Barrel structure for steel ball coal mill

Abstract

The utility model discloses a barrel structure for a steel ball coal mill, which comprises a barrel with two closed ends, a transmission shaft and an annular bin, and the transmission shaft is coaxially positioned in an inner cavity of the barrel, penetrates through the two ends and is fixedly connected with the inner cavity of the barrel; the annular outer wall of the annular bin is connected to the inner wall of the middle of the barrel in a bolted mode so that an inner cavity of the barrel can be divided into a first bin chamber and a second bin chamber which are equal in volume. The annular inner wall of the annular bin is fixedly arranged on the transmission shaft in a sleeving mode, and a notch is formed in the annular inner wall, opposite to the transmission shaft, of the annular bin so as to communicate the first bin with the second bin to balance the material level. The annular bin is installed in the middle of the barrel, on one hand, the annular bin can occupy the space of the barrel, then the effective volume in the barrel is reduced, and the steel ball loading coefficient is increased by reducing the effective volume of the barrel; on the other hand, the inner cavity of the barrel can be divided into two chambers with the same volume through the annular bin, the balance of the raw coal amount and the steel ball amount in the two chambers is kept through the notch, and it is guaranteed that the steel balls are separated in the two chambers.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of steel ball grinding, more particularly to a cylinder structure for a steel ball coal mill. BACKGROUND

[0002] The double-in double-out steel ball coal mill is widely used in coal-fired power generating units, and the ratio of the volume of the steel balls in the cylinder to the volume of the cylinder is called the steel ball loading coefficient. Each type of steel ball coal mill has an optimal steel ball loading coefficient, at which the unit power consumption for grinding is the smallest. In order to reduce the power consumption for grinding, power plants will reduce the amount of steel balls loaded to reduce the current of the main motor under the premise of ensuring the grinding output, which results in that the steel ball loading coefficient of many steel ball coal mills in actual operation is lower than the optimal steel ball loading coefficient. In recent years, the less ball technology has been developed, which can reduce the amount of steel balls loaded by more than 15% under the premise of ensuring the output of the coal mill by optimizing the gradation of the steel balls, thereby further reducing the steel ball loading coefficient.

[0003] The double-in double-out steel ball coal mill uses a differential pressure material level control system for automatic coal feeding control, and the normal operating condition is that the lower differential pressure pipeline is inserted into the fine coal powder layer. With the decrease of the amount of steel balls in the cylinder, the total amount of the mixture of the steel balls, raw coal particles and fine coal powder also decreases. When the total amount is too low for the lower differential pressure pipeline to be inserted into the fine coal powder layer, the differential pressure material level control system fails.

[0004] With the application of the less ball technology, the failure of the differential pressure material level control system is more and more common, which poses a great threat to the normal production of power plants.

[0005] Therefore, how to ensure that the steel ball loading coefficient is improved to the optimal steel ball loading coefficient by reducing the volume of the cylinder without changing the size of the cylinder of the coal mill, and without reducing the amount of steel balls in the cylinder, is a problem that needs to be solved by those skilled in the art. UTILITY MODEL CONTENTS

[0006] Therefore, the utility model provides a cylinder structure for a steel ball coal mill, which occupies the inner cavity of the cylinder by using the annular bin, reduces the effective volume of the cylinder without changing the size of the cylinder structure, and does not reduce the amount of steel balls, so that the excessively low steel ball loading coefficient is improved to the optimal steel ball loading coefficient.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0008] A cylinder structure for a steel ball coal mill, comprising a cylinder closed at both ends, a transmission shaft and an annular bin,

[0009] One end of the barrel is provided with a ball adding opening, and both ends are provided with a coal adding opening; the transmission shaft is coaxially located in the inner cavity of the barrel and penetrates both ends and is fixedly connected therewith, the annular outer wall of the annular bin is bolted to the middle inner wall of the barrel to divide the inner cavity of the barrel into two first and second chambers with equal volume; the annular inner wall of the annular bin is fixedly sleeved on the transmission shaft, and the annular bin is provided with a notch in the annular inner wall relative to the transmission shaft to communicate the first and second chambers to balance the material level.

