Centrifugal screen for coal dressing

Abstract

The utility model relates to the technical field of coal dressing, and provides a centrifugal screen for coal dressing, which comprises a barrel body (1) and a first rotating rod (2) rotatably connected in the barrel body (1), one end of the first rotating rod (2) penetrates through the barrel body (1) and is fixedly connected with the output end of a first motor (3) arranged on the side wall of the barrel body (1), and the barrel body (1) is provided with a feed port (4) and a discharge port (5). A first spiral blade (6), a separation blade (7) and a second spiral blade (8) are fixedly connected to the first rotating rod (2), and a screen (9) is arranged on the portion, below the separation blade (7), of the barrel (1) in a sliding mode; the vibrating screen further comprises a vibrating mechanism (10), the vibrating mechanism (10) is arranged below the screen (90), the screen can be vibrated, and it is avoided that discharge of water in coal is affected due to blockage of the screen.

Description

Technical Field

[0001] The utility model relates to the technical field of coal preparation, and more specifically, to a centrifugal screen for coal preparation. Background Art

[0002] Coal preparation, also known as coal washing, is the process of separating raw coal into clean coal that meets user quality requirements. Coking coal has certain requirements for ash and sulfur content, and washed clean coal is essential. The coal's petrographic composition, as well as the quantity, type, properties, and distribution of its minerals, all influence its selectivity.

[0003] Patent No. CN216857051 U discloses a centrifugal screen for coal cleaning, belonging to the field of coal mining equipment. The centrifugal screen comprises a centrifugal screen body, a retaining ring provided on the centrifugal screen body, a port provided at the rear end of the centrifugal screen body, two symmetrical fixing members installed at the front end of the centrifugal screen body, a baffle installed on the fixing members, the centrifugal screen body fixedly connected to the baffle via the fixing members, a drive belt provided on the retaining ring, a motor provided at the other end of the drive belt, the centrifugal screen body connected to the motor via the drive belt, the drive belt and the motor forming a transmission assembly, a drive shaft provided at the rear end of the centrifugal screen body, a rotating shaft provided on the drive shaft near the centrifugal screen body, and a stirring shaft fixedly installed at the other end of the rotating shaft. The centrifugal screen can achieve a relatively dry state of the coal, avoid dusting of the coal, and reduce the risk of ignition. At the same time, the separation blades repeatedly grind the crushed coal, achieving the dual functions of dehydration and crushing. However, in the prior art, when the separation blades rotate to crush the coal, solids in the coal easily clog the screen, and the screen clogs prevent the water in the coal from passing through the screen. Utility Model Content

[0004] In order to overcome the above-mentioned shortcomings, the utility model aims to provide a centrifugal screen for coal preparation, which can make the screen vibrate to avoid clogging of the screen and affect the discharge of moisture in the coal.

[0005] A centrifugal screen for coal preparation comprises a cylinder and a first rotating rod rotatably connected to the cylinder, one end of the first rotating rod passes through the cylinder and is fixedly connected to the output end of a first motor installed on the side wall of the cylinder, a feed port and a discharge port are provided on the cylinder, a first spiral blade, a separation blade and a second spiral blade are fixedly connected to the first rotating rod, a screen is slidably provided on the cylinder below the separation blade; and a shaking mechanism is also included, which is arranged below the screen.

[0006] Furthermore, a water collecting tank is provided below the cylinder.

[0007] Furthermore, the shaking mechanism includes a second rotating rod that passes through and is rotatably connected to the water collection trough, and the upper end of the second rotating rod is fixed with a turntable. The upper end surface of the turntable is provided with an annular groove concentric with the turntable, and at least one pair of grooves is provided in a circular array within the annular groove.

[0008] Furthermore, the shaking mechanism also includes two vertical rods fixedly connected to the lower end of the screen, and the lower ends of the vertical rods are embedded with rolling balls.

[0009] Furthermore, the two upright poles are symmetrically arranged along the center line of the turntable and the vertical projections of the two upright poles are both located in the annular groove.

[0010] Furthermore, an inclined surface is provided in the groove, and the inclined surface is located at the junction of the groove and the annular groove.

[0011] Furthermore, a plurality of water holes are provided in the groove.

[0012] Furthermore, the cylinder is provided with an opening below the separation blade, and limiting grooves are provided on both sides of the opening, and both ends of the screen are fixedly connected to limiting blocks.

[0013] Furthermore, the screen is arranged in the opening, and the limiting block slides in the limiting groove.

