Bulk material metering scale with material discharge dust suppression function and dust removal control method thereof

Abstract

This invention relates to a bulk material weighing scale with a discharge dust suppression function and its dust control method. The bulk material weighing scale with a discharge dust suppression function includes a scale body, and a discharge dust suppression device is installed at the outlet of the scale body. The structure of the discharge dust suppression device includes a funnel-shaped discharge buffer hopper, the large opening of which is connected to the outlet of the scale body, and a discharge pipe connected to the small opening of the discharge buffer hopper. A conical plug is installed inside the discharge buffer hopper, and a sleeve is concentrically installed outside the discharge pipe. A circular dust removal gap is formed between the inner wall of the sleeve and the outer wall of the discharge pipe. A dust removal port is opened above the side wall of the sleeve. By setting up the discharge dust suppression device, the amount of dust generated during material discharge can be reduced, and dust can be removed, thereby greatly avoiding dust pollution at the loading site. It has low installation requirements and low manufacturing cost.

Description

Technical Field

[0001] This invention relates to the field of automatic quantitative weighing technology, and in particular to a bulk material weighing scale with material discharge and dust suppression function and its dust control method. Background Technology

[0002] A bulk material weighing scale is an automated device used to weigh bulk materials. It automatically controls the loading process based on preset weight parameters, ensuring accurate weight measurement. In the large-scale centralized transportation of agricultural products, primarily grains (such as soybeans, corn, rice, wheat, barley, millet, and miscellaneous grains), feed ingredients (such as soybean meal, rapeseed meal, corn distillers grains, peanut meal, and rapeseed meal), finished feed products, and feed additives, the materials are transferred to the transport vehicle using a bulk material weighing scale, thus obtaining the weight of the materials loaded on the transport vehicle.

[0003] Because the bulk material weighing scale is installed at a high position above the transport vehicle, the material discharged from the scale falls naturally, dropping 3-4 meters into the cargo hold of the transport vehicle. Since the material inevitably contains dust, a large amount of dust escapes and disperses during this process, resulting in severe dust pollution at the loading site.

[0004] In related technologies, in order to solve the problem of serious dust pollution at the loading site, telescopic chutes and loading chutes are often connected to the discharge port of the bulk material weighing scale to guide the material discharge, or the installation height of the bulk material weighing scale is directly reduced. The aforementioned methods all reduce the height of the material falling in the air, so that after the material comes out of the discharge port of the bulk material weighing scale, it enters the cargo warehouse as soon as possible, reducing the time of falling in the air, thereby reducing the escape of dust.

[0005] However, adding components such as chutes will inevitably increase production costs and increase the complexity of equipment operation at the loading site. In addition, many loading sites are limited by the actual site conditions, and the installation height of bulk material weighing scales cannot be lowered or can only be adjusted within a small range, thus making it impossible to implement the solutions in the relevant technologies, and a new solution is urgently needed. Summary of the Invention

[0006] In response to the shortcomings of the existing production technology, the applicant provides a bulk material weighing scale with discharge dust suppression function and its dust control method. By setting up a discharge dust suppression device, the amount of dust generated when the material is discharged can be reduced, and the dust can be sucked away, thereby greatly avoiding dust pollution at the loading site. It has low requirements for installation conditions and low manufacturing cost.

[0007] The technical solution adopted in this invention is as follows:

[0008] A bulk material weighing scale with a material discharge and dust suppression function includes a bulk material weighing scale body, and a material discharge and dust suppression device is installed at the discharge port of the bulk material weighing scale body.

[0009] The structure of the discharge dust suppression device is as follows: it includes a funnel-shaped discharge buffer hopper, the large opening of which is connected to the discharge port of the bulk material weighing scale body, and a discharge pipe connected to the small opening of which is fitted with a discharge pipe. A conical plug is fitted inside the discharge buffer hopper, and a discharge gap is formed between the outer wall of the conical plug and the inner wall of the discharge buffer hopper. A sleeve is concentrically installed outside the discharge pipe, and an annular dust removal gap is formed between the inner wall of the sleeve and the outer wall of the discharge pipe. The axial length of the sleeve is greater than the axial length of the discharge pipe, and a dust removal port is opened above the side wall of the sleeve.

