Magnetic separation and washing equipment and magnetic separation and washing method for used foundry sand

Abstract

The present invention provides a magnetic separation and washing device and a magnetic separation and washing method for used foundry sand, and relates to the technical field of casting material processing equipment. The purpose is to solve the technical problem of low efficiency in magnetic separation and washing of used foundry sand in the prior art. The adopted technical scheme is: the magnetic separation and washing device for used foundry sand comprises: a magnetic separation and washing device; the magnetic separation and washing device comprises: a conveying trough, a spiral blade arranged in the conveying trough; an electromagnet is installed in the hollow shaft of the spiral blade; one end of the conveying trough constitutes a feed end and is provided with a third overflow port; the other end of the conveying trough constitutes a discharge end and is provided with a discharge port; the conveying trough is inclined upward from the feed end to the discharge end, so that the top of the discharge port is higher than the liquid level in the conveying trough. The present invention can magnetically separate and wash used foundry sand at the same time, improve the processing efficiency, and reduce the occupied workshop area. In addition, the present invention also provides a magnetic separation and washing method for used foundry sand, which adopts the above-mentioned magnetic separation and washing device.

Description

Technical Field

[0001] The invention relates to the technical field of casting material processing equipment, and in particular to magnetic separation and washing equipment and a magnetic separation and washing method for used casting sand. Background Art

[0002] Sand casting refers to a casting method that produces castings in sand molds. Steel, iron and most non-ferrous alloy castings can be obtained through sand casting. The basic raw materials for making sand molds are foundry sand and sand binder. Used foundry sand is called used foundry sand. Based on the considerations of protecting the environment and reducing costs, it is necessary to regenerate the used foundry sand for recycling.

[0003] The recycling of used foundry sand basically requires magnetic separation and washing. However, most of the existing foundry sand recycling equipment has a single function; it is often necessary to use different equipment to magnetically separate and wash the foundry sand. This treatment method is relatively inefficient and requires the turnover of materials in the workshop, which will occupy a large workshop area. Therefore, it is necessary to improve the existing technology to address the above problems. Summary of the invention

[0004] An object of the present invention is to provide a magnetic separation and washing device for used foundry sand, which can simultaneously perform magnetic separation and washing on used foundry sand, thereby improving processing efficiency and reducing occupied workshop area; based on the same inventive concept, another object of the present invention is to provide a magnetic separation and washing method for used foundry sand, which adopts the aforementioned magnetic separation and washing device.

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

[0006] A magnetic separation and washing device for used foundry sand comprises: a magnetic separation and washing device; the magnetic separation and washing device comprises: a conveying trough extending in the left-right direction, a spiral blade arranged in the conveying trough, and a first power source for driving the spiral blade to rotate; the spiral blade has a hollow shaft, and an electromagnet is installed in the hollow shaft; one end of the conveying trough constitutes a feed end, and is provided with a third overflow port; the other end of the conveying trough constitutes a discharge end, and is provided with a discharge port; the conveying trough is inclined upward from the feed end to the discharge end, so that the top of the discharge port is higher than the liquid level in the conveying trough; a spray head is provided above the conveying trough; the spray head sprays water toward one end of the liquid surface close to the discharge port, so as to drive the scum floating on the liquid surface to the feed end.

[0007] Optionally, the two ends of the hollow shaft are rotatably connected to the ends of the conveying trough through sealed bearings respectively; one end of the hollow shaft is closed and connected to the first power source, and the other end has a port for taking out the discharge magnet; the outer end of the electromagnet has a connecting ring surrounding the outer circumference, and the outer end of the connecting ring is fixedly connected to the outer end of the electromagnet; the inner diameter of the connecting ring is larger than the outer diameter of the electromagnet, so as to form an annular groove between the two for inserting the port of the hollow shaft; the connecting ring has a radial through hole, and the outer peripheral wall of the hollow shaft is correspondingly provided with threaded holes, and is adapted to connect bolts; a shield for shielding the outer end of the electromagnet is installed at the end of the conveying trough, a slip ring is installed in the shield, and a brush matching the slip ring is installed at the outer end of the electromagnet.

[0008] Optionally, the magnetic separation washing device also includes: a water trough located below the conveying trough; the water trough is divided into multiple water filtering areas along the left and right directions, and each water filtering area is respectively provided with a water filtering mechanism; the water filtering area located at one end of the water trough corresponds to the third overflow port, constituting a water receiving area; the water filtering area located at the other end of the water trough constitutes a water pumping area; the spray head is connected to the water pumping area through a water pumping pipe, and is adapted to a water pump.

