A large-scale electromagnetic elutriator

Abstract

The present invention discloses a large electromagnetic washing machine, which belongs to the technical field of mineral selection equipment, including a vertically arranged sorting drum, wherein a plurality of excitation coils are sleeved on the outside of the sorting drum from top to bottom, and adjacent excitation coils are arranged at intervals; a control system, wherein the control system can control all the excitation coils to be cyclically powered on and off in an orderly manner, wherein within a time period, the excitation coil between every two excitation coils is powered off, while the two adjacent excitation coils on both sides of the powered-off excitation coil are powered on, and after each time period, the next adjacent excitation coil along the axis of the sorting drum is powered off, and the two adjacent excitation coils on both sides of the corresponding powered-off excitation coil are powered on, until all the excitation coils are powered off and the cycle repeats again. The above structure can effectively solve the magnetic attenuation phenomenon that occurs when the diameter of the sorting drum increases by integrally controlling all the excitation coils and cyclically powering on and off, and is suitable for large-scale washing machines.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral concentration equipment, in particular to a large electromagnetic elutriator. Background Art

[0002] In order to realize the large-scale of the elutriation machine and improve the equipment processing capacity and production efficiency, the diameter of the separation drum must be increased. As the diameter of the separation drum increases, the magnetic field distribution inside the separation drum will change accordingly, and excessive magnetic attenuation will occur around the axis of the separation drum, and even magnetic voids will appear. Figure 7 As shown in the figure, this phenomenon will make the magnetic field strength around the axis of the separation drum fail to meet the mineral separation requirements, which will seriously affect the mineral separation, resulting in incomplete mineral separation and greatly reduced processing capacity.

[0003] Currently, electromagnetic washing machines are mostly divided into three types of excitation coils according to the requirements of mineral processing, namely tail control coil, circulation coil and compensation coil.

[0004] The magnetic field generated by the tail coil excitation is primarily used to control tailing, preventing magnetic iron overflow and the overflow ratio of rich-poor and rich-poor conjoined bodies. The magnetic field generated by the circulating coil excitation is the sorting magnetic field, primarily controlling the length and downward speed of the magnetic flux to control the concentrate grade. The magnetic field generated by the compensation coil excitation primarily forms a uniform downward background magnetic field to prevent magnetic flux aggregation and the formation of a central "magnetic void." This method of distinguishing and controlling the sorting coils is relatively cumbersome and complex in terms of equipment manufacturing, wiring, and control, and also increases the professional skills required of manufacturing, installation, and on-site operation personnel.

[0005] In view of the above problems, the present invention designs and manufactures a large electromagnetic washing machine to overcome the above defects. Summary of the Invention

[0006] In order to solve the problems existing in the prior art, the present invention provides a large electromagnetic washing machine, which can effectively solve the magnetic attenuation phenomenon that occurs when the diameter of the sorting drum increases by integrated control of all excitation coils and orderly cycle on and off the power, and is suitable for large-scale washing machines.

[0007] To achieve the above object, the present invention adopts the following technical solution: a large electromagnetic elutriator, comprising a vertically arranged sorting drum, wherein a plurality of excitation coils are sleeved on the outside of the sorting drum from top to bottom, and adjacent excitation coils are arranged at intervals;

[0008] A control system is provided, which can control all the excitation coils to be energized and deenergized in an orderly cycle. Within a time period, the excitation coil between every two excitation coils is deenergized, while the two adjacent excitation coils on both sides of the deenergized excitation coil are energized. After each time period, the next adjacent excitation coil along the axis of the sorting drum is deenergized, and the two adjacent excitation coils on both sides of the corresponding deenergized excitation coil are energized, until all the excitation coils are deenergized and the cycle repeats again.

[0009] Preferably, an overflow assembly is provided on the top of the separation cylinder, a feeding assembly is stacked on the overflow assembly, the lower end of the feeding assembly extends into the separation cylinder, and the minerals are scattered into the separation cylinder in a high-pressure state through the feeding assembly;

[0010] The bottom of the separation drum is provided with a concentrate discharge port, and the side of the separation drum is connected with a water inlet pipe.

