Bypass damper and coal screen

Abstract

The present disclosure relates to a bypass baffle and a coal screening machine, the bypass baffle comprising a frame and a plurality of baffle strips, each baffle strip having two ends connected to two opposite side portions of the frame, and adjacent two baffle strips being spaced apart along an upward direction, and a spacing region being formed between the adjacent two baffle strips for allowing the coal powder to pass through; an electric push rod is used to drive the bypass baffle to swing so that the bypass baffle has a first state and a second state, in the first state, the bypass baffle blocks above the bypass outlet, each baffle strip extends along the upward direction, and the spacing region between the adjacent two baffle strips is used to allow the coal powder to fall into the bypass outlet; in the second state, the bypass baffle blocks the coal inlet of the screening shaft assembly, each baffle strip extends downwardly and obliquely, and the projection of each spacing region along the upward direction is covered by the projection of the baffle strip above the spacing region along the upward direction, so as to prevent the coal powder from entering the coal inlet of the screening shaft assembly from the spacing region.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of coal screening machines, in particular, to a bypass baffle and a coal screening machine. BACKGROUND

[0002] In order to improve the crushing efficiency of the coal crusher and save energy consumption, screening is required before crushing raw coal, and the coal screening machine plays an important role, and its screening capacity per unit time directly affects the supply of burning coal.

[0003] In the prior art with publication number CN106975593A, a roller shaft coal screening machine is disclosed, which comprises a body, an electric push rod, a baffle, a coal inlet and a bypass outlet. The baffle is located below the coal inlet and is hinged to the two side walls of the body. The electric push rod is connected to the lever at the hinged point on one side outside the body, and the electric push rod drives the baffle to control the flow direction of the coal. When the screen shaft assembly needs to be withdrawn due to failure, the baffle can be covered above the entrance of the screen shaft assembly, and the coal will directly enter the bypass outlet without screening, which will affect the screening effect of the coal powder and further affect the combustion efficiency of the coal powder. SUMMARY

[0004] The purpose of the present disclosure is to provide a bypass baffle and a coal screening machine to solve the technical problems existing in the related art.

[0005] In order to achieve the above-mentioned purpose, the first aspect of the present disclosure provides a bypass baffle, comprising a frame and a plurality of baffle strips, both ends of each baffle strip are connected to two opposite side parts of the frame, and adjacent two baffle strips are spaced apart along the upward direction, and a spacing area is formed between adjacent two baffle strips, which is used for allowing the coal powder to pass through.

[0006] The lower end of the bypass baffle is connected to an electric push rod, and the electric push rod is used to drive the bypass baffle to swing so that the bypass baffle has a first state and a second state. In the first state, the bypass baffle blocks above the bypass outlet, each baffle strip extends along the upward direction, and the spacing area between adjacent two baffle strips is used for allowing the coal powder to fall into the bypass outlet. In the second state, the bypass baffle blocks the coal inlet of the screen shaft assembly, each baffle strip extends downwardly and inclinedly, and the projection of each spacing area in the upward direction is covered by the projection of the baffle strip above it in the upward direction, so as to prevent the coal powder from entering the coal inlet of the screen shaft assembly from the spacing area.

[0007] Optionally, the baffle strip is rotatably connected to the frame.

[0008] Optionally, the blocking strip comprises a blocking piece and a hinged shaft, the hinged shaft is connected to one side of the blocking piece, the inner side of the two opposite edge portions of the frame is formed with a hinged hole, and the first end and the second end of the hinged shaft are respectively rotatably arranged in the corresponding hinged hole.

[0009] Optionally, the blocking strip further comprises a limiting piece, the limiting piece is connected to the side of the blocking piece away from the hinged shaft and is arranged in a protruding manner away from the blocking piece, so that the limiting piece is overlapped on the edge portion of the frame when the bypass blocking plate is in the second state.

[0010] Optionally, each blocking strip is welded to the edge portion of the frame.

[0011] Optionally, the width of the spacing area and the width of the blocking strip gradually increase along the direction from top to bottom.

[0012] Optionally, in the first state, the angle between the blocking strip and the horizontal plane gradually increases along the direction from top to bottom.

[0013] Optionally, in the first state, the inclination angle between the blocking strip and the frame is 40°-50°.

