Ball feeding device of double-inlet and double-outlet steel ball coal mill
By installing a ball-adding device on the discharge port of the coal feeder, the ball-adding path and the primary air path are isolated, which solves the problem of coal powder spraying during the ball-adding process of the coal mill, simplifies the equipment structure and improves the operating efficiency and security.
Patent Information
- Application Number
- CN202420681491.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-03
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-04-03
AI Technical Summary
The double-in and double-out steel ball mill often has the problem of coal powder spraying during the ball addition process. The existing ball addition structure is complex and the failure rate is high, which affects the safety and economy of the unit.
Design a ball-adding device, installed on the feeding port of the coal feeder, realize the complete isolation of the ball-adding path and the primary air path, simplify the equipment structure, eliminate multiple gate valves, ball storage tanks and positive pressure structures, and shorten the addition Ball path improves the operating efficiency of ball-plugging mechanism.
It effectively prevents airflow in the primary airway from interfering with the balling process, reduces the possibility of coal powder leakage, ensures the stable operation of the coal mill, reduces the failure rate, and improves operating efficiency.
Smart Images
Figure CN222469245U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of coal mill ball adding, and in particular to a ball adding device for a double-inlet and double-outlet steel ball coal mill. Background Art
[0002] In the double-inlet and double-outlet steel ball coal mill, the raw coal enters the mixing box from the raw coal hopper through the coal feeder, and after being pre-dried by the bypass air, it falls to the upper entrance of the screw conveyor through the coal drop pipe, and the raw coal is sent into the rotating cylinder by the rotation of the screw conveyor. A certain amount of grinding media - steel balls are installed in the cylinder. The double-inlet and double-outlet steel ball coal mill uses the low-speed rotating cylinder to drive the steel balls in the cylinder to move, and the raw coal is crushed and ground into powder by the impact, extrusion and grinding of the steel balls on the raw coal. In this process, the quality and quantity of steel balls, as the main grinding media, have a direct impact on the operating efficiency of the coal mill and the fineness of the coal powder. However, in the actual operation process, the steel balls, as loss parts, will continue to wear and consume. In order to ensure the continuous and stable operation of the coal mill, new steel balls must be added to the cylinder regularly.
[0003] In the double-inlet and double-outlet steel ball coal mill, the existing ball adding mechanism is usually connected to the hot air box of the coal mill and communicated with the primary air path of the coal mill, so the problem of coal powder spraying often occurs during the ball adding process. In order to solve the problem of coal powder spraying, the existing ball adding structure vertically arranges the ball adding box, the upper gate valve, the ball storage tank, the lower gate valve and the pipeline in sequence, and the upper gate valve and the lower gate valve are coordinated and controlled to solve the coal powder leakage. In this structural design, the upper gate valve and the lower gate valve are stuck, which will still cause coal powder spraying and even pipeline blockage. The failure rate is high and cannot be handled during the operation of the coal mill, which seriously affects the safety and economy of the unit. Utility Model Content
[0004] The embodiment of the present application provides a ball adding device for a double-inlet and double-outlet steel ball mill, which can solve the technical problem of coal powder spraying out when the ball adding mechanism of the double-inlet and double-outlet steel ball mill adds balls in the related art.
[0005] In the first aspect, an embodiment of the present application provides a ball adding device for a double-inlet and double-outlet ball mill, wherein the double-inlet and double-outlet ball mill comprises a coal feeder, a mixing box, a coal dropping pipe, a screw conveyor, a cylinder and a primary air path, wherein the coal feeder has a discharge port, and the discharge port is downwardly connected to the mixing box, the coal dropping pipe and the screw conveyor in sequence, the screw conveyor is connected to the cylinder, and the primary air path comprises a bypass primary air path connected to the mixing box, and a hot air box connected to the screw conveyor; the ball adding device comprises a ball adding box, in which a ball storage space is formed; a ball adding pipe, which is arranged below the ball adding box, one end of the ball adding pipe is connected to the ball adding box, and the other end is connected to the discharge port; and a ball adding valve, which is arranged between the ball adding box and the ball adding pipe.
[0006] In some embodiments, the ball adding box includes: a ball adding box body, the bottom of which is downwardly connected to the ball adding pipe, the upper end of the ball adding box body is a rectangular cavity structure, and the lower end is a bucket-shaped structure; and a ball adding cover body, which can be relatively rotatably installed on the top of the ball adding box body.
