Device and system for automatically controlling content of mountain flour in machine-made sand

Abstract

The invention relates to the technical field of machine-made sand, and particularly discloses an automatic control device for the content of stone powder in machine-made sand, which comprises a gravel and stone powder mixture conveying pipe, the bottom of the gravel and stone powder mixture conveying pipe is communicated with a stone powder removal treatment pipe, and one end of the outer wall of the stone powder removal treatment pipe is communicated with a negative pressure supply filter pipe. The other end of the outer wall of the stone powder removal treatment pipe is communicated with a filtering air inlet pipe; and strip-shaped guide holes are formed in the two sides of the stone powder removal treatment pipe. Through continuous rotation of the movable conveying roller and the rotary conveying roller, raw materials can intermittently enter the stone powder removal treatment pipe and are intermittently discharged from the stone powder removal treatment pipe, so that the raw materials can stay in the stone powder removal treatment pipe for a period of time; and therefore, the stone powder with specified granularity in the raw materials in the stone powder removal treatment pipe can be more sufficiently extracted and removed by negative pressure from the negative pressure supply filter pipe.

Description

Technical Field

[0001] The invention relates to the technical field of machine-made sand, and in particular to an automatic control device and system for stone powder content in machine-made sand. Background Art

[0002] Concrete is one of the main raw materials in the process of modern building construction. In the actual application process, it is necessary to mix other specified raw materials in concrete to ensure its strength during use. Sand and gravel are a typical type of concrete. According to different production methods, sand and gravel are also divided into different types, such as sand and gravel mined directly, and sand and gravel prepared by crushing by machinery and equipment. Among them, sand and gravel produced by the damage of machinery and equipment is also called machine-made sand. Machine-made sand will generate a part of stone powder during the production process, and these stone powders are also an indispensable part of the use of concrete, but their content needs to be maintained at a certain proportion. Therefore, it is necessary to adjust the stone powder content in the production process through the automatic control part of the stone powder content in the machine-made sand;

[0003] There are many ways to use the existing automatic control device for stone powder content in machine-made sand. One of the common ways is to adjust the wind force to determine the stone powder removal content. However, this method currently often simply uses negative pressure extraction to remove part of the stone powder during the transportation process. This method is prone to the raw materials being in contact with the negative pressure part for a short time during the transportation process, resulting in insufficient removal of stone powder of the specified particle size, which in turn easily leads to insufficient accuracy of the final stone powder content. Summary of the invention

[0004] The purpose of the present invention is to provide an automatic control device and system for the stone powder content in machine-made sand, so as to solve the problem that the stone powder of a specified particle size is not removed thoroughly enough in the above background, resulting in insufficient accuracy of the final stone powder content.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An automatic control device for stone powder content in machine-made sand comprises a sand-stone-stone powder mixture conveying pipe, the bottom of the sand-stone-stone powder mixture conveying pipe is connected to a stone powder removal processing pipe, one end of the outer wall of the stone powder removal processing pipe is connected to a negative pressure supply filter pipe, and the other end of the outer wall of the stone powder removal processing pipe is connected to a filter air inlet pipe;

[0007] Both sides of the stone powder removal treatment tube are provided with strip guide holes, and movable conveying rollers are arranged inside the strip guide holes, and a first accommodating transfer groove is arranged at one end of the outer wall of the movable conveying roller;

[0008] The stone powder removal processing tube is provided with a driving mechanism for driving the movable conveying roller to move;

[0009] A fixed mounting ring is installed on one side of the stone powder removal processing tube, and an arc-shaped extrusion limiting block is installed on the inner side wall of the fixed mounting ring, and an extrusion rod is installed on the outer side of one end of the movable conveying roller close to the fixed mounting ring;

[0010] The sand, gravel and stone powder mixture conveying pipe is provided with a conveying mechanism for intermittently sealing the conveying pipe;

[0011] Both ends of the movable conveying roller are provided with annular grooves, and the interior of the annular grooves is provided with movable mechanisms for scraping the negative pressure supply filter pipe and the filter air inlet pipe.

[0012] As a further solution of the present invention: the negative pressure supply filter tube and the filter air inlet pipe are both arranged obliquely, and the filter hole diameter on the negative pressure supply filter tube is larger than the filter hole diameter on the filter air inlet pipe.

