CN113561336A

CN113561336A - Intermittent type formula cement concrete mixing plant

Info

Publication number: CN113561336A
Application number: CN202111007082.9A
Authority: CN
Inventors: 张裕豪
Original assignee: Ziyang Guangwei Intelligent Equipment Co ltd
Current assignee: Ziyang Guangwei Intelligent Equipment Co ltd
Priority date: 2021-08-30
Filing date: 2021-08-30
Publication date: 2021-10-29

Abstract

The invention discloses an intermittent cement concrete mixing plant which comprises an aggregate feeding device, a powder feeding device, a premixing device, a transfer device and a mixing and stirring device, wherein the discharge end of the aggregate feeding device and the discharge end of the powder feeding device are both connected with the feed end of the premixing device, and the discharge end of the premixing device is connected with the mixing and stirring device through the transfer device. According to the invention, as the aggregate and the powder are uniformly pre-stirred for one time by the pre-mixing device, the mixing uniformity of the aggregate and the powder is improved, the aggregate and the powder can be effectively prevented from being seriously separated in subsequent treatment, the workability of cement concrete is enhanced, the stirring time of the stirring and mixing device for the aggregate and the powder is shortened, and the working efficiency of the stirring station is improved.

Description

Intermittent type formula cement concrete mixing plant

Technical Field

The invention relates to the technical field of construction equipment, in particular to an intermittent cement concrete mixing plant.

Background

The concrete is called concrete (t xi ng) for short, which is a general name of engineering composite materials formed by cementing aggregate into a whole by cementing materials. The term concrete generally refers to cement as a cementing material and sand and stone as aggregate; the cement concrete is also called as common concrete and is obtained by mixing the cement concrete and water (which can contain additives and admixture) according to a certain proportion and stirring. Because the concrete has the characteristics of rich raw materials, low price and simple production process, the consumption of the concrete is increased more and more. Meanwhile, the concrete also has the characteristics of high compressive strength, good durability, wide strength grade range and the like, and the characteristics ensure that the application range of the concrete is very wide.

In the civil engineering works of the prior art, the mixing of the concrete is usually carried out at a special mixing station. However, when the existing concrete mixing plant is used for mixing, the aggregate and the powder are firstly put into the mixing main machine together, and then water (admixture) is added for mixing, and the existing concrete mixing plant has the following defects: 1. poor stirring uniformity, which causes the problems of insufficient strength of cement concrete and mortar balls; 2. the stirring time is long, and the stirring efficiency is low.

Disclosure of Invention

The invention aims to provide an intermittent cement concrete mixing plant, which solves the problems of insufficient cement concrete strength and mortar balls (axle seizure) caused by poor mixing uniformity of the mixing plant in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides an intermittent type formula cement concrete mixing plant, includes aggregate feedway, powder feedway, premixing device, transfer device and stirring mixing arrangement, aggregate feedway's discharge end and powder feedway's discharge end all with premixing device's feed end is connected, premixing device's discharge end passes through transfer device is connected with the stirring mixing arrangement.

As an alternative scheme of the invention, the powder feeding device comprises a powder storage bin and a fine sand storage bin, the bottoms of the powder storage bin and the fine sand storage bin are respectively provided with a powder decrement measuring hopper and a fine sand decrement measuring hopper, the powder decrement measuring hopper and the fine sand decrement measuring hopper are connected with a first conveying device, and the discharge end of the first conveying device is connected with the feed end of the premixing device.

As an alternative of the invention, the first conveyor is a conveyor screw.

As an alternative of the invention, the aggregate feeding device comprises a plurality of aggregate storage bins, the aggregate storage bins are provided with aggregate decrement weighing hoppers, the aggregate decrement weighing hoppers are connected with the second conveying device, and the discharge ends of the second conveying device are connected with the feed ends of the premixing devices.

As an alternative scheme of the invention, the aggregate weight reduction measuring hopper is provided with a belt feeder, the belt feeder is connected with a controller, the aggregate storage bin and the aggregate weight reduction measuring hopper are both provided with a control valve and a weighing sensor, and the control valve and the weighing sensor are both connected with the controller.

As an alternative of the invention, the aggregate storage bins comprise a sand storage bin and a plurality of stone storage bins, the aggregate reduction weighing hoppers comprise a sand reduction weighing hopper and a stone reduction weighing hopper, the sand reduction weighing hopper is arranged at the bottom of the sand storage bin, the stone reduction weighing hopper is arranged at the bottom of the stone storage bin, and the sand reduction weighing hopper and the stone reduction weighing hopper are connected with the feed end of the premixing device through the second conveying device.