[0010] The material enters the discharge buffer hopper from the discharge port of the bulk material weighing scale body. The conical plug guides the material to fall into the discharge pipe through the discharge gap. The dust generated during the material's fall in the discharge pipe is dispersed into the dust removal gap and discharged through the dust removal port.

[0011] As a further improvement to the above technical solution:

[0012] The conical plug is arranged concentrically with the discharge port of the bulk material weighing scale body.

[0013] The structure of the conical plug is as follows: it includes a conical plug body, the conical plug body includes a conical part in the shape of a cone, the side wall surface of the conical part forms a first inclined surface, and a frustum part in the shape of an inverted frustum is concentrically provided at the bottom of the conical part, the side wall surface of the frustum part forms a second inclined surface;

[0014] The first inclined plane guides the material to fall in an orderly manner.

[0015] The second inclined surface forms a discharge gap with the discharge buffer hopper. The inclination angle of the second inclined surface is not equal to the inclination angle of the side wall of the discharge buffer hopper, so that the radial width of the discharge gap decreases along the direction of material falling.

[0016] The inner diameter of the discharge pipe is equal to the inner diameter of the small opening of the discharge buffer hopper.

[0017] The axial length of the sleeve is 350mm-450mm longer than the axial length of the discharge pipe.

[0018] The radial width of the dust removal gap is 50mm-80mm.

[0019] Both the discharge pipe and the sleeve are hollow cylindrical.

[0020] The structure of the bulk material weighing scale body is as follows: it includes an outer shell, an inlet at the top of the outer shell, an outlet at the bottom of the outer shell, a weighing cylinder installed inside the outer shell, and a dust discharge port at the bottom of the side wall of the outer shell.

[0021] A feed pipe is installed inside the feed inlet, and a first valve is installed on the feed pipe. The feed pipe is connected to the feed inlet of the metering cylinder.

[0022] A second valve is installed at the discharge end of the metering cylinder;

[0023] When the first valve is opened, the material enters the metering cylinder through the feed pipe. After the metering cylinder weighs and measures the material inside, the second valve is opened, and the material is discharged from the metering cylinder.

[0024] A dust control method for a bulk material metering scale with discharge dust suppression function, wherein a material level sensor is installed above the side wall of the discharge buffer hopper, and the material level sensor detects the material level in the discharge buffer hopper.

[0025] The bulk material weighing scale is equipped with a weighing control box inside its main body;

[0026] A first control valve is installed inside the dust discharge port of the bulk material weighing scale body, and a second control valve is installed inside the dust removal port of the sleeve tube.

[0027] The level sensor, the first control valve, and the second control valve are all electrically connected to the weighing control box.

[0028] The weighing control box can control the dust removal air volume according to the signal from the level sensor. The dust removal air volume control includes the following steps:

[0029] S1. According to the set interval time, the level sensor sends the material level signal in the discharge buffer hopper to the weighing control box;

[0030] S2. When the material level in the discharge buffer hopper is higher than the level sensor, the level sensor sends a "full" signal to the weighing control box. Then the weighing control box controls the first control valve to close 30%-80% and the second control valve to close 30%-80%, thereby reducing the air volume at the dust discharge port and the dust removal port.

[0031] S3. When the material level in the discharge buffer hopper is lower than the level sensor for the first time, the level sensor sends a "first empty material" signal to the weighing control box. Then the weighing control box controls the first control valve to open 60%-80% and the second control valve to open 60%-80%, thereby increasing the air volume at the dust discharge port and the dust removal port.

[0032] S4. When the material level in the discharge buffer hopper is continuously lower than the level sensor, the level sensor sends a "continuous empty material" signal to the weighing control box. Subsequently, the weighing control box controls the first control valve to fully open and the second control valve to fully open, thereby maximizing the airflow at the dust discharge port and the dust removal port.

