An automatic control device for air knife blowing and spray dust removal

Abstract

This invention discloses an automatic control device for air knife blowing and spray dust removal, comprising: an air knife device installed on the return section of a belt conveyor; an air supply device for supplying gas to the air knife device; a spray device installed on the return section of the belt conveyor; a water supply device for supplying water to the spray device; a curtain device installed downstream of the air knife device along the return direction of the belt conveyor; a dust concentration sensor installed downstream of the curtain device along the return direction of the belt conveyor; and a control device connected to the air supply device, water supply device, and dust concentration sensor. During use, this invention relies on airflow to blow away materials adhering to the belt, without damaging the belt, thus achieving the cleaning purpose. Simultaneously, the spray device increases air humidity, achieving dust removal with uniform mixing and good atomization. This invention is installed inside a hopper, where falling dust falls into the hopper.

Description

Technical Field

[0001] This invention relates to the field of material conveying equipment technology, and in particular to an automatic control device for air knife blowing and spray dust removal. Background Technology

[0002] Belt conveyors are widely used in material conveying in mining, coal, metallurgy, steel, and building materials industries. Their conveying capacity covers materials of various shapes and particle sizes. However, a prominent problem they face in practical applications is dust pollution. Dust issues mainly occur during material transfer, discharge, and conveying processes. This not only seriously pollutes the production environment and harms the health of employees, but also increases cleaning workload and accelerates equipment wear, shortening its service life.

[0003] During the return journey of the conveyor belt, some material will stick to the belt and fall along the return direction, causing a large amount of material to accumulate under the belt. This requires workers to clean it regularly, which increases maintenance costs and causes secondary dust, resulting in excessive dust content in the working environment.

[0004] Currently, many dust removal systems in China have dust hoods installed in front of the conveyor belt, but the area behind the material drop point is open. The return conveyor belt cannot be completely sealed in the width direction, causing dust to escape from these gaps and resulting in excessive dust concentration in the environment. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned shortcomings and defects of the prior art by providing an automatic control device for air knife blowing and spray dust removal, thereby solving the above-mentioned problems.

[0006] The technical problem solved by this invention can be achieved by the following technical solutions: An automatic control device for air knife blowing and spray dust removal includes: An air knife device installed on the return section of a belt conveyor; An air supply device that provides gas to the air knife device; A spraying device installed on the return section of the belt conveyor; A water supply device for supplying water to the spraying device; A curtain device is installed downstream of the air knife device in the return direction of the belt conveyor. A dust concentration sensing device is installed downstream of the curtain device in the return direction of the belt conveyor. A control device connected to the gas supply device, water supply device, and dust concentration sensing device.

[0007] In a preferred embodiment of the present invention, the angle between the air outlet direction of the air knife device and the return section transport direction of the belt conveyor is 30° to 70°.

[0008] In a preferred embodiment of the present invention, the air supply device includes a fan and an air pipe, one end of the air pipe is connected to the air outlet of the fan, and the other end is connected to the air inlet of the air knife device, and the fan is connected to the control device.

[0009] In a preferred embodiment of the present invention, a chassis is further included. An operation panel is provided on the outer wall of the chassis. The fan, electrical mounting plate, frequency converter, and air filter are provided inside the chassis. The fan is connected to a control device through the electrical mounting plate. The electrical mounting plate is connected to the frequency converter and the operation panel. An installation cavity with an inlet and an outlet is formed inside the chassis. The frequency converter is disposed in the installation cavity. The air filter is connected to the inlet of the installation cavity. The outlet of the installation cavity is connected to the air inlet of the fan through a pipe.

[0010] In a preferred embodiment of the present invention, the spraying device includes a first atomizing nozzle and two second atomizing nozzles. The first atomizing nozzle is disposed on one side of the middle part of the air knife device, and the two second atomizing nozzles are respectively disposed on one side of both ends of the air knife device. The water inlet ends of the first atomizing nozzle and the second atomizing nozzle are connected to the water supply device.

[0011] In a preferred embodiment of the present invention, the second atomizing nozzle is connected to an angle adjustment device, the angle adjustment device including a screw fixed to the end of the air knife device and a first nut, a second nut and a third nut sequentially threaded onto the screw. The second atomizing nozzle is fixedly connected to the second nut. When the second nut is rotated to a suitable position so that the second atomizing nozzle is at a suitable angle, the first nut and the third nut are tightened toward the second nut, so that the second nut is fixed.