[0010] The beneficial effects of the technical scheme of the utility model are that the annular bin is installed in the middle part of the barrel, which can occupy the space of the barrel, thereby reducing the effective volume in the barrel, and the steel ball loading coefficient is improved by reducing the effective volume of the barrel; on the other hand, the annular bin can divide the inner cavity of the barrel into two chambers with equal volume, the amount of raw coal and the amount of steel balls in the two chambers are balanced through the notch, and it is ensured that the steel balls are separated in the two chambers.

[0011] Preferably, the annular bin comprises a first annular bin body and a second annular bin body.

[0012] The first annular bin body has an outer ring surface one and two side ring surfaces one, one end of the two side ring surfaces one is connected to both ends of the outer ring surface one along the axial direction, and the other end is inclined to the center axis of the first annular bin body and the direction of approaching each other to form a first inclined surface, and the side of the two first inclined surfaces corresponding to the center axis of the first annular bin body is the inner ring side of the first annular bin body.

[0013] The second annular bin body has an outer ring surface two, two side ring surfaces two and an inner ring surface, the outer ring surface two is coaxially and fixedly connected to the inner ring side of the first annular bin body; one end of the two side ring surfaces two is connected to both ends of the outer ring surface two along the axial direction, and the other end is connected to both ends of the inner ring surface along the axial direction, and the other end of the two side ring surfaces two is inclined to the center axis of the second annular bin body and the direction of approaching each other to form a second inclined surface.

[0014] The beneficial effects of the above technical scheme are that the inclined surface can lift the filling degree of the mixture of steel balls, raw coal particles and fine coal powder in the barrel, and facilitate the flow of steel balls and raw coal in the two chambers through the notch.

[0015] Preferably, the inclination angle of the second inclined surface is greater than that of the first inclined surface. The inclined surfaces with different inclination angles are used to lift the filling degree of the mixture of steel balls, raw coal particles and fine coal powder in the barrel, so as to ensure the flow of steel balls and raw coal between the two chambers.

[0016] Preferably, the wedge-shaped block is further included, a plurality of grooves are arranged on the inner ring surface of the second ring chamber body, and the plurality of wedge-shaped blocks are fixed on the groove sidewalls of the plurality of grooves corresponding to the rotation direction of the cylinder body. The grooves can make the high side of the ball level and the coal level in the first chamber and the second chamber flow to the low side, facilitate the flow of the steel ball and the raw coal in the two chambers, and ensure the balance of the material level in the two chambers. The wedge-shaped block can prevent the steel ball from rotating in the groove with the rotation of the cylinder body, thereby affecting the balance of the steel ball in the two chambers.

[0017] Preferably, the first inclined surface and the second inclined surface are both fixed with a wear-resistant layer formed by a plurality of first lining plates spliced or by double metal surfacing. The service life of the ring chamber is improved.

[0018] Preferably, a plurality of bolt holes are arranged on the first inclined surface and the second inclined surface, the first lining plate is in a fan-shaped structure, a convex rib is fixed on the side panel of the first lining plate away from the first inclined surface or the second inclined surface, a counterbore corresponding to the bolt hole is arranged on the convex rib, and the threaded end of a fastening bolt penetrates the counterbores and the bolt holes in sequence to fasten the first lining plate with the first inclined surface or the second inclined surface. The first lining plate is detachably connected with the first ring chamber body and the second ring chamber body, facilitating maintenance and replacement in the later period.

[0019] Preferably, the included angle α between the first inclined surface and the annular outer wall of the first ring chamber body is 70°-90°, and the included angle β between the second inclined surfaces on both sides of the second ring chamber body is 40°-60°. The inclined surfaces with different inclination angles are used to lift the filling degree of the mixture of the steel ball, the raw coal particles and the fine coal powder in the cylinder, so that the steel ball and the raw coal can flow between the two chambers.

