Dry low intensity magnetic separator for mineral particle classification

Abstract

The application discloses a dry type weak magnetic field magnetic separator for grading and screening mineral particles and relates to the technical field of ore screening. The dry type weak magnetic field magnetic separator comprises a roller and a rolling shaft and further comprises a screening structure arranged on the roller and used for screening magnetic materials and non-magnetic materials. The screening mechanism comprises the rolling shaft which is arranged at the middle part of the roller, the inside of the rolling shaft is provided with a cavity, the middle part of the rolling shaft penetrates through a rotating column, the two ends of the rotating column are both provided with a vibrating assembly, the outer periphery of the roller is provided with an electromagnetic assembly, the outer side of the electromagnetic assembly is provided with a driving motor, the outer surface of the top of the rolling shaft is provided with a belt groove, and the middle part of the belt groove is rotatably connected with a rotating roller through a bearing. The electromagnetic assembly is electrified to form a magnetic field, magnetic materials are adsorbed, and materials without carrying a magnetic field will fall downward under the influence of gravity, so that the screening effect on ores is improved.

Description

Technical Field

[0001] This invention relates to the field of ore screening technology, specifically a dry weak magnetic field separator for mineral particle classification and screening. Background Technology

[0002] Magnetic separators are widely used in resource recycling, mining, kiln industry and other factories. They are suitable for wet magnetic separation of materials such as magnetite, pyrrhotite, roasted ore and ilmenite with a particle size of less than 3mm. They are also used for iron removal in coal, non-metallic minerals, building materials and other materials. They are one of the most widely used and versatile machines in the industry.

[0003] When mining some magnetic iron ores, it is necessary to separate the magnetic and non-magnetic materials in the ore. This requires the use of a magnetic separator. However, in the current magnetic separator technology, some magnetic materials may coat or adhere to the magnetic materials during the separation process. This causes some magnetic materials, along with non-magnetic materials, to be adsorbed onto the electromagnetic disk or related electromagnetic equipment, resulting in low purity of the ore after screening. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a dry weak magnetic field separator for mineral particle classification and screening.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a dry weak magnetic field separator for mineral particle grading and screening, comprising a drum and a grinding shaft, and further comprising:

[0006] The screening structure, which is set on the drum, is used to screen magnetic and non-magnetic materials;

[0007] The screening mechanism includes a crushing shaft located in the middle of a drum. The crushing shaft has a cavity inside, and a rotating column passes through the middle of the crushing shaft. Vibration components are installed at both ends of the rotating column. An electromagnetic component is installed on the outer periphery of the drum, and a drive motor is installed on the outside of the electromagnetic component. A belt groove is provided on the outer surface of the top of the crushing shaft. A rotating roller is rotatably connected to the middle of the belt groove through a bearing. A drive belt is connected between the belt groove and the output shaft of the drive motor.

[0008] As a preferred embodiment of the present invention, the vibration assembly includes two sets of centrifugal blocks and several sets of counterweights. The two sets of centrifugal blocks are respectively installed at both ends of the rotating column, and the counterweights are sleeved on the inner wall of the centrifugal blocks.

[0009] As a preferred embodiment of the present invention, the transmission belt includes transmission belt A, transmission belt B, and transmission belt C. Transmission belt A and transmission belt C are connected to the belt groove and the output shaft of the drive motor, and transmission belt B is connected to the rotating roller and the output shaft of the drive motor.

[0010] As a preferred embodiment of the present invention, there is a gap between the rolling shaft and the drum, and the upper edge of the rolling shaft is inclined downward at 30° toward the inner wall of the drum.

[0011] As a preferred embodiment of the present invention, the screening holes extend from the inner wall of the drum to the outer wall of the drum and are inclined upward at 60°.

[0012] As a preferred embodiment of the present invention, the center of the centrifugal block is offset to one side from the center of the rotating column, and the bottom end of the rotating column passes through the rolling shaft and extends into the inner cavity of the cavity.

[0013] As a preferred embodiment of the present invention, the electromagnetic component includes a protective shell and an electromagnetic coil. The protective shell is located on the outer periphery of the roller and has a gap between it and the roller. The electromagnetic coil is embedded inside the protective shell and is spiral in shape. When the electromagnetic coil is energized, it will form a magnetic field in the middle.

