Stone washing machine with iron removal function
By designing a stone washing machine with iron removal function, using agitation and pressure differences to separate iron filings in the sand and gravel, the existing stone washing machine clogging problem is solved, and efficient iron removal and anti-blocking effects are achieved.
Patent Information
- Application Number
- CN202422382735.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-09-29
AI Technical Summary
When cleaning sand and gravel, existing stone washing machines cannot effectively remove iron filings, resulting in blockage and affecting subsequent processing.
A stone washing machine with iron removal function is designed. By injecting water from below, and using stirring sand and gravel to separate impurities of different specific gravity, small specific gravity impurities flow out from above, large specific gravity impurities sink into the sewage collection tank, intermittently open and close the sewage discharge door, and quickly flush out large specific gravity debris by using the internal pressure changes of the sewage collection tank to prevent blockage.
It realizes effective separation of iron filings in sand and gravel, prevents blockage, ensures cleaning effect, and improves the efficiency of subsequent processing.
Smart Images
Figure CN223209624U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of stone washers, in particular to a stone washer with an iron removal function. Background Art
[0002] Stone washing machine, also known as sand washing machine, is used for desludging and screening of large amounts of sand and gravel in construction sites, sand and gravel plants, prefabrication plants and hydropower sites. It can also be used for ore sorting. Stone washing machine can be roughly divided into many types. Spiral stone washing machine is the most common. Stone washing machine is used to clean the sand and gravel excavated and mined. It mainly uses water to clean. The sand and gravel mined from the river bottom or rock layer are mixed with a large amount of impurities. A stone washing machine is needed to separate the soil and sand from the sand and gravel. When the existing stone washing machine is working, the sand and gravel are sent into the stone washing machine, and the sand and gravel are tumbled and stirred by the blades. Use a high-pressure water gun to spray water on the sand and gravel from above. The washed soil and impurities are discharged through the drainage net, and the clean sand and gravel are transported to the discharge port through the spiral vane. The traditional stone washing machine uses the high-pressure water gun above to spray water and the blades to stir the sand and gravel to achieve the purpose of cleaning. All impurities inside the sand and gravel will flow to the drainage net below. Among them, large and light impurities such as branches and leaves will accumulate on the surface of the drainage net, causing blockage of the drainage pipe. It does not have the iron removal function. The sand and gravel after cleaning often contain a large amount of iron filings, which will affect the subsequent processing. For this reason, we propose a stone washing machine with iron removal function. Utility Model Content
[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a stone washing machine with iron removal function. The stone washing machine has the iron removal function, takes in water from the bottom, separates impurities of different specific gravities by stirring sand and gravel, and impurities of small specific gravity flow out from the top, and impurities of large specific gravity sink into the sewage collection tank. Then, the sewage discharge door is opened and closed intermittently, and the internal pressure of the sewage collection tank is continuously changed to quickly flush out the large specific gravity debris, thereby preventing the occurrence of blockage, which can effectively solve the problems in the background technology.
[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a stone washing machine with iron removal function, comprising a bracket and an anti-clogging stone washing and iron removal mechanism;
[0005] Bracket: The upper end of the bracket is provided with a shell, and the upper end of the shell is provided with an overflow port;
[0006] The hopper is provided with a sliding block, and the front end of the hopper is provided with a mounting block. The sliding block is slidably connected to the inner middle of the mounting block. The lower end of the outer surface of the sliding block is fixedly connected to the front lower end of the hopper door, and the rear end of the upper end of the outer surface of the sliding block is rotatably connected to the rotating wheel. The tension spring is provided between the lower middle end of the sliding block and the upper end of the mounting block. The tension spring is sleeved on the outer surface of the sliding block to provide a basis for opening and closing the hopper door.
[0007] Furthermore, the anti-clogging stone washing and iron removal mechanism also includes a water gushing component, which includes a water gushing head and a water inlet pipe. The water gushing heads are evenly arranged in the middle of the front end of the bottom wall of the shell, and the upper end of the water gushing head is provided with evenly distributed water gushing holes. The water inlet pipe is arranged inside the sewage collection tank, and the lower end of the water gushing head is connected to the inside of the water inlet pipe, which can quickly flush out impurities with low specific gravity.