[0014] The second aspect of the present disclosure provides a coal screening machine, comprising an electric push rod and a bypass blocking plate as described above, the bypass blocking plate is connected with the electric push rod, and the electric push rod is used to push the bypass blocking plate to swing, so that the bypass blocking plate has the first state and the second state.

[0015] Optionally, the coal screening machine further comprises a shaft end vibrator, the shaft end vibrator is connected between the electric push rod and the bypass blocking plate and is used to drive the bypass blocking plate to vibrate when the bypass blocking plate is in the first state.

[0016] By the technical scheme, the plurality of baffle strips are arranged on the frame of the bypass baffle and are spaced apart in the upward direction, and the bypass baffle has the first state and the second state under the driving of the electric push rod. In this way, when the coal screen is in normal operation, the electric push rod can drive the bypass baffle to swing so that the bypass baffle is in the first state. At this time, the coal powder entering the coal screen can enter the screen shaft assembly through the coal inlet, and can also enter the bypass outlet after being screened through the interval area between the baffle strips, thereby improving the screening efficiency of the entire device and achieving better screening effect. When the screen shaft assembly needs to be repaired or maintained, the bypass baffle can be driven to the second state by the electric push rod. At this time, the projection of each interval area in the upward direction is covered by the projection of the baffle strip above it in the upward direction, that is, in the second state, the baffle strip can cover the interval area, thereby avoiding the coal powder from entering the screen shaft assembly through the interval area and playing a blocking role on the coal powder. The coal powder can directly fall onto the downstream conveying belt through the bypass outlet at this time.

[0017] That is, the bypass baffle can be used to shield and filter the coal powder at the same time, which improves the screening effect and efficiency of the coal powder, simplifies the overall structure of the coal screen, and has good practicability.

[0018] Other features and advantages of the present disclosure will be described in detail in the following detailed description section. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation on the present disclosure. In the drawings:

[0020] Figure 1 is a partial structure schematic view of a coal screen provided by an exemplary embodiment of the present disclosure, in which the bypass baffle is in the first state;

[0021] Figure 2 is a partial structure schematic view of a coal screen provided by an exemplary embodiment of the present disclosure, in which the bypass baffle is in the second state;

[0022] Figure 3 is a three-dimensional structure schematic view of a bypass baffle provided by an exemplary embodiment of the present disclosure, in which the baffle strip is hinged to the frame, and the bypass baffle is in the first state;

[0023] Figure 4 is an enlarged schematic view of part A of Figure 3

[0024] Figure 5 ​is a schematic view of a bypass baffle three-dimensional structure provided by another exemplary embodiment of the present disclosure, wherein the bypass baffle is in a first state, and the blocking strips are welded to the frame;

[0025] Figure 6 is a schematic view of a bypass baffle three-dimensional structure provided by an exemplary embodiment of the present disclosure, wherein the bypass baffle is in a second state.

[0026] Legend of reference signs

[0027] 1 - bypass baffle; 10 - frame; 101 - hinged hole; 20 - blocking strip; 200 - spacing area; 201 - blocking piece; 202 - hinged shaft; 203 - limiting piece; 2 - electric push rod; 3 - bypass outlet; 4 - screen shaft assembly; 5 - coal inlet; 6 - conveying belt; 100 - coal screening machine. DETAILED DESCRIPTION

[0028] The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0029] In the present disclosure, the orientation words such as "up-down direction" are generally defined based on the normal use state of the coal screening machine, and specifically, the drawing surface direction shown in FIGS. Figure 1 and Figure 2 may be referred to. "Inner and outer" refer to the inner and outer contours of the relevant components. In addition, it should be noted that the terms such as "first" and "second" are used to distinguish one element from another element, and do not have sequential and important meanings. In addition, in the description with reference to the drawings, the same reference signs in different drawings represent the same elements.

