External driving center continuous feeding structure and discharging structure of ball mill with over-limit rotating speed
By setting up push and reverse push structures in the hollow shaft of the feed and discharge of the ball mill, the problem of material wall attachment is solved, continuous production and efficient inlet and discharge of the ball mill are achieved at ultra-limit speed, and the production efficiency and stability of the ball mill are improved.
Patent Information
- Application Number
- CN202421548625.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-07-02
AI Technical Summary
When traditional ball mills are above the limit speed, materials are prone to walls when entering and exiting the hollow shaft, resulting in difficulty in entering and exiting the material and affecting the stability and efficiency of continuous production.
A feed push structure is provided in the feed hollow shaft, and a reverse push structure is provided in the discharge hollow shaft. The feed and discharge center shafts are driven respectively by the first and second rotary driving devices to realize continuous and reverse push of materials to avoid wall attachment.
It solves the problem of wall attachment of ball mills above the limit speed, ensures continuous production, improves production efficiency, and reduces the risk of wear and blockage of the inlet and outlet structures.
Smart Images
Figure CN223128190U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of industrial powder preparation, in particular to an external drive center continuous feeding structure and a discharging structure of an ultra-limit speed ball mill applicable to dry powder production, especially an external drive center continuous feeding structure and a discharging structure of an ultra-limit speed ball mill applicable to dry ultra-fine powder production. Background Art
[0002] A ball mill is a basic mechanical grinding equipment, which is widely used in industries such as metallurgy, building materials, and chemical industry, especially in the grinding production of metallurgical ore dressing and building materials cement. The main reasons for the wide application of ball mills are as follows: First, excellent grinding performance, with the powder particle materials being nearly spherical and the particle size distribution being reasonable; Second, stable and reliable continuous operation; Third, large single-machine production capacity.
[0003] Since when the rotational speed of the cylinder reaches or exceeds the limit speed, the grinding media and the material will remain relatively stationary with the cylinder and rotate together, resulting in an "adhering to the wall" motion state, which causes the material and the grinding media in the ball mill not to collide and impact each other. Therefore, the rotational speed of the rotating cylinder of a traditional ball mill is lower than the limit (critical) speed (the rotational speed of the rotating cylinder is generally designed at 70-80% of the critical speed). For a traditional ball mill with central feeding and discharging, the effective diameters of the feeding hollow shaft and the discharging hollow shaft are smaller than the effective diameter of the rotating cylinder. According to the limit (critical) speed formula n = 424 / √d (revolutions per minute, where d is the effective inner diameter in cm), the limit (critical) speed of the feeding hollow shaft and the discharging hollow shaft is higher than that of the rotating cylinder. Therefore, there is no problem of the material and the grinding media adhering to the wall for the feeding hollow shaft and the discharging hollow shaft. Limited by the limit speed, the production efficiency of traditional ball mills is low. Therefore, how to solve the problem of the wall adhesion caused by breaking through the limit speed of the ball mill and make the ball mill not be limited by the limit speed is the key to improving the production efficiency of the ball mill.
[0004] With the progress of technology, it has become possible to improve the efficiency of the ball mill by modifying the ball mill to break through the limit speed limit of the ball mill. For example: Figure 1As shown in the figure, the applicant has designed a ball mill with central feeding and discharging, which includes a frame 1 and a cylinder 2. One end of the cylinder 2 is provided with a feeding hollow shaft 21, and the other end is provided with a discharging hollow shaft 22. The cylinder 2 is rotatably installed on the frame 1 so that the cylinder 2 can rotate around its own axis; it also includes at least one impact mechanism 3 installed in the cylinder 2 and arranged around the axis of the cylinder 2 to revolve around the axis of the cylinder 2 with the cylinder 2. The impact mechanism 3 includes a planetary shaft 31. The planetary shaft 31 is arranged along the axis direction of the cylinder 2. The planetary shaft 31 is rotatably connected to the cylinder 2 so that the planetary shaft 31 can rotate around its own axis, that is, rotate self - rotatably. An impact plate 33 for scraping the wall - adhering materials in the cylinder 2 is provided on the planetary shaft 31. In the figure, the planetary shaft 31 is driven by a fixed gear 4. The fixed gear 4 is arranged at one end of the cylinder 2 and is coaxially arranged with the cylinder 2. The fixed gear 4 is fixedly installed on the frame 1; one end of the planetary shaft 31 close to the fixed gear 4 extends out of the cylinder 2 and is provided with a planetary gear 5 meshing with the fixed gear 4 to drive the planetary shaft 31 to rotate around its own axis. During the rotation of the cylinder of this ball mill, while driving the planetary shaft 31 to rotate around the axis of the cylinder 2, it realizes self - rotation around its own axis through the planetary gear 5 and the fixed gear 4. During the rotation of the planetary shaft 31, the impact plate 33 is driven to rotate together. During the rotation of the impact plate 33, the wall - adhering materials and grinding media in the trajectory area of the impact plate 33 are scraped and impacted, and the wall - adhering materials and grinding media in the nearby area are also impacted and removed, so as to eliminate the wall - adhering materials, make the materials and grinding media collide effectively in the cylinder 2, and realize pulverization at a speed exceeding the limit speed.
