Ball feeding device for ore grinding machine

Abstract

The utility model discloses a ball feeding device for an ore grinding machine, and belongs to the technical field of ore grinding machine equipment. A ball feeding device for an ore grinding machine comprises an inclined steel ball pre-separation chute, a steel ball storage bin is arranged at the high end of the steel ball pre-separation chute, a ball feeding mechanism is arranged at the low end of the steel ball pre-separation chute, and the low end of the steel ball pre-separation chute is communicated with a feeding pipe of the ore grinding machine; the automatic ball feeding device has the advantages of replacing manual ball feeding operation, timely feeding balls and being large in number.

Description

Technical Field

[0001] The utility model relates to the technical field of mining equipment, in particular to a ball adding device for a grinding mill. Background Art

[0002] Grinding operations are widely used in metallurgy, chemical industry, building materials, ceramics, medicine and other departments. In the metallurgical industry, except for a few sand ores where useful minerals have been separated into monomers, almost all other materials need to be ground to obtain a relatively ideal monomer separation degree of useful minerals. The selection index of the ore dressing plant depends to a large extent on the quality of the grinding products. If the separation degree of useful minerals is not ideal, the selection index will not be ideal. If the conjoined bodies enter the concentrate, the grade of the concentrate will be reduced. If they enter the tailings, the recovery rate of useful minerals will be reduced. On the other hand, the grinding products should not be over-crushed. Over-crushing not only increases power consumption and steel consumption, but also deteriorates the selection process and deteriorates the selection index.

[0003] The power consumption and metal consumption of grinding operation are very large, usually the power consumption is about 15~25 kWh / ton, and the grinding medium and liner consumption is 0.6~1.5 kg / ton. The capital construction investment and maintenance costs of grinding operation are also very high. Therefore, from the perspective of production importance and economic benefits, research and improvement of grinding process methods and development of new equipment for adding grinding media (steel balls) are of great practical significance for reducing grinding costs and improving the quality of slurry indicators.

[0004] The grinding process is a very complex physical-chemical process, with many influencing factors, including the properties of the material being ground: hardness, toughness, crystallization characteristics, mud content, particle size entering the mill and required product fineness. The operating conditions include: mill speed, whether to use grinding media, and the density, shape, size, gradation, addition method and filling rate of the grinding media; grinding concentration during wet grinding, slurry rheological properties, ball-to-material ratio, slurry temperature, composition and abrasive properties. Many of the above factors are random, so so far, no mathematical model that includes all of the above factors has been developed to solve the problems of production optimization, mill simulation amplification and optimal control of the production process.

[0005] Among the many factors that affect the grinding efficiency of ball mills, the ball filling rate and gradation of the mill are very important factors. Steel balls will be consumed continuously during the grinding process, so they need to be added in time. At present, most ball mills in my country use manual ball replenishment. The grinding operation in the Bayer process alumina production of our factory also uses manual ball replenishment. The ball replenishment operation method of the ball mill is to add steel balls every Monday, Wednesday and Friday. This kind of ball replenishment method often has the following phenomenon: at the beginning, due to excessive steel balls, the ball consumption is too large. Later, as the steel balls are consumed, the grinding efficiency will decrease due to insufficient steel balls. This is also one of the main reasons for the generally low grinding efficiency of ball mills in my country.

[0006] At the same time, the shaft power of the ball mill is in a positive curve relationship with the filling rate of the ball mill. The larger the filling rate, the greater the shaft power. If the filling rate is too large, due to too many balls, the inner balls are prone to interference during the operation of the ball mill, destroying the normal circulation of the steel balls and reducing the grinding efficiency; and if the filling rate is too small, due to insufficient grinding media, the grinding efficiency will also be reduced. It can be seen that the shaft power of the ball mill depends on the filling rate of the ball mill, and the filling rate directly affects the grinding efficiency of the ball mill. When the ball mill determines its operating position and the properties of the ore to be ground, there is an optimal ball load filling rate, and this optimal ball load filling rate needs to be measured in experiments and production practice.

[0007] The manual method of adding balls regularly is not only untimely and inaccurate, but also does not conform to the working rules of the ball mill. Moreover, as the ball mill becomes larger, the amount and speed of adding balls cannot be met, which greatly increases the workload and work intensity of workers. Therefore, we propose a device that can realize the continuous and uniform addition of grinding media (steel balls). Utility Model Content

[0008] The utility model aims to solve the problem that the grinding media in the field of the grinding machine are artificially added, resulting in untimely ball replenishment, large fluctuations in ball load filling rate, and further affecting the grinding efficiency, grinding cost, and slurry index quality, and proposes a ball adding device for the grinding machine.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] A ball adding device for a grinding mill comprises an inclined steel ball pre-separation chute, a steel ball storage bin is arranged at the higher end of the steel ball pre-separation chute, a ball feeding mechanism is arranged at the lower end of the steel ball pre-separation chute, and the lower end of the steel ball pre-separation chute is connected to a feeding pipe of the grinding mill.