[0014] As a preferred embodiment of the present invention, the inner wall of the centrifugal block is made of magnet, the two sets of centrifugal blocks are symmetrical, and the counterweight is made of iron.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] I. This invention uses the operation of a drive motor to control the rotation of a transmission belt. Through the cooperation between the belt groove and the output shaft of the drive motor, the transmission belt drives the grinding shaft to rotate. When the grinding shaft rotates, it crushes the ore located between the grinding shaft and the drum, separating magnetic and non-magnetic materials. At this time, by energizing the electromagnetic component, a magnetic field is formed, which attracts the magnetic materials, while the materials without magnetic fields will fall downwards under the influence of gravity, thereby improving the screening effect of the ore.

[0017] Second, the present invention drives the centrifugal block to rotate by rotating the rotating column. When the centrifugal block rotates around the rotating column as the axis, centrifugal force will be generated. When the centrifugal force acts on the rotating column, the rotating column will cause the rolling shaft to vibrate. Through the vibration of the rolling shaft, since there is ore material between the rolling shaft and the drum, the rolling shaft will cause the drum to vibrate through the ore material, thereby vibrating out the ore material that is blocked inside the screening hole.

[0018] Third, this invention uses an upward-sloping sieve hole to allow non-magnetic materials to slide back onto the inner wall of the drum when they enter the sieve hole, while magnetic materials are attracted by the magnetic field and can pass through the sieve hole and exit outside the sieve hole. By disconnecting the magnetic field, the magnetic materials are detached, and the non-magnetic materials will fall out from the gap between the drum and the rolling shaft, while the magnetic materials will fall out from between the electromagnetic component and the drum, facilitating the separate discharge of the sieved materials.

[0019] Other advantages, objectives and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from the practice of the invention. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a cross-sectional view of the front of the present invention;

[0022] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A;

[0023] Figure 4 For the present invention Figure 2 Enlarged structural diagram at point B;

[0024] Figure 5 This is a schematic diagram of the disassembly structure of the roller of the present invention.

[0025] In the diagram: 1. Drum; 2. Screening hole; 3. Rolling shaft; 4. Belt groove; 5. Rotating roller; 6. Rotating column; 7. Vibration assembly; 71. Centrifugal block; 72. Counterweight; 8. Drive motor; 9. Transmission belt; 91. Transmission belt A; 92. Transmission belt B; 93. Transmission belt C; 10. Electromagnetic assembly; 101. Protective shell; 102. Electromagnetic coil; 11. Cavity. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] like Figure 1-5 As shown, the present invention provides a dry weak magnetic field separator for mineral particle grading and screening, including a drum 1 and a rolling shaft 3, and further comprising:

[0028] The screening structure is set on the drum 1 and is used to screen magnetic materials and non-magnetic materials.

[0029] The screening mechanism includes a crushing shaft 3, which is located in the middle of the drum 1. A cavity 11 is provided inside the crushing shaft 3. A rotating column 6 passes through the middle of the crushing shaft 3. Vibration components 7 are installed at both ends of the rotating column 6. An electromagnetic component 10 is provided on the outer periphery of the drum 1. A drive motor 8 is installed on the outside of the electromagnetic component 10. A belt groove 4 is provided on the outer surface of the top of the crushing shaft 3. A rotating roller 5 is rotatably connected to the middle of the belt groove 4 through a bearing. A transmission belt 9 is connected between the belt groove 4 and the output shaft of the drive motor 8.

[0030] The operation of the drive motor 8 will control the rotation of the transmission belt 9. At this time, through the cooperation between the belt groove 4 and the output shaft of the drive motor 8, the transmission belt 9 can drive the crushing shaft 3 to rotate. When the crushing shaft 3 rotates, it will crush and pulverize the ore located between the crushing shaft 3 and the drum 1. At this time, by energizing the electromagnetic component 10, a magnetic field is formed to attract magnetic materials, while materials without magnetic fields will fall downwards under the influence of gravity, thereby improving the screening effect of the ore.

[0031] like Figure 2 , 3 As shown, the vibration assembly 7 includes two sets of centrifugal blocks 71 and several sets of counterweights 72. The two sets of centrifugal blocks 71 are respectively installed at both ends of the rotating column 6, and the counterweights 72 are sleeved on the inner wall of the centrifugal blocks 71.