[0030] Reference Figures 1 to 6As shown, the first aspect of the present disclosure provides a bypass baffle 1, comprising a frame 10 and a plurality of baffle strips 20, both ends of each baffle strip 20 are connected with two opposite edge parts of the frame 10 respectively, adjacent two baffle strips 20 are arranged at intervals along the up-to-down direction, and a spacing area 200 is formed between the adjacent two baffle strips 20, the spacing area 200 is used for the passage of pulverized coal; the lower end of the bypass baffle 1 is connected with an electric push rod 2, the electric push rod 2 is used to drive the bypass baffle 1 to swing so that the bypass baffle 1 has a first state and a second state, in the first state, the bypass baffle 1 shields above the bypass outlet 3, each baffle strip 20 extends along the up-to-down direction, and the spacing area 200 between the adjacent two baffle strips 20 is used for the pulverized coal to fall into the bypass outlet 3; in the second state, the bypass baffle 1 shields the coal inlet 5 of the screen shaft assembly 4, each baffle strip 20 extends downwardly and obliquely, and the projection of each spacing area 200 along the up-to-down direction is covered by the projection of the baffle strip 20 above it along the up-to-down direction, so as to prevent the pulverized coal from entering the coal inlet 5 of the screen shaft assembly 4 from the spacing area 200.

[0031] Through the above technical solution, by arranging a plurality of baffle strips 20 on the frame 10 of the bypass baffle 1 and spaced in the up-to-down direction, and the bypass baffle 1 can have a first state and a second state under the drive of the electric push rod 2, so that when the coal screen 100 is normally running, the electric push rod 2 can drive the bypass baffle 1 to swing so that the bypass baffle 1 is in the first state, at this time, the pulverized coal entering the coal screen 100 can enter the screen shaft assembly 4 through the coal inlet 5, and also enter the bypass outlet 3 after screening through the spacing area 200 between the baffle strips 20, thereby improving the screening efficiency of the entire device and achieving better screening effect; when the screen shaft assembly 4 needs to be repaired or maintained, the bypass baffle 1 can be driven to the second state by the electric push rod 2, at this time, since the projection of each spacing area 200 along the up-to-down direction is covered by the projection of the baffle strip 20 above it along the up-to-down direction, that is, in the second state, the baffle strip 20 can cover the spacing area 200, thereby avoiding the pulverized coal from entering the screen shaft assembly 4 through the spacing area 200, and playing a blocking role on the pulverized coal, which can directly fall onto the downstream conveying belt 6 through the bypass outlet 3.

[0032] That is, by arranging a bypass baffle 1, the shielding and filtering of the pulverized coal can be realized at the same time, which improves the screening effect and efficiency of the pulverized coal, simplifies the overall structure of the coal screen 100, and has good practicability.

[0033] In order to facilitate the adjustment of the bypass baffle 1 between the first state and the second state, the baffle strip 20 covers and screens the spacing area 200, optionally, as shown in the drawings, Figure 3 , Figure 4As shown, the blocking strips 20 are rotatably connected to the frame 10. In this way, when the bypass baffle 1 is adjusted to the first state, since the blocking strips 20 are rotatably connected to the frame 10, each blocking strip 20 is vertically arranged under the action of its own gravity, and at this time, the projection of the blocking strip 20 in the up-down direction does not block the projection of the spacing area 200 in the up-down direction, so as not to affect the passage of the coal powder from the spacing area 200; when the bypass baffle 1 is in the second state, under the action of its own gravity, the blocking strip 20 can be rotated above the spacing area 200, thereby achieving the covering of the spacing area 200, so as to avoid the coal powder passing through the spacing area 200 into the coal inlet 5 of the screen shaft assembly 4, thereby affecting the maintenance or maintenance of the screen shaft assembly 4.

[0034] Specifically, in an example embodiment provided by the present disclosure, as shown in Figure 3 , Figure 4 , the blocking strip 20 can include a blocking piece 201 and a hinge shaft 202, the hinge shaft 202 is connected to one side of the blocking piece 201, the inner side of the two opposite edge portions of the frame 10 is formed with a hinge hole 101, and the first end and the second end of the hinge shaft 202 are rotatably arranged in the corresponding hinge hole 101. In this way, when the electric push rod 2 drives the bypass baffle 1 to swing, the blocking piece 201 can automatically swing around the hinge shaft 202 relative to the edge portion of the frame 10 under the action of its own gravity, for example, when the electric push rod 2 drives the bypass baffle 1 to the first state, each blocking strip 20 rotates around the hinge hole 101 under the action of gravity and naturally falls, so that the blocking strip 20 does not block the spacing area 200, and the coal powder meeting the particle size requirement can pass through, thereby achieving the filtration of the coal powder; when the electric push rod 2 drives the bypass baffle 1 to the second state, the upper blocking strip 20 of the two adjacent blocking strips 20 can rotate around the hinge hole 101 under the action of gravity and lap on the lower blocking strip 20, thereby achieving the covering of the spacing area 200 and the blocking of the coal powder.

