Weighing and screening integrated pulverized coal screen capable of being used under positive pressure and negative pressure

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By achieving positive and negative pressure control inside the box shell of the coal powder screening equipment, the problems of screening mesh clogging and dust pollution are solved, screening efficiency and environmental safety are improved, and precise weighing of coal powder is achieved.

CN222587264UActive Publication Date: 2025-03-11XINXIANG CHENGXIN VIBRATION EQUIP CO LTD

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Patent Information

Application Number: CN202520146332.4
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2025-01-22
Publication Date: 2025-03-11
Estimated Expiration: 2035-01-22

AI Technical Summary

Technical Problem

Existing coal powder screening equipment is prone to screen clogging during the screening process, the screening efficiency is low, and the vibration method will produce a large amount of dust, affecting the working environment.

Method used

A integrated coal pulverized sieve with positive and negative pressures is designed. The positive and negative pressure inside the box shell is achieved by setting a box cover and a discharge hopper above and below the box shell, and connecting the positive and negative pressure equipment through pipelines. Positive pressure pushes coal powder through the screen to avoid blockage; negative pressure collects floating coal powder to reduce dust pollution.

Benefits of technology

It effectively avoids screen clogging, improves screening efficiency, reduces dust pollution, improves the working environment, and realizes accurate weighing of screened coal powder through weighing components.

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Abstract

The utility model discloses a weighing and screening integrated pulverized coal screen available for positive pressure and negative pressure, relates to the technical field of pulverized coal screens, and aims to solve the problems that a pulverized coal screen is easy to block and low in screening efficiency. Comprising a base and a box shell, the base is connected with the box shell through spring supporting legs, and an excitation source driving the box shell to vibrate is arranged on the outer wall of the box shell; the box shell is a shell with the upper end and the lower end being through, a box cover is arranged at the top of the box shell, a feeding port and a pipeline which are communicated with the interior of the box shell are arranged on the box cover, and the pipeline is connected with external positive and negative pressure equipment; a plurality of groups of screen frames are arranged in the box shell, and screen meshes are arranged on the screen frames; the box cover and the discharging hopper are arranged above and below the box shell correspondingly, positive pressure and negative pressure equipment are communicated with the interior of the box shell through the pipeline, the interior of the box shell is controlled by the positive pressure and negative pressure equipment, positive pressure and negative pressure in the box shell are achieved, the positive pressure pushes pulverized coal to penetrate through a screen, the screen is prevented from being blocked, and the negative pressure can collect the pulverized coal drifting away in the box shell; the working environment pollution is avoided.

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Description

Technical Field

[0001] The utility model relates to the technical field of coal powder screens, in particular to a weighing and screening integrated coal powder screen with positive and negative pressures. Background Art

[0002] In industry and experiments, coal powder of different particle sizes needs to be screened. The existing coal powder screening mostly adopts manual screening, which is time-consuming and labor-intensive. In the screening process, some coal powder will block the screen, affecting subsequent screening. If the resonance method is used for coal screening, the amplitude is large, which will generate a lot of dust and affect the working environment. If the amplitude is small, it is impossible to avoid coal powder blocking the screen.

[0003] Therefore, the present application provides an integrated coal powder screen with weighing and screening that can be used for positive and negative pressures to meet the needs. Utility Model Content

[0004] The purpose of the present application is to provide an integrated coal powder screen with weighing and screening that can be used for positive and negative pressures, aiming to solve the problems of easy clogging of the coal powder screen and low screening efficiency.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a weighing and screening integrated coal powder screen with positive and negative pressure, comprising a base and a box shell, the base is connected to the box shell by spring legs, and an excitation source for driving its vibration is provided on the outer wall of the box shell; the box shell is a shell that is transparent at both ends, a box cover is provided on the top of the box shell, a feed port and a pipeline that are connected to the inside of the box shell are provided on the box cover, and the pipeline is connected to positive and negative pressure equipment in the outside; a screen frame is provided inside the box shell, the screen frame is provided with multiple groups, and a screen is provided on the screen frame; by arranging a box cover and a discharge hopper above and below the box shell respectively, and connecting the positive and negative pressure equipment and the inside of the box shell through pipelines, the inside of the box shell is controlled by the positive and negative pressure equipment to realize positive and negative pressure inside the box shell, the positive pressure pushes the coal powder through the screen to avoid clogging of the screen, and the negative pressure can collect the coal powder floating inside the box shell to avoid polluting the working environment;