[0033] The beneficial effects of this invention are as follows:

[0034] This invention features a compact and reasonable structure and is easy to operate. By setting up a material discharge dust suppression device, it can replace the original discharge device of the bulk material weighing scale without the need for complex operations such as reinstallation or relocation of the equipment. It can reduce or suppress dust overflow and escape from the source, thereby allowing the bulk material weighing scale to be installed at any height, minimizing the installation restrictions at the loading site, and enabling loading of vehicles and cargo ships of all tonnages.

[0035] The bulk material weighing scale of the present invention can discharge materials downward from a high installation position. Unlike the prior art, which focuses on reducing the residence time of materials in the air during discharge, the present invention does not limit the height of the discharge port of the bulk material weighing scale from trucks and cargo ships, thus not limiting the height and size of the transport vehicles used for loading, and is highly flexible in use.

[0036] This invention, by setting up a dust discharge port, can suck away the dust generated by the material in the discharge buffer hopper, and by setting up a dust removal port, can suck away the dust in the sleeve tube. While suppressing dust dispersion, it also sucks away and removes most of the dust, so that no matter how high the material falls into the warehouse, no dust will be generated or escape during the falling process.

[0037] In this invention, by setting a conical plug, the first inclined surface of the plug can guide the material to fall in an orderly manner, which can effectively prevent dust from being stirred up by the material. The second inclined surface of the plug and the discharge buffer hopper form a discharge gap, which can squeeze the material and further prevent dust from escaping into the external environment when the material is discharged.

[0038] In this invention, by setting up a sleeve tube and opening a dust removal port on the sleeve tube, the dust inside the sleeve tube can be sucked away; by setting up a discharge pipe, a dust removal gap can be formed between the discharge pipe and the sleeve tube, which can ensure that when the dust removal port sucks air, it only sucks away the escaped dust and does not suck away the material, thus protecting the material.

[0039] The dust removal control method of the present invention allows the weighing control box to intelligently control the opening degree of the first control valve and the second control valve through the signal of the material level sensor, thereby controlling the amount of air suction, dynamically controlling the dust removal effect, and optimally matching the amount of material in the discharge buffer hopper. Attached Figure Description

[0040] Figure 1This is the control flowchart of the present invention.

[0041] Figure 2 This is a schematic diagram of the structure of the present invention.

[0042] Figure 3 This is a schematic diagram of the material discharge dust suppression device in this invention.

[0043] Figure 4 This is a schematic diagram of the conical plug in this invention.

[0044] Figure 5 This is a schematic diagram of the installation structure of the discharge pipe and the sleeve pipe in this invention.

[0045] The components include: 1. Bulk material weighing scale body; 2. Discharge buffer hopper; 3. Conical plug; 4. Discharge pipe; 5. Sleeve pipe; 6. Dust removal port; 7. Material level indicator; 8. Discharge gap; 9. Dust removal gap;

[0046] 101. Outer casing; 102. Measuring cylinder; 103. Weighing control box; 104. Feed pipe; 105. First valve; 106. Second valve; 107. Dust outlet;

[0047] 301. Conical plug body; 302. First inclined surface; 303. Second inclined surface. Detailed Implementation

[0048] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0049] Since the materials handled by bulk material weighing scales inevitably contain dust, a large amount of dust will escape and disperse with the materials during the loading process, resulting in serious dust pollution at the loading site. At the same time, due to the site requirements, it is impossible to reduce dust dispersion by increasing the chute or lowering the installation height of the bulk material weighing scale. Therefore, a new device and method are urgently needed.