[0009] Optionally, the water filtering mechanism includes: a square cylinder, a sieve plate that divides the square cylinder into an upper layer and a lower layer, and filter material laid on the upper layer; wherein the water filtering mechanism is divided into a first water filtering mechanism and a second water filtering mechanism; the square cylinder of the first water filtering mechanism constitutes a first filter cylinder, and the first filter cylinder is provided with a first overflow port on the left side of the upper layer and a first water outlet on the right side of the lower layer; the square cylinder of the second water filtering mechanism constitutes a second filter cylinder, and the second filter cylinder is provided with a second water outlet on the left side of the lower layer and a second overflow port on the right side of the upper layer; the first water filtering mechanism and the second water filtering mechanism are alternately distributed in the water tank; adjacent first water outlets are correspondingly connected to the second water outlets, and adjacent first overflow ports are correspondingly connected to the second overflow ports.

[0010] Optionally, the magnetic separation washing device also includes: a material guide trough extending in the left-right direction; the material guide trough is adapted to be driven by a second power source to move left-right so as to leave or intercept below the discharge port; the material guide trough is open at one end close to the pumping area and closed at the other end away from the pumping area; when the material guide trough is intercepted below the discharge port, the iron-containing waste sand discharged from the discharge port slides along the material guide trough into the upper layer of the square cylinder in the pumping area.

[0011] Optionally, the square tube is provided with first rollers at the top of the front and rear sides respectively; the front and rear inner walls of the water tank are provided with step grooves extending in the left and right directions respectively for the first rollers to move.

[0012] Optionally, multiple magnetic separation washing devices are arranged in the up and down directions, and are divided into a first magnetic separation washing device and a second magnetic separation washing device; the first magnetic separation washing device and the second magnetic separation washing device are alternately distributed in the up and down directions; the discharge port of the first magnetic separation washing device corresponds to the receiving end of the second magnetic separation washing device up and down, and the receiving end of the first magnetic separation washing device corresponds to the discharge port of the second magnetic separation washing device up and down.

[0013] Optionally, for any two adjacent magnetic separation and washing devices, the magnetic separation and washing device located at the bottom is provided with multiple guide rails with slide grooves along the left-right direction on the top of the conveying trough, and the magnetic separation and washing device located at the top is provided with a corresponding second roller at the bottom of the trough; the guide rails extend along the front-to-back direction, and a chamfer is provided on the upper edge of the slide groove; the guide rails are respectively provided with downwardly extending positioning holes at the front and rear ends of the slide groove for inserting positioning members that limit the second roller.

[0014] The present application also provides a magnetic separation and washing method for used foundry sand, which uses the aforementioned magnetic separation and washing equipment and includes the following steps:

[0015] S1: The electromagnet is energized, and the second power source is driven to drive the guide trough away from the bottom of the discharge port; the used foundry sand is fed into the feed end of the conveying trough, and the first power source is driven to rotate the spiral blade; the spiral blade stirs and turns the used foundry sand while pushing the used foundry sand toward the discharge end; thereby, the iron-containing waste sand is adsorbed on the surface of the hollow shaft and the spiral blade, and the used foundry sand that has been washed and magnetically separated is discharged from the discharge port;

[0016] S2: Stop feeding the old foundry sand into the feeding end of the conveying trough; when no more old foundry sand is discharged from the discharge port, the second power source drives the guide trough to intercept below the discharge port; then the electromagnet is powered off, so that the iron-containing waste sand falls and is pushed to the discharge port by the spiral blades; thus, the iron-containing waste sand slides along the guide trough into the upper layer of the square cylinder in the pumping area and becomes filter material;

[0017] S3: alternately executing step S1 and step S2;

[0018] S4: Stop feeding the old foundry sand into the feeding end of the conveying trough, and stop the spiral blade from rotating; take out the square tube in the water receiving area, and pour out the iron-containing waste sand in the square tube; move the remaining square tube in the water trough toward the water receiving area; put the empty square tube after pouring out the iron-containing waste sand into the pumping area;

[0019] S5: Alternately execute step S3 and step S4.

[0020] Optionally, when executing step S1 and step S2, the spray head sprays water obliquely downward from the discharge end to the feed end to drive the scum to the feed end, so that the scum falls from the third overflow port into the water receiving area below with the overflowing water.

[0021] The working principle of the present invention is: the electromagnet is energized, and the first power source drives the spiral blade to rotate. The used foundry sand is put into the feed end of the conveying trough, and the spiral blade will stir and turn the used foundry sand while pushing the used foundry sand to the discharge end. In this way, the iron-containing waste sand will be adsorbed on the surface of the hollow shaft and the spiral blade; at this time, the used foundry sand that has been washed and magnetically separated is discharged from the discharge port; these used foundry sands can be sent to the drying equipment to remove moisture to complete the regeneration process and realize recycling. Stop feeding the used foundry sand into the feed end of the conveying trough; when no more used foundry sand is discharged from the discharge port, the electromagnet is powered off; the iron-containing waste sand will fall from the surface of the hollow shaft and the spiral blade, and will be pushed to the discharge port by the spiral blade for discharge; these iron-containing waste sands can be collected for other purposes or directly treated as waste.

