Finished product material powder content control process of small-scale sandstone processing system

Abstract

The invention belongs to the technical field of gravel processing, and relates to a process for controlling the powder content of a finished product material of a small-scale gravel processing system, an integral sealing system is formed by a material receiving sealing guide chute, a head discharge hopper and a finished product material sealing guide chute, and a vibration discharge device and a spring material receiving plate are arranged in the head discharge hopper, so that bone meal separation of aggregate is accelerated; air flow containing mountain flour in the material receiving sealing guide groove and the head discharge hopper is pumped away through the air inducing pipeline under the negative pressure effect of the variable-frequency induced draft fan, the pumped-away air flow is introduced into the transition water pool containing washing water, and the stability of the air volume and the amount of the collected mountain flour is kept; uniformly stirring a mixture of washing water and stone powder and then supplying the mixture to a sewage weighing system; and calculating the proportion of the mixture, and then supplying the mixture to a mixing plant. The process system disclosed by the invention is small in occupied area, low in input cost, capable of reducing sewage discharge, and suitable for controlling the powder content of the finished product material of a small-scale sandstone processing system.

Description

Technical Field

[0001] The present invention belongs to the technical field of sand and gravel processing, and more specifically, relates to a process for controlling the powder content of finished materials in a small-scale sand and gravel processing system. Background Art

[0002] At present, there are many small-scale material yards (production capacity ≤ 100 t / h) on the market, and most of them do not have a process for controlling the powder content. The dry powder separation process used in large and medium-sized sand and gravel processing systems has relatively high requirements for sand and gravel raw materials. A large number of dust collection devices need to be set up during the production process, and the powder separation station occupies a large area and has high costs. Therefore, the dry powder separation process is not very suitable for small-scale material yards. Some sand and gravel processing systems adopt a wet powder removal process, which controls the powder content of the product by means of water flushing. It is only applicable to mining areas with relatively rich water resources, and there is serious loss of fine sand powder. The powder content of the finished material is too low, and a large amount of drainage and sewage treatment equipment needs to be added. The process is complex, the construction investment is large, and the by-product mud cake generated during the production process is difficult to handle.

[0003] Therefore, there is an urgent need to propose a process for controlling the powder content of finished materials in a small-scale sand and gravel processing system, which has a small floor area, low input cost, and can reduce sewage discharge. Summary of the Invention

[0004] The object of the present invention is to propose a process for controlling the powder content of finished materials in a small-scale sand and gravel processing system, which has a small floor area, low input cost, and can reduce sewage discharge.

[0005] In order to achieve the above-mentioned invention object, the present invention provides a process for controlling the powder content of finished materials in a small-scale sand and gravel processing system. The small-scale sand and gravel processing system includes a receiving conveyor, a finished material conveyor, and a head discharge hopper. The top of the head discharge hopper is correspondingly arranged with the discharge end of the receiving conveyor, and the bottom of the head discharge hopper is connected to the receiving end of the finished material conveyor. The process for controlling the powder content of the finished material includes the following steps:

[0006] 1) A receiving seal guiding trough and a finished material seal guiding trough are respectively arranged on the receiving conveyor and the finished material conveyor, and the head discharge hopper is connected between the receiving seal guiding trough and the finished material seal guiding trough to form an overall sealed system;

[0007] 2) A vibrating feeding device and a spring receiving plate are arranged in the head discharge hopper to accelerate the separation of aggregate and bone powder and improve the air collection property of the upper space of the head discharge hopper;

[0008] 3) Air guiding pipes with adjustable air extraction amounts are respectively arranged on the receiving seal guiding trough and the head discharge hopper, and the air flow containing stone powder is sucked away under the negative pressure of a variable-frequency induced draft fan. The qualified aggregate then falls onto the finished material conveyor and is transported to the downstream process;

[0009] 4) Connect the air flow after extraction to a transition water tank filled with washing water, collect the stone powder in the air flow in the washing water, maintain the stability of the air volume and the amount of collected stone powder, and supply the mixture of washing water and stone powder to the sewage weighing system after stirring evenly.

