Control system for multi-stage screening of machine-made sand

Abstract

The utility model relates to the technical field of machine-made sand processing, and particularly discloses a machine-made sand multi-stage screening control system which comprises a shell provided with an air inlet, an air outlet, a feeding port and a discharging port, the feeding port is formed in the upper portion of the shell, and the discharging port is formed in the lower portion of the shell. The device is characterized by further comprising a controller, a wind speed sensor, an adjusting air door, a fan and a plurality of flow guide plates. The wind speed sensor is used for measuring the airflow speed of the air inlet and installed on the air inlet, and the output end of the wind speed sensor is connected with the input end of the controller. The flow guide plates are used for dispersing airflow in the vertical direction of the air inlet, the multiple flow guide plates are transversely installed in the height direction of the air inlet, the width of gaps formed by the multiple flow guide plates and the air inlet is gradually increased from top to bottom, and the flow guide plates can rotate in the vertical direction through the flow guide plate driving mechanism. The input end of the guide plate driving mechanism is connected with the output end of the controller; the adjusting air door is used for opening and closing the air outlet and installed on the air outlet, and the input end of the adjusting air door is connected with the output end of the controller. The fan is used for forming airflow flowing from the air inlet to the air outlet in the shell, and the input end of the fan is connected with the output end of the controller; the controller is used for controlling opening and closing of the guide plate driving mechanism according to the airflow speed, controlling opening and closing of the fan and controlling opening and closing of the adjusting air door. According to the scheme, the problem that the multi-stage distinguishing effect of sand is poor due to the fact that airflow control is not accurate enough during multi-stage screening of existing machine-made sand can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of machine-made sand processing, in particular to a control system for multi-stage screening of machine-made sand. Background Art

[0002] At present, the basic process of sand aggregate production is: purchasing ore, vibrating and washing the ore to wash away the mud on the stone, selecting and classifying, crushing, vibrating and sorting, dust removal, crushing, grading, and obtaining machine-made sand with a particle size that meets the standard. The particle shape and size distribution of machine-made sand directly affect the production quality of concrete. The screening device for machine-made sand is a key equipment specially used for particle size grading of machine-made sand, which is widely used in modern sand aggregate production lines.

[0003] The practical screening equipment in the existing sand aggregate production line is mainly vibrating screen, and a small part uses air separation equipment for screening. However, the existing air separation and sorting mechanism is mainly used to separate stone powder and fine sand. The main purpose is to remove stone powder in fine sand. Generally, it can only achieve 2-3 types of screening, and cannot achieve multi-level sorting of sand.

[0004] In order to meet customers' different purchasing needs for sand particle size, our company has conducted research on the fine sorting technology of sand and proposed a new air separation mechanism. During the air separation process, the falling sand is blown by the horizontal airflow. When the sand is light, the horizontal falling distance is far, and when the sand is heavy, the horizontal falling distance is short. The air inlet of the common air separation mechanism is a channel structure, and the wind speed can only be controlled at a fixed value by controlling the speed of the fan. The control method is single. Since the sand particle size is distributed in the range of 0mm to 5mm and the sand has a small dead weight, it is impossible to completely disperse the sand and complete multiple levels of separation and elimination by relying solely on a single beam of constant airflow. The air separation result is not fine enough, and unqualified sand with small particle size is easy to fall into the qualified discharge port, and the particle size distribution range is relatively messy. Therefore, a control system for multi-stage screening of machine-made sand is proposed. Utility Model Content

[0005] The utility model provides a control system for multi-stage screening of machine-made sand, so as to solve the problem that the airflow control is not accurate enough during the multi-stage screening of the existing machine-made sand, resulting in poor multi-level separation effect of the sand.

