A drum magnetic separator separation gap detection tool and detection method

Abstract

The application discloses a drum magnetic separator separation gap detection tool and a detection method. The detection tool comprises a disc base, a cylindrical sleeve fixed on the disc base, a cylindrical scale slidingly arranged in the cylindrical sleeve, and a height pointer fixed on the top of the cylindrical sleeve and matched with the cylindrical scale. A rotating shaft is arranged on the upper end of the cylindrical scale, an arc-shaped instrument panel is fixed on the rotating shaft, the rotating shaft is located at the upper center point of the arc-shaped instrument panel, and an angle pointer matched with the arc-shaped instrument panel is fixed on the cylindrical scale below the arc-shaped instrument panel. The tool can simply, conveniently, quickly and accurately measure the magnetic separator separation gap value, provides data support for accurately adjusting the magnetic separator separation gap, optimizes the equipment process performance, solves the problem that the separation gap size is not uniform along the axial direction, and thus avoids the problems of uneven ore slurry flow rate, ore sand deposition in the groove body at one end of the gap due to low ore slurry flow rate, and even blockage.

Description

Technical Field

[0001] This invention belongs to the field of mineral processing equipment technology, and specifically relates to a tool for detecting the separation gap of a drum magnetic separator. Background Technology

[0002] The drum magnetic separator is a typical example of a weak magnetic field separator. Its working principle is as follows: when strongly magnetic ore enters the drum magnetic separator, it forms magnetic chains or agglomerates under the influence of the magnetic field. As it moves from one magnetic pole to the next, the change in polarity causes the magnetic chains or agglomerates to undergo periodic loosening. The magnetic particles within the agglomerates or chains will rotate around their own axis as they move, and are also subjected to centrifugal force and fluid shear force. This process separates the mechanically entrained non-magnetic particles and some intergglomerates. The magnetic concentrate is carried to the concentrate discharge port by the rotating magnetic drum, and after leaving the magnetic system, it is discharged into the concentrate box by the concentrate washing water or the discharge scraper. The non-magnetic particles and some intergglomerates flow by gravity into the tailings discharge pipe under the action of the slurry flow within the tank. The separation gap of a drum magnetic separator refers to the distance between the bottom surface of the magnetic drum and the bottom plate of the bottom box. This gap is also the effective area of ​​the magnetic field. The separation process of the drum magnetic separator takes place within the separation gap. If the separation gap is too large or too small, it will affect the separation performance. If the gap is too large, the magnetic field force near the bottom plate is weak. Magnetic mineral particles or intergrowth particles in this area may flow into the tailings with the slurry due to insufficient magnetic force, resulting in an increase in tailings grade and a decrease in recovery rate. Conversely, if the gap is small, the recovery rate will be higher, but the concentrate grade will be lower. If the gap is too small, the flow rate of the slurry in the gap will be very fast, and some magnetic mineral particles will enter the tailings, reducing the recovery rate. In this case, if the amount of slurry fed is large, the tank will be full. Therefore, the size of the separation gap determines the quality of the magnetic separator's separation effect.

[0003] Measuring the separation gap of existing drum magnetic separators is extremely difficult due to the lack of dedicated measuring tools. Currently known methods for measuring the separation gap include: 1) disassembling the separator, placing a piece of clay near each end of the bottom plate of the tank, then reassembling the magnetic drum, compacting it, and then removing the drum. The thickness of the flattened clay is then measured, which is the working gap value; 2) using a coarse method, opening the ore discharge holes at both ends of the magnetic separator tank and feeling the gap to obtain a rough value. Neither of these methods is an effective way to accurately measure the separation gap of a drum magnetic separator. Summary of the Invention

[0004] The purpose of this invention is to provide a tool for detecting the separation gap of a drum magnetic separator, which can simply, conveniently, quickly and accurately measure the separation gap value of the magnetic separator, providing data support for the precise adjustment of the separation gap of the magnetic separator.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A tool for detecting the separation gap of a cylindrical magnetic separator includes a disc base, a cylindrical sleeve fixed on the disc base, a cylindrical scale slidably disposed inside the cylindrical sleeve, and a height pointer that cooperates with the cylindrical scale fixed on the top of the cylindrical sleeve; a rotating shaft is disposed at the upper end of the cylindrical scale, an arc-shaped instrument panel is fixed on the rotating shaft and the rotating shaft is located at the upper center point of the arc-shaped instrument panel, and an angle pointer that cooperates with the arc-shaped instrument panel is fixed on the cylindrical scale below the arc-shaped instrument panel.

[0007] The cylindrical sleeve has a threaded connection on its side with a fixed knob that restricts the sliding of the cylindrical scale.

[0008] The arc-shaped instrument panel is threaded with an adjustment knob that limits the rotation of the arc-shaped instrument panel.

