A model-controlled screen with adjustable gradation

Abstract

The present invention relates to the technical field of material screening, and in particular to a mold-controlled screen with adjustable gradation, comprising an air selection chamber and a screening chamber; an air inlet is arranged on the left side of the air selection chamber, a feed inlet is arranged on the top of the left side, and an air outlet is arranged on the top of the right side, a blower is also arranged at the air outlet, and an exhaust fan is also arranged at the air outlet; the screening chamber comprises a first layer of screen, a first layer of blind plate arranged obliquely, a second layer of screen arranged obliquely, a second layer of blind plate arranged obliquely, a third layer of screen arranged obliquely, and an adjustment baffle; the air selection chamber is fixedly connected to the screening chamber, a material collection bin is arranged at the bottom of the screening chamber, and a vibration source is arranged on the left shell. The mold-controlled screen with adjustable gradation provided in the present application has the advantages of improving space utilization and screening efficiency, and being able to control the gradation of finished materials.

Description

Technical Field

[0001] The invention relates to the technical field of material screening, in particular to a mold-controlled screen with adjustable grading. Background Art

[0002] As an important structural material component of infrastructure, sand and gravel are the main raw materials for basic products in the construction industry such as concrete and cement components. Sand and gravel can be divided into two categories: natural sand directly mined and artificial sand, of which artificial sand accounts for about 68%. At present, natural sand resources are close to exhaustion, and the development of artificial sand has become the mainstream trend. The existing artificial sand industry has many problems such as low product quality, high pollution in the production process, and low resource utilization. The development model is too extensive and does not conform to the theme of green environmental protection. The VU sand making system came into being. With the application and development of the sand making system, higher requirements are also put forward for its functions.

[0003] The particle sizes of materials crushed by the traditional VU sand making system sand making machine are different. There are sand and gravel with a particle size of more than 5 mm, which is too large, and fine powder below 0.075 mm, which is harmful to the grading of machine-made sand. In order to meet the needs of high-quality concrete, it is necessary to separate the coarse sand above 5 mm and the fine powder below 0.075 mm through the mold-controlled screen to obtain useful sand between 5 mm and 0.075 mm. The mold-controlled screen uses forced blowing to separate sand particles and fine powder. If the processing capacity is increased, the thickness of the material layer will inevitably increase and the separation effect will be reduced. The traditional method to improve screening efficiency is to increase the screen area and increase the material input, but this requires increasing the volume of the screening chamber, which increases the structural size and weight, affecting the installation and use of the mold-controlled screen in the sand making system and cost control, and reducing competitiveness. At the same time, with the development of production technology in the construction industry, higher requirements are also put forward for the grading of machine-made sand, but the traditional mold-controlled screen can only complete the screening function, and the grading of the finished machine-made sand is uncontrollable, which affects the development needs of stone production. Summary of the invention

[0004] In order to solve the problem that the gradation of the existing finished machine-made sand is uncontrollable, the present invention proposes a mold-controlled screen with adjustable gradation which can improve the screening efficiency.

[0005] The technical solution adopted by the present invention is:

[0006] A mold-controlled screen with adjustable gradation, comprising an air selection chamber and a screening chamber; an air inlet is arranged on the left side of the air selection chamber, a material feed port is arranged on the top of the left side, and an air outlet is arranged on the top of the right side, a blower is also arranged at the air outlet, and an exhaust fan is also arranged at the air outlet; the screening chamber comprises a first layer of screen mesh, a first layer of blind plate arranged obliquely, a second layer of screen mesh arranged obliquely, a second layer of blind plate arranged obliquely, a third layer of screen mesh arranged obliquely, and an adjustment baffle; the air selection chamber is fixedly connected to the screening chamber, a material collection bin is arranged at the bottom of the screening chamber, and a vibration source is arranged on the left shell;

[0007] The first layer of screens comprises a horizontal screen arranged in the horizontal direction and an inclined screen inclined downward at an angle α to the horizontal, the horizontal screen and the inclined screen are connected to form a structure with a bending angle; the first layer of screens is connected to the first layer of blind plates to form an independent first closed space, a first finished material outlet is arranged at the low point of the first closed space, and the first finished material outlet is connected to the aggregate bin;

[0008] A second layer of screen and a second layer of blind plate are arranged in sequence below the first layer of blind plate, the second layer of screen and the second layer of blind plate are connected to form an independent second closed space, and an adjustment baffle is arranged at the connection, the adjustment baffle is hinged to the right end of the second layer of screen; a second finished material outlet is arranged at the low point of the second closed space;

[0009] A third layer of screen is arranged below the second layer of blind plate, and the collection bin is arranged below the third layer of screen. The collection bin is connected with the third layer of screen to form a third closed space; a first return port is arranged at the low point of the space between the second layer of screen and the first layer of blind plate, and a second return port is arranged at the low point of the space between the third layer of screen and the second layer of blind plate.