[0006] In order to solve the above problems, the technical solution adopted by the utility model is as follows: it includes a shell body respectively provided with an air inlet, an air outlet, a material inlet, and a material outlet, the material inlet is arranged at the upper part of the shell body, and the material outlet is arranged at the lower part of the shell body, and also includes a controller, a wind speed sensor, an adjusting damper, a fan, and a guide plate; the wind speed sensor is used to measure the air flow speed at the air inlet, the wind speed sensor is installed on the air inlet, and the output end of the wind speed sensor is connected to the input end of the controller; the guide plate is used to disperse the air flow in the vertical direction of the air inlet, and multiple guide plates are arranged along the air inlet The guide plate can be rotated in the vertical direction by a guide plate driving mechanism, and the input end of the guide plate driving mechanism is connected to the output end of the controller; the regulating damper is used to open and close the air outlet, the regulating damper is installed on the air outlet, and the input end of the regulating damper is connected to the output end of the controller; the fan is used to form an airflow from the air inlet to the air outlet in the shell, and the input end of the fan is connected to the output end of the controller; the controller is used to control the opening and closing of the guide plate driving mechanism according to the airflow speed, control the opening and closing of the fan, and control the opening and closing of the regulating damper.

[0007] The basic principle of this scheme is: the wind speed in the shell is measured by a wind speed sensor. When the airflow passes through the guide plate at the air inlet, the guide plate disperses the airflow into multiple beams. The flow direction of the airflow is adjusted by controlling the rotation angle of the guide plate. Since the gap of the guide plate gradually increases from top to bottom, according to the Bernoulli principle, when the air inlet becomes narrower, the flow velocity increases, thereby controlling the wind speed of the air inlet, so that the wind speed of the air intake gradually increases from bottom to top, so that the sand is screened by multiple wind speeds during the falling process, which is conducive to the distinction of particle size.

[0008] The beneficial effects of this solution are as follows: in the existing air selection structure, the wind force is only regulated by the fan, and the airflow control is not precise enough, resulting in poor multi-level sand differentiation effect. This solution uses a wind speed sensor to measure the wind speed in real time to control the working state of the fan, and realizes the step-by-step distribution of the wind speed in the longitudinal direction through the spacing of multiple guide plates. The wind direction is controlled by the rotation of the guide plate, and the wind speed is regulated by controlling the opening and closing degree of the damper. When the shell in this solution is set to multiple, the airflow can be prevented from flowing back into the upper shell by adjusting the opening and closing state of the damper at the air outlet.

[0009] Furthermore, a conveying device is provided below the discharge port, and a flow sensor is provided in the discharge port. The flow sensor is used to measure the amount of sand flowing out of the discharge port, and the output end of the flow sensor is connected to the input end of the controller, and the input end of the conveying device is connected to the output end of the controller. The controller is also used to control the conveying speed of the conveying device according to the amount of sand at the discharge port. Since the amount of sand discharged after screening fluctuates, the speed of conveying to the rear material can be adjusted according to different weights to save energy.

[0010] Furthermore, the guide plate driving structure includes a rotating shaft, which is installed in the middle of the guide plate and is arranged along the length of the guide plate. The guide plate can be rotatably connected to the inner wall of the air inlet through the rotating shaft.

[0011] Furthermore, a pressure sensor is installed in the feed port, and the pressure sensor is used to detect the amount of sand in the feed port. The output end of the pressure sensor is connected to the input end of the controller, and the controller is also used to control the opening and closing of the feed port according to the amount of sand in the feed port. Since the flow rate of the sand feed port exists, the wind speed is adjusted according to the amount of sand to be distinguished.

[0012] Furthermore, there are two shells, namely a primary shell and a secondary shell. The outlet of the primary shell is connected to the inlet of the secondary shell. The number of guide plates in the air inlet of the primary shell is 3, and the number of guide plates at the air inlet of the secondary shell is 2.

[0013] Furthermore, four gaps are formed between the three guide plates of the first-stage shell and the air inlet, and the proportion of the four gaps to the total gaps ranges from top to bottom in the order of 15-18%, 18-22%, 22-28%, and 28-32%. The sand can be blown away at a high wind speed above the inside of the shell, so that the small-sized sand can fly to the discharge port near the air outlet under the action of wind.

[0014] Furthermore, the end of the deflector away from the inside of the shell is a slope that gradually widens along the wind direction. The front end is set to a triangular slope for easy diversion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the framework of an embodiment of the utility model;

[0016] Figure 2 It is a schematic side view of the structure of an embodiment of the utility model;

[0017] Figure 3 It is a schematic front view of the structure of an embodiment of the utility model. DETAILED DESCRIPTION

[0018] The following is further described in detail through specific implementation methods:

[0019] The figure marks in the drawings of the specification include: primary sorting mechanism 1, primary feed port 11, discharge port 13, air inlet 2, guide plate 21, damper 3, air outlet 4, fan 42, secondary sorting mechanism 5, secondary feed port 51, air outlet 6.