[0009] Another objective of this invention is to provide a method for detecting the separation gap in a drum magnetic separator, specifically comprising the following steps:

[0010] 1) Send the above-mentioned testing tools into the bottom box through the discharge port at the bottom of the drum magnetic separator;

[0011] 2) Loosen the adjustment knob and the fixing knob until the arc-shaped instrument panel is tightly fitted to the surface of the magnetic drum of the drum magnetic separator, and the disc base is tightly fitted to the base box. Then tighten the adjustment knob and the fixing knob, and read the value α on the arc-shaped instrument panel and the value A on the cylindrical scale.

[0012] 3) Calculate the separation gap L between the magnetic drum and the bottom plate of the drum magnetic separator. The calculation formula is as follows:

[0013] L=AdD×sin 2 α / 2

[0014] In the formula: L—size of the sorting gap,

[0015] A—The vertical distance from the base of the disc to the surface of the magnetic roller.

[0016] d – The vertical distance from the bottom plate of the magnetic separator's bottom box to the bottom box itself. For magnetic separators of the same model, the value of d is a fixed constant.

[0017] D—Outer diameter of the magnetic drum of the magnetic separator

[0018] α — Angle value on the curved instrument panel.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The appropriate value of the separation gap of the drum magnetic separator depends on the specific production conditions and is generally adjusted between 30 and 60 mm. Due to the small separation gap, the accuracy of the measurement data is required to be high. This invention can measure the separation gap value of the magnetic separator simply, conveniently, quickly and accurately, providing data support for the precise adjustment of the separation gap, optimizing the equipment process performance, and solving the problem of uneven separation gap size along the axial direction. This avoids the problem of ore sand deposition or even blockage in the tank at the end with a large gap due to the low ore flow rate caused by uneven slurry flow rate. Attached Figure Description

[0021] Figure 1 This is a front perspective view of the overall structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the overall structure of the present invention, AA side.

[0023] Figure 3 This is a rotating view of the center of the arc-shaped instrument panel of the present invention.

[0024] Figure 4 This is a diagram showing the vertical displacement of the cylindrical scale of the present invention.

[0025] Figure 5 This is a schematic diagram illustrating the application of the present invention.

[0026] Figure 6 This is a schematic diagram illustrating the measurement principle of the present invention.

[0027] In the diagram: 1-arc-shaped instrument panel, 2-rotating shaft, 3-adjustment knob, 4-angle pointer, 5-fixed knob, 6-cylindrical scale, 7-cylindrical sleeve, 8-disc base, 9-height pointer, 10-magnetic roller, 11-bottom box, 12-bottom box base plate, 13-ore outlet. Detailed Implementation

[0028] like Figure 1 , 2 As shown in Figure 3, a separation gap detection tool for a cylindrical magnetic separator includes a disc base 8, a cylindrical sleeve 7 fixed on the disc base 8, a cylindrical scale 6 slidably disposed inside the cylindrical sleeve 7, and a height pointer 9 fixed on the top of the cylindrical sleeve 7 to cooperate with the cylindrical scale 6. A fixing knob 5 for limiting the sliding of the cylindrical scale 6 is threadedly connected to the side of the cylindrical sleeve 7. A rotating shaft 2 is disposed at the upper end of the cylindrical scale 6, and an arc-shaped instrument panel 1 is fixed on the rotating shaft 2, with the rotating shaft 2 located at the upper center point of the arc-shaped instrument panel 1. An adjustment knob 3 for limiting the rotation of the arc-shaped instrument panel 1 is also threadedly connected to the arc-shaped instrument panel 1. An angle pointer 4 for cooperating with the arc-shaped instrument panel 1 is fixed on the cylindrical scale 6 below the arc-shaped instrument panel 1.

[0029] The curvature of the arc-shaped instrument panel 1 is determined according to the outer diameter of the magnetic drum of different models of drum magnetic separators. The curvature is 0.44Π and the arc length is 0.44Π*r, where r is the radius of the magnetic drum. There is an angle scale at the bottom of the arc-shaped instrument panel, and the angle values ​​of the angle scale are calibrated symmetrically at the center.

[0030] like Figure 2 As shown, when the arc-shaped instrument panel 1 is rotated to a certain angle, the angle value can be read by the angle pointer 4 after the adjustment knob 3 is rotated to lock it. At this time, the adjustment knob 3 is pressed against the cylindrical scale 6.

[0031] like Figure 1 and 4 As shown, the cylindrical scale 6 has a vertical displacement scale at the bottom. The cylindrical scale 6 and the cylindrical sleeve 7 are assembled together. The inner diameter of the cylindrical sleeve 7 is slightly larger than the outer diameter of the cylindrical scale 6, which facilitates the vertical movement of the cylindrical scale 6 inside the cylindrical sleeve 7. When the cylindrical scale 6 is adjusted to a certain height, it is locked by rotating the fixing knob 5. The vertical displacement value is read by the height pointer 9 fixed on the cylindrical sleeve 7.