[0010] Furthermore, the mesh size of the first layer of sieve is consistent with that of the third layer of sieve, and the mesh size of the second layer of sieve is smaller than that of the first layer of sieve and the third layer of sieve; the mesh size of the first layer of sieve and the third layer of sieve is 5 mm.

[0011] Furthermore, the angle α with the horizontal is in the range of 25°≤α≤40°, and when α is 30°, the screening effect is optimal.

[0012] Furthermore, the vibration source adopts a linear vibration source or a circular vibration source, which generates continuous vibration from right to left during operation.

[0013] Furthermore, the adjustment baffle includes a straight baffle, a rotating shaft, and a bottom plate vertically connected to the second layer of screen, which are connected in sequence, and bolts are installed at both ends of the rotating shaft; the adjustment baffle is a hinge structure, and the bottom plate is fixedly connected to the right end of the second layer of screen to form a right-angle bending structure; the tightening bolt can adjust the position of the straight baffle; when the adjustment baffle is rotated to the left to the extreme position, the straight baffle and the first layer of blind plate are closed; when it is rotated to the right to the extreme position, the straight baffle contacts the right side shell of the screening chamber to close the third layer of screen.

[0014] Furthermore, the first finished material outlet, the second finished material outlet, the first return material outlet, and the second return material outlet are all conical bucket structures, and the bottom of the collecting bin is connected to a discharger.

[0015] Furthermore, the air volume of the exhaust fan is greater than the air volume of the blower.

[0016] The beneficial effects of the present invention are:

[0017] 1. The air volume out of the air separation chamber is greater than the air volume inlet, ensuring that the fine powder can be accurately separated when the material is discharged. A negative pressure is formed in the screening chamber connected to it, and the materials on each layer of the screen are subject to a weak upward airflow, which can further enhance the separation and collection of fine powder.

[0018] 2. Divide the first layer of screen into two sections, and use a vibration source moving from right to left. The first section increases the efficiency of the initial screening and quickly separates larger materials from the screening chamber. The second section screens the remaining materials, and the entire screening process is completed through layer-by-layer screening. Materials with large particle sizes can be discharged directly without participating in screening, which improves screening efficiency and screening effect.

[0019] 3. The adjusting baffle is set at the rightmost end of the second layer of screen and can rotate freely through the rotating shaft. When it is rotated to the left to the extreme position, it just closes the screening channel of the first layer of blind plate and the second layer of screen, and the material will directly enter the third layer of screen for screening; similarly, when it is rotated to the right to the extreme position, it just closes the channel to the third layer of screen; an adjusting baffle is set at the connecting position of the second layer of screen and the second layer of blind plate. By controlling the position of the adjusting baffle, the mesh number and size of the finished material can be controlled, and the function of adjustable grading of the finished material can be realized.

[0020] 4. The model-controlled screen of the present application improves the compactness and screening efficiency of the screening device, which is about 25% higher than that of the traditional model-controlled screen.

[0021] In summary, the mold-controlled screen with adjustable gradation provided in the present application has the advantages of improving space utilization and screening efficiency and being able to control the gradation of finished materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the screening chamber in the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of the regulating baffle in the present invention;

[0025] Figure 4 It is a schematic diagram of an embodiment of the present invention.

[0026] In the figure: 1. air selection chamber; 2. screening chamber; 3. air inlet; 4. feed port; 5. air outlet; 6. first layer of screen; 6-1. horizontal screen; 6-2. inclined screen; 7. first layer of blind plate; 8. second layer of screen; 9. second layer of blind plate; 10. third layer of screen; 11. adjusting baffle; 12. collecting bin; 13. vibration source; 14. first finished material outlet; 15. second finished material outlet; 16. first return material outlet; 17. second return material outlet; 18. straight baffle; 19. rotating shaft; 20. bottom plate; 21. bolts. DETAILED DESCRIPTION

[0027] The core of the invention is to provide a mold-controlled screen with adjustable grading.

