CN114453240A

CN114453240A - Bidirectional gas-assisted vibrating screen and screen cleaning method

Info

Publication number: CN114453240A
Application number: CN202210125937.6A
Authority: CN
Inventors: 何德麟; 王波; 李泽林; 吴海升; 黄清清
Original assignee: Chengdu West Petroleum Equipment Co ltd
Current assignee: Chengdu West Petroleum Equipment Co ltd
Priority date: 2022-02-10
Filing date: 2022-02-10
Publication date: 2022-05-10

Abstract

The invention discloses a bidirectional gas-assisted vibrating screen and a screen cleaning method, which comprises a filtering group, a valve group, a fan (3) and a gas-liquid separation box (5), wherein the screen (6) is fixedly arranged on the upper plane of the gas-liquid separation box (5) to form a sealed cavity, and the filtering group, the valve group, the fan (3) and the gas-liquid separation box (5) are communicated through pipeline components to form a wind path system; the positive pressure and the negative pressure in the cavity are changed by changing the direction of the wind in the wind path system; the valve group comprises a first valve (21) and a second valve (22), and the fan (3) is connected between the first valve (21) and the second valve (22); the first valve (21) and the second valve (22) are linked through electric control. The invention has the advantages of improving the solid-liquid phase screening separation efficiency, fully reducing the liquid content of rock debris and preventing the screen mesh from being blocked.

Description

Bidirectional gas-assisted vibrating screen and screen cleaning method

Technical Field

The invention relates to the technical field of vibrating screens, in particular to a bidirectional gas-assisted vibrating screen and a screen cleaning method.

Background

The screen box is an important part for screening materials by the vibrating screen, is usually made of steel plates through electric welding, and limits the movement area of the materials, namely the rectangular screening area, on one hand, so that the screening of the linear vibrating screen materials becomes regular. On the other hand, the cover can prevent dust from entering and prevent powder particle materials from diffusing during screening. Most of the existing vibrating screens can only carry out solid-liquid separation, gas in the vibrating screens cannot be treated, and in the using process of the vibrating screens, the volume content of liquid in rock debris separated from the solid-liquid separation is found to be high, so that the subsequent treatment is not facilitated; negative pressure shale shaker, the condition that screen cloth paste sieve can appear in traditional shale shaker at the operation in-process, especially negative pressure shale shaker is opening the negative pressure function after, the solid phase granule that is slightly bigger than the screen cloth mesh is under the absorptive effect of negative pressure, the mesh is stopped up on the mesh very easily by the card, the condition of pasting the sieve is in case begin to appear, the area can enlarge gradually, screening efficiency has been reduced, the life-span of influence screen cloth, generally need the manual work to go to wash clean the sifter, operating personnel's intensity of labour has so greatly increased.

In patent CN202021873901.9, an electric adjusting air screen device is disclosed, which comprises a box body, wherein a feed inlet, a positive pressure air inlet and a negative pressure dust extraction port are arranged at the upper part of the box body, and a coarse material outlet and a fine material outlet are arranged at the bottom; an air inlet adjusting device, a flow guiding grading device and a grid grading device are sequentially arranged in the box body and between the positive pressure air inlet and the negative pressure dust extraction port. The utility model discloses a simple structure, low in production cost and use cost are honest and clean, the simple operation nature is high, can realize the screening hierarchical regulation of different grades of joining in marriage, the control flexibility is good, the screening precision is high, and through the wind current screening and striking dispersion, be applicable to the high-efficient screening classification of all kinds of materials, especially, can make that it is higher to contain water, wrap up in the serious material striking dispersion back of powder, carry out high-efficient screening, be difficult for blockking up the screen cloth, high production efficiency, the throughput is strong, but this kind of structure of malleation air inlet negative pressure air-out on one side, make the solid phase granule of the negative pressure end of screen cloth still slowly pile up, make the condition of pasting the sieve appear.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a solution for blocking a screen mesh and pasting a screen in the screening process of a bidirectional gas-assisted vibrating screen.

The purpose of the invention is realized by the following technical scheme:

a bi-directional gas-assisted shaker comprising:

the filter, the valve group, the fan and the gas-liquid separation box are communicated through a pipeline assembly to form a wind path system; the positive and negative pressure in the cavity is changed by changing the direction of the wind in the wind path system.

Further, the valve group comprises a first valve and a second valve, and the fan is connected between the first valve and the second valve; the first valve and the second valve are linked through electric control.

Further, the filtering set comprises a first filter and a second filter, and the first filter and the second filter are respectively communicated with the outer side ends of the first valve and the second valve.

Further, the pipeline assembly comprises a fan air inlet pipe, a first pipeline, a second pipeline and a fan air outlet pipe, a first filter and a first valve are sequentially fixed on the outer side of the fan air inlet pipe, and a second valve and a second filter are sequentially arranged on the outer side of the fan air outlet pipe.