[0013] As a further solution of the present invention: the central axis of the movable conveying roller is parallel to the transverse central axis of the stone powder removal processing tube, and the movable conveying roller can move in the strip guide hole.

[0014] As a further solution of the present invention: the driving mechanism includes an installation guide, which is installed on one side of the sand, gravel and stone powder mixture conveying pipe, a movable mounting plate is arranged inside the installation guide, and a spring is connected between the movable mounting plate and the installation guide, a first servo motor is installed on the side of the movable mounting plate close to the stone powder removal processing pipe, and the output end of the first servo motor is connected to the movable conveying roller.

[0015] As a further solution of the present invention: the cross-sectional shape of the installation guide is "L"-shaped, and the installation guide is slidably connected to the movable installation plate.

[0016] As a further solution of the present invention: a mounting slot is provided at the bottom of one side of the extrusion rod, and a rotating roller is installed inside the mounting slot.

[0017] As a further solution of the present invention: the conveying mechanism includes a second servo motor, which is installed on one side of the outer wall of the sand, gravel and stone powder mixture conveying pipe, and the output end of the second servo motor is connected to a rotating conveying roller, and the rotating conveying roller passes through the sand, gravel and stone powder mixture conveying pipe, and a second accommodating transfer trough is opened at one end of the outer wall of the rotating conveying roller.

[0018] As a further solution of the present invention: the movable mechanism comprises a rotating connecting ring, the rotating connecting ring is arranged inside the annular groove, and closed scraping brush blocks are installed at both ends of the outer wall of the rotating connecting ring.

[0019] As a further solution of the present invention: the central axis of the closed scraping and brushing block coincides with the central axis of the movable conveying roller, and the closed scraping and brushing block is rotatably connected to the movable conveying roller.

[0020] As a further solution of the present invention: an automatic control system for stone powder content in machine-made sand includes the following components:

[0021] Stone powder content detection system, which is used to detect the stone powder content in the raw materials of a specified production batch;

[0022] Raw material conveying system, which is used to uniformly convey the crushed sand and stone powder mixed raw materials;

[0023] Stone powder removal system, which is used to extract and collect excess stone powder in the raw materials being transported through negative pressure airflow;

[0024] Among them, the negative pressure extraction equipment is of adjustable speed type. The size of the negative pressure extraction force is achieved through the speed regulation of the equipment. When the negative pressure is large, larger particles of stone powder can be extracted, and the amount of stone powder extracted is more. When the negative pressure is small, the amount of stone powder extracted is lower, so as to adjust the stone powder content in the raw material.

[0025] The classification discharge system is used to discharge the sand and gravel parts and stone powder removed from the stone powder separately, and then collect them separately.

[0026] Beneficial effects of the present invention:

[0027] (1) The present invention allows the raw materials to intermittently enter the stone powder removal treatment pipe and intermittently discharge from the stone powder removal treatment pipe through the continuous rotation of the movable conveying roller and the rotating conveying roller, so that the raw materials can stay in the stone powder removal treatment pipe for a period of time, and then the negative pressure from the negative pressure supply filter pipe can more fully extract and remove the stone powder of a specified particle size in the raw materials in the stone powder removal treatment pipe;

[0028] (2) The present invention provides an extrusion rod on the movable conveying roller, an arc-shaped extrusion limiting block on the fixed mounting ring, and the movable conveying roller can move up and down in the strip-shaped guide hole, so that the movable conveying roller will jump during the rotation process, and the raw material in the stone powder removal treatment tube can be thrown up once, and further ensure that the negative pressure can more fully extract and remove the stone powder of a specified particle size in the raw material on the basis of the above;

[0029] (3) The present invention provides a rotating connecting ring and a closed scraping block on the movable conveying roller, so that when the movable conveying roller is jumping, the closed scraping block can scrape and clean the filtering parts of the negative pressure supply filter tube and the filter air inlet pipe, thereby preventing some stone powder from easily adhering thereto and affecting the normal passage of the airflow, thereby ensuring the continuous working effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] Figure 1 It is a main structural schematic diagram of the present invention;

[0032] Figure 2 It is a schematic diagram of the main cross-sectional structure of the present invention;

[0033] Figure 3 The present invention Figure 2 A magnified schematic diagram of point A;

[0034] Figure 4 It is a side cross-sectional structural schematic diagram of the present invention;

[0035] Figure 5 It is a schematic diagram of the main structure of the movable conveying roller in the present invention;

[0036] Figure 6 It is a schematic diagram of the main structure of the rotating connecting ring in the present invention;

[0037] Figure 7 It is a schematic diagram of the main structure of the fixed installation ring in the present invention.

