A mining ball mill

Abstract

The present invention discloses a mine ball mill, which includes a rotatably arranged cylinder body. A storage box is joined to the outer side of the cylinder body. A communication port is formed on the inner cavity wall of the cylinder body. The opening of the storage box is adapted to be switched between opening and closing. By controlling the opening and closing of the opening of the storage box, when it is necessary to reduce the steel ball filling rate, the ball mill can be controlled to enter the material storage mode, and the steel balls can be filled and retained in the storage box, so that the number of steel balls in the cylinder body is reduced; when it is necessary to increase the steel ball filling rate, the ball mill can be controlled to enter the discharging mode, and the steel balls will fall out of the storage box, so that the number of steel balls in the cylinder body is increased. Compared with the prior art, in the present invention, a storage box is joined to the outer side of the cylinder body. By controlling the opening and closing of the opening of the storage box, the steel balls in the cylinder body can be conveniently taken out and put in, and the ball mill does not need to stop during this period, and has a high operation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of crushing equipment, and in particular, to a mining ball mill. Background Art

[0002] A ball mill is a crushing equipment widely used in industries such as mines, building materials, and chemicals. It mainly consists of a horizontally or inclined cylindrical barrel, a driving device, and grinding media. Its working principle is that through the rotation of the barrel, the internal steel balls are repeatedly thrown under the action of centrifugal force and gravity, generating impact, grinding, and shearing effects on the materials to achieve efficient crushing and uniform mixing.

[0003] In the field of mining crushing, different materials of ores require different crushing forces, and a major factor determining the crushing force of the ball mill is the filling rate of the steel balls. If the filling rate of the steel balls is too low, it will lead to a reduction in the grinding area and a decrease in the number of impacts, ultimately resulting in insufficient crushing of the materials; if the filling rate of the steel balls is too high, the materials will be crushed to an undesired small particle size.

[0004] However, the existing ball mills have a relatively inconvenient way to adjust the number of steel balls. For example, generally, it is necessary to stop the machine and manually remove or add steel balls, resulting in a reduction in operating efficiency. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a mining ball mill.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A mining ball mill includes a rotatably arranged barrel, a storage box is joined to the outside of the barrel, a communication port is constructed on the inner cavity wall of the barrel, the opening of the storage box is adapted to be switchably opened and closed, and through the opening and closing control of the opening of the storage box, the ball mill has at least the following modes: a storage mode, in the storage mode, the opening of the storage box is opened, the grinding media in the barrel enter the storage box through the communication port, and then the opening of the storage box is closed again; a discharging mode, in the discharging mode, the opening of the storage box is opened again, and the grinding media in the storage box re-enter the inner cavity of the barrel through the communication port.

[0008] Preferably, a connecting sleeve is sleeved outside the barrel, and the storage box is arranged on the connecting sleeve.

[0009] Preferably, the storage box is at least partially located in the lifting area of the grinding media in the circumferential direction.

[0010] Preferably, an opening and closing plate is provided at the opening of the storage box, and a driving mechanism is further provided on the storage box, and the driving mechanism is used to drive the opening and closing plate to open and close the opening of the storage box.

[0011] Preferably, the opening and closing plate includes opposed first opening and closing units and second opening and closing units. Along the lifting direction of the grinding media, the first opening and closing unit is located at the front end of the second opening and closing unit; in the material storage mode, the first opening and closing unit is in an open state, and the second opening and closing unit is in a closed state; in the discharging mode, the first opening and closing unit is in a closed state, and the second opening and closing unit is in an open state.

[0012] Preferably, the first opening and closing unit is located in the lifting area of the grinding media in the circumferential direction, and the second opening and closing unit is offset from the lifting area of the grinding media in the circumferential direction.

[0013] Preferably, the ball mill further has the following mode: a crushing mode, in which the first opening and closing unit and the second opening and closing unit are both in an open state, so that the grinding media in the cylinder body knock out the grinding media in the storage box.

[0014] Preferably, the second opening and closing unit is adapted to be rotatable between an open position and a closed position, and thereby change the discharging angle of the grinding media.