[0010] 5) Calculate the ratio of the mixture in the sewage weighing system and supply it to the water used in the mixing plant to reduce the consumption of the binder in the mixing plant.

[0011] Preferably, regulating butterfly valves are provided on each air extraction pipeline to regulate the air volume and the opening and closing of the air extraction pipeline for different requirements.

[0012] Preferably, air extraction pipelines are respectively provided at the tail, middle of the material receiving and sealing guiding chute and the upper and lower parts of the head discharge hopper. The variable frequency air extraction fan is connected to each air extraction pipeline through an air extraction main pipe to achieve efficient collection of stone powder in the entire sealing system.

[0013] Preferably, the vibrating blanking device includes a vibrating motor and a bulk material plate. The top of the bulk material plate is hinged inside the bottom plate in the middle of the head discharge hopper. The vibrating motor is fixed below the bottom plate in the middle of the head discharge hopper and is fixedly connected to the bulk material plate through a vibration conduction frame. The vibration conduction frame is hermetically and slidably connected to the bottom plate in the middle of the head discharge hopper. This setting can strengthen the separation effect of the aggregate and stone powder in the head discharge hopper.

[0014] Preferably, the spring receiving plate includes a receiving plate and a spring. The receiving plate is arranged opposite to the head roller of the receiving conveyor, and the top end of the receiving plate is hinged to the head discharge hopper. The middle part of the bottom side of the receiving plate is elastically connected to the inner wall of the head discharge hopper through a spring. On the one hand, it helps to ensure the formation of negative pressure in the upper area of the head discharge hopper and ensure the suction effect of the stone powder. On the other hand, it helps to strengthen the separation of the stone powder in the aggregate.

[0015] Preferably, a stirring motor is provided at the top of the transition water tank. The output shaft of the stirring motor is drivingly connected with a stirring shaft. The stirring shaft is inserted into the washing water, and stirring blades are provided at the bottom of the stirring shaft. One end of the stirring blade far from the stirring shaft is fixedly connected to the middle of the stirring shaft through an inclined rod, which is used to realize the uniform mixing of the washing water and the stone powder, facilitate the stable transportation and reliable metering of the mixture.

[0016] Preferably, the sewage weighing system includes a bracket and a weighing hopper connected to the bracket. A feeding pipe is provided on the bracket. The feeding end of the feeding pipe is communicated with the discharge port of the transition water tank, and the discharging end of the feeding pipe corresponds to the feeding port of the weighing hopper and is arranged without contact to ensure the accuracy of weighing. A slurry pump is provided at the end of the feeding pipe close to the transition water tank to facilitate the transportation of the uniformly mixed mixture in the transition water tank into the weighing hopper for accurate metering.

[0017] The present invention also includes other devices or components that enable its normal use, all of which are conventional technical means in the art. Additionally, for the devices or components not defined in the present invention, such as stirring motors, stirring blades, vibrating motors, springs, variable-frequency induced draft fans, regulating butterfly valves, receiving conveyors, finished product conveyors, head discharge hoppers, and sealed material guiding troughs, mixing plants, and slurry pumps, etc., conventional means in the art are adopted. Those skilled in the art can select their models and installation methods according to actual usage requirements and clearly understand how to install and control them specifically, and thus will not be described in detail herein.

[0018] The working principle of the present invention is as follows: Through the overall sealing system, dust generation during transportation can be reduced and the air balance requirement of the entire sealing system can be met. By setting up induced draft pipes, the airflow containing stone powder is drawn away under negative pressure. Regulating butterfly valves are arranged on each induced draft pipe to adjust the air volume and the opening and closing of the induced draft pipes for different requirements. A spring receiving plate and a vibrating discharging device are arranged in the head discharge hopper, and the vibration source is provided by a small-power vibrating motor, so that when the aggregate is discharged from the head roller of the receiving conveyor, it is in a scattered state under the vibration effect, which is beneficial to the removal of powder from the aggregate. The setting of the spring receiving plate is beneficial to the formation of negative pressure in the sealing system. The induced draft pipes are provided with a negative pressure air source by a variable-frequency induced draft fan, so that the airflow containing stone powder falls into the transition water tank under the guidance of gravity and wind force. By arranging a stirring motor, a stirring shaft, and stirring blades in the transition water tank, the dirt content of the sewage can be kept uniform and precipitation and caking can be prevented. By adjusting the variable-frequency induced draft fan and changing the opening degree of the regulating butterfly valve, the induced air volume and the powder removal amount can be kept constant, so that the proportion of sewage in the transition water tank can also be kept dynamically constant. After calculation, it can be stably metered into the sewage weighing system and supplied to the mixing plant for use after calculation of the proportion, thereby reducing the consumption of binder in the mixing plant and achieving the purpose of cost savings.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. The small-scale sand and gravel processing system of the present invention is fully sealed throughout the process, which can reduce dust and is beneficial to environmental protection.