As an alternative of the invention, the second conveyor is a belt conveyor.

As an alternative scheme of the invention, the stirring and mixing device comprises a stirring machine body, the stirring machine body is connected with a water metering hopper, an additive metering hopper, a middle storage hopper and a finished product bin, and the middle storage hopper is connected with a transfer device.

As an alternative of the invention, the transfer device is a hoist.

As an alternative of the invention, the premixing device is a premixer.

The invention has the beneficial effects that:

1. according to the invention, as the aggregate and the powder are uniformly pre-stirred for one time through the pre-mixing device, the mixing uniformity of the aggregate and the powder is improved, the aggregate and the powder can be effectively prevented from being seriously separated in subsequent treatment, the workability of cement concrete is enhanced, the stirring time of the stirring and mixing device for the aggregate and the powder is shortened, the working efficiency of the stirring station is improved, and the problems of insufficient strength of the cement concrete and the occurrence of mortar balls (axle seizing) caused by poor stirring uniformity of the stirring station in the prior art are effectively solved.

2. According to the invention, the aggregate and the powder are mixed and then are lifted by the lifter to enter the stirring and mixing device for stirring, the overall height of the stirring station is about 15 m, the overall height of the stirring station is greatly reduced, and the equipment investment and the environmental protection investment cost are reduced.

3. According to the invention, before each stirring, the sand, the pebble, the fine powder and the fine sand in a batching period are calculated, and the quantitative supply of the sand, the pebble, the fine powder and the fine sand is realized through the sand decrement measuring hopper, the pebble decrement measuring hopper, the powder decrement measuring hopper and the fine sand decrement measuring hopper, so that the accuracy of the supply of the sand, the pebble, the fine powder and the fine sand can be greatly improved, the design requirement of the stirred cement concrete can be met, and meanwhile, a certain raw material cost can be saved.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a bone material supplying device according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a powder feeder according to an embodiment of the present invention;

fig. 4 is a schematic structural view of an agitating and mixing apparatus according to an embodiment of the present invention.

In the figure: 1-an aggregate feeding device; 11-a sand storage bin; 12-a stone storage bin; 13-a sand reduction measuring hopper; 14-stone decrement measuring hopper; 15-a belt conveyor; 2-powder feeding device; 21-powder storage bin; 22-fine sand storage; 23-powder decrement weighing hopper; 24-a fine sand reduction weighing hopper; 25-a conveying screw; 3-a premixing device; 4-a transfer device; 5-stirring and mixing device; 51-mixing body; 52-a water measuring hopper; 53-admixture measuring hopper; 54-middle storage bucket; 55-finished product warehouse.

Detailed Description

Examples

As shown in fig. 1-4, the present embodiment provides an intermittent cement concrete mixing plant, which includes, but is not limited to, an aggregate feeding device 1, a powder feeding device 2, a pre-mixing device 3, a transferring device 4, and a mixing device 5, wherein a discharge end of the aggregate feeding device 1 and a discharge end of the powder feeding device 2 are both connected to a feed end of the pre-mixing device 3, and a discharge end of the pre-mixing device 3 is connected to the mixing device 5 through the transferring device 4. The aggregate feeding device 1 is used for providing aggregate for producing cement concrete for the mixing plant, and the powder feeding device 2 is used for providing powder for producing cement concrete for the mixing plant.

The premixing device 3 is a premixer, aggregate provided by the aggregate feeding device 1 and powder provided by the powder feeding device 2 are conveyed into the premixing device 3 together after being proportioned and measured, the premixing device 3 conducts premixing treatment on the aggregate and the powder, the aggregate and the powder after the premixing are transferred into the stirring and mixing device 5 through the transfer device 4, and cement concrete is obtained through stirring and mixing treatment of the stirring and mixing device 5. According to the invention, as the aggregate and the powder are uniformly pre-stirred for one time through the pre-mixing device 3, the mixing uniformity of the aggregate and the powder is improved, the aggregate and the powder can be effectively prevented from being seriously separated in subsequent treatment, the workability of cement concrete is enhanced, the stirring time of the stirring and mixing device 5 for the aggregate and the powder is shortened, the working efficiency of the stirring station is improved, and the problems of insufficient strength of the cement concrete and mortar balls caused by poor stirring uniformity of the stirring station in the prior art are effectively solved.

Specifically, aggregate feedway 1 includes that a plurality of aggregates store the storehouse, the storehouse is stored to the aggregate is equipped with aggregate decrement weighing hopper, aggregate decrement weighing hopper is connected with second conveyor, second conveyor's discharge end with pre-mixing unit 3's feed end is connected. The second conveying device is provided below each aggregate reduction weighing hopper, and conveys the aggregates output from each aggregate reduction weighing hopper to the premixing device 3.