[0050] like Figures 1-5As shown, the bulk material weighing scale with discharge dust suppression function in this embodiment includes a bulk material weighing scale body 1, and a discharge dust suppression device is installed at the discharge port of the bulk material weighing scale body 1. The structure of the discharge dust suppression device is as follows: it includes a funnel-shaped discharge buffer hopper 2, the large opening of the discharge buffer hopper 2 is connected to the discharge port of the bulk material weighing scale body 1, the small opening of the discharge buffer hopper 2 is connected to the discharge pipe 4, a conical plug 3 is installed inside the discharge buffer hopper 2, and a discharge gap 8 is formed between the outer wall of the conical plug 3 and the inner wall of the discharge buffer hopper 2. A sleeve tube 5 is concentrically installed on the outside of the 4. A circular dust removal gap 9 is formed between the inner wall of the sleeve tube 5 and the outer wall of the discharge pipe 4. The axial length of the sleeve tube 5 is greater than the axial length of the discharge pipe 4. A dust removal port 6 is opened above the side wall of the sleeve tube 5. The material enters the discharge buffer hopper 2 from the discharge port of the bulk material weighing scale body 1. The conical plug 3 guides the material to fall into the discharge pipe 4 through the discharge gap 8. The dust generated during the falling of the material in the discharge pipe 4 is dispersed into the dust removal gap 9 and discharged through the dust removal port 6.

[0051] The structure of the bulk material weighing scale body 1 is as follows: it includes an outer shell 101, with a feed inlet at the top and a discharge outlet at the bottom. A weighing cylinder 102 is installed inside the outer shell 101, and a dust discharge port 107 is located below the side wall of the outer shell 101. A feed pipe 104 is installed inside the feed inlet, and a first valve 105 is installed on the feed pipe 104. The feed pipe 104 is connected to the inlet end of the weighing cylinder 102. A second valve 106 is installed at the outlet end of the weighing cylinder 102. When the first valve 105 is opened, the material enters the weighing cylinder 102 through the feed pipe 104. After the weighing cylinder 102 weighs the material inside, the second valve 106 is opened, and the material is discharged from the weighing cylinder 102.

[0052] The materials used in this invention include agricultural products, mainly grains, feed ingredients, finished feed products, and feed additives, all of which contain dust. When the dust is mixed with the finished product and the material is in a static state, the dust adheres to the surface and does not generate dust. However, during weighing on the bulk material weighing scale, the material enters the weighing cylinder 102. After weighing, the second valve 106 opens, and the material in the weighing cylinder 102 falls freely into the discharge buffer hopper 2. At this time, the material is agitated a second time, causing the dust to be released, thus generating dust.

[0053] In this invention, by setting up a material discharge dust suppression device and a dust discharge port 107, dust generation can be reduced and the generated dust can be sucked away, thereby avoiding dust pollution at the loading site.

[0054] The specific structure and function of this embodiment are as follows:

[0055] The bulk material weighing scale with discharge dust suppression function in this embodiment includes a bulk material weighing scale body 1 and a discharge dust suppression device.

[0056] The bulk material weighing scale body 1 is used to weigh materials. The discharge dust suppression device is installed at the discharge port of the outer shell 101 of the bulk material weighing scale body 1. The discharge dust suppression device can prevent the dust contained in the material from being stirred up. At the same time, it can suck away and remove the dust that escapes from the material, thereby preventing the dust from escaping into the external environment when the material is discharged.

[0057] The material discharge dust suppression device includes a material discharge buffer hopper 2, a conical plug 3, a material discharge pipe 4, and a sleeve pipe 5; among which,

[0058] The discharge buffer hopper 2 is a hollow hopper used to fully receive one unit weight of material after the weighing cylinder 102 has been weighed, so that all the material in the weighing cylinder 102 can be discharged.

[0059] The conical plug 3 is fixed inside the discharge buffer hopper 2, specifically, it can be fixed by a support frame; the conical plug 3 is arranged concentrically with the discharge port of the bulk material weighing scale body 1.

[0060] like Figure 4 As shown, the structure of the conical plug 3 is as follows: it includes a conical plug body 301, the conical plug body 301 includes a conical part in the shape of a cone, the side wall surface of the conical part forms a first inclined surface 302, and a frustum part in the shape of an inverted frustum is concentrically provided at the bottom of the conical part, the side wall surface of the frustum part forms a second inclined surface 303; the first inclined surface 302 guides the material to fall in an orderly manner;

[0061] The second inclined surface 303 forms a discharge gap 8 with the discharge buffer hopper 2. The inclination angle of the second inclined surface 303 is not equal to the inclination angle of the side wall of the discharge buffer hopper 2, so that the radial width of the discharge gap 8 decreases along the material falling direction.

