Quantitative feeding system of ball mill

Abstract

The utility model discloses a quantitative feeding system of a ball mill and belongs to the technical field of feeding equipment. Which comprises a ball mill (8) and a belt weigher (5), a weighing sensor and a speed sensor used for monitoring the running speed of a conveying belt (17) are arranged in the belt weigher (5), and is characterized in that a disc feeder (2) is arranged, a stock bin (1) is arranged at an inlet of the disc feeder (2), and the discharging end of the disc feeder (2) is connected with a feeding port (14) of the belt weigher (5); signal output ends of the weighing sensor and the speed sensor are connected with an input end of a controller, an output end of the controller is connected with a frequency converter, and the frequency converter is connected with a driving motor of the disc feeder (2). In the quantitative feeding system of the ball mill, compared with the scheme of realizing quantitative feeding by controlling a belt weigher in the prior art, the hysteresis quality of weight control is more favorably eliminated, the regulation stability is improved, and accurate feeding is realized.

Description

Technical Field

[0001] The invention discloses a quantitative feeding system for a ball mill, belonging to the technical field of feeding equipment. Background Art

[0002] The ball mill is a key equipment for crushing materials after they are broken. It is widely used in cement, silicate products, new building materials, refractory materials and other industries. It can grind various ores and other grindable materials. For the ball mill, what is needed in the grinding of materials is safe and stable production. If the feeding and discharging speeds are unbalanced during material processing, the accumulated content of coarse-grained materials in the ball mill cylinder is not enough, and the fine-grained materials after ball milling are not discharged in time, the production capacity will be reduced and the production cost will increase. Therefore, stable and quantitative feeding to the ball mill is an important means to ensure the production capacity of the ball mill.

[0003] In the prior art, in the case of quantitative feeding, it is mainly achieved through a belt scale, such as the technical solution disclosed in the Chinese utility model patent with application number 202111524639.6, application date December 14, 2021, and patent name "A belt scale with quantitative feeding function". In this technical solution, a feeding box is provided, and after weighing is completed in the feeding box, the material is unloaded by the belt. Although this method can achieve accurate feeding of materials, its efficiency is low.

[0004] In the prior art, there are also some technical solutions for real-time weight adjustment, such as the technical solution disclosed in the Chinese utility model patent with application number 201821853095.1, application date November 12, 2018, and patent name "A quantitative feeding device for the feeding port of a clay belt scale"; the technical solution disclosed in the Chinese utility model patent with application number 201720805965.7, application date July 5, 2017, and patent name "A quantitative feeding system". In the above technical solutions, although the weight adjustment is achieved. However, it is found during use that when adjusting the belt scale, the adjustment process is relatively lagging, and the length of the belt scale needs to be increased to compensate.

[0005] The application number is 202120586100.2, the application date is March 23, 2021, and the patent name is "A wet ball mill with a quantitative feeding device". In this technical solution, two signals, namely the weighing weight and the running speed of the belt scale, are collected at the same time to further achieve quantitative control. However, in its technical solution, the belt scale still needs to be controlled.

[0006] Therefore, designing a technical solution that can achieve accurate and stable feeding to ensure the production capacity of the ball mill has become an urgent problem to be solved in this field. Utility Model Content

[0007] The technical problem to be solved by the utility model is: to overcome the shortcomings of the prior art and provide a quantitative feeding system for a ball mill, which realizes quantitative feeding by controlling the discharge speed of a disc feeder. Compared with the prior art solution of controlling a belt scale to realize quantitative feeding, it is more conducive to eliminating the lag of weight control, improving the stability of adjustment, and realizing precise feeding.

[0008] The technical solution adopted by the utility model to solve its technical problems is: the quantitative feeding system of the ball mill comprises a ball mill and a belt scale, a silo is arranged at the inlet of the belt scale, the outlet of the belt scale is connected to the inlet of the ball mill, a weighing sensor and a speed sensor for monitoring the running speed of the conveyor belt are arranged in the belt scale, and the utility model is characterized in that: a disc feeder is arranged, the silo is arranged at the inlet of the disc feeder, the discharging end of the disc feeder is connected to the feeding port of the belt scale; the signal output ends of the weighing sensor and the speed sensor are connected to the input end of the controller, the output end of the controller is connected to the frequency converter, and the frequency converter is connected to the driving motor of the disc feeder.

[0009] Preferably, an upper shell and a lower shell are provided on the outer cover of the belt scale, and a feed port for docking with the disc feeder is provided on the upper shell.

[0010] Preferably, a front discharge cover is provided at the outlet of the disc feeder, and the outlet of the front discharge cover is connected to the feed port through a retractable front connecting cylinder.

