CN217597471U

CN217597471U - Negative pressure air curtain dust removal system of concrete mixing plant

Info

Publication number: CN217597471U
Application number: CN202221501394.5U
Authority: CN
Inventors: 吴建忠
Original assignee: Hebei Juzong New Material Technology Co ltd
Current assignee: Hebei Juzong New Material Technology Co ltd
Priority date: 2022-06-15
Filing date: 2022-06-15
Publication date: 2022-10-18
Anticipated expiration: 2032-06-15

Abstract

The utility model discloses a concrete mixing plant negative pressure air curtain dust pelletizing system, in order to solve the technical problem that the dust collection efficiency of concrete mixing plant is low, dust pelletizing system is including a set of aggregate storehouse and the ground storehouse that are used for the concrete batching that are used for saving the concrete raw materials, and the key is, and the aggregate storehouse is door storehouse formula structure, all is provided with the suction hood that the opening is the rectangular formula on the door beam of aggregate storehouse and the pan feeding mouth top in ground storehouse, and the suction hood is connected with the dust remover with the help of pipeline, the air intake aspect ratio of suction hood be (20-40): 1. the beneficial effects of the utility model are that, to the design of suction hood, on the basis that does not occupy aggregate storehouse space, the setting for of aspect ratio has greatly improved the negative pressure value in the transfer passage, when dust concentration is great, can also utilize the further increase aspect ratio of width adjusting device, makes the air intake of suction hood more approach the slit, and the negative pressure effect further increases, has improved dust removal effect.

Description

Negative pressure air curtain dust removal system of concrete mixing plant

Technical Field

The utility model belongs to the technical field of the environmental protection is removed dust, involve the dust pelletizing system in premixing the stirring station, especially a dust pelletizing system of negative pressure gas curtain.

Background

The ready-mixed concrete mixing plant is generally provided with an aggregate bin and a ground bin, wherein the aggregate bin is mainly used for storing aggregate used for producing various types of concrete, and the ground bin is used for proportioning and weighing and mixing the concrete. In the concrete production process, the aggregate is loaded by a forklift, and the dusty aggregate can generate a large amount of dust when being loaded, so that the environment is greatly influenced.

The stirring station in the prior art adopts the measure of spraying water to aggregate for dust fall at the beginning, the dust fall effect cannot reach the expectation, and the quality control difficulty of aggregate production is also increased by using excessive water spraying. Later, an industrial dust remover is additionally arranged in the mixing station, and because the size of a dust removing cover is large due to the large space of the aggregate bin, the distance between a dust removing air suction opening and a dust raising point is also large, and large air exhaust volume and high negative pressure value are needed. The aggregate bins of the mixing plant are more. The company is provided with 6 sets of stirring units, and the total number of the stirring units is 30 aggregate bins and 3 ground bin outlets. The existing dust removal technology needs to invest higher equipment installation cost, and the dust removal effect cannot be achieved.

SUMMERY OF THE UTILITY MODEL

The utility model aims at improving concrete mixing plant's dust collection efficiency's technical problem, designed a concrete mixing plant negative pressure air curtain dust pelletizing system, adopted negative pressure air curtain, fixed point to open, dust concentration starts, the invariable negative pressure of inverter motor etc. technique to relatively lower equipment cost drops into and reaches dust removal effect with energy resource consumption.

The technical scheme that the utility model discloses a, a concrete mixing plant negative pressure air curtain dust pelletizing system, including a set of aggregate storehouse and the ground storehouse that are used for storing the concrete raw materials, the key is, the aggregate storehouse is a door storehouse formula structure, all is provided with the suction hood that the opening is the rectangular formula on the door roof beam of aggregate storehouse and the pan feeding mouth top in ground storehouse, the suction hood is connected with the dust remover with the help of pipeline, the air intake aspect ratio of suction hood be (20-40): 1.

and a normally closed ventilation valve is arranged in the dust hood, and the controlled end of the ventilation valve is connected with a control unit of the dust remover.

The vent valve is an electromagnetic valve or a normally closed pneumatic valve.

The dust remover adopts an industrial pulse dust remover, and a variable frequency fan and a frequency converter are adopted in the dust remover.

An induction switch is installed on a dust collection cover of the aggregate bin, a signal output end of the induction switch is connected with a control unit, and the control unit is connected with a dust remover.

Dust concentration monitors are arranged on the dust collection covers of the aggregate bin and the ground bin, the signal output ends of the dust concentration monitors are connected with a control unit, and the control unit is connected with a dust remover.

The air inlet of the dust hood is provided with a width adjusting device, and the width of the air inlet can be adjusted to achieve the negative pressure adjusting value under the condition of the same air exhaust amount.

The beneficial effect of the utility model is that,

1. a plurality of aggregate bins share one dust remover, so that the number of the dust removers is reduced under the condition of the same number of dust removing points, and the investment cost of equipment is reduced.

2. The variable frequency motor is adopted, the range of the negative pressure value is set, the power of the fan motor is reduced under the condition of the same negative pressure value, and the energy consumption for dust removal is reduced.

3. Because the material loading of aggregate is respectively the material loading generally, almost do not exist and need not separate aggregate simultaneous feeding more, consequently according to inductive switch and dust concentration monitor's signal acquisition, can realize intelligent control, open alone moreover, like this although the dust remover is shared to the multichannel, each way all fully utilized the power of dust remover when the use in fact, the negative pressure value is relatively higher, rationally utilized the energy.