Furthermore, one end of the first pipeline is communicated with the first valve, and the other end of the first pipeline is communicated with the gas-liquid separation tank.

Furthermore, one end of the second pipeline is communicated with the second valve, and the other end of the second pipeline is communicated with the middle part of the first pipeline.

A screen mesh cleaning method of a bidirectional gas-assisted vibrating screen comprises the following steps:

the air inlet pipe of the fan is communicated with the second pipeline and disconnected with the filter by adjusting the second valve, and the third pipeline is also in a disconnected state, so that the fan sucks the inner cavity of the gas-liquid separation box, and the inner cavity is in a negative pressure state;

the air inlet pipe of the fan is communicated with the filter and the second pipeline is disconnected by adjusting the first valve and the second valve; the air outlet pipe of the fan is communicated with the third pipeline and is disconnected with the filter, so that the fan blows air to the inner cavity of the gas-liquid separation box, and the cavity is in a positive pressure state;

when the cavity is in a negative pressure state, air flow from top to bottom is formed on the screen and penetrates through the meshes of the screen, the air flow sucks partial liquid attached to the rock debris and close to the screen into the cavity, so that the moisture content of the rock debris is less, and meanwhile, the air flow sucks a part of solid-phase particles larger than the meshes to be clamped and block the meshes to form a paste screen;

when the cavity is in a positive pressure state, the airflow passes through the mesh from bottom to top to push up the blocked solid-phase particles, the turnover probability of the materials on the screen is increased, the other surface of the solid-phase particles is favorably contacted with the mesh surface in the next negative pressure state, the rock debris is treated to be drier, the liquid loss is less, the blockage of the surface of the mesh of the screen can be reduced or eliminated in the positive pressure state, the screen pasting phenomenon cannot be generated, and the service life of the screen is prolonged;

the negative pressure state and the positive pressure state are alternately rotated, so that the screening efficiency is improved, the rock debris is drier, the drilling fluid loss is less, the blockage is reduced or avoided, and the screen pasting is avoided.

The invention has the beneficial effects that:

according to the bidirectional gas-assisted vibrating screen and the screen cleaning method, positive and reverse air flows are provided for the cavity of the gas-liquid separation box on the screen box body through the fan, so that negative and positive pressure states are formed in the closed cavity at the lower part of the screen; in the operation process of the vibrating screen, the solid-liquid separation capacity of oversize materials can be increased in the screening and vibrating process in a negative pressure state, and the liquid content of the surface of rock debris is reduced; the positive pressure state can be used for increasing the rolling capacity of solid phase on the screen, removing solid phase particles blocking the meshes of the screen, and has the function of removing blockage and unblocking the screen; the automatic conversion of positive and negative pressure and the alternate operation of positive and negative pressure are realized through pipeline configuration and an electric control valve group, so that the equipment always processes a good separation state, and the time interval length and the pulse period of the positive and negative pressure are set and adjusted according to the operation working condition, so that a good screening effect is achieved.

Drawings

FIG. 1 is a schematic connection diagram of the present invention;

FIG. 2 is a schematic view of the air passage in a negative pressure state according to the present invention;

FIG. 3 is a schematic view of the air path in the positive pressure state of the present invention.

In the figure, 11-a first filter, 12-a second filter, 21-a first valve, 22-a second valve, 3-a fan, 5-a gas-liquid separation box, 6-a screen, 71-a fan air inlet pipe, 72-a second pipeline, 73-a third pipeline 74-a fan air outlet pipe.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In this embodiment, as shown in fig. 1 to 3, a bidirectional gas-assisted vibrating screen includes a filtering set, a valve set, a fan 3, and a gas-liquid separating box 5, wherein a screen 6 is fixed on an upper plane of the gas-liquid separating box 5 to form a sealed cavity, and the filtering set, the valve set, the fan 3, and the gas-liquid separating box 5 are communicated through a pipeline assembly to form an air path system; the positive and negative pressure in the cavity is changed by changing the direction of the wind in the wind path system.

The bidirectional gas-assisted vibrating screen comprises a screen frame, a screen box is arranged in the screen frame, the gas-liquid separation box 5 is positioned at the lower side of the screen box, the screen 6 is positioned between the gas-liquid separation box 5 and the screen box, and the fan 3 is fixed at the upper side of the screen frame; the middle part of the gas-liquid separation box 5 is sunken downwards to form a liquid phase outlet, a tank body is further arranged outside the screen box, liquid is filled in the tank body, the outer side end of the liquid phase outlet is connected with a hose, and the extending end of the hose is directly immersed below the liquid level in the tank body, so that a liquid seal is formed.

