CN201211486Y - Ball mill steel ball automatic optimization device - Google Patents

Abstract

The utility model discloses an automatic steel ball optimization device for a ball mill coal mill, which comprises a ball mill, a slot liner plate is installed on the outlet end cover of the ball mill, an inner spiral pipe is arranged in the outer spiral pipe of the ball mill outlet, and the outlet of the inner spiral pipe is A ball receiving groove is installed at the end of the ball receiving groove, a ball losing pipe is connected below the ball receiving groove, and a ball collector is connected with the outlet end of the ball losing pipe. The steel ball automatic optimization device of the ball mill of the utility model solves the problem that the coal mill cannot run at full output for a long time, and makes the ratio of the steel ball loading in the coal mill reach the best, achieving the purpose of saving energy consumption and cost . It can also reduce the jamming of small steel balls on the lining tile, which will cause the lining tile to break.

Description

Ball mill steel ball automatic optimization device

technical field

The utility model belongs to an auxiliary device in a thermal power plant, in particular to an automatic optimizing device for ball mill steel balls.

Background technique

Steel ball coal mill (also known as ball mill) is a low-speed coal mill with a speed of 16-25 rpm. It uses a low-speed rotating drum to drive the steel balls in the drum to move, and through the impact and extrusion of the steel balls on the raw coal, The crushing and grinding of coal lumps is achieved by pressing and grinding to make coal powder. The diameter of the standard steel ball is generally 30mm~60mm. After the steel ball coal mill runs for a period of time, the steel balls in the coal mill gradually become smaller due to wear. When the diameter of the steel ball is less than 25mm, the impact effect of the steel ball on the coal particles is basically When a large number of small steel balls accumulate in the coal mill, it will have a great impact on the output of the coal mill. At present, power plants regularly stop grinding and disintegrate to clean the steel balls, especially when the quality of the steel balls is poor. In a short time, it is necessary to clean the steel balls of the coal mill.

Steel ball coal mill is an important equipment in thermal power plants. It has a large volume and weight and high power consumption. A 670T/H boiler needs to be equipped with two DTM350/600 ball mills, which are driven by four 550KW motors respectively, and the daily power consumption is about 100,000 kWh. Therefore, whether the coal mill can work at full load directly affects the economic benefits of the power plant. According to the applicant's statistical comparison of the mill output before and after the steel balls are cleaned each time in the power plant, the difference in the output of the coal mills before and after the steel balls is about 10%. After long-term impact and wear of the steel ball, when the diameter is smaller than the specified size, the output of the coal mill will be reduced, and the power consumption of the plant will increase, which will also affect the output of the boiler, reduce the power generation, and cause waste of resources.

At present, the steel balls of coal mills in most thermal power plants in China are manually screened after the grinding is stopped, and the manhole door is opened. There are problems such as high labor intensity, harsh working environment, and high resistance of the staff, especially for coal grinding without screw lining tiles. Unqualified steel balls can only be manually screened after the coal mill is disassembled, and cannot be completed by other methods. For a long time, steel ball screening control has long plagued the technicians of power plants and has become a major problem for scientific researchers to solve. .

Contents of the invention

In view of the above-mentioned problems in the prior art, the purpose of this utility model is to provide an automatic selection device for steel balls of a ball coal mill, which can automatically screen out steel balls smaller than a specified size during the normal operation of the mill.

In order to realize above-mentioned task, the utility model adopts following technical solution:

An automatic optimization device for steel balls of a ball mill, including a ball mill, characterized in that a slot liner is installed on the outlet end cover of the ball mill, an inner spiral tube is arranged in the outer spiral tube of the ball mill outlet, and the outlet end of the inner spiral tube is A ball receiving groove is installed, a ball losing pipe is connected under the ball receiving groove, and a ball collector is connected with the outlet end of the ball losing pipe.

The steel ball automatic optimization device of the ball mill of the utility model solves the problem that the coal mill cannot run at full output for a long time, makes the ratio of the steel ball loading in the coal mill the best, and can also reduce the gap of small steel ball jamming Lining tiles, resulting in lining tile cracking.

