Dust removal and suppression device for primary crushing station in open pit mine

Abstract

The present invention provides a dust removal and dust suppression device for a primary crushing station in an open-pit mine, and the problem to be solved is: how to provide low-cost dust pollution in the unloading hopper of the primary crushing station in an open-pit mine. The key points of the present invention are: it is composed of a bucket dust suppression cover and a self-circulating dust suppression chute; the bucket dust suppression cover is a rectangular parallelepiped frame composed of steel profiles as the skeleton of the bucket dust suppression cover, a belt door curtain is installed on one vertical surface of the skeleton as the entrance and exit of the dump truck, and a plastic film is installed on the remaining three vertical surfaces and the top surface as the cover wall and ceiling, and the internal volume of the bucket dust suppression cover is limited to being able to accommodate the dump truck in the unloading state; the self-circulating dust suppression chute is composed of a tubular chute and an airflow return pipe to form a loop, so that the feed port of the chute is set on the bottom surface of the cover inside the bottom beam, and is covered by the bucket dust suppression cover inside. The positive effect of the present invention is: it effectively suppresses the flying dust generated when unloading in the unloading pit of the primary crushing station in the open-pit mine. This method significantly reduces the energy consumption of previous dust removal methods.

Description

Technical Field

[0001] The invention relates to a dust removal and suppression device when a dump truck of a primary crushing station in an open-pit mine unloads materials at a unloading pit. Background Art

[0002] The unloading pit of the primary crushing station in an open-pit mine is the first gathering place where dump trucks transport materials from the working surface to the mineral processing plant, and then transport them away for processing through belt transportation. At present, most open-pit mines use an open method for unloading pits. During the unloading process of the truck, there is a drop of nearly ten meters between the rear of the truck and the bottom of the pit. The turbulent air flow aroused by the falling materials causes dust to escape everywhere, becoming the main dust source, causing dust to fly and pollute the environment. In response to this problem, the current solutions include wet methods such as negative pressure induced dust removal and dry fog dust removal, and dry methods such as cyclone dust collectors, bag dust collectors, and electrostatic precipitators. After the implementation of these dust removal technologies, certain dust removal effects will be achieved in the short term, but there are problems such as high power consumption and difficult equipment maintenance. For example, bag dust collectors often have a "sticky bag" phenomenon after running for a period of time. The dry fog dust removal method has too high requirements for water quality and high equipment operating costs. Negative pressure induced dust removal generally uses high-power equipment to generate strong negative pressure to ensure dust removal effect, which consumes a lot of electricity. The above method greatly increases the cost per ton of coal, and the dust removal effect continues to decline due to poor maintenance after the equipment has been running for a period of time, so that it is finally shelved. Therefore, it is still an urgent problem to completely solve the problem of dust pollution in the unloading hopper of the first-level crushing station in the open-pit mine. Summary of the invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a dust removal and dust suppression device for a primary crushing station in an open-pit mine.

[0004] The object of the present invention is achieved in this way: it is composed of a truck bucket dust suppression cover and a self-circulating dust suppression chute;

[0005] The truck bed dust suppression hood is a rectangular parallelepiped frame formed by steel profiles as the skeleton of the truck bed dust suppression hood, the skeleton is surrounded by four facades, a bottom surface and a top surface, a belt door curtain is installed on one facade of the skeleton as the entrance and exit of the dump truck, and plastic films are installed on the remaining three facades, i.e., two adjacent facades, a corresponding facade and the top surface as the cover wall and ceiling, and the inner volume of the truck bed dust suppression hood is limited to be able to accommodate the dump truck in the unloading state; an exhaust fan platform is arranged on the inner side of the cover wall corresponding to the entrance and exit, an explosion-proof exhaust fan is installed on the exhaust fan platform, and the air outlet of the explosion-proof exhaust fan is located outside the cover;

[0006] The self-circulating dust suppression chute is composed of a tubular chute (also called a closed chute) and an airflow return pipe to form a loop; the tubular chute includes a feed port, a discharge port, a bottom plate and a top plate, and a vertical plate is extended upward from the top plate side of the feed port, so that the cross section of the feed port is L-shaped, and the tubular chute is installed under the dust suppression cover of the truck bed, specifically, the bottom beam between the bottom surface of the frame and the wall directly opposite the cover is clamped and fixed at the L-shaped corner of the feed port, so that the feed port of the chute is set on the bottom surface of the cover inside the bottom beam, and is covered by the dust suppression cover of the truck bed; The reflux outlet and the reflux inlet of the two ports of the reflux pipe are respectively connected to the top plate at the feed port and the top plate at the discharge port of the tubular chute, so that the tube cavity of the airflow reflux pipe is connected with the tube cavity of the tubular chute to form a circular loop; an intercepting reflux filter gauze is arranged in the tube cavity of the airflow reflux pipe, and a semi-intercepting chute filter gauze is arranged in the tube cavity of the tubular chute, and the semi-intercepting chute filter gauze refers to the chute filter gauze arranged in the radial upper half of the chute tube cavity, that is, the height of the chute filter gauze is equal to half of the chute height (the distance from the top plate to the bottom plate).