In the prior art, due to the fact that a fall exists between the storage hopper and the addition metering hopper, the blanking is discontinuous, the situation of more blanking or less blanking can be caused, and in addition, a large amount of material is fed instantly when the material is fed after the addition metering hopper is metered, so that the material scattering can be caused. According to the invention, the bottom of each aggregate storage bin is provided with the aggregate reduction weighing hopper, the discharge amount is controlled through subtraction metering, and the blanking precision is greatly improved.

As shown in fig. 2, specifically, the aggregate storage bins include a sand storage bin 11 and a plurality of stone storage bins 12, the number of the sand storage bin 11 and the number of the stone storage bins 12 are set according to actual requirements, in this embodiment, the sand storage bin 11 has one, the stone storage bins 12 has four, and the four stone storage bins 12 have stones with different grain sizes. The aggregate reduction measuring hoppers comprise a sand reduction measuring hopper 13 and a stone reduction measuring hopper 14, the sand reduction measuring hopper 13 is arranged at the bottom of the sand storage bin 11, the stone reduction measuring hopper 14 is arranged at the bottom of the stone storage bin 12, and the sand reduction measuring hopper 13 and the stone reduction measuring hopper 14 are connected with the feeding end of the premixing device 3 through the second conveying device. The sand decrement measuring hopper 13 and the pebble decrement measuring hopper 14 both adopt decrement measurement mode for feeding, and the aggregate proportioning precision can be improved, so that the quality of cement concrete is higher.

Aggregate decrement weighing hopper sets band conveyer, band conveyer is connected with the controller, storehouse and aggregate decrement weighing hopper are all equipped with control valve and weighing sensor to aggregate storage, control valve and weighing sensor all with the controller is connected. The control valve is controlled by an air cylinder, different aggregates are added into the sand storage bin 11 and the stone storage bin 12 in advance during operation, when the sand and the stones need to be added, the air cylinders of the sand storage bin 11 and the stone storage bin 12 are controlled to be opened by the controller, the sand and the stones fall into the sand reduction measuring hopper 13 and the stone reduction measuring hopper 14 respectively, based on the preset aggregate proportion of the cement concrete, the controller controls the rotating speed of a speed reduction motor of the belt conveyor according to a detection value of the weighing sensor, so that the belt conveyors of the sand reduction measuring hopper 13 and the stone reduction measuring hopper 14 output quantitative sand and stones, and then the belt conveyors 15 convey the quantitative sand and stones to the premixing device 3 for premixing treatment. The invention adopts the subtraction metering to control the proportion of the sand and the pebbles, thereby reducing the error caused by feeding and improving the quality of the cement concrete.

In the specific implementation process, the stones are also called coarse aggregate, the common stones comprise broken stones and pebbles, the broken stones are natural rocks or rock particles which are prepared by mechanically crushing and screening the rocks and have the particle size of more than 4.75. mm; pebbles are rock particles with a particle size of more than 4.75.mm, which are formed by natural weathering, water flow transportation, sorting and stacking. The sand is also called fine aggregate and is divided into natural sand and artificial sand according to production sources; the natural sand is rock particles which are formed by natural weathering, water flow transportation, sorting and accumulation and have the particle size of less than 4.75.mm, but does not comprise particles of soft rock and weathered rock; natural sands include river sands, lake sands, mountain sands, and desalinated sea sands. The artificial sand is a general name of machine-made sand and mixed sand which are subjected to soil removal treatment. Although the sand has a slightly smaller particle size, it is also granular. Since the stones and the sands are both granular materials, there are many second conveying devices capable of conveying the stones and the sands to the premixing device 3, and in a further embodiment, the second conveying device in the embodiment of the present invention specifically adopts the belt conveyor 15, and the belt conveyor 15 has the advantages of strong conveying capacity, long conveying distance, simple structure, easy maintenance, and convenience in performing programmed control and automatic operation. The belt conveyor 15 conveys the granular articles below 100KG by using the continuous or intermittent motion of the conveying belt, has high and stable running speed and low noise, can convey the articles up and down slopes, and can greatly meet the requirements of conveying stones and sands.