[0012] In a preferred embodiment of the present invention, the water supply device includes a water tank and a water pipe. A water filter and a variable frequency water pump are sequentially arranged on the water pipe along the water outlet direction. The variable frequency water pump is connected to the control device. The water inlet end of the water pipe is connected to the water tank, and the water outlet end is connected to a spray device.

[0013] In a preferred embodiment of the present invention, the outlet end of the water pipe is also connected to the air knife device.

[0014] In a preferred embodiment of the present invention, the curtain device includes a mounting frame connected to the frame and a rubber curtain fixed on the mounting frame. One end of the rubber curtain is connected to the mounting frame, and the other end contacts the surface of the belt on the return section of the belt conveyor and forms a certain compression bend, which can effectively avoid belt overlap and effectively prevent dust.

[0015] In a preferred embodiment of the present invention, the water spray volume of the spraying device is calculated using the following formula. (1) (2) (3) (4) (5) in, Q_l: Water volume during spraying, unit: m³ 3 / s, Q_g: Gas flow rate, unit: m³ / h 3 / s, D_w: Droplet diameter, unit: m. L: Spraying distance, unit: m Stk: Stokes number rho_p: Particle density, unit: kg / m³ 3 , D_p: Dust particle size, unit: m U_r: Relative velocity between gas and liquid, unit: m / s u: Dynamic viscosity of gases, unit: Pa·s Single droplet inertial trapping efficiency Single droplet interception and capture efficiency Single droplet capture efficiency C0: Initial dust concentration, unit: mg / m³ 3 , C1: Dust concentration after spraying, unit: mg / m³ 3 .

[0016] Due to the adoption of the above technical solution, the present invention has the following beneficial effects: During use, this invention relies on airflow to sweep away materials adhering to the conveyor belt. The airflow does not damage the belt, thus achieving the cleaning purpose. Simultaneously, a spray device is installed to increase air humidity and achieve dust removal, featuring uniform mixing and good atomization. This invention is installed inside the hopper; falling dust either settles inside the hopper or on its slope, eliminating the need for a separate dust collector, making cleaning convenient and requiring no additional filter. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of one embodiment of the present invention.

[0019] Figure 2 yes Figure 1 A schematic diagram of the structure along direction A.

[0020] Figure 3 This is a schematic diagram of the structure of a gas supply device according to an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the structure of an air knife device and a spray device according to an embodiment of the present invention.

[0022] Figure 5 This is a partial front view of an air knife device and a spray device according to an embodiment of the present invention.

[0023] Figure 6 This is a partial side view of an air knife device and a spray device according to an embodiment of the present invention.

[0024] Figure 7 This is a partial perspective view of an air knife device and a spray device according to an embodiment of the present invention.

[0025] Figure 8 This is a schematic diagram of the structure of a curtain device according to an embodiment of the present invention.

[0026] Reference numerals: Belt conveyor 10; Drive drum 10a; Idling drum 10b; Return section 11; Air knife device 100; Air outlet 110; Air supply device 200; Fan 210; Three-dimensional flow high-speed centrifugal impeller 211; High-speed motor 212; Air pipe 220; Control panel 230; Electrical mounting plate 240; Frequency converter 250; Air filter 260; Chassis 270; Spraying device 300; First atomizing nozzle 310; Second atomizing nozzle 320; Angle adjustment device 330; Screw 331; First nut 332a; Second nut 332b; Third nut 332c; Water supply device 400; Water tank 410; Water pipe 420; Water pipe branch 421; Water filter 430; Variable frequency water pump 440; Curtain device 500; Mounting bracket 510; Support plate 511; Angle steel 512; Connecting bolt 513; Rubber curtain 520; Dust concentration sensing device 600; Control device 700. Detailed Implementation

[0027] Preferred embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0028] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0029] It should be understood that although the terms "first," "second," "third," etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] See Figures 1 to 8The illustrated automatic control device for air knife blowing and spray dust removal includes an air knife device 100, an air supply device 200, a spray device 300, a water supply device 400, a curtain device 500, a dust concentration sensor 600, and a control device 700. The control device 700 is connected to the air supply device 200, the water supply device 400, and the dust concentration sensor 600. This automatic control device for air knife blowing and spray dust removal is installed inside a hopper and is used in conjunction with a belt conveyor device 10. The belt conveyor device is prior art, such as a belt conveyor, and has a drive roller 10a and a redirecting roller 10b.