[0011] Preferably, a rear unloading cover is provided at the outlet of the belt scale, and the outlet of the rear unloading cover is connected to the ball mill through a retractable rear connecting cylinder.

[0012] Preferably, an observation window is also provided on the upper surface of the upper shell.

[0013] Preferably, a belt drive device is provided on the side of the upper shell, the belt drive device is coaxially fixed with the active roller of the belt scale, and a driven roller spaced from the active roller is also provided, and the conveying belt is sleeved on the outside of the active roller and the driven roller.

[0014] Preferably, the speed sensors are installed at the roller shafts of the active roller and the driven roller.

[0015] Preferably, a cleaning drive device is provided on the side of the upper shell, and a cleaning roller is coaxially fixed to the output end of the cleaning drive device in the upper shell. The cleaning roller is provided on the return path of the conveyor belt and contacts the surface of the conveyor belt.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] In the quantitative feeding system of the ball mill, quantitative feeding is achieved by controlling the discharge speed of the disc feeder. Compared with the prior art solution of controlling the belt scale to achieve quantitative feeding, it is more conducive to eliminating the lag of weight control, improving the stability of adjustment, and achieving precise feeding.

[0018] In the quantitative feeding system of the ball mill, both the front connecting tube and the rear connecting tube adopt a flexible and retractable structure, which improves the reliability of the connection.

[0019] In the quantitative feeding system of the ball mill, the belt scale forms a closed structure through the upper shell and the lower shell, which ensures the stability during feeding. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the quantitative feeding system structure of the ball mill.

[0021] Figure 2 This is the front view of the belt scale of the ball mill's quantitative feeding system.

[0022] Figure 3 for Figure 2 Top view of the .

[0023] Figure 4 This is the principle block diagram of the ball mill's quantitative feeding system control circuit.

[0024] Among them: 1, silo 2, disc feeder 3, front discharge cover 4, front connecting tube 5, belt scale 6, rear discharge cover 7, rear connecting tube 8, ball mill 9, belt drive device 10, cleaning drive device 11, observation window 12, upper shell 13, lower shell 14, feed port 15, driven roller 16, base 17, conveyor belt. DETAILED DESCRIPTION

[0025] Figures 1 to 4 It is the best embodiment of the utility model, and the following Figures 1 to 4 The utility model is further described.

[0026] like Figure 1 As shown, a quantitative feeding system of a ball mill includes a disc feeder 2, a silo 1 is arranged on the upper part of the disc feeder 2, and a front discharge cover 3 is arranged at the outlet of the disc feeder 2. A belt scale 5 is arranged to be connected with the front discharge cover 3, and the front discharge cover 3 and the feeding port 14 of the belt scale 5 (see Figure 2 ) are connected by a front connecting tube 4. A rear unloading cover 6 is provided at the discharge port of the belt scale 5, and the rear unloading cover 6 is connected to the ball mill 8. The ball mill 8 is provided below the belt scale 5, and the rear unloading cover 6 is connected to the ball mill 8 by a rear connecting tube 7. Both the front connecting tube 4 and the rear connecting tube 7 adopt a flexible and retractable structure, which improves the reliability of the connection.

[0027] Combination Figure 2~3 In the quantitative feeding system of the ball mill, the basic frame of the belt scale 5 is the same as that of the traditional belt scale 5, including a main frame and rollers arranged at both ends of the main frame, and a conveying belt 17 is arranged between the rollers at both ends. Among the rollers at both ends, one roller is a driven roller 15, and the other is a driving roller. A belt driving device 9 is arranged outside the main frame. The belt driving device 9 includes a belt driving motor and a reducer connected to the belt driving motor, and the output shaft of the reducer is coaxially fixed with the driving roller.

[0028] An upper shell 12 and a lower shell 13 are respectively arranged above and below the belt scale 5. The upper shell 12 and the lower shell 13 cover the main frame of the belt scale 5, so that the belt scale 5 in the quantitative feeding system of the ball mill is a closed structure, which ensures the stability during feeding.

[0029] An observation window 11 is provided on the upper surface of the upper shell 12 for observing the working state of the belt scale 5. The feed port 14 is also provided on the surface of the upper shell 12. A foot 16 is provided at the bottom of the lower shell 13 for supporting the belt scale 5. A cleaning drive device 10 is also provided on the side of the lower shell 13. The cleaning drive device 10 is provided below the belt drive device 9.

