Overflow coarse particle running prevention device of high weir type spiral classifier

Abstract

The utility model relates to a high weir type spiral classifier overflow anti coarse running device belongs to high weir type spiral classifier maintenance technical field, the device of the utility model is a smooth board, the board is installed on the overflow port of spiral classifier, the board takes the overflow port of spiral classifier as the reference line, the length is equal with the width of classifier overflow port, the width extends to a certain distance from the first frame operation support arm spiral blade of lower shaft head from the one side of classifier overflow port to the direction of upper shaft head, the board is set according to high down low from the direction of upper shaft head to lower shaft head, has a certain inclination gradient, the utility model makes the frequent '' coarse running '' phenomenon get effective control, and the classified overflow product is evenly distributed along the width of overflow port and is smoothly discharged.

Description

Technical Field

[0001] This utility model relates to an overflow prevention device for a high-weir spiral classifier, belonging to the field of maintenance technology for high-weir spiral classifiers. Background Technology

[0002] High-weir spiral classifiers are widely used worldwide for pre-classification or controlled classification in wet grinding processes at mineral processing plants. Their working principle is based on the "interference sedimentation" theory in fluid mechanics. Under normal operating conditions, the mineral slurry, which flows into the spiral classifier with uneven particle size and proportions and adjustable mineral solids weight concentration, is stirred and mixed by the rotating spiral blades. Products of a specific particle size (e.g., -0.074mm) required by the mineral processing technology design settle at a velocity less than their velocity towards the overflow outlet at the lower shaft head of the classifier, and are thus discharged from the overflow weir, becoming qualified products for the next process. Larger particles, after settling, are pushed upwards by the spiral blades towards the shaft head for further processing.

[0003] In production practice, when a high-weir spiral classifier is used to process ores with high density (e.g., greater than 2.8) containing components that are prone to mudding and caking during grinding (e.g., dolomite), coarse sand will accumulate and form caking lumps and "slurry flow channels" at three locations: the surface near the two inner sides of the tank and the upper shaft head of the lower shaft lifting screw, which are 300-500mm (depending on the classifier specifications) diagonally upwards from the overflow port (with the length equal to the width of the classifier tank). This causes the overflow slurry to become narrower and thicker, with a faster flow velocity, allowing coarse sand that does not meet the requirements of the next processing step to enter the next process – a phenomenon commonly referred to in mineral processing as "coarse sand runaway."

[0004] To effectively prevent "coarse sand overflow," operators must use shovels every 5-10 minutes to remove accumulated, compacted, and obstructed sand clumps that hinder the normal and even distribution of the graded overflow. This is due to two main reasons: firstly, the high frequency of shoveling, coupled with the hardening of the compacted sand, results in significant labor intensity; secondly, during the shoveling operation, mechanical injuries frequently occur when the shovel comes into contact with the normally rotating support arm or grading blades of the grader. Summary of the Invention

[0005] The technical problem to be solved by this utility model is: This utility model provides an overflow anti-coarseness device for a high-weir spiral classifier to solve the frequent "coarseness" phenomenon caused by sand accumulation at the overflow port of the classifier. This utility model effectively controls the frequent "coarseness" phenomenon, and the overflow product is evenly distributed along the width of the overflow port and discharged smoothly.

[0006] The technical solution of this utility model is: an overflow prevention device for a high-weir spiral classifier, wherein the device is a smooth plate; The plate is installed on the overflow port of the spiral classifier; The plate is based on the overflow port of the spiral classifier, with a length equal to the width of the overflow port. The width extends from one side of the overflow port towards the upper shaft head of the classifier to a certain distance from the spiral blade of the first operating support arm of the lower shaft head. The plate is set with a slope from top to bottom along the direction from the upper shaft head to the lower shaft head, and has a certain angle of inclination.

[0007] Furthermore, the board is a steel plate, epoxy resin board, polyurethane board, or similar material.