[0011] Preferably, the overflow assembly is provided with a tailings concentration meter;

[0012] A concentrate concentration meter is provided near the concentrate discharge outlet.

[0013] Preferably, an excitation coil is provided outside the separation drum and below the water inlet pipe;

[0014] The other excitation coils are arranged above the water inlet pipe.

[0015] Preferably, adjacent excitation coils are spaced apart by a positioning assembly.

[0016] Preferably, the excitation coil is wound by alloy electromagnetic wire.

[0017] Preferably, the number of the excitation coils is at least 5.

[0018] Preferably, the inner diameter of the sorting cylinder is not less than 2.2 m.

[0019] Preferably, an outer cylinder is provided on the outside of the sorting cylinder, and the excitation coil is located between the outer cylinder and the sorting cylinder.

[0020] Preferably, the control system is configured as a PLC.

[0021] The invention is beneficial in that:

[0022] 1. In the present invention, two adjacent excitation coils on both sides of the de-energized excitation coil are energized during each time period. The two adjacent energized excitation coils can be used to superimpose the magnetic fields, effectively increasing the magnetic field strength and depth in the separation drum, reducing the magnetic attenuation phenomenon around the axis of the separation drum, preventing the occurrence of magnetic voids, ensuring that the minerals entering the separation drum are fully sorted, and making it possible to scale up the washing machine.

[0023] 2. This invention no longer separates each excitation coil into a tail coil, a circulating coil, and a compensation coil. Instead, all excitation coils are controlled in an integrated manner, simplifying control, operation, and maintenance. Furthermore, all excitation coils are energized and de-energized in an orderly fashion, allowing them to function as traditional circulating coils in controlling concentrate grade. This increases the number of tumbling times within the separation drum, resulting in a more pronounced "eluviation" effect and more precise control of concentrate grade.

[0024] 3. In each control cycle, the two excitation coils at the top of the sorting drum will be in a cyclic on-off state. Therefore, in addition to the separation and selection of minerals by traditional circulating coils, the two excitation coils at the top also play the role of pulsating magnetic field tail control because the two excitation coils at the top have no power-off gap, and also play a buffering and stabilizing role on overflow, thereby maintaining the stability of the liquid level and eliminating intermittent fluctuations of the liquid level.

[0025] 4. In each control cycle, the excitation coil at the bottom of the sorting drum of the present invention is in the energized state for a longer time than the de-energized state. Since the excitation coil at the bottom is in the energized state for a longer time, it will play a certain function similar to the "compensation coil" of a traditional washing machine.

[0026] 5. If the two bottom excitation coils are considered as a whole, during operation, if one of the two bottom excitation coils is de-energized, the other will be energized. Since at least one coil is always energized, a "compensation coil" similar to that of a traditional elutriator appears at the bottom of the electromagnetic elutriator's separation drum, providing a "magnetic void prevention" function. In other words, the two bottom excitation coils not only perform the mineral separation and selection functions of traditional circulating coils, but also have the "magnetic void prevention" function of the traditional elutriator's compensation coil.

[0027] 6. In each control cycle, the two excitation coils at the bottom will be energized at the same time for a period of time. The superposition of the magnetic fields generated by the two excitation coils further enhances the effect of preventing the occurrence of the "magnetic void" phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of a large electromagnetic elutriator;

[0029] Figure 2 This is a schematic diagram of the magnetic lines of force of two adjacent excitation coils of a large electromagnetic elutriator;

[0030] Figure 3 This is a schematic diagram of the energization rules of the eight excitation coils of the present invention;

[0031] Figure 4 This is a schematic diagram of the energization pattern of the two top excitation coils of the present invention;

[0032] Figure 5 This is a schematic diagram of the energizing rule of the bottom excitation coil of the present invention;

[0033] Figure 6 This is a schematic diagram of the energization rules of the two lower excitation coils of the present invention;

[0034] Figure 7 Schematic diagram of the magnetic lines of force of a single excitation coil of a large electromagnetic washing machine.