Description of drawings

Fig. 1 is the structural representation of the present utility model; The label among the figure represents respectively: 1, slot liner, 2, internal helical pipe, 3, outer helical pipe, 4, catch ball groove, 5, lose ball pipe, 6, Ball collector, 7, maintenance and observation hole.

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Detailed ways

In the embodiment shown in Figure 1, the ball mill steel ball automatic optimization device includes a ball mill, a slot liner 1 is installed on the outlet end cover of the ball mill, and an inner spiral tube 2 is added in the outer spiral tube 3 of the original ball mill outlet. The outlet of the inner helical tube is equipped with a ball receiving groove 4, the ball receiving groove 4 below is connected with a ball losing pipe 5, and the outlet of the ball losing pipe 5 is connected with a ball collector 6.

Slot liner 1 is provided with several strip leak holes, and a ball outlet channel is provided between the liner and the end cover. The outlet end surface between the inner helical tube 2 and the outer helical tube 3 is closed, and there are several ball outlets on the circumferential surface of the outlet end of the inner helical tube 2, and the steel balls are thrown radially from the inner helical tube 2 ball outlets .

The ball receiving groove 4 is in the shape of an arc with an included angle of 30°, and is arranged between 50° and 80° between the rotation direction of the ball mill outlet and the horizontal direction. One end of the ball-losing pipe 5 stretches into the ball mill and links to each other with the ball receiving groove 4, and one end links to each other with the ball receiver 6 outside the ball mill, and an inspection and observation hole 7 is provided at the exposed place of the ball-losing pipe near one end of the ball mill.

The working principle of the utility model is: when the ball mill is working, the small balls are mainly accumulated at the outlet end of the coal mill. With the addition of new coal and new balls, the small balls are pushed to continuously accumulate towards the outlet side of the coal mill. There are a series of slotted holes on the lining plate of the outlet end cover. When the steel balls pass through the slotted hole lining plate with the designed opening, the steel balls smaller than the specified size enter the inner channel of the lining plate through the slot holes, and are brought into the mill cylinder through the rotation of the mill cylinder. In the channel between the inner and outer helical tubes, there are several ball outlets on the circumference of the outlet end of the inner helical tube. The steel balls are guided by the helical wire into the ball outlets and thrown out in the radial direction, then enter the ball receiving groove, and enter through the ball delivery tube. The ball collector optimizes the ratio of steel ball loading in the coal mill to achieve the purpose of saving energy and cost. Open the ball collector regularly to get the balls to prevent clogging.

Claims (5)

1. A ball mill steel ball automatic screening device, comprising a ball mill, is characterized in that a slot liner (1) is installed on the outlet end cover of the ball mill, and an inner helical tube is arranged in the outer helical tube (3) of the ball mill outlet (2), the outlet end of the inner helical tube (2) is equipped with a ball receiving groove (4), the ball receiving groove (4) is connected with the ball losing pipe (5) below, and the outlet end of the ball losing pipe (5) is connected with a ball receiving device (6). 2. The ball mill steel ball automatic screening device as claimed in claim 1, characterized in that, the slot liner (1) is provided with a plurality of strip-shaped leakage holes, between the slot liner (1) and the ball mill outlet A ball outlet channel is provided between the end covers. 3. The ball mill steel ball automatic screening device as claimed in claim 1, characterized in that, the outlet end face between the inner helical tube (2) and the outer helical tube (3) is closed, and the inner helical tube ( 2) There are multiple ball outlets on the peripheral surface of the outlet end, and the steel balls are thrown radially from the ball outlet of the inner helical tube (2) through the channel of the outer helical tube (3). 4. The ball mill steel ball automatic screening device according to claim 1, characterized in that, the ball receiving groove (4) is in the shape of an arc with an included angle of 30°, and is formed in the direction of rotation of the outlet of the ball mill with the horizontal direction. Arranged between 50° and 80°. 5. The ball mill steel ball automatic screening device as claimed in claim 1, characterized in that, one end of the ball losing pipe (5) extends into the ball mill to connect with the ball receiving groove (4), and the other end is outside the ball mill to connect with the receiving groove (4). The ball device (6) links to each other, and an inspection and observation hole (7) is provided at the exposed place near one end of the ball mill in the ball losing pipe (5).

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