[0014] Furthermore, at least three separation blades are fixedly connected along the circumference of the first rotating rod, and crushing protrusions are fixedly connected to the separation blades.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] In the utility model, coal is added to the cylinder through the feed port, and the first motor drives the first rotating rod to rotate so that the first spiral blade pushes the coal to the separation blade for crushing. In the process of rotation and crushing of the separation blade, the centrifugal force causes the moisture to be thrown out of the coal, and the gravity causes the moisture to be discharged from the screen. The crushed dry coal is pushed to the discharge port by the second spiral blade for discharge, and the output of the second motor causes the second rotating rod to drive the turntable to rotate, so that the rolling balls repeatedly roll in and out of the rolling grooves, causing the screen to shake up and down, so that the coal debris blocked on the screen is separated from the screen, thereby avoiding the blockage of the screen and affecting the discharge of moisture. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a schematic diagram of the overall structure of a centrifugal screen for coal preparation;

[0019] Figure 2 It is a schematic diagram of the interior of a centrifugal screen used for coal preparation;

[0020] Figure 3 It is a partial structural diagram of a centrifugal screen for coal preparation;

[0021] Figure 4 is a schematic diagram of the shaking mechanism;

[0022] Figure 5 This is a schematic diagram of a turntable.

[0023] In the figure: 1. Cylinder; 2. First rotating rod; 3. First motor; 4. Feed port; 5. Discharge port; 6. First spiral blade; 7. Separation blade; 8. Second spiral blade; 9. Screen; 10. Shaking mechanism; 101. Second rotating rod; 102. Turntable; 103. Annular groove; 104. Groove; 105. Vertical pole; 106. Rolling ball; 107. Second motor; 108. Inclined surface; 109. Water hole; 11. Water collecting trough; 12. Opening; 13. Limiting groove; 14. Limiting block; 15. Crushing protrusion. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Specific embodiment:

[0026] like Figure 1-5As shown, a centrifugal screen for coal preparation includes a cylinder 1, which is fixedly connected to a support leg for supporting the cylinder 1 above the ground, and a first rotating rod 2 is rotatably connected to the cylinder 1 along the length direction, one end of the first rotating rod 2 passes through the side wall of the cylinder 1 and is fixedly connected to the output end of a first motor 3 installed on the side wall of the cylinder 1, and a feed port 4 for adding coal and a discharge port 5 for discharging crushed and dehydrated coal are provided on the cylinder 1, and a first spiral blade 6, a separation blade 7 and a second spiral blade 8 are fixedly connected to the first rotating rod 2, the first spiral blade 6 is arranged on a side close to the feed port 4, the second spiral blade 8 is arranged on a side close to the discharge port 5, and the separation blade 7 is arranged between the first spiral blade 6 and the second spiral blade 8, and the cylinder 1 is located below the separation blade 7 and a screen 9 is slidably provided; it also includes a shaking mechanism 10, which is arranged below the screen 9 and can shake the screen 9 up and down, so that the coal fragments blocked on the screen 9 are separated from the screen 9, thereby reducing the probability of blockage of the screen 9. The first spiral blade 6 is used to push the coal entering from the feed port 4 to the separation blade 7. The separation blade 7 crushes the coal by rotating. At the same time, the moisture in the coal is discharged from the screen 9 during the swinging process of the separation blade 7. The second spiral blade 8 rotates to push the crushed and dehydrated coal to the discharge port 5 for discharge, completing the crushing and dehydration operation of the coal.

[0027] like Figure 1-5 As shown, a water collecting trough 11 is provided below the cylinder 1, and the water collecting trough 11 is located below the screen 9. The lower end of the water collecting trough 11 is fixedly connected with a support leg for supporting the water collecting trough 11 on the ground. The support legs provided on the cylinder 1 and the water collecting trough 11 (screw holes are not shown in the figure) can be fixedly connected to the ground by bolts. The water collecting trough 11 is used to receive the water discharged by the screen 9.

[0028] like Figure 1-5As shown, the shaking mechanism 10 includes a second rotating rod 101 that passes through and is rotatably connected to the water collecting trough 11, and the upper end of the second rotating rod 101 is fixedly connected to a turntable 102. The upper end surface of the turntable 102 is provided with an annular groove 103 concentric with the turntable 102, and the inner circumferential array of the annular groove 103 is provided with at least one pair of grooves 104. The two grooves 104 arranged opposite to each other are a pair. In this embodiment, two pairs of grooves 104 are provided; the shaking mechanism 10 also includes two vertical rods 105 fixedly connected to the lower end of the screen 9, and the lower ends of the two vertical rods 105 are embedded with rolling balls 106; the two vertical rods 105 are symmetrically arranged along the center line of the turntable 102 and the vertical projections of the two vertical rods 105 are both located in the annular groove 103, and the rolling balls 106 can roll in the annular groove 103, and the lower end of the second rotating rod 101 is fixedly connected to the output end of the second motor 107 installed on the water collecting trough 11. As the ball 106 rolls into the groove 104, the screen 9 moves downward. As the ball 106 rolls out of the groove 104, the screen 9 moves upward. The output of the second motor 107 causes the second rotating rod 101 to drive the turntable 102 to rotate, so that the ball 106 repeatedly rolls in and out of the groove 104, causing the screen 9 to shake up and down, so that the coal debris blocked on the screen 9 is broken off from the screen 9, thereby preventing the screen 9 from being blocked and affecting the discharge of moisture.