[0022] It can be seen that the beneficial effects of the present invention are: magnetic separation and washing of old foundry sand can be carried out at the same time, thereby improving the processing efficiency; and the operating process between magnetic separation and washing is reduced, thereby eliminating at least one transfer equipment and further reducing the occupied workshop area. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 Schematic diagram of a single magnetic separation washing device for a magnetic separation washing device;

[0025] Figure 2 It is a schematic diagram of the assembly of the hollow shaft and the electromagnet;

[0026] Figure 3 Schematic diagram of inserting the electromagnet into the hollow shaft;

[0027] Figure 4 A schematic diagram of a first water filtering mechanism and a second water filtering mechanism being arranged in a water tank;

[0028] Figure 5 is a schematic diagram of the alternating distribution of the first water filtering mechanism and the second water filtering mechanism;

[0029] Figure 6 is a schematic structural diagram of a first filter cartridge;

[0030] Figure 7 A schematic diagram of providing a first water outlet for a first filter cartridge;

[0031] Figure 8 is a schematic structural diagram of the second filter cartridge;

[0032] Fig. 9 A schematic diagram of setting a guide trough for a magnetic separation washing device;

[0033] Fig.10 It is a schematic diagram of the alternating distribution of the first magnetic separation washing device and the second magnetic separation washing device;

[0034] Fig.11 It is a schematic diagram of the assembly of two magnetic separation washing devices;

[0035] Fig.12 Schematic diagram of setting guide rails and second rollers for the magnetic separation washing device.

[0036] Figure numerals: 1, conveying trough; 2, spiral blade; 3, first power source; 4, hollow shaft; 5, electromagnet; 6, third overflow port; 7, discharge port; 8, sprinkler head; 9, connecting ring; 10, radial through hole; 11, threaded hole; 12, shield; 13, annular groove; 14, water trough; 15, water receiving area; 16, water pumping area; 17, water pumping pipe; 18, water pumping pump; 19, sieve plate; 20, first water filtering mechanism; 21, second water filtering mechanism; 2 2. First filter cartridge; 23. First overflow port; 24. First water outlet; 25. Second filter cartridge; 26. Second water outlet; 27. Second overflow port; 28. Material guide trough; 29. ​​Second power source; 30. First roller; 31. Step trough; 32. First magnetic separation and washing device; 33. Second magnetic separation and washing device; 34. Guide rail; 35. Second roller; 36. Positioning hole; 37. Positioning piece; 38. Drain port; 39. Interface; 40. Water outlet. DETAILED DESCRIPTION

[0037] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0038] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "front", "rear", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0042] Example 1

[0043] like Figure 1 , Figure 3 As shown, an embodiment of the present invention provides a magnetic separation and washing device for foundry waste sand. The magnetic separation and washing device includes: a magnetic separation and washing device. The magnetic separation and washing device includes: a conveying trough 1 extending in the left and right directions, a spiral blade 2 arranged in the conveying trough 1, and a first power source 3 for driving the spiral blade 2 to rotate. It should be understood that the first power source 3 is usually configured as a rotary motor, and a servo motor among rotary motors is preferably selected. The spiral blade 2 has a hollow shaft 4, and an electromagnet 5 is installed in the hollow shaft 4. One end of the conveying trough 1 constitutes a feed end, and is provided with a third overflow port 6; the other end of the conveying trough 1 constitutes a discharge end, and is provided with a discharge port 7. The conveying trough 1 is tilted upward from the feed end to the discharge end, so that the top of the discharge port 7 is higher than the liquid level in the conveying trough 1. It should be understood that the height of the liquid level in the conveying trough 1 depends on the height of the third overflow port 6. If the top of the discharge port 7 is higher than the third overflow port 6, the top of the discharge port 7 can be higher than the liquid level in the conveying trough 1. A spray head 8 is provided above the conveying trough 1. The spray head 8 sprays water toward the end of the liquid surface close to the discharge port 7 to drive the scum floating on the liquid surface to the feed end. It should be understood that the spray head 8 can spray water obliquely downward from the discharge end to the feed end to drive the scum floating on the liquid surface to the feed end to avoid the scum adhering to the surface of the old foundry sand and being carried out.

