CN117022969B - Sand and stone finished product bin feeding device and control method - Google Patents

Abstract

The present invention relates to the field of concrete production technology, and specifically to a feeding device and control method for a finished sand and gravel silo. Finished sand and gravel materials are cached in different cache silos according to their specifications. By controlling the discharge, the materials of different specifications are discharged in different time periods and sections, and then transported to the raw material storage area through a bucket elevator and a belt conveyor C. In the raw material storage area, the finished product silo and the cache silo are controlled to correspond one to one, so that the materials of different specifications are fed to the corresponding finished product silo in different time periods and sections. The feeding device of the present invention has a compact structure, reduces the land occupation and equipment costs, and realizes the control of dust and noise through reasonable equipment layout, which is helpful for environmental protection. In addition, through reasonable process control, the cache silo is discharged in different time periods and sections, and the finished product silo is fed in different time periods and sections, so that the belt conveyor C can be shared, which ensures material transportation, reduces equipment investment through process control, and effectively reduces the production cost of the enterprise.

Description

A feeding device and control method for finished sand and gravel material bin

Technical Field

The invention relates to the technical field of concrete production, and in particular to a feeding device and a control method for a finished sand and gravel bin.

Background Art

Sand and gravel are needed in the process of concrete production. According to actual needs, sand and gravel of different specifications are needed. In actual production, sand and gravel of various levels are prepared through crushing, screening and washing. The prepared sand and gravel will be cached in the buffer silo, and then transported to the finished product silo in the raw material storage area through a series of transfers. This is determined by the layout of the factory. The raw materials stacked in the finished product silo also bring convenience to subsequent use.

In the existing transportation of various grades of sand and gravel, usually each specification of sand and gravel corresponds to a belt conveyor. Therefore, in order to transport sand and gravel of various specifications in the process, multiple belt conveyors are required. Due to the long transportation distance, the belt conveyor has not only a very high manufacturing cost, but also high energy consumption and difficult layout and installation, which greatly increases the space occupation, installation and use costs of the equipment, and is not conducive to reducing the production cost of the enterprise.

Therefore, in the actual production and transportation process of sand and gravel, the finished material silo feeding device and control method that can effectively reduce the installation and use costs of equipment through reasonable space layout and scientific and effective process control, thereby effectively reducing the production cost of the enterprise, is an existing problem that needs to be solved.

Summary of the invention

The purpose of the present invention is to provide a feeding device and control method for a finished sand and gravel bin, so as to solve the problems of large equipment footprint and numerous equipment arrangements during the transportation process of the raw material storage area of the existing finished sand and gravel bin, which results in high plant land costs and high equipment use, installation and maintenance costs.

To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a sand and gravel finished product silo feeding device, including a buffer silo, which is set in the raw material production area and arranged in multiple, each buffer silo discharges materials in time and sections, and a bucket elevator is arranged below the buffer silo, and the discharge end of the bucket elevator cooperates with a belt conveyor C. There is only one belt conveyor C, and the belt conveyor C goes to the raw material stacking area. Multiple finished product silos are arranged in the raw material stacking area, and the finished product silos correspond to the buffer silos one by one. A plough-type unloader is installed on the belt conveyor C, and the belt conveyor C feeds materials to each finished product silo in time and sections through the plough-type unloader.

Furthermore, the discharge port of the cache silo is arranged in a pit, and a belt conveyor A is arranged and installed below the discharge port. One or more belt conveyors A are arranged, and each belt conveyor A corresponds to one or more cache silos. The discharge end of belt conveyor A feeds belt conveyor B, and the discharge end of belt conveyor B feeds the feed end of the bucket elevator.

Furthermore, a weight-type material level meter is installed above the buffer silo, and an electro-hydraulic sector-shaped unloading gate is arranged and installed at the discharge port of the buffer silo.

Furthermore, the belt conveyor C is arranged above the finished product silo through a steel structure support, and a belt conveyor D is arranged below the plough type discharger, and the belt conveyor D feeds the corresponding finished product silo.

Furthermore, the tail discharge end of the belt conveyor C directly cooperates with the belt conveyor D.