[0008] Furthermore, the anti-clogging stone washing and iron removal mechanism also includes a stone washing assembly, and the stone washing assembly also includes a rotating shaft, a cam, a spiral piece and a stirring blade. The rotating shaft is rotatably connected to the inside of the shell, and the cam is arranged at the front end of the rotating shaft. The outer edge of the cam is matched with the outer edge of the rotating wheel, and the spiral piece is evenly arranged on the rear side of the outer surface of the rotating shaft. The stirring blade is evenly arranged on the front side of the outer surface of the rotating shaft, which can quickly turn over the sand and gravel to separate impurities and transport the washed sand and gravel backward.
[0009] Furthermore, the anti-clogging stone washing and iron removal mechanism also includes a driving component, which includes a motor, a reduction gear and a pulley. The motors are all arranged on the rear side of the upper end of the shell, and the input end of the motor is electrically connected to the output end of the single-chip microcomputer. The reduction gears are all arranged at the rear end of the shell, and the output shafts of the reduction gears are fixedly connected to the rear ends of the longitudinally adjacent rotating shafts. The rear ends of the output shafts of the motor and the rear ends of the reduction shafts of the reduction gears are both provided with pulleys. The diameter of the pulley at the upper end is smaller than the diameter of the pulley at the lower end. The two vertically adjacent pulleys are connected by belt transmission, providing stable drive for the separation of impurities and the transportation of sand and gravel.
[0010] Furthermore, the anti-clogging stone washing and iron removal mechanism also includes an iron removal component, which includes a vibrating screen and a vibrating motor. The vibrating screen is arranged in the middle of the upper rear side of the bracket, and the upper end of the vibrating screen is provided with evenly distributed sieve holes. The vibrating motor is arranged in the middle of the bottom end of the vibrating screen. The input end of the vibrating motor is electrically connected to the output end of the single-chip microcomputer, which can quickly shake off the moisture on the surface of the sand and gravel and keep the sand and gravel vibrating evenly.
[0011] Furthermore, the iron removal component also includes a self-unloading electromagnetic iron remover, which is arranged on the rear side of the upper end of the bracket through a connecting frame. The input end of the self-unloading electromagnetic iron remover is electrically connected to the output end of the single-chip microcomputer. The lower end of the self-unloading electromagnetic iron remover is installed in conjunction with the upper end of the vibrating screen, which can quickly remove iron filings inside the sand and gravel.
[0012] Furthermore, it also includes a single-chip microcomputer, which is arranged on the front side of the right end of the bracket. The input end of the single-chip microcomputer is electrically connected to an external power supply to provide a control effect for the iron removal and stone washing work.
[0013] Compared with the prior art, the beneficial effects of the present invention are: the stone washing machine with iron removal function has the following advantages:
[0014] 1. The single-chip microcomputer controls the operation of the motors, and the output shafts of the two motors rotate inward synchronously. At this time, the two vertically adjacent pulleys are connected by belt transmission, driving the reduction gearbox to rotate, and the reduction gearbox then drives the shaft to rotate. The stirring blades also rotate synchronously to stir the surrounding sand and water, and separate the sand and gravel from the internal impurities. At this time, the mud on the surface of the sand and gravel is mixed with water to form mud, which is stored in the sewage collection tank through the sewage net. Impurities such as leaves and branches with low specific gravity are continuously floated by the high-pressure water gushing out of the water hole, and then flow out through the overflow port. As the shaft rotates, the cam also rotates. When the raised part of the cam contacts the rotating wheel, as the cam rotates, the raised part of the cam squeezes the rotating wheel, causing the rotating wheel to move up with the sliding column. The tension spring is expanded under force, and the sewage door moves upward. At this time, the sewage trough is opened, the pressure at the front end of the sewage trough is small, and the pressure inside the sewage trough is large. The mud is discharged from the front end of the sewage trough by gravity and pressure. When the raised part of the cam leaves the rotating wheel, the rotating wheel is not under force, and the tension spring is not forced to shrink, driving the sliding column and the sewage door back to their original position. The sewage trough continues to store mud, and impurities with small specific gravity continue to flow out from the overflow port driven by water flow, and so on. Water enters from the bottom, and impurities with different specific gravity are separated by stirring sand and gravel. Impurities with small specific gravity flow out from the top, and impurities with large specific gravity sink into the sewage trough. Then the sewage door is opened and closed intermittently, and the high-density debris is quickly flushed out by constantly changing the internal pressure of the sewage trough to prevent blockage.