[0007] Place the dust suppression cover on the ground at the edge of the unloading pit, and place the self-circulating dust suppression chute along the pit wall in the unloading pit. The tubular chute includes a feed port located in the dust suppression cover and on the ground far from the entrance and exit. Turn on the exhaust fan to gradually form a negative pressure in the cover. The rear of the dump truck enters the dust suppression cover through the entrance and exit curtains, the bucket is aimed at the feed port, the bucket is raised to perform unloading, and the material falls into the tubular chute to the discharge port. During the material sliding process, it drives the movement of the surrounding fluid, and a negative pressure area is formed in the tube cavity near the feed port of the tubular chute. At the discharge port of the chute, the material entrains a large amount of air, causing the air pressure here to rise, forming a pressure difference with the negative pressure area on the upper part of the chute. The dust-containing gas generated by the movement of the material passes through the semi-intercepting chute filter screen from the airflow reflux pipeline and the upper space of the chute under the action of the pressure difference, and returns to the vicinity of the upper reflux outlet, completing a cycle. When the dust-containing gas passes through the filter area, the dust is adsorbed by the filter layer. The function of the truck bed dust suppression hood is to control the small amount of unfiltered dust-containing gas within the dust suppression hood. After the explosion-proof exhaust fan is turned on, it can ensure that the internal space of the hood maintains a relatively negative pressure state during the truck's entry and exit, ensuring that the dust-containing gas does not overflow.

[0008] Compared with the prior art, the present invention has the positive effect of effectively suppressing the flying of dust generated when unloading in the unloading pit of the primary crushing station of the open-pit mine. This method significantly reduces the energy consumption of the previous dust removal methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention is further described below in conjunction with the accompanying drawings.

[0010] Figure 1 It is a schematic diagram of the present invention.

[0011] Figure 2 yes Figure 1 A-direction view.

[0012] Figure 3 This is a schematic diagram of the rear end of a dump truck entering the dust suppression hood to unload materials. DETAILED DESCRIPTION

[0013] See also Figure 1 It is composed of a dust suppression cover 1 and a self-circulating dust suppression chute 2;

[0014] The truck bed dust suppression hood is a rectangular parallelepiped frame formed by steel pipe profiles as the skeleton of the truck bed dust suppression hood. The skeleton is surrounded by four facades, a bottom surface 20 and a top surface. A belt door curtain 11 is installed on one facade of the skeleton as the entrance and exit of the dump truck. Plastic films are installed on the remaining three facades (i.e., two adjacent facades and one corresponding facade) and the top surface as the hood wall and ceiling 12. The internal volume of the truck bed dust suppression hood is limited to accommodate the dump truck in the unloading state. An exhaust fan platform 17 is arranged on the inner side of the hood wall 14 (hereinafter referred to as the directly opposite hood wall) corresponding to the entrance and exit. The platform is arranged in such a way that an intermediate crossbeam 18 is arranged below the crossbeam 13 on the directly opposite hood wall, the inner side of the platform 17 is fixed on the intermediate crossbeam 18, and a tripod 16 is arranged between the upper crossbeam and the outer side of the platform 17. An explosion-proof exhaust fan 15 is installed on the exhaust fan platform, and the air outlet of the explosion-proof exhaust fan is located outside the hood.

[0015] The self-circulating dust suppression chute 2 is composed of a tubular chute 21 and an inverted L-shaped airflow return pipe 23 to form a circular loop; the tubular chute includes a feed port 22, a discharge port 26, a bottom plate 29 and a top plate 25, and a vertical plate 221 is extended upward from the top plate side of the feed port, so that the cross section of the feed port is L-shaped. The tubular chute is installed under the dust suppression cover of the truck bucket, specifically, the bottom beam 19 between the bottom surface 20 of the frame and the wall 14 directly opposite the cover is clamped at the L-shaped corner of the feed port and fixed, so that the feed port of the chute is arranged on the inner bottom surface of the cover inside the bottom beam, and is covered by the dust suppression cover of the truck bed; the two ports of the airflow return pipe, the return outlet and the return inlet, are respectively connected to the top plate at the feed port of the tubular chute and the top plate at the discharge port, so that the tube cavity of the airflow return pipe is connected with the tube cavity of the tubular chute to form a ring loop; an interception reflux filter gauze 24 is arranged in the tube cavity of the airflow return pipe, and a semi-intercepting chute filter gauze 28 is arranged in the tube cavity of the tubular chute, see Figure 2 The semi-intercepting chute filter screen refers to the chute filter screen set in the upper half of the chute tube cavity radially, that is, the height of the chute filter screen is equal to half of the chute height (the distance between the top plate and the bottom plate). The chute body and its outlet adopt an arc shape 27, which can convert the material flow direction from impacting the feed plate to flowing out horizontally with the feed plate, which reduces the material flow energy on the one hand, and reduces the impact of the material flow and the equipment on the other hand, greatly reducing the amount of dust.