[0044] The specific implementation of the magnetic separation and washing equipment is described below: the electromagnet 5 is energized, and the first power source 3 drives the spiral blade 2 to rotate. The used foundry sand is put into the feed end of the conveying trough 1, and the spiral blade 2 will stir and turn the used foundry sand while pushing the used foundry sand to the discharge end. In this way, the iron-containing waste sand will be adsorbed on the surface of the hollow shaft 4 and the spiral blade 2; at this time, the used foundry sand that has been washed and magnetically separated is discharged from the discharge port 7; these used foundry sands can be sent to the drying equipment to remove moisture to complete the regeneration process and realize recycling. Stop feeding the used foundry sand into the feed end of the conveying trough 1; when there is no more used foundry sand discharged from the discharge port 7, the electromagnet 5 is de-energized; the iron-containing waste sand will fall from the surface of the hollow shaft 4 and the spiral blade 2, and will be pushed to the discharge port 7 by the spiral blade 2 for discharge; these iron-containing waste sands can be collected for other purposes or directly treated as waste. The magnetic separation and washing equipment can simultaneously perform magnetic separation and washing on old foundry sand, thereby improving processing efficiency; and reducing the operating process between magnetic separation and washing, thereby eliminating at least one transfer equipment and further reducing the occupied workshop area.

[0045] Example 2

[0046] like Figure 1 to Figure 3 As shown, on the basis of Example 1, the two ends of the hollow shaft 4 are rotatably connected to the ends of the conveying trough 1 through sealed bearings respectively; one end of the hollow shaft 4 is closed and connected to the first power source 3, and the other end has a port for taking the discharge magnet 5; the outer end of the electromagnet 5 has a connecting ring 9 surrounding the outer circumference, and the outer end of the connecting ring 9 is fixedly connected to the outer end of the electromagnet 5; the inner diameter of the connecting ring 9 is larger than the outer diameter of the electromagnet 5, so as to form an annular groove 13 for inserting the port of the hollow shaft 4 therebetween; the connecting ring 9 has a radial through hole 10, and the outer peripheral wall of the hollow shaft 4 is correspondingly provided with a threaded hole 11, and is adapted to connect bolts; a shield 12 for shielding the outer end of the electromagnet 5 is installed at the end of the conveying trough 1, a slip ring is installed in the shield 12, and a brush matching the slip ring is installed at the outer end of the electromagnet 5.

[0047] It should be understood that one end of the electromagnet 5 inserted into the hollow shaft 4 is the inner end, and the other end is the outer end. Insert the inner end of the electromagnet 5 into the hollow shaft 4, insert the port of the hollow shaft 4 into the annular groove 13 at the outer end of the electromagnet 5, make the radial through hole 10 of the connecting ring 9 correspond to the threaded hole 11 of the hollow shaft 4, and screw on the connecting bolts, and then the electromagnet 5 can be installed in the hollow shaft 4. Then install the shield 12 at the end of the conveying trough 1, and connect the slip ring with the power supply, so that the electromagnet 5 can be powered by the cooperation of the slip ring and the brush. Of course, according to the actual needs, other means can also be used to power the rotating electromagnet 5.

[0048] Example 3

[0049] like Figure 1, Figure 4 As shown, on the basis of Example 1 or Example 2, the magnetic separation washing device further includes: a water tank 14 located below the conveying tank 1; the water tank 14 is divided into a plurality of water filtering areas along the left-right direction, and each water filtering area is respectively provided with a water filtering mechanism; the water filtering area located at one end of the water tank 14 corresponds to the third overflow port 6, constituting a water receiving area 15; the water filtering area located at the other end of the water tank 14 constitutes a water pumping area 16; the spray head 8 is connected to the water pumping area 16 through a water pumping pipe 17, and is adapted to a water pump 18.

[0050] It should be understood that the water pump 18 can be used to pump water from the pumping area 16 and spray it to the liquid surface near the discharge port 7 in the conveying trough 1 through the sprinkler head 8. The water in the conveying trough 1 will be discharged from the third overflow port 6 at the feed end and fall into the water receiving area 15. The water in the water tank 14 will flow from the water receiving area 15 to the pumping area 16 and be filtered by various water filtering mechanisms along the way. The magnetic separation and washing of old foundry sand are both large water users. The present invention realizes the recycling of water through the aforementioned method, which can not only save a large amount of water resources, but also improve the cleaning effect of old foundry sand. In addition, a sewage outlet 38 connected to the sewage pump can be set at the bottom of the water receiving area 15, and a valve can be adapted to regularly discharge the mud deposited at the bottom of the water receiving area 15. The conveying trough 1 and the water tank 14 can be connected by welding, bolting, etc.

