A support device for increasing the service life of the lower screen of coal powder screen

Abstract

The utility model discloses a support device for improving the service life of the lower screen of a coal powder screen, and belongs to the technical field of screening solid materials. The support device includes a fixed plate, a movable plate and a support plate. A fixed plate is welded on both sides of the middle of the upper screen frame, and a height-adjustable movable plate is connected below each fixed plate. The support plate is fixed between the bottom surfaces of the two movable plates, and the bottom surface of the support plate abuts against the middle of the top surface of the lower screen. The support device of the utility model adjusts the height of the movable plate so that the bottom surface of the support plate abuts against the middle of the top surface of the lower screen, so that the lower screen between the two support seats forms a concave arc surface, thereby preventing the middle position of the lower screen from abnormally folding due to the up and down vibration of the vibrating screen, resulting in breakage.

Description

Technical Field

[0001] The utility model relates to the technical field of screening solid materials, and more specifically refers to a supporting device for improving the service life of a lower screen of a coal powder screen. Background Art

[0002] A pulverized coal vibrating screen is installed below the pulverized coal bin in the ironmaking coal injection area to screen the ground pulverized coal and remove debris and large particles of raw coal in the pulverized coal to prevent them from entering the injection system, causing blockage in the injection pipeline and reducing the injection efficiency.

[0003] like Figure 1 As shown, the existing coal powder screen is usually equipped with an upper screen 1 and a lower screen 2, and the screen material is stainless steel. The particle size of the upper screen 1 is 10*10mm, and the particle size of the lower screen 2 is 3*3mm. The upper screen 1 of the coal powder screen has a larger particle size, the coal powder is screened faster, and the upper screen 1 is less loaded. The lower screen 2 has a smaller particle size, the coal powder is screened slower, and the coal powder will accumulate to a certain extent. The middle part of the lower screen 2 is more loaded, and only two rows of long strip-shaped support seats 201 are arranged on both sides of the middle bottom surface of the lower screen 2. The rigidity of the screen supported by the two support seats 201 is not enough to bear the weight of the accumulated coal powder. Therefore, with the vibration of the screen body, the middle part of the lower screen 2 will have a certain amplitude of up and down, so that the two sides of the middle part of the lower screen 2 and the support seat 201 will fold back and forth, resulting in abnormal fracture in the middle part of the lower screen (no obvious wear and tear occurs on other parts of the screen). To this end, we proposed an improvement to the coal powder screen so that the middle part of the lower screen will not bend and break due to the up and down floating of the vibrating screen. Utility Model Content

[0004] The utility model provides a supporting device for improving the service life of the lower screen of a coal powder screen, and its main purpose is to overcome the disadvantages that the middle part of the lower screen of the existing coal powder screen vibrates up and down with a certain amplitude as the screen body vibrates, resulting in abnormal breakage of the middle part of the lower screen.

[0005] The utility model adopts the following technical solutions:

[0006] A support device for improving the service life of the lower screen of a coal powder screen comprises a fixed plate, a movable plate and a support plate, wherein a fixed plate is welded to both sides of the middle of an upper screen frame, a height-adjustable movable plate is connected below each fixed plate, the support plate is fixed between the bottom surfaces of the two movable plates, the bottom surface of the support plate abuts against the middle of the top surface of the lower screen, so that the lower screen between the two support seats forms a concave arc surface, and the lower screen does not bend up and down with the vibration of the vibrating screen.

[0007] Specifically, the fixed plate has two first connection holes spaced apart from each other, the movable plate has two second connection holes correspondingly, a connecting screw is passed between the first connection hole and the second connection hole, and a fastening nut is respectively provided on the upper and lower end faces of the first connection hole and the second connection hole.

[0008] In a preferred embodiment, a thread adjustment section is reserved at the bottom of each connecting screw.

[0009] In a preferred embodiment, a rubber strip is clamped on the bottom surface of the support plate, and the lower part of the longitudinal cross-section of the rubber strip is in an arc shape.

[0010] In a preferred embodiment, a connecting plate is respectively provided on the top surfaces of both ends of the supporting plate, and the top surface of each connecting plate is respectively welded to the bottom surface of the movable plate.

[0011] From the above description of the structure of the utility model, it can be seen that compared with the prior art, the utility model has the following advantages:

[0012] 1. The utility model sets a support device in the middle of the top surface of the lower screen, including a fixed plate, a movable plate and a support plate. The fixed plate is welded to both sides of the middle of the upper screen frame. The movable plate is connected below the fixed plate and its height is adjustable, and the support plate is fixed between the bottom surfaces of the two movable plates. By adjusting the height of the movable plate, the bottom surface of the support plate is against the middle of the top surface of the lower screen, so that the lower screen between the two support seats forms a concave arc surface, which prevents the middle position of the lower screen from abnormal folding due to the up and down vibration of the vibrating screen, resulting in breakage.