[0020] Preferably, the wedge-shaped block is in a hollow structure, and the included angle between the two wedge-shaped surfaces of the wedge-shaped block is 40°-60°. The two wedge-shaped surfaces of the wedge-shaped block form a ball-facing surface, which can prevent the steel ball in the groove from rotating with the rotating cylinder, and ensure the flow of the steel ball between the two chambers.

[0021] Preferably, the groove depth is 150-300 mm and greater than the outer diameter of the steel ball. The steel ball can flow between the two chambers through the groove.

[0022] Preferably, the outer ring surface of the first ring bin body is bolted to the middle inner wall of the barrel body; and the inner ring surface of the second ring bin body is tightly matched with the outer wall of the transmission shaft. The ring bin separates the inner cavity of the barrel body into two bin chambers with equal volume, and occupies the space in the barrel body, thereby effectively reducing the volume of the barrel body without changing the structure of the barrel body. The inclined surface is arranged to raise the filling degree of the mixture of steel balls, raw coal particles and fine coal powder, and the groove and the wedge block are matched to ensure the circulation of raw coal and steel balls between the two bin chambers, thereby ensuring the balance of the amount of raw coal and the amount of steel balls in the first bin chamber and the second bin chamber.

[0023] Preferably, the inner wall of the barrel body is bolted with a second lining plate. The second lining plate is used to improve the wear resistance of the barrel body.

[0024] Compared with the prior art, the barrel body structure for the steel ball coal mill provided by the utility model can occupy the space of the barrel body by the ring bin, thereby reducing the effective volume in the barrel body, improving the steel ball loading coefficient of the steel ball coal mill by reducing the effective volume of the barrel body, and increasing the originally too low steel ball loading coefficient to the optimal steel ball loading coefficient.

[0025] The design of the inclined surface of the ring bin can raise the filling degree of the mixture of steel balls, raw coal particles and fine coal powder in the barrel body; and the design of the groove and the wedge block can ensure that the material levels of the raw coal and the steel balls relative to the two sides of the ring bin are in a balanced state.

[0026] The utility model has obvious effects of improving the pulverizing capacity of the steel ball coal mill, reducing the power consumption and steel consumption for pulverizing, and restoring the differential pressure material level control system which is disabled due to the too low loading coefficient, and has important significance for ensuring the economic and stable operation of the generator set. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only the embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creating labor.

[0028] Figure 1 It is the ring bin structure schematic view in the barrel body structure for the steel ball coal mill of the utility model;

[0029] Figure 2 It is the structure schematic view after the ring bin is installed with the wear-resistant layer in the barrel body structure for the steel ball coal mill of the utility model;

[0030] Figure 3 It is Figure 2 It is the ring bin half-section schematic view;

[0031] Figure 4 The drawing is used for arranging the groove in the cylinder structure of the steel ball coal mill of the utility model;

[0032] Figure 5 The wedge-shaped block section view is used for arranging the groove in the cylinder structure of the steel ball coal mill of the utility model;

[0033] Figure 6 The first lining plate structure schematic diagram is used for arranging the groove in the cylinder structure of the steel ball coal mill of the utility model;

[0034] Figure 7 The cylinder section view is used for arranging the groove in the cylinder structure of the steel ball coal mill of the utility model;

[0035] Figure 8 The second lining plate structure schematic diagram is used for arranging the groove in the cylinder structure of the steel ball coal mill of the utility model;

[0036] Figure 9 The measurement principle diagram of the pressure difference material position control system in the embodiment 2 of the utility model;

[0037] Figure 10 The schematic diagram of the pressure difference material position control system in the embodiment 2 of the utility model.