[0007] In some embodiments, the ball adding cover body includes a flap and a counterweight plate connected to the flap, and an axial hole is provided at the connection between the two; a ball adding opening is provided on the top of the ball adding box body, and rotating shafts are provided on both sides of the ball adding opening relative to the axial hole, and a limiting edge is provided on the side close to the flap; wherein the axial hole is installed in cooperation with the rotating shaft, and the limiting edge is used to stop the flap and limit the flap from flipping up.
[0008] In some of the embodiments, a counterweight block is installed at the bottom of the counterweight plate.
[0009] In some embodiments, a rubber buffer is provided below the limiting edge; wherein, after the limiting edge abuts against the flap, the rubber buffer is in close contact with the flap.
[0010] In some of the embodiments, the primary air path further includes a capacity air path, and the capacity air path is connected to the hot air box and to the bypass air path.
[0011] In some embodiments, the ball adding pipeline includes: a first pipeline, which is vertically arranged and connected to the bottom of the ball adding box and connected to the ball storage space; and a second pipeline, one end of which is connected to the first pipeline at an angle and the other end is inclined downward and connected to the discharge port.
[0012] In some embodiments, the second pipeline is fixedly connected to the outer shell of the coal feeder near the discharge port by welding.
[0013] In some embodiments, a buffer portion is disposed on the inner wall of the first pipe, and the buffer portion has a downwardly inclined plane.
[0014] In some embodiments, the ball adding valve includes: a valve body, which is arranged between the ball adding box and the ball adding pipeline; and a manual mechanism, which is connected to the valve body and is used to manually control the opening and closing of the valve body.
[0015] In general, in the embodiment of the present application, the installation position of a ball adding device of a double-inlet and double-outlet steel ball coal mill is set on the discharge port of the coal feeder, so as to realize the complete isolation of the ball adding device and the primary air path. The isolation design effectively prevents the airflow in the primary air path from interfering with the ball adding process, reduces the possibility of coal powder leakage, and ensures the stable operation of the coal mill. The present application simplifies the equipment structure, eliminates multiple gate valves, ball storage tanks, and possible positive pressure structures (for example, sealed fans, compressed air systems, etc.), shortens the ball adding path, and improves the operating efficiency of the ball adding mechanism. Based on the ball adding device of the present application, the steel ball starts from the ball adding device, passes through the mixing box, the coal drop pipe, and the screw conveyor from the discharge port in sequence, and finally enters the cylinder. In this process, the flow of the steel ball in the coal drop pipe plays a role in lubricating and pushing the coal powder. The addition of the steel ball can effectively reduce the friction between the raw coal, so that the raw coal can flow more smoothly. At the same time, the gravity and inertia of the steel ball will also push the raw coal to move downward to prevent the raw coal from being retained and blocked in the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.
[0017] Figure 1 A schematic diagram of a ball adding device of a double-inlet and double-outlet steel ball coal mill according to an embodiment of the present application;
[0018] Figure 2 This is a cross-sectional schematic diagram of a ball box in an embodiment of the present application;
[0019] Figure 3 It is a partially enlarged cross-sectional schematic diagram of the limiting edge in the embodiment of the present application;
[0020] Figure 4 It is a cross-sectional schematic diagram of a ball adding pipeline and a ball adding valve in an embodiment of the present application;
[0021] Reference numerals:
[0022] 10. Ball adding box; 20. Ball adding pipeline; 30. Ball adding valve; 60. Coal mill;
[0023] 11. Add ball box; 12. Add ball cover; 21. First pipeline; 22. Second pipeline;
[0024] 31. Valve body; 32. Manual mechanism; 61. Coal feeder; 62. Mixing box; 63. Coal drop pipe; 64. Screw conveyor; 65. Cylinder; 66. Primary air duct;
[0025] 110, ball adding opening; 111, rotating shaft; 112, limiting edge; 113, rubber buffer; 121, flap; 122, counterweight plate; 123, shaft hole; 211, buffer part; 611, raw coal bin; 612, discharge port; 661, bypass air duct; 662, capacity air duct; 663, hot air box;
[0026] 1121. guide surface; 1122. limit surface; 1220. counterweight. DETAILED DESCRIPTION
[0027] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0028] Since the ball adding mechanism of the double-inlet and double-outlet steel ball mill in the related art often has technical problems such as upper and lower gate valves being stuck, pipelines being blocked, and coal powder being sprayed out, the present application proposes a ball adding device for the double-inlet and double-outlet steel ball mill.
