers are arranged between the two lifting rollers, when the magnetic rollers adsorb the outer conveyor belt 140, the outer conveyor belt 140 can be fitted with the lifting rollers on both sides, thereby maintaining the outer conveyor belt 140 supported in the special shape of the first protrusion 210, the second protrusion 310, the third protrusion 410 and the fourth protrusion 510.

[0055] The specific working process of the lost foam casting sand processing system provided by the present invention is described in combination with the above embodiments: The driving motor 120 on the conveying bracket 100 is started, and the magnetic separator 600 is started at the same time. The driving motor 120 drives the conveying roller 110 to rotate, and the conveying roller 110 drives the inner conveyor belt 130 to rotate. The inner conveyor belt 130 drives the outer conveyor belt 140 to rotate synchronously. The casting sand falls on the outer conveyor belt 140 and is transported by the outer conveyor belt 140. When the outer conveyor belt 140 passes through the first section 200 of the conveying bracket 100, the two first lifting rollers 220 and the first magnetic roller in the first section 200 230 will drop when the partition 160 approaches, and rise when the partition 160 moves away, thereby 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 absorbs the outer conveyor belt 140 so that the two first lifting rollers 220 support the outer conveyor belt 140 at the same time, thereby forming two first protrusions 210, with a gap between the two first protrusions 210, as shown in FIG. Figure 3 As shown, the foundry sand on the outer conveyor belt 140 will roll over when passing through the two first protrusions 210, that is, the foundry sand on the outer layer will slide downward when encountering the first protrusions 210, while the foundry sand on the inner layer will move upward, so that the foundry sand on the inner and outer layers will exchange positions, and the iron metal debris in the inner layer of the foundry sand can be adsorbed by the magnetic separator 600.

[0056] When the outer conveyor belt 140 moves to the second section 300, the two second lifting rollers 320 and the second magnetic roller 330 in the second section 300 descend when the partition 160 approaches, and rise when the partition 160 moves away. When the two second lifting rollers 320 and the second magnetic roller 330 rise, the height of the two second lifting rollers 320 is higher than the height of the second magnetic roller 330. The two first telescopic cylinders 340 in the second section 300 reciprocate to drive the two second lifting rollers 320 to approach and move away from each other. Since the second magnetic roller 330 is located between the two second lifting rollers 320, the second magnetic roller 330 absorbs the outer conveyor belt 140 so that the two second lifting rollers 320 support the outer conveyor belt 140 to form two second protrusions 310. Figure 4 As shown, when the two second lifting rollers 320 move back and forth, they can squeeze and knead the foundry sand that enters between the two second protrusions 310, so that the larger foundry sand is squeezed and kneaded into smaller foundry sand, thereby exposing the iron metal impurities contained in the larger foundry sand, which is convenient for adsorption by the magnetic separator 600.

[0057] When the outer conveyor belt 140 moves to the third section 400, the two third lifting rollers 420 and the third magnetic roller 430 in the third section 400 descend when the partition 160 approaches, and rise when the partition 160 moves away. When the two third lifting rollers 420 and the third magnetic roller 430 rise, the height of the third magnetic roller 430 rises higher than the two third lifting rollers 420, so that the outer conveyor belt 140 is supported as a third protrusion 410. Figure 5 As shown, the third magnetic roller 430 will reciprocate in the vertical direction, enabling the outer conveyor belt 140 to lift the foundry sand. When the foundry sand is lifted, it can be closer to the magnetic separator 600, and the magnetic separator 600 can better absorb the iron metal impurities in the foundry sand.

[0058] When the outer conveyor belt 140 is transported to the fourth section 500, the two fourth lifting rollers 520 and the fourth magnetic roller 530 in the fourth section 500 are lowered when the partition 160 approaches, and are raised when the partition 160 moves away. When the two fourth lifting rollers 520 and the fourth magnetic roller 530 are raised, the height of the fourth magnetic roller 530 is higher than the two fourth lifting rollers 520, so that the outer conveyor belt 140 is supported as the fourth protrusion 510. Figure 6 As shown, the degree of protrusion of the fourth protrusion 510 is greater than that of the third protrusion 410, and the fourth magnetic roller 530 reciprocates in the vertical direction at a faster speed, so that the outer conveyor belt 140 vibrates in the fourth section 500, so that the iron metal impurities in the foundry sand that are easily adsorbed on the outer conveyor belt 140 are instantly separated from the outer conveyor belt 140, and the iron metal impurities in the foundry sand can be completely adsorbed, thereby improving the removal rate of iron metal debris in the foundry sand.