[0038] Wherein,

[0039] 1-the first annular bin; 11-the first inclined surface; 12-the first cavity;

[0040] 2-the second annular bin; 21-the second inclined surface; 22-groove; 23-the second cavity;

[0041] 3-wedge-shaped block; 31-wedge-shaped inclined surface; 32-straight plane;

[0042] 4-the first lining plate; 41-ridge; 42-counterbore;

[0043] 5-cylinder; 51-first bin; 52-second bin;

[0044] 6-the second lining plate;

[0045] 7-spiral propeller. DETAILED DESCRIPTION

[0046] The technical scheme in the embodiments of the utility model will be clearly and completely described below with the drawings in the embodiments of the utility model, apparently, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0047] Embodiment 1

[0048] Referring to the accompanying drawings Figures 1-6 The utility model discloses a cylinder structure for steel ball coal mill, including the cylinder 5 of two end closed, transmission shaft and annular storehouse,

[0049] The one end of cylinder 5 is provided with the ball adding mouth, and the coal adding mouth is provided with the both ends, the transmission shaft is coaxial in the inner chamber of cylinder 5 and is connected with fixedly, the annular outer wall of annular storehouse is bolted on the middle inner wall of cylinder 5 to divide the inner chamber of cylinder 5 into two first chamber 51 and second chamber 52 of equal volume, the annular inner wall of annular storehouse is fixed on the transmission shaft, and the annular inner wall of annular storehouse is provided with the gap to connect first chamber 51 and second chamber 52 balance material level.

[0050] As Figure 7 The utility model discloses a cylinder structure for steel ball coal mill, including the cylinder 5 of two end closed, transmission shaft and annular storehouse,

[0051] As Figure 1 The utility model discloses a cylinder structure for steel ball coal mill, including the cylinder 5 of two end closed, transmission shaft and annular storehouse,

[0052] The first ring storehouse body 1 has the outer ring surface one and two side ring surface one, and the one end of two side ring surface one is connected with the both ends of outer ring surface one along its axial direction respectively, and the other end is inclined to the central axis of first ring storehouse body 1 and the direction of mutual approach and forms the first inclined plane 11, and the one side of two first inclined planes 11 corresponding the central axis of first ring storehouse body 1 is the inner ring side of first ring storehouse body 1.

[0053] The second ring storehouse body 2 has the outer ring surface two, two side ring surface two and inner ring surface, and the outer ring surface two is coaxially adapted and fixed on the inner ring side of first ring storehouse body 1, and the one end of two side ring surface two is connected with the both ends of outer ring surface two along its axial direction respectively, and the other end is connected with the both ends of inner ring surface along its axial direction respectively, and the other end of two side ring surface two is inclined to the central axis of second ring storehouse body 2 and the direction of mutual approach and forms the second inclined plane 21.

[0054] In order to further optimize the above technical scheme, the inclination angle of second inclined plane 21 is greater than the inclination angle of first inclined plane 11. The included angle α between first inclined plane 11 and the outer ring surface one of first ring storehouse body 1 is 70 ° ~ 90 °, and the included angle β between two second inclined planes 21 on the both sides of second ring storehouse body 2 is 40 ° ~ 60 °.

[0055] See appendix Figure 3 The first and second ring silos together form a semi-conical cross-section structure. This conical structure ensures that the steel balls and raw coal can flow between the first and second silos through the gap, thus ensuring the balance of coal and ball levels in the first and second silos.

[0056] To further optimize the above technical solution, a wedge block 3 is also included. Multiple grooves 22 are provided on the inner ring surface of the second ring chamber 2. There are multiple wedge blocks 3, and multiple wedge blocks 3 are fixed one-to-one on the groove sidewalls of multiple grooves 22 facing the rotation direction of the cylinder 5.

[0057] The annular compartment divides the cylinder into a first compartment and a second compartment with equal volumes. At the same time, the annular compartment occupies space in the cylinder, thereby reducing the effective volume of the cylinder and increasing the steel ball loading coefficient inside the cylinder. The space occupied by the annular compartment is determined according to the actual amount of balls loaded inside the cylinder.

[0058] To further optimize the above technical solution, the wedge block 3 can be configured with a hollow structure. The wedge block 3 has two wedge-shaped inclined surfaces 31 and a straight plane 32 connecting the two wedge-shaped inclined surfaces 31. The included angle between the two wedge-shaped inclined surfaces 31 is... The angle is 40° to 60°. For example... Figure 1 As shown, the straight plane and the wedge-shaped inclined surface of the wedge block together form the spherical surface. The conical design can prevent the steel ball from rotating with the cylinder in the groove. The wedge block can ensure the flow of the steel ball between the two chambers, and the hollow structure can reduce the energy consumption during the rotation of the cylinder.