[0028] The content of the present invention will be further described below in conjunction with the accompanying drawings:

[0029] When used specifically, Figures 1 to 4As shown, the vibration source 13 is fixed on the left shell of the screening chamber 2, and a circular vibration source is used to generate continuous vibration from right to left, driving the entire screening chamber 2 to move; the air volume of the blower installed on the left side of the air selection chamber 1 is much smaller than the air volume of the exhaust fan installed on the right side, so that the entire model-controlled screen is in a negative pressure state. When in use, the stone powder to be screened is put into the feed port 4, and the powder below 0.075 mm is directly discharged from the air outlet 5 by the wind separation of the air selection chamber 1. After being separated by wind, the materials are dispersed laterally under the influence of the airflow. Materials with larger particle size and heavier weight are less affected by the airflow and will directly fall to the first return port 16 or to the horizontal screen 6-1 of the first layer of screen 6. Materials with particle size larger than the mesh size are vibrated from right to left by the vibration source 13 and move to the left and are sent to the first return port 16. On the contrary, materials with smaller particle size and lighter weight will be blown laterally by the airflow and scattered on the inclined screen 6-2 of the first layer of screen 6. Since the dispersed materials are not mixed with materials with larger particle size and no large materials will affect the screening, materials with particle size smaller than the mesh size can quickly pass through the first layer of screen 6, fall on the first layer of blind plate 7, and finally flow into the aggregate bin 12 through the first finished material outlet 14, thereby improving the screening efficiency. Materials that have not passed through the first layer of screen 6 or have not been fully screened due to material accumulation will move backward along the screen to the adjusting baffle 11 under the influence of gravity and the vibration source 13. When the gradation of the screened finished materials meets the requirements, the adjusting baffle 11 will close the second layer of screen 8, so that all the materials will flow to the third layer of screen 10 for screening, and the materials that have not passed through the third layer of screen 10 will flow into the second return port 17. The materials that have passed through the third layer of screen 10 will be collected by the collecting bin 12 as the final finished materials, and the collecting bin will be connected to a discharger to facilitate the collection of the finished materials. When the gradation of the screened finished materials cannot meet the requirements, the adjusting baffle 11 will close the third layer of screen 10, so that all the materials will flow to the second layer of screen 8 for screening, and will be collected by the second layer of blind plate 9, and finally will flow out from the second finished material outlet 15 for collection, and the materials that have not passed through the second layer of screen 8 will flow to the first return port 16. The mesh size of the first layer of sieve 6 and the third layer of sieve 10 is consistent with that of 5 mm, and the mesh size of the second layer of sieve 8 is smaller than that of the first layer of sieve 6 and the third layer of sieve 10. Therefore, when the gradation of the finished material meets the requirements, only the third layer of sieve 10 is needed to work, and the second layer of sieve 8 is not needed for screening to improve work efficiency; when the gradation requirements are not met, the second layer of sieve 8 with a smaller mesh must be used for screening to meet the gradation requirements.

[0030] When the baffle 11 is adjusted to close the second layer of screen 8 and the third layer of screen 10, two extreme values ​​of the finished material gradation are obtained respectively. When the finished material gradation between the two extreme values ​​is required, the baffle 11 is adjusted to an appropriate position, and the proportion of the material entering the second layer of screen 8 and the third layer of screen 10 is adjusted to obtain the corresponding finished material gradation.

[0031] The material flows from the first screen 6 to the second screen 8 or the third screen 10, which indirectly increases the screen area, prolongs the movement time of the material on the screen, and improves the screening efficiency, but basically does not increase the volume of the mold-controlled screen.

[0032] The angle between the inclined screen 6-2 and the horizontal direction is α, and the value range of α is 25°≤α≤40°, and when α is 30°, the screening effect is best; the purpose of the inclined screen 6-2 and the first blind plate 7, the second screen 8, the second blind plate 9, and the third screen 10 installed obliquely in the screening chamber 2 is to drive the material to move under the gravity of the material itself and the vibration of the vibration source 13, and at the same time facilitate the collection of returned materials and finished materials in each layer. The angle of the inclined installation is comprehensively adjusted based on factors such as the specific size of the target material, gravity, and convection wind speed in the air separation chamber 1. The larger and steeper the inclination angle, the faster the material rolls, the faster the screening speed, and the slightly worse the separation effect. On the contrary, the screening speed is slow and the separation effect is better. In actual use, it can be freely adjusted according to the gradation of the screened material to improve efficiency while ensuring good screening quality.