[0035] In the figure: 1. Sorting drum; 2. Excitation coil; 3. Outer drum; 4. Water inlet pipe; 5. Concentrate discharge outlet; 6. Feed assembly; 7. Overflow assembly; 8. Tailings concentration meter; 9. Concentrate concentration meter. DETAILED DESCRIPTION

[0036] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0037] like Figure 1 As shown, a large electromagnetic washing machine includes a vertically arranged sorting drum 1, the inner diameter of the sorting drum 1 is not less than 2.2m, a plurality of excitation coils 2 are sleeved on the outside of the sorting drum 1 from top to bottom, an outer drum 3 is sleeved on the outside of the sorting drum 1, and the excitation coil 2 is located between the outer drum 3 and the sorting drum 1.

[0038] The excitation coil 2 is wound by alloy electromagnetic wire. Adjacent excitation coils 2 are spaced apart by positioning components. There are at least 5 excitation coils 2. In this embodiment, the number of excitation coils 2 is introduced as 8. The specific excitation coils 2 are set as X1, X2...X7, X8 from top to bottom.

[0039] An overflow assembly 7 is provided at the top of the separation drum 1. The overflow assembly 7 is preferably configured as an overflow. A feed assembly 6 is stacked on the overflow assembly 7. The feed assembly 6 is preferably configured as a feed drum. The lower end of the feed assembly 6 extends into the separation drum 1. Minerals are scattered into the separation drum 1 at high pressure through the feed assembly 6. A concentrate discharge port 5 is provided at the bottom of the separation drum 1. A water inlet pipe 4 is connected to the side of the separation drum 1. Flushing water enters the separation drum 1 through the water inlet pipe 4. The separated magnetic materials can be discharged from the concentrate discharge port 5 at the bottom of the separation drum 1, while the tailings are discharged from the separation drum 1 through the overflow assembly 7.

[0040] It also includes a control system, which is preferably set to PLC. The control system can control all the excitation coils 2 to cycle on and off in an orderly manner, forming intermittent strong magnetic field areas and weak magnetic field areas in the sorting drum 1. The intermittent strong magnetic field and weak magnetic field respectively have the effect of adsorbing and discarding the minerals, repeatedly "washing" the minerals. Under the joint action of flushing water, the magnetic materials agglomerate and disperse in the water, and the non-magnetic impurities wrapped in the minerals are gradually removed to form magnetic agglomerates. In the sinking process of the magnetic agglomerates, they are constantly agglomerated, dispersed, and agglomerated, so that the non-magnetic impurities wrapped inside them become less and less, and eventually become concentrate and flow out from the concentrate discharge port 5. The non-magnetic impurities rise and overflow under the action of the rising flushing water flow, thereby realizing the washing of the minerals and completing the mineral processing function.

[0041] To achieve the above function, the following control method is used: within a time period, the excitation coil 2 between every two excitation coils 2 is de-energized, while the two adjacent excitation coils 2 on both sides of the de-energized excitation coil 2 are energized. After each time period, the next adjacent excitation coil 2 along the axis of the sorting drum 1 is de-energized, and the two adjacent excitation coils 2 on both sides of the corresponding de-energized excitation coil 2 are energized, and the cycle repeats until all excitation coils 2 are de-energized, that is, no two adjacent excitation coils 2 are de-energized at the same time.

[0042] Specifically, the number of excitation coils 2 is 8, for example. Figure 3 As shown, the power on and off sequence and rules are as follows:

[0043] During time 1T, excitation coils X1 and X2 are energized simultaneously, while the adjacent excitation coil X3 is de-energized. The excitation coils X4 and X5 below them are energized simultaneously, while excitation coil X6 is de-energized. Excitation coils X7 and X8 are energized simultaneously. During time 2T, excitation coil X1 is de-energized, while the adjacent excitation coils X2 and X3 are energized. The excitation coil X4 below them is de-energized. Excitation coils X5 and X6 are energized, while excitation coil X7 is de-energized. Excitation coil X8 is energized. During time 3T, excitation coil X1 is energized, while excitation coil X2 is de-energized. Excitation coils X3 and X4 are energized, while the excitation coil X5 below them is de-energized, while the adjacent excitation coils X6 and X7 are energized. Excitation coil X8 is de-energized. This completes a full control cycle, which then repeats itself.

