Mining ball mill

Abstract

The invention discloses a mining ball mill which comprises a rotatably arranged cylinder, the outer side of the cylinder is connected with a storage box, a communicating port is formed in the inner cavity wall of the cylinder, an opening of the storage box is matched to be opened and closed in a switchable mode, and the opening and closing of the opening of the storage box are controlled. When the filling rate of the steel balls needs to be reduced, the ball mill can be controlled to enter a material storage mode, and the steel balls can be filled and kept in the material storage box, so that the number of the steel balls in the barrel is reduced; and when the filling rate of the steel balls needs to be improved, the ball mill can be controlled to enter a discharging mode, and the steel balls fall out of the storage box, so that the number of the steel balls in the barrel is increased. Compared with the prior art, the storage box is connected to the outer side of the barrel, steel balls in the barrel can be conveniently taken out and put in by controlling opening and closing of the opening of the storage box, the ball mill does not need to be shut down in the period, and high operation efficiency is achieved.

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 obliquely placed 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, achieving 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 a ball mill is the filling rate of steel balls. If the filling rate of 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 steel balls is too high, the materials will be crushed to an undesired too small particle size.

[0004] However, the existing ball mills have relatively inconvenient ways to adjust the number of steel balls. For example, generally, it is necessary to stop the machine and manually take out or put in steel balls, resulting in a reduction in operation 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: 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 switched between open and closed states. By controlling the opening and closing 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.

[0007] Preferably, a connecting sleeve is sleeved outside the barrel, and the storage box is arranged on the connecting sleeve.

[0008] Preferably, the storage box is at least partially located in the lifting area of the grinding media in the circumferential direction.

[0009] Preferably, an opening and closing plate is arranged at the opening of the storage box, and a driving mechanism is further arranged 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.

[0010] Preferably, the opening and closing plate includes opposed first 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.

[0011] Preferably, the first opening and closing unit is located within 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.

[0012] Preferably, the ball mill further has the following mode: a crushing mode. In the crushing mode, both the first opening and closing unit and the second opening and closing unit are in an open state, so that the grinding media in the cylinder body knock out the grinding media in the storage box.

[0013] Preferably, the second opening and closing unit is adapted to be rotatable between an open position and a closed position, thereby changing the discharging angle of the grinding media.

[0014] Preferably, the connecting sleeve is rotatably arranged; in the material storage mode, the connecting sleeve rotates to place the storage box at the bottom of the cylinder body; in the discharging mode, the connecting sleeve rotates to place the storage box at the top of the cylinder body.

[0015] Preferably, a liquid cooling space is defined between the cylinder body 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 in a "冂" shape, a liquid inlet flow channel connected to the liquid cooling space is provided in the cylinder body, a liquid outlet flow channel connected to the liquid cooling space is also provided in the cylinder body, and a liquid spray port connected to the liquid cooling space is provided on the cylinder body; a one-way valve 1 is provided in the liquid inlet flow channel, and the one-way valve 1 is adapted to allow 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 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 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 arranged 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 arranged in the pump liquid cavity; the pump liquid flow channel is adapted to flow through the pump liquid cavity, and the ends of the inlet flow channel and the 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: a pump liquid mode, in which the connecting sleeve rotates and makes the two ends of the pump liquid flow channel connected to the inlet flow channel and the outlet flow channel respectively, and then the connecting sleeve is controlled to rotate synchronously with the cylinder.

[0016] The beneficial effects of the present invention are: 1. When the filling rate of steel balls needs to be reduced, the ball mill can be controlled to enter the storage mode, and the steel balls can be filled and kept in the storage box, so that the number of steel balls in the cylinder is reduced; and when the filling rate of steel balls 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, so that the number of steel balls in the cylinder is increased. Compared with the prior art, the present invention is connected with a storage box on the outside of the cylinder, and the steel balls in the cylinder can be conveniently taken out and put in by opening and closing the opening of the storage box, and the ball mill does not need to be stopped during the period, which has a higher operating efficiency.