The gas-liquid separation box 5 is integrally hopper-shaped, and the screen 6 is positioned at the upper side of the feeding end of the gas-liquid separation box 5.

The embodiment is further configured as follows: the valve group comprises a first valve 21 and a second valve 22, and the fan 3 is connected between the first valve 21 and the second valve 22; the first valve 21 and the second valve 22 are linked through electric control.

The embodiment is further configured as follows: the filter group comprises a first filter 11 and a second filter 12, and the first filter 11 and the second filter 12 are respectively communicated with the outer ends of a first valve 21 and a second valve 22.

The embodiment is further configured as follows: the pipeline component comprises a fan air inlet pipe 71, a first pipeline 72, a second pipeline 73 and a fan air outlet pipe 74, wherein a first filter 11 and a first valve 21 are sequentially fixed on the outer side of the fan air inlet pipe 71, and a second valve 22 and a second filter 12 are sequentially arranged on the outer side of the fan air outlet pipe 74. The inner sides of the fan air inlet pipe 71 and the fan air outlet pipe 74 are fixedly communicated with the fan 3.

In this embodiment, the outer side of the fan 3 is provided with a connecting member protruding outward, and both ends of the fan air inlet pipe 71 are inserted into the corresponding connecting members and fixed by a snap ring; the left side and the right side of the gas-liquid separation box 5 are provided with air draft shells, the left outer side and the right outer side of the gas-liquid separation box 5 are fixed with the inner sides of the air draft shells through welding, and the screen 6 is fixed between the two air draft shells; the air draft casing is integrally of a cuboid structure, a cavity is formed in the air draft casing, a long hole is formed in the inner side wall of the air draft casing, a 7-shaped folded piece is arranged on the inner side wall of the air draft casing, the folded piece and the long hole form an air draft opening, and the suction end face of the air draft opening faces the inside of the gas-liquid separation box 5.

The embodiment is further configured as follows: one end of the first pipeline 72 is communicated with the first valve 21, and the other end of the first pipeline 72 is communicated with the gas-liquid separation tank 5.

The embodiment is further configured as follows: one end of the second pipe 73 communicates with the second valve 22, and the other end of the second pipe 73 communicates with the middle portion of the first pipe 72.

the second valve 22 is adjusted to enable the fan air inlet pipe 71 to be communicated with the second pipeline 72 and disconnected with the filter 11, and the third pipeline 73 is also in a disconnected state, so that the fan 3 sucks the inner cavity of the gas-liquid separation box 5, and the inner cavity is in a negative pressure state;

the first valve 21 and the second valve 22 are adjusted, so that the fan air inlet pipe 71 is communicated with the filter 11 and the second pipeline 72 is disconnected; the fan air outlet pipe 74 is communicated with the third pipeline 73 and is disconnected with the filter 12, so that the fan 3 blows air to the inner cavity of the gas-liquid separation box 5, and the cavity is in a positive pressure state;

when the cavity is in a negative pressure state, air flow from top to bottom is formed on the screen 6 and penetrates through the meshes of the screen 6, the air flow sucks part of liquid attached to the rock debris and close to the screen 6 into the cavity, so that the moisture content of the rock debris is less, and meanwhile, the air flow sucks part of solid-phase particles larger than the meshes to clamp and block the meshes to form a paste sieve;

when the cavity is in a positive pressure state, the airflow passes through the mesh from bottom to top to push up the blocked solid-phase particles, the turnover probability of the materials on the screen is increased, the other surface of the solid-phase particles is favorably contacted with the mesh surface in the next negative pressure state, the rock debris is treated to be drier, the liquid loss is less, the blockage of the surface of the mesh of the screen can be reduced or eliminated in the positive pressure state, the screen pasting phenomenon cannot be generated, and the service life of the screen 6 is prolonged;

When the cavity is in a negative pressure state, the first filter 11 is disconnected, the second filter 12 is communicated, and the air path is sucked into the cavity from the outside of the screen and then sequentially passes through the first valve 21, the fan 3, the second valve 22 and the second filter 12.

When the cavity is in a positive pressure state, the first filter 11 is communicated, the second filter 12 is disconnected, the air path is generated from the fan, and the air path sequentially passes through the first filter 11, the first valve 21, the fan 3 and the second valve 22 and then enters the cavity.