[0011] Furthermore, the ball feeding mechanism includes a rotating shaft, the rotation direction of the rotating shaft is consistent with the rolling direction of the steel balls in the steel ball pre-dividing chute, and a plurality of concave arc baffles are arranged on the circumferential surface of the rotating shaft. The plurality of concave arc baffles are radially distributed, and a ball feeding unit is formed between two adjacent concave arc baffles.

[0012] Furthermore, a driven sprocket is installed at one end of the rotating shaft, a variable frequency motor is arranged on the steel ball pre-dividing chute, a driving sprocket is arranged on the working end of the variable frequency motor, and the driving sprocket and the driven sprocket are connected by a transmission chain.

[0013] Furthermore, a steel ball counting chute is arranged between the steel ball pre-separation chute and the grinding mill feed pipe, and both ends of the steel ball counting chute are respectively connected to the outlet of the steel ball pre-separation chute and the inlet of the grinding mill feed pipe, and a counting sensor is installed on the steel ball counting chute.

[0014] Furthermore, a rapper is installed on the steel ball storage bin.

[0015] Furthermore, a rapper is installed on the steel ball pre-separation chute.

[0016] Furthermore, a detection sensor is provided at the bottom of the steel ball pre-separation chute.

[0017] Furthermore, the steel ball storage bin is funnel-shaped, and a bin opening is provided at the bottom of the steel ball storage bin, and the bin opening is located above the steel ball pre-separation chute.

[0018] Furthermore, the inclination angle of the steel ball pre-separation chute is 5-8 degrees.

[0019] Compared with the prior art, the utility model provides a ball adding device for a grinding mill, which has the following beneficial effects:

[0020] The utility model discloses a ball adding device for a grinding mill. When in use, steel balls are loaded into a steel ball storage bin. Due to their own weight, the steel balls fall from the steel ball storage bin into a steel ball pre-dividing chute, roll from a high end to a low end, and are then blocked by a ball feeding mechanism. The ball feeding mechanism feeds the balls into a feeding pipe of the grinding mill according to quantity and time requirements. Compared with traditional manual ball adding, the device can be continuously operated to perform ball adding operations, so that balls can be replenished in time and fluctuations in ball load filling rate are reduced, thereby ensuring the grinding efficiency of the grinding mill.

[0021] Other advantages, objectives and features of the present invention will be described in the following description to some extent; and will be apparent to those skilled in the art based on the following examination and study to some extent; or, may be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 It is a side structural diagram of the ball delivery mechanism of the utility model;

[0024] Figure 3 For this utility model Figure 2 Schematic diagram of the cross section along the 1-1 direction.

[0025] In the figure:

[0026] 1. Steel ball storage bin; 2. Steel balls; 3. Bin opening; 4. Vibrator; 5. Steel ball pre-dividing chute; 6. Detection sensor; 7. Ball feeding mechanism; 8. Frequency conversion motor; 9. Driving sprocket; 10. Driven sprocket; 11. Transmission chain; 12. Protective cover; 13. Steel ball counting chute; 14. Counting sensor; 15. Frame; 16. Ball outlet; 17. Concave arc baffle; 18. Ball feeding unit; 19. Bearing. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0028] Reference Figure 1-3 The utility model is a ball adding device for a grinding mill, comprising a steel ball pre-dividing chute 5 which is arranged obliquely, a steel ball storage bin 1 is arranged at a higher end of the steel ball pre-dividing chute 5, a ball feeding mechanism 7 is arranged at a lower end of the steel ball pre-dividing chute 5, and the lower end of the steel ball pre-dividing chute 5 is connected to a feeding pipe of the grinding mill.

[0029] The steel ball pre-separation chute 5 is installed on the frame 15. When in use, the steel balls 2 to be added are added into the steel ball storage bin 1. The steel balls 2 fall into the steel ball pre-separation chute 5, roll to the ball feeding mechanism 7, and are fed into the feed pipe of the grinding mill through the ball feeding mechanism 7, thereby replacing manual labor and performing continuous ball adding and replenishing operations.

