CN2875588Y

CN2875588Y - Medium speed coal mill

Info

Publication number: CN2875588Y
Application number: CN 200620028288
Authority: CN
Inventors: 李战国; 袁鸿飞
Original assignee: CHANGCHUN GENERATING EQUIPMENT Co Ltd
Current assignee: CHANGCHUN GENERATING EQUIPMENT Co Ltd
Priority date: 2006-02-22
Filing date: 2006-02-22
Publication date: 2007-03-07
Anticipated expiration: 2016-02-22

Abstract

A medium-speed coal mill belonging to the crushing device technical filed relates to a power house fuel coal mill. The utility model includes a bracket, an inlet passage on upper part of the bracket for the entrance of the raw coal, an outlet passage on the upper part of the bracket for the exit of coal powder, a millstone drive motor arranged at the lower part of the bracket, a reducer connecting the motor, a rotary millstone on the reducer, a grinding roller pressed on the millstone, a loading frame which is connected with the grinding roller shaft over the grinding roller and a cylinder loading oil supply mechanism. The improvement is that a counterforce hydraulic loading mechanism consisting of a counterforce oil pump, a throttle valve, a proportional relief valve and an energy accumulator is added on the pipeline which is connected with the cylinder non-rod chamber and the oil tank. The active effects of the utility model are that the added counterforce hydraulic loading control mechanism is able to absorb the vibration of the coal mill, and makes the working rotate speed improved by over 25% and the maximum load improved by over 65%, largely improving the output of the coal mill and the automatic control performance of the coal mill.

Description

A kind of medium-speed pulverizer

Technical field

The utility model belongs to the disintegrating apparatus technical field, is specifically related to power plant bunker coal flour mill.

Background technology

The coal pulverizer that uses in places such as power plants comprised frame in the past, be installed in the mill drive motor of frame lower, the reductor that connects motor, be positioned at the rotary grinding disk above the reductor, be pressed in the grinding roller on the mill, the loading frame that the grinding roller top is connected with grinding roller is fixed on the load cylinder on the basis, pull bar between oil cylinder and the loading frame, oil cylinder oil supply mechanism of forming by fuel tank, oil pipe, oil pump, choke valve, overflow valve and raw coal enter passing away with coal dust.The hydraulic loading system of existing coal pulverizer is only controlled the oil pressure of cylinder rod chamber by a proportional pressure control valve or electromagnetic relief valve, oil cylinder rodless cavity does not have pressure during coal pulverizer work, oil cylinder piston can rise when relatively large material process is milled the zone, then under pressure, grinding roller descends, impact mill, produce vibration, because this vibration aggravates with the increase and the increase of the pressure between grinding roller and the mill of mill revolution, for vibration is in the scope of operate as normal permission, existing product is as the MPS225 type coal pulverizer of in industry having finalized the design, its revolution only can reach 24.1r/min, and the on-load pressure maximum has only 450KN/m ²Because the rotating speed of mill and the pressure between grinding roller and mill do not increase the space, have limited the lifting of pulverizer capacity.

Summary of the invention

The purpose of this utility model provides a kind of medium-speed pulverizer, overcomes existing coal pulverizer above shortcomings.

The utility model comprises the frame of existing coal pulverizer, the raw coal of upper rack enter passing away with coal dust, be installed in the mill drive motor of frame downside, the reductor that connects motor, be positioned at the rotary grinding disk above the reductor, be pressed in the grinding roller on the mill, the loading frame that the grinding roller top is connected with grinding roller, be fixed on the load cylinder on the basis, pull bar between oil cylinder and the loading frame, by fuel tank, oil pipe, oil pump, proportional pressure control valve, accumulator, the oil cylinder that electric control element is formed loads oil supply mechanism, and the improvement of being done is to set up by the reaction force oil pump on the pipeline that connects oil cylinder rodless cavity and fuel tank, choke valve, proportional pressure control valve, the reaction force hydraulic loaded mechanism that accumulator is formed.