[0017] 2. In the storage mode, the steel balls are automatically thrown into the storage box by centrifugal force, and as the opening of the storage box is closed again, 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.

[0018] 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 material storage box from the first opening and closing unit under the action of centrifugal force, and the steel balls entering the material storage box will impact the steel balls in the material storage box, which will cause the steel balls in the material storage box to be knocked out of the material storage box from the second opening and closing unit. At this time, the steel balls will obtain greater kinetic energy than free fall, thereby having a better impact and crushing effect on the materials in the cylinder. Brief Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of an embodiment; Figure 2 It is a schematic structural diagram of the opening and closing plate; Figure 3 It is a schematic structural diagram of another embodiment; Figure 4 It is a schematic structural diagram of the gravity plate.

[0020] Reference Numerals: 1, cylinder body; 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 Embodiment

[0021] 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 of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0022] As Figures 1 to 4 shown, a mining ball mill includes a hollow cylinder body 1. For example, both ends of the cylinder body 1 are respectively configured as a feed port and a discharge port. Materials enter the cylinder body 1 through the feed port, and the cylinder body 1 rotates under the drive of a driving device (not shown in the figure). At this time, the steel balls in the cylinder body 1 will be lifted under the action of centrifugal force until they fall back to the bottom of the cylinder body 1 again. The materials are crushed 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.

[0023] And there are various driving devices for driving the rotation of the cylinder body 1 disclosed in the prior art. For example, the transmission of rotational power can be achieved by means of gear transmission. The specific form of the driving device is not limited in this disclosure.

[0024] 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 body 1 in this disclosure. The opening of the storage box 2 is arranged towards the side of the cylinder body 1, and a communication port 3 is arranged on the inner cavity wall of the cylinder body 1. As will be described below, when the opening of the storage box 2 faces 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 in the cylinder body 1. In the subsequent situation, the steel balls will fall back into the cylinder body 1 under the action of gravity, thereby increasing the steel ball filling rate in the cylinder body 1.

[0025] However, in order to stably hold the steel balls in the storage box 2, the opening of the storage box 2 in this disclosure can be switched between open and closed states. And this makes this disclosure have at least the following modes: Storage mode. In the 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. At this time, the steel balls are stably held in the storage box 2, and a lower steel ball filling rate is maintained in the cylinder body 1; Discharging mode. In the discharging 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 this time, the steel ball filling rate in the cylinder body 1 increases again.

[0026] In some embodiments, a connecting sleeve 4 is adaptively sleeved outside the cylinder body 1, and the storage box 2 is arranged on the connecting sleeve 4. Thus, the communication port 3 of the cylinder body 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 body 1 rotates to make the communication port 3 face the storage box 2, the steel balls in the cylinder body 1 can enter the storage box 2 through the communication port 3 and the opening of the storage box 2 as expected.

[0027] As Figure 1 、 Figure 2 shown, in a preferred example, the storage box 2 is fixedly arranged, and it 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 body 1 rotates, the steel balls inside it will go through a lifting stage and a falling-back stage, and the term "lifting area" corresponds to the movement range of the steel balls in space during the lifting stage.

[0028] For example, an opening and closing plate 5 is arranged at the opening of the storage box 2, and a driving mechanism is also arranged on the storage box 2. Driven by the driving mechanism, the opening and closing plate 5 can open and close the opening of the storage box 2 in a corresponding movement form. In a possible situation, the opening and closing plate 5 can open or close the opening of the storage box 2 by being laterally pulled out or inserted.

[0029] In the running state where the steel ball filling rate does not need to be adjusted, the material storage box 2 is empty and the opening and closing plate 5 remains in a closed position. The cylinder 1 rotates in the connecting sleeve 4, so that the steel balls continuously impact and crush the materials in the cylinder 1; 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 material storage box 2 until the steel balls in the cylinder 1 enter the material storage box 2 under the action of centrifugal force, and then the opening and closing plate 5 re-enters the closed position, thereby keeping some steel balls in the material storage box 2; When the steel ball filling rate needs to be increased, the opening and closing plate 5 enters the open position. Subsequently, the steel balls in the storage box 2 will fall back into the cylinder 1 under the effect of gravity.

