Spiral groove grading lining plate of ball mill

Abstract

A spiral groove grading lining plate of a ball mill is characterized in that the back surface of the lining plate is attached to a cylinder arc of the ball mill and is provided with a weight-reducing and shock-absorbing back cavity; the middle upper part of the front surface of the lining plate protrudes to be the highest point, and different involute curved surfaces are arranged from the highest point to the two equal-thickness low ends for smooth transition; a convex semicircular arc and a concave semicircular arc which have the same diameter and are inclined are arranged on the surface of the lining plate to form a spiral groove; the grooves obliquely penetrate through the surface of the lining plate, concave-convex arcs are staggered at the two ends of the lining plate, and after the rough grinding bin of the ball mill is combined and installed, a plurality of continuously-through convex arc spiral grooves and concave arc spiral grooves are formed in the surface of the lining plate.

Description

Technical Field

[0001] The utility model relates to a new lining plate for a ball mill, in particular to a spiral groove grading lining plate for a ball mill in cement production industry, which can achieve the grading of grinding body sizes. Background Art

[0002] At present, the well-known ball mill is widely used in mineral processing, building materials and other industries. The grinding bodies (steel balls, steel forgings or ceramic balls, etc.) inside each chamber of the ball mill are raised by the liner and then slide down as the ball mill rotates. When the falling impact and self-rotation grinding are completed, the materials are crushed and ground into powder. The materials are pushed by the material pressure and gradually become finer before being discharged from the ball mill.

[0003] Common linings are mainly used to protect the cylinder and carry the grinding body, changing the movement trajectory of the grinding body. The coarse grinding chamber mostly uses stepped linings, and the fine grinding chamber mostly uses corrugated linings. Under the action of material pressure and wind pressure, the grinding body often has an unfavorable working condition where the large ball is pushed to the end of the chamber. The material gradually changes from coarse to fine from the inlet to the outlet of the ball mill. It is best that the grinding body can be distributed in a graded decreasing manner from front to back and from large to small under the action of the lining, so that the large ball grinds the coarse material and the small ball grinds the fine material, so that the grinding efficiency is higher.

[0004] The conventional conical grading liner that is currently used more often is heavy and large, which increases the load of the ball mill and wastes space. The slightly lighter hyperboloid grading liner will weaken its grading effect once the angle of the surface is reduced, and its ball carrying capacity is weak; the grading liner has not been widely promoted. 201110173265.8 A lifting ring groove grading liner, the overall shape of the liner is similar to the conical grading liner, the cross section is axially inclined, the rear is high and the front is low, and the surface groove is designed as a ring groove. Summary of the invention

[0005] In order to overcome the shortcomings of traditional ball mill liners, the utility model provides a ball mill spiral groove grading liner, which is installed in the coarse grinding bin of the ball mill to protect the cylinder and carry the grinding body at the same time, and can realize the graded and decreasing distribution of the grinding body from front to back and from large to small.

[0006] The utility model adopts the following technical scheme to solve the technical problems: a ball mill spiral groove grading liner is installed in the rough grinding bin of the ball mill and is fixed to the cylinder of the ball mill by bolts through bolt holes; the back of the liner fits the arc of the cylinder of the ball mill and is provided with a back cavity for weight reduction and shock absorption; the bulge in the middle and upper part of the front of the liner is set as the highest point, the two lower ends of the liner are of equal thickness, the lengths from the highest point to the two lower ends are unequal, and different involute curved surfaces are provided for smooth transition; the surface of the liner is provided with convex semicircular arcs and concave semicircular arcs of the same diameter and inclination to form a spiral groove, the diameter of the semicircular arc is designed to be 15-50mm according to the specifications of the grinding body, and the groove is designed to be at an angle of 10-25 degrees with the center line; the groove is inclined and penetrates the surface of the liner, and a concave-convex arc is displaced at both ends of the liner, that is, after the rough grinding bin liner is installed, when the lower ends of the two liner plates are butt-jointed, the convex arc is connected to the convex arc, and the concave arc is connected to the concave arc, and a plurality of continuous convex and concave spiral grooves are formed on the surface of the liner.