[0005] However, when the ball mill exceeds the limit speed, with the increase of the cylinder speed, especially when the feeding hollow shaft and the discharging hollow shaft of the cylinder exceed the limit speed, during the process of the material passing through the feeding hollow shaft and the discharging hollow shaft, the wall - adhering problem will also occur under the action of the cylinder rotation, resulting in difficult feeding and discharging during the operation of the ball mill, easy blockage of materials, and affecting the continuous production stability of the ball mill.
[0006] In order to eliminate the wall - adhering materials in the feeding hollow shaft and the discharging hollow shaft, it is easy to think of simply setting rotatable spiral pushing structures respectively in the feeding hollow shaft and the discharging hollow shaft that are rotationally matched with them. However, due to the still existing wall - adhering phenomenon, the materials will tightly adhere to the inner walls of the feeding hollow shaft and the discharging hollow shaft and accumulate under the action of centrifugal force. For central feeding, the friction between the material and the feeding hollow shaft will be very large, which will cause the spiral pushing structure to be difficult to push the material, and easily lead to problems such as wear and damage of the spiral pushing structure and the feeding hollow shaft; for central discharging, in addition to the problems of central feeding, there are also difficulties in separating and transporting coarse and fine materials. Utility Model Content
[0007] The technical problem to be solved by the utility model is to provide an external drive center continuous feeding structure and discharging structure of a super-limit speed ball mill, in which a feeding pushing structure is arranged in a feeding hollow shaft, a reverse pushing structure is arranged in a discharging hollow shaft, and the feeding pushing structure and the reverse pushing structure are convenient for flexible speed regulation, so as to solve the problem of material adhering to the wall when entering and exiting the ball mill after the ball mill exceeds the limit speed.
[0008] The technical solution adopted by the utility model to solve the technical problem is: an external drive center continuous feeding structure and a discharging structure of a super-limit speed ball mill, the ball mill comprises a frame and a cylinder, one end of the cylinder is provided with a feeding hollow shaft, the other end is provided with a discharging hollow shaft, the cylinder is rotatably mounted on the frame, the external drive center continuous feeding structure and the discharging structure comprise a first rotary drive device, a second rotary drive device, a feeding guide cylinder arranged in the feeding hollow shaft and rotatably matched with the feeding hollow shaft, and a discharging guide cylinder arranged in the discharging hollow shaft and rotatably matched with the discharging hollow shaft;
[0009] The outer end of the feed guide cylinder extends out the feed hollow shaft and is fixedly connected to the frame; a feed center shaft coaxial with the feed guide cylinder is provided inside the feed guide cylinder, the feed center shaft is rotatably installed inside the feed guide cylinder, and a feed pushing structure is provided on the feed center shaft, which cooperates with the inner wall of the feed guide cylinder to push the material in the feed guide cylinder into the cylinder body;
[0010] The outer end of the discharge guide cylinder extends out the discharge hollow shaft and is fixedly connected to the frame. The discharge guide cylinder is provided with a discharge center shaft coaxial therewith, and the discharge center shaft is rotatably installed in the discharge guide cylinder. The discharge center shaft is provided with a reverse pushing structure that cooperates with the inner wall of the discharge guide cylinder to push the sinking material in the discharge guide cylinder into the cylinder body.
[0011] The first rotary drive device is in driving connection with the feed center shaft, and the second rotary drive device is in driving connection with the discharge center shaft.
[0012] Furthermore, the feed pushing structure includes at least one feed spiral belt wound around the feed central axis, a distance is provided between the feed spiral belt and the feed central axis, and the feed spiral belt is fixed to the feed central axis via a first support.
[0013] Furthermore, the reverse pushing structure includes at least one reverse pushing spiral belt wound around the discharge center axis, a distance is provided between the reverse pushing spiral belt and the discharge center axis, and the reverse pushing spiral belt is fixed to the discharge center axis through a second support.
[0014] Further, a hollow first frustum transition section is provided between the feed hollow shaft and the inner cavity of the cylinder body. The inner cavity of the first frustum transition section is of a frustum-shaped structure, and the small end of the first frustum transition section is connected to the inner end of the feed hollow shaft.
[0015] Further, the taper angle of the first frustum transition section is greater than 80°, and preferably takes a value of 90°.
[0016] Further, a hollow second frustum transition section is provided between the inner cavity of the cylinder body and the discharge hollow shaft. The inner cavity of the second frustum transition section is of a frustum-shaped structure, and the small end of the second frustum transition section is connected to the inner end of the discharge hollow shaft.
[0017] Further, the taper angle of the second frustum transition section is greater than 80°, and preferably takes a value of 90°.
[0018] Further, an extension section of the feed spiral belt is provided at the inner end of the feed spiral belt, and the extension section of the feed spiral belt extends beyond the inner end of the feed guide cylinder. The length of the extension section of the feed spiral belt is preferably 10 - 20 mm.