[0020] The embodiment is basically as shown in the attached Figure 1 To Attachment Figure 3 As shown:

[0021] A multi-stage continuous screening device for machine-made sand, such as Figure 2, 3 As shown, the multi-stage screening sorting mechanism in this embodiment is two-stage, including a primary sorting mechanism 1 and a secondary sorting mechanism 5. The shell of the primary sorting mechanism 1 is a primary shell, and the shell of the secondary sorting mechanism 5 is a secondary shell. The two shells are respectively provided with a feed port, a discharge port 13, an air inlet 2, and an air outlet 6. Among them, a primary feed port 11 is provided at the upper end of the shell of the primary sorting mechanism 1 near the air inlet 2, and a plurality of primary discharge ports 13 are provided at the lower end of the shell. The primary discharge ports 13 include unqualified discharge ports 13 and qualified discharge ports 13 arranged in sequence along the air inlet direction; a secondary feed port 51 is provided at the upper end of the shell of the secondary sorting mechanism 5 near the air inlet 2, and the unqualified discharge port 13 is connected with the secondary feed port 51 of the secondary sorting mechanism 5. In this embodiment, three secondary sorting mechanisms 5 are provided, namely, 2-1# machine, 2-2# machine, and 2-3# machine, so as to perform secondary screening on the sand flowing out of the three unqualified discharge ports 13.

[0022] A controller is provided on the outside of the shell. The air inlet 2 of the primary sorting mechanism 1 and the secondary sorting mechanism 5 are both provided with a guide plate 21. The guide plate 21 is rotatably connected to the air inlet 2 through a guide plate 21 driving mechanism. In this embodiment, the guide plate 21 driving mechanism includes a rotating shaft, which is arranged in the middle of the guide plate 21. The guide plate 21 can be vertically rotated in the air inlet 2 through the rotating shaft. The input end of the guide plate 21 driving mechanism is connected to the output end of the controller. The air outlet 6 of the secondary sorting mechanism 5 and the primary sorting mechanism 1 is both provided with an adjusting damper 3. The input end of the adjusting damper 3 is connected to the output end of the controller. The air volume in different sorting mechanisms can be controlled by adjusting the opening and closing degree of the damper 3. The air outlet 6 is connected to a fan 42 through a pipeline. The fan 42 is used to form an airflow from the air inlet 2 to the air outlet 6 in the shell. The input end of the fan 42 is connected to the output end of the controller. The fan 42 in this embodiment is a variable frequency fan 42, so that it can be synchronously adjusted according to the amount of sand to be processed.

[0023] A wind speed sensor for measuring the air flow speed at the air inlet 2 is installed at the air inlet 2, and the output end of the wind speed sensor is connected to the input end of the controller. The controller is used to control the frequency of the fan 42, adjust the opening and closing of the damper 3, and the rotation and stop of the guide plate 21 driving mechanism according to the air flow speed.

[0024] A pressure sensor is installed in the feed port, and the pressure sensor is used to detect the amount of sand in the feed port. The output end of the pressure sensor is connected to the input end of the controller, and the controller is also used to control the opening and closing of the feed port according to the amount of sand in the feed port. A conveying device is provided below the discharge port 13. The conveying device in this embodiment is a conveyor belt. A flow sensor is provided in the discharge port 13, and the flow sensor is used to measure the amount of sand flowing out of the discharge port 13. The output end of the flow sensor is connected to the input end of the controller, and the input end of the conveying device is connected to the output end of the controller. The controller is also used to control the conveying speed of the conveying device according to the amount of sand in the discharge port 13.

[0025] In order to further improve the accuracy of sand differentiation, the number of guide plates 21 at the air inlet 2 of the first-level shell in this embodiment is 3, and 4 gaps are formed between the 3 guide plates 21 and the air inlet 2, and the proportion of the 4 gaps to the total gaps ranges from top to bottom in the order of 15-18%, 18-22%, 22-28%, and 28-32%. By controlling the gap from top to bottom of the guide plate 21, the gap from top to bottom gradually increases. According to the Bernoulli principle, when the air inlet 2 becomes narrower, the flow velocity increases, thereby controlling the wind speed of the air inlet 2, so that the wind speed of the incoming wind gradually increases from bottom to top; thereby, the sand can be blown away at a higher wind speed above the inside of the shell, so that the sand with small particle size can fly to the discharge port 13 near the air outlet 6 under the action of wind force. Further, the end of the guide plate 21 away from the inside of the shell is a slope that gradually widens along the wind direction. As shown in the figure, the front end of the guide plate 21 is a triangle, and the rear end is a rectangle, and the tip of the triangle is used to guide the airflow.