[0015] Preferably, the connecting sleeve is rotatably arranged; in the material storage mode, the connecting sleeve rotates to make the storage box located at the bottom of the cylinder body; in the discharging mode, the connecting sleeve rotates to make the storage box located at the top of the cylinder body.

[0016] Preferably, a liquid cooling space is defined between the cylinder and the connecting sleeve, a gravity plate is slidably provided at the inner end surface of the storage box, a pump liquid flow channel is provided in the storage box, the cross-section of the pump liquid flow channel is "冂"-shaped, a liquid inlet flow channel connected to the liquid cooling space is provided in the cylinder, a liquid outlet flow channel connected to the liquid cooling space is also provided in the cylinder, and a liquid spray port connected to the liquid cooling space is provided on the cylinder; a one-way valve 1 is provided in the liquid inlet flow channel, and the one-way valve 1 is adapted to allow the fluid to flow to one side of the pump liquid flow channel; a one-way valve 2 is provided in the liquid outlet flow channel, and the one-way valve 2 is adapted to allow the fluid to flow to one side of the liquid cooling space; a one-way valve 3 is provided in the liquid spray port, and the one-way valve 3 is adapted to allow the fluid to flow to one side of the liquid cooling space Flows toward one side of the inner cavity of the cylinder; a stop plate is also slidably provided in the storage box for limiting the sliding stroke of the gravity plate; the gravity plate includes a sealing portion, and a pump liquid cavity is opened on the inner end surface of the storage box, and the sealing portion is sealingly slidably provided in the pump liquid cavity; the pump liquid flow channel is adapted to flow through the pump liquid cavity, and the ends of the liquid inlet flow channel and the liquid outlet flow channel away from the liquid cooling space are both connected to the outer wall of the cylinder, and both ends of the pump liquid flow channel are both connected to the inner wall of the connecting sleeve, and the ball mill also has the following modes: pump liquid mode, in the pump liquid mode, the connecting sleeve rotates and makes the two ends of the pump liquid flow channel connected to the liquid inlet flow channel and the liquid outlet flow channel respectively, and then controls the connecting sleeve to rotate synchronously with the cylinder.

[0017] The beneficial effects of the present invention are:

[0018] 1. When the steel ball filling rate needs to be reduced, the ball mill can be controlled to enter the storage mode, and the steel balls can be filled and held in the storage box, thereby reducing the number of steel balls in the cylinder; when the steel ball filling rate needs to be increased, the ball mill can be controlled to enter the discharge mode, and the steel balls will fall out of the storage box, thereby increasing the number of steel balls in the cylinder. Compared with the existing technology, the present invention has a storage box connected to the outside of the cylinder. By opening and closing the opening of the storage box, the steel balls in the cylinder can be conveniently taken out and put in, and the ball mill does not need to be shut down during this period, which has higher operating efficiency.

[0019] 2. In the storage mode, the steel balls are automatically thrown into the storage box by centrifugal force. As the storage box opening is reopened, the steel balls can maintain a higher initial position so that they can automatically fall back into the cylinder by gravity in the discharge mode.

[0020] 3. The ball mill of the present invention also has a crushing mode. In this mode, the steel balls in the cylinder will enter the storage box from the first opening and closing unit under the action of centrifugal force, and the steel balls entering the storage box will impact the steel balls in the storage box, which will cause the steel balls in the storage box to be knocked out of the storage box from the second opening and closing unit. At this time, the steel balls will obtain greater kinetic energy than free fall, so as to have a better impact and crushing effect on the materials in the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of an embodiment;

[0022] Figure 2 is a schematic structural diagram of the opening and closing plate;

[0023] Figure 3 is a schematic structural diagram of another embodiment;

[0024] Figure 4 is a schematic structural diagram of the gravity plate.

