CN213949780U - Coal overflow preventing protection device for coal dropping pipe - Google Patents

Abstract

The utility model discloses a coal overflow prevention protection device for a coal dropping pipe, which is characterized by comprising a switch and an L-shaped coal flow impact disc, wherein the switch is connected with an I/0 module of a local control box of a belt conveyor; the L-shaped coal flow impact disc is arranged on the switch and moves in a fan shape along with the switch action, the L-shaped coal flow impact disc is perpendicular to the overflowing coal flow direction, and the switch action is not caused by the self weight of the L-shaped coal flow impact disc. The coal overflow protection device is suitable for the protection device of the coal conveying system coal dropping pipe under the condition of coal overflow fault caused by any reason, and has great practical significance for improving the safety reliability of the coal conveying system equipment, liberating labor force, improving the automation degree and the like.

Description

Coal overflow preventing protection device for coal dropping pipe

Technical Field

The utility model relates to a belt conveyor coal breakage pipe, concretely relates to belt conveyor coal breakage pipe anti-overflow coal protection device.

Background

At present, the coal overflow phenomenon of a coal dropping pipe of a belt conveyor is mainly caused by the following two conditions, namely, firstly, when the belt conveyor continuously operates and transports materials due to the wet and sticky coal, a certain local part in a pipe wall channel inside the coal dropping pipe is long in time to stick the materials to form a bottleneck part, so that the normal material circulation is not smooth until the coal blockage and coal overflow phenomenon of the coal dropping pipe finally occur; secondly, due to the reasons that the material quantity is overlarge during the instantaneous transportation of the material, sundries mixed in the material are covered, and the like, the material is blocked instantaneously at the inlet of the coal dropping pipe, and the coal overflow fault occurs due to the non-smooth falling.

When coal overflow occurs in a coal dropping pipe of a thermal power plant, if the operation of the belt conveyor cannot be immediately stopped at the first time, the coal overflow can be accumulated on two sides of the head of the belt conveyor in a large amount, the coal is brought into a counterweight chamber along with a return belt until equipment is damaged and a system is backed up and stopped, and accidents such as fire disasters can be caused when the coal overflow is serious. The overflowed coal is cleaned, and the normal operation can be recovered after the coal is cleaned by a large amount of manpower.

The anti-blocking protection device for the coal conveying system belt conveyor coal breakage pipe in the early design of the thermal power plant is also quite different, for example, the anti-blocking protection device is of a damping type, a squeezing type or a probe type and is arranged in the coal breakage pipe, and the anti-blocking protection device is arranged in a coal breakage pipe shield, and the anti-blocking protection device is of an infrared type and the like, but has the problems of limited detection and protection, high false fault alarm rate, low reliability of the protection device, limitation in installation, and incapability of simultaneously protecting the inner part of the coal breakage pipe from being stuck and blocking coal overflow at the inlet of the coal breakage pipe. And no anti-blocking and anti-overflow protection product which is formed and widely applicable to the coal dropping pipe is available in the market. For example, taking a 2 × 600MW unit coal conveying system of a certain company as an example, a probe type anti-blocking protection device is installed on an inclined plane section of a coal drop pipe at the beginning of design, after production, through on-site actual verification, the protection device has the problems of a large number of false alarms and extremely low reliability no matter whether the system is operated or not, the protection device of the type is in a non-operation and disconnection state when the coal conveying system is put into production, and along with the transformation of the company coal conveying system, the originally designed anti-blocking protection device for the coal drop pipe is gradually removed until the coal drop pipe of the current coal conveying system is not provided with an anti-overflow protection device.

At present, most thermal power generation enterprises aim at the coal overflow prevention work of a coal conveying system coal dropping pipe, mainly according to the coal quality characteristic condition, the mode of aiming at preventing a dropping point and regularly checking the actual sticky coal of the coal dropping pipe by on-site operators is adopted for prevention and prevention, and the coal blockage prevention and overflow prevention work of the coal dropping pipe during the coal feeding period of the coal conveying system is always in a state of depending on 'people' rather than 'technology'. When the coal is fed on special coal quality or in rainy and snowy seasons, the on-site duty personnel can reduce the polling times and polling quality of other equipment on the duty, and after coal is blocked and overflowed, the cleaning work also increases the labor intensity of cleaning operators, so that the condition that the duty personnel are tired during the duty period is caused.