[0021] 2. The powder removal method of the present invention uses wind-force negative pressure dust extraction and does not completely remove stone powder, so that the powder content can be kept within the required range.

[0022] 3. The power source of the present invention is provided by a variable-frequency induced draft fan, and a regulating butterfly valve is arranged on the pipeline, which can dynamically adjust the stone powder removal amount.

[0023] 4. The stone powder removed by the present invention does not need secondary processing and transportation. It is directly connected to the transition water tank through the induced draft pipe. While maintaining the air balance of the system, it can be directly utilized on the site, which is beneficial to reducing the sewage discharge and saving water.

[0024] In summary, the process system of the present invention is simple in composition, occupies a small area, has extremely low input costs, good economy, is suitable for small-scale processing yards, can dynamically adjust the amount of stone powder removed, realizes dynamic control of the finished product quality, has few power equipment, is convenient for maintenance and repair. In addition, the sewage containing stone powder is directly connected to the water supply system of the mixing station, which can stably supply concrete batching, reduce the amount of binder used in the mixing station, save the cost of concrete preparation, reduce the discharge of sewage, and realize water conservation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the drawings and embodiments.

[0026] Figure 1 It is a schematic diagram of the process layout of the present invention in the embodiment.

[0027] Figure 2 It is Figure 1 an enlarged structural schematic diagram of part A in

[0028] Figure 3 It is Figure 1 an enlarged structural schematic diagram of part B in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The present invention will be clearly described below in conjunction with the drawings in the embodiments of the present invention and specific embodiments. The description here is only used to explain the present invention, but not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work, any modifications, equivalent replacements, improvements, etc., shall be included in the protection scope of the present invention.

[0030] Embodiment

[0031] As Figures 1 to 3 shown, this embodiment provides a process for controlling the powder content of the finished material in a small-scale sand and gravel processing system. The small-scale sand and gravel processing system includes a feeding conveyor 1, a finished material conveyor 2 and a head discharge hopper 3. Both the feeding conveyor and the finished material conveyor are belt conveyors. The top of the head discharge hopper is correspondingly arranged at the discharge end of the feeding conveyor, and the bottom of the head discharge hopper is connected to the feeding end of the finished material conveyor. The process for controlling the powder content of the finished material includes the following steps:

[0032] 1) A feeding sealing guide trough 4 and a finished material sealing guide trough 5 are respectively arranged on the feeding conveyor and the finished material conveyor, and the head discharge hopper is connected between the feeding sealing guide trough and the finished material sealing guide trough to form an overall sealing system;

[0033] 2) A vibrating feeding device and a spring receiving plate are arranged in the head discharge hopper to accelerate the separation of aggregate and bone powder and improve the air collection property of the upper space of the head discharge hopper;

[0034] 3) An air extraction duct 6 with adjustable air extraction volume is respectively arranged on the material receiving and sealing guide chute and the head discharge hopper. The airflow containing stone powder is sucked away under the negative pressure of the variable-frequency air extraction fan 7, and the qualified aggregate falls onto the finished product conveyor and is transported to the downstream process;

[0035] 4) The extracted airflow is introduced into the transition water tank 8 filled with washing water. The stone powder in the airflow is collected in the washing water to maintain the stability of the air volume and the amount of collected stone powder. After the mixture of the washing water and the stone powder is stirred evenly, it is supplied to the sewage weighing system;

[0036] 5) The mixture in the sewage weighing system is calculated and proportioned and then supplied to the water used by the mixing plant, reducing the consumption of the binder in the mixing plant.