[0032] The weight of the centrifugal block 71 can be controlled by the design of the counterweight 72. At the same time, the rotation of the rotating column 6 will drive the centrifugal block 71 to rotate. When the centrifugal block 71 rotates around the rotating column 6 as the axis, centrifugal force will be generated. When the centrifugal force acts on the rotating column 6, the rotating column 6 will cause the rolling shaft 3 to vibrate. Through the vibration of the rolling shaft 3, since there is ore material between the rolling shaft 3 and the drum 1, the rolling shaft 3 will cause the drum 1 to vibrate through the ore material, thereby vibrating out the ore material that is blocked inside the screening hole 2.

[0033] like Figure 1 , 2 As shown in Figure 3, the transmission belt 9 includes transmission belt A91, transmission belt B92, and transmission belt C93. Transmission belt A91 and transmission belt C93 are connected to the belt groove 4 and the output shaft of the drive motor 8, and transmission belt B92 is connected to the rotating roller 5 and the output shaft of the drive motor 8.

[0034] The design of transmission belts A91, B92 and C93 enables the rotating column 6 and the rolling shaft 3 to rotate synchronously. The rotating column 6 can be affected by the centrifugal block 71, generating centrifugal force and vibrating. Thus, the vibration of the rotating column 6 can cause the vibration of the rolling shaft 3.

[0035] like Figure 2 As shown, there is a gap between the rolling shaft 3 and the drum 1, and the upper edge of the rolling shaft 3 is inclined downward at 30° toward the inner wall of the drum 1.

[0036] Because of the inclined shape of the top of the crushing shaft 3, the crushed stone falling on the top of the crushing shaft 3 will gradually move towards the gap between the roller 1 and the crushing shaft 3. Thus, the crushing shaft 3 and the roller 1 can break up and crush the ore, and the magnetic and non-magnetic materials can be separated by crushing and pulverizing the ore.

[0037] like Figure 4 As shown, the sieve hole 2 extends from the inner wall of the drum 1 to the outside of the drum 1 and is inclined upward at 60°.

[0038] Because of the upward tilt of the sieve hole 2, the non-magnetic material will not completely pass through the sieve hole 2 and separate from the roller 1 when it is squeezed. The non-magnetic material that enters the sieve hole 2 will slide down to the inner wall of the roller 1, while the magnetic material will be attracted by the magnetic field and thus pass through the sieve hole 2 and be discharged to the outside of the sieve hole 2. In this way, the magnetic and non-magnetic materials can be separated.

[0039] like Figure 2 , 3 As shown, the center of the centrifugal block 71 is offset to one side from the center of the rotating column 6, and the bottom end of the rotating column 6 passes through the rolling shaft 3 and extends into the inner cavity of the cavity 11.

[0040] By designing the centrifugal block 71, the rotating column 6 will vibrate due to the influence of centrifugal force when it rotates. At the same time, by designing the cavity 11, since the rotating column 6 extends into the cavity 11, the rotating column 6 has a certain amount of swaying space when it vibrates, thereby increasing the vibration intensity of the rotating column 6.

[0041] like Figure 2 As shown, the electromagnetic component 10 includes a protective shell 101 and an electromagnetic coil 102. The protective shell 101 is located on the outer periphery of the roller 1 and has a gap between it and the roller 1. The electromagnetic coil 102 is embedded inside the protective shell 101. The electromagnetic coil 102 is spiral in shape. When the electromagnetic coil 102 is energized, it will form a magnetic field in the middle.

[0042] The design of the electromagnetic coil 102 allows it to attract magnetic materials when energized, and to detach the magnetic materials when the energizer is de-energized, thus enabling the collection of the detached magnetic materials.

[0043] like Figure 2 , 3 As shown, the inner wall of the centrifugal block 71 is made of magnets, the two sets of centrifugal blocks 71 are symmetrical, and the counterweight 72 is made of iron.

[0044] By designing the centrifugal block 71, since the inner wall of the centrifugal block 71 is made of magnets, it can attract the counterweight 72. At the same time, by controlling the number of counterweights 72, the centrifugal force of the rotating column 6 can be controlled, thereby controlling the vibration intensity of the rotating column 6.