[0019] Further, an extension section of the reverse push spiral belt is provided at the inner end of the reverse push spiral belt, and the extension section of the reverse push spiral belt extends beyond the inner end of the feed guide cylinder. The length of the extension section of the reverse push spiral belt is preferably 10 - 20 mm.
[0020] Further, a feed negative pressure sealing channel for introducing external air into the cylinder body is formed by the gap between the outer wall of the feed guide cylinder and the inner wall of the feed hollow shaft. The gap between the outer wall of the feed guide cylinder and the inner wall of the feed hollow shaft is preferably 2 - 3 mm;
[0021] A discharge negative pressure sealing channel for introducing external air into the cylinder body is formed by the gap between the outer wall of the discharge guide cylinder and the inner wall of the discharge hollow shaft. The gap between the outer wall of the discharge guide cylinder and the inner wall of the discharge hollow shaft is preferably 2 - 3 mm.
[0022] Further, an extension section of the feed is provided at the inner end of the feed guide cylinder, and the extension section of the feed extends beyond the inner end of the feed hollow shaft. The length of the extension section of the feed is preferably 5 - 10 mm.
[0023] Further, an extension section of the discharge is provided at the inner end of the discharge guide cylinder, and the extension section of the discharge extends beyond the inner end of the discharge hollow shaft. The length of the extension section of the discharge is preferably 5 - 10 mm.
[0024] Further, both the first rotation driving device and the second rotation driving device are servo motors.
[0025] The beneficial effects of the present utility model are mainly as follows:
[0026] The external drive center continuous feeding structure and discharging structure of the super-limit speed ball mill of the utility model are provided with a feeding guide cylinder 7 fixedly connected to the frame in the feeding hollow shaft 21, a feeding central shaft 71 drivingly connected to the first rotating drive device is provided in the feeding guide cylinder 7, a feeding central shaft 71 is provided with a feeding pushing structure, a discharging guide cylinder 8 fixedly connected to the frame is provided in the discharging guide cylinder 22, a discharging central shaft 81 drivingly connected to the second rotating drive device is provided in the discharging guide cylinder 8, and a reverse pushing structure is provided in the discharging central shaft 81. When the cylinder body rotates during operation, the feeding guide cylinder and the discharging guide cylinder will not rotate, so that the ball mill will not have the problem of feeding and discharging wall attachment, and the problem of feeding and discharging wall attachment is transformed into a simple problem of feeding and discharging accumulation. The problem is that the accumulated materials in the feed guide tube and the sunken accumulated materials in the discharge guide tube are pushed into the drum; and when the drum rotates during operation, the first rotation driving device can drive the feed pushing structure to rotate and push the materials in the feed guide tube 7 into the drum, and the second rotation driving device can drive the reverse pushing structure to rotate and push the materials sunk in the discharge guide tube 8 into the drum in the reverse direction; therefore, the utility model solves the problem of the material adhering to the wall when the mill exceeds the limit speed, especially when the limit speed of the feed hollow shaft and the discharge hollow shaft is exceeded, and can ensure the continuous production of the ball mill with a speed exceeding the limit, improve the production efficiency of the ball mill, and make the feeding and discharging of the ball mill more convenient, and the feeding and discharging structure is not easy to wear and damage;
[0027] The utility model adopts a method of separately setting a first rotary drive device 6 and a second rotary drive device 9 to drive the feed center shaft and the discharge center shaft to rotate, so as to flexibly adjust the rotation speed and rotation direction of the feed center shaft 71 and the discharge center shaft 81 and their associated components according to actual conditions; to facilitate the replacement of the vulnerable parts of the feed and discharge structure; and to facilitate the feed hollow shaft 21 and the feed hollow shaft 22 to become a maintenance channel for replacing vulnerable parts entering the cylinder 2;
[0028] The external drive central continuous feeding structure and discharging structure of the ultra-limit speed ball mill of the utility model are fixedly arranged with a feeding transition section 23 and a discharging transition section 24 of a frustum structure between the cylinder 2 and the feeding hollow shaft 21 and the discharging hollow shaft 22. The main gain effects are: increasing the structural strength of the cylinder 2, the feeding hollow shaft 21 and the discharging hollow shaft 22; shortening the length of components such as the feeding hollow shaft 21, the discharging hollow shaft 22, the feeding guide tube 7, the discharging guide tube 8, the feeding center shaft 71, the discharging center shaft 81, simplifying and facilitating manufacturing, and at the same time reducing the collision and wear of the central feeding and discharging structure caused by the crushing and grinding of materials inside the cylinder 2. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Figure 1 It is a structural schematic diagram of the prior art;
[0030] Figure 2is a schematic structural view of the present utility model;
[0031] Figure 3 is a schematic structural view of a feeding and pushing structure;
[0032] Figure 4 is Figure 3 a sectional view taken along A - A;
[0033] Figure 5 is Figure 3 an enlarged view at B of
[0034] Figure 6 is a schematic structural view of a reverse pushing structure;
[0035] Figure 7 is Figure 6 an enlarged view at C of
[0036] Figure 8 is a schematic structural view of a feeding and pushing structure;
[0037] As shown in the figure: 1 - frame, 2 - cylinder, 3 - impact mechanism, 4 - fixed gear, 5 - planetary gear, 6 - first rotation driving device, 7 - feeding guide cylinder, 8 - discharging guide cylinder, 9 - second rotation driving device, 21 - feeding hollow shaft, 22 - discharging hollow shaft, 23 - feeding transition section, 24 - discharging transition section, 31 - planetary shaft, 33 - impact plate, 71 - feeding central shaft, 72 - feeding spiral belt, 73 - first support, 74 - feeding extension section, 75 - discharging negative pressure sealing channel, 76 - feeding port, 77 - arc plate, 81 - discharging central shaft, 82 - reverse pushing spiral belt, 83 - second support, 84 - discharging extension section, 85 - discharging negative pressure sealing channel, 86 - discharging port, 721 - feeding spiral belt extension section, 821 - reverse pushing spiral belt extension section. Detailed implementation manners
[0038] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.