[0051] Example 4

[0052] like Figures 4 to 8 As shown, on the basis of Example 3, the water filtering mechanism includes: a square tube, a sieve plate 19 that divides the square tube into an upper layer and a lower layer, and a filter material laid on the upper layer; wherein the water filtering mechanism is divided into a first water filtering mechanism 20 and a second water filtering mechanism 21; the square tube of the first water filtering mechanism 20 constitutes a first filter cartridge 22, and the first filter cartridge 22 is provided with a first overflow port 23 on the left side of the upper layer and a first water outlet 24 on the right side of the lower layer; the square tube of the second water filtering mechanism 21 constitutes a second filter cartridge 25, and the second filter cartridge 25 is provided with a second water outlet 26 on the left side of the lower layer and a second overflow port 27 on the right side of the upper layer; the first water filtering mechanism 20 and the second water filtering mechanism 21 are alternately distributed in the water tank 14; adjacent first water outlets 24 and second water outlets 26 are correspondingly connected, and adjacent first overflow ports 23 and second overflow ports 27 are correspondingly connected.

[0053] It should be understood that when the water tank 14 sets the water receiving area 15 at the left end and the water pumping area 16 at the right end, the water in the water tank 14 flows from left to right; at this time, the water will flow from the first overflow port 23 into the upper layer of the first filter cartridge 22, pass through the filter material in the first filter cartridge 22, and flow out from the first water port 24 of the lower layer of the first filter cartridge 22; and the water will flow from the second water port 26 into the lower layer of the second filter cartridge 25, pass through the filter material in the second filter cartridge 25, and flow out from the second overflow port 27 of the upper layer of the second filter cartridge 25. In this way, when the water in the water tank 14 flows from the water receiving area 15 to the water pumping area 16, it can pass through the filter material of each water filtering mechanism and be fully filtered. When the water tank 14 sets the water receiving area 15 at the right end and the water pumping area 16 at the left end, the water filtering principle is similar and will not be repeated here. In addition, a handle can be set on the top of the square tube to facilitate the placement of the square tube.

[0054] Example 5

[0055] like Figure 1 , Figure 4 , Fig. 9 As shown, on the basis of Example 4, the magnetic separation and washing device also includes: a material guide trough 28 extending in the left and right directions; the material guide trough 28 is adapted to drive a second power source 29 to move left and right so as to leave or intercept below the discharge port 7; the material guide trough 28 is open at one end close to the pumping area 16 and closed at one end away from the pumping area 16; when the material guide trough 28 is intercepted below the discharge port 7, the iron-containing waste sand discharged from the discharge port 7 slides along the material guide trough 28 into the upper layer of the square cylinder of the pumping area 16.

[0056] It should be understood that the feeding of the foundry waste sand to the feeding end of the conveying trough 1 is stopped; when there is no more foundry waste sand discharged from the discharge port 7, the second power source 29 drives the guide trough 28 to intercept below the discharge port 7; then the electromagnet 5 is powered off to make the iron-containing waste sand fall and be pushed to the discharge port 7 by the spiral blade 2; the iron-containing waste sand can slide along the guide trough 28 into the upper layer of the square cylinder of the pumping area 16 to become filter material. Using the iron-containing waste sand as filter material, using local materials and waste utilization is conducive to reducing the recycling and processing cost of foundry waste sand. When the upper layer of the square tube in the pumping area 16 is about to be filled with iron-containing waste sand, the feeding of the foundry waste sand into the feeding end of the conveying trough 1 can be stopped, and the spiral blade 2 can be stopped from rotating; then the square tube in the water receiving area 15 is taken out, and the iron-containing waste sand on the upper layer of the square tube is poured out and treated as waste; then the remaining square tube in the water tank 14 is moved one position toward the water receiving area 15; finally, the empty square tube after pouring out the iron-containing waste sand is put into the pumping area 16. In this way, the iron-containing waste sand can be fully utilized and gradient filtration can be achieved. From the water receiving area 15 to the pumping area 16, the iron-containing waste sand and water are getting cleaner and cleaner. The second power source 29 can be set as a linear drive device such as a cylinder or an electric push rod.

[0057] Example 6

[0058] like Figure 1 , Figures 4 to 8 As shown, based on Example 5, the square tube is provided with first rollers 30 at the top of the front and rear sides respectively; the front and rear inner walls of the water tank 14 are provided with step grooves 31 extending in the left and right directions respectively for the first rollers 30 to move.

[0059] It should be understood that, by adopting the above structure, the square tube can be directly pushed from the pumping area 16 to the water receiving area 15 in the water tank 14; in this way, the bottom of the square tube will also push the mud deposited at the bottom of the water tank 14 to the water receiving area 15; in this way, it is only necessary to set a sewage outlet 38 connected to the sewage pump at the bottom of the water receiving area 15 and adapt the valve to regularly discharge the mud deposited at the bottom of the water tank 14. The lower end surface of the square tube is flush with the bottom surface of the tank 14, and no friction will be generated. The square tube is supported by the first roller 30. In addition, an interface 39 can be set on the front wall or rear wall of the pumping area 16 of the water tank 14, and a filter screen can be set on the interface 39 to connect the lower end of the pumping pipe 17 or the inlet of the pumping pump 18; accordingly, the square tube is provided with a water outlet 40 on its front wall or rear wall, so that the water in the square tube of the pumping area 16 can be sucked into the pumping pipe 17 or the pumping pump 18 through the water outlet 40 and the interface 39.