[0029] See also Figure 1 , Figure 1 The schematic diagram of the ball adding device of the double-inlet and double-outlet steel ball mill in the embodiment of the present application, the double-inlet and double-outlet steel ball mill 60 in the embodiment of the present application includes a coal feeder 61, a mixing box 62, a coal drop pipe 63, a screw conveyor 64, a cylinder 65 and a primary air path 66. The coal feeder 61 has a raw coal bin 611 and a discharge port 612, the discharge port 612 is connected to the mixing box 62 downward, the mixing box 62 is connected to the coal drop pipe 63 downward, the coal drop pipe 63 is connected to the screw conveyor 64 downward, and the screw conveyor 64 is connected to the cylinder 65. In this embodiment, the primary air path 66 includes a bypass air path 661, a capacity air path 662 and a hot air box 663, wherein the bypass air path 661 is connected to the mixing box 62, the hot air box 663 is connected to the screw conveyor 64, and the capacity air path 662 is connected to the screw conveyor 64 through the hot air box 663.
[0030] It can be understood that in the above-mentioned double-inlet and double-outlet ball mill 60, the raw coal enters the coal feeder 61 through the raw coal bin 611, and enters the mixing box 62 through the discharge port 612, and after being pre-dried by the bypass air in the bypass air path 661, it falls to the upper entrance of the screw conveyor 64 through the coal drop pipe 63, and the raw coal is sent into the rotating cylinder 65 by the rotation movement of the screw conveyor 64.
[0031] It should be noted that the ball adding mechanism in the related art is often connected to the hot air box 663, and the steel ball enters the cylinder 65 through the hot air box 663 and the screw conveyor 64. This design can easily cause the coal powder in the raw coal to spray from the hot air box 663 to the ball adding mechanism during the ball adding. Therefore, the ball adding mechanism in the related art is usually provided with two gate valves, an upper gate valve and a lower gate valve, which cooperate to ensure that the internal pressure of the coal mill is not lost and the coal powder is prevented from spraying out; even a positive pressure device, such as a compressed air system or a sealing fan, is added to prevent the coal powder from spraying out. However, the ball adding mechanism in the related art has a complex mechanical structure, low ball adding efficiency, and there are problems such as frequent jamming of the upper and lower gate valves and a high failure rate, which cannot effectively solve the problem of coal powder spraying out.
[0032] In view of the above problems existing in the related art, the present application installs the ball adding device on the coal feeder 61, isolates the ball adding path from the primary air path 66, and can significantly reduce the possibility of coal powder spraying. It should be noted that since the ball adding device in the present application is isolated from the primary air path 66, there is no need to consider sealing and pressure maintenance. Based on this, the overall structure is simplified to form the ball adding device in the present application. For details, see Figure 1 The ball adding device in the embodiment of the present application includes a ball adding box 10 , a ball adding pipeline 20 and a ball adding valve 30 , wherein one end of the ball adding pipeline 20 is connected to the discharge port 612 of the coal feeder 61 .
[0033] On the one hand, the installation position of the ball adding device in the embodiment of the present application is set on the discharge port 612 of the coal feeder 61, so as to realize the complete isolation of the ball adding device and the primary air path 66. The isolation design effectively prevents the airflow in the primary air path 66 from interfering with the ball adding process, reduces the possibility of coal powder leakage, and ensures the stable operation of the coal mill 60. On the other hand, the present application simplifies the equipment structure, omits multiple gate valves, ball storage tanks, and possible positive pressure structures (for example, sealing fans, compressed air systems, etc.), shortens the ball adding path, and improves the operation efficiency of the ball adding mechanism.