[0025] Reference numerals: 1, cylinder; 2, storage box; 3, communication port; 4, connecting sleeve; 5, opening and closing plate; 6, first opening and closing unit; 7, second opening and closing unit; 8, liquid cooling space; 9, gravity plate; 10, pump liquid flow channel; 11, inlet liquid flow channel; 12, outlet liquid flow channel; 13, liquid spraying port; 14, check valve one; 15, check valve two; 16, check valve three; 17, stop baffle; 18, sealing part; 19, pump liquid cavity; 20, ball inlet; 21, ball outlet; 22, water tank. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] As Figures 1 to 4 shown, a mining ball mill includes a hollow cylinder 1. For example, both ends of the cylinder 1 are respectively configured as a feed port and a discharge port. Materials enter the cylinder 1 through the feed port, and the cylinder 1 rotates under the drive of a driving device (not shown in the figure). At this time, the steel balls in the cylinder 1 will be lifted under the action of centrifugal force until they fall back to the bottom of the cylinder 1 again. Crushing is achieved by the impact of the steel balls when they fall, and the materials can also be ground by being squeezed and rubbed between several steel balls. In an ideal situation, the materials with the expected particle size will be output from the discharge port.

[0028] There are various driving devices for driving the rotation of the cylinder 1 disclosed in the prior art. For example, the transmission of rotational power can be achieved through a gear transmission method. The specific form of the driving device is not limited in this disclosure.

[0029] For a ball mill, the filling rate of the steel balls inside it is one of the key factors determining the crushing force and effect. To achieve convenient adjustment of the steel ball filling rate, a storage box 2 is adaptively joined to the outside of the cylinder 1 in this disclosure. The opening of the storage box 2 is set towards the side of the cylinder 1, and a communication port 3 is provided on the inner cavity wall of the cylinder 1. As will be described below, when the opening of the storage box 2 is opposite to the communication port 3, the steel balls will enter the storage box 2 under the action of centrifugal force or gravity, thereby reducing the steel ball filling rate inside the cylinder 1. In the subsequent situation, the steel balls will fall back into the cylinder 1 under the action of gravity, thereby increasing the steel ball filling rate inside the cylinder 1.

[0030] However, in order to stably hold the steel balls in the storage box 2, the opening of the storage box 2 adapted in this disclosure can be switched between open and closed states. And this makes this disclosure have at least the following modes:

[0031] Storage mode. In the storage mode, the opening of the storage box 2 is opened, and the grinding media inside the cylinder 1 enter the storage box 2 through the communication port 3, and then the opening of the storage box 2 is closed again. At this time, the steel balls are stably held in the storage box 2, and a lower steel ball filling rate is maintained inside the cylinder 1;

[0032] Discharge mode. In the discharge mode, the opening of the storage box 2 is opened again, and the grinding media inside the storage box 2 re-enter the inner cavity of the cylinder 1 through the communication port 3. At this time, the steel ball filling rate inside the cylinder 1 increases again.

[0033] In some embodiments, a connecting sleeve 4 is adaptively sleeved outside the cylinder 1, and the storage box 2 is provided on the connecting sleeve 4. Thus, the communication port 3 of the cylinder 1 can be covered by the inner wall of the connecting sleeve 4, which enables the communication port 3 to maintain a simpler open structure without additionally arranging an opening and closing device inside the communication port 3. But when the cylinder 1 rotates to make the communication port 3 opposite to the storage box 2, the steel balls inside the cylinder 1 can enter the storage box 2 through the communication port 3 and the opening of the storage box 2 as expected.

[0034] As Figure 1 、 Figure 2 shown, in a preferred example, the storage box 2 is fixedly arranged and is particularly adapted to be at least partially located in the lifting area of the steel balls in the circumferential direction. It can be understood that as the cylinder 1 rotates, the steel balls inside it will experience a lifting stage and a falling stage, and the term "lifting area" corresponds to the movement range of the steel balls in space during the lifting stage.

[0035] For example, an opening and closing plate 5 is provided at the opening of the material storage box 2, and a driving mechanism is also provided on the material storage box 2. Driven by the driving mechanism, the opening and closing plate 5 can open and close the opening of the material storage box 2 in a corresponding motion. In a possible situation, the opening and closing plate 5 can be opened or closed by withdrawing or inserting it laterally.