As shown in fig. 3, in the present embodiment, the powder supply device 2 includes a powder storage bin 21 and a fine sand storage bin 22, a powder amount reducing hopper 23 and a fine sand amount reducing hopper 24 are respectively disposed at bottoms of the powder storage bin 21 and the fine sand storage bin 22, the powder amount reducing hopper 23 and the fine sand amount reducing hopper 24 are connected to a first conveying device, and a discharge end of the first conveying device is connected to a feed end of the premixing device 3. The powder storage bin 21 and the fine sand storage bin 22 are used for storing fine powder and fine sand respectively, the powder decrement measuring hopper 23 and the fine sand decrement measuring hopper 24 are used for controlling the proportion of the fine powder and the fine sand by adopting subtraction metering, and the fine powder and the fine sand are conveyed to the premixing device 3 through the first conveying device to be premixed with aggregate. Preferably, the first conveyor is a conveyor screw 25.

The aggregates (sand and gravel) mainly play a rigid supporting role in the cement concrete, and the powder (fine powder and fine sand) is mainly used for filling gaps among the aggregates, so that the aggregates can be bonded together, and the sufficient strength is achieved. Because the fine powder and the fine sand can fill gaps in the aggregate, but the fine powder mainly plays a role in bonding, if the fine powder and the fine sand are not uniformly mixed, the final cement concrete has insufficient local strength, and the quality of the concrete is influenced. The mixing station provided by the invention is provided with the conveying screw 25, fine powder and fine sand are mixed in advance, and then the fine powder and aggregate are further mixed in the premixing device 3, so that the mixing time can be saved, the aggregate and the powder can be mixed more uniformly, and the quality of cement concrete is ensured.

The fine powder in the cement concrete mainly comprises cement and fly ash, and the cement and fly ash have small particle sizes and light weight, so that dust can be raised when the cement and fly ash are blown by wind slightly, the environment is polluted, and raw materials are wasted. In addition, the whole construction height of the existing cement concrete mixing plant is higher, and the construction and maintenance cost is increased. In this embodiment, aggregate and powder batching back promote through the lifting machine and get into stirring mixing arrangement 5 in the stirring, the height of the whole construction of stirring station is about 15 meters, and the whole height of stirring station has obtained very big reduction, has reduced equipment investment and environmental protection investment cost.

As shown in fig. 4, in the present embodiment, the stirring and mixing device 5 includes a mixer body 51, the mixer body 51 is connected with a water measuring hopper 52, an admixture measuring hopper 53, a middle storage hopper 54 and a finished product bin 55, and the middle storage hopper 54 is connected with the transfer device 4. Well hopper 54 sets up in the top of mixer body 51, and well hopper 54 is used for keeping in the powder and the aggregate of mixing, and finished product storehouse 55 sets up in the below of mixer body 51, and finished product storehouse 55 keeps in the cement concrete that the mixture was accomplished. The water metering hopper 52 and the admixture metering hopper 53 are respectively used for adding water and admixture, are convenient to use, and can enable the admixture to be fully mixed with water, so that the admixture is fully mixed with aggregate and powder in the mixer body 51, and the quality of cement concrete is ensured.

The working process of the mixing station provided by the embodiment of the invention comprises the following steps:

during the first stirring, corresponding sand, pebble, fine powder and fine sand are obtained from the sand storage bin 11, the pebble storage bin 12, the powder storage bin 21 and the fine sand storage bin 22 according to the proportion, then the sand, the pebble, the fine powder and the fine sand are conveyed to the premixing device 3 for premixing, after the premixing is finished, the sand, the pebble, the fine powder and the fine sand are conveyed to the middle storage hopper 54 through the hoisting machine, and then the materials in the middle storage hopper 54 are added into the mixing machine body 51; then, a proper amount of water (if an additive is needed, a proper amount of additive is added according to the mixture ratio) is added into the mixer body 51 according to the mixture ratio, mortar stirring and mixing are carried out, and after the stirring and mixing are finished, finished concrete is obtained and temporarily stored in a finished product bin 55.

During the stirring process of the finished concrete product, sand, stones, fine powder and fine sand in the next stirring period are premixed, then conveyed to the middle storage hopper 54 for temporary storage, after the finished concrete product in the period is stirred and conveyed to the finished product bin 55, the materials in the middle storage hopper 54 are added into the mixer body 51, water is added at the same time, and additives can be added for mortar stirring and mixing if necessary; then, sand, stones, fine powder and fine sand in the next period are premixed and conveyed to the middle storage hopper 54 for temporary storage, and the operation is repeated in this way, so that the working efficiency is improved.