[0008] Furthermore, the width of the plate extends from the overflow port side of the classifier towards the upper shaft head of the classifier to a distance of 50mm from the spiral blade of the first operating support arm of the lower shaft head.

[0009] Furthermore, the plate is arranged with a higher top and lower bottom in the direction from the upper shaft head to the lower shaft head, with an inclination slope of 0.7 to 1.0%.

[0010] Furthermore, the plate is bolted to the overflow port of the spiral classifier.

[0011] Furthermore, the plate has an opening on one side at the middle position, and the width of the opening is greater than the diameter of the lower shaft head lifting screw 2, which facilitates installation and disassembly from the lower shaft head lifting screw 2.

[0012] Furthermore, the plate is made of 3mm steel plate or 6mm epoxy resin plate.

[0013] The beneficial effects of this utility model are: 1. This utility model can effectively control the frequent "coarse running" of the classifier, stabilize the quality of the overflow product, ensure that the overflow product is evenly distributed along the width of the overflow port and discharged smoothly, and ensure that the fineness content of the overflow product is stable. 2. This utility model can effectively reduce the labor intensity of operators and effectively reduce operational safety risks; 3. This utility model has high practical value for improving the important process parameters of wet grinding and classification in mineral processing plants and reducing operational safety risks. Attached Figure Description

[0014] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the present invention, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without any inventive effort.

[0015] Figure 1This is a front view of a grading machine after the present invention has been installed; Figure 2 This is a top view of a grading machine after this utility model has been installed.

[0016] Figure 1-2 The following are the reference numerals: 1-Lower shaft head lifting transmission unit, 2-Lower shaft head lifting screw, 3-Lower shaft head lifting gantry, 4-An overflow anti-coarseness device for a high-weir spiral classifier, 5-Classifier overflow port, 6-Classifier overflow weir, 7-Overflow discharge pipe, 8-Classifier spiral blade, 9-Classifier trough, 10-Classifier return sand trough, 11-Classifier transmission system, 12-Ф6mm bolt fixing position. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0018] The basic idea of ​​this utility model is that, since there is a card seat and a disc support bearing at the lower shaft head of the classifier, a space is formed between the overflow port 5 of the classifier and the spiral blade 8 of the classifier, which is 300~500mm wide (related to the specifications of the classifier) ​​and has a length equal to the width of the classifier trough (a high weir type spiral classifier overflow anti-coarseness device 4 added in this utility model).

[0019] In production practice, without the installation of this utility model device, after coarse sand accumulates to the height of the overflow port, the overflow should be evenly distributed along the width of the overflow port and discharged smoothly and stably to the overflow weir 6. However, due to the combined influence of the resistance of the sand surface above the overflow port 5 of the classifier and the edge of the tank, the two ends of the tank and the upper shaft of the lower shaft lifting screw 2 in the shaded area of ​​the figure will quickly (5~10 minutes) accumulate sand, forming two "slurry flow channels". In severe cases, it is like "piping". The classifier overflow "runs out of coarse sand", affecting the operation of the next process. Workers must shovel sand every 5~10 minutes, which is labor-intensive, especially during the middle and night shifts. The poor visibility can easily cause mechanical injury accidents.

[0020] After the device of this utility model is installed, a smooth surface with very low specific resistance is formed, which ensures that the graded overflow is stably and evenly distributed along the overflow port and smoothly discharges qualified products. Even if a small amount of fine sand accumulates, the worker can easily remove it with a small "squeegee".

[0021] The following is a detailed description of an overflow prevention device for a high-weir spiral classifier according to the present invention, with reference to the accompanying drawings.

[0022] Example 1: As Figures 1-2 As shown, a high-weir spiral classifier overflow prevention device is a smooth plate. The plate is installed on the overflow port of the spiral classifier; The plate is based on the overflow port of the spiral classifier, with a length equal to the width of the overflow port. The width extends from one side of the overflow port towards the upper shaft head of the classifier to a certain distance from the spiral blade of the first operating support arm of the lower shaft head. The plate is set with a slope from top to bottom along the direction from the upper shaft head to the lower shaft head, and has a certain angle of inclination.