Good effect of the present utility model is: the reaction force hydraulic loaded controlling organization of being set up, can absorb the vibration of coal pulverizer, thereby the ratio of coal mill foundations piece was reduced to 3: 1 by 5: 1, on original 225 type coal pulverizers, set up reaction force hydraulic loaded controlling organization, its revolution can increase to 29.9r/min, and the on-load pressure maximum can reach 750KN/m ², the working speed of mill is improved more than 25%, improve maximum load power more than 65%, expand the live load scope of coal pulverizer.By increasing the working speed of mill, improve the mill stroke of coal pulverizer in the unit interval, thereby increase pulverizer capacity; By improving loading force, the efficient of coal pulverizer broken material is improved, reduce the circulating ratio of material in the coal pulverizer, thereby improve pulverizer capacity, reduce coal pulverizer body resistance.

Description of drawings.

Fig. 1 is the utility model coal pulverizer overall structure schematic diagram;

Fig. 2 is the utility model hydraulic system schematic diagram.

The specific embodiment

By prior art manufacturing and assembling frame 2, upper rack raw coal being installed enters and the coal dust passing away.Fixedly the bottom is installed the reductor 3 that connects motor, rotary grinding disk 4 is installed above the reductor in mill drive motor 1, the frame on the basis under the frame, grinding roller 5 is pressed on the mill, install that the loading frame 6, the load cylinder 8 that are supported on the grinding roller axle are fixed on the basis above the grinding roller, is connected, connects fuel tanks 10 and oil cylinder 8 rod chambers with pipeline 9 with pull bar 7 between oil cylinder piston bar and the loading frame, with the rodless cavity of pipeline 11 connection fuel tanks 10 and oil cylinder 8.Install on pipeline 9 and load oil pump 12, reach accordingly, proportional pressure control valve 13 loads accumulator 14.Reaction force oil pump 15 is installed on the pipeline 11 of the rodless cavity that connects fuel tank 10 and oil cylinder 8, and corresponding choke valve 16, proportional pressure control valve 17, reaction force accumulator 18.With electric control element 19 connected control systems, promptly finish enforcement of the present utility model.

The course of work of present embodiment is: start the mill drive motor, add raw coal, grinding machine enters duty.The loading force of coal pulverizer is from the dead weight and the outside active force of the parts of milling (roller, loading frame and pull bar).Applied external force mainly is to be produced by the oil pressure that acts on the hydraulic cylinder rod chamber (pressure of milling).Reaction force is to be produced by the oil pressure of rodless cavity (buffer brake), can be absorbed in effectively in the running and unload or roll the unexpected vibration that moves both vertically and produce of grinding roller in the process because of the pressure portion of milling.In the coal pulverizer running, because the bulk materials in the coal causes system overpressure, unnecessary pressure is stored in the accumulator, and system pressure carries out pressure again and discharges in the retrieval system when low, so reduces by accumulator because the impact that unexpected load causes.

In fact, the vibration of coal pulverizer is just in vertical direction, and the operation principle of explaining above can guarantee effectively to avoid oscillation phenomenon.

Hydraulic cylinder can obtain pressure oil at rodless cavity and rod chamber simultaneously.Two strands of oily streams are continuous, turn back in the fuel tank under the effect of active force control ratio overflow valve and reaction force control ratio overflow valve.Electric control element control ratio overflow valve makes rod chamber and rodless cavity oil pressure reach the force value of setting, and the reaction pressure scope of MPS225 type coal pulverizer is between 1.0～5.0MPa as the aforementioned.

Claims

1, a kind of medium-speed pulverizer, comprise frame, the raw coal of upper rack enter passing away with coal dust, be installed in the mill drive motor of frame downside, the reductor that connects motor, be positioned at the rotary grinding disk above the reductor, be pressed in the grinding roller on the mill, the loading frame that the grinding roller top is connected with grinding roller, be fixed on the load cylinder on the basis, pull bar between load cylinder and the loading frame, by fuel tank, the pipeline that connects fuel tank and cylinder rod chamber, load oil pump, proportional pressure control valve, accumulator, the oil cylinder that electric control element is formed loads oil supply mechanism, it is characterized in that: set up by the reaction force oil pump on the pipeline that connects oil cylinder rodless cavity and fuel tank, choke valve, proportional pressure control valve, the reaction force hydraulic loaded mechanism that accumulator is formed.