[0038] In the figure: 1. Sand, gravel and stone powder mixture conveying pipe; 2. Stone powder removal treatment pipe; 3. Negative pressure supply filter pipe; 4. Filter air inlet pipe; 5. Strip guide hole; 6. Movable conveying roller; 7. First accommodating transfer trough; 8. Mounting guide; 9. Movable mounting plate; 10. Spring; 11. First servo motor; 12. Fixed mounting ring; 13. Arc-shaped extrusion limiting block; 14. Extrusion rod; 15. Mounting slot; 16. Rotating roller; 17. Second servo motor; 18. Rotating conveying roller; 19. Second accommodating transfer trough; 20. Annular groove; 21. Rotating connecting ring; 22. Closed scraping brush block. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Embodiment 1:

[0041] See also Figure 1 , Figure 2 and Figure 3 As shown, an automatic control device for stone powder content in machine-made sand comprises a sand-stone-stone powder mixture conveying pipe 1, the bottom of the sand-stone-stone powder mixture conveying pipe 1 is connected to a stone powder removal processing pipe 2, one end of the outer wall of the stone powder removal processing pipe 2 is connected to a negative pressure supply filter pipe 3, and the other end of the outer wall of the stone powder removal processing pipe 2 is connected to a filter air intake pipe 4;

[0042] The sand, gravel and stone powder mixture conveying pipe 1 is connected to the conveying and discharging part of the machine-made sand equipment, the negative pressure supply filter pipe 3 is connected to the negative pressure extraction equipment, and a stone powder collection and storage part is arranged between the negative pressure supply filter pipe 3 and the negative pressure extraction equipment, the filter air inlet pipe 4 is connected to a space suitable for extracting external air, and the stone powder removal processing pipe 2 is connected to the sand and gravel discharge collection part.

[0043] The negative pressure supply filter tube 3 and the filter air inlet tube 4 are both inclined, and the filter hole diameter on the negative pressure supply filter tube 3 is larger than the filter hole diameter on the filter air inlet tube 4;

[0044] The filter holes on the negative pressure supply filter tube 3 are large enough to pass the stone powder particles to be removed, and the filter holes on the filter air inlet pipe 4 can pass air normally but cannot pass the stone powder particles.

[0045] Both sides of the stone powder removal processing tube 2 are provided with strip guide holes 5, and movable conveying rollers 6 are arranged inside the strip guide holes 5, and a first accommodating transfer groove 7 is provided at one end of the outer wall of the movable conveying roller 6, and the central axis of the movable conveying roller 6 is parallel to the transverse central axis of the stone powder removal processing tube 2, and the movable conveying roller 6 can move in the strip guide hole 5;

[0046] Under the action of the corresponding external force, the movable conveying roller 6 can rotate, and when the movable conveying roller 6 rotates, the first receiving and transferring trough 7 thereon can continuously make circular motion, and when the first receiving and transferring trough 7 is facing upward under the rotation of the movable conveying roller 6, the raw materials in the stone powder removal processing tube 2 can enter it, and when the first receiving and transferring trough 7 is facing downward under the rotation of the movable conveying roller 6, the raw materials in the first receiving and transferring trough 7 are further discharged. In this process, the raw materials will remain inside the stone powder removal processing tube 2 for a period of time, so that the negative pressure supply filter tube 3 can more fully extract the stone powder of corresponding particle size in this part of the raw materials.