[0060] Example 7

[0061] like Fig.10 As shown, on the basis of Example 5 or Example 6, a plurality of magnetic separation washing devices are arranged in the up and down directions, and are divided into a first magnetic separation washing device 32 and a second magnetic separation washing device 33; the first magnetic separation washing device 32 and the second magnetic separation washing device 33 are alternately distributed in the up and down directions; the discharge port 7 of the first magnetic separation washing device 32 corresponds to the receiving end of the second magnetic separation washing device 33 up and down, and the receiving end of the first magnetic separation washing device 32 corresponds to the discharge port 7 of the second magnetic separation washing device 33 up and down.

[0062] It should be understood that multiple magnetic separation and washing devices are arranged in the up and down directions; the second power source 29 of the magnetic separation and washing device drives the guide trough 28 to leave the bottom of the discharge port 7, and the old foundry sand discharged from the discharge port 7 of the magnetic separation and washing device can fall into the feed end of the conveying trough 1 of the adjacent magnetic separation and washing device below; in this way, graded magnetic separation and graded washing can be achieved, thereby improving the magnetic separation effect and the washing effect. In addition, the magnetic separation and washing device can also be provided with a receiving hopper at the feed end of the conveying trough 1 to better receive the old foundry sand dropped from above. In addition, the foundry is different from the sand making plant, and its main business is casting rather than producing foundry sand. Therefore, the amount of foundry old foundry sand that needs to be processed by the foundry every day is not huge; at the same time, the main area of ​​the workshop needs to be reserved for casting. The above structure is conducive to reducing the size of a single magnetic separation and washing device, and can make full use of the space, thereby further reducing the workshop area occupied by the magnetic separation and washing equipment.

[0063] Example 8

[0064] like Fig.11 , Fig.12 As shown, on the basis of Example 7, for any two adjacent magnetic separation and washing devices, the magnetic separation and washing device located at the bottom is provided with a plurality of guide rails 34 with slide grooves along the left-right direction at the top of the conveying trough 1, and the magnetic separation and washing device located at the top is provided with a matching second roller 35 at the bottom of the water trough 14; the guide rail 34 extends along the front-to-back direction, and a groove is provided on the upper edge of the slide groove; the guide rail 34 is provided with downwardly extending positioning holes 36 at the front and rear ends of the slide groove, respectively, for inserting a positioning member 37 that limits the second roller 35.

[0065] It should be understood that when the magnetic separation and washing device is small in size and light in weight, multiple magnetic separation and washing devices can be stacked or disassembled by forklift or hoisting. Align the second roller 35 of the upper magnetic separation and washing device and place it in the slide groove of the guide rail 34 of the lower magnetic separation and washing device, and then push the upper magnetic separation and washing device along the guide rail 34 to adjust the position; this can reduce the difficulty of alignment during assembly and make it more convenient; it is also more convenient to disassemble later. The guide rail 34 is provided with a bevel on the upper edge of the slide groove to facilitate the alignment of the second roller 35 and place it in the slide groove of the guide rail 34, which can make assembly more convenient. In addition, the magnetic separation and washing device at the bottom may not be provided with the second roller 35, and the magnetic separation and washing device at the top may not be installed with the guide rail 34.

[0066] Example 9

[0067] The embodiment of the present invention further provides a magnetic separation and washing method for used foundry sand, which uses the magnetic separation and washing device for used foundry sand described in any one of Embodiments 5 to 8, and includes the following steps:

[0068] S1: energize the electromagnet 5, and make the second power source 29 drive the guide trough 28 to leave the bottom of the discharge port 7; feed the used foundry sand into the feed end of the conveying trough 1, and make the first power source 3 drive the spiral blade 2 to rotate; make the spiral blade 2 stir and turn the used foundry sand while pushing the used foundry sand to the discharge end; thereby, the iron-containing waste sand is adsorbed on the surface of the hollow shaft 4 and the spiral blade 2, and the used foundry sand that has been washed and magnetically separated is discharged from the discharge port 7.