[0035] Optionally, as shown in Figure 3 , Figure 4 , the blocking strip 20 can further include a limiting piece 203, the limiting piece 203 is connected to the side of the blocking piece 201 away from the hinge shaft 202 and is protrudingly arranged away from the blocking piece 201, so that the limiting piece 203 laps on the edge portion of the frame 10 when the bypass baffle 1 is in the second state. In this way, by arranging the limiting piece 203, the limiting piece 203 can lap on the frame 10 when the bypass baffle 1 is in the second state, thereby limiting the position of the blocking piece 201, so as to avoid the problem that the blocking piece 201 is affected by the gravity or pressure of the coal powder and enters the spacing area 200 during the process of blocking the coal powder.

[0036] Alternatively, in another exemplary embodiment provided by the present disclosure, when the bypass damper 1 is in the first state, the size of each baffle 20 located upstream of each interval region 200 is greater than that of each interval region 200, so that the bypass damper 1 can ensure that, when in the first state, both ends of each baffle 20 are lapped on the frame 10, and the lower end of each baffle 20 is lapped on the adjacent baffle 20 (the lowermost baffle 20 is lapped on the frame 10).

[0037] Alternatively, in order to improve the strength and stability of the bypass damper 1, the baffle 20 can be connected to the edge of the frame 10 in a non-detachable manner, for example, as shown in an exemplary embodiment provided by the present disclosure, each baffle 20 can be welded to the edge of the frame 10. Figure 4 、 Figure 5 Alternatively, in order to improve the strength and stability of the bypass damper 1, the baffle 20 can be connected to the edge of the frame 10 in a non-detachable manner, for example, as shown in an exemplary embodiment provided by the present disclosure, each baffle 20 can be welded to the edge of the frame 10.

[0038] For the embodiment in which the baffle 20 is connected to the frame 10 in a non-detachable manner, the baffle 20 can be integrally formed with the frame 10.

[0039] It should be noted that for the embodiment in which the baffle 20 is connected to the frame 10 in a non-detachable manner, since the relative position between the baffle 20 and the frame 10 remains fixed in the first state and the second state, it is not necessary to additionally provide the limiting member 203 for limiting the baffle 20.

[0040] Optionally, the width of the interval region 200 and the width of the baffle 20 gradually increase along the direction from top to bottom. It should be noted that during the feeding process, the coal powder is gathered below the baffle 20 under the action of gravity, that is, the coal powder located in the lower part of the bypass damper 1 is always more than the coal powder located in the upper part of the bypass damper 1. Based on this, the size of the interval region 200 gradually increases in the upward and downward direction, which is more convenient for the rapid filtration and dredging of the coal powder located in the lower part, thereby reducing or avoiding the problem of accumulation and blockage during the filtration of the coal powder, so as to improve the filtration efficiency. On the other hand, the width of the baffle 20 gradually increases along the direction from top to bottom, which can be adapted to the interval region 200 with gradually increasing size in the direction from top to bottom, thereby improving the covering effect of the interval region 200, so as to avoid the problem that the coal powder falls from the interval region 200 into the coal inlet 5 of the screen shaft assembly 4 when the bypass damper 1 is in the second state.

[0041] Optionally, in the first state, the angle between the baffle 20 and the horizontal plane gradually increases in the direction from top to bottom. During the process of the coal powder entering the bypass outlet 3, on the one hand, the baffle 20 located below can be closer to the interval area 200 located below, and the covering effect of the interval area 200 is better, so that the coal blocking effect is better; on the other hand, when the bypass damper 1 is switched to the second state, the baffle 20 can avoid interfering or interfering with the passing of the coal powder in the interval area 200, so as to ensure the smooth passing of the coal powder.