[0015] 2. As the shaft rotates, the two meshing spiral sheets drive the sand and gravel to move upward, and then the sand and gravel fall into the inside of the vibrating screen. The single-chip vibration motor drives the vibrating screen to vibrate, shake off the moisture on the surface of the sand and gravel, and keep the sand and gravel moving backward in a vibrating state. When the vibrating sand and gravel pass under the self-unloading electromagnetic iron remover, the single-chip computer controls the self-unloading electromagnetic iron remover to work. The self-unloading electromagnetic iron remover uses the electromagnet to absorb the iron filings mixed in the sand and gravel onto the conveyor belt. After the conveyor belt leaves the electromagnet area with the iron filings, the iron filings automatically fall off, completing the iron removal work. The sand and gravel after iron removal fall from the rear end of the vibrating screen, completing the stone washing and iron removal work, and quickly removing the iron filings mixed in the sand and gravel. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the structure of the utility model;
[0017] Figure 2 This is a schematic diagram of the cross-sectional structure of the anti-clogging stone washing and iron removal mechanism of the utility model;
[0018] Figure 3 This is a structural diagram of the stone washing assembly of the utility model;
[0019] Figure 4 This is a structural diagram of the water gushing component of the utility model.
[0020] In the figure: 1 bracket, 2 shell, 3 single chip microcomputer, 4 anti-clogging stone washing and iron removal mechanism, 41 sewage collecting tank, 42 sewage net, 43 sewage door, 44 sliding column, 45 tension spring, 46 water gushing assembly, 461 water gushing head, 462 water inlet pipe, 47 stone washing assembly, 471 rotating shaft, 472 cam, 473 spiral piece, 474 stirring blade, 48 driving assembly, 481 motor, 482 reduction box, 483 pulley, 49 iron removal assembly, 491 vibrating screen, 492 vibrating motor, 493 self-unloading electromagnetic iron remover. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0022] See also Figure 1-4 , this embodiment provides a technical solution: a stone washing machine with iron removal function, comprising a bracket 1 and an anti-clogging stone washing and iron removal mechanism 4;
[0023] Bracket 1: A housing 2 is provided at the upper end thereof, and an overflow port is provided at the upper side of the housing 2 to facilitate the discharge of impurities with high specific gravity. The housing 2 also includes a single-chip microcomputer 3, which is arranged at the front right end of the bracket 1. The input end of the single-chip microcomputer 3 is electrically connected to an external power supply to provide a control effect for the iron removal and stone washing process;
[0024] Anti-clogging stone washing and iron removal mechanism 4: It includes a sewage collecting trough 41, a sewage net 42, a sewage door 43, a sliding column 44 and a tension spring 45. The sewage collecting trough 41 is arranged on the front side of the lower end of the shell 2. The sewage collecting trough 41 is an inclined trough body with a low front and a high back. The sewage nets 42 are all arranged on the front side of the bottom wall of the shell 2. The sewage door 43 is slidably connected to the inside of the front side wall of the sewage collecting trough 41. The front end of the sewage collecting trough 41 is provided with a mounting block. The sliding columns 44 are slidably connected to the middle of the inner part of the mounting block. The lower end of the outer surface of the sliding column 44 is fixedly connected to the lower end of the front side of the sewage door 43. The rear side of the upper end of the outer surface of the sliding column 44 is rotatably connected to a rotating wheel. A tension spring 45 is provided between the lower middle end of the sliding column 44 and the upper end of the mounting block. The tension spring 45 is sleeved on the outer surface of the sliding column 44 for the sewage door 43 provides a basis for opening and closing, the anti-clogging stone washing and iron removal mechanism 4 also