[0031] The air knife device 100 is installed on the return section 11 of the belt conveyor 10. The air knife device 100 is a commonly used air knife in the prior art. It has a long strip-shaped air outlet 110, which sends high-pressure air into the air knife cavity and then sprays it out at high speed through the gap of the knife edge, blowing it toward the belt and blowing the material off. The angle between the air outlet direction of the air knife device 100 and the transport direction of the return section of the belt conveyor is 30° to 70°.

[0032] The gas supply device 200 provides gas to the air knife device 100. In this embodiment, the gas supply device 200 includes a fan 210 and an air pipe 220. One end of the air pipe 220 is connected to the air outlet of the fan 210, and the other end is connected to the air inlet of the air knife device 100. The fan 210 is connected to the control device 700. Preferably, the gas supply device 200 includes a housing 270. An operation panel 230 is provided on the outer wall of the housing 270. The fan 210, an electrical mounting plate 240, a frequency converter 250, and an air filter 260 are provided inside the housing 270. The fan 210 is connected to the control device 700 through the electrical mounting plate 240. The electrical mounting plate 240 is connected to the frequency converter 250 and the operation panel 230. The electrical mounting plate 240 is used to install electrical components such as controllers and circuit breakers. An installation cavity with an inlet and an outlet is formed inside the chassis 270. The frequency converter 250 is installed in the installation cavity. The air filter 260 is connected to the inlet of the installation cavity, and the outlet of the installation cavity is connected to the air inlet of the fan 210 through a pipe. Therefore, the heat generated by the frequency converter 250 can be carried away, and the fan 210 can also serve as a heat dissipation device for the frequency converter 250. The operation panel 230 is used to display and control various instruments, the working status of the equipment, and the input of controllable and adjustable variables. Panel buttons are installed next to the operation panel 230, including run, stop, alarm, and emergency stop buttons. In this embodiment, the fan 210 adopts a three-dimensional flow high-speed centrifugal impeller 211 directly connected to a high-speed motor 212, which has the characteristics of high efficiency, small size, light weight, large flow, and strong pressure rise capability. By adjusting the fan speed through the frequency converter, it can cope with various material adhesion situations.

[0033] The spraying device 300 is installed on the return section 11 of the belt conveyor 10. In this embodiment, the spraying device 300 includes a first atomizing nozzle 310 and two second atomizing nozzles 320. The first atomizing nozzle 310 is installed on one side of the middle part of the air knife device 100, and the two second atomizing nozzles 320 are respectively installed on one side of both ends of the air knife device 100 to expand the spraying range. The water inlet ends of the first atomizing nozzle 310 and the second atomizing nozzle 320 are connected to the water supply device 400. To facilitate adjustment of the spray angle, the second atomizing nozzle 320 is connected to the angle adjustment device 330. The angle adjustment device 330 includes a screw 331 fixed to the end of the air knife device 100 and a first nut 332a, a second nut 332b, and a third nut 332c sequentially threaded onto the screw. The second atomizing nozzle 320 is fixedly connected to the second nut 332b. When the second nut is rotated to a suitable position so that the second atomizing nozzle 320 is at a suitable angle, the first nut 332a and the third nut 332c are tightened toward the second nut, thereby fixing the second nut 332c and thus positioning the second atomizing nozzle 320 at a suitable spray angle.

[0034] The water supply device 400 provides water to the spraying device 300. In this embodiment, the water supply device 400 includes a water tank 410 and a water pipe 420. A water filter 430 and a variable frequency water pump 440 are sequentially arranged along the water outlet direction on the water pipe 420. The variable frequency water pump 440 is connected to the control device 700. The inlet end of the water pipe 420 is connected to the water tank 410, and the outlet end is connected to the spraying device 300. Preferably, the outlet end of the water pipe 420 has a water pipe branch 421 connected to one first atomizing nozzle 310 and two second atomizing nozzles 320 respectively. To improve the dustproof effect of this invention, a branch can be sent from the water pipe branch 421 to the air pipe 220 near the air knife device 100, allowing the high-pressure gas in the air pipe 220 to carry the water from the water pipe branch 421 into the air knife device 100. This results in the air blown out by the air knife device 100 carrying atomized water, preventing material from splashing on the conveyor belt and achieving a dustproof effect.