[0037] Among them, a regulating butterfly valve 9 is arranged on each air extraction duct to regulate the air volume and the opening and closing of the air extraction duct for different requirements.

[0038] Specifically, air extraction ducts are respectively arranged at the tail, middle part of the material receiving and sealing guide chute and the upper and lower parts of the head discharge hopper. The variable-frequency air extraction fan is connected to each air extraction duct through the main air extraction pipe 10 to achieve efficient collection of stone powder in the whole sealing system.

[0039] In this embodiment, the vibrating blanking device includes a vibrating motor 11 and a bulk material plate 12. The top of the bulk material plate is hinged in the bottom plate in the middle of the head discharge hopper. The vibrating motor is fixed under the bottom plate in the middle of the head discharge hopper and is fixedly connected to the bulk material plate through a vibration conduction frame 13. The vibration conduction frame is hermetically and slidably connected to the bottom plate in the middle of the head discharge hopper. This setting can strengthen the separation effect of the aggregate and the stone powder in the head discharge hopper.

[0040] Among them, the spring receiving plate includes a receiving plate 14 and a spring 15. The receiving plate is arranged opposite to the head roller 16 of the receiving conveyor, and the top end of the receiving plate is hinged to the head discharge hopper. The middle part of the bottom side of the receiving plate is elastically connected to the inner wall of the head discharge hopper through a spring. On the one hand, it helps to ensure the formation of negative pressure in the upper area of the head discharge hopper and ensure the suction effect of the stone powder. On the other hand, it helps to strengthen the separation of the stone powder in the aggregate.

[0041] Specifically, a stirring motor 17 is arranged on the top of the transition water tank. The output shaft of the stirring motor is drivingly connected with a stirring shaft 18. The stirring shaft is inserted into the washing water, and stirring blades 19 are arranged at the bottom of the stirring shaft. One end of the stirring blade far away from the stirring shaft is fixedly connected to the middle part of the stirring shaft through an inclined rod 20, which is used to realize the uniform mixing of the washing water and the stone powder, facilitating the stable transportation and reliable metering of the mixture.

[0042] More specifically, the sewage weighing system includes a bracket 21 and a weighing hopper 22 connected to the bracket. A feeding pipe 23 is provided on the bracket. The feeding end of the feeding pipe is communicated with the discharge port of the transition water tank, and the discharge end of the feeding pipe corresponds to the feeding port of the weighing hopper and is arranged without contact to ensure the accuracy of weighing. A slurry pump 24 is provided at the end of the feeding pipe close to the transition water tank, which is convenient for transporting the uniformly mixed mixture in the transition water tank into the weighing hopper for accurate measurement.

[0043] The working principle of the present invention is as follows: By forming an integral sealing system, the dust generation during transportation can be reduced and the air balance requirement of the entire sealing system can be met. By setting up air extraction pipes, the airflow containing stone powder is sucked away under the action of negative pressure. Adjusting butterfly valves are provided on each air extraction pipe to adjust the air volume and the opening and closing of the air extraction pipes for different requirements. A spring receiving plate and a vibrating feeding device are arranged in the head discharge hopper. The vibration source is provided by a small-power vibration motor, so that when the aggregate is discharged from the head roller of the receiving conveyor, it is in a scattered state under the vibration effect, which is beneficial to the powder removal of the aggregate. The setting of the spring receiving plate is beneficial to the formation of negative pressure in the sealing system. The air extraction pipes are provided with a negative pressure air source by a variable-frequency induced draft fan, so that the airflow containing stone powder falls into the transition water tank under the guidance of gravity and wind force. By setting a stirring motor, a stirring shaft and stirring blades in the transition water tank, the sewage content of the sewage is kept uniform and precipitation and caking are prevented. By adjusting the variable-frequency induced draft fan and changing the opening degree of the adjusting butterfly valve, the air extraction volume and the powder removal volume are kept constant, so that the sewage ratio in the transition water tank can also be kept dynamically constant. After calculation, it can be stably proportioned to the sewage weighing system and supplied to the mixing plant for use after calculation and proportioning, so as to reduce the amount of binder used in the mixing station and achieve the purpose of cost saving.