[0030] The structure of the cleaning drive device 10 is the same as that of the belt drive device 9, including a cleaning drive motor and a reducer connected to the cleaning drive motor, and the output shaft of the reducer passes through the lower housing 13 and then enters the interior thereof. The output shaft of the reducer is coaxially fixed with a cleaning roller in the lower housing 13, and the cleaning roller is located below the conveyor belt 17, and cleans the lower part of the conveyor belt 17 when the conveyor belt 17 returns to prevent materials from remaining on the surface of the conveyor belt 17. The cleaned materials fall into the lower housing 13 and are collected uniformly.

[0031] like Figure 4 As shown, in the quantitative feeding system of the ball mill, a speed sensor for monitoring the running speed of the conveyor belt 17 is provided, and the speed sensor is installed at the roller shaft of the active roller (or the driven roller 15) to monitor the running angular velocity of the active roller (or the driven roller 15). The signal output end of the speed sensor and the signal output end of the weighing sensor of the original belt in the belt scale 5 are connected to the controller, and the signal output end of the controller is connected to the signal input end of the frequency converter, and the output end of the frequency converter is connected to the driving motor of the disc feeder 2. The controller can be implemented by a common technical solution in this field, such as PLC.

[0032] The specific working process and working principle are as follows:

[0033] The disc feeder 2 works to deliver the material in the silo 1, and the material is delivered to the belt scale 5 through the front discharge cover 3 and the front connecting tube 4, and then the material is transported by the conveyor belt 17 in the belt scale 5. During the material transportation in the belt scale 5, the weighing sensor in the belt scale 5 and the speed sensor set in the belt scale 5 respectively send their collected signals to the controller.

[0034] The controller calculates the current feeding amount in real time according to the speed of the conveyor belt 17 and the weight of the material on the surface of the conveyor belt 17. If the feeding amount is greater than the preset weight, the controller sends a control signal to the frequency converter to reduce the discharge amount of the disc feeder 2 through the frequency converter. Similarly, if the feeding amount is less than the preset weight, the controller sends a control signal to the frequency converter to increase the discharge amount of the disc feeder 2 through the frequency converter. Since the running speed of the disc feeder 2 is controlled by the controller, compared with the scheme of controlling the running speed of the belt scale 5 in the prior art, it is more conducive to eliminating the lag of weight control, improving the stability of regulation, and realizing accurate feeding.

[0035] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A quantitative feeding system for a ball mill, comprising a ball mill (8) and a belt scale (5), wherein a silo (1) is arranged at the inlet of the belt scale (5), an outlet of the belt scale (5) is connected to the inlet of the ball mill (8), a weighing sensor and a speed sensor for monitoring the running speed of a conveyor belt (17) are arranged in the belt scale (5), and the system is characterized in that: A disc feeder (2) is provided, a silo (1) is provided at the entrance of the disc feeder (2), and a discharge end of the disc feeder (2) is connected to a feed port (14) of a belt scale (5); signal output ends of a weighing sensor and a speed sensor are connected to an input end of a controller, an output end of the controller is connected to a frequency converter, and the frequency converter is connected to a drive motor of the disc feeder (2); An upper shell (12) and a lower shell (13) are provided on the outer cover of the belt scale (5), and a feed port (14) is provided on the upper shell (12) for docking with the disc feeder (2); A front discharge cover (3) is provided at the outlet of the disc feeder (2), and the outlet of the front discharge cover (3) is connected to the feed port (14) via a retractable front connecting tube (4); A rear unloading cover (6) is provided at the outlet of the belt scale (5), and the outlet of the rear unloading cover (6) is connected to the ball mill (8) via a retractable rear connecting tube (7).

2. The quantitative feeding system of the ball mill according to claim 1, characterized in that: An observation window (11) is also provided on the upper surface of the upper shell (12).

3. The quantitative feeding system of the ball mill according to claim 1, characterized in that: A belt drive device (9) is provided on the side of the upper housing (12). The belt drive device (9) is coaxially fixed with a driving roller of a belt scale (5). A driven roller (15) is also provided which is spaced apart from the driving roller. A conveying belt (17) is sleeved on the outside of the driving roller and the driven roller (15).

4. The quantitative feeding system of the ball mill according to claim 3, characterized in that: The speed sensors are mounted on the roller shafts of the driving roller and the driven roller (15).

5. The quantitative feeding system of the ball mill according to claim 1, characterized in that: A cleaning drive device (10) is arranged on the side of the upper shell (12); a cleaning roller is coaxially fixed to the output end of the cleaning drive device (10) in the upper shell (12); the cleaning roller is arranged on the return path of the conveyor belt (17) and contacts the surface of the conveyor belt (17).

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