[0069] S2: Stop feeding the old foundry sand into the feeding end of the conveying trough 1; when no more old foundry sand is discharged from the discharge port 7, the second power source 29 drives the guide trough 28 to be intercepted below the discharge port 7; then the electromagnet 5 is powered off to make the iron-containing waste sand fall and be pushed to the discharge port 7 by the spiral blade 2; thus, the iron-containing waste sand slides along the guide trough 28 into the upper layer of the square cylinder of the pumping area 16 to become filter material. It should be understood that when the guide trough 28 is intercepted below the discharge port 7, the second power source 29 can also drive the guide trough 28 to move back and forth in a small range in the left and right direction, so that the iron-containing waste sand can slide along the guide trough 28 better.

[0070] S3: Alternately execute step S1 and step S2. It should be understood that when executing step S2, when no more iron-containing waste sand is discharged from the discharge port 7, step S2 is stopped and step S1 is executed again. The single round execution time of step S1 can be adjusted and set by the staff according to the actual situation.

[0071] S4: Stop feeding the old foundry sand into the feeding end of the conveying trough 1, and stop the rotation of the spiral blade 2; take out the square tube in the water receiving area 15, and pour out the iron-containing waste sand on the upper layer of the square tube; move the remaining square tube in the water trough 14 one position toward the water receiving area 15; put the empty square tube after pouring out the iron-containing waste sand into the pumping area 16.

[0072] S5: Alternately perform step S3 and step S4. It should be understood that, generally, when the upper layer of the square tube in the pumping area 16 is about to be filled with iron-containing waste sand, step S3 is stopped and step S4 is started. After completing step S4, step S3 is re-executed.

[0073] Example 10

[0074] On the basis of Example 9; when executing step S1 and step S2, the spray head 8 sprays water obliquely downward from the discharge end to the feed end to drive the scum to the feed end, so that the scum falls from the third overflow port 6 to the water receiving area 15 below with the overflowing water.

[0075] Although specific embodiments of the present invention are described above, those skilled in the art should understand that various changes or modifications may be made to these embodiments without departing from the principles and essence of the present invention, and these changes and modifications are all within the scope of protection of the present invention.

Claims

1. Magnetic separation and washing equipment for foundry waste sand, characterized by: include: Magnetic separation washing device; The magnetic separation washing device comprises: a conveying trough (1) extending in the left-right direction, a spiral blade (2) arranged in the conveying trough (1), and a first power source (3) for driving the spiral blade (2) to rotate; The spiral blade (2) has a hollow shaft (4), and an electromagnet (5) is installed in the hollow shaft (4); One end of the conveying trough (1) constitutes a feed end and is provided with a third overflow port (6); the other end of the conveying trough (1) constitutes a discharge end and is provided with a discharge port (7); The conveying trough (1) is inclined upward from the feeding end to the discharging end so that the top of the discharging port (7) is higher than the liquid level in the conveying trough (1); A spray head (8) is provided above the conveying trough (1); The spray head (8) sprays water toward one end of the liquid surface close to the discharge port (7) to drive the scum floating on the liquid surface toward the feed end; The magnetic separation and washing device further comprises: a water tank (14) located below the conveying tank (1); The water tank (14) is divided into a plurality of water filtering areas along the left-right direction, and each water filtering area is provided with a water filtering mechanism; The water filtering area at one end of the water tank (14) corresponds to the third overflow port (6) and constitutes a water receiving area (15); the water filtering area at the other end of the water tank (14) constitutes a water pumping area (16); The spray head (8) is connected to the water pumping area (16) through a water pumping pipe (17) and is adapted to be equipped with a water pump (18); The water filtering mechanism comprises: a square tube, a sieve plate (19) which divides the square tube into an upper layer and a lower layer, and filter material spread on the upper layer; in, The water filtering mechanism is divided into a first water filtering mechanism (20) and a second water filtering mechanism (21); The square cylinder of the first water filtering mechanism (20) constitutes a first filter cylinder (22), and the first filter cylinder (22) is provided with a first overflow port (23) on the left side of the upper layer and a first water outlet (24) on the right side of the lower layer; The square cylinder of the second water filtering mechanism (21) constitutes a second filter cylinder (25), and the second filter cylinder (25) is provided with a second water outlet (26) on the left side of the lower layer and a second overflow outlet (27) on the right side of the upper layer; The first water filtering mechanism (20) and the second water filtering mechanism (21) are alternately distributed in the water tank (14); adjacent first water outlets (24) and second water outlets (26) are correspondingly connected, and adjacent first overflow outlets (23) and second overflow outlets (27) are correspondingly connected; The magnetic separation and washing device further comprises: a material guide trough (28) extending in the left-right direction; The material guide trough (28) is adapted to be driven by a second power source (29) to move left and right so as to leave or be intercepted below the material outlet (7); The material guide trough (28) is open at one end close to the water pumping area (16) and closed at one end away from the water pumping area (16); When the guide trough (28) is intercepted below the discharge port (7), the iron-containing waste sand discharged from the discharge port (7) slides along the guide trough (28) into the upper layer of the square cylinder in the pumping area (16) to become filter material; The square tube is provided with first rollers (30) at the top of the front and rear sides respectively; the front and rear inner walls of the water tank (14) are provided with step grooves (31) extending in the left and right directions respectively for the first rollers (30) to move.