[0034] In addition, the steel balls pass through the ball adding device of the present application, and the process of passing through the mixing box 62, the coal drop pipe 63, the screw conveyor 64, and finally entering the cylinder 65 from the discharge port 612 in sequence has a significant effect on ensuring the smoothness of the coal drop pipe 63. First, the flow of the steel balls in the coal drop pipe 63 plays a role in lubrication and pushing the coal powder. In the process of raw coal transportation, due to the coal powder particles entrained in the raw coal, the friction and adhesion between the coal powder particles are prone to blockage or poor flow. The addition of steel balls can effectively reduce the friction between the coal powder particles and make the raw coal flow more smoothly. At the same time, the gravity and inertia of the steel balls will also push the raw coal forward to prevent the raw coal from being retained or blocked in the coal drop pipe 63. Therefore, the ball adding device of the present application effectively ensures the smoothness of the coal drop pipe 63, and also reduces the failure rate caused by blockage, providing a reliable guarantee for the transportation of raw coal.
[0035] See also Figure 2 , Figure 2 The cross-sectional schematic diagram of the ball adding box 10 in the embodiment of the present application, the ball adding box 10 includes a ball adding box body 11 and a ball adding cover body 12, wherein the ball adding cover body 12 is relatively rotatably mounted on the top of the ball adding box body 11. Specifically, the ball adding cover body 12 includes a flap 121 and a counterweight plate 122, the flap 121 and the counterweight plate 122 are connected, and an axial hole 123 is provided at the connection between the two, and a counterweight block 1220 is installed at the bottom of the counterweight plate 122. The upper end of the ball adding box body 11 is a rectangular cavity structure, and the lower end is a bucket-shaped structure, and the rectangular cavity structure and the bucket-shaped structure together form a ball storage space. Among them, a ball adding opening 110 is provided on the top of the rectangular cavity structure, and the bottom of the bucket-shaped structure is downwardly connected to the ball adding pipeline 20. Rotating shafts 111 are provided on both sides of the ball-adding opening 110 opposite to the shaft hole 123 , and a limiting edge 112 is provided on one side of the ball-adding opening 110 close to the flap 121 , and a rubber buffer 113 is provided below the limiting edge 112 .
[0036] Further, in the embodiment of the present application, after the shaft hole 123 is installed in cooperation with the rotating shaft 111, under the action of the counterweight plate 122 and the counterweight block 1220, the end of the flap 121 away from the counterweight plate 122 is in close contact with the rubber buffer 113 and abuts against the limiting edge 112, wherein the limiting edge 112 is used to limit the flap 121 from flipping up. It can be understood that the operator can overcome the counterweight and rotate the ball adding cover 12 to open the box cover by applying external force to the flap 121, for example, the operator manually overcomes the counterweight, or operates the ball adding bucket to keep the end of the flap 121 away from the counterweight plate 122 inserted into the ball adding opening 110. After the operator removes the external force applied to the flap 121, the ball adding cover body 12 rotates and closes under the deadweight of the counterweight plate 122, wherein the provision of the rubber buffer 113 can reduce the impact between the ball adding cover body 12 and the ball adding box body 11 when the ball adding cover body 12 rotates and closes, thereby reducing the risk of damage to the ball adding box 10. In addition, based on different production requirements, the operator can change the speed and strength of the opening and closing of the ball adding cover body 12 by adjusting the weight of the counterweight block 1220. Similarly, when the flap 121 is not subjected to external force, under the deadweight of the counterweight plate 122 and the counterweight block 1220, the ball adding cover body 12 remains closed on the top of the ball adding box body 11, which helps prevent dust, debris or other objects from entering the ball storage space, and ensures the cleanliness of the ball adding process. In general, the ball adding cover body 12 provided with a counterweight in the present application can be opened and closed automatically under force, and the ball adding process is simple and convenient, with low maintenance costs and failure rates.
[0037] See also Figure 3 , Figure 3It is a partial enlarged cross-sectional schematic diagram of the limiting edge 112 in the embodiment of the present application. As a preferred embodiment, in the present application, the limiting edge 112 is wedge-shaped, including a downwardly inclined guide surface 1121 and a limiting surface 1122 connected to the guide surface 1121, and the rubber buffer 113 is arranged on the limiting surface 1122. When the operator operates the ball adding bucket or the steel ball conveying device to approach the ball adding opening 110, the guide surface 1121 can guide the ball adding bucket or the steel ball conveying device into the ball adding opening 110.