[0030] 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 opposite 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 in the lifting area of ​​the steel ball in the circumferential direction, and the second opening and closing unit 7 is staggered from the lifting area of ​​the steel ball in the circumferential direction.

[0031] 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 material storage box 2 can form a ball inlet 20 and a ball outlet 21. Corresponding to the material 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 in the material storage box 2 through the ball inlet 20; corresponding to the material 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 material storage box 2 can fall into the cylinder 1 through the ball outlet 21.

[0032] For example, the top surface of the opening and closing plate 5 can be adapted to have a certain slope, and the slope helps to 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. At this time, the driving source of the driving mechanism can be a motor, and the rotational power of the motor can be used to drive 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.

[0033] For the second opening and closing unit 7, this rotational opening and closing action enables it to rotate between the open position and the closed position, and according to the different rotation angles, the angle for guiding the steel balls to discharge 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 to impact and crush materials at different positions.

[0034] The ball mill disclosed herein also has the following modes: 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 follow 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.

[0035] The crushing mode is especially 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 crushing and grinding use state of the materials.

[0036] 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 1; 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.

[0037] In addition, in order to keep the filling rate of the steel balls 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 and the inner cavity of the cylinder 1 are stably isolated. 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.

[0038] For example, the rotation of the connecting sleeve 4 can be realized through the power transmission of a motor and a gear set.

[0039] In a preferred example, a liquid cooling space 8 is defined and adapted between the cylinder 1 and the connecting sleeve 4, and a liquid spraying port 13 communicating with the liquid cooling space 8 is also opened on the cylinder 1. Through the liquid spraying port 13, the coolant such as water in the liquid cooling space 8 can be sprayed into the cylinder 1, so as to directly cool the inner wall of the cylinder 1 and the steel balls inside it.

[0040] For example, the water source of the liquid cooling space 8 can be replenished by arranging the water tank 22 on the connecting sleeve 4. Preferably, the water tank 22 and the material storage box 2 are symmetrically arranged, which helps to a certain extent with the dynamic balance of the connecting sleeve 4. Alternatively, a jacket ring (not shown in the figure) can be arranged on the connecting sleeve 4, and the water inlet on the connecting sleeve 4 is exposed inside the jacket ring, so that even if the connecting sleeve 4 rotates, the water inlet can always be located inside the jacket ring and draw water.

[0041] Actually, it is not desirable for the cooling liquid to continuously enter the cylinder body 1, because this may lead to too high moisture content of the material. Among possible solutions, a pump (not shown in the figure) can be arranged on the connecting sleeve 4 to pump the water in the liquid cooling space 8 out from the liquid spraying port 13, and when the pump is not operating, the water is kept in the liquid cooling space 8. However, this will increase the control complexity of the ball mill, such as the need to control the starting time of the pump. At the same time, the amount of water pumped in each time cannot be adaptively adjusted according to the actual operating conditions of the ball mill, which often depends on manual setting of the starting time or power of the pump.

[0042] To address the above problems, in this disclosure, a gravity plate 9 is slidably arranged at the inner end face of the material storage box 2. For example, the gravity plate 9 specifically includes a plate body and a sealing portion 18 arranged on the plate body, and a liquid pumping cavity 19 is formed on the inner end face of the material storage box 2, and the sealing portion 18 is sealingly and slidably fitted in the liquid pumping cavity 19.

[0043] In addition, a liquid pumping flow channel 10 is formed inside the material storage box 2. In terms of cross-section, the liquid pumping flow channel 10 is in an inverted U shape and flows through the above-mentioned liquid pumping cavity 19. An inlet liquid flow channel 11 communicating with the liquid cooling space 8 and an outlet liquid flow channel 12 communicating with the liquid cooling space 8 are also formed inside the cylinder body 1. Among them, both ends of the liquid pumping flow channel 10 communicate with the outer wall of the cylinder body 1; the ends of the inlet liquid flow channel 11 and the outlet liquid flow channel 12 far from the liquid cooling space 8 communicate with the outer wall of the cylinder body 1.