[0007] The beneficial effects of the utility model are as follows: the grooves on the surface of the lining plate are connected to form a forward spiral, which promotes the size classification of the grinding body. The high point of the lining plate is located in the upper middle part of the lining plate, and it extends in a smooth transition to an arc at both ends of the lining plate. There is no dead angle of materials at the high and low joints, the contact area between the groove and the grinding body is increased, and the grinding efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0009] Figure 1 It is a front view of the utility model.

[0010] Figure 2 It is a top view of the utility model.

[0011] Figure 3 It is a left view of the utility model.

[0012] In the figure: 1- spiral groove, 2- bolt hole, 3- upper and middle protrusion, 4- back cavity. DETAILED DESCRIPTION

[0013] A spiral groove grading liner for a ball mill is a steel casting mainly composed of a spiral groove 1, a bolt hole 2, a middle upper protrusion 3 and a back cavity 4.

[0014] The utility model adopts the following technical scheme to solve the technical problems: a ball mill spiral groove grading liner, which is installed in the rough grinding bin of the ball mill and fixed to the ball mill cylinder by bolts through bolt holes 2; the back of the liner fits the arc of the ball mill cylinder, and a weight-reducing and shock-absorbing back cavity 4 is provided; a bulge 3 in the middle and upper part of the front of the liner is set as the highest point, the two lower ends of the liner are of equal thickness, the lengths from the highest point to the two lower ends are unequal, and different diameter curved surfaces are provided for a smooth transition; the surface of the liner is provided with convex semicircular arcs and concave semicircular arcs of the same diameter and inclination to form a spiral groove 1, the diameter of the semicircular arc is designed to be 15-50mm according to the specifications of the grinding body, and the groove is designed to be at an angle of 10-25 degrees with the center line; the groove is inclined and penetrates the surface of the liner, and a concave-convex arc is displaced at the two lower ends of the liner, that is, after the rough grinding bin liner is installed, when the lower ends of the two liner plates are butt-jointed, the convex arc is connected to the convex arc, and the concave arc is connected to the concave arc, and a plurality of continuous convex and concave spiral grooves 1 are formed on the surface of the liner.

[0015] When the grinding body in the ball mill moves, it is subjected to backward material pressure and wind pressure. The pressure is proportional to the cross-sectional area of ​​the grinding body, that is, the square of the radius. When the grinding body is raised by the protrusion 3 in the middle and upper part of the liner, it is subjected to centrifugal force and gravity at the same time. It contacts with the inclined spiral groove 1, generating a forward component force, which is proportional to the cube of the radius of the grinding body. The forward force on the larger grinding body is greater than that on the smaller grinding body, thus producing positive classification of the grinding bodies with large forward and small backward, realizing large balls grinding coarse materials and small balls grinding fine materials, thereby improving the grinding efficiency.

[0016] Before using this utility model, the grinding bodies were in a chaotic state without being graded, or the reverse grading with the large-diameter grinding bodies at the back was abnormal. The traditional grading liner increased the load of the ball mill or had a weak ball-carrying capacity, affecting the grinding efficiency. After using this utility model, no annular grooves appear, and the inclined grooves are connected to form a forward spiral, which promotes the size classification of the grinding bodies. The high point of the liner is located in the upper middle part of the liner, and it extends to both ends of the liner in a smooth transition arc. There is no dead angle of materials at the high and low joints, and the contact area between the groove and the grinding body is increased, which greatly improves the grinding efficiency.

Claims

1. A spiral groove grading liner for a ball mill, characterized by: The surface of the lining plate is provided with convex semicircular arcs and concave semicircular arcs of the same diameter and inclination to form a spiral groove.

2. The spiral groove grading liner for ball mill according to claim 1, characterized in that: The surface of the lining plate is provided with convex semicircular arcs and concave semicircular arcs of the same diameter and inclination to form a spiral groove.

3. The spiral groove grading liner for ball mill according to claim 1, characterized in that: The semicircular arc diameter is designed to be 15-50mm depending on the specifications of the grinding body.

4. The spiral groove grading liner for ball mill according to claim 1, characterized in that: The groove is designed to be inclined at an angle of 10-25 degrees to the center line.

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