[0030] The ball feeding mechanism 7 includes a rotating shaft, the rotation direction of which is consistent with the rolling direction of the steel balls 2 in the steel ball pre-dividing chute 5. A plurality of concave arc baffles 17 are arranged on the circumferential surface of the rotating shaft. The plurality of concave arc baffles 17 are radially distributed, and a ball feeding unit 18 is formed between two adjacent concave arc baffles 17.

[0031] The side cross-sections of the multiple concave arc baffles 17 are radially "M"-shaped and evenly distributed. The concave arc size of the concave arc baffles 17 is consistent with the size of the steel ball 2, or slightly larger, so that only one steel ball 2 can be loaded into the same ball feeding unit 18 at a time. During the rotation process, the ball feeding mechanism 7 feeds one steel ball 2 into the feed pipe of the grinding mill each time, which is convenient for controlling the number and speed of ball feeding.

[0032] A driven sprocket 10 is installed at one end of the rotating shaft, a frequency conversion motor 8 is arranged on the steel ball pre-dividing chute 5, a driving sprocket 9 is arranged on the working end of the frequency conversion motor 8, and the driving sprocket 9 and the driven sprocket 10 are connected by a transmission chain 11.

[0033] The transmission shaft is rotatably mounted on the steel ball pre-separation chute 5 through a bearing 19, and a protective cover 12 is installed on the transmission chain 11. The device is externally connected to an electric control cabinet, and a human-machine interface touch screen is arranged on the box body of the electric control cabinet. The PLC system arranged in the box body is respectively connected to the human-machine interface touch screen and the ball adding device to control the operation and stop of the ball adding device. Specifically, the PLC system controls the start and stop and the speed of the variable frequency motor 8 through the controller, thereby adjusting the number of balls fed into the grinding mill.

[0034] The operation of the ball adding device can be controlled by a PLC system to realize automatic ball adding. The device has a simple mechanical structure and is less restricted by the site, and is particularly suitable for places with small ball adding operation space.

[0035] The ball adding program can also be preset on the PLC system through the human-machine interface touch screen to automatically control the ball adding time and frequency, accurately control the ball adding amount and ball load filling rate, and maintain the best grinding effect.

[0036] The "manual / automatic" switch can also be used to manually control the amount of balls added, which is easy to operate and can meet special ball adding needs.

[0037] A steel ball counting chute 13 is arranged between the steel ball pre-classification chute 5 and the grinding mill feed pipe. The two ends of the steel ball counting chute 13 are respectively connected with the outlet of the steel ball pre-classification chute 5 and the inlet of the grinding mill feed pipe. A counting sensor 14 is installed on the steel ball counting chute 13.

[0038] The ball counting chute 13 is also tilted, and the higher end of the ball counting chute 13 is connected to the lower end of the ball pre-dividing chute 5, and the lower end of the ball counting chute 13 is a ball outlet 16, which is connected to the inlet of the grinding mill feed pipe.

[0039] The counting sensor 14 is electrically connected to the electric control cabinet. The counting sensor 14 can be an infrared sensor or a proximity switch. When the steel ball 2 rolls through the counting sensor 14 from the steel ball counting chute 13, the counting sensor 14 sends a signal to the PLC system of the electric control cabinet for quantity counting, so as to accurately control the number of steel balls 2 added to the grinding mill.

[0040] A rapper 4 is installed on the steel ball storage bin 1 and the steel ball pre-separation chute 5 .

[0041] The steel ball storage bin 1 and the steel ball pre-dividing chute 5 are vibrated and struck by the rapper 4 to prevent the steel balls 2 from getting stuck, thereby ensuring that the connecting area between the steel ball pre-dividing chute 5 and the ball feeding mechanism 7 always contains continuously arranged steel balls 2.

[0042] A detection sensor 6 is provided at the bottom of the steel ball pre-separation chute 5 .

[0043] The detection sensor 6 can also be an infrared sensor. The detection sensor 6 is electrically connected to the electric control cabinet. The detection sensor 6 is installed at the bottom of the steel ball pre-separation chute 5 and in front of the ball feeding mechanism 7. When the sensing end of the detection sensor 6 is blocked, it means that there are steel balls 2 in the connection area between the steel ball pre-separation chute 5 and the ball feeding mechanism 7. When there are steel ball vacancies in the connection area between the steel ball pre-separation chute 5 and the ball feeding mechanism 7, it means that the steel balls 2 in the steel ball pre-separation chute 5 or the steel ball storage bin 1 are stuck. In this case, the vibrator 4 can be started to deal with the steel ball jam.

[0044] The steel ball storage bin 1 is funnel-shaped, and a bin opening 3 is provided at the bottom of the steel ball storage bin 1 , and the bin opening 3 is located above the steel ball pre-dividing chute 5 .