A method for controlling the feeding of a finished sand and gravel silo, characterized in that it comprises the following steps:

S1. Connect the weight-type material level meter, electro-hydraulic fan-shaped discharge gate, belt conveyor A, belt conveyor B, bucket elevator, belt conveyor C, plough-type discharger and belt conveyor D to the PLC control system respectively;

S2. Open the electro-hydraulic sector discharge gate at the corresponding buffer silo discharge port according to the material level signal detected by the weight-hammer material level meter, and start the belt conveyor A corresponding to the discharge port to transport the material to the belt conveyor B;

S3, belt conveyor B, bucket elevator and belt conveyor C are kept open to transport materials to the raw material storage area;

S4, the plough discharger above the finished product silo corresponding to the specifications of the buffer silo in S2 is actuated, and the corresponding belt conveyor D is started to transport the materials to the corresponding finished product silo;

S5, the weight-type material level meter detects that the material in the buffer silo in S2 is lower than the set value, and the corresponding electro-hydraulic sector discharge gate is closed. After a certain delay, the belt conveyor A is closed;

S6. Open the electro-hydraulic sector discharge gate at the corresponding buffer silo discharge port according to the material level signal detected by the weight hammer type material level meter, start the belt conveyor A corresponding to the discharge port, and transport the material to the belt conveyor B;

S7, repeat step S3, after the same delay time as in S5, the plough discharger and the belt conveyor D return to their original position, the belt conveyor D is closed, and then the plough discharger above the finished product silo corresponding to the specifications of the buffer silo in S6 is actuated, and the corresponding belt conveyor D is started to transport the materials to the corresponding finished product silo;

S8. Repeat steps S5-S7 to realize the feeding cycle.

Furthermore, in S2 and S6, the electro-hydraulic sector-shaped discharge gate at the discharge port of the buffer silo with the largest amount of material is opened preferentially.

Further, in the above S5-S6, if the subsequent buffer bin and the previous buffer bin share a belt conveyor A, the belt conveyor A is not shut down, otherwise the belt conveyor A is shut down.

Furthermore, in the above-mentioned S5 and S7, the delay time needs to be reasonably adjusted according to the actual operating conditions to ensure that there is no residual material on the belt conveyor A and that the boundaries between materials of different specifications are clear in subsequent transportation.

Furthermore, in the above-mentioned S4 and S7, if the material is transported to the finished product bin at the tail discharge end of the belt conveyor C, only the corresponding belt conveyor D is started.

Beneficial effects of the present invention:

1. Through the time-sharing and segmented output of materials of different levels in the buffer silo, and then the corresponding time-sharing and segmented input of materials of different levels in the raw material stacking area, the operation efficiency of each equipment is improved, the idle rate of equipment is reduced, and the purchase, installation, use and maintenance costs of equipment are effectively reduced, which plays a positive role in improving production efficiency and reducing production costs;

2. The discharge port of the buffer silo is located below the ground, which can effectively prevent dust and reduce noise, which is of great significance to environmental protection.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the main view of the material transfer in the buffer silo of the raw material production area of the present invention;

FIG2 is a schematic top view of material transfer in a buffer silo in a raw material production area of the present invention;

3 is a schematic diagram of the main view of the raw material storage area feeding the finished product silo of the present invention;

4 is a schematic front view of the plow-type discharger on the belt conveyor C of the present invention;

FIG. 5 is a schematic diagram of the feeding process of the finished product silo in the raw material storage area according to the present invention.

The names corresponding to the marks in the figure are:

1. Hardened ground; 2. Pit; 3. Lifting chute; 4. Buffer silo; 41. Feed inlet; 42. Discharge outlet; 43. Weight-type material level meter; 44. Electro-hydraulic fan-shaped discharge gate; 5. Belt conveyor A; 6. Belt conveyor B; 7. Bucket elevator; 8. Belt conveyor C; 81. Plough-type discharger; 9. Belt conveyor D; 10. Finished product silo; 101. Steel structure support.

DETAILED DESCRIPTION

The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

As shown in Figures 1-5, a pit 2 is constructed in the raw material production area, a hardened ground 1 of reinforced concrete is laid on the pit 2, and a buffer silo 4 is arranged and installed on the ground 1, wherein there are six buffer silos 4, each for storing sand and gravel of different specifications.

A feed port 41 is provided on the buffer silo 4 , a discharge port 42 is provided below the buffer silo 4 , the discharge port 42 extends downward into the pit 2 , a weight-type material level meter 43 is installed on the buffer silo 4 , and an electro-hydraulic fan-shaped unloading gate 44 is installed at the discharge port 42 .

A belt conveyor A5 is arranged below the discharge port 42 of the buffer silo 4. There are two belt conveyors A5 and they are arranged symmetrically according to the position of the buffer silo 4. A belt conveyor B6 is arranged below the intersection of the two belt conveyors A5, and a lifting trough 3 is arranged below the output end of the belt conveyor B6. A bucket elevator 7 is installed at the lifting trough 3, and a belt conveyor C8 is installed at the discharge of the bucket elevator 7.