[0047] The stone powder removal processing pipe 2 is provided with a driving mechanism for driving the movable conveying roller 6 to move, and the driving mechanism includes a mounting guide 8, the mounting guide 8 is installed on one side of the sand and stone powder mixture conveying pipe 1, a movable mounting plate 9 is provided inside the mounting guide 8, and a spring 10 is connected between the movable mounting plate 9 and the mounting guide 8, and a first servo motor 11 is installed on one side of the movable mounting plate 9 close to the stone powder removal processing pipe 2, and the output end of the first servo motor 11 is connected to the movable conveying roller 6;

[0048] The first servo motor 11 can drive the movable conveying roller 6 to rotate continuously, thereby completing the above-mentioned operation of driving the first receiving transfer groove 7 to continuously perform circular motion.

[0049] The sand, gravel and stone powder mixture conveying pipe 1 is provided with a conveying mechanism for intermittently closing itself, and the conveying mechanism includes a second servo motor 17, which is installed on one side of the outer wall of the sand, gravel and stone powder mixture conveying pipe 1, and the output end of the second servo motor 17 is connected to a rotating conveying roller 18, and the rotating conveying roller 18 passes through the sand, gravel and stone powder mixture conveying pipe 1, and one end of the outer wall of the rotating conveying roller 18 is provided with a second accommodating transfer groove 19;

[0050] The second servo motor 17 can drive the rotating conveying roller 18 to continuously rotate in the sand, gravel and stone powder mixture conveying pipe 1. Similar to the movable conveying roller 6 and the first receiving transfer trough 7, the rotating conveying roller 18 can drive the second receiving transfer trough 19 to continuously perform circular motion during the continuous rotation, so that the raw materials from the top of the sand, gravel and stone powder mixture conveying pipe 1 can intermittently pass through the second receiving transfer trough 19 into the stone powder removal processing pipe 2, and the sand, gravel and stone powder mixture conveying pipe 1 and the stone powder removal processing pipe 2 are in a closed state during the rest of the time, thereby cooperating to complete the negative pressure supply filter tube 3 to more fully extract the stone powder of specified particle size in this part of the raw materials in the stone powder removal processing pipe 2.

[0051] It should be noted that the movable conveying roller 6 and the rotating conveying roller 18 rotate synchronously, and at the same time, the direction of the first receiving transfer trough 7 driven by the movable conveying roller 6 and the direction of the second receiving transfer trough 19 driven by the rotating conveying roller 18 remain the same, so that the movable conveying roller 6 and the rotating conveying roller 18 always remain in a closed state, and then the negative pressure supply filter tube 3 can be cooperated to complete the task of removing stone powder from the raw materials in batches, avoiding the situation where the raw materials are mixed and interfered with each other.

[0052] An automatic control system for stone powder content in machine-made sand includes the following components:

[0053] S1, stone powder content detection system, which is used to detect the stone powder content in the raw materials of a specified production batch;

[0054] S2, raw material conveying system, which is used to uniformly convey the crushed sand and stone powder mixed raw materials;

[0055] S3, stone powder removal system, which is used to extract and collect excess stone powder in the raw materials being transported through negative pressure airflow;

[0056] Among them, the negative pressure extraction equipment is of adjustable speed type. The size of the negative pressure extraction force is achieved through the speed regulation of the equipment. When the negative pressure is large, larger particles of stone powder can be extracted, and the amount of stone powder extracted is more. When the negative pressure is small, the amount of stone powder extracted is lower, so as to adjust the stone powder content in the raw material.

[0057] S4, classification discharge system, this system is used to independently discharge the sand and gravel parts and stone powder after the stone powder is removed, and then collect them independently.

[0058] Example 2

[0059] Based on the above embodiment 1, refer to Figure 1-Figure 5 As shown, a fixed mounting ring 12 is installed on one side of the stone powder removal processing tube 2, and an arc-shaped extrusion limiting block 13 is installed on the inner side wall of the fixed mounting ring 12, and an extrusion rod 14 is installed on the outer side of the movable conveying roller 6 near one end of the fixed mounting ring 12;

[0060] The central axis of the movable conveying roller 6 is parallel to the transverse central axis of the stone powder removal processing tube 2, and the movable conveying roller 6 can move in the strip guide hole 5;

[0061] The cross-sectional shape of the installation guide 8 is "L"-shaped, and the installation guide 8 is slidably connected to the movable installation plate 9;