From the above analysis, it can be seen that to improve the automation protection degree of the coal conveying system of the thermal power plant and to liberate the original situation of preventing and preventing coal overflow by manpower, therefore, a protection device suitable for the coal conveying system coal dropping pipe under the condition of coal overflow fault caused by any reason needs to be developed, and the protection device has great practical significance for improving the safety reliability, liberation labor force, automation degree and the like of the coal conveying system equipment.

SUMMERY OF THE UTILITY MODEL

To the actual use condition of preventing blockking up anti-overflow coal protection device of coal conveying system in the current internal thermal power trade, do not have on the market with strong points, extensive applicability, reliable degree height, mature fashioned coal breakage pipe to prevent blockking up the current situation of anti-overflow coal protection product, the utility model aims at providing a coal breakage pipe anti-overflow coal protection device, applicable in coal conveying system coal breakage pipe takes place any reason and the protection device under the coal overflow fault condition appears, to the fail safe nature that improves coal conveying system equipment, liberation labour, improvement degree of automation etc. have great practical meaning.

For the purpose of the realization, the utility model discloses the protection device thinking is derived from the production site after taking place the chute, no matter take place the real chute of coal breakage pipe or the coal mouth congeals the coal momentarily when coal conveying system equipment operation in-process, all can follow the coal breakage pipe entry position and outwards overflow the coal, if at the excessive coal initial stage, the excessive coal of an extremely small amount (2-3 kilograms) strikes protection device, trigger signal forces the belt conveyor driving motor tripping operation stop motion in the operation, the excessive coal volume of significantly reducing, thereby the very first time can play protection equipment's effect, prevent that can not in time stop the belt conveyor and a large amount of excessive coal from causing more serious consequence.

The utility model adopts the technical scheme that the coal overflow preventing protection device of the coal dropping pipe is characterized by comprising a switch and an L-shaped coal flow impact disc, wherein the switch is connected with an I/0 module of a local control box of a belt conveyor; the L-shaped coal flow impact disc is arranged on the switch and moves in a fan shape along with the switch action, the L-shaped coal flow impact disc is perpendicular to the overflowing coal flow direction, and the switch action is not caused by the self weight of the L-shaped coal flow impact disc.

Further, the switch is a pull switch or a yaw switch.

Furthermore, the coal dropping pipe is provided with a coal dropping pipe dustproof shield, the L-shaped coal flow impact disc is arranged on the machine frame between the working surface and the non-working surface of the belt conveyor at the inlet section of the shield, the L-shaped coal flow impact disc and the working surface of the belt are kept to form an angle of 45 degrees during installation, and two sides of the machine frame are respectively provided with one.

Furthermore, the coal dropping pipe is not provided with a dust shield, and the L-shaped coal flow impact disc is arranged on the other three surfaces of the inlet of the coal dropping pipe, which are not close to the driving roller side of the belt conveyor, and the installation angle is 45 degrees.

The utility model has the following technical characteristics:

1. the reliability degree is high. When the transportation material of falling coal intraduct can normally fall, the utility model discloses protection device does not move, no matter any reason as long as take place the coal breakage pipe when overflowing, this protection device will start immediately, and on-the-spot actual installation can not have the possibility of malfunction, and this utility model protection device reliability degree is high.

2. The utility model discloses protection device invests in few manpower, material resources and can accomplish and realize the installation, and the input cost is few, economic nature repayment is high.

3. The applicability is wide. The protection device can be applied to all coal overflow prevention of coal falling pipes for material transportation by utilizing the belt conveyor, is not only applicable to a coal conveying system in the thermal power industry, but also applicable to industries such as coal mines, mines and the like.

4. The method solves the actual problems on site, liberates labor force and can achieve the aims of reducing personnel, lowering cost and improving efficiency. Utilize the utility model discloses protection device can realize "technical defense" to the coal breakage pipe anti-overflow coal, has solved and has relied on a large amount of manpowers to clear up the production actual problem that excessive coal, equipment operation relied on the manpower to stare at and prevent after taking place the coal blockage trouble in the past, can realize the trend requirement that the coal conveying system production site subtracts personnel or even unmanned on duty.

5. The original performance of the equipment is not influenced, and the maintenance cost is low. The protection device is easy to realize, capable of repairing the old and utilizing the waste, simple and convenient to install, free of influencing equipment operation and personnel overhaul or point inspection, and low in later maintenance and repair cost.

Drawings

Fig. 1 is a schematic view of the protection device of the present invention.