[0036] In the operating state where the steel ball filling rate does not need to be adjusted, the storage box 2 is empty and the opening and closing plate 5 remains closed. The cylinder 1 rotates in the connecting sleeve 4, so that the steel balls continuously impact and crush the materials in the cylinder 1;

[0037] When the steel ball filling rate needs to be reduced, the opening and closing plate 5 enters the open position. As the cylinder 1 rotates, the communication port 3 gradually approaches the storage box 2 until the steel balls in the cylinder 1 enter the storage box 2 under the action of centrifugal force. Then the opening and closing plate 5 re-enters the closed position, thereby retaining some steel balls in the storage box 2.

[0038] When the steel ball filling rate needs to be improved, the opening and closing plate 5 enters the open position. Subsequently, the steel balls in the storage box 2 will fall into the cylindrical body 1 again under the effect of gravity.

[0039] In a specific example, the opening and closing plate 5 may include a first opening and closing unit 6 and a second opening and closing unit 7 that are opposed to each other, and along the lifting direction of the steel ball, the first opening and closing unit 6 is adapted to be located at the front end of the second opening and closing unit 7. More specifically, the first opening and closing unit 6 is located within the lifting area of the steel ball in the circumferential direction, while the second opening and closing unit 7 is staggered from the lifting area of the steel ball in the circumferential direction.

[0040] It can be imagined that according to the respective actions of the first opening and closing unit 6 and the second opening and closing unit 7, the opening of the storage box 2 can form a ball inlet 20 and a ball outlet 21. Corresponding to the storage mode, the ball inlet 20 can be controlled to be in an open state, while the ball outlet 21 remains closed, so that the steel balls in the cylinder 1 can be stored into the storage box 2 through the ball inlet 20; corresponding to the discharge mode, the ball outlet 21 can be controlled to be in an open state, while the ball inlet 20 remains closed, so that the steel balls in the storage box 2 can fall into the cylinder 1 through the ball outlet 21.

[0041] For example, the top surface of the opening and closing plate 5 can be adapted to have a certain slope, and this slope helps guide the steel balls in the storage box 2 to be discharged from the ball outlet 21 under the action of gravity. Specifically, the first opening and closing unit 6 and the second opening and closing unit 7 can be rotatably adapted in the storage box 2. In this case, the driving source of the driving mechanism can be a motor, and the rotational power of the motor drives the first opening and closing unit 6 and the second opening and closing unit 7 to rotate and realize the expected opening and closing actions of the ball inlet 20 and the ball outlet 21.

[0042] For the second opening and closing unit 7, the opening and closing action of this rotation method enables it to rotate between the open position and the closed position. According to the different rotation angles, the angle for guiding the steel balls to discharge from the storage box 2 also changes accordingly. Based on this change, the position where the steel balls fall to the bottom of the cylinder 1 will also change, which is more conducive to the falling steel balls hitting and crushing the materials at different positions.

[0043] The ball mill disclosed herein also has the following modes:

[0044] Crushing mode. In the crushing mode, both the first opening and closing unit 6 and the second opening and closing unit 7 are in the open state. This mode can be carried out immediately after the above-mentioned discharging mode, that is, on the basis of the discharging mode, control the first opening and closing unit 6 to be in the open state. At this time, the steel balls in the cylinder 1 will enter the storage box 2, and the steel balls entering the storage box 2 will impact the steel balls in the storage box 2, which will cause the steel balls in the storage box 2 to be knocked out of the storage box 2 from the ball outlet 21. At this time, the steel balls will obtain greater kinetic energy than free fall, thus having a better impact and crushing effect on the materials in the cylinder 1.

[0045] The crushing mode is particularly suitable for the preliminary crushing of materials. In this mode, the rotation speed of the cylinder 1 can be controlled to increase, so as to increase the impact force of the steel balls entering the storage box 2, and then make the steel balls knocked out of the storage box 2 have greater kinetic energy. After the preliminary crushing is completed, the rotation speed of the cylinder 1 can be controlled to decrease, and it enters the normal use state of crushing and grinding the materials.