[0006] The bottom of the box shell is connected to a discharge hopper via a connecting sleeve, the top of the discharge hopper is connected to the inside of the box shell, a sealing plate is provided at the bottom of the discharge hopper, and the discharge hopper is connected to the base via fixed legs; a weighing assembly for weighing the screen frame is also provided on the discharge hopper, and spring legs and fixed legs are provided on the base, which are respectively connected to the box shell and the discharge hopper, and the two are connected by a connecting sleeve made of rubber material. When the excitation source drives the box shell to vibrate, it will not cause the discharge hopper to resonate.

[0007] Preferably, a support block is provided on the outer wall of the screen frame, and a mounting rod corresponding to the position of the support block is provided on the inner wall of the box shell.

[0008] Preferably, the mounting rod is an L-shaped rod including a horizontal rod and a vertical rod, and a through hole matching the size of the vertical rod is opened on the support block. By respectively arranging a box cover and a discharge hopper above and below the box shell, and connecting the positive and negative pressure equipment with the interior of the box shell through pipes, the interior of the box shell is controlled by the positive and negative pressure equipment to achieve positive and negative pressure inside the box shell. The positive pressure pushes the coal powder through the screen to avoid clogging of the screen, and the negative pressure can collect the coal powder floating inside the box shell to avoid polluting the working environment.

[0009] Preferably, a rotating shaft is slidably connected to the discharge hopper, and the rotating shaft includes an inner part and an outer part. The inner part is provided with a weighing assembly for weighing the screen frame, and the outer part is connected to the output end of the motor. The base is also provided with a telescopic cylinder for driving the motor to move in the vertical direction.

[0010] Preferably, the weighing assembly includes a weighing block and a weighing sensor, the weighing block is installed on the rotating shaft, the weighing block is provided with a groove, the weighing sensor is provided in the groove, the weighing sensor is also provided with a connecting block, the screen frame is provided with a mounting block corresponding to the position of the connecting block, and a weighing assembly is arranged on the discharging hopper to weigh the coal powder after screening. The mass of the coal powder on the screen can be obtained by subtracting the mass of the screen frame, the screen and the connecting block from the weighed value.

[0011] In summary, the technical effects and advantages of the utility model are:

[0012] In the utility model, a box cover and a discharge hopper are respectively arranged above and below the box shell, and the positive and negative pressure devices are connected to the inside of the box shell through pipelines, so that the inside of the box shell is controlled by the positive and negative pressure devices to achieve positive and negative pressure inside the box shell. The positive pressure pushes the coal powder to pass through the screen to avoid clogging of the screen, and the negative pressure can collect the coal powder floating inside the box shell to avoid polluting the working environment.

[0013] In the utility model, spring legs and fixed legs are arranged on the base, which are respectively connected to the box shell and the discharge hopper, and the two are connected by a connecting sleeve made of rubber. When the excitation source drives the box shell to vibrate, it will not drive the discharge hopper to resonate. A weighing component is arranged on the discharge hopper to weigh the coal powder after screening. The mass of the coal powder on the screen can be obtained by subtracting the mass of the screen frame, screen and connecting block from the weighed value.

[0014] In the utility model, a protective cloth is arranged between the weighing block and the connecting block to prevent coal powder from falling into the groove and affecting the accuracy of the weighing sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 It is a partial cross-sectional view of the utility model;

[0018] Figure 3 It is a schematic diagram of the internal structure of the utility model;

[0019] Figure 4 It is a schematic diagram of the structure of the weighing component of the utility model.

