A simple device for detecting the grade of magnetite

Abstract

This utility model belongs to the field of mineral testing technology, specifically disclosing a simple magnetite grade testing device, including a plastic shell, a small plastic box, a permanent magnet, a spring, a connecting rod, and a scale. The small plastic box is fixed to the bottom of the shell by a threaded connection, and its side wall has volume scale lines and is made of transparent material, which facilitates observation of the sample filling status and quantitative sample loading. The permanent magnet is a disc-shaped neodymium iron boron magnet, which is connected to the free end of the spring through the connecting rod. The other end of the spring is fixed to the top of the shell, allowing the permanent magnet to slide along the shell as the magnetic force changes. The scale is vertically fixed inside the shell, and a pointer is provided at the end of the connecting rod. The pointer displacement corresponds to the linear scale value of the scale. This device converts magnetic force into intuitive displacement through mechanical linkage, and eliminates empirical errors by combining linear calibration. It has the characteristics of simple structure, quick operation, and low cost, and is suitable for rapid screening of magnetite grade in mines.

Description

Technical Field

[0001] This utility model relates to the field of mineral testing technology, specifically to a simple magnetite grade testing device. Background Technology

[0002] Magnetite grade directly determines resource utilization efficiency and enterprise economic benefits. Traditional testing methods require sending ore samples to a laboratory for chemical composition analysis, a time-consuming process that cannot meet the needs of real-time on-site assessment. Especially in ore-bearing areas with complex rock formations and diverse associated minerals, the grade of mined ore fluctuates significantly. On-site personnel often rely on manual experience to determine ore placement, which is prone to misjudgment due to differences in experience or interference from mineral composition. This leads to the mixing of high-grade ore with low-grade ore, severely impacting beneficiation efficiency and cost control. Existing portable testing methods are mostly limited to single magnetic tests, making it difficult to quantify the grade parameters of ores with complex compositions. There is an urgent need to develop a simple-to-operate, intuitive testing device to achieve rapid on-site grading and precise management.

[0003] Patent CN208239345U discloses a magnetite grade detection device, comprising a PVC pipe with a portable handle at the rear. An electromagnet probe and a fixing plate are installed inside the PVC pipe, with the fixing plate and electromagnet probe fixedly connected by a spring. A potentiometer is installed inside the PVC pipe. A microcomputer and a power supply are installed inside the portable handle, with a power switch on one side of the handle and an LED display screen on the rear. This invention has a simple structure and is easy to assemble. When the displayed data value is lower than the boundary grade value, it is classified as inclusion stone, allowing for timely modification of geological maps and notification to on-site miners to remove it, preventing ore dilution. Furthermore, this device is portable and can be carried with you, unaffected by on-site conditions.

[0004] The above-mentioned solution uses a microcomputer and LED display to analyze and detect the grade of magnetite, which is complex in structure and the electronic equipment is subject to interference from magnetite. Utility Model Content

[0005] The purpose of this utility model is to provide a simple magnetite grade detection device to solve the problem that existing magnetite grade detection devices are complex in structure and inconvenient for use in mines.

[0006] To achieve the above objectives, the basic solution provided by this utility model is as follows: a simple magnetite grade detection device, comprising a plastic shell, a permanent magnet, and a spring. The small plastic box is threadedly connected to the bottom of the plastic shell, the spring is fixedly connected to the top of the plastic shell, the permanent magnet is fixedly connected to a connecting rod, the connecting rod passes through the bottom of the small plastic box, the connecting rod is fixedly connected to the free end of the spring, the connecting rod is slidably connected to the plastic shell, the permanent magnet is located directly below the small plastic box, the plastic shell is provided with a scale, and a pointer is fixedly connected to the connecting rod.

[0007] The principle and beneficial effects of this invention are as follows: the device is designed based on the strong magnetic characteristics of magnetite. When a small plastic box containing the ore sample is placed directly above the permanent magnet assembly, the magnetic field generated by the magnet attracts the magnetic minerals in the sample. The attraction force is transmitted to the spring through the permanent magnet, causing the spring to compress. The spring's extension or contraction moves the pointer of the scale via a mechanical linkage. The scale graduation is pre-determined through calibration using samples of known grades. For example, during calibration, if a 40% grade sample is inserted and the spring compression is 5mm, the corresponding graduation is "40%". During testing, the graduation indicated by the pointer is the magnetite grade of the ore.

[0008] Option 2, a preferred option of the basic scheme, involves a transparent plastic box with volume markings on its side. The transparency allows the operator to observe the sample filling status, while the volume markings ensure consistent sample volume each time. Quantitative sample loading eliminates magnetic differences caused by sample volume fluctuations, improving the consistency of calibration and detection, and reducing human error.

[0009] Option 3, a preferred option of the basic option, uses a sheet-like neodymium iron boron magnet as the permanent magnet 3. Neodymium iron boron magnets have a high magnetic energy product, ≥0.5 T, which can generate a strong magnetic field in a small volume, ensuring that they can still effectively attract magnetic minerals in low-grade ores.