[0038] See also Figure 4 , Figure 4 This is a cross-sectional schematic diagram of the ball adding pipeline 20 and the ball adding valve 30 in the embodiment of the present application. It can be seen that in the embodiment of the present application, the ball adding pipeline 20 includes a first pipeline 21 and a second pipeline 22, and the first pipeline 21 is connected to the second pipeline 22. Among them, the first pipeline 21 is arranged vertically and connected to the bottom of the ball adding box 10, and the first pipeline 21 is connected to the ball storage space. In the present application, the inner wall of the first pipeline 21 is provided with a buffer portion 211, and the buffer portion 211 has a downward inclined plane, and the buffer portion 211 is used to slow down the falling speed of the steel ball. It should be noted that the vertical path in the ball adding path in the related art is often very long. Therefore, the buffer device is usually used to slow down the falling speed of the steel ball and prevent the steel ball from being damaged or even piercing the pipeline in the ball adding mechanism. In the present application, the vertical path in the ball adding path (corresponding to the first pipe 21) is shorter, but the steel balls need to pass through a longer vertical conveying path after entering the coal mill from the ball adding device. If the steel balls fall too concentratedly, it may cause damage to the coal mill. Therefore, a buffer part 211 is provided in the present application to slow down the speed of the steel balls and disperse the flow of the steel balls to avoid the steel balls from entering the coal mill in a concentrated manner.
[0039] Preferably, in the present application, at least one buffer portion 211 is provided in the first pipe 21: when a buffer portion 211 is provided on the inner wall of the first pipe 21, one buffer portion 211 is provided in the middle section of the first pipe 21; when a plurality of buffer portions 211 are provided on the first pipe 21, the plurality of buffer portions 211 are arranged in two rows, each row is arranged at intervals along the axial direction of the first pipe 21, and the two rows of buffer portions 211 are arranged opposite to each other.
[0040] Further, the second pipe 22 is connected to the first pipe 21 at an angle, wherein one end of the second pipe 22 is connected to the first pipe 21, and the other end is tilted downward and connected to the discharge port 612. In the present application, the second pipe is fixedly connected to the outer shell of the coal feeder 61 near the discharge port 612 by welding, and is connected to the discharge port 612. It is understandable that in order to avoid the steel ball staying in the second pipe 22 and causing blockage, the second pipe 22 is tilted downward in the embodiment of the present application. At the same time, in order to avoid the steel ball entering the coal mill too fast, the inclination angle of the second pipe 22 is not easy to be too large. Preferably, the angle range between the axis of the second pipe 22 and the horizontal direction is 5°~15°.
[0041] Continue to see Figure 4 In the embodiment of the present application, the ball adding valve 30 includes a valve body 31 and a manual mechanism 32. The valve body 31 is arranged between the ball adding box 10 and the ball adding pipeline 20. The manual mechanism 32 is connected to the valve body 31. The manual mechanism 32 is used to control the opening and closing of the valve body 31. In the present application, the manual mechanism 32 includes a handle, a worm gear and a worm, and the worm gear can be driven by a hand wheel to open or close the valve body 31. In the present embodiment, the ball adding valve 30 can be a butterfly valve.
[0042] As another feasible implementation, the ball-adding valve 30 also includes a pneumatic mechanism, for example, a pneumatic manual butterfly valve is used, wherein the pneumatic mechanism is connected to the valve body 31 and the valve body 31 is driven to open or close by compressed air: the pneumatic mechanism includes a cylinder, a piston, and a transmission mechanism. When the compressed air enters the cylinder, the piston pushes the transmission mechanism, thereby driving the valve body 31 to open or close. It can be understood that the butterfly valve has the characteristics of simple structure, small size, light weight, and rapid opening and closing. Compared with the hydraulically driven gate valve, the pneumatic mechanism can achieve rapid response. At this time, the manual mechanism 32 can be used as a safety redundant alternative to ensure the reliability of the ball-adding valve 30.
[0043] The ball adding device in the present application can ensure that steel balls are added during the operation of the coal mill. The operating personnel start the ball adding device according to actual needs, which can ensure that the number of steel balls in the coal mill is always at a basically constant value, so that the coal mill can exert the best pulverizing output. The ball adding device in the present application is simple and easy to implement, has a low failure rate, and is convenient for adding balls.