[0020] In the figure: 1. base; 2. fixed support leg; 3. spring support leg; 4. discharge hopper; 5. connecting sleeve; 6. box shell; 7. box cover; 8. feed port; 9. pipeline; 10. mounting rod; 11. telescopic cylinder; 12. motor; 13. rotating shaft; 14. weighing assembly; 15. screen frame; 16. support block; 17. mounting block; 18. screen; 141. weighing block; 142. weighing sensor; 143. groove; 144. connecting block. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Example 1: Reference Figure 1-4 The illustrated one is a weighing and screening integrated coal powder screen with positive and negative pressure, comprising a base 1 and a box shell 6, wherein the base 1 is connected to the box shell 6 via spring legs 3, and an excitation source for driving the box shell 6 to vibrate is provided on the outer wall thereof;

[0023] The box shell 6 is a shell that is transparent at both ends. A box cover 7 is provided on the top of the box shell 6. A feed port 8 and a pipe 9 that are connected to the inside of the box shell 6 are provided on the box cover 7. The pipe 9 is connected to external positive and negative pressure equipment. A cover plate is provided on the feed port 8 to block the feed port 8.

[0024] A screen frame 15 is provided inside the box shell 6. The screen frame 15 is provided with two groups, and a screen mesh 18 is provided on the screen frame 15. The screen mesh 18 is welded on the screen frame 15.

[0025] The bottom of the box shell 6 is connected to the discharge hopper 4 through a connecting sleeve 5, the connecting sleeve 5 is made of rubber, the top of the discharge hopper 4 is connected to the inside of the box shell 6, the bottom of the discharge hopper 4 is provided with a sealing plate, and the discharge hopper 4 is connected to the base 1 through a fixed leg 2; when the positive and negative pressure equipment is working, a positive pressure or a negative pressure can be formed inside the box shell 6 through a pipeline 9 to cooperate with the screening of coal powder;

[0026] The discharge hopper 4 is also provided with a weighing component 14 for weighing the screen frame 15 .

[0027] like Figure 2 As shown, a support block 16 is provided on the outer wall of the screen frame 15, and a mounting rod 10 corresponding to the position of the support block 16 is provided on the inner wall of the box shell 6. When the box shell 6 is working, the screen frame 15 can be driven to vibrate through the mounting rod 10 and the support block 16, thereby driving the screen 18 to vibrate and realizing the screening of coal powder.

[0028] The mounting rod 10 is an L-shaped rod including a horizontal rod and a vertical rod, and the support block 16 is provided with a through hole matched with the size of the vertical rod.

[0029] like Figure 3 and Figure 4 As shown, a rotating shaft 13 is slidably connected to the discharge hopper 4, and the rotating shaft 13 includes an inner part and an outer part. The inner part is provided with a weighing component 14 for weighing the screen frame 15, and the outer part is connected to the output end of the motor 12. The base 1 is also provided with a telescopic cylinder 11 for driving the motor 12 to move in the vertical direction.

[0030] There are two groups of weighing components 14, and the angle between the two groups of weighing components 14 is 90 degrees, that is, when the weighing components 14 weigh one group of screen frames 15, they do not contact the other group of screen frames 15;

[0031] The weighing assembly 14 includes a weighing block 141 and a weighing sensor 142. The weighing block 141 is installed on the rotating shaft 13. A groove 143 is opened on the weighing block 141. The weighing sensor 142 is arranged in the groove 143. A connecting block 144 is also arranged on the weighing sensor 142. The screen frame 15 is provided with a mounting block 17 corresponding to the position of the connecting block 144.

[0032] Working principle of the utility model: when in use, the device is connected to electricity and connected to the external PLC control center, and the opening and closing of the electrical components in the device are controlled by the PLC control center;

[0033] A fixed mass of coal powder is put into the box shell 6 through the feed port 8, and the coal powder falls on the screen 18, closing the feed port 8. At this time, the discharge hopper 4 is in a closed state, and the excitation source is controlled to work, driving the box shell 6 to vibrate. The box shell 6 vibrates on the base 1 under the support of the spring legs 3. The discharge hopper 4 is connected to the base 1 through the fixed legs 2, and a rubber connecting sleeve 5 is provided between the discharge hopper 4 and the box shell 6. The discharge hopper 4 will not vibrate with the box shell 6, and the weighing assembly 14 will not vibrate;

[0034] When the box shell 6 vibrates, the screen frame 15 is driven to vibrate through the mounting rod 10 and the support block 16, so that the electric screen 18 vibrates to screen the coal powder. Through the positive and negative pressure equipment and the pipeline 9, the inside of the box shell 6 is in negative pressure to prevent the coal powder from polluting the working environment.