[0042] In the present disclosure, in order to ensure that the bypass damper 1 can better block the coal powder in the first state, optionally, in the first state, the inclination angle between the baffle 20 and the frame 10 is 40°-50°. Within this angle range, when the coal powder falls from above, the baffle 20 located above can partially block the baffle 20 located below, thereby covering the interval area 200 between the upper and lower baffles 20, and avoiding the coal powder from leaking from the interval area 200 between the baffle 20 and the baffle 20.

[0043] In an exemplary embodiment provided in the present disclosure, the inclination angle between the baffle 20 and the frame 10 can be 45°.

[0044] The second aspect of the present disclosure provides a coal screening machine 100, which comprises an electric push rod 2 and a bypass damper 1 as above, the bypass damper 1 is connected with the electric push rod 2, and the electric push rod 2 is used to push the bypass damper 1 to swing, so that the bypass damper 1 has a first state and a second state.

[0045] Optionally, the coal screening machine 100 can further comprise a shaft end vibrator connected between the electric push rod 2 and the bypass damper 1, and used to drive the bypass damper 1 to vibrate when the bypass damper 1 is in the first state. By arranging the shaft end vibrator between the electric push rod 2 and the bypass damper 1, when the bypass damper 1 is in the first state, the electric push rod 2 can drive the bypass damper 1 to vibrate, so that the coal powder falling on the bypass damper 1 can more easily fall onto the downstream conveying belt 6 through the interval area 200, thereby improving the coal screening effect and efficiency of the bypass damper 1.

[0046] The preferred embodiments of the present disclosure are described in detail above with reference to the drawings, but the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0047] It should be further noted that various specific technical features described in the above specific embodiments can be combined in any suitable manner, and the disclosure will not be repeated here for various possible combinations.

[0048] In addition, various different embodiments of the disclosure can also be combined with each other as long as they do not contradict the idea of the disclosure, and they should also be considered as disclosed by the disclosure.

Claims

1. A bypass damper, characterized by The frame and the plurality of baffle strips, two ends of each of the baffle strips are rotatably connected with two opposite edge portions of the frame, along the direction from top to bottom, two adjacent baffle strips are spaced apart, and a spacing area is formed between the two adjacent baffle strips, the spacing area is used for passing the pulverized coal; The lower end of the bypass baffle is connected with an electric push rod, the electric push rod is used to drive the bypass baffle to swing to have a first state and a second state, in the first state, the bypass baffle blocks above the bypass outlet, each baffle strip extends along the up-down direction, the pulverized coal can enter into the sieve shaft assembly through the coal inlet, or the pulverized coal can enter into the bypass outlet after being screened through the spacing area between the baffle strips; In the second state, the bypass baffle blocks the coal inlet of the sieve shaft assembly, each baffle strip extends downwardly and obliquely, and the projection of each spacing area in the up-down direction is covered by the projection of the baffle strip above it in the up-down direction, so as to prevent the pulverized coal from entering into the coal inlet of the sieve shaft assembly from the spacing area; The baffle strip includes a baffle piece and a hinge shaft, the hinge shaft is connected to one side of the baffle piece, the inner side of the two opposite edge portions of the frame is formed with a hinge hole, the first end and the second end of the hinge shaft are rotatably arranged in the corresponding hinge hole; The baffle strip further includes a limiting piece, the limiting piece is connected to the side of the baffle piece away from the hinge shaft and is protrudingly arranged away from the baffle piece, so that the limiting piece overlaps on the edge portion of the frame when the bypass baffle is in the second state.

2. The bypass damper of claim 1, wherein, Along the direction from top to bottom, the width of the spacing area and the width of the baffle strip gradually increase.

3. The bypass damper of claim 1, wherein, In the first state, the angle between the baffle strip and the horizontal plane gradually increases along the direction from top to bottom.

4. The bypass damper of claim 1, wherein, In the first state, the inclination angle between the baffle strip and the frame is 40°-50°.

5. A coal screen, characterized in that The coal screening machine further includes an electric push rod and the bypass baffle according to any one of claims 1-4, the bypass baffle is connected with the electric push rod, and the electric push rod is used to drive the bypass baffle to swing to have the first state and the second state.

6. The coal screen according to claim 5, characterized in that The coal screening machine further includes a shaft end vibrator, the shaft end vibrator is connected between the electric push rod and the bypass baffle and is used to drive the bypass baffle to vibrate when the bypass baffle is in the first state.

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