The belt conveyor C8 leads to the raw material stacking area, where a finished product silo 10 is provided. A steel structure support 101 is arranged on the finished product silo 10. The belt conveyor C8 is supported and fixed by the steel structure support 101. A plough type discharger 81 is arranged and installed on the belt conveyor C8. A belt conveyor D9 is arranged below the plough type discharger 81. The belt conveyor D9 transports materials of various specifications to the corresponding finished product silo 10.

The principle of the present invention is:

The finished sand and gravel products from the crushing, screening and washing sections are classified and stored in the buffer silo 4. During the process, multiple buffer silos 4 are provided, which can be used to classify and store sand and gravel of different specifications. The buffered sand and gravel are then transported to the finished product silo 10 for stacking through a series of transfers.

During the process, the weight-type level meter 43 can measure the amount of material in each buffer silo 4, and transmit the measurement result to the PLC control system. The PLC control system opens the electro-hydraulic fan-shaped unloading gate 44 at the bottom of the buffer silo 4 according to the amount of material in each buffer silo 4. During the process, the electro-hydraulic fan-shaped unloading gate 44 at the bottom of the buffer silo 4 with the largest amount of material is opened first, so that the material in the corresponding buffer silo 4 will fall onto the belt conveyor A5. At this time, the material in the buffer silo 4 will continue to decrease, and the weight-type level meter 43 will measure the amount of material at regular intervals during the whole process. When the amount of material is lower than the set value, the electro-hydraulic fan-shaped unloading gate 44 is closed, the buffer silo 4 stops unloading, and then switches to another specification of buffer silo 4 for discharging.

When switching between sand and gravel of different specifications, the electro-hydraulic fan-shaped unloading gate 44 at the bottom of the rear buffer silo 4 will be delayed for a certain period of time before opening. In actual production, the delay is 30 to 60 seconds. On the one hand, this is to make clear distinctions between sand and gravel of different grades, and on the other hand, it also avoids long-term idling of the equipment and effectively controls energy consumption.

The sand and gravel coming out of the buffer silo 4 is transported to the belt conveyor B6 through the belt conveyor A5, and then transported to the bucket elevator 7, lifted by the bucket elevator 7, and then transported to the raw material storage area through the belt conveyor C8. The reasonable layout of the factory building during the process reduces the land occupation cost of the factory building on the one hand, and controls dust and noise on the other hand, which is helpful for environmental protection. Through this time-sharing and segmented transportation mode, the belt conveyor C8 is shared, and different levels of materials can be transported by one belt conveyor C8, which effectively reduces the equipment and its use and maintenance costs.

By arranging and installing a plow type discharger 81 on the belt conveyor C8, the time-sharing and segmented output of the finished raw materials can be achieved. During the process, the plow type discharger 81 corresponds to the buffer bin 4. For example, when the buffer bin A is started, the plow type discharger 81 above the finished product bin A is actuated and cuts off the materials on the belt conveyor C8, so that all the materials discharged from the buffer bin 4 can be transported to the finished product bin A. By analogy, the classified storage of materials of different levels can be achieved. It should be noted that during the process, there is no need to set a plow type discharger 81 at the tail of the belt conveyor C8, that is, the number of plow type dischargers 81 is one less than the number of finished product bins 10. At the same time, in the process of switching between raw materials of various levels, a small amount of admixture of sand and gravel of different levels will inevitably be produced. However, for hundreds or thousands of tons of sand and gravel raw materials, this small amount of admixture is negligible and will not cause any impact on the production of concrete.

In the above process, the weight hammer level meter 43 is an intermittent measurement level meter, the electro-hydraulic fan-shaped discharge gate 44 is an electric hydraulic gate, the bucket elevator 7, the plow type discharger 81 and various belt conveyors are widely used in the field of concrete production. They are existing mature technologies and are not difficult to understand for those skilled in the art. Their structure, principle and usage will not be repeated here. At the same time, the above-mentioned PLC control system is a simple PLC control, which is an existing mature technology and is not difficult to understand for those skilled in the art, so it will not be repeated.

The present invention has obvious environmental protection and economic benefits. The structural design of the pit 2 is adopted in the process. On the one hand, it can effectively reduce the dust when the sand and gravel are discharged, which is beneficial to the protection of the environment. At the same time, the noise in the production process is also controlled to a certain extent. In addition, the buffer silo 4 feeds the finished product silo, and only one main belt conveyor C8 is needed in the process. Therefore, the process can not only greatly reduce the equipment cost, but also effectively reduce the energy consumption. Compared with the existing arrangement, the energy consumption is reduced by about 500~1000kw, and the energy consumption is reduced by about half, which plays a positive role in reducing the production cost.