[0044] In each time period of the present invention, two adjacent excitation coils 2 on both sides of the de-energized excitation coil 2 are energized, and the magnetic fields can be superimposed by means of the two adjacent energized excitation coils 2, such as Figure 2 As shown, the magnetic field strength and depth in the separation drum 1 are effectively improved, the magnetic attenuation phenomenon around the axis of the separation drum 1 is reduced, the occurrence of magnetic voids is prevented, and the minerals entering the separation drum 1 are ensured to be fully sorted, making it possible to scale up the washing machine.

[0045] Since each excitation coil 2 is no longer divided into a tail control coil, a circulation coil, and a compensation coil, all the excitation coils 2 are controlled in an integrated manner, which makes control, operation, and maintenance simple. Moreover, all the excitation coils 2 are energized and de-energized in an orderly manner, so that all the excitation coils 2 play the role of controlling the concentrate grade of the traditional circulation coils. This increases the number of tumbling times of the mineral in the separation drum 1, the "elution" effect is more significant, and the control of the concentrate grade is more precise.

[0046] Although the present invention does not have a tail control coil, the two excitation coils 2 at the top of the separation drum 1 can also play the role of pulsating magnetic field tail control. Figure 4 As shown, during each control cycle, the excitation coils X1 and X2 are cyclically powered on and off. Since there is no power-off interval between the excitation coils X1 and X2, they can function as a pulsating magnetic field to control the tailings. After the magnetic field of the excitation coil X1 has attracted a certain amount of ferromagnetic minerals, it will be de-energized, allowing the already chained ferromagnetic minerals adsorbed on the excitation coil X1 to fall as the magnetic field weakens. At this point, the ferromagnetic mineral chains on the excitation coil X1 are of moderate size, effectively preventing excessive chaining near the excitation coil X1. This allows the ferromagnetic minerals to enter the sorting area for effective sorting, eliminating the phenomenon of ore escape, thereby effectively reducing the magnetic iron content and grade of the tailings. The regular on-off switching of the two excitation coils X1 and X2 can effectively reduce the discharge of magnetic iron in the tailings. It also acts as a buffer and stabilizes overflow, thereby maintaining a stable liquid level and eliminating intermittent fluctuations in the liquid level. Furthermore, the two topmost excitation coils 2 perform the same mineral sorting and selection functions as traditional circulating coils.

[0047] Although the present invention does not have a compensation coil, the excitation coil 2 or two adjacent excitation coils 2 at the bottom of the separation drum 1 have the effect of a traditional compensation coil and can eliminate the "magnetic void" phenomenon at the bottom. Specifically, the excitation coil X8 at the bottom of the separation drum 1 of the present invention is in each control cycle, such as Figure 5 As shown, the time in the power-on state is longer than the time in the power-off state. Since the bottom excitation coil 2 is in the power-on state for a longer time, it will play a certain function similar to the "compensation coil" of a traditional washing machine.

[0048] If we consider the two excitation coils X7 and X8 at the bottom as a whole, Figure 6As shown, during the operation of the excitation coils 2, at least one of the two bottom excitation coils X7 and X8 remains energized. This creates a "compensation coil" similar to that of a traditional elutriator at the bottom of the electromagnetic elutriator's separation drum 1, effectively preventing "magnetic voids." In other words, the two bottom excitation coils 2 not only perform the mineral separation and selection functions of traditional circulating coils, but also provide the same "magnetic void prevention" function as the compensation coils of traditional elutriators.

[0049] In each control cycle, the two excitation coils X7 and X8 at the bottom will be energized at the same time for a period of time. The superposition of the magnetic fields generated by the two excitation coils X7 and X8 further enhances the effect of preventing the occurrence of the "magnetic void" phenomenon.