[0016] See also Figure 3, place the dust suppression cover on the ground at the edge of the unloading pit, and place the self-circulating dust suppression chute along the pit wall in the unloading pit. The tubular chute includes a feed port located in the dust suppression cover and on the ground far from the entrance and exit; turn on the exhaust fan to gradually form a negative pressure in the cover; the rear end of the dump truck 100 enters the dust suppression cover through the entrance and exit curtain, the bucket is aligned with the feed port, the bucket is raised to perform unloading, and the material 101 falls into the tubular chute to the discharge port. During the material sliding process, the surrounding fluid is driven to move, and a negative pressure area is formed in the tube cavity near the feed port of the tubular chute. At the discharge port of the chute, the material entrains a large amount of air, causing the air pressure here to rise, forming a pressure difference with the negative pressure area on the upper part of the chute. The dust-containing gas generated by the movement of the material passes through the airflow reflux pipeline and the upper space of the chute through the semi-intercepting chute filter screen under the action of the pressure difference, and returns to the vicinity of the upper reflux outlet, completing a cycle. When the dust-containing gas passes through the filter area, the dust is adsorbed by the filter layer. The function of the truck bed dust suppression hood is to control the small amount of unfiltered dust-containing gas within the dust suppression hood. After the explosion-proof exhaust fan is turned on, it can ensure that the internal space of the hood maintains a relatively negative pressure state during the truck's entry and exit, ensuring that the dust-containing gas does not overflow.

[0017] The open-air part of the unloading pit is covered with a cover plate 30.

Claims

1. A dust removal and suppression device for a primary crushing station in an open-pit mine, comprising a tubular chute, characterized in that: It is composed of a dust suppression cover for the truck bed and a self-circulating dust suppression chute; The truck bed dust suppression hood is a rectangular parallelepiped frame made of steel profiles as the skeleton of the truck bed dust suppression hood. The skeleton is surrounded by four facades, a bottom surface and a top surface. A belt door curtain is installed on one facade of the skeleton as the entrance and exit of the dump truck. Plastic films are installed on the remaining three facades, i.e., two adjacent facades, a corresponding facade and the top surface as the cover wall and ceiling. The internal volume of the truck bed dust suppression hood is limited to being able to accommodate the dump truck in the unloading state; an exhaust fan platform is arranged on the inner side of the cover wall corresponding to the entrance and exit, and an explosion-proof exhaust fan is installed on the exhaust fan platform, and the air outlet of the explosion-proof exhaust fan is located outside the cover; the exhaust fan platform is arranged in such a way that an intermediate crossbeam is arranged below the crossbeam on the opposite cover wall, the inner side of the platform is fixed on the intermediate crossbeam, and a tripod is arranged between the upper crossbeam and the outer side of the platform; The self-circulating dust suppression chute is composed of a tubular chute and an inverted L-shaped airflow return pipe to form a loop; the tubular chute includes a feed port, a discharge port, a bottom plate and a top plate, and a vertical plate is extended upward from the top plate side of the feed port, so that the cross section of the feed port is L-shaped, and the tubular chute is installed under the dust suppression cover of the truck bed, specifically, the bottom beam between the bottom surface of the frame and the wall directly opposite the cover is clamped and fixed at the L-shaped corner of the feed port, so that the feed port of the chute is set on the bottom surface of the cover inside the bottom beam, and is covered by the dust suppression cover of the truck bed; The two ports of the airflow reflux pipe, the reflux outlet and the reflux inlet, are respectively connected to the top plate at the feed port and the top plate at the discharge port of the tubular chute, so that the tube cavity of the airflow reflux pipe is connected with the tube cavity of the tubular chute to form a ring loop; an intercepting reflux filter gauze is arranged in the tube cavity of the airflow reflux pipe, and a semi-intercepting chute filter gauze is arranged in the tube cavity of the tubular chute, and the semi-intercepting chute filter gauze refers to the chute filter gauze arranged in the radial upper half of the chute tube cavity, that is, the height of the chute filter gauze is equal to half of the chute height.

2. The dust removal and dust suppression device for the primary crushing station of an open-pit mine according to claim 1 is characterized in that: The rectangular parallelepiped frame formed by steel profiles refers to a rectangular parallelepiped frame formed by steel pipe profiles.

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