The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims (4)

1. A method for controlling the feeding of a finished sand and gravel product silo, characterized in that it comprises the following steps: S1. Arrange a plurality of buffer silos (4) in the raw material production area, and arrange a plurality of finished product silos (10) in the raw material storage area, wherein the finished product silos (10) correspond one to one to the buffer silos (4); A weight-type material level meter (43) is installed above the buffer silo (4), and an electro-hydraulic sector-shaped discharge gate (44) is installed at the discharge port (42) of the buffer silo (4); The discharge port (42) of the buffer silo (4) is arranged in the pit (2), and a belt conveyor A (5) is arranged and installed below the discharge port (42). One or more belt conveyors A (5) are arranged, and each belt conveyor A (5) corresponds to one or more buffer silos (4). The discharge end of the belt conveyor A (5) feeds the belt conveyor B (6), and the discharge end of the belt conveyor B (6) feeds the feed end of the bucket elevator (7). The discharge end of the bucket elevator (7) cooperates with the belt conveyor C (8). There is only one belt conveyor C (8), and the belt conveyor C (8) goes to the raw material storage area. A plough discharger (81) is installed on the belt conveyor C (8), and a belt conveyor D (9) is arranged below the plough discharger (81). The belt conveyor D (9) feeds the corresponding finished product bin (10), and the tail discharge end of the belt conveyor C (8) directly cooperates with the belt conveyor D (9); The weight-type material level meter (43), the electro-hydraulic fan-shaped discharge gate (44), the belt conveyor A (5), the belt conveyor B (6), the bucket elevator (7), the belt conveyor C (8), the plough-type discharger (81) and the belt conveyor D (9) are respectively connected to the PLC control system; S2, opening the electro-hydraulic sector-shaped discharge gate (44) at the discharge port (42) of the corresponding buffer silo (4) according to the material level signal detected by the weight-hammer type material level meter (43), starting the belt conveyor A (5) corresponding to the discharge port (42), and conveying the material to the belt conveyor B (6); Prioritizing the opening of the electro-hydraulic sector-shaped discharge gate (44) at the discharge port (42) of the buffer silo (4) with the largest amount of material; S3, belt conveyor B (6), bucket elevator (7) and belt conveyor C (8) are kept open to transport materials to the raw material storage area; S4, the plough discharger (81) above the finished product bin (10) corresponding to the specifications of the buffer bin (4) in S2 is actuated, and the corresponding belt conveyor D (9) is started to transport the materials to the corresponding finished product bin (10); S5, the weight-type material level meter (43) detects that the material in the buffer silo (4) in S2 is lower than the set value, and the corresponding electro-hydraulic sector discharge gate (44) is closed, and after a certain delay, the belt conveyor A (5) is closed; S6. Open the electro-hydraulic sector discharge gate (44) at the discharge port (42) of the corresponding buffer silo (4) according to the material level signal detected by the weight-type material level meter (43), and start the belt conveyor A (5) corresponding to the discharge port (42) to transport the material to the belt conveyor B (6); Prioritizing the opening of the electro-hydraulic sector-shaped discharge gate (44) at the discharge port (42) of the buffer silo (4) with the largest amount of material; S7, repeating step S3, after the same delay time as in S5, the plough discharger (81) and the belt conveyor D (9) return to their original positions, the belt conveyor D (9) is turned off, and then the plough discharger (81) above the finished product bin (10) corresponding to the specifications of the buffer bin (4) in S6 is actuated, and at the same time, the corresponding belt conveyor D (9) is started to transport the materials to the corresponding finished product bin (10); S8. Repeat steps S5-S7 to realize the feeding cycle. 2. A method for controlling the feeding of finished sand and gravel silos according to claim 1, characterized in that: in the above S5-S6, if the subsequent buffer silo (4) and the previous buffer silo (4) share a belt conveyor A (5), the belt conveyor A (5) is not turned off, otherwise the belt conveyor A (5) is turned off. 3. A method for controlling the feeding of finished sand and gravel silos according to claim 1, characterized in that: in said S5 and S7, the delay time needs to be reasonably adjusted according to the actual operation conditions to ensure that there is no residual material on the belt conveyor A (5) and that the boundaries between materials of different specifications are clear in subsequent transportation. 4. A method for controlling the feeding of a finished sand and gravel silo according to claim 1, characterized in that: in the above S4 and S7, if the material is transported to the finished product silo (10) at the tail discharge end of the belt conveyor C (8), only the corresponding belt conveyor D (9) is started.