The working principle of the invention is as follows:

the bidirectional gas-assisted vibrating screen and the screen cleaning method realize the negative pressure and positive pressure state in a closed cavity at the lower part of the screen 6 by providing positive and reverse airflows in a cavity of a gas-liquid separation box 5 on a screen box body through a fan; in the operation process of the vibrating screen, the solid-liquid separation capacity of oversize materials can be increased in the screening and vibrating process in the negative pressure state, and the liquid content of the surface of rock debris is reduced, when the cavity is in the negative pressure state, the first filter 11 is closed, the second filter 12 is opened, the air path is sucked into the cavity from the outside of the screen, and then the air path sequentially passes through the first valve 21, the fan 3, the second valve 22 and the second filter 12; when the cavity is in a positive pressure state, the first filter 11 is opened, the second filter 12 is closed, the air path is generated from the fan, and the air path sequentially passes through the first filter 11, the first valve 21, the fan 3 and the second valve 22 and then enters the cavity; the automatic conversion of positive and negative pressure and the alternate operation of positive and negative pressure are realized through pipeline configuration and an electric control valve group, so that the equipment always processes a good separation state, and the time interval length and the pulse period of the positive and negative pressure are set and adjusted according to the operation working condition, so that a good screening effect is achieved.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, or orientations or positional relationships that the products of the present invention are usually placed in when used, or orientations or positional relationships that are usually understood by those skilled in the art, and are used only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the equipment or the elements that are referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is also to be noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be interpreted broadly, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect through an intermediate medium, and the connection may be internal to the two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

Claims

1. A two-way gas-assisted vibrating screen, comprising:

the air-liquid separation device comprises a filtering group, a valve group, a fan (3) and an air-liquid separation box (5), wherein a screen (6) is fixedly arranged on the upper plane of the air-liquid separation box (5) to form a sealed cavity, and the filtering group, the valve group, the fan (3) and the air-liquid separation box (5) are communicated through a pipeline assembly to form an air path system; the positive and negative pressure in the cavity is changed by changing the direction of the wind in the wind path system.

2. The bi-directional gas-assisted vibrating screen of claim 1, wherein: the valve group comprises a first valve (21) and a second valve (22), and the fan (3) is connected between the first valve (21) and the second valve (22); the first valve (21) and the second valve (22) are linked through electric control.

3. The bi-directional gas-assisted vibrating screen of claim 2, wherein: the filter group comprises a first filter (11) and a second filter (12), wherein the first filter (11) and the second filter (12) are respectively communicated with the outer ends of a first valve (21) and a second valve (22).

4. The bi-directional gas-assisted vibrating screen of claim 3, wherein: the pipeline subassembly includes fan air-supply line (71), first pipeline (72), second pipeline (73) and fan play tuber pipe (74), the outside of fan air-supply line (71) is fixed with first filter (11) and first valve (21) in proper order, the outside that the fan goes out tuber pipe (74) has set gradually second valve (22) and second filter (12).

5. The bi-directional gas-assisted vibrating screen of claim 4, wherein: one end of the first pipeline (72) is communicated with the first valve (21), and the other end of the first pipeline (72) is communicated with the gas-liquid separation tank (5).

6. The bi-directional gas-assisted vibrating screen of claim 4, wherein: one end of the second pipeline (73) is communicated with the second valve (22), and the other end of the second pipeline (73) is communicated with the middle part of the first pipeline (72).

7. The method for cleaning the screen cloth of the bidirectional gas-assisted vibrating screen as claimed in any one of claims 1 to 6, which is characterized by comprising the following steps:

the air inlet pipe (71) of the fan is communicated with the second pipeline (72) by adjusting the first valve (21) and the second valve (22), and the third pipeline (73) is disconnected with the air outlet pipe (74) of the fan, so that the fan (3) sucks the inner cavity of the gas-liquid separation box (5) and the inner cavity is in a negative pressure state;

the air inlet pipe (71) of the fan is communicated with the filter (11) and disconnected with the second pipeline (72) by adjusting the first valve (21) and the second valve (22), and the air outlet pipe (74) of the fan is disconnected with the filter (12) and communicated with the second pipeline (73), so that the fan (3) blows air to the inner cavity of the gas-liquid separation box (5), and the cavity is in a positive pressure state;

when the cavity is in a negative pressure state, air flow from top to bottom is formed on the screen (6) and penetrates through the meshes of the screen (6), the air flow sucks partial liquid attached to the rock debris and close to the screen (6) into the cavity, so that the moisture content of the rock debris is less, but meanwhile, the air flow can suck partial solid-phase particles larger than the meshes to be clamped and block the meshes, and a paste sieve is formed;

when the cavity is in a positive pressure state, the airflow passes through the mesh from bottom to top to push up the blocked solid-phase particles, the probability of turning over materials on the screen is increased, the other surface of the solid-phase particles is favorably contacted with the mesh surface in the next negative pressure state, the rock debris is treated to be drier, the liquid loss is less, the blockage of the surface of the mesh of the screen can be reduced or eliminated in the positive pressure state, the screen pasting phenomenon cannot be generated, and the service life of the screen (6) is prolonged;