High-efficiency feeding scraper device for grinding mill

Abstract

The invention discloses a high-efficiency feeding scraper device for a grinding mill, comprising a scraper mechanism for throwing materials to a grinding zone formed between a grinding roller and a grinding ring, the scraper mechanism comprising a scraper plate mounted on a scraper seat, the scraper seat being mounted on a scraper frame rotating synchronously with the grinding roller through a plate structure connected by bolts, the front end of the scraper plate being low and the rear end being high, the upper plate body of the scraper plate in the grinding zone being bent backward and downward at an angle so that the inclination angle of the upper plate body is smaller than the inclination angle of the middle and lower plate body of the scraper plate outside the grinding zone; the bolted plate structure comprises a radially and vertically arranged mounting plate I and mounting plate II, mounting plate I being mounted on the scraper frame, mounting plate II being mounted on the scraper seat and being arranged on the front side or the rear side of mounting plate I, and mounting plate I and mounting plate II being connected by evenly distributed bolt assemblies. The scraper mechanism of the invention has strong impact resistance and a large feeding balance area, thereby improving the working stability and production efficiency of the grinding mill.

Description

Technical Field

[0001] The invention relates to the internal structure of a grinding mill, in particular to a high-efficiency feeding scraper device for a grinding mill. Background Art

[0002] Grinding mills are widely used in mining, chemical, construction, metallurgy and other industries and for crushing various dry powder materials.

[0003] The working principle of the grinding mill is as follows: the material is fed into the grinding chamber of the grinding main machine evenly and continuously, and the scraper repeatedly scoops up the material and adds it to the grinding area formed between the grinding roller and the grinding ring for grinding. It can be seen that the scraper plays an extremely important role in the grinding process.

[0004] The scraper of the prior art is installed at an angle, and each grinding roller is provided with a scraper for scooping up and throwing the material to form a material flow in the grinding area. However, the problem is that the material flow thrown in the grinding area is too concentrated and unbalanced, which affects the grinding efficiency of the grinding roller and causes low production efficiency. Moreover, the scraper is installed on the scraper frame through a scraper seat, and a group of bolt assemblies are used to fasten the scraper seat and the scraper frame. If the scraper encounters an obstacle and collides with it during operation, the bolt assembly is easily broken by the shear force, causing damage to the scraper and requiring shutdown for maintenance, which greatly affects the normal operation of the grinding host and delays the operation process.

[0005] In order to solve the problem of low production efficiency of scraper blades in the prior art, the utility model patent with authorization announcement number CN205731446U discloses a "multi-layer scraper for Raymond mill". Its technical solution is to set the scraper structure to at least two layers of scraper plates. The scraper scoops up the material and throws it to the grinding area through more than two layers of scraper plates. Since the throwing distribution is more uniform, the working efficiency of the grinding roller and grinding ring can be greatly improved.

[0006] However, the blade structure of the "Multi-layer Blade for Raymond Mill" has a complex structure and a larger size due to the increase in the number of layers, which not only increases the production cost but also occupies the grinding room space. Summary of the invention

[0007] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to propose a high-efficiency feeding blade device for a grinding mill which can operate stably and has high working efficiency.

[0008] The high-efficiency feeding scraper device of the grinding mill capable of solving the above technical problems comprises a scraper mechanism for throwing the material to the grinding area formed between the grinding roller and the grinding ring, the scraper mechanism comprises a scraper plate mounted on a scraper seat, the scraper seat is mounted on a scraper frame rotating synchronously with the grinding roller through a plate structure connected by bolts, the front end of the scraper plate is low and the rear end is high, the difference is:

[0009] 1. The upper plate of the shovel plate in the grinding area is bent backward and downward at an angle so that the inclination angle of the upper plate is smaller than the inclination angle of the middle and lower plate of the shovel plate outside the grinding area.

[0010] 2. The bolt-connected plate structure includes radially and vertically arranged mounting plate I and mounting plate II, wherein mounting plate I is installed on the blade frame, and mounting plate II is installed on the blade seat and is arranged on the front or rear side of mounting plate I, and mounting plate I and mounting plate II are connected by evenly distributed bolt assemblies.