[0029] like Figure 1-5 As shown, an inclined surface 108 is provided in the groove 104 . The inclined surface 108 is located at the junction of the groove 104 and the annular groove 103 , so that the ball 106 can roll out of or into the groove 104 more smoothly.

[0030] like Figure 1-5 As shown, a plurality of water holes 109 are opened in the groove 104 , and the water holes 109 are connected to the rotating disk 102 so that water falling into the groove 104 can be discharged through the water holes 109 .

[0031] like Figure 1-5 As shown, the cylinder 1 is provided with an opening 12 below the separating blade 7, and the screen 9 is arranged in the opening 12. Limiting grooves 13 arranged along the length direction of the cylinder 1 are provided on both sides of the opening 12. Both ends of the screen 9 are fixedly connected to limiting blocks 14, and the limiting blocks 14 slide in the limiting grooves 13 so that the limiting blocks 14 can slide in the limiting grooves 13 in the vertical direction. The vertical movement of the vertical rod 105 in the shaking mechanism 10 causes the screen 9 to shake and vibrate out the debris blocked on the screen 9.

[0032] like Figure 1-5 As shown, there are at least three separating blades 7 fixedly connected along the circumference of the first rotating rod 2. In this embodiment, four separating blades 7 are provided. A plurality of crushing protrusions 15 are fixedly connected to the separating blades 7 at equal intervals along the length direction of the cylinder 1. The crushing protrusions 15 on two adjacent separating blades 7 are staggered to improve the crushing efficiency of the coal.

[0033] The first motor 3 and the second motor 107 are both electrically connected to an external power source and to a control unit (not shown).

[0034] The working principle of a centrifugal screen for coal preparation in this embodiment is as follows: when in use, coal is added to the cylinder 1 through the feed port 4, and the first motor 3 drives the first rotating rod 2 to rotate so that the first spiral blade 6 pushes the coal to the separation blade 7 for crushing. During the rotation and crushing process of the separation blade 7, the centrifugal force causes the moisture to be thrown out of the coal, and the gravity causes the moisture to be discharged from the screen 9. The crushed dry coal is pushed to the discharge port 5 by the second spiral blade 8 for discharge, and the output of the second motor 107 drives the second rotating rod 101 to drive the turntable 102 to rotate, so that the rolling balls 106 repeatedly roll in and out of the rolling groove 104, causing the screen 9 to shake up and down, so that the coal debris blocked on the screen 9 is separated from the screen 9, thereby preventing the screen 9 from being blocked and affecting the discharge of moisture.

[0035] Finally, it should be noted that the above description is merely 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 will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A centrifugal screen for coal preparation, characterized by: The invention comprises a cylinder (1) and a first rotating rod (2) rotatably connected to the cylinder (1), one end of the first rotating rod (2) passes through the cylinder (1) and is fixedly connected to the output end of a first motor (3) installed on the side wall of the cylinder (1), the cylinder (1) is provided with a feed port (4) and a discharge port (5), the first rotating rod (2) is fixedly connected with a first spiral blade (6), a separation blade (7) and a second spiral blade (8), the cylinder (1) is located below the separation blade (7) and is provided with a screen (9) for sliding; the invention also comprises a shaking mechanism (10), the shaking mechanism (10) is provided below the screen (9) A water collecting trough (11) is provided below the cylinder (1), and the shaking mechanism (10) includes a second rotating rod (101) which passes through and is rotatably connected to the water collecting trough (11), and a turntable (102) is fixedly connected to the upper end of the second rotating rod (101), and an annular groove (103) which is concentric with the turntable (102) is provided on the upper end surface of the turntable (102), and at least one pair of grooves (104) are provided in an inner circumferential array of the annular groove (103), and the shaking mechanism (10) further includes two vertical rods (105) which are fixed to the lower end of the screen (9), and a rolling ball (106) is embedded in the lower end of the vertical rod (105).

2. A centrifugal screen for coal preparation according to claim 1, characterized in that: The two vertical rods (105) are symmetrically arranged along the center line of the rotating disk (102), and the vertical projections of the two vertical rods (105) are both located in the annular groove (103).

3. A centrifugal screen for coal preparation according to claim 1, characterized in that: An inclined surface (108) is provided in the groove (104), and the inclined surface (108) is located at the junction of the groove (104) and the annular groove (103).

4. A centrifugal screen for coal preparation according to claim 1, characterized in that: A plurality of water holes (109) are provided in the groove (104).

5. The centrifugal screen for coal preparation according to claim 1, characterized in that: The cylinder (1) is provided with an opening (12) below the separating blade (7), and limiting grooves (13) are provided on both sides of the opening (12). Both ends of the screen (9) are fixedly connected to limiting blocks (14).

6. A centrifugal screen for coal preparation according to claim 5, characterized in that: The screen (9) is arranged in the opening (12), and the limiting block (14) slides in the limiting groove (13).

7. The centrifugal screen for coal preparation according to claim 1, characterized in that: At least three separation blades (7) are fixedly connected to the first rotating rod (2) in the circumferential direction, and a crushing protrusion (15) is fixedly connected to the separation blades (7).

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