[0045] Working principle:

[0046] When the ore is first fed into the inner cavity of the drum 1, it will slide into the gap between the crushing shaft 3 and the drum 1. Then, the drive motor 8 is started, which controls the transmission belt 9 to rotate. At this time, through the cooperation between the belt groove 4 and the output shaft of the drive motor 8, the crushing shaft 3 and the rotating column 6 are driven to rotate by the transmission belt 9. When the crushing shaft 3 rotates, it will crush and pulverize the ore located between the crushing shaft 3 and the drum 1, separating the magnetic and non-magnetic materials. Then, by energizing the protective shell 101, a magnetic field is formed. At this time, the magnetic material will pass through and be attracted by the electromagnetic coil 102, while the material without a magnetic field will fall downward under the influence of gravity. At the same time, the rotation of the rotating column 6 will drive the centrifugal block 71 to rotate. When the centrifugal block 71 rotates around the rotating column 6 as the axis, it will crush and pulverize the ore between the crushing shaft 3 and the drum 1, separating the magnetic and non-magnetic materials. Centrifugal force will be generated. When the centrifugal force acts on the rotating column 6, the rotating column 6 will cause the rolling shaft 3 to vibrate. Through the vibration of the rolling shaft 3, since there is ore material between the rolling shaft 3 and the drum 1, the rolling shaft 3 will cause the drum 1 to vibrate through the ore material. This can vibrate out the ore material that is blocked inside the screening hole 2. When vibration sources are placed at both ends of an object, the vibration cannot be completely eliminated under normal circumstances. Instead, a kind of vibration balance effect is achieved. This balance can be understood as the forces of the two vibration sources canceling each other out or restraining each other, so that the overall vibration of the object is alleviated to a certain extent but cannot be completely eliminated. For example, in some mechanical structures, by setting symmetrical vibration sources at both ends, the amplitude of vibration can be reduced, but vibration may still exist.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dry weak magnetic field separator for mineral particle classification and screening, comprising a drum, characterized in that, Also includes: The screening structure, which is set on the drum, is used to screen magnetic and non-magnetic materials; The screening structure includes a crushing shaft located in the middle of a drum. The crushing shaft has a cavity inside, and a rotating column passes through the middle of the crushing shaft. Vibration components are installed at both ends of the rotating column. An electromagnetic component is installed on the outer periphery of the drum, and a drive motor is installed on the outside of the electromagnetic component. A belt groove is provided on the outer surface of the top of the crushing shaft. A rotating roller is rotatably connected to the middle of the belt groove through a bearing. A transmission belt is connected between the belt groove and the output shaft of the drive motor. There is a gap between the rolling shaft and the drum, and the upper edge of the rolling shaft is inclined downward at 30° toward the inner wall of the drum; The drum is provided with a sieving hole, which extends from the inner wall of the drum to the outside of the drum and is inclined upward at 60°. The electromagnetic component includes a protective shell and an electromagnetic coil. The protective shell is located on the outer periphery of the roller and has a gap between it and the roller. The electromagnetic coil is embedded inside the protective shell and is spiral in shape. When the electromagnetic coil is energized, it will form a magnetic field in the middle. The vibration assembly includes two sets of centrifugal blocks and several sets of counterweights. The two sets of centrifugal blocks are respectively installed at both ends of the rotating column, and the counterweights are sleeved on the inner wall of the centrifugal blocks. The transmission belt includes transmission belt A, transmission belt B, and transmission belt C. Transmission belt A and transmission belt C are connected to the belt groove and the output shaft of the drive motor, and transmission belt B is connected to the rotating roller and the output shaft of the drive motor.

2. The dry weak magnetic field separator for mineral particle classification and screening according to claim 1, characterized in that: The center of the centrifugal block is offset to one side from the center of the rotating column, and the bottom end of the rotating column passes through the rolling shaft and extends into the inner cavity of the cavity.

3. The dry weak magnetic field separator for mineral particle classification and screening according to claim 1, characterized in that: The inner wall of the centrifugal block is made of magnets, the two sets of centrifugal blocks are symmetrical, and the counterweight is made of iron.

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