[0045] The size of the warehouse opening 3 is between one steel ball 2 and two steel balls 2, ensuring that one steel ball falls each time. At the same time, the distance between the warehouse opening 3 and the steel ball pre-dividing chute 5 is also between one steel ball 2 and two steel balls 2, that is, when the steel ball pre-dividing chute 5 is full of steel balls 2, it will resist the steel balls 2 in the steel ball storage bin 1, preventing the steel balls 2 in the steel ball storage bin 1 from falling without restriction.

[0046] The inclination angle of the steel ball pre-separation chute 5 is 5-8 degrees.

[0047] This inclination angle can make the steel balls 2 roll smoothly in the steel ball pre-dividing chute 5, and the rolling speed will not be too fast, so as to avoid the situation where the steel balls 2 roll too fast and seriously collide with the steel ball pre-dividing chute 5, other steel balls 2 and the ball feeding mechanism 7.

[0048] Working principle: connect the device to the feed pipe of the grinding mill, add steel balls 2 into the steel ball storage bin 1, and the steel balls 2 in the steel ball storage bin 1 fall into the steel ball pre-dividing chute 5 through the warehouse opening 3 under the action of gravity. Based on the inclination angle of the steel ball pre-dividing chute 5 and the self-weight of the steel balls, the steel balls 2 roll to the connection area between the steel ball pre-dividing chute 5 and the ball feeding mechanism 7 and enter the ball feeding unit 18. The frequency conversion motor 8 drives the rotating shaft to rotate through the driving sprocket 9, the transmission chain 11, and the driven sprocket 10, and then drives the ball feeding unit 18 to rotate. The steel balls 2 entering the ball feeding unit 18 are brought to a high place as the ball feeding mechanism 7 rotates, and then roll into the steel ball counting chute 13 due to their own weight. After passing through the counting sensor 14, they are discharged into the feed pipe of the grinding mill from the ball outlet 16 to complete a ball replenishing action.

[0049] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0051] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A ball adding device for a grinding mill, comprising a steel ball pre-separation chute (5) arranged obliquely, characterized in that: A steel ball storage bin (1) is provided at the upper end of the steel ball pre-separation chute (5), a ball feeding mechanism (7) is provided at the lower end of the steel ball pre-separation chute (5), and the lower end of the steel ball pre-separation chute (5) is connected to a grinding mill feed pipe.

2. A ball adding device for a grinding mill according to claim 1, characterized in that: The ball delivery mechanism (7) comprises a rotating shaft, the rotation direction of the rotating shaft being consistent with the rolling direction of the steel balls (2) in the steel ball pre-dividing chute (5), a plurality of concave arc baffles (17) being arranged on the circumferential surface of the rotating shaft, the plurality of concave arc baffles (17) being radially distributed, and a ball delivery unit (18) is formed between two adjacent concave arc baffles (17).

3. A ball adding device for a grinding mill according to claim 2, characterized in that: A driven sprocket (10) is mounted on one end of the rotating shaft, a variable frequency motor (8) is mounted on the steel ball pre-dividing chute (5), a driving sprocket (9) is mounted on the working end of the variable frequency motor (8), and the driving sprocket (9) and the driven sprocket (10) are connected via a transmission chain (11).

4. A ball adding device for a grinding mill according to claim 1, characterized in that: A steel ball counting chute (13) is provided between the steel ball pre-classification chute (5) and the grinding mill feed pipe, and the two ends of the steel ball counting chute (13) are respectively connected to the outlet of the steel ball pre-classification chute (5) and the inlet of the grinding mill feed pipe, and a counting sensor (14) is installed on the steel ball counting chute (13).

5. The ball adding device for a grinding mill according to claim 1, characterized in that: A rapper (4) is installed on the steel ball storage bin (1).

6. A ball adding device for a grinding mill according to claim 1, characterized in that: A rapper (4) is installed on the steel ball pre-separation chute (5).

7. The ball adding device for a grinding mill according to claim 1, characterized in that: A detection sensor (6) is provided at the bottom of the steel ball pre-separation chute (5).

8. A ball adding device for a grinding mill according to claim 1, characterized in that: The steel ball storage bin (1) is funnel-shaped, and a bin opening (3) is provided at the bottom of the steel ball storage bin (1), wherein the bin opening (3) is located above the steel ball pre-separation chute (5).

9. A ball adding device for a grinding mill according to claim 1, characterized in that: The inclination angle of the steel ball pre-separation chute (5) is 5-8 degrees.

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