[0011] Furthermore, the upper plate is located at the lower part of the grinding area.

[0012] Conventionally, inner and outer sides of the middle and lower plate body are respectively provided with inner and outer protective material strips.

[0013] Beneficial effects of the present invention:

[0014] 1. In the structure of the efficient feeding scraper device of the grinding mill of the present invention, since the inclination angle of the upper plate body of the scraper plate is smaller than the inclination angle of the middle and lower plate bodies, the scraper plate not only has the function of throwing materials, but also has the function of throwing materials after receiving them. Therefore, materials can be thrown at the upper and lower parts of the grinding area (balanced feeding), which increases the area of ​​the grinding roller to grind materials and further improves work efficiency.

[0015] 2. The structure of the scraper mechanism of the present invention is particularly simple and can be modified on the scraper plate of the prior art, with low cost and significant effect.

[0016] 3. In the structure of the present invention, the blade mechanism is installed on the blade frame through a plate structure connected by bolts, which improves the mechanical properties of the blade mechanism and changes the force of the bolt assembly that fixes the blade mechanism from shear force to tensile force, greatly improving the bearing capacity of the bolt assembly, that is, the impact resistance of the blade mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an axonometric view of an embodiment of the present invention.

[0018] Figure 2 for Figure 1 Front view of an embodiment.

[0019] Figure 3 for Figure 2 Top view (removing the grinding roller device).

[0020] Figure 4 for Figure 1 An isometric view of a blade carriage in accordance with an embodiment.

[0021] Figure 5 for Figure 1 A front view of a blade mechanism in an embodiment.

[0022] Figure 6 for Figure 5 Top view of the .

[0023] Figure 7 for Figure 5 Side view of.

[0024] Figure number identification: 1. Grinding roller; 2. Grinding ring; 3. Shovel plate; 3-1. Upper plate body; 3-2. Middle and lower plate body; 4. Inner material protection strip; 5. Outer material protection strip; 6. Shovel seat; 7. Bolt-connected plate structure; 8. Shovel frame; 9. Mounting plate I; 10. Mounting plate II; 11. Plum blossom frame; 12. Main shaft of main machine; 13. Grinding roller assembly. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described below in conjunction with the embodiments shown in the accompanying drawings.

[0026] The high-efficiency feeding scraper device of the grinding mill of the present invention comprises a scraper plate 3 arranged between the front and rear grinding rollers 1, each grinding roller 1 revolving on the grinding roller assembly 13 rolls on the grinding ring 2 in a self-rotating manner, and a grinding area is formed between each grinding roller 1 and the grinding ring 2. The grinding roller assembly 13 is installed on the main shaft 12 of the main machine through a plum blossom frame 11, and the plum blossom frame 11 is connected to a scraper frame 8 sleeved on the main shaft of the main machine. The lower part of the scraper frame 8 is in the grinding chamber below the grinding area. The scraper plate 3 is tiltedly arranged on the scraper seat 6, and its front end is low and the rear end is high. The scraper seat 6 is installed on the bottom of the scraper frame 8 through a plate structure 7 connected by bolts. Each scraper plate 3 in operation scoops up the material in the grinding chamber and throws it to the grinding area for crushing, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, Figure 3 The middle arrow indicates the direction in which the shovel plate 3 throws the material toward the grinding area.

[0027] The shovel plate 3 includes an upper plate 3-1 in the grinding area and a middle and lower plate 3-2 outside the grinding area. The upper plate 3-1 is a wedge (small at the rear end and large at the front end) that fits between the corresponding grinding roller 1 and the grinding ring 2. The rear end of the middle and lower plate 3-2 is connected to the front end of the upper plate 3-1. The front end (inside the grinding chamber) of the middle and lower plate 3-2 is wider than the rear end. An outer material protection strip 5 is provided on the outer edge of the middle and lower plate 3-2, and an inner material protection strip 4 is provided on the inner edge of the middle and lower plate 3-2. Figure 5 , Figure 6 , Figure 7 shown.