[0039] As Figure 1 and Figure 2As shown in the figure, the ball mill of the present utility model includes a frame 1 and a cylinder body 2. One end of the cylinder body 2 is provided with a feed hollow shaft 21, and the other end is provided with a discharge hollow shaft 22. The cylinder body 2 is rotatably installed on the frame 1. The ball mill of the present utility model further includes a planetary shaft self-rotation driving mechanism and at least one impact mechanism 3 installed inside the cylinder body 2 and arranged around the axis of the cylinder body 2 so as to be able to revolve around the axis of the cylinder body 2 along with the cylinder body 2. The impact mechanism 3 includes a planetary shaft 31. The planetary shaft 31 is arranged along the axis direction of the cylinder body 2. The planetary shaft 31 is rotatably connected to the cylinder body 2 so that the planetary shaft 31 can rotate around its own axis, that is, rotate self. An impact plate 33 for scraping the wall-attached materials inside the cylinder body 2 is provided on the planetary shaft 31. The planetary shaft self-rotation driving mechanism can be a motor. In the figure, the planetary shaft self-rotation driving mechanism includes a fixed gear 4. The fixed gear 4 is arranged at one end of the cylinder body 2 and is arranged coaxially with the cylinder body 2. The fixed gear 4 is fixedly installed on the frame 1. One end of the planetary shaft 31 close to the fixed gear 4 extends out of the cylinder body 2 and is provided with a planetary gear 5 meshing with the fixed gear 4 to drive the planetary shaft 31 to rotate around its own axis. The fixed gear 4 can be an external gear or an internal gear. In order to solve the problem that when the ball mill breaks through the limit speed, with the increase of the cylinder speed, especially when the cylinder speed exceeds the limit speed of the feed hollow shaft 21 and the discharge hollow shaft 22, the materials will also be affected by the rotation of the cylinder body and generate wall attachment during the process of passing through the feed hollow shaft 21 and the discharge hollow shaft 22, the present utility model is provided with an external drive central continuous feeding structure and a discharge structure on the ball mill. Specifically, as Figure 2As shown, the external drive center continuous feeding structure and discharging structure include a first rotary drive device 6, a second rotary drive device 9, a feed guide cylinder 7 arranged in the feed hollow shaft 21 and rotatably matched with the feed hollow shaft 21, and a discharge guide cylinder 8 arranged in the discharge hollow shaft 22 and rotatably matched with the discharge hollow shaft 22; the outer end of the feed guide cylinder 7 extends out of the feed hollow shaft 21 and is fixedly connected to the frame 1; a feed center shaft 71 coaxial with the feed guide cylinder 7 is provided in the feed guide cylinder 7, and the feed center shaft 71 is rotatably installed in the feed guide cylinder 7, so that the feed center shaft 71 can rotate around its own axis in the feed guide cylinder 7, and a gear is provided on the feed center shaft 71 to cooperate with the inner wall of the feed guide cylinder 7 to rotate. A feed pushing structure for pushing the material in the feed guide tube 7 into the cylinder body 2; the discharge hollow shaft 22 extends from the outer end of the discharge guide tube 8 and is fixedly connected to the frame 1; a discharge center shaft 81 coaxial with the discharge guide tube 8 is provided in the discharge guide tube 8, and the discharge center shaft 81 is rotatably installed in the discharge guide tube 8 so that the discharge center shaft 81 can rotate around its own axis in the discharge guide tube 8; the discharge center shaft 81 is provided with a reverse pushing structure for cooperating with the inner wall of the discharge guide tube 8 to push the sinking material in the discharge guide tube 8 into the cylinder body 2; the first rotary drive device 6 is transmission-connected to the feed center shaft 71, and the second rotary drive device 9 is transmission-connected to the discharge center shaft 81.
[0040] The first rotation drive device 6 and the second rotation drive device 9 can be motors, various electric machines, etc. In the present invention, the first rotation drive device 6 and the second rotation drive device 9 are both motors.