[0046] Such as Figure 3 、 Figure 4 As shown, as another solution, the connecting sleeve 4 is adapted to be rotatably arranged, that is, the circumferential position of the storage box 2 can change with the rotation of the connecting sleeve 4. Thus, the way of the steel balls entering and leaving the storage box 2 in this example also changes accordingly. For example, in the above-mentioned material storage mode, the connecting sleeve 4 can be controlled to rotate and make the storage box 2 located at the bottom of the cylinder 1. At this time, the steel balls in the cylinder 1 can fall into the storage box 2 under the action of gravity. Compared with the way of entering the balls by centrifugal force, this way reduces the requirement for the rotation speed of the cylinder ;while in the above-mentioned discharging mode, the connecting sleeve 4 can be controlled to rotate and make the storage box 2 located at the top of the cylinder 1. At this time, the steel balls in the storage box 2 can fall back into the cylinder 1 under the action of gravity.

[0047] In addition, in order to keep the steel ball filling rate in the cylinder 1 constant, the connecting sleeve 4 can be controlled to rotate synchronously with the cylinder 1. During this period, the communication port 3 between the outlet of the storage box 2 and the cylinder 1 will remain in a misaligned state, so that the inner cavity of the storage box 2 is stably isolated from the inner cavity of the cylinder 1. It can be understood that in this example, the cylinder 1 undertakes the function of opening and closing the opening of the storage box 2, which reduces the structural complexity of the storage box 2 to a certain extent.

[0048] For example, the rotation of the connecting sleeve 4 can be achieved through power transmission of a motor and a gear set.

[0049] In a preferred embodiment, a liquid cooling space 8 is defined between the cylinder 1 and the connecting sleeve 4, and a liquid spray port 13 is provided on the cylinder 1, connected to the liquid cooling space 8. Through the liquid spray port 13, coolant, such as water, in the liquid cooling space 8 can be sprayed into the cylinder 1, thereby directly cooling the inner wall of the cylinder 1 and the steel balls therein.

[0050] For example, a water tank 22 can be installed on the connecting sleeve 4 to replenish the liquid cooling space 8. Preferably, the water tank 22 and the storage box 2 are symmetrically arranged, which helps to maintain the dynamic balance of the connecting sleeve 4. Alternatively, a jacket ring (not shown) can be installed on the connecting sleeve 4, with the water inlet on the connecting sleeve 4 exposed within the jacket ring. This ensures that even if the connecting sleeve 4 rotates, the water inlet remains within the jacket ring and can absorb water.

[0051] In practice, it's undesirable to continuously inject coolant into the cylinder 1, as this could result in excessively high moisture content in the material. A possible approach is to install a pump (not shown) on the connecting sleeve 4 to pump the water out of the liquid-cooling space 8 through the liquid spray port 13. When the pump is not operating, the water remains within the liquid-cooling space 8. However, this increases the complexity of ball mill control, requiring, for example, the timing of pump activation. Furthermore, the amount of water pumped in at a time cannot be adaptively adjusted based on the actual operating conditions of the ball mill, often relying on manual settings of the pump's activation time or power level.

[0052] In response to the above problems, in the present disclosure, a gravity plate 9 is slidably provided at the inner end surface of the storage box 2. For example, the gravity plate 9 specifically includes a plate body and a sealing portion 18 provided on the plate body. A pump liquid cavity 19 is opened on the inner end surface of the storage box 2, and the sealing portion 18 is sealingly slidably adapted in the pump liquid cavity 19.

[0053] Furthermore, the interior of the storage box 2 is provided with a pump liquid channel 10, which, viewed in cross-section, is shaped like a "冂" (a curved line) and flows through the aforementioned pump liquid chamber 19. The interior of the barrel 1 also includes a liquid inlet channel 11, which communicates with the liquid cooling space 8, and a liquid outlet channel 12, which communicates with the liquid cooling space 8. Both ends of the pump liquid channel 10 are connected to the outer wall of the barrel 1; the ends of the liquid inlet channel 11 and the liquid outlet channel 12, which are away from the liquid cooling space 8, are connected to the outer wall of the barrel 1.