[0059] The ball feeding device of the double-inlet, double-outlet ball mill is located at one end of the cylinder opposite the ball feeding port. Balls are always added from one end, which results in the amount of ball in the chamber on the feeding side being greater than that on the other side. Raw coal enters the cylinder from the coal feeding ports at both ends. Sometimes the amount of coal entering at both ends is not equal, and the amount of raw coal in the chamber on the side with the larger coal intake is greater than that on the other side. Therefore, the ball and coal at the higher end can flow to the lower end through the groove. The groove design can maintain the balance of the amount of ball and raw coal in the first and second chambers. The wedge block design can prevent the ball in the groove from rotating with the cylinder, thus affecting the flow of ball between the two chambers.

[0060] Specifically, to ensure that the bottom wall of the groove is lower than the surface of the mixture of steel balls and raw coal, the groove depth of groove 22 is 150-300 mm and greater than the outer diameter of the steel balls. The design of the first and second inclined surfaces and the groove ensures the flow of steel balls and raw coal between the first and second compartments.

[0061] To further optimize the above technical solution, a first cavity 12 is formed between the two first inclined surfaces 11 on both sides of the first ring hopper 1, and a second cavity 23 is formed between the two second inclined surfaces 21 on both sides of the second ring hopper 2. The first cavity 12 and the second cavity 23 are connected. The first ring hopper and the second ring hopper form an integrated annular hollow hopper. The hollow design can avoid excessive energy consumption and resource waste caused by the excessive weight of the rotating part of the coal mill.

[0062] In some specific embodiments, a wear-resistant layer can be fixed on both the first inclined surface 11 and the second inclined surface 21. The wear-resistant layer is formed by splicing multiple first liner plates 4 or by bimetallic overlay welding.

[0063] like Figure 2 As shown, the wear-resistant layer in this embodiment is composed of multiple first liner plates spliced ​​together. Multiple bolt holes are provided on the first inclined surface 11 and the second inclined surface 21. The first liner plate 4 has a fan-shaped structure. A protruding rib 41 is fixed on the side panel away from the first inclined surface 11 or the second inclined surface 21. A countersunk hole 42 corresponding to the bolt hole is provided on the protruding rib 41. The threaded end of the fastening bolt passes through the countersunk hole 42 and the bolt hole in sequence to fasten the first liner plate 4 to the first inclined surface 11 or the second inclined surface 21.

[0064] To further improve the wear resistance of the annular chamber, NM400 wear-resistant steel plates are welded to the annular inner wall of the second chamber, the groove wall of the groove, and the outer surface of the wedge block.

[0065] To further optimize the above technical solution and facilitate the installation of the annular chamber, the annular chamber can be evenly divided into 4 to 6 sector-shaped parts along the circumference, and then welded together as a whole inside the cylinder.

[0066] To further optimize the above technical solution and improve the wear resistance of the cylinder, a second liner 6 is bolted to the inner wall of the cylinder 5. For example... Figure 8 As shown, the second liner is made of high-chromium cast iron or wear-resistant cast steel and is evenly distributed along the circumferential direction of the inner wall of the cylinder.

[0067] Example 2:

[0068] This utility model embodiment discloses a method for improving the steel ball loading coefficient of a steel ball coal mill. It adopts the annular chamber in embodiment 1, in which the outer ring surface of the first annular chamber 1 is bolted to the inner wall of the middle part of the cylinder 5; and the inner ring surface of the second annular chamber 2 is pressed against the outer wall of the drive shaft.