[0041] The fixed connection in the utility model can adopt various conventional fixed connection methods such as bolt connection, welding, etc.
[0042] The feed inlet 76 of the feed guide tube 7 can be arranged on the end face or side face of the feed guide tube 7, and the discharge outlet 86 of the discharge guide tube 8 can also be arranged on the end face or side face of the discharge guide tube 8. In the present invention, the feed inlet 76 of the feed guide tube 7 is arranged on the upper side face of the feed guide tube 7, and the discharge outlet 86 of the discharge guide tube 8 is arranged on the upper side face of the discharge guide tube 8 (see Figure 2 ).
[0043] When the ball mill of the present invention is working, the air inlet end of the pneumatic conveying device is connected to the discharge port of the discharge guide cylinder 8 to evacuate the interior of the cylinder 2 to generate a feeding airflow; the cylinder is driven to rotate around its own axis by the cylinder driving device, and the feed center axis 71 is driven to rotate around its own axis by the first rotation driving device 6 to rotate the feed pushing structure, and the discharge center axis 81 is driven to rotate around itself by the second rotation driving device 9 to rotate the reverse pushing structure.
[0044] In order to better understand the function of the utility model, it is necessary to explain the central feeding and discharging principle of the utility model. Figure 2 , Figure 3 and Figure 6 As shown, during the material processing, the material enters the feed guide tube 7 from the feed port 76 of the feed guide tube 7, and is pushed into the cylinder body by the rotation of the feed push structure. At the same time, the feed guide tube 7 continuously enters the required amount of air for discharge; the material is continuously crushed and ground inside the cylinder 2. During the crushing and grinding process, the fine powder is continuously brought into the discharge guide tube 8 by the air with a certain flow rate inside the cylinder 2 in the state of gas-powder mixture, and discharged through the discharge port 86. In order to reduce the amount of air conveyed by the gas-powder mixture (also to reduce the conveying energy consumption and the amount of dust-containing gas purification and environmental protection treatment), the gas flow rate in the utility model is used as low as possible on the premise of satisfying the conveying of qualified fine powder. During the grinding process inside the cylinder 2, a small part of the material and grinding body close to the feeding direction may also enter the feed guide tube 7 due to collision, and in the same principle, they are pushed back to the cylinder 2 by the central feeding structure. A small part of the coarse material and grinding body close to the discharge direction may also enter the discharge guide tube 8 due to collision, and in the same principle, they are pushed back to the cylinder 2 by the reverse push structure. During the discharging process, a small amount of relatively coarse-grained powder will be separated by gravity and sink to the bottom of the discharging guide tube 8, and this part of the deposited powder will be pushed into the tube by the reverse pushing structure. Therefore, it is obvious that the external drive center continuous feeding structure and discharging structure of the ultra-limit speed ball mill of the utility model are suitable for dry production. Based on the reasons of reducing energy consumption, reducing the circulation rate of powder selection (the powder discharged from the mill generally needs to be separated into qualified powder through powder selection) and reducing the amount of dust-containing air purification and environmental protection treatment, the utility model is particularly suitable for the production of dry ultra-fine powder.
[0045] Specifically, Figure 3 As shown, the feed pushing structure described in the utility model includes at least one feed spiral belt 72 wound around the feed center shaft 71. A spacing is provided between the feed spiral belt 72 and the feed center shaft 71 so that airflow and materials can pass through and enter the cylinder body, thereby reducing airflow resistance. The feed spiral belt 72 is fixed to the feed center shaft 71 through a first support 73. Since the feed spiral belt 72 is driven by the first rotary drive device through the feed center shaft 71 to push the material in the feed guide cylinder 7 into the cylinder body, the specific rotation direction of the feed spiral belt 72 should be set accordingly according to the rotation direction of the first rotary drive device when it is working. Specifically, when the first rotary drive device rotates clockwise, the feed spiral belt is left-handed; when the first rotary drive device rotates counterclockwise, the feed spiral belt is right-handed. Figure 8As shown, in some embodiments, the feeding and pushing structure also adopts a structure in which multiple arc-shaped plates 77 are arranged on the feeding central shaft 71. The arc-shaped plates 77 are inclined with respect to the axis of the feeding central shaft 71. The inclination direction of the arc-shaped plates 77 is also set according to the rotation direction when the first rotation driving device operates. The principle is the same as the above principle and will not be elaborated specifically. The specific number of the feeding spiral belts 72 on the feeding central shaft 71 can be set as required.