[0054] A one-way valve one 14, a one-way valve two 15, and a one-way valve three 16 are respectively arranged in the liquid inlet channel 11, the liquid outlet channel 12, and the liquid spraying port 13. Among them, the one-way valve one 14 is adapted to allow the fluid to flow toward the pump liquid channel 10 side, the one-way valve two 15 is adapted to allow the fluid to flow toward the liquid cooling space 8 side, and the one-way valve three 16 is adapted to allow the fluid to flow toward the inner cavity side of the cylinder body 1. Based on this, the ball mill disclosed in this disclosure also has the following modes:

[0055] Pump liquid mode: The connecting sleeve 4 rotates and makes both ends of the pump liquid channel 10 communicate with the liquid inlet channel 11 and the liquid outlet channel 12 respectively. At this time, the inner cavity of the storage box 2 is isolated from the inner cavity of the cylinder body 1. Subsequently, the connecting sleeve 4 is controlled to rotate synchronously with the cylinder body 1. Under the action of gravity, the gravity plate 9 in the storage box 2 will slide radially back and forth.

[0056] When the storage box 2 rotates to the bottom of the cylinder body 1, the gravity plate 9 slides radially outward. At this time, the sealing part 18 can pump the water in the pump liquid cavity 19 out from the liquid outlet channel 12, thereby forcing the water in the liquid cooling space 8 to be pumped out from the one-way valve three 16;

[0057] When the storage box 2 rotates to the top of the cylinder body 1, the gravity plate 9 slides radially inward. At this time, the sealing part 18 releases the space in the pump liquid cavity 19 again, and the water in the liquid cooling space 8 can be pumped into the pump liquid cavity 19 through the liquid inlet channel 11. In this way, the intermittent pumping of the water in the liquid cooling space 8 is realized.

[0058] In a preferred example, a stop baffle 17 for restricting the sliding stroke of the gravity plate 9 is also slidably arranged in the storage box 2. It can be understood that as the steel balls enter the storage box 2 in the material storage mode, the steel balls will push the stop baffle 17 to continuously approach the gravity plate 9. When the storage box 2 is empty, since the stop baffle 17 is not blocked, it will also slide radially under the action of gravity, which will allow the gravity plate 9 to have a maximum sliding stroke and can realize a large amount of water pumping action at one time.

[0059] In the material storage mode, since some of the steel balls are stored in the storage box 2, the friction situation between the steel balls in the cylinder body 1 will be slowed down due to the reduction of the number of steel balls, and the corresponding heat dissipation requirement will also be reduced. Under the stop of the stop baffle 17, the sliding stroke of the gravity plate 9 is reduced, and a small amount of water pumping action can be realized at one time.

[0060] On the one hand, this disclosure cleverly uses the cooperation of the gravity plate 9 and the connecting sleeve 4 to realize the controllable and intermittent pumping of water in the liquid cooling space 8. On the other hand, it can adaptively change the pumping stroke of the gravity plate 9 according to the different material storage modes and discharging modes of the ball mill, so that the cylinder body 1 can be cooled more specifically and it is not easy to cause waste of water resources.

[0061] The above are only the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein, and should not be regarded as excluding other embodiments. Instead, it can be used in various other combinations, modifications, and environments, and can be changed within the scope of the concept described herein through the above teachings or the technology or knowledge in the relevant field. Any changes and variations made by those skilled in the art without departing from the spirit and scope of the present invention shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A ball mill for mining, comprising a rotatably arranged cylinder body (1), characterized in that: A storage box (2) is joined to the outside of the cylinder body (1). A communication port (3) is formed on the inner cavity wall of the cylinder body (1). The opening of the storage box (2) is adapted to be switched between open and closed states. By controlling the opening and closing of the opening of the storage box (2), the ball mill has at least the following modes: Stock storage mode: In the stock storage mode, the opening of the storage box (2) is opened, and the grinding media in the cylinder body (1) enter the storage box (2) through the communication port (3), and then the opening of the storage box (2) is closed again. Discharge mode: In the discharge mode, the opening of the storage box (2) is opened again, and the grinding media in the storage box (2) re-enter the inner cavity of the cylinder body (1) through the communication port (3). At least a part of the storage box (2) is located in the lifting area of the grinding media in the circumferential direction. An opening and closing plate (5) is arranged at the opening of the storage box (2), and a driving mechanism is further arranged on the storage box (2). The driving mechanism is used to drive the opening and closing plate (5) to open and close the opening of the storage box (2). The opening and closing plate (5) includes opposed first opening and closing units (6) and second opening and closing units (7). Along the lifting direction of the grinding media, the first opening and closing unit (6) is located at the front end of the second opening and closing unit (7). In the stock storage mode, the first opening and closing unit (6) is in an open state, and the second opening and closing unit (7) is in a closed state. In the discharge mode, the first opening and closing unit (6) is in a closed state, and the second opening and closing unit (7) is in an open state.