[0035] After the screening is completed, the motor 12 is controlled to rotate, driving the rotating shaft 13 to rotate, thereby driving the weighing assembly 14 to rotate, so that the connecting block 144 corresponds to the position of the mounting block 17, and the telescopic cylinder 11 is controlled to work and extend, so that the weighing assembly 14 pushes the screen frame 15 upward to separate it from the mounting rod 10, and the measured value is obtained. The mass of the screen frame 15, the screen 18, the mounting block 17, the support block 16 and the connecting block 144 are subtracted to obtain the mass of the screened coal powder, and the experiment is completed.

[0036] The electromechanical connection involved in the present utility model is a common means used by those skilled in the art, and technical inspiration can be obtained through a limited number of tests, which belongs to common knowledge.

[0037] Components not described in detail herein are prior art.

[0038] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A coal powder screen with integrated weighing and screening for positive and negative pressure, characterized in that: It comprises a base (1) and a box shell (6), wherein the base (1) is connected to the box shell (6) via spring legs (3), and an excitation source for driving the box shell (6) to vibrate is provided on the outer wall of the box shell (6); The box shell (6) is a shell body with transparent upper and lower ends, and a box cover (7) is provided on the top of the box shell (6). The box cover (7) is provided with a feed inlet (8) and a pipeline (9) which are connected to the inside of the box shell (6), and the pipeline (9) is connected to external positive and negative pressure equipment; A screen frame (15) is provided inside the box shell (6), the screen frame (15) is provided with a plurality of groups, and a screen mesh (18) is provided on the screen frame (15); The bottom of the box shell (6) is connected to a discharge hopper (4) via a connecting sleeve (5); the top of the discharge hopper (4) is in communication with the interior of the box shell (6); a sealing plate is provided at the bottom of the discharge hopper (4); and the discharge hopper (4) is connected to the base (1) via fixed legs (2); The discharge hopper (4) is also provided with a weighing component (14) for weighing the screen frame (15).

2. The integrated coal powder screen capable of weighing and screening and capable of positive and negative pressure according to claim 1, characterized in that: A support block (16) is provided on the outer wall of the screen frame (15), and a mounting rod (10) corresponding to the position of the support block (16) is provided on the inner wall of the box shell (6).

3. The integrated coal powder screen capable of weighing and screening and capable of positive and negative pressure according to claim 2, characterized in that: The mounting rod (10) is an L-shaped rod comprising a horizontal rod and a vertical rod, and the support block (16) is provided with a through hole matching the size of the vertical rod.

4. The integrated coal powder screen capable of weighing and screening and capable of positive and negative pressure according to claim 1, characterized in that: The discharge hopper (4) is slidably connected to a rotating shaft (13), the rotating shaft (13) comprising an inner portion and an outer portion, the inner portion being provided with a weighing assembly (14) for weighing the screen frame (15), the outer portion being connected to an output end of a motor (12), and the base (1) being further provided with a telescopic cylinder (11) for driving the motor (12) to move in a vertical direction.

5. The integrated coal powder screen capable of weighing and screening and capable of positive and negative pressure according to claim 4, characterized in that: The weighing assembly (14) comprises a weighing block (141) and a weighing sensor (142); the weighing block (141) is mounted on the rotating shaft (13); a groove (143) is formed on the weighing block (141); the weighing sensor (142) is disposed in the groove (143); a connecting block (144) is also disposed on the weighing sensor (142); and the screen frame (15) is provided with a mounting block (17) corresponding to the position of the connecting block (144).