4. The design of the dust hood, the length-width ratio is set to be (20-40): 1, on the basis that does not occupy aggregate storehouse space, the setting for of aspect ratio has greatly improved the negative pressure value in the transfer passage, when dust concentration is great, can also utilize width adjusting device further to increase the aspect ratio, makes the air intake of suction hood more be close to the slit, and the negative pressure effect further increases, has improved dust removal effect.

Drawings

FIG. 1 is a schematic structural view of the concrete mixing and dedusting system of the present invention.

Fig. 2 is a control circuit schematic diagram of the dust removing system of the utility model.

In the attached drawings, 1 represents an aggregate bin, 2 represents a ground bin, 3 represents a dust hood, 3-1 represents a vent valve, 3-2 represents a width adjusting device, 4 represents a conveying pipeline, 5 represents a dust remover, 6 represents a sensing switch, 7 represents a dust concentration monitor, and 8 represents a control unit.

Detailed Description

The structure principle of the dust removing system of the present invention is specifically described with reference to fig. 1 and 2.

When the system is implemented specifically, various concrete aggregates are respectively discharged into the aggregate bin 1 by the feeding vehicle, when the feeding vehicle is sensed by the inductive switch 6 in the aggregate bin 1, the dust remover 5 is started by the control unit 8, and meanwhile, the vent valve 3-1 arranged in the current aggregate bin 1 is also opened at the same time to remove dust. Because the aggregate bin 1 adopts a mode of three vertical surfaces and a top surface enclosing wall, the floated and sunk materials can be efficiently discharged through the dust hood 3 arranged at the top of the doorway. And although the dust hood 3 is arranged in all the aggregate bins 1, the other dust hoods 3 are kept in a closed state through the independent control on the ventilation valve 3-1, so that the negative pressure in the conveying pipeline 4 can be ensured. The length-width ratio of the air inlet of the dust hood 3 is set to be (20-40): 1, also in order to guarantee to have great exhaust range, reduce the width, form higher negative pressure effect at air inlet department. The time for removing dust can be set.

In addition, the dust concentration detectors 7 are arranged in the aggregate bins 1 and above the openings of the ground bins 2, when the dust concentration detected by any one of the aggregate bins 1 or the openings of the ground bins 2 reaches a first threshold value, the control unit 8 also opens the dust remover 5 and the vent valve 3-1 of the dust hood 3 on the road, which indicates that the dust concentration is higher at the moment and dust removal work is required. When the dust concentration is higher, the control unit 8 also controls the width adjusting device 3-2 of the dust hood 3 to further increase the length-width ratio and increase the negative pressure value of the dust hood 3. The first threshold value and the second threshold value of the dust concentration detector 7 may be manually set.

A variable frequency fan and a frequency converter are adopted in the dust remover 5, a negative pressure value range is set, when the negative pressure value is lower than a set value, the rotating speed of the motor is increased, the air exhaust amount is increased, and when the negative pressure value is higher than the set value, the rotating speed of the motor is reduced, and the air exhaust amount is reduced.

Claims

1. The utility model provides a concrete mixing plant negative pressure gas curtain dust pelletizing system, includes a set of aggregate storehouse (1) and aggregate storehouse and ground storehouse (2) that are used for concrete batching that are used for saving concrete raw materials, its characterized in that: aggregate storehouse (1) is door storehouse formula structure, all is provided with dust hood (3) that the opening is the rectangular formula on the door roof beam of aggregate storehouse (1) and the pan feeding mouth top in ground storehouse (2), and dust hood (3) are connected with dust remover (5) with the help of pipeline (4), the air intake aspect ratio of dust hood (3) be (20-40): 1.

2. the negative pressure air curtain dust removal system for the concrete mixing plant according to claim 1, which is characterized in that: the dust hood (3) is internally provided with a normally closed vent valve (3-1), and the controlled end of the vent valve (3-1) is connected with a control unit (8) of the dust remover (5).

3. The negative pressure air curtain dust removal system for the concrete mixing plant according to claim 2, wherein: the vent valve (3-1) is an electromagnetic valve or a normally closed pneumatic valve.

4. The negative pressure air curtain dust removal system for the concrete mixing plant according to claim 1, wherein: the dust remover (5) adopts an industrial pulse dust remover, and a variable frequency fan and a frequency converter are adopted in the dust remover (5).

5. The negative pressure air curtain dust removal system for the concrete mixing plant according to claim 1 or 2, wherein: install inductive switch (6) on suction hood (3) in aggregate storehouse (1), the signal output part of inductive switch (6) connects control unit (8), and dust remover (5) is connected in control unit (8).

6. The negative pressure air curtain dust removal system for the concrete mixing plant according to claim 1 or 2, characterized in that: dust concentration monitors (7) are arranged on the dust hoods (3) of the aggregate bin (1) and the ground bin (2), the signal output ends of the dust concentration monitors (7) are connected with a control unit (8), and the control unit (8) is connected with a dust remover (5).

7. The negative pressure air curtain dust removal system for the concrete mixing plant according to claim 1, which is characterized in that: the air inlet of the dust hood (3) is provided with a width adjusting device.