The reference numbers illustrate: the device comprises a coal dropping pipe dustproof shield 1, a dustproof shield inspection door 2, a belt conveyor driving roller 3, a switch 4, a local control box 5 and an L-shaped coal flow impact disc 6.

Fig. 2 is a schematic view of the action principle of the protection device of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the scope protected by the present invention.

The utility model discloses when the preparation of coal breakage pipe anti-overflow coal protection device was implemented, selected current belt conveyor to use the protection device that relative reliability is high to reform transform, the principle of selecting be convenient for on-the-spot good installation and equipment, reform transform few to former protection device, coal stream strikes dish convenient to detach (prevent to damage or warp and can demolish the correction), the protection reliability after reforming is high, so this actually can select to draw line switch or off tracking switch to make protection device's base support.

As shown in fig. 1, the coal overflow preventing device for the coal chute of the utility model comprises the following components: the pull switch or the deviation switch 4, the L-shaped coal flow impact disc 6, the I/0 module of the belt conveyor local control box 5, the cable, the line pipe and the like can be selected.

If the coal dropping pipe dustproof shield 1 is arranged on the machine frame between the working surface and the non-working surface of the belt conveyor at the inlet section of the shield, the L-shaped coal flow impact disc 6 and the working surface of the belt are kept at an angle of 45 degrees during installation, and two sides of the L-shaped coal flow impact disc can be respectively installed, so that the reliability is better; if the coal drop pipe is a coal drop pipe without a dust shield, the coal drop pipe can be arranged on the other three surfaces of the coal drop pipe inlet, which are not close to the driving roller 3 side of the belt conveyor, and the installation angle is the same as that of the coal drop pipe with the shield.

After the manufacturing is completed, maintenance crew need to process the L-shaped coal flow impact disc 6, the size is about 16cm x 35cm (the L-shaped coal flow impact disc can be processed according to field practice), a workpiece of the L-shaped coal flow impact disc 6 can be installed on a selected protection device and moves along with the protection device, a moving point can move in a fan shape, the L-shaped coal flow impact disc 6 is perpendicular to the overflowing coal flow direction, and the dead weight of the impact disc is guaranteed not to cause opening and closing actions; the maintenance electrical personnel need provide required protection device, to reforming transform fashioned anti-overflow protection device wiring, test.

As shown in fig. 2, the utility model discloses anti-overflow coal protection device theory of operation: in the operation process of the belt conveyor, when coal is overflowed abnormally due to coal blockage inside the coal drop pipe or the entrance of the coal drop pipe is crowded with coal, the overflowed extremely small amount of overflowed coal impacts the L-shaped coal flow impact disc 6, the impact disc is moved in a fan shape under the action of gravity, the switch 4 acts, signals are input into the centralized control PLC for logic judgment after passing through the relay of the local control box 5 of the belt conveyor, a tripping instruction is output to control the switch of the belt conveyor to trip, the belt conveyor stops operating, and the purpose of preventing the accident expansion caused by the large amount of overflowed coal is achieved.

Claims (4)

1. A coal overflow prevention protection device for a coal dropping pipe is characterized by comprising a switch (4) and an L-shaped coal flow impact disc (6), wherein the switch (4) is connected with an I/0 module of a belt conveyor local control box (5); the L-shaped coal flow impact disc (6) is installed on the switch (4) and moves in a fan shape along with the action of the switch (4), the L-shaped coal flow impact disc (6) is perpendicular to the overflowing coal flow direction, and the self weight of the L-shaped coal flow impact disc (6) does not cause the switch action.

2. The coal overflow preventing protection device of the coal chute as claimed in claim 1, wherein the switch (4) is a pull switch or an off-tracking switch.

3. The coal overflow preventing protection device of the coal dropping pipe according to claim 1, characterized in that the coal dropping pipe is provided with a dust shield (1) of the coal dropping pipe, the L-shaped coal flow impact disc (6) is arranged on the machine frame between the working surface and the non-working surface of the belt conveyor at the inlet section of the shield, the L-shaped coal flow impact disc (6) and the working surface of the belt are kept to form an angle of 45 degrees when the L-shaped coal flow impact disc is arranged, and one is arranged at each side of the machine frame.

4. The coal overflow preventing protection device of the coal chute as claimed in claim 1, wherein the coal chute is provided with no dust shield, and the L-shaped coal flow impingement plate (6) is installed on the other three surfaces of the coal chute inlet, which are not close to the belt conveyor driving roller (3), and the installation angle is 45 degrees.

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