includes a water gushing component 46, the water gushing component 46 includes a water gushing head 461 and a water inlet pipe 462, the water gushing head 461 is evenly arranged in the middle of the front end of the bottom wall of the shell 2, the upper end of the water gushing head 461 is provided with evenly distributed water gushing holes, the water inlet pipe 462 is arranged inside the sump 41, and the lower end of the water gushing head 461 is connected to the inside of the water inlet pipe 462, which can quickly flush out impurities with a small specific gravity, and the anti-clogging stone washing and iron removal mechanism 4 also includes a stone washing component 47, the stone washing component 47 also includes a rotating shaft 471, a cam 472, a spiral sheet 473 and a stirring blade 474, the rotating shaft 471 is rotatably connected to the inside of the shell 2, and the cam 472 is arranged in front of the rotating shaft 471. The outer edge of the cam 472 is installed in conjunction with the outer edge of the rotating wheel, the spiral pieces 473 are evenly arranged on the rear side of the outer surface of the rotating shaft 471, the two spiral pieces 473 are meshed with each other, and the stirring blades 474 are evenly arranged on the front side of the outer surface of the rotating shaft 471, which can quickly turn over the sand and gravel to separate impurities and transport the cleaned sand and gravel backwards. The anti-clogging stone washing and iron removal mechanism 4 also includes a drive component 48, which includes a motor 481, a reduction gear 482 and a pulley 483. The motor 481 is arranged on the rear side of the upper end of the shell 2, and the input end of the motor 481 is electrically connected to the output end of the single-chip computer 3. The reduction gear 482 is arranged at the rear end of the shell 2, and the output shaft of the reduction gear 482 is fixedly connected to the rear end of the longitudinally adjacent rotating shaft 471. The rear end of the output shaft of 81 and the rear end of the reduction shaft of the reduction box 482 are both provided with pulleys 483. The diameter of the upper pulley 483 is smaller than that of the lower pulley 483. The two vertically adjacent pulleys 483 are connected by belt transmission to provide stable drive for the separation of impurities and the transportation of sand and gravel. The anti-clogging stone washing and iron removal mechanism 4 also includes an iron removal component 49. The iron removal component 49 includes a vibrating screen 491 and a vibrating motor 492. The vibrating screen 491 is arranged in the middle of the rear side of the upper end of the bracket 1. The vibrating screen 491 is an inclined screen body with a high front and a low back. The upper end of the vibrating screen 491 is provided with evenly distributed sieve holes. The vibrating motor 492 is arranged in the middle of the bottom end of the vibrating screen 491. The input end of the vibrating motor 492 is electrically connected to the output end of the single-chip computer 3.It can quickly shake off moisture from the surface of sand and gravel and keep the sand and gravel vibrating evenly. The iron removal component 49 also includes a self-unloading electromagnetic iron remover 493. The self-unloading electromagnetic iron remover 493 is arranged on the upper rear side of the bracket 1 through a connecting frame. The input end of the self-unloading electromagnetic iron remover 493 is electrically connected to the output end of the single-chip computer 3. The lower end of the self-unloading electromagnetic iron remover 493 is installed in conjunction with the upper end of the vibrating screen 491. It can quickly remove iron filings inside the sand and gravel and has an iron removal function. Water enters from the bottom and separates impurities of different specific gravities by stirring the sand and gravel. Impurities with low specific gravity flow out from the top, and impurities with high specific gravity sink into the sump. Then, the sewage door is intermittently opened and closed to quickly flush out high-density debris by constantly changing the internal pressure of the sump, preventing blockage.