[0062] When the metering cylinder 102 discharges material, the material slides down through the first inclined surface 302 of the conical plug 3. The first inclined surface 302 can guide the material to fall in an orderly manner, which can avoid the material falling in a disorderly manner and generate a lot of dust, thereby reducing the amount of dust generated during the material falling.

[0063] The discharge gap 8, with its radial width decreasing along the material falling direction, can compress the material, making it less likely for dust wrapped around the outer surface of the material to be stirred up, thus further reducing the amount of dust generated by the falling material.

[0064] In addition, the dust outlet 107 opened on the wall of the outer casing 101 can suck away a small amount of dust generated by the material falling along the discharge gap 8, thereby avoiding dust pollution at the loading site.

[0065] In this invention, the inclination angle of the second inclined surface 303, the inclination angle of the side wall of the discharge buffer hopper 2, and the radial width of the discharge gap 8 are all set according to different types of materials, thereby maximizing the control of dust escape.

[0066] like Figure 5 As shown, both the discharge pipe 4 and the sleeve pipe 5 are hollow cylinders;

[0067] The inner diameter of the discharge pipe 4 is equal to the inner diameter of the small opening of the discharge buffer hopper 2, which allows all the material from the discharge gap 8 to fall into the discharge pipe 4. The material is discharged downward in the form of a regular cylindrical material column inside the discharge pipe 4, ensuring that the material does not disperse before entering the hopper below the bulk material weighing scale.

[0068] A dust removal port 6 is opened on the wall of the sleeve tube 5, which can remove the dust generated by the material falling in the discharge pipe 4, further reducing or suppressing the amount of dust escaping from the discharged material column;

[0069] The axial length of the sleeve tube 5 is 350mm-450mm longer than that of the discharge tube 4. Since the amount of dust generated at the bottom of the discharge tube 4 is the largest, by increasing the height of the sleeve tube 5, the dust generated when the material column just leaves the discharge tube 4 can first disperse in the sleeve tube 5, so that the dust can be sucked away through the dust removal port 6.

[0070] The discharge pipe 4 and the sleeve pipe 5 are arranged concentrically to form a dust removal gap 9. The radial width of the dust removal gap 9 is 50mm-80mm. When the dust removal port 6 draws air, a negative pressure is formed in the dust removal gap 9, which can draw away the dust in the sleeve pipe 5. In addition, the dust removal gap 9 can ensure that when the dust removal port 6 draws air, it only draws away the escaped dust and does not draw away the material, thus protecting the material.

[0071] The working process of this embodiment is as follows:

[0072] When materials are loaded onto a transport vehicle using a bulk material weighing scale, the bulk material weighing scale is placed above the cargo hold on the transport vehicle.

[0073] Open the first valve 105, and the material enters the metering cylinder 102 through the feed pipe 104. The metering cylinder 102 weighs and measures the material until the material in the metering cylinder 102 reaches the preset weight. Then close the first valve 105 and stop feeding.

[0074] Subsequently, the second valve 106 is opened, and the material in the metering cylinder 102 is discharged;

[0075] The material in the metering cylinder 102 first falls into the discharge buffer hopper 2, and under the guidance of the first inclined surface 302 of the conical plug 3, it falls into the discharge gap 8 in an orderly manner. The dust generated by the material in the discharge buffer hopper 2 is sucked away through the dust discharge port 107.

[0076] After the material is squeezed by the discharge gap 8, the material falls into the discharge pipe 4 to form a material column, and thus the material is discharged in the form of a material column. The dust generated inside the discharge pipe 4 and at the bottom of the discharge pipe 4 is sucked away through the dust removal port 6.

[0077] Finally, a certain amount of material falls into the cargo hold on the transport vehicle, completing one quantitative feeding. The remaining material is fed multiple times in the same manner until all the material has been fed.

[0078] Based on the aforementioned bulk material weighing scale with discharge and dust suppression functions, one embodiment of the present invention provides a dust control method.

[0079] A material level sensor 7 is installed above the side wall of the discharge buffer hopper 2 to detect the material level in the discharge buffer hopper 2.