[0062] When the first servo motor 11 drives the movable conveying roller 6 to rotate, the extrusion rod 14 will be mutually squeezed with the arc-shaped extrusion limiting block 13 for a period of time. During this process, the movable conveying roller 6 will have a short upward movement. At the same time, during this movement, the movable conveying roller 6 can be guided to slide in the strip guide hole 5, and the movable mounting plate 9 can slide in the mounting guide 8. The spring 10 undergoes corresponding deformation, which will not hinder the movable conveying roller 6 from performing this movement. At the same time, the movable conveying roller 6 is guided. This action can throw the raw materials on the movable conveying roller 6 upward, thereby avoiding the rapid accumulation of the raw materials, resulting in some of the particles that meet the particle size of the extracted stone powder being accumulated in the sand and gravel and cannot be extracted, thereby further ensuring the extraction and removal effect;

[0063] A mounting slot 15 is provided at the bottom of one side of the extrusion rod 14, and a rotating roller 16 is installed inside the mounting slot 15. The rotating roller 16 is composed of a set of fixed shafts and a roller part arranged outside the fixed shaft, so that the rotating roller 16 can replace the extrusion rod 14 to extrude with the arc-shaped extrusion limiting block 13 and move on the arc-shaped extrusion limiting block 13. During the extrusion movement process, the rotating roller 16 can rotate accordingly, thereby reducing wear.

[0064] It should be noted that the movable conveying roller 6 and the rotating conveying roller 18 both rotate clockwise. When the movable conveying roller 6 rotates and drives the first receiving transfer trough 7 toward one end of the filtering air inlet pipe 4, the extrusion rod 14 begins to be squeezed with the arc-shaped extrusion limiting block 13. At this time, the first receiving transfer trough 7 and the second receiving transfer trough 19 are not connected to the stone powder removal processing pipe 2. Therefore, the brief upward movement of the movable conveying roller 6 at this time will not be affected by the up and down conveying process of the raw materials, and will only throw the existing raw materials between the movable conveying roller 6 and the rotating conveying roller 18 upward.

[0065] Example 3

[0066] Based on the above embodiment 1, refer to Figure 2 , Figure 4 , Figure 6 and Figure 7 As shown, both ends of the movable conveying roller 6 are provided with an annular groove 20, and a movable mechanism for scraping the negative pressure supply filter tube 3 and the filter air intake tube 4 is arranged inside the annular groove 20. The movable mechanism includes a rotating connecting ring 21, which is arranged inside the annular groove 20, and both ends of the outer wall of the rotating connecting ring 21 are installed with closed scraping blocks 22;

[0067] The central axis of the closed scraping and brushing block 22 coincides with the central axis of the movable conveying roller 6, and the closed scraping and brushing block 22 and the movable conveying roller 6 are rotatably connected;

[0068] Furthermore, the rotating connecting ring 21 is not connected to the stone powder removal processing tube 2, so that when the rotating connecting ring 21 rotates in the annular groove 20, it will not interfere with the inner wall of the stone powder removal processing tube 2, and the closed scraping brush block 22 and the stone powder removal processing tube 2 maintain relative sliding, and the closed scraping brush block 22 is not connected to the movable conveying roller 6, so that the closed scraping brush block 22 will not affect the normal rotation of the movable conveying roller 6;

[0069] The part composed of the rotating connecting ring 21 and the closed scraping brush block 22 can only move up and down in the stone powder removal treatment tube 2, and rotate relative to the movable conveying roller 6, so as not to hinder the normal rotation of the movable conveying roller 6. At the same time, when the movable conveying roller 6 briefly jumps up and down, the rotating connecting ring 21 and the closed scraping brush block 22 will follow the movable conveying roller 6 to implement the up and down jumping process. During this process, the closed scraping brush block 22 will scrape and clean the filtering part of the negative pressure supply filter tube 3 and the filter air intake pipe 4 to prevent some raw materials with high water content from adhering to them and affecting the normal passage of subsequent airflow.

[0070] It should be noted that the speed of the short jumping process of the movable conveying roller 6 is greater than the falling rate of the thrown raw material, so that the filtering surface of the negative pressure supply filter tube 3 and the filter air inlet pipe 4 will not be completely blocked in this process, thereby ensuring that the task of extracting stone powder from the thrown raw material can be completed through the negative pressure supply filter tube 3 and the filter air inlet pipe 4.

