A drum desliming screen

Abstract

The utility model discloses a kind of drum desliming screens, including support;Support: its inside is rotatably connected with cylindrical rolling screen between front and back, cylindrical rolling screen is set to low front high back inclination, the inside fixed connection of cylindrical rolling screen has drum screen, the screen of cylindrical rolling screen is 30 mesh;Wherein: the front end of support is equipped with internal water pipe, the rear end of internal water pipe is inside the inside of drum screen, the front end upside of support is equipped with external water pipe, external water pipe is located in the upside of cylindrical rolling screen, this drum desliming screen, by low front high inclination cylindrical rolling screen and inside drum screen form classification screening structure, cooperate the atomization water spray design of internal and external water pipe, can efficiently separate 30 mesh or less fine dust, simultaneously can avoid screen hole to be blocked by dust, reduce shutdown cleaning frequency, improve production efficiency and reduce cost.

Description

Technical Field

[0001] This utility model relates to the field of coal washing and beneficiation technology, specifically to a drum desliming screen. Background Technology

[0002] In the process of coal resource development and utilization, coal washing is a key link to improve coal quality and remove impurities. With the continuous improvement of industrial production requirements for coal quality and the increasing scale of coal resource mining, how to efficiently deslim coal has become an important problem that needs to be solved in the field of coal washing technology. In particular, when dealing with fine dust, traditional desliming screen technology faces many challenges, and a more efficient and reliable desliming screen equipment is urgently needed to meet production needs.

[0003] Currently, in the coal washing industry, commonly used desliming screens mainly include vibrating screens and fixed screens. Vibrating screens use mechanical vibration to make coal materials reciprocate on the screen surface, thereby separating coarse and fine particles. Fixed screens rely on the gravity of the coal materials themselves to make them pass through a fixed screen to complete the screening. These traditional desliming screens can play a certain role in processing larger coal particles, but when dealing with smaller dust particles, especially fine dust below 30 mesh, their screening effect is greatly reduced. On the one hand, the small particle size of fine dust makes it easy to form agglomerates on the screen surface, clogging the screen holes and causing a significant reduction in screening efficiency. On the other hand, because the screen holes are easily clogged by dust, the screen needs to be stopped frequently for cleaning. This not only increases the labor intensity of workers, but also seriously affects production efficiency, prolongs the production cycle, and increases production costs. Therefore, we propose a drum desliming screen. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the existing defects and provide a drum desliming screen. The cylindrical rotating screen and the internal drum screen form a grading and screening structure. With the atomization spray design of the internal and external water pipes, it can effectively solve the problems in the background technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a drum desliming screen, including a support frame;

[0006] Support frame: It has a cylindrical rotating screen that is rotatably connected between the front and back. The cylindrical rotating screen is inclined with the front lower and the back higher. A drum screen is fixedly connected inside the cylindrical rotating screen.

[0007] The support frame has an internal water pipe at its front end, with the rear end of the internal water pipe extending into the interior of the drum screen. An external water pipe is located on the upper side of the front end of the support frame, positioned above the cylindrical drum screen. The inclined cylindrical drum screen, with its lower front and higher rear, forms a grading and screening structure with the internal drum screen. Combined with the atomized water spray design of the internal and external water pipes, it can efficiently separate fine dust particles smaller than a certain mesh size. At the same time, it can prevent the screen holes from being clogged by dust, reduce the frequency of downtime for cleaning, improve production efficiency, and reduce costs.

[0008] Furthermore, a control switch is provided on the right side of the bracket, and the input terminal of the control switch is electrically connected to an external power source for stable control.

[0009] Furthermore, the support is provided with drive wheels at both the front and rear ends, and the outer arc surfaces at both the front and rear ends of the cylindrical rotating screen are provided with drive rings. The annular groove in the middle of the drive ring contacts the outer arc surfaces of the adjacent drive wheels on the left and right, so that the cylindrical rotating screen rotates.