[0010] Option four, an optimal choice from the basic option, features a scale dial where the graduations are linearly correlated with the magnetite grade. The scale dial is first calibrated by loading mineral samples of different grades, such as 20%, 40%, and 60% grade standard samples. The pointer displacement is recorded, a "displacement-grade" straight line is plotted, and the graduations are marked linearly. During testing, the pointer position directly corresponds to the linear graduation value, allowing the user to read the grade without calculation.

[0011] Option 5, a preferred option of the basic scheme, involves a spring constant k matching the magnetic force F of the permanent magnet 3. The spring constant k of the spring 4 and the magnetic force F of the permanent magnet satisfy Hooke's Law.

[0012] F=k·Δx

[0013] Where Δx is the spring extension / retraction. By matching the spring's elastic coefficient k with the magnetic force F of the permanent magnet, it is ensured that the displacement is driven solely by the magnetism of the ore, eliminating interference from spring deformation or external vibrations.

[0014] Option six, a preferred embodiment of the basic option, features a slot on the small plastic box that engages with a connecting rod. The connecting rod can be removed from the slot, allowing the small plastic box to separate from the plastic shell, making it more convenient to store minerals. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a simple magnetite grade detection device according to the present invention;

[0016] Figure 2 This is a front view of a simple magnetite grade detection device according to this utility model;

[0017] Figure 3 yes Figure 2 Sectional view at point A in the middle. Detailed Implementation

[0018] The present invention will be further described in detail below through specific embodiments:

[0019] The reference numerals in the accompanying drawings are as follows: 1-Plastic housing; 2-Plastic box; 3-Permanent magnet; 4-Spring; 5-Connecting rod; 6-Scale; 7-Pointer; 8-Slot.

[0020] Example

[0021] like Figures 1 to 3 As shown: A simple magnetite grade testing device includes a plastic shell 1, a permanent magnet 3, and a spring 4. A small plastic box 2 is threadedly connected to the bottom of the plastic shell 1. The small plastic box 2 is made of transparent material and has volume scale lines marked on its side wall. The spring 4 is fixedly connected to the top of the plastic shell 1. The permanent magnet 3 is fixedly connected to a connecting rod 5. The permanent magnet 3 is a sheet-shaped neodymium iron boron magnet. The connecting rod 5 passes through the bottom of the small plastic box 2 and is fixedly connected to the free end of the spring 4. The connecting rod 5 is slidably connected to the plastic shell 1. A slot 8 is provided on the small plastic box 2, and the slot 8 engages with the connecting rod 5. The permanent magnet 3 is located directly below the small plastic box 2. A scale 6 is provided on the plastic shell 1. The scale value of the scale 6 has a linear correspondence with the magnetite grade. A pointer 7 is fixedly connected to the connecting rod 5.

[0022] The implementation method of this embodiment is as follows: Sample preparation: Take magnetite standard samples of known grades, such as 20%, 40%, and 60%, and crush them to a particle size ≤3 mm. Fill the standard samples into a fixed volume through the volume scale lines on the side wall of the transparent plastic box 2, and compact them to a uniform density. Record the position of the pointer 7 on the scale 6 when different grades of minerals are filled into the plastic box 2, and mark the scale values ​​of 40%, 60%, etc. in sequence to ensure that the scale of the scale 6 has a linear correspondence with the grade.

[0023] The sample is quantitatively filled to the same volume through the volume scale lines of the transparent plastic box 2 and compacted. The sample-filled plastic box 2 is then screwed into the bottom of the plastic shell 1. The magnetic field of the permanent magnet 3 attracts the magnetic mineral Fe3O4 in the sample. The magnetic force is transmitted to the spring 4 through the connecting rod 5, causing the spring 4 to compress. The compression of the spring 4 causes the connecting rod 5 and the pointer 7 to move vertically along the scale 6. The scale value corresponding to the final position of the pointer 7 is the magnetite grade.

[0024] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A simple magnetite grade detection device, characterized in that, The device includes a plastic shell (1), a small plastic box (2), a permanent magnet (3), and a spring (4). The small plastic box (2) is threaded to the bottom of the plastic shell (1). The spring (4) is fixedly connected to the top of the plastic shell (1). The permanent magnet (3) is fixedly connected to a connecting rod (5). The connecting rod (5) is fixedly connected to the free end of the spring (4). The connecting rod (5) is slidably connected to the plastic shell (1). The permanent magnet (3) is located directly below the small plastic box (2). A scale (6) is provided on the plastic shell (1). A pointer (7) is fixedly connected to the connecting rod (5).

2. The simple magnetite grade detection device according to claim 1, characterized in that... The plastic box (2) is made of transparent material and has volume scale lines marked on the side wall.

3. The simple magnetite grade detection device according to claim 1, characterized in that, The permanent magnet (3) is a disc-shaped neodymium iron boron magnet.

4. The simple magnetite grade detection device according to claim 1, characterized in that, The scale value of the scale (6) is linearly related to the grade of magnetite.

5. A simple magnetite grade detection device according to claim 1, characterized in that... The elastic coefficient of the spring (4) is matched with the magnetic force of the permanent magnet (3).

6. The simple magnetite grade detection device according to claim 1, characterized in that, The small plastic box (2) has a slot (8) which is engaged with the connecting rod (5).

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