[0025] The working principle of a stone washing machine with iron removal function provided by the present invention is as follows: when the stone washing machine is working, an external high-pressure water pump sends water into the water inlet pipe 462, and the high-pressure water flows into the interior of the shell 2 through the water gushing holes on the surface of the water gushing head 461. At this time, after the external conveying device sends sand and gravel into the front end of the interior of the shell 2, the single-chip microcomputer 3 controls the motor 481 to operate, and the output shafts of the two motors 481 rotate inward synchronously. At this time, the output shaft of the motor 481 drives the upper end pulley 483 to rotate. Since the diameter of the upper end pulley 483 is smaller than the diameter of the lower end pulley 483, the two pulleys 483 can form a transmission effect. The two vertically adjacent pulleys 483 are connected by belt transmission, driving the reduction box 482 to rotate. The reduction box 48 2 then drives the rotating shaft 471 to rotate, and the stirring blade 474 also rotates synchronously, stirring the surrounding sand and water, separating the sand and the internal impurities. At this time, the mud on the surface of the sand and the water mixes with the water to form mud, which is stored in the sewage collection tank 41 through the sewage discharge net 42. The impurities such as leaves and branches with small specific gravity are continuously floated by the high-pressure water gushing out of the water gushing hole, and then flow out through the overflow port. As the rotating shaft 471 rotates, the cam 472 also rotates. When the raised part of the cam 472 contacts the rotating wheel, as the cam 472 rotates, the raised part of the cam 472 squeezes the rotating wheel, causing the rotating wheel to move up with the sliding column 44, and the tension spring 45 is forced to expand, and the sewage discharge door 43 moves up. At this time, the sewage collection tank 41 is opened, and the front of the sewage collection tank 41 is opened. The pressure at the end is small, and the pressure inside the sump 41 is large. The mud is discharged from the front end of the sump 41 by the action of gravity and pressure. When the raised part of the cam 472 leaves the rotating wheel, the rotating wheel is not under force, and the tension spring 45 is not under force and contracts, driving the slide column 44 and the sewage discharge door 43 to return to their original position. The sump 41 continues to store mud, and impurities with small specific gravity continue to flow out from the overflow port driven by the water flow. This reciprocating process increases the amount of sand and gravel inside the shell 2, and the sand and gravel in the front will squeeze the cleaned sand and gravel at the rear and move backward. As the rotating shaft 471 rotates, the two meshing spiral pieces 473 drive the sand and gravel to move upward, and then the sand and gravel fall into the inside of the vibrating screen 491. The vibration motor 492 of the single-chip computer 3 drives the vibrating screen 491 to vibrate, shake off the moisture on the surface of the sand and gravel, and make the sand The stone keeps vibrating and moves backward. When the vibrating sand and gravel pass under the self-unloading electromagnetic iron remover 493, the single chip computer 3 controls the self-unloading electromagnetic iron remover 493 to work. The self-unloading electromagnetic iron remover 493 uses the electromagnet to adsorb the iron filings mixed in the sand and gravel on the conveyor belt. Then the conveyor belt leaves the electromagnet area with the iron filings, and the iron filings automatically fall off to complete the iron removal work. The sand and gravel after iron removal fall from the rear end of the vibrating screen 491 to complete the stone washing and iron removal work. It has the iron removal function, and water enters from the bottom. By stirring the sand and gravel, impurities of different specific gravity are separated. Impurities with small specific gravity flow out from the top, and impurities with large specific gravity sink into the sump. Then the sewage door is opened and closed intermittently, and the high-density debris is quickly flushed out by constantly changing the internal pressure of the sump to prevent blockage.
[0026] It is worth noting that the single-chip microcomputer 3 disclosed in the above embodiment is an S7-200 single-chip microcomputer, the motor 481 is a YBX3 motor, the vibration motor 492 is a YZS-10-6 vibration motor, the self-unloading electromagnetic iron remover 493 is an RCDD self-unloading electromagnetic iron remover, and the single-chip microcomputer 3 controls the motor 481, the vibration motor 492 and the self-unloading electromagnetic iron remover 493 using methods commonly used in the prior art.
[0027] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A stone washing machine with iron removal function, characterized by: It includes a bracket (1) and an anti-clogging stone washing and iron removal mechanism (4); The bracket (1) has a housing (2) at its inner upper end, and an overflow port at the side upper end of the housing (2); Anti-clogging stone washing and iron removal mechanism (4): It comprises a sewage collecting trough (41), a sewage discharge net (42), a sewage discharge door (43), a sliding column (44) and a tension spring (45), wherein the sewage collecting trough (41) is arranged on the front side of the lower end of the shell (2), the sewage discharge net (42) is arranged on the front side of the bottom wall of the shell (2), the sewage discharge door (43) is slidably connected to the inside of the front side wall of the sewage collecting trough (41), the front end of the sewage collecting trough (41) is provided with a mounting block, the sliding column (44) is slidably connected to the middle of the inside of the mounting block, the lower end of the outer surface of the sliding column (44) is fixedly connected to the lower end of the front side of the sewage discharge door (43), the rear side of the upper end of the outer surface of the sliding column (44) is rotatably connected to a rotating wheel, and a tension spring (45) is provided between the lower end of the middle part of the sliding column (44) and the upper end of the mounting block, and the tension spring (45) is sleeved on the outer surface of the sliding column (44).