[0023] Furthermore, the board can be made of 3mm steel plate, 6mm epoxy resin board or polyurethane board, or other similar boards with sufficient strength and smooth surface can be used as substitutes.

[0024] Furthermore, the width of the plate extends from the overflow port side of the classifier towards the upper shaft head of the classifier to a distance of 50mm from the spiral blade of the first operating support arm of the lower shaft head.

[0025] Furthermore, the plate is arranged with a higher top and lower bottom in the direction from the upper shaft head to the lower shaft head, with an inclination slope of 0.7 to 1.0%.

[0026] Furthermore, the plate is fixed to the overflow port of the spiral classifier with bolts. It is detachable, movable, and allows the overflow slurry to be evenly distributed along the overflow width of the classifier and smoothly discharged from the overflow port as a "smooth inclined surface". Specifically, the plate is provided with mounting holes on both sides near the tank body and is fixed to the overflow port of the spiral classifier with 6mm bolts for easy disassembly and assembly.

[0027] Furthermore, the plate has an opening on one side of its middle position, the width of which is larger than the diameter of the lower shaft head lifting screw 2, facilitating installation and disassembly from the lower shaft head lifting screw 2. Specifically, during installation, the opening on one side of the middle position of the plate is inserted into the lower shaft head lifting screw 2; during disassembly, it is simply removed. In this way, the normal operation of the lifting screw is not affected when manufacturing, installing, and using this utility model device.

[0028] This invention effectively controls the frequent "coarse sand run-out" phenomenon caused by sand accumulation at the overflow port of the classifier. The overflow is evenly distributed along the width of the overflow port and discharged smoothly, with a stable -200 mesh content in the overflow product. The labor intensity of operators is reduced by more than 90% (if a small amount of fine sand accumulates on the device, it can be easily scraped off with a small scraper, without the need for a large shovel). Operational safety risks are reduced and eliminated. This invention has been applied to several high-weir spiral classifiers in the second workshop of the beneficiation plant, with significant results and high praise from operators.

[0029] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. The utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A device for preventing coarse material leakage from overflowing a high-weir spiral classifier, characterized in that: The device is a smooth plate; The plate is installed on the overflow port of the spiral classifier; The plate is based on the overflow port of the spiral classifier, with a length equal to the width of the overflow port. The width extends from one side of the overflow port towards the upper shaft head of the classifier to a certain distance from the spiral blade of the first operating support arm of the lower shaft head. The plate is set with a slope from top to bottom along the direction from the upper shaft head to the lower shaft head, and has a certain angle of inclination.

2. The overflow prevention device for the high-weir spiral classifier according to claim 1, characterized in that: The board is a steel plate, an epoxy resin board, or a polyurethane board.

3. The overflow prevention device for the high-weir spiral classifier according to claim 1, characterized in that: The width of the plate extends from the overflow port side of the classifier towards the upper shaft head of the classifier to a distance of 50mm from the spiral blade of the first operating support arm of the lower shaft head.

4. The overflow prevention device for the high-weir spiral classifier according to claim 1, characterized in that: The plate is set with the upper part higher than the lower part in the direction from the upper shaft head to the lower shaft head, and the slope angle is 0.7 to 1.0%.

5. The overflow prevention device for the high-weir spiral classifier according to claim 1, characterized in that: The plate is bolted to the overflow port of the spiral classifier.

6. The overflow prevention device for the high-weir spiral classifier according to claim 1, characterized in that: The plate has an opening on one side at the middle position, and the width of the opening is greater than the diameter of the lower shaft head lifting screw (2), so as to facilitate installation and disassembly from the lower shaft head lifting screw (2).

7. The overflow prevention device for the high-weir spiral classifier according to claim 1, characterized in that: The board is made of 3mm steel plate or 6mm epoxy resin board.

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