In the prior art, the sand storage bin 11, the pebble storage bin 12, the powder storage bin 21 and the fine sand storage bin 22 are all provided with metering devices, but the metering devices usually obtain the discharge amount by calculating the allowance, and the feeding is not continuous feeding because the stirring and mixing device 5 is a batch stirrer, and when the stirring amount at one time is enough, the feeding is stopped suddenly. When the sudden stop, because some other reasons, for example inertia effect, can lead to partial raw and other materials excess, especially aggregate for actual ratio can't match with the design ratio, not only leads to the cement concrete intensity easily can't satisfy the design demand, still has the condition of extravagant raw and other materials. Therefore, in order to improve the accuracy of raw material supply and enable the stirred concrete to meet the design requirement, the invention designs the sand reduction measuring hopper 13, the stone reduction measuring hopper 14, the powder reduction measuring hopper 23 and the fine sand reduction measuring hopper 24, sand, stones, fine powder and fine sand in a batching period are calculated before each stirring, and the sand reduction measuring hopper 13, the stone reduction measuring hopper 14, the powder reduction measuring hopper 23 and the fine sand reduction measuring hopper 24 are used for realizing the quantitative supply of the sand, the stones, the fine powder and the fine sand, so that the accuracy of the supply of the sand, the stones, the fine powder and the fine sand can be greatly improved, the stirred cement concrete can meet the design requirement, and meanwhile, certain raw material cost can be saved.

In the description of the present invention, the terms "mounted," "connected," "fixed," and the like are to be understood broadly and may be fixedly connected, detachably connected, or integrated; may be a mechanical or electrical connection; either directly or indirectly through intervening media, either internally or in any other relationship. Those skilled in the art will understand the specific meaning of the above terms in the present invention. Furthermore, the particular features, structures, etc. described in the examples can be included in at least one implementation and can be combined by one skilled in the art without conflicting therewith. The protection scope of the present invention is not limited to the above specific examples, and embodiments that can be imagined by those skilled in the art without creative efforts based on the basic technical concept of the present invention belong to the protection scope of the present invention.

Claims

1. The utility model provides an intermittent type formula cement concrete mixing plant, its characterized in that includes aggregate feedway (1), powder feedway (2), premixing device (3), transfer device (4) and stirring mixing arrangement (5), the discharge end of aggregate feedway (1) and the discharge end of powder feedway (2) all with the feed end of premixing device (3) is connected, the discharge end of premixing device (3) passes through transfer device (4) are connected with stirring mixing arrangement (5).

2. The batch-type cement concrete mixing plant according to claim 1, characterized in that the powder feeding device (2) comprises a powder storage bin (21) and a fine sand storage bin (22), the bottoms of the powder storage bin (21) and the fine sand storage bin (22) are respectively provided with a powder decrement measuring hopper (23) and a fine sand decrement measuring hopper (24), the powder decrement measuring hopper (23) and the fine sand decrement measuring hopper (24) are connected with a first conveying device, and the discharge end of the first conveying device is connected with the feed end of the premixing device (3).

3. A batch cement mixing plant according to claim 2, characterised in that said first conveyor is a conveyor screw (25).

4. A batch-type cement mixing plant according to claim 1, characterized in that the aggregate feeding device (1) comprises a plurality of aggregate storage bins, wherein the aggregate storage bins are provided with aggregate decrement weighing hoppers, the aggregate decrement weighing hoppers are connected with a second conveying device, and the discharge ends of the second conveying device are connected with the feed ends of the premixing devices (3).

5. The batch-type cement concrete mixing plant of claim 4, wherein the aggregate weight-reduction weighing hopper is provided with a belt feeder, the belt feeder is connected with a controller, the aggregate storage bin and the aggregate weight-reduction weighing hopper are both provided with a control valve and a weighing sensor, and the control valve and the weighing sensor are both connected with the controller.

6. A batch-type cement mixing plant according to claim 5, characterized in that the aggregate storage bins comprise a sand storage bin (11) and a plurality of gravel storage bins (12), the aggregate reduction weighing hoppers comprise a sand reduction weighing hopper (13) and a gravel reduction weighing hopper (14), the sand reduction weighing hopper (13) is arranged at the bottom of the sand storage bin (11), the gravel reduction weighing hopper (14) is arranged at the bottom of the gravel storage bin (12), and the sand reduction weighing hopper (13) and the gravel reduction weighing hopper (14) are connected with the feed end of the premixing device (3) through the second conveying device.

7. A batch cement mixing plant according to claim 4, characterised in that said second conveyor is a belt conveyor (15).

8. A batch-type cement concrete mixing plant according to claim 1, characterized in that the mixing and mixing device (5) comprises a mixer body (51), the mixer body (51) is connected with a water measuring hopper (52), an additive measuring hopper (53), a middle storage hopper (54) and a finished product bin (55), and the middle storage hopper (54) is connected with a transfer device (4).

9. A batch-type cement mixing plant according to claim 1, characterized in that said transfer device (4) is a hoist.

10. A batch plant according to claim 1, characterised in that the premixing device (3) is a premixer.