2. The coal mill according to claim 1, characterized in that: A connecting sleeve (4) is sleeved outside the cylinder body (1), and the storage box (2) is arranged on the connecting sleeve (4).

3. The coal mill according to claim 1, characterized in that: The first opening and closing unit (6) is located in the lifting area of the grinding media in the circumferential direction, and the second opening and closing unit (7) is offset from the lifting area of the grinding media in the circumferential direction.

4. The coal mill according to claim 1, characterized in that: The ball mill also has the following mode: Crushing mode: In the crushing mode, both the first opening and closing unit (6) and the second opening and closing unit (7) are in an open state, so that the grinding media in the cylinder body (1) knock out the grinding media in the storage box (2).

5. The coal mill according to claim 3 or 4, characterized in that: The second opening and closing unit (7) is adapted to be able to rotate between an open position and a closed position, thereby changing the discharge angle of the grinding media.

6. The coal mill according to claim 2, characterized in that: The connecting sleeve (4) is rotatably arranged. In the stock storage mode, the connecting sleeve (4) rotates to make the storage box (2) located at the bottom of the cylinder body (1). In the discharge mode, the connecting sleeve (4) rotates to make the storage box (2) located at the top of the cylinder body (1).

7. The coal mill according to claim 6, characterized in that: A liquid cooling space (8) is defined between the cylinder body (1) and the connecting sleeve (4). A gravity plate (9) is slidably arranged at the inner end face of the storage box (2). A liquid pumping flow channel (10) is formed in the storage box (2). The cross section of the liquid pumping flow channel (10) is in an "n" shape. An inlet liquid flow channel (11) communicating with the liquid cooling space (8) is formed in the cylinder body (1). An outlet liquid flow channel (12) communicating with the liquid cooling space (8) is further formed in the cylinder body (1). A liquid spraying port (13) communicating with the liquid cooling space (8) is formed in the cylinder body (1). A check valve one (14) is arranged in the inlet liquid flow channel (11). The check valve one (14) is adapted to allow the fluid to flow towards the liquid pumping flow channel (10). A check valve two (15) is arranged in the outlet liquid flow channel (12). The check valve two (15) is adapted to allow the fluid to flow towards the liquid cooling space (8). A check valve three (16) is arranged in the liquid spraying port (13). The check valve three (16) is adapted to allow the fluid to flow towards the inner cavity of the cylinder body (1). A stop baffle (17) for limiting the sliding stroke of the gravity plate (9) is further slidably arranged in the storage box (2). The gravity plate (9) includes a sealing part (18). A liquid pumping cavity (19) is formed in the inner end face of the storage box (2). The sealing part (18) is hermetically and slidably arranged in the liquid pumping cavity (19). The liquid pumping flow channel (10) is adapted to flow through the liquid pumping cavity (19). The ends of the inlet liquid flow channel (11) and the outlet liquid flow channel (12) far from the liquid cooling space (8) are both communicated with the outer wall of the cylinder body (1). The two ends of the liquid pumping flow channel (10) are both communicated with the inner wall of the connecting sleeve (4). The ball mill further has the following modes: Liquid pumping mode. In the liquid pumping mode, the connecting sleeve (4) rotates to enable the two ends of the liquid pumping flow channel (10) to be respectively communicated with the inlet liquid flow channel (11) and the outlet liquid flow channel (12), and then the connecting sleeve (4) and the cylinder body (1) are controlled to rotate synchronously.

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