[0046] Specifically, as Figure 6 shown, the reverse pushing structure includes at least one reverse pushing spiral belt 82 wound around the discharge central shaft 81. A gap is provided between the reverse pushing spiral belt 82 and the discharge central shaft 81 to facilitate the flow of air and materials out. The reverse pushing spiral belt 82 is fixed to the discharge central shaft 81 through the second support 83. Similarly, since the reverse pushing spiral belt 82 is driven by the second rotation driving device through the discharge central shaft 81 to push the sinking materials in the discharge guide cylinder 8 into the cylinder body 2, the specific helix direction of the reverse pushing spiral belt 82 should be set accordingly according to the rotation direction when the second rotation driving device operates. Specifically, when the second rotation driving device rotates clockwise, the reverse pushing spiral belt is left-handed; when the second rotation driving device rotates counterclockwise, the reverse pushing spiral belt is right-handed. In some embodiments, the reverse pushing structure also adopts a structure in which multiple arc-shaped plates are arranged on the discharge central shaft. The arc-shaped plates are inclined with respect to the axis of the discharge central shaft. The specific number of the reverse pushing spiral belts 82 on the discharge central shaft 81 can be set as required.
[0047] The feeding hollow shaft 21 and the inner wall of the cylinder body can be directly transitioned at 90°. The inner wall of the cylinder body and the discharge hollow shaft 22 can also be directly transitioned at 90°. As Figure 2As shown, in the present utility model, a hollow feed transition section 23 is provided between the inner cavity of the feed hollow shaft 21 and the inner cavity of the cylinder body 2. The inner cavity of the feed transition section 23 is in a frustum-shaped structure, and the small end of the feed transition section 23 is connected to the inner end of the feed hollow shaft 21; a hollow discharge transition section 24 is provided between the inner cavity of the cylinder body 2 and the discharge hollow shaft 22. The inner cavity of the discharge transition section 24 is also in a frustum-shaped structure, and the small end of the discharge transition section 24 is connected to the inner end of the discharge hollow shaft 22. In this way, after the material passes through the feed guide cylinder 7, it will first slide along the inclined surface formed on the inner cavity surface of the feed transition section 23 and then enter the cylinder body, which can make the incoming material fall at the very front end of the cylinder body, facilitating the processing of the material. After the discharge transition section 24 is provided, the material with smaller particles can more easily flow out from the discharge guide cylinder 8 under the action of the air flow, which is beneficial to the discharge of the material. At the same time, it is also convenient for the coarser material pushed back by the reverse pushing structure to slide down again along the inclined surface formed in the inner cavity of the discharge transition section and enter the cylinder body. It can be understood that the inner cavity taper angles of the feed transition section 23 and the discharge transition section 24 should enable the material to slide down along them and enter the cylinder body during the rotation of the cylinder body without adhering to it. Generally speaking, the inner cavity taper angles of the feed transition section 23 and the discharge transition section 24 are greater than 80°. However, due to the too large inner cavity taper angles of the feed transition section 23 and the discharge transition section 24, the feed pushing mechanism and the discharge pushing mechanism will inevitably be lengthened, which will bring negative impacts such as reduced structural strength of the feed pushing structure and the discharge pushing structure, increased manufacturing difficulty, and severe collision and wear with the material grinding body. Therefore, the preferred value of the inner cavity taper angles of the feed transition section 23 and the discharge transition section 24 is 90°.
[0048] The inner end of the feed spiral belt 72 can extend inward beyond the inner end of the feed guide cylinder 7, or of course, it can also not exceed the inner end of the feed guide cylinder 7. As Figure 5 shown, for the convenience of feeding, the inner end of the feed spiral belt 72 is provided with a feed spiral belt extension section 721 that exceeds the inner end of the feed guide cylinder 7. The length of the feed spiral belt extension section 721 can be set as required. However, if the feed spiral belt extension section 721 is too long, it will reduce the structural strength of the feed spiral belt extension section 721 and increase its collision and wear with the material grinding body inside the cylinder body 2. Therefore, in the present utility model, the length of the feed spiral belt extension section 721 is preferably 10 - 20 mm.
[0049] For the convenience of pushing the sinking material into the drum, as Figure 7As shown, in the present utility model, an extended section 821 of the reverse-thrust spiral belt 82 is provided at the inner end of the reverse-thrust spiral belt 82, which extends beyond the inner end of the feed guiding cylinder 7. The length of the extended section 821 of the reverse-thrust spiral belt can be set as required. However, if the extended section 821 of the reverse-thrust spiral belt is too long, it will reduce the structural strength of the extended section 821 of the reverse-thrust spiral belt and increase the grinding collision wear between it and the materials inside the cylinder body 2. Therefore, in the present utility model, the length of the extended section 821 of the reverse-thrust spiral belt is preferably 10 - 20 mm.
[0050] In the present utility model, in order to prevent dust and the like inside the cylinder from entering the gap between the feed guiding cylinder 7 and the feed hollow shaft 21, which may affect the rotation of the cylinder body, a feed negative-pressure sealing channel 85 for introducing external air into the cylinder body 2 is formed between the outer wall of the feed guiding cylinder 7 and the inner wall of the feed hollow shaft 21. That is, one end of the feed negative-pressure sealing channel 85 communicates with the outside, and the other end communicates with the inner cavity of the cylinder body. In this way, the external air can enter the cylinder body through the feed negative-pressure sealing channel 85 under the action of the negative pressure inside the cylinder body, thereby preventing dust and the like inside the cylinder from entering the gap between the feed guiding cylinder 7 and the feed hollow shaft 21. The gap between the outer wall of the feed guiding cylinder 7 and the inner wall of the feed hollow shaft 21 is generally 1 - 5 mm. However, if the value of this gap is too small, it will increase the manufacturing precision and manufacturing cost of the feed hollow shaft 21 and the feed guiding cylinder 7; if the gap value is too large, large particles of materials are likely to enter the gap, affecting the negative-pressure air flow sealing. Therefore, in the present utility model, it is preferably 2 - 3 mm.