[0010] Furthermore, the bracket has a drive shaft rotatably connected to both the left and right sides between the front and rear ends, and the drive wheel is fixedly connected to the front and rear ends of the drive shaft to facilitate the rotation of the drive wheel.

[0011] Furthermore, gearboxes are provided on both the left and right rear ends of the bracket. The output shafts of the gearboxes are fixedly connected to the center of the rear end face of the adjacent front drive shaft. Motors are provided on both the left and right rear ends of the bracket. The output shafts of the motors are fixedly connected to the center of the rear end face of the input shaft of the adjacent front gearbox. The input ends of the motors are electrically connected to the output ends of the control switches for stable driving.

[0012] Furthermore, the cylindrical rotating screen is a stainless steel cylindrical rotating screen, and the drum screen is a stainless steel drum screen, as stainless steel prevents rusting.

[0013] Furthermore, the cylindrical rotating screen has a mesh size of [mesh size] and is used for sieving.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This drum desliming screen has the following advantages:

[0015] This rotary drum desliming screen uses a cylindrical rotating screen with a lower front and higher rear angle to form a grading and screening structure with an internal drum screen. Combined with the atomized water spray design of internal and external water pipes, it can effectively solve the problem of low screening efficiency when traditional desliming screens handle dust below 30 mesh. It achieves efficient separation of fine dust, reduces coal impurities after washing, and the high-pressure water mist can wet and agglomerate the dust. External water spray can wash the screen and prevent screen hole blockage. It eliminates the need for frequent shutdowns for cleaning, improves production efficiency and reduces costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the rear end structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the front structure of the cylindrical rotating screen and the drum screen of this utility model.

[0019] In the diagram: 1. Cylindrical rotating screen, 2. Drum screen, 3. Support frame, 4. External water pipe, 5. Internal water pipe, 6. Drive ring, 7. Drive wheel, 8. Drive shaft, 9. Gearbox, 10. Motor, 11. Control switch. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-3 This embodiment provides a technical solution: a drum desliming screen, including a support frame 3;

[0022] Support 3: A cylindrical rotating screen 1 is rotatably connected between its front and rear ends. The cylindrical rotating screen 1 is inclined with the front lower than the rear. A drum screen 2 is fixedly connected inside the cylindrical rotating screen 1. The mesh size of the drum screen 2 is greater than 30 mesh, and the mesh size of the cylindrical rotating screen 1 is 30 mesh. A control switch 11 is provided on the right side of the support 3. The input end of the control switch 11 is electrically connected to an external power source. Both the front and rear ends of the support 3 are provided with drive wheels 7. Both the front and rear ends of the cylindrical rotating screen 1 are provided with drive rings 6 on their outer arc surfaces. The annular groove in the middle of the drive ring 6 is connected to the drive wheels 7 on the left and right. The outer arc surface of wheel 7 contacts the drive wheel 7. Drive shafts 8 are rotatably connected to both sides of the front and rear ends of the bracket 3. Drive wheels 7 are fixedly connected to the front and rear ends of drive shafts 8. Gearboxes 9 are located on both the left and right rear ends of the bracket 3. The output shafts of gearboxes 9 are fixedly connected to the center of the rear end face of the adjacent front drive shaft 8. Motors 10 are located on both the left and right rear ends of the bracket 3. The output shafts of motors 10 are fixedly connected to the center of the rear end face of the adjacent front input shaft of gearbox 9 (gearbox 9 is a traditional gearbox). The input shaft of motor 10... The output terminals of the control switch 11 are electrically connected. The cylindrical rotary screen 1 is a stainless steel cylindrical rotary screen, and the drum screen 2 is a stainless steel drum screen. The screen mesh of the cylindrical rotary screen 1 is 30 mesh. The powdery coal raw material to be washed enters the equipment from the inlet on the rear side of the drum screen 2. At this time, the control switch 11 is operated to make the two motors 10 run in opposite directions. The output shafts of the motors 10 rotate, which drives the two drive shafts 8 to rotate synchronously in opposite directions through the transmission of the gearbox 9. The drive wheels 7 at both ends of the drive shafts 8 are in close contact with the annular grooves of the drive rings 6 on the outer arc surface of the cylindrical rotary screen 1. Under the action of friction, the cylindrical rotary screen 1 is driven to rotate around its axis. Since the cylindrical rotary screen 1 is arranged with the front lower and the back higher, the coal raw material moves slowly towards the outlet direction along the screen body axis of the rotary screen 2 under the action of the gravity component as it rotates with the rotary screen 2. During this process, the raw material first contacts the screen of the rotary screen 2. If the screen mesh of the rotary screen 2 is greater than 30 mesh, for example 50 mesh, then coal particles with a diameter smaller than the screen hole of the rotary screen 2 and dust will initially pass through the screen of the rotary screen 2, while larger coal particles continue to move with the screen body, which is convenient for screening.