[0035] The curtain device 500 is positioned downstream of the air knife device 100 along the return direction of the belt conveyor. In this embodiment, the curtain device 500 includes a mounting frame 510 connected to the frame and a rubber curtain 520 fixed on the mounting frame 510. One end of the rubber curtain 520 is connected to the mounting frame 510, and the other end contacts the surface of the belt on the return section of the belt conveyor, forming a certain compression bend, which can effectively avoid belt overlap and effectively prevent dust. Specifically, the mounting frame 510 includes a support plate 511 and an angle steel 512. The support plate 511 and the angle steel 512 are welded into a whole. The support plate 511 is connected to the frame. The angle steel 512 and the rubber curtain 520 are respectively machined with multiple holes. The rubber curtain 520 is fixed to the angle steel 512 using connecting bolts 513. The thickness of the rubber curtain 520 can be selected from 1mm to 6mm.

[0036] The dust concentration sensor 600 is located downstream of the curtain device 500 along the return direction of the belt conveyor and is used to detect the concentration of suspended particulate matter in the air. The dust concentration sensor 600 is a dust concentration sensor of the prior art.

[0037] The control device 700 is existing technology and can be a PLC controller or other control devices commonly used in the field.

[0038] To obtain a suitable water spray volume, the water spray volume of the spraying device is calculated based on the environmental parameters of the work site using the following formula. (1) (2) (3) (4) (5) in, Q_l: Water volume during spraying, unit: m³ 3 / s, Q_g: Gas flow rate, unit: m³ / h 3 / s, D_w: Droplet diameter, unit: m. L: Spraying distance, unit: m Stk: Stokes number rho_p: Particle density, unit: kg / m³ 3 , D_p: Dust particle size, unit: m U_r: Relative velocity between gas and liquid, unit: m / s Dynamic viscosity of gases, unit: Pa·s Single droplet inertial trapping efficiency Single droplet interception and capture efficiency Single droplet capture efficiency C0: Initial dust concentration, unit: mg / m³ 3 , C1: Dust concentration after spraying, unit: mg / m³ 3 .

[0039] For example, based on the environmental parameters at the site, Q_g = 0.1m 3 / s; D_w=150μm; L=1m; rho_p=3000kg / m 3 ;D_p=4μm; U_r=15m / s; u=1.8*10 -5 Pa.s; C0 = 200 mg / m³ 3 C1 = 20 mg / m³ 3 Combining the above formulas (1)-(5), we can calculate: Q_l=2.5*10 -5 m 3 / s.

[0040] Based on the environmental parameters at the site, Q_g = 2.22m 3 / s; D_w=200μm; L=4m; rho_p=2600kg / m 3 ;D_p=10μm; U_r=8m / s; u=1.8*10 -5 Pa.s; CO = 500 mg / m³ 3 C1 = 10 mg / m³ 3 The calculation yields: Q_l = 2.9 * 10 -4 m 3 / s.

[0041] The working principle of this invention is as follows: When the blower 210 pressurizes the air, it enters the air knife device 100 through the air pipe 220 and blows it onto the belt from the air knife outlet. At the same time, the water supply device 400 operates to send high-pressure water through the water pipe 420 into the spray device 300. Some of the high-pressure water enters the air knife device 100, and the spray device 300 achieves an atomization effect, humidifying the air and causing the dust floating in the air to fall into the hopper along with the small droplets.

[0042] During use, this invention relies on airflow to sweep away materials adhering to the conveyor belt. The airflow does not damage the belt, thus achieving the cleaning purpose. Simultaneously, a spray device is installed to increase air humidity and achieve dust removal, featuring uniform mixing and good atomization. This invention is installed inside the hopper; falling dust either settles inside the hopper or on its slope, eliminating the need for a separate dust collector, making cleaning convenient and requiring no additional filter.