[0071] The working principle of the present invention is as follows: the conveying pipe 1 of the sand and stone powder mixture is connected with the conveying and discharging part of the machine-made sand equipment, the negative pressure supply filter pipe 3 is connected with the negative pressure extraction equipment, and a stone powder collection and storage part is connected between the negative pressure supply filter pipe 3 and the negative pressure extraction equipment, the filter air intake pipe 4 is connected with a space suitable for extracting external air, and the stone powder removal treatment pipe 2 is connected with the sand and stone discharge collection part. Samples are taken from the machine-made sand equipment in operation, and the contents of sand and stone powder generated by the crushed raw materials of the equipment and the contents of stone powder of different particle sizes are analyzed according to the samples. Then, the negative pressure supply size of the negative pressure extraction equipment connected with the negative pressure supply filter pipe 3 is adjusted according to the required stone powder content, and the filter plate on the negative pressure supply filter pipe 3 is replaced at the same time, so that the filter holes of the filter plate on the negative pressure supply filter pipe 3 allow stone powder of some particle sizes to pass through, and the ratio of the remaining sand and stone powder meets the requirements;

[0072] Then the raw material enters the stone powder removal processing tube 2 at a uniform speed, and by adjusting the raw material entry rate or the rotation rate of the movable conveying roller 6 and the rotating conveying roller 18, the raw material entry rate is made to be the same as the raw material conveying rate of the rotating conveying roller 18 and the movable conveying roller 6, and the second servo motor 17 drives the rotating conveying roller 18 to rotate continuously. As mentioned above, with the cooperation of the second accommodating transfer trough 19, the raw material intermittently enters the stone powder removal processing tube 2, and stays in the stone powder removal processing tube 2 for a period of time under the closure of the stone powder removal processing tube 2 by the movable conveying roller 6. During this process, external air enters the stone powder removal processing tube 2 through the filter air intake pipe 4, and is discharged through the negative pressure supply filter tube 3. During this process, the stone powder that can pass through the filter holes on the negative pressure supply filter tube 3 is basically separated out through the negative pressure supply filter tube 3, and this part of the stone powder then enters the negative pressure supply filter tube 3 and is connected to the negative pressure extraction device to set a stone powder collection and storage part;

[0073] In the above process, as mentioned above, when the movable conveying roller 6 rotates to the first receiving transfer trough 7 on it toward the filter air inlet pipe 4, the movable conveying roller 6 will move up and down briefly, and then cooperate with the closed scraping and brushing block 22 to throw the raw materials on it again, so that the stone powder in the raw materials that can pass through the filter holes on the negative pressure supply filter tube 3 can be fully extracted under the action of negative pressure, and in this process, the closed scraping and brushing block 22 can scrape and clean the filtering parts on the negative pressure supply filter tube 3 and the filter air inlet pipe 4, so as to avoid a small amount of sand and gravel with high water content adhering to the filtering parts on the negative pressure supply filter tube 3 or the filter air inlet pipe 4 to affect the normal circulation of the airflow, thereby ensuring the continuous operation effect of the entire device;

[0074] Subsequently, under the rotation of the movable conveying roller 6 and the cooperation of the first accommodating transfer trough 7, the sand and gravel with the stone powder of the specified particle size removed and the remaining stone powder inside the stone powder removal processing pipe 2 enter the sand and gravel discharge collection part connected to the stone powder removal processing pipe 2.

[0075] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An automatic control device for the stone powder content in machine-made sand, comprising a sand, gravel and stone powder mixture conveying pipe (1), characterized in that: The bottom of the sand, gravel and stone powder mixture conveying pipe (1) is connected to a stone powder removal processing pipe (2), one end of the outer wall of the stone powder removal processing pipe (2) is connected to a negative pressure supply filter pipe (3), and the other end of the outer wall of the stone powder removal processing pipe (2) is connected to a filter air intake pipe (4); Both sides of the stone powder removal treatment tube (2) are provided with strip guide holes (5), and movable conveying rollers (6) are arranged inside the strip guide holes (5), and a first accommodating transfer groove (7) is provided at one end of the outer wall of the movable conveying roller (6); The stone powder removal treatment pipe (2) is provided with a driving mechanism for driving the movable conveying roller (6) to move; A fixed mounting ring (12) is installed on one side of the stone powder removal treatment tube (2), and an arc-shaped extrusion limiting block (13) is installed on the inner side wall of the fixed mounting ring (12), and an extrusion rod (14) is installed on the outer side of one end of the movable conveying roller (6) close to the fixed mounting ring (12); The sand, gravel and stone powder mixture conveying pipe (1) is provided with a conveying mechanism for intermittently sealing the conveying pipe; Both ends of the movable conveying roller (6) are provided with an annular groove (20), and a movable mechanism for scraping the negative pressure supply filter tube (3) and the filter air intake tube (4) is arranged inside the annular groove (20).