[0033] Through the structural design of the screen inside the screening chamber 2, the screening area of ​​the screen can be increased without substantially increasing the volume of the mold-controlled screen, and the screening efficiency can be increased by about 25%, and there is no need to change the installation dimensions of the mold-controlled screen in the VU sand making system. The first layer of screen 6 has a bidirectional material movement structure, which can increase the screen area and divide the material into two parts for screening. Materials with large particle sizes can be discharged directly without participating in screening, thereby improving screening efficiency and screening effect. Therefore, an adjustment baffle 11 is set at the connection position between the second layer of screen 8 and the second layer of blind plate 9, so that the function of adjustable grading of finished materials can be realized.

[0034] It can be seen from the above specific implementation methods that the mold-controlled screen with adjustable gradation provided by the present invention has the advantages of improving space utilization and screening efficiency and being able to control the gradation of finished materials.

Claims

1. A mold-controlled screen with adjustable gradation, characterized in that: The invention comprises an air selection chamber (1) and a screening chamber (2); the air selection chamber (1) is provided with an air inlet (3) on the left side, a material feed port (4) on the top of the left side, and an air outlet (5) on the top of the right side; a blower is also provided at the air outlet (5); an exhaust fan is also provided at the air outlet (5); the screening chamber (2) comprises a first layer of screen (6), a first layer of blind plate (7) arranged obliquely, a second layer of screen (8) arranged obliquely, a second layer of blind plate (9) arranged obliquely, a third layer of screen (10) arranged obliquely, and an adjusting baffle (11); the air selection chamber (1) is fixedly connected to the screening chamber (2); a material collecting bin (12) is provided at the bottom of the screening chamber (2), and a vibration source (13) is provided on the left shell; The first layer of screen (6) comprises a horizontal screen (6-1) arranged in a horizontal direction and an inclined screen (6-2) inclined downward and forming an angle α with the horizontal, wherein the horizontal screen (6-1) and the inclined screen (6-2) are connected to form a structure with a bending angle; the first layer of screen (6) is connected to the first layer of blind plate (7) to form an independent first closed space, a first finished material outlet (14) is arranged at the low point of the first closed space, and the first finished material outlet (14) is connected to the aggregate bin (12); A second layer of screen (8) and a second layer of blind plate (9) are arranged in sequence below the first layer of blind plate (7); the second layer of screen (8) and the second layer of blind plate (9) are connected to form an independent second closed space, and an adjustment baffle (11) is arranged at the connection, and the adjustment baffle (11) is hinged to the right end of the second layer of screen (8); a second finished material outlet (15) is arranged at the low point of the second closed space; A third layer of screen (10) is arranged below the second layer of blind plate (9), and the material collection bin (12) is arranged below the third layer of screen (10), and the material collection bin (12) is connected to the third layer of screen (10) to form a third closed space; a first material return port (16) is arranged at the lowest point of the space between the second layer of screen (8) and the first layer of blind plate (7), and a second material return port (17) is arranged at the lowest point of the space between the third layer of screen (10) and the second layer of blind plate (9); the mesh size of the first layer of screen (6) and the third layer of screen (10) is the same, and the mesh size of the second layer of screen (8) is smaller than that of the first layer of screen (6) and the third layer of screen (10); the mesh size of the first layer of screen (6) and the third layer of screen (10) is 5 mm; The adjusting baffle (11) comprises a straight baffle (18), a rotating shaft (19), and a bottom plate (20) vertically connected to the second layer of screen (8) which are connected in sequence, and bolts (21) are installed at both ends of the rotating shaft (19); the adjusting baffle (11) is a hinge structure, and the bottom plate (20) is fixedly connected to the right end of the second layer of screen (8) to form a right-angle bending structure; the tightening bolt (21) can adjust the position of the straight baffle (18); when the adjusting baffle (11) is rotated to the left to the limit position, the straight baffle (18) and the first layer of blind plate (7) are closed; when the adjusting baffle (11) is rotated to the right to the limit position, the straight baffle (18) contacts with the right side shell of the screening chamber (2) to close the third layer of screen (10).

2. The mold-controlled screen with adjustable gradation according to claim 1, characterized in that: The value range of the angle α is 25°≤α≤40°, and when α is 30°, the screening effect is optimal.

3. The mold-controlled screen with adjustable gradation according to claim 1, characterized in that: The vibration source (13) is a linear vibration source or a circular vibration source, and generates continuous vibration from right to left during operation.

4. The adjustable grading mold-controlled screen according to claim 1, characterized in that: The first finished material outlet (14), the second finished material outlet (15), the first material return port (16), and the second material return port (17) are all conical bucket structures, and the bottom of the collecting bin (12) is connected to a discharger.

5. The mold-controlled screen with adjustable gradation according to claim 1, characterized in that: The air volume of the exhaust fan is greater than the air volume of the blower.

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