[0069] In a double-inlet, double-outlet ball mill, raw coal is simultaneously fed into the mill from both ends, while pulverized coal is also discharged from both ends. The amount of coal in the mill is affected by the difference between the amount of raw coal entering the mill and the amount of pulverized coal exiting the mill. When the amount of raw coal entering is greater than the amount of pulverized coal exiting, the amount of coal in the mill decreases, and vice versa. To ensure that the amount of coal in the mill remains within a reasonable range, the double-inlet, double-outlet ball mill employs a differential pressure level control system. The measurement principle of the differential pressure level control system is described in [link to documentation]. Figure 9 The upper part of the chamber is filled with air and the pressure P0 remains constant. The lower part of the chamber contains a fluid with density ρ. When a low-speed airflow flows into the chamber through the upper pressure measuring tube, the pressure P in the upper pressure measuring tube is... 上 The deviation from the pressure P0 inside the chamber is extremely small and can be ignored, i.e., P 上 =P0. The lower pressure gauge is inserted at a depth h below the fluid surface. When a low-velocity gas flows into the chamber through the lower pressure gauge, the pressure P in the lower pressure gauge is... 下 =P0 + ρgh. The pressure difference ΔP between the lower and upper manometer tubes is P = P0 + ρgh. 下 -P 上 =ρgh, so by measuring the pressure difference between the lower and upper pressure measuring tubes, the depth h of the lower pressure measuring tube inserted below the liquid surface can be calculated.

[0070] Based on this principle, two pressure measuring tubes, one upper and one lower, are installed at each end of the cylinder, see... Figure 10 The upper pressure measuring tube is located directly above the propeller 7, and the lower pressure measuring tube is located directly below the propeller 7. The lower pressure measuring tube is L-shaped, with one end of the lower pressure measuring tube cylinder bent downwards. The upper space inside the cylinder is filled with air and coal powder suspended in the air, while the lower space is filled with steel balls, raw coal particles, and fine coal powder. The steel balls and raw coal particles are mixed together, and the fine coal powder fills the gaps formed by the steel balls and raw coal particles.

[0071] A low-speed airflow passes through the pressure measuring tube. The outlet of the upper pressure measuring tube is placed in air and suspended coal powder. The pressure inside the upper pressure measuring tube is equal to the pressure inside the cylinder, i.e., P. 上 = P The lower pressure testing tube outlet is placed in a mixture of steel balls, raw coal particles, and fine coal powder. There is a sufficiently large gap between the steel balls and raw coal particles to avoid creating additional resistance to the lower pressure testing tube. However, the fine coal powder will create additional resistance to the lower pressure testing tube; that is, the fine coal powder acts as a... Figure 9 The role of the fluid. When the filling height of the gap by the fine coal powder exceeds the outlet of the lower pressure measuring pipe, the pressure inside the lower pressure measuring pipe is equal to the pressure inside the cylinder plus the resistance generated by the fine coal powder, i.e., P. 下 =P 筒 +P 粉 The resistance generated by fine coal powder is directly proportional to the depth to which the fine coal powder is buried below the outlet of the pressure measuring pipe, i.e., P 粉= a * h, a is a constant, h is the depth of the fine coal buried over the lower pressure pipe outlet, also represents the position of the fine coal in the cylinder, i.e. the material level.

[0072] The pressure difference ΔP between the lower pressure pipe and the upper pressure pipe = P 下 -P 上 = a * h, because a is a constant, it is also commonly referred to as ΔP as the material level. Install a differential pressure transmitter on the external pipeline, which can measure ΔP in real time, so as to judge the position of the fine coal in the cylinder. Within a certain range, the amount of fine coal in the cylinder is in a monotonic corresponding relationship with the total amount of coal in the cylinder, so the measured pressure difference value ΔP judges the amount of coal in the cylinder, and controls the coal supply amount of the coal feeder in real time according to ΔP, so that the total amount of coal in the cylinder is always within a reasonable range.

[0073] The condition for ensuring the normal operation of the differential pressure material level control system is that the lower pressure difference pipeline is inserted into the fine coal layer. The existing technology usually reduces the amount of steel balls in the cylinder to achieve this. As the amount of steel balls in the cylinder decreases, the total amount of steel ball, raw coal particles and fine coal mixture also decreases. When the lower pressure difference pipeline cannot be inserted into the fine coal layer, the differential pressure material level control system fails.