[0080] The bulk material weighing scale body 1 is equipped with a weighing control box 103;

[0081] A first control valve is installed inside the dust discharge port 107 of the bulk material weighing scale body 1, and a second control valve is installed inside the dust removal port 6 of the sleeve tube 5; the material level sensor 7, the first control valve, and the second control valve are all electrically connected to the weighing control box 103.

[0082] The weighing control box 103 can also control the opening and closing of the first valve 105 and the second valve 106;

[0083] The weighing control box 103 can control the dust removal air volume according to the signal from the level sensor 7. The dust removal air volume control includes the following steps:

[0084] S1. According to the set interval time, the level sensor 7 sends the material level signal in the discharge buffer hopper 2 to the weighing control box 103;

[0085] The interval time is set according to the material discharge speed, usually between 2 and 3 seconds;

[0086] S2. When the material level in the discharge buffer hopper 2 is higher than that of the level sensor 7, the level sensor 7 sends a "full" signal to the weighing control box 103, indicating that the material in the discharge buffer hopper 2 is sufficient at this time, the material is in a good compression state in the discharge gap 8, and the amount of dust escaping is small.

[0087] Subsequently, the weighing control box 103 controls the first control valve to close 30%-80% and the second control valve to close 30%-80%, thereby reducing the air volume at the dust discharge port 107 and the dust removal port 6;

[0088] S3. When the material level in the discharge buffer hopper 2 is lower than the level sensor 7 for the first time, the level sensor 7 sends a "first empty material" signal to the weighing control box 103, indicating that the material in the discharge buffer hopper 2 is not sufficient at this time, and the material in the discharge gap 8 may be in a poor compression state, and the amount of dust escaping increases.

[0089] Subsequently, the weighing control box 103 controls the first control valve to open by 60%-80% and the second control valve to open by 60%-80%, thereby increasing the air volume at the dust discharge port 107 and the dust removal port 6.

[0090] S4. When the material level in the discharge buffer hopper 2 is continuously lower than that of the level sensor 7, the level sensor 7 sends a "continuous empty material" signal to the weighing control box 103, indicating that the discharge buffer hopper 2 is about to be emptied, and the dust overflow is at its maximum at this time.

[0091] Subsequently, the weighing control box 103 controls the first control valve to fully open and the second control valve to fully open, thereby maximizing the airflow at the dust discharge port 107 and the dust removal port 6.

[0092] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A bulk material weighing scale with a material discharge dust suppression function, comprising a bulk material weighing scale body (1), characterized in that: The discharge port of the bulk material weighing scale body (1) is equipped with a material discharge dust suppression device; The structure of the discharge dust suppression device is as follows: it includes a funnel-shaped discharge buffer hopper (2), the large opening of the discharge buffer hopper (2) is connected to the discharge port of the bulk material weighing scale body (1), the small opening of the discharge buffer hopper (2) is connected to the discharge pipe (4), the inside of the discharge buffer hopper (2) is fitted with a conical plug (3), the outer side wall of the conical plug (3) and the inner side wall of the discharge buffer hopper (2) form a discharge gap (8), the outside of the discharge pipe (4) is concentrically fitted with a sleeve pipe (5), the inner side wall of the sleeve pipe (5) and the outer side wall of the discharge pipe (4) form an annular dust removal gap (9), the axial length of the sleeve pipe (5) is greater than the axial length of the discharge pipe (4), and a dust removal port (6) is opened above the side wall of the sleeve pipe (5). Material enters the discharge buffer hopper (2) from the discharge port of the bulk material weighing scale body (1). The conical plug (3) guides the material through the discharge gap (8) into the discharge pipe (4). The dust generated during the material's fall in the discharge pipe (4) is dispersed into the dust removal gap (9). The dust in the dust removal gap (9) is discharged through the dust removal port (6). The structure of the conical plug (3) is as follows: it includes a conical plug body (301), the conical plug body (301) includes a conical part in the shape of a cone, the side wall of the conical part forms a first inclined surface (302), the bottom of the conical part is concentrically provided with a frustum in the shape of an inverted frustum, and the side wall of the frustum forms a second inclined surface (303). The first inclined plane (302) guides the material to fall in an orderly manner; The second inclined surface (303) forms a discharge gap (8) with the discharge buffer hopper (2). The inclination angle of the second inclined surface (303) is not equal to the inclination angle of the side wall of the discharge buffer hopper (2), so that the radial width of the discharge gap (8) decreases along the material falling direction.