[0051] Similarly, in order to prevent dust and the like inside the cylinder from entering the gap between the discharge guiding cylinder 8 and the discharge hollow shaft 22, which may affect the rotation of the cylinder body, a discharge negative-pressure sealing channel 85 for introducing external air into the cylinder body 2 is formed between the outer wall of the discharge guiding cylinder 8 and the inner wall of the discharge hollow shaft 22. That is, one end of the discharge negative-pressure sealing channel 85 communicates with the outside, and the other end communicates with the inner cavity of the cylinder body. In this way, the external air can enter the cylinder body through the discharge negative-pressure sealing channel 85 under the action of the negative pressure inside the cylinder body, thereby preventing dust and the like inside the cylinder from entering the gap between the discharge guiding cylinder 8 and the discharge hollow shaft 22. The gap between the outer wall of the discharge guiding cylinder 8 and the inner wall of the discharge hollow shaft 22 is generally 1 - 5 mm. However, if the value of this gap is too small, it will increase the manufacturing precision and manufacturing cost of the feed hollow shaft 21 and the feed guiding cylinder 7; if the gap value is too large, large particles of materials are likely to enter the gap, affecting the negative-pressure air flow sealing. In the present utility model, it is preferably 2 - 3 mm.
[0052] The inner end of the feed guiding cylinder 7 can extend inwards to exceed the inner end of the feed hollow shaft 21, or it can also not exceed the inner end of the feed hollow shaft 21. For example Figure 5As shown, for the convenience of feeding, the inner end of the feed guide cylinder 7 is provided with a feed extension section 74 that extends beyond the inner end of the feed hollow shaft 21, that is, the inner end of the feed guide cylinder 7 extends beyond the inner end of the feed hollow shaft 21. The length of the feed extension section 74 can be set arbitrarily according to needs. However, practice shows that when the feed extension section 74 is too long, especially after the feed transition section 23 is provided, the material is easily stuck between the stationary feed guide cylinder 7 and the rotating feed transition section 23, causing strong frictional wear and damage to the feed guide cylinder 7 and the feed transition section 23; when the feed extension section 74 is too short, it will damage the negative pressure sealed air intake gap channel between the feed guide cylinder 7 and the feed hollow shaft 21. Therefore, in the present invention, the length of the feed extension section 74 is preferably 5-10 mm.
[0053] The inner end of the discharge guide cylinder 8 can extend inward to exceed the inner end of the discharge hollow shaft 22, and of course it can also not exceed the inner end of the discharge hollow shaft 22. As Figure 7 shown, in the present invention, the inner end of the discharge guide cylinder 8 is provided with a discharge extension section 84 that extends beyond the inner end of the discharge hollow shaft 22, that is, the inner end of the discharge guide cylinder 8 extends beyond the inner end of the discharge hollow shaft 22. The discharge extension section 84 can be set arbitrarily according to needs. However, practice shows that when the discharge extension section 84 is too long, especially after the discharge transition section 24 is provided, the material is easily stuck between the stationary discharge guide cylinder 8 and the rotating discharge transition section 24, causing strong frictional wear and damage to the discharge guide cylinder 8 and the discharge transition section 24, and when the discharge extension section 84 is too short, it will damage the negative pressure sealed air intake gap passage between the discharge guide cylinder 8 and the discharge hollow shaft 22. Therefore, in the present invention, the length of the discharge extension section 84 is preferably 5-10 mm.
Claims
1. Outer drive center continuous feeding structure and discharging structure of an ultra-high speed ball mill. The ball mill includes a frame (1) and a cylinder body (2). One end of the cylinder body (2) is provided with a feeding hollow shaft (21), and the other end is provided with a discharging hollow shaft (22). The cylinder body (2) is rotatably installed on the frame (1), and is characterized in that: The external drive central continuous feeding structure and discharging structure include a first rotary drive device (6), a second rotary drive device (9), a feeding guide cylinder (7) disposed within the feeding hollow shaft (21) and rotatably engaged with the feeding hollow shaft (21), and a discharging guide cylinder (8) disposed within the discharging hollow shaft (22) and rotatably engaged with the discharging hollow shaft (22); The outer end of the feeding guide cylinder (7) extends out of the feeding hollow shaft (21) and is fixedly connected to the frame (1); a feeding central shaft (71) coaxial with the feeding guide cylinder (7) is provided within the feeding guide cylinder (7), the feeding central shaft (71) is rotatably installed within the feeding guide cylinder (7), and a feeding pushing structure for pushing the material within the feeding guide cylinder (7) into the cylinder body (2) is provided on the feeding central shaft (71) and cooperates with the inner wall of the feeding guide cylinder (7); The outer end of the discharging guide cylinder (8) extends out of the discharging hollow shaft (22) and is fixedly connected to the frame (1), a discharging central shaft (81) coaxial with the discharging guide cylinder (8) is provided within the discharging guide cylinder (8), the discharging central shaft (81) is rotatably installed within the discharging guide cylinder (8), and a reverse pushing structure for pushing the sinking material within the discharging guide cylinder (8) into the cylinder body (2) is provided on the discharging central shaft (81) and cooperates with the inner wall of the discharging guide cylinder (8); The first rotary drive device (6) is in transmission connection with the feeding central shaft (71), and the second rotary drive device (9) is in transmission connection with the discharging central shaft (81).