[0074] Therefore, in the embodiment, by installing an annular bin in the cylinder, the annular bin occupies a part of the space in the cylinder, which can reduce the effective volume in the cylinder. By reducing the effective volume of the cylinder, the steel ball loading coefficient can be improved.

[0075] The steel ball adding device of the double-in double-out steel ball mill is at one end, and steel balls are always added from one end, which will cause the amount of steel balls in the bin on one side to be greater than that on the other side. Raw coal enters the cylinder from both ends of the cylinder, and sometimes the amount of coal entering from both ends is not equal. The amount of raw coal in the bin on the side with more coal is greater than that on the other side. Through the setting of the annular groove in the second annular bin, the side with higher ball level and coal level can flow to the side with lower ball level and coal level, so as to ensure the balance of the ball level and the coal level in the first bin and the second bin. The setting of the wedge-shaped block can prevent the steel balls in the groove from rotating with the cylinder.

[0076] In the embodiment, the effective volume in the cylinder is reduced by setting the annular bin when the volume of the steel balls in the cylinder remains unchanged or decreases, which can improve the steel ball loading coefficient. The design of the groove and the wedge-shaped block can ensure the balance of the ball level and the coal level in the first bin and the second bin. The first inclined surface and the second inclined surface can lift the filling height of the mixture of steel balls, raw coal particles and fine coal, so that the steel ball loading coefficient is closer to the optimal steel ball loading coefficient, and the failed differential pressure material level control system is restored to normal.

[0077] The various embodiments described in this specification are presented by way of example, and each embodiment is presented for the purpose of conveying the novelty and inventive aspects of the present patent application. Each embodiment is presented in a progressive and explanatory manner, and each embodiment highlights differences from other embodiments. The same or similar parts and / or functions between embodiments are to be understood as mutual references among the embodiments.

[0078] The above description of disclosed embodiments is intended to be illustrative and not restrictive. Many modifications of these embodiments by one having ordinary skill in the art are intended to be within the scope of the following claims. Thus, the present patent application is not to be limited to the embodiments described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cylinder structure for a steel ball coal mill, characterized by, The cylinder (5) is provided with a ball feeding opening at one end and coal feeding openings at both ends. The cylinder (5) is provided with a ball feeding opening at one end and coal feeding openings at both ends.

2. A cylinder structure for a steel ball mill according to claim 1, wherein The annular chamber comprises a first annular chamber body (1) and a second annular chamber body (2). The first annular chamber body (1) has an outer ring surface one and two side ring surfaces one. The second annular chamber body (2) has an outer ring surface two, two side ring surfaces two and an inner ring surface.

3. A barrel structure for a steel ball mill according to claim 2, wherein The second inclined surface (21) has a larger inclination angle than the first inclined surface (11).

4. A barrel structure for a steel ball mill according to claim 2, wherein The first inclined surface (11) and the second inclined surface (21) are provided with wear-resistant layers.

5. A barrel structure for a steel ball mill according to claim 3, wherein The first inclined surface (11) and the second inclined surface (21) are provided with bolt holes.

6. A barrel structure for a steel ball mill according to claim 5, wherein The recess (22) has a groove depth of 150-300 mm and is greater than the outer diameter of the steel ball.

7. A barrel structure for a steel ball mill as claimed in claim 4, wherein, The wedge-shaped block (3) is an internal hollow structure, and the included angle between the two wedge-shaped slopes (31) of the wedge-shaped block (3) is 40°-60°. 40°-60°.

8. A barrel structure for a steel ball mill according to claim 4, wherein ​ 9. A barrel structure for a steel ball mill according to claim 2, wherein The outer ring surface of the first ring bin body (1) is bolted on the middle inner wall of the cylinder body (5); the inner ring surface of the second ring bin body (2) is tightly matched with the outer wall of the transmission shaft.

10. A barrel structure for a steel ball mill according to claim 1, wherein The inner wall of the cylinder body (5) is bolted with a second lining plate (6).

Images