2. The magnetic separation and washing equipment for used foundry sand according to claim 1 is characterized in that: Both ends of the hollow shaft (4) are rotatably connected to the ends of the conveying trough (1) via sealed bearings; One end of the hollow shaft (4) is closed and connected to the first power source (3), and the other end has a port for taking out the discharge magnet (5); The outer end of the electromagnet (5) has a connecting ring (9) surrounding the outer circumference, and the outer end of the connecting ring (9) is fixedly connected to the outer end of the electromagnet (5); The inner diameter of the connecting ring (9) is larger than the outer diameter of the electromagnet (5), so as to form an annular groove (13) between the two for inserting the end of the hollow shaft (4); The connecting ring (9) has a radial through hole (10), and the outer peripheral wall of the hollow shaft (4) is correspondingly provided with a threaded hole (11) adapted to accommodate a connecting bolt; A shield (12) for shielding the outer end of the electromagnet (5) is installed at the end of the conveying trough (1), a slip ring is installed in the shield (12), and a brush matching the slip ring is installed at the outer end of the electromagnet (5).

3. The magnetic separation and washing equipment for used foundry sand according to claim 1 or 2, characterized in that: The magnetic separation and washing device is arranged in a plurality in the up-down direction and is divided into a first magnetic separation and washing device (32) and a second magnetic separation and washing device (33); The first magnetic separation and washing device (32) and the second magnetic separation and washing device (33) are alternately distributed in the up and down directions; The material discharge port (7) of the first magnetic separation washing device (32) corresponds to the material receiving end of the second magnetic separation washing device (33) in upper and lower directions, and the material receiving end of the first magnetic separation washing device (32) corresponds to the material discharge port (7) of the second magnetic separation washing device (33) in upper and lower directions.

4. The magnetic separation and washing equipment for used foundry sand according to claim 3 is characterized in that: Any two adjacent magnetic separation and washing devices, the magnetic separation and washing device located at the bottom is provided with a plurality of guide rails (34) with slide grooves in the left-right direction at the top of the conveying trough (1), and the magnetic separation and washing device located at the top is provided with a matching second roller (35) at the bottom of the water trough (14); The guide rail (34) extends in the front-rear direction, and a groove is provided on the upper edge of the slide groove; The guide rail (34) is provided with positioning holes (36) extending downwards at the front and rear ends of the slide groove, respectively, for inserting a positioning member (37) for limiting the second roller (35).

5. A magnetic separation and washing method for used foundry sand, characterized in that: The magnetic separation and washing equipment for used foundry sand according to any one of claims 1 to 4 is used, and comprises the following steps: S1: The electromagnet (5) is energized, and the second power source (29) drives the guide trough (28) away from the bottom of the discharge port (7); the used foundry sand is fed into the feed end of the conveying trough (1), and the first power source (3) drives the spiral blade (2) to rotate; the spiral blade (2) stirs and turns the used foundry sand while pushing the used foundry sand toward the discharge end; thereby, the iron-containing waste sand is adsorbed on the surface of the hollow shaft (4) and the spiral blade (2), and the used foundry sand that has been washed and magnetically separated is discharged from the discharge port (7); S2: Stop feeding the old foundry sand into the feeding end of the conveying trough (1); when no more old foundry sand is discharged from the discharge port (7), the second power source (29) drives the guide trough (28) to intercept below the discharge port (7); then the electromagnet (5) is powered off, so that the iron-containing waste sand falls and is pushed by the spiral blade (2) to the discharge port (7) for discharge; thereby, the iron-containing waste sand slides along the guide trough (28) into the upper layer of the square cylinder in the pumping area (16) to become filter material; S3: alternately executing step S1 and step S2; S4: Stop feeding the old foundry sand into the feeding end of the conveying trough (1), and stop the rotation of the spiral blade (2); take out the square tube in the water receiving area (15), and pour out the iron-containing waste sand in the square tube; move the remaining square tube in the water trough (14) one position toward the water receiving area (15); put the empty square tube after pouring out the iron-containing waste sand into the water pumping area (16); S5: Alternately execute step S3 and step S4.

6. The magnetic separation and washing method for used foundry sand according to claim 5, characterized in that: When executing step S1 and step S2, the spray head (8) sprays water obliquely downward from the discharge end to the feed end to drive the scum toward the feed end, so that the scum falls from the third overflow port (6) into the water receiving area (15) below along with the overflowing water.

Images