[0050] The overflow assembly 7 of the present invention is equipped with a tailings concentration meter 8, and a concentrate concentration meter 9 is located near the concentrate outlet 5. The detection signal from the tailings concentration meter 8 is fed back to the control system and compared with the set concentration value, enabling real-time control of the magnetic field strength of the excitation coil 2. The detection signal from the concentrate concentration meter 9 is fed back to the control system and compared with the set concentration value, enabling real-time control of the concentrate outlet 5. Ultimately, in the control system, by setting target values for the tailings and concentrate concentrations, the control system uses a PID control algorithm to control the magnetic field force and the opening of the concentrate outlet 5, maintaining the target values within a certain operating range.

[0051] An excitation coil 2 is provided outside the separation drum 1 and below the water inlet pipe 4 to ensure that the lowest excitation coil 2 can help transport the selected minerals; other excitation coils 2 are arranged above the water inlet pipe 4 to ensure repeated "elution" of the minerals.

[0052] It should be understood that the purpose of these embodiments is only to illustrate the present invention and is not intended to limit the scope of protection of the present invention. In addition, it should also be understood that after reading the technical content of the present invention, those skilled in the art may make various changes, modifications and / or variations to the present invention, and all of these equivalent forms also fall within the scope of protection defined by the claims appended hereto.

Claims

1. A large electromagnetic elutriator, characterized in that: It comprises a vertically arranged sorting drum (1), wherein a plurality of excitation coils (2) are sleeved on the outside of the sorting drum (1) from top to bottom, and adjacent excitation coils (2) are arranged at intervals; A control system is provided, wherein the control system can control all the excitation coils (2) to be energized in an orderly cycle. Within a time period, the excitation coil (2) between every two excitation coils (2) is de-energized, while the two excitation coils (2) adjacent to the de-energized excitation coil (2) on both sides are energized. After each time period, the next adjacent excitation coil (2) along the axis direction of the sorting drum (1) is de-energized, and the two excitation coils (2) adjacent to the de-energized excitation coil (2) on both sides are energized, and the cycle repeats until all the excitation coils (2) are de-energized.

2. A large electromagnetic elutriator according to claim 1, characterized in that: An overflow assembly (7) is provided on the top of the separation barrel (1), a feeding assembly (6) is stacked on the overflow assembly (7), and the lower end of the feeding assembly (6) extends into the separation barrel (1), and minerals are scattered into the separation barrel (1) in a high-pressure state through the feeding assembly (6); A concentrate discharge port (5) is provided at the bottom of the separation drum (1), and a water inlet pipe (4) is connected to the side of the separation drum (1).

3. A large electromagnetic elutriator according to claim 2, characterized in that: An excitation coil (2) is provided outside the separation drum (1) and below the water inlet pipe (4); The other excitation coils (2) are arranged above the water inlet pipe (4).

4. A large electromagnetic elutriator according to claim 2, characterized in that: The overflow assembly (7) is provided with a tailings concentration meter (8); A concentrate concentration meter (9) is provided near the concentrate discharge outlet (5).

5. A large electromagnetic elutriator according to claim 1, characterized in that: Adjacent excitation coils (2) are spaced apart by positioning components.

6. A large electromagnetic elutriator according to claim 1, characterized in that: The excitation coil (2) is wound from alloy electromagnetic wire.

7. A large electromagnetic elutriator according to claim 1, characterized in that: The number of the excitation coils (2) is at least 5.

8. A large electromagnetic elutriator according to claim 1, characterized in that: The inner diameter of the separation cylinder (1) is not less than 2.2 m.

9. A large electromagnetic elutriator according to claim 1, characterized in that: The outer portion of the separation cylinder (1) is provided with an outer cylinder (3), and the excitation coil (2) is located between the outer cylinder (3) and the separation cylinder (1).

10. A large electromagnetic elutriator according to claim 1, characterized in that: The control system is set as PLC.

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