2. The external drive center continuous feeding structure and discharging structure of the ultra-limit speed ball mill according to claim 1, characterized in that: The feeding pushing structure includes at least one feeding spiral belt (72) wound around the feeding central shaft (71), a gap is provided between the feeding spiral belt (72) and the feeding central shaft (71), and the feeding spiral belt (72) is fixed to the feeding central shaft (71) through a first support (73).
3. The external drive center continuous feeding structure and discharging structure of the ultra-limit speed ball mill according to claim 1, characterized in that: The reverse pushing structure includes at least one reverse pushing spiral belt (82) wound around the discharging central shaft (81), a gap is provided between the reverse pushing spiral belt (82) and the discharging central shaft (81), and the reverse pushing spiral belt (82) is fixed to the discharging central shaft (81) through a second support (83).
4. The external drive center continuous feeding structure and discharging structure of the ultra-limit speed ball mill according to claim 1, characterized in that: A hollow first frustum transition section (23) is provided between the feeding hollow shaft (21) and the inner cavity of the cylinder body (2), the inner cavity of the first frustum transition section (23) is of a frustum-shaped structure, and the small end of the first frustum transition section (23) is connected to the inner end of the feeding hollow shaft (21).
5. The external drive center continuous feeding structure and discharging structure of the ultra-limit speed ball mill according to claim 4, characterized in that: The cone angle of the first frustum transition section (23) is greater than 80°, and preferably takes a value of 90°.
6. The external drive center continuous feeding structure and discharging structure of the ultra-limit speed ball mill according to claim 1, characterized in that: A hollow second frustum transition section (24) is provided between the inner cavity of the cylinder body (2) and the discharging hollow shaft (22), the inner cavity of the second frustum transition section (24) is of a frustum-shaped structure, and the small end of the second frustum transition section (24) is connected to the inner end of the discharging hollow shaft (22).
7. The external drive center continuous feeding structure and discharging structure of the ultra-limit speed ball mill according to claim 6, characterized in that: The cone angle of the second frustum transition section (24) is greater than 80°, and preferably takes a value of 90°.
8. The external drive center continuous feeding structure and discharging structure of the ultra-limit speed ball mill according to claim 2, characterized in that: The inner end of the feed spiral belt (72) is provided with a feed spiral belt extension section (721) that extends beyond the inner end of the feed guide cylinder (7). The length of the feed spiral belt extension section (721) is preferably 10 - 20 mm.
9. The external drive center continuous feeding structure and discharging structure of the ultra-limit speed ball mill according to claim 3, characterized in that: The inner end of the reverse push spiral belt (82) is provided with a reverse push spiral belt extension section (821) that extends beyond the inner end of the feed guide cylinder (7). The length of the reverse push spiral belt extension section (821) is preferably 10 - 20 mm.
10. The external drive center continuous feeding structure and discharging structure of the ultra-limit speed ball mill according to claim 1, characterized in that: The gap between the outer wall of the feed guide cylinder (7) and the inner wall of the feed hollow shaft (21) forms a feed negative pressure sealing channel (75) that can introduce external air into the cylinder body (2). The gap between the outer wall of the feed guide cylinder (7) and the inner wall of the feed hollow shaft (21) is preferably 2 - 3 mm; The gap between the outer wall of the discharge guide cylinder (8) and the inner wall of the discharge hollow shaft (22) forms a discharge negative pressure sealing channel (85) that introduces external air into the cylinder body (2). The gap between the outer wall of the discharge guide cylinder (8) and the inner wall of the discharge hollow shaft (22) is preferably 2 - 3 mm.
11. The external drive center continuous feeding structure and discharging structure of the ultra-limit speed ball mill according to any one of claims 1 to 10, characterized in that: The inner end of the feed guide cylinder (7) is provided with a feed extension section (74) that extends beyond the inner end of the feed hollow shaft (21). The length of the feed extension section (74) is preferably 5 - 10 mm.
12. The external drive center continuous feeding structure and discharging structure of the ultra-limit speed ball mill according to any one of claims 1 to 10, characterized in that: The inner end of the discharge guide cylinder (8) is provided with a discharge extension section (84) that extends beyond the inner end of the discharge hollow shaft (22). The length of the discharge extension section (84) is preferably 5 - 10 mm.