2. The bulk material weigher with a discharge dust suppression function according to claim 1, characterized in that: The conical plug (3) is arranged concentrically with the discharge port of the bulk material weighing scale body (1).

3. The bulk material weigher with a discharge dust suppression function according to claim 1, characterized in that: The inner diameter of the discharge pipe (4) is equal to the inner diameter of the small opening of the discharge buffer hopper (2).

4. The bulk material weigher with a discharge dust suppression function according to claim 1, characterized in that: The axial length of the sleeve (5) is 350mm-450mm longer than the axial length of the discharge pipe (4).

5. The bulk material weigher with a discharge dust suppression function according to claim 1, characterized in that: The radial width of the dust removal gap (9) is 50mm-80mm.

6. The bulk material weigher with a discharge dust suppression function according to claim 1, characterized in that: Both the discharge pipe (4) and the sleeve pipe (5) are hollow cylindrical.

7. The bulk material weigher with a discharge dust suppression function according to claim 1, characterized in that: The structure of the bulk material weighing scale body (1) is as follows: it includes a shell (101), a feed inlet is opened at the top of the shell (101), a discharge outlet is opened at the bottom of the shell (101), a measuring cylinder (102) is installed inside the shell (101), and a dust discharge port (107) is opened below the side wall of the shell (101). A feed pipe (104) is installed inside the feed inlet, and a first valve (105) is installed on the feed pipe (104). The feed pipe (104) is connected to the feed end of the metering cylinder (102). The discharge end of the metering cylinder (102) is equipped with a second valve (106). When the first valve (105) is opened, the material enters the metering cylinder (102) through the feed pipe (104). After the metering cylinder (102) weighs and measures the material inside, the second valve (106) is opened and the material is discharged from the metering cylinder (102).

8. A dust removal control method based on the bulk material weighing scale with a material discharge dust suppression function according to claim 1, characterized in that: A material level sensor (7) is installed above the side wall of the discharge buffer hopper (2), and the material level sensor (7) detects the material level in the discharge buffer hopper (2); The bulk material weighing scale body (1) is equipped with a weighing control box (103). A first control valve is installed in the dust discharge port (107) of the bulk material weighing scale body (1), and a second control valve is installed in the dust removal port (6) of the sleeve tube (5). The level gauge (7), the first control valve, and the second control valve are all electrically connected to the weighing control box (103); The weighing control box (103) can control the dust removal air volume according to the signal from the level sensor (7). When controlling the dust removal air volume, the following steps are included: S1. According to the set interval time, the material level device (7) sends the material level signal in the discharge buffer hopper (2) to the weighing control box (103); S2. When the material level in the discharge buffer hopper (2) is higher than the level sensor (7), the level sensor (7) sends a "full" signal to the weighing control box (103). Then the weighing control box (103) controls the first control valve to close 30%-80% and the second control valve to close 30%-80%, thereby reducing the air volume at the dust discharge port (107) and the dust removal port (6). S3. When the material level in the discharge buffer hopper (2) is lower than the level sensor (7) for the first time, the level sensor (7) sends a "first empty material" signal to the weighing control box (103). Then the weighing control box (103) controls the first control valve to open 60%-80% and the second control valve to open 60%-80%, thereby increasing the air volume at the dust discharge port (107) and the dust removal port (6). S4. When the material level in the discharge buffer hopper (2) is continuously lower than the level sensor (7), the level sensor (7) sends a "continuous empty material" signal to the weighing control box (103). Then the weighing control box (103) controls the first control valve to be fully opened and the second control valve to be fully opened, so that the air volume at the dust discharge port (107) and the dust removal port (6) is maximized.

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