2. The stone washing machine with iron removal function according to claim 1, characterized in that: It also includes a single-chip microcomputer (3), which is arranged on the front side of the right end of the bracket (1), and the input end of the single-chip microcomputer (3) is electrically connected to an external power supply.
3. The stone washing machine with iron removal function according to claim 1, characterized in that: The anti-clogging stone washing and iron removal mechanism (4) further comprises a water gushing assembly (46), the water gushing assembly (46) comprising a water gushing head (461) and a water inlet pipe (462), the water gushing head (461) being evenly arranged at the middle portion of the front end of the bottom wall of the shell (2), the upper end of the water gushing head (461) being provided with evenly distributed water gushing holes, the water inlet pipe (462) being arranged inside the sewage collecting tank (41), and the lower end of the water gushing head (461) being in communication with the interior of the water inlet pipe (462).
4. The stone washing machine with iron removal function according to claim 2, characterized in that: The anti-clogging stone washing and iron removal mechanism (4) further includes a stone washing assembly (47), and the stone washing assembly (47) further includes a rotating shaft (471), a cam (472), a spiral piece (473) and a stirring blade (474), wherein the rotating shaft (471) is rotatably connected to the interior of the housing (2), the cam (472) is arranged at the front end of the rotating shaft (471), the outer edge of the cam (472) is mounted in cooperation with the outer edge of the rotating wheel, the spiral piece (473) is evenly arranged on the rear side of the outer surface of the rotating shaft (471), and the stirring blade (474) is evenly arranged on the front side of the outer surface of the rotating shaft (471).
5. The stone washing machine with iron removal function according to claim 4, characterized in that: The anti-clogging stone washing and iron removal mechanism (4) further includes a drive assembly (48), the drive assembly (48) including a motor (481), a reduction gearbox (482) and a pulley (483). The motor (481) is arranged at the rear side of the upper end of the housing (2), the input end of the motor (481) is electrically connected to the output end of the single-chip microcomputer (3), the reduction gearbox (482) is arranged at the rear end of the housing (2), the output shaft of the reduction gearbox (482) is fixedly connected to the rear end of the longitudinally adjacent rotating shaft (471), the rear end of the output shaft of the motor (481) and the rear end of the reduction shaft of the reduction gearbox (482) are both provided with pulleys (483), the diameter of the upper pulley (483) is smaller than the diameter of the lower pulley (483), and the two vertically adjacent pulleys (483) are connected by belt transmission.
6. The stone washing machine with iron removal function according to claim 5, characterized in that: The anti-clogging stone washing and iron removal mechanism (4) further includes an iron removal component (49), the iron removal component (49) including a vibrating screen (491) and a vibration motor (492), the vibrating screen (491) being arranged at the middle portion of the rear side of the upper end of the bracket (1), the upper end of the vibrating screen (491) being provided with evenly distributed sieve holes, the vibration motor (492) being arranged at the middle portion of the bottom end of the vibrating screen (491), and the input end of the vibration motor (492) being electrically connected to the output end of the single-chip computer (3).
7. The stone washing machine with iron removal function according to claim 6, characterized in that: The iron removal assembly (49) further includes a self-unloading electromagnetic iron remover (493), which is arranged on the rear side of the upper end of the bracket (1) through a connecting frame, the input end of the self-unloading electromagnetic iron remover (493) is electrically connected to the output end of the single-chip computer (3), and the lower end of the self-unloading electromagnetic iron remover (493) is mounted in conjunction with the upper end of the vibrating screen (491).