[0013] 2. In the support device of the utility model, the movable plate is connected to the fixed plate by a connecting screw, and a threaded adjustment section is reserved at the lower part of the connecting screw, which can be used to adjust the height of the support seat, ensure the positioning effect of the lower screen and facilitate adjustment according to the use status of the screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the front view of the existing coal powder screen.

[0015] Figure 2 It is the front view of the utility model.

[0016] Figure 3 It is a side view of the utility model.

[0017] Figure 4 It is the installation front view of the utility model. DETAILED DESCRIPTION

[0018] The specific implementation of the present invention is described below with reference to the accompanying drawings. In order to fully understand the present invention, many details are described below, but for those skilled in the art, the present invention can be implemented without these details. For well-known components, methods and processes, they are not described in detail below.

[0019] A support device for increasing the service life of the lower screen of the coal powder screen, referring to Figure 2 and Figure 4 , including a fixed plate 10, a movable plate 20 and a support plate 30. A fixed plate 10 is welded to both sides of the middle of the frame of the upper screen 1, and a height-adjustable movable plate 20 is connected below each fixed plate 10.

[0020] Specifically, refer to Figure 2 The fixed plate 10 is provided with two first connection holes 100 at intervals, and the movable plate 20 is provided with two second connection holes 200 correspondingly. A connection screw 21 is passed between the first connection hole 100 and the second connection hole 200. A fastening nut 22 is respectively provided on the upper and lower end surfaces of the first connection hole 100, and a fastening nut 22 is also respectively provided on the upper and lower end surfaces of the second connection hole 200.

[0021] Reference Figure 3 and Figure 4 The support plate 30 is fixed between the bottom surfaces of the two movable plates 20. Specifically, a connecting plate 31 is respectively provided on the top surfaces of both ends of the support plate 30, and the top surface of each connecting plate 31 is respectively welded to the bottom surface of the movable plate 20. The bottom surface of the support plate 30 is against the middle of the top surface of the lower screen 2, so that the lower screen 2 between the two support seats 201 forms a concave arc surface.

[0022] Reference Figure 2 and Figure 4 The thickness of the support plate 30 is preferably 10 mm, and the height difference between the top of the fixed plate 10 and the lower screen 2 is about 166 mm. A threaded adjustment section is reserved at the bottom of each connecting screw 22 for adjusting the height of the support plate to ensure the positioning effect of the lower screen 2 and facilitate adjustment according to the use status of the lower screen 2. After the support device is installed in place, the screen does not bend up and down with the vibration of the vibrating screen.

[0023] Reference Figure 2 and Figure 4 A rubber strip 32 is clamped on the bottom surface of the support plate 30 , and the lower part of the longitudinal cross-section of the rubber strip 32 is arc-shaped to prevent the support plate 30 from directly contacting the lower screen 2 and damaging the lower screen 2 .

[0024] The above is only a specific implementation method of the utility model, but the design concept of the utility model is not limited to this. Any non-substantial changes to the utility model using this concept shall be deemed as an infringement of the protection scope of the utility model.

Claims

1. A supporting device for increasing the service life of the lower screen of a coal powder screen, characterized in that: It includes a fixed plate, a movable plate and a support plate. A fixed plate is welded on both sides of the middle part of the upper screen frame. A height-adjustable movable plate is connected under each fixed plate. The support plate is fixed between the bottom surfaces of the two movable plates. The bottom surface of the support plate is against the middle of the top surface of the lower screen, so that the lower screen between the two support seats forms a concave arc surface, and the lower screen does not bend up and down with the vibration of the vibrating screen.

2. A supporting device for increasing the service life of the lower screen of a coal powder screen as claimed in claim 1, characterized in that: The fixed plate is provided with two first connection holes at intervals, and the movable plate is provided with two second connection holes correspondingly. A connection screw is passed between the first connection hole and the second connection hole, and a fastening nut is respectively provided on the upper and lower end surfaces of the first connection hole and the second connection hole.

3. A supporting device for increasing the service life of the lower screen of a coal powder screen as claimed in claim 2, characterized in that: A thread adjustment section is reserved at the lower part of each connecting screw.

4. A supporting device for increasing the service life of the lower screen of a coal powder screen as claimed in claim 1, characterized in that: A rubber strip is clamped on the bottom surface of the support plate, and the lower part of the longitudinal cross section of the rubber strip is in an arc shape.

5. A supporting device for increasing the service life of the lower screen of a coal powder screen as claimed in claim 1, characterized in that: A connecting plate is respectively provided on the top surfaces of both ends of the support plate, and the top surface of each connecting plate is respectively welded to the bottom surface of the movable plate.

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