[0044] The embodiments of the present invention have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments.

Claims

1. A process for controlling the powder content rate of finished materials in a small-scale sand and gravel processing system, the small-scale sand and gravel processing system comprising a receiving conveyor, a finished material conveyor, and a head discharge hopper, wherein the top of the head discharge hopper is correspondingly arranged at the discharge end of the receiving conveyor, and the bottom of the head discharge hopper is connected to the receiving end of the finished material conveyor, characterized in that, The finished product powder content control process includes the following steps: 1) Arrange a receiving material sealing guiding trough and a finished product material sealing guiding trough on the receiving conveyor and the finished product conveyor respectively, and connect the head discharge hopper between the receiving material sealing guiding trough and the finished product material sealing guiding trough to form an overall sealing system; 2) Set a vibrating feeding device and a spring receiving plate in the head discharge hopper to accelerate the separation of aggregate and bone powder and improve the air collection property of the upper space of the head discharge hopper; 3) Set air extraction pipes with adjustable air extraction volume on the receiving material sealing guiding trough and the head discharge hopper respectively, and suck away the air flow containing stone powder under the negative pressure of the variable frequency air extraction fan, and the qualified aggregate falls onto the finished product conveyor and is transported to the downstream process; 4) Connect the extracted air flow into a transition water tank filled with washing water, collect the stone powder in the air flow in the washing water, maintain the stability of the air volume and the amount of collected stone powder, stir the mixture of washing water and stone powder evenly and supply it to the sewage weighing system; 5) Calculate the ratio of the mixture in the sewage weighing system and supply it to the water used in the mixing station to reduce the consumption of the binder in the mixing station.

2. The finished product powder content control process according to claim 1, characterized in that A regulating butterfly valve is provided on each air extraction pipe to regulate the air volume and the opening and closing of the air extraction pipe for different requirements.

3. The finished product powder content control process according to claim 2, characterized in that Air extraction pipes are respectively arranged at the tail, middle part of the receiving material sealing guiding trough and the upper and lower parts of the head discharge hopper, and the variable frequency air extraction fan is connected to each air extraction pipe through an air extraction main pipe.

4. The finished product powder content control process according to claim 1, characterized in that, The vibrating feeding device includes a vibrating motor and a material spreading plate. The top of the material spreading plate is hinged inside the bottom plate in the middle of the head discharge hopper. The vibrating motor is fixed under the bottom plate in the middle of the head discharge hopper and is fixedly connected to the material spreading plate through a vibration conduction frame. The vibration conduction frame is hermetically and slidably connected to the bottom plate in the middle of the head discharge hopper.

5. The finished product powder content control process according to claim 1, characterized in that, The spring receiving plate includes a receiving plate and a spring. The receiving plate is arranged opposite to the head roller of the receiving conveyor, and the top end of the receiving plate is hinged to the head discharge hopper. The middle part of the bottom side of the receiving plate is elastically connected to the inner wall of the head discharge hopper through a spring.

6. The finished product powder content control process according to claim 1, characterized in that: A stirring motor is provided at the top of the transition water tank. The output shaft of the stirring motor is drivingly connected with a stirring shaft. The stirring shaft is inserted into the washing water, and stirring blades are provided at the bottom of the stirring shaft. One end of the stirring blade far away from the stirring shaft is fixedly connected to the middle part of the stirring shaft through an inclined rod.

7. The finished product powder content control process according to claim 1, characterized in that: The sewage weighing system includes a bracket and a weighing hopper connected to the bracket. A feeding pipe is provided on the bracket. The feeding end of the feeding pipe is communicated with the discharge port of the transition water tank, and the discharging end of the feeding pipe corresponds to the feeding port of the weighing hopper and is arranged without contact. A slurry pump is provided at the end of the feeding pipe close to the transition water tank.

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