[0043] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0044] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0045] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An automatic control device for air knife blowing and spray dust removal, characterized in that, include: An air knife device installed on the return section of a belt conveyor; An air supply device that provides gas to the air knife device; A spraying device installed on the return section of the belt conveyor; A water supply device for supplying water to the spraying device; A curtain device is installed downstream of the air knife device in the return direction of the belt conveyor. A dust concentration sensing device is installed downstream of the curtain device in the return direction of the belt conveyor. A control device connected to the gas supply device, water supply device, and dust concentration sensing device.

2. The automatic control device for air knife blowing and spray dust removal according to claim 1, characterized in that, The angle between the air outlet direction of the air knife device and the return transport direction of the belt conveyor is 30° to 70°.

3. The automatic control device for air knife blowing and spray dust removal according to claim 1, characterized in that, The air supply device includes a fan and an air pipe. One end of the air pipe is connected to the air outlet of the fan, and the other end is connected to the air inlet of the air knife device. The fan is connected to the control device.

4. The automatic control device for air knife blowing and spray dust removal according to claim 3, characterized in that, It also includes a chassis, the outer wall of which is equipped with an operation panel. Inside the chassis are the fan, electrical mounting plate, frequency converter, and air filter. The fan is connected to the control device through the electrical mounting plate, which is connected to the frequency converter and the operation panel. The chassis forms a mounting cavity with an inlet and an outlet. The frequency converter is located in the mounting cavity. The air filter is connected to the inlet of the mounting cavity. The outlet of the mounting cavity is connected to the air inlet of the fan through a pipe.

5. The automatic control device for air knife blowing and spray dust removal according to claim 1, characterized in that, The spraying device includes a first atomizing nozzle and two second atomizing nozzles. The first atomizing nozzle is located on one side of the middle part of the air knife device, and the two second atomizing nozzles are respectively located on one side of both ends of the air knife device. The water inlet ends of the first atomizing nozzle and the second atomizing nozzle are connected to the water supply device.

6. The automatic control device for air knife blowing and spray dust removal according to claim 5, characterized in that, The second atomizing nozzle is connected to an angle adjustment device, which includes a screw fixed to the end of the air knife device and a first nut, a second nut, and a third nut connected to the screw in sequence by threads. The second atomizing nozzle is fixedly connected to the second nut. When the second nut is rotated to a suitable position so that the second atomizing nozzle is at a suitable angle, the first nut and the third nut are tightened toward the second nut, so that the second nut is fixed.

7. An automatic control device for air knife blowing and spray dust removal according to claim 1 or 5, characterized in that, The water supply device includes a water tank and a water pipe. A water filter and a variable frequency water pump are arranged sequentially along the water outlet direction of the water pipe. The variable frequency water pump is connected to the control device. The water inlet end of the water pipe is connected to the water tank, and the water outlet end is connected to the spray device.

8. The automatic control device for air knife blowing and spray dust removal according to claim 7, characterized in that, The outlet end of the water pipe is also connected to the air knife device.

9. The automatic control device for air knife blowing and spray dust removal according to claim 1, characterized in that, The curtain device includes a mounting frame connected to the frame and a rubber curtain fixed on the mounting frame. One end of the rubber curtain is connected to the mounting frame, and the other end contacts the surface of the belt on the return section of the belt conveyor, forming a certain compression bend, which can effectively avoid belt overlap and also effectively prevent dust.

10. The automatic control device for air knife blowing and spray dust removal according to claim 1, characterized in that, The water spray volume of the spray device is calculated using the following formula. （1） （2） （3） （4） （5） in, Q_l: Water volume during spraying, unit: m³ 3 / s, Q_g: Gas flow rate, unit: m³ / h 3 / s, D_w: Droplet diameter, unit: m. L: Spraying distance, unit: m Stk: Stokes number rho_p: Particle density of dust, unit: kg / m³ 3 , D_p: Dust particle size, unit: m U_r: Relative velocity between gas and liquid, unit: m / s u: Dynamic viscosity of gases, unit: Pa·s Single droplet inertial trapping efficiency Single droplet interception and capture efficiency Single droplet capture efficiency C0: Initial dust concentration, unit: mg / m³ 3 , C1: Dust concentration after spraying, unit: mg / m³ 3 .

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