[0032] The following is combined Figure 5 The detection method for the separation gap detection tool of the above-mentioned drum magnetic separator is described in detail, including the following steps:

[0033] 1) Send the above-mentioned testing tools into the bottom box 11 through the discharge port 13 at the bottom of the drum magnetic separator;

[0034] 2) Loosen the adjustment knob 3 and the fixing knob 5. After the arc-shaped instrument panel 1 is tightly attached to the surface of the magnetic drum 10 of the drum magnetic separator, and the disc base 8 is tightly attached to the base box 11, tighten the adjustment knob 3 and the fixing knob 5. Read the value α of the arc-shaped instrument panel 1 and the value A of the cylindrical scale 6.

[0035] 3) Calculate the separation gap L between the magnetic drum 10 and the bottom plate 12 of the drum magnetic separator. The calculation formula is as follows:

[0036] L=AdD×sin 2 (α / 2)

[0037] Where: L — sorting gap size

[0038] A – Vertical distance from the base of the disc to the surface of the magnetic roller

[0039] d—The vertical distance from the bottom plate of the magnetic separator's bottom box to the bottom box itself. For magnetic separators of the same model, the d value is a fixed constant.

[0040] D—Outer diameter of the magnetic drum of the magnetic separator

[0041] α — Angle value on the curved instrument panel.

[0042] The specific derivation process is as follows:

[0043] Given the outer diameter D of the magnetic roller of the magnetic separator, the vertical distance A from the disc base to the surface of the magnetic roller, and the angle value α on the arc-shaped instrument panel.

[0044] Depend on Figure 6 We know that ∠α=∠β, ∠γ=∠δ=1 / 2∠β, A=d+L+M, M=D / 2-D / 2×cosβ.

[0045] Then we have L = AdM = Ad - (D / 2 - D / 2 × cosβ) = AdD / 2(1 - cosβ);

[0046] From the trigonometric function: 1 - cosβ = 2sin 2 From (β / 2), we know that L = AdD / 2 × 2sin 2 (β / 2) = AdD × sin 2 (β / 2) = AdD × sin 2 (α / 2).

Claims

1. A tool for detecting the separation gap of a drum magnetic separator, characterized in that: The device includes a disc base (8), on which a cylindrical sleeve (7) is fixed. A cylindrical scale (6) is slidably arranged inside the cylindrical sleeve (7), and a height pointer (9) that cooperates with the cylindrical scale (6) is fixed at the top of the cylindrical sleeve (7). A rotating shaft (2) is provided at the upper end of the cylindrical scale (6), and an arc-shaped instrument panel (1) is fixed on the rotating shaft (2). The rotating shaft (2) is located at the upper center point of the arc-shaped instrument panel (1). An angle pointer (4) that cooperates with the arc-shaped instrument panel (1) is fixed on the cylindrical scale (6) below the arc-shaped instrument panel (1). During testing, the arc-shaped instrument panel (1) is in close contact with the surface of the magnetic drum (10) of the drum magnetic separator, and the disc base (8) is in close contact with the bottom box (11) of the drum magnetic separator.

2. The separation gap detection tool for a drum magnetic separator as described in claim 1, characterized in that: The cylindrical sleeve (7) has a threaded connection on its side with a fixed knob (5) that restricts the sliding of the cylindrical scale (6).

3. The separation gap detection tool for a drum magnetic separator as described in claim 2, characterized in that: The arc-shaped instrument panel (1) is threaded with an adjustment knob (3) that restricts the rotation of the arc-shaped instrument panel (1).

4. A method for detecting the separation gap of a drum magnetic separator, characterized in that, The detection is performed using the detection tool described in claim 3, and the specific steps are as follows: 1) Send the above-mentioned testing tools into the bottom box (11) through the discharge port (13) at the bottom of the drum magnetic separator; 2) Loosen the adjustment knob (3) and the fixing knob (5). After the arc-shaped instrument panel (1) is tightly attached to the surface of the magnetic drum (10) of the drum magnetic separator, and the disc base (8) is tightly attached to the base box (11), tighten the adjustment knob (3) and the fixing knob (5), and read the value α of the arc-shaped instrument panel (1) and the value A of the cylindrical scale (6). 3) Calculate the separation gap L between the magnetic drum (10) of the drum magnetic separator and the bottom plate (12) of the bottom box. The calculation formula is as follows: L=AdD×sin 2 a / 2 Where: L — sorting gap size A – Vertical distance from the base of the disc to the surface of the magnetic roller d—the vertical distance from the bottom plate of the magnetic separator's bottom box to the bottom box itself. For magnetic separators of the same model, the d value is a fixed constant. D—Outer diameter of the magnetic drum of the magnetic separator α — Angle value on the curved instrument panel.

Images