[0028] After the upper plate 3-1 is bent backward and downward at an angle, the inclination angle of the upper plate 3-1 (angle A with the horizontal plane) is smaller than the inclination angle of the middle and lower plate 3-2 (angle B with the horizontal plane). After the inclination angle is reduced, the rear end of the upper plate 3-1 is aligned with the lower position of the grinding roller 1. Figure 5 , Figure 7 shown.

[0029] In the prior art, the upper plate 3 - 1 and the middle and lower plate 3 - 2 of the scraping plate 3 have the same inclination angle, that is, the inclination angle of the upper plate 3 - 1 is equal to the inclination angle of the middle and lower plate 3 - 2.

[0030] The bolt-connected plate structure 7 includes radially and vertically arranged mounting plates Ⅰ9 and Ⅱ10, wherein the mounting plate Ⅰ9 is welded to the bottom of the scraper frame 8, and the mounting plate Ⅱ10 is welded to the inner side of the scraper seat 6 and is located at the rear side of the mounting plate Ⅰ9, and the mounting plate Ⅰ9 and the mounting plate Ⅱ10 are connected by evenly distributed bolt assemblies; the scraper plate 3 scrapes the material forward and feeds the material backward to the grinding area under the drive of the scraper frame 8 (rotating synchronously with the grinding roller assembly 13), and the bolts in each bolt assembly bear the tensile force in the circumferential tangential direction, such as Figure 1 , Figure 2 , Figure 3 shown.

[0031] In the prior art, the bolt-connected plate structure 7 is arranged perpendicular to the radial direction, and the bolts in each bolt assembly are subjected to shear force in the circumferential tangent direction. From the principles of structural mechanics, it can be known that the tensile force of the bolt is much greater than its shear force. Therefore, the impact resistance of the bolt-plate group in the present invention is much greater than the impact resistance of the traditional bolt-plate group in the prior art.

[0032] The present invention changes the inclination angle of the upper plate 3-1 of the shoveling plate 3 in the prior art, so that the unground material thrown to the upper part between the grinding roller 1 and the grinding ring 2 is received by the upper plate 3-1 when it falls and thrown to the lower part between the grinding roller 1 and the grinding ring 2 for a second time to be ground, thereby increasing the material area of ​​the grinding area to achieve the purpose of improving work efficiency; by changing the bolt plate group structure in the prior art, the impact resistance of the shoveling mechanism is greatly improved, so that the shoveling mechanism is not easily damaged when encountering obstacles, effectively improving the working stability of the shoveling mechanism, reducing maintenance time, and improving the working efficiency of the grinding mill.

Claims

1. A high-efficiency feeding scraper device for a grinding mill, comprising a scraper mechanism for throwing materials into a grinding area formed between a grinding roller (1) and a grinding ring (2), the scraper mechanism comprising a scraper plate (3) mounted on a scraper seat (6), the scraper seat (6) being mounted on a scraper frame (8) rotating synchronously with the grinding roller (1) via a plate structure (7) connected by bolts, the front end of the scraper plate (3) being low and the rear end being high, and characterized in that: The upper plate body (3-1) of the shovel plate (3) in the grinding area is bent backward and downward at an angle so that the inclination angle of the upper plate body (3-1) is smaller than the inclination angle of the middle and lower plate body (3-2) of the shovel plate (3) outside the grinding area; the bolt-connected plate structure (7) includes radially and vertically arranged mounting plates I (9) and II (10), wherein the mounting plate I (9) is installed on the shovel frame (8), and the mounting plate II (10) is installed on the shovel seat (6) and is arranged on the front side or the rear side of the mounting plate I (9), and the mounting plate I (9) and the mounting plate II (10) are connected by evenly distributed bolt assemblies.

2. The high-efficiency feeding blade device for a grinding mill according to claim 1, characterized in that: The upper plate (3-1) is located at the lower part of the grinding area.

3. The high-efficiency feeding blade device for a grinding mill according to claim 1 or 2, characterized in that: An inner material protection strip plate (4) and an outer material protection strip plate (5) are respectively provided on the inner and outer sides of the middle and lower plate body (3-2).

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