2. The automatic control device for stone powder content in machine-made sand according to claim 1 is characterized in that: The negative pressure supply filter tube (3) and the filter air intake tube (4) are both arranged at an inclination, and the filter holes on the negative pressure supply filter tube (3) have a larger aperture than the filter holes on the filter air intake tube (4).

3. The automatic control device for stone powder content in machine-made sand according to claim 1 is characterized in that: The central axis of the movable conveying roller (6) is parallel to the transverse central axis of the stone powder removal processing tube (2), and the movable conveying roller (6) can move in the strip guide hole (5).

4. The automatic control device for stone powder content in machine-made sand according to claim 1 is characterized in that: The driving mechanism comprises a mounting guide (8), wherein the mounting guide (8) is mounted on one side of a sandstone and stone powder mixture conveying pipe (1), a movable mounting plate (9) is arranged inside the mounting guide (8), and a spring (10) is connected between the movable mounting plate (9) and the mounting guide (8), and a first servo motor (11) is mounted on a side of the movable mounting plate (9) close to the stone powder removal processing pipe (2), and an output end of the first servo motor (11) is connected to a movable conveying roller (6).

5. The automatic control device for stone powder content in machine-made sand according to claim 4 is characterized in that: The cross-sectional shape of the installation guide (8) is "L"-shaped, and the installation guide (8) is slidably connected to the movable installation plate (9).

6. The automatic control device for stone powder content in machine-made sand according to claim 1 is characterized in that: A mounting slot (15) is provided at the bottom of one side of the extrusion rod (14), and a rotating roller (16) is installed inside the mounting slot (15).

7. The automatic control device for stone powder content in machine-made sand according to claim 1 is characterized in that: The conveying mechanism comprises a second servo motor (17), the second servo motor (17) being mounted on one side of the outer wall of the sand, gravel and stone powder mixture conveying pipe (1), the output end of the second servo motor (17) being connected to a rotating conveying roller (18), and the rotating conveying roller (18) passing through the sand, gravel and stone powder mixture conveying pipe (1), and a second accommodating transfer groove (19) being provided at one end of the outer wall of the rotating conveying roller (18).

8. The automatic control device for stone powder content in machine-made sand according to claim 1 is characterized in that: The movable mechanism comprises a rotating connecting ring (21), the rotating connecting ring (21) is arranged inside the annular groove (20), and closed scraping blocks (22) are installed at both ends of the outer wall of the rotating connecting ring (21).

9. The automatic control device for stone powder content in machine-made sand according to claim 8, characterized in that: The central axis of the closed scraping and brushing block (22) coincides with the central axis of the movable conveying roller (6), and the closed scraping and brushing block (22) and the movable conveying roller (6) are rotatably connected.

10. An automatic control system for stone powder content in machine-made sand, characterized by: It includes the following components: Stone powder content detection system, which is used to detect the stone powder content in the raw materials of a specified production batch; Raw material conveying system, which is used to uniformly convey the crushed sand and stone powder mixed raw materials; Stone powder removal system, which is used to extract and collect excess stone powder in the raw materials being transported through negative pressure airflow; Among them, the negative pressure extraction equipment is of adjustable speed type. The size of the negative pressure extraction force is achieved through the speed regulation of the equipment. When the negative pressure is large, larger particles of stone powder can be extracted, and the amount of stone powder extracted is more. When the negative pressure is small, the amount of stone powder extracted is lower, so as to adjust the stone powder content in the raw material. The classification discharge system is used to discharge the sand and gravel parts and stone powder removed from the stone powder separately, and then collect them separately.

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