[0044] In general, the embodiment of the present application provides a ball adding device for a double-inlet and double-outlet ball mill, which can be installed on the discharge port 612 of the coal feeder 61, isolates the ball adding path from the primary air path 66, and can effectively avoid coal powder spraying; without sacrificing performance, the equipment structure is simplified, the failure rate is reduced, and the operating efficiency is improved; in the present application, the ball adding box 10 is equipped with a ball adding cover body 12 provided with a counterweight plate 122, wherein the ball adding cover body 12 can overcome the counterweight to open after applying a certain external force, and will automatically close in the absence of external force, and the ball adding process is simple and convenient; in the present application, the valve body 31 is equipped with two driving modes: manual drive and pneumatic manual drive. Among them, in the pneumatic manual drive, the pneumatic drive has a fast response speed, which can effectively avoid the valve body 31 from getting stuck due to too slow closing speed, and the manual drive can be manually operated in the absence of air source or pneumatic mechanism failure, thereby ensuring the reliability and flexibility of the ball adding valve 30.
[0045] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.
[0046] In addition, the descriptions of "first", "second", etc. in this application are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.
[0047] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims
1. A ball adding device for a double-inlet and double-outlet steel ball coal mill, characterized in that: The double-inlet and double-outlet steel ball coal mill comprises a coal feeder, a mixing box, a coal drop pipe, a screw conveyor, a cylinder and a primary air path, wherein the coal feeder has a discharge port, the discharge port is downwardly connected to the mixing box, the coal drop pipe and the screw conveyor in sequence, the screw conveyor is connected to the cylinder, the primary air path comprises a bypass air path connected to the mixing box, and a hot air box connected to the screw conveyor; the ball adding device comprises: A ball box is added, and a ball storage space is formed inside the ball box; A ball adding pipeline is arranged below the ball adding box, one end of the ball adding pipeline is connected to the ball adding box, and the other end is connected to the discharge port; And a ball adding valve is arranged between the ball adding box and the ball adding pipeline.
2. The ball adding device of the double-inlet and double-outlet steel ball coal mill according to claim 1 is characterized in that: The ball adding box comprises: A ball adding box, the bottom of which is downwardly connected to the ball adding pipe, the upper end of the ball adding box is a rectangular cavity structure, and the lower end is a bucket-shaped structure; and The ball adding cover body is relatively rotatably mounted on the top of the ball adding box body.
3. The ball adding device of the double-inlet and double-outlet steel ball coal mill according to claim 2 is characterized in that: The ball-adding cover body includes a flap and a counterweight plate connected to the flap, and an axis hole is provided at the connection between the two; A ball adding opening is provided on the top of the ball adding box body, rotating shafts are provided on both sides of the ball adding opening relative to the shaft hole, and a limiting edge is provided on the side close to the flap; The shaft hole is installed in cooperation with the rotating shaft, and the limiting edge is used to abut against the flap and limit the flap from turning up.
4. The ball adding device of the double-inlet and double-outlet steel ball coal mill according to claim 3 is characterized in that: A counterweight block is installed at the bottom of the counterweight plate.
5. The ball adding device of the double-inlet and double-outlet steel ball coal mill according to claim 3 is characterized in that: A rubber buffer is provided below the limit edge; Wherein, after the limiting edge abuts against the flap, the rubber buffer is in close contact with the flap.
6. The ball adding device of the double-inlet and double-outlet steel ball coal mill according to claim 1 is characterized in that: The primary air passage also includes a capacity air passage, and the capacity air passage is communicated with the hot air box and the bypass air passage.
7. The ball adding device of the double-inlet and double-outlet steel ball coal mill according to claim 1 is characterized in that: The ball adding pipeline comprises: a first pipeline, arranged vertically and connected to the bottom of the ball adding box, and communicated with the ball storage space; and The second pipeline has one end connected to the first pipeline at an angle, and the other end inclined downward to be connected to the discharge port.
8. The ball adding device of the double-inlet and double-outlet steel ball coal mill according to claim 7, characterized in that: The second pipeline is welded and fixedly connected to the outer shell of the coal feeder near the discharge port.
9. The ball adding device of the double-inlet and double-outlet steel ball coal mill according to claim 7, characterized in that: A buffer portion is arranged on the inner wall of the first pipe, and the buffer portion has a downwardly inclined plane.
10. The ball adding device of the double-inlet and double-outlet steel ball coal mill according to claim 1, characterized in that: The ball adding valve comprises: a valve body, arranged between the ball adding box and the ball adding pipeline; and The manual mechanism is connected to the valve body and is used for manually controlling the opening and closing of the valve body.