[0059] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, 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.

[0060] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A lost foam casting sand processing system, characterized in that: include: A conveying bracket, wherein an inner conveyor belt is wound around the conveying bracket, 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 convey casting sand; Magnetic separator, located above the conveyor belt, is used to absorb iron metal impurities in the foundry sand; The first section is located on the conveying support, and the first section supports the conveying surface of the outer conveyor belt to form two first protrusions, with a gap between the two first protrusions; The second section is located behind the first section, and the second section supports the conveying surface of the outer conveyor belt to form two second protrusions, with a gap between the two protrusions, and the two second protrusions approach and move away from each other; The third section is located behind the second section. 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.

2. The lost foam casting sand processing system according to claim 1, characterized in that: Two first lifting rollers are rotatably provided on the first section of the conveying bracket. The two first lifting rollers are arranged along the width direction of the outer conveyor belt. The two first lifting rollers are in 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 adsorb the outer conveyor belt. The first magnetic roller and the two first lifting rollers are parallel to each other, and the first magnetic roller is lower than the inner conveyor belt.

3. The lost foam casting sand processing system according to claim 2, characterized in that: A rotating disk is provided in the first section. The rotating disk is reset after intermittent rotation and can change the rotation direction. The rotating disk is connected to two first lifting rollers and a first magnetic roller.

4. The lost foam casting sand processing system according to claim 1, characterized in that: Two second lifting rollers are provided on the second section of the conveying bracket. The two second lifting rollers are arranged along the width direction of the outer conveyor belt. The two second lifting rollers are in the same plane and parallel to each other. The bottoms of the two second lifting rollers are higher than the inner conveyor belt. The two second lifting rollers can approach or move away from each other. A second magnetic roller is provided between the two second lifting rollers. The second magnetic roller and the second lifting roller are parallel to each other, and the second magnetic roller is lower than the inner conveyor belt.

5. The lost foam casting sand processing system according to claim 4, characterized in that: Two first telescopic cylinders are arranged 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 the two second lifting rollers.

6. The lost foam casting sand processing system according to claim 1, characterized in that: Two third lifting rollers are arranged in the third section of the conveying bracket. The two third lifting rollers are arranged along the width direction of the outer conveyor belt. The two third lifting rollers are in the same plane and parallel to each other. A third magnetic roller is arranged between the two third lifting rollers. The third magnetic roller and the third lifting roller are parallel to each other. The third magnetic roller adsorbs the top of the third protrusion.

7. The lost foam casting sand processing system according to claim 6, characterized in that: A second telescopic cylinder is provided in the third section. The second telescopic cylinder is vertically arranged and a fixed end is fixedly connected in the third section. The telescopic end of the second telescopic cylinder is connected to the third magnetic roller.

8. The lost foam casting sand processing system according to claim 1, characterized in that: A fourth section is provided on the conveying bracket, and the fourth section is located behind the third section. The fourth section supports the conveying surface of the outer conveyor belt to form a fourth protrusion. The protrusion degree of the fourth protrusion is greater than that of the third protrusion. The top of the fourth protrusion moves back and forth up and down within the interval time and the moving speed is faster than the reciprocating up and down movement speed of the third protrusion.

9. The lost foam casting sand processing system according to claim 8, characterized in that: Two fourth lifting rollers are arranged in the fourth section, and the two fourth lifting rollers are arranged along the width direction of the outer conveyor belt. The two fourth lifting rollers are in the same plane and parallel to each other. A fourth magnetic roller is arranged between the two fourth lifting rollers. The fourth magnetic roller and the fourth lifting roller are parallel to each other, and the fourth magnetic roller adsorbs the top of the fourth protrusion.

10. The lost foam casting sand processing system according to claim 9, characterized in that: A third telescopic cylinder is provided 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. The telescopic end of the third telescopic cylinder is connected to the fourth magnetic roller.

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