[0044] One-way valves 14, 15, and 16 are respectively arranged in the inlet liquid flow channel 11, the outlet liquid flow channel 12, and the liquid spraying port 13. Among them, the one-way valve 14 is adapted to allow the fluid to flow towards the liquid pumping flow channel 10 side, the one-way valve 15 is adapted to allow the fluid to flow towards the liquid cooling space 8 side, and the one-way valve 16 is adapted to allow the fluid to flow towards the inner cavity side of the cylinder body 1. Based on this, the ball mill of this disclosure also has the following modes: Liquid pumping mode: The connecting sleeve 4 rotates to make both ends of the liquid pumping flow channel 10 communicate with the inlet liquid flow channel 11 and the outlet liquid flow channel 12 respectively. At this time, the inner cavity of the material storage box 2 is isolated from the inner cavity of the cylinder body 1. Subsequently, control the connecting sleeve 4 and the cylinder body 1 to rotate synchronously. Under the action of gravity, the gravity plate 9 in the material storage box 2 will slide reciprocally along the radial direction.

[0045] 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 moisture in the liquid pumping cavity 19 out through the liquid outlet channel 12, thereby forcing the moisture in the liquid cooling space 8 to be pumped out from the check valve III 16; 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 liquid pumping cavity 19 again, and the moisture in the liquid cooling space 8 can be pumped into the liquid pumping cavity 19 through the liquid inlet channel 11. In this way, the intermittent pumping of the moisture in the liquid cooling space 8 is realized.

[0046] 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.

[0047] In the material storage mode, since some of the steel balls are deposited 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 its corresponding heat dissipation requirement will also be reduced. Under the blocking 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.

[0048] 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 water 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 more targeted for heat dissipation and water resources are not easily wasted.

[0049] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but 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 related fields. And the changes and modifications made by those skilled in the art that do not depart from the spirit and scope of the present invention should all be 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: Stockpiling mode: In the stockpiling 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). Subsequently, the opening of the storage box (2) is closed again. Discharging mode: In the discharging 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).

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 or 2, characterized in that: The storage box (2) is located in the lifting area of the grinding media in the circumferential direction.

4. The coal mill according to claim 3, characterized in that: 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).

5. The ball mill for mines according to claim 4, characterized in that: 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 stockpiling mode, the first opening and closing unit (6) is in the open state, and the second opening and closing unit (7) is in the closed state. In the discharging mode, the first opening and closing unit (6) is in the closed state, and the second opening and closing unit (7) is in the open state.

6. The coal mill according to claim 5, 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.

7. The coal mill according to claim 5, 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 the open state, so that the grinding media in the cylinder body (1) knock out the grinding media in the storage box (2).

8. The ball mill for mines according to any one of claims 5 to 7, 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 discharging angle of the grinding media.

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

10. The coal mill according to claim 9, 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 first one-way valve (14) is arranged in the inlet liquid flow channel (11). The first one-way valve (14) is adapted to allow fluid to flow towards the liquid pumping flow channel (10). A second one-way valve (15) is arranged in the outlet liquid flow channel (12). The second one-way valve (15) is adapted to allow fluid to flow towards the liquid cooling space (8). A third one-way valve (16) is arranged in the liquid spraying port (13). The third one-way valve (16) is adapted to allow 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 portion (18). A liquid pumping cavity (19) is formed in the inner end face of the storage box (2). The sealing portion (18) is sealingly 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). Both ends of the liquid pumping flow channel (10) are 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 make both ends of the liquid pumping flow channel (10) communicate with the inlet liquid flow channel (11) and the outlet liquid flow channel (12) respectively, and then the connecting sleeve (4) and the cylinder body (1) are controlled to rotate synchronously.

Images