[0026] The specific implementation process is as follows:

[0027] The wind speed in the shell is measured by a wind speed sensor. When the airflow passes through the guide plate 21 at the air inlet, the guide plate 21 disperses the airflow into multiple beams. The flow direction of the airflow is adjusted by controlling the rotation angle of the guide plate 21. Since the gap of the guide plate 21 gradually increases from top to bottom, according to the Bernoulli principle, when the air inlet 2 becomes narrower, the flow velocity increases, thereby controlling the wind speed of the air inlet 2, so that the wind speed of the incoming air gradually increases from bottom to top, so that the sand is screened by multiple wind speeds during the falling process, which is conducive to the distinction of particle sizes.

[0028] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A control system for multi-stage screening of machine-made sand, comprising a housing respectively provided with an air inlet, an air outlet, a material inlet, and a material outlet, wherein the material inlet is arranged at the upper part of the housing, and the material outlet is arranged at the lower part of the housing, characterized in that: It also includes a controller, a wind speed sensor, an adjustable damper, a fan, and several guide plates; The wind speed sensor is used to measure the air flow speed at the air inlet. The wind speed sensor is installed on the air inlet, and the output end of the wind speed sensor is connected to the input end of the controller; The guide plate is used to disperse the airflow in the vertical direction of the air inlet. The multiple guide plates are installed horizontally along the height of the air inlet, and the width of the gap formed by the multiple guide plates and the air inlet gradually increases from top to bottom. The guide plate can be rotated in the vertical direction through the guide plate driving mechanism, and the input end of the guide plate driving mechanism is connected to the output end of the controller; The regulating damper is used to open and close the air outlet. The regulating damper is installed on the air outlet, and the input end of the regulating damper is connected to the output end of the controller. The fan is used to form an airflow from the air inlet to the air outlet in the housing, and the input end of the fan is connected to the output end of the controller; The controller is used to control the opening and closing of the guide plate driving mechanism according to the air flow speed, control the opening and closing of the fan, and control the opening and closing of the regulating damper.

2. A control system for multi-stage screening of machine-made sand according to claim 1, characterized in that: A conveying device is provided below the discharge port, and a flow sensor is provided in the discharge port. The flow sensor is used to measure the amount of sand flowing out of the discharge port. The output end of the flow sensor is connected to the input end of the controller, and the input end of the conveying device is connected to the output end of the controller. The controller is also used to control the conveying speed of the conveying device according to the amount of sand at the discharge port.

3. A control system for multi-stage screening of machine-made sand according to claim 2, characterized in that: The guide plate driving structure comprises a rotating shaft, which is installed at the middle part of the guide plate and is arranged along the length of the guide plate. The guide plate can be rotatably connected to the inner wall of the air inlet through the rotating shaft.

4. A control system for multi-stage screening of machine-made sand according to claim 3, characterized in that: A pressure sensor is installed in the feed port, and the pressure sensor is used to detect the amount of sand in the feed port. The output end of the pressure sensor is connected to the input end of the controller, and the controller is also used to control the opening and closing of the feed port according to the amount of sand in the feed port.

5. A control system for multi-stage screening of machine-made sand according to claim 4, characterized in that: There are two shells, namely a primary shell and a secondary shell. The discharge port of the primary shell is connected to the inlet port of the secondary shell. There are three guide plates in the air inlet of the primary shell, and there are two guide plates in the air inlet of the secondary shell.

6. A control system for multi-stage screening of machine-made sand according to claim 5, characterized in that: Four gaps are formed between the three guide plates of the first-level shell and the air inlet, and the proportions of the four gaps to all gaps range from top to bottom in the order of 15-18%, 18-22%, 22-28%, and 28-32%.

7. A control system for multi-stage screening of machine-made sand according to claim 6, characterized in that: One end of the deflector away from the interior of the shell is a slope that gradually widens along the wind direction.

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