[0023] The support 3 has an internal water pipe 5 at its front end, with the rear end of the internal water pipe 5 extending into the interior of the drum screen 2. An external water pipe 4 is located on the upper side of the front end of the support 3, situated on the upper side of the cylindrical drum screen 1. (Atomizing nozzles can be installed inside the spray holes of the internal water pipe 5 and the external water pipe 4. These atomizing nozzles are conventional, mainly composed of a nozzle body and spray holes. The nozzle body is typically cylindrical or conical, with a straight flow channel inside. Liquid is sprayed directly from the flow channel through the spray holes. Relying on the liquid's own pressure, the liquid is ejected from the spray holes at a high speed. The ejected liquid column is subjected to air resistance and surface tension in the air, gradually breaking into fine droplets, forming an atomization effect.) (It is necessary to connect the front right side of the internal water pipe 5 and the external water pipe 4 to the external water pump). During the movement of the coal raw material, the external water pump connecting the internal water pipe 5 and the external water pipe 4 is started synchronously. The internal water pipe 5 extends from the front end of the support 3 into the inside of the drum screen 2. High-pressure water mist is sprayed onto the coal raw material through the atomizing nozzle. The water mist wets and agglomerates the dust particles in the coal raw material, forming larger aggregates and reducing the difficulty of screening. The external water pipe 4 is located on the upper side of the cylindrical drum screen 1. The atomizing nozzle sprays water flow onto the outside of the screen body of the cylindrical drum screen 1 to help wash away the particles attached to the screen surface of the cylindrical drum screen 1, prevent the screen holes of the cylindrical drum screen 1 from being blocked, and improve the screening efficiency of the cylindrical drum screen 1.

[0024] The working principle of the rotary drum desliming screen provided by this utility model is as follows: The powdery coal raw material to be washed enters the equipment from the inlet on the rear side of the rotary drum screen 2. At this time, the control switch 11 causes the two motors 10 to run in opposite directions. The output shaft of the motor 10 rotates and drives the two transmission shafts 8 to rotate synchronously in opposite directions through the transmission of the gearbox 9. The drive wheels 7 at both ends of the transmission shaft 8 are in close contact with the annular groove of the drive ring 6 on the outer arc surface of the cylindrical rotary screen 1. Under the action of friction, the cylindrical rotary screen 1 is driven to rotate around its axis. Since the cylindrical rotary screen 1 is inclined with the front lower and the back higher, the coal raw material moves slowly towards the outlet direction along the screen body axis of the rotary drum screen 2 under the action of gravity component force as it rotates with the rotary drum screen 2. In this process, the raw material first contacts the screen of the rotary drum screen 2. If the screen mesh of the rotary drum screen 2 is greater than 30 mesh, for example 50 mesh, then coal particles with a diameter smaller than the screen hole of the rotary drum screen 2 and dust will initially pass through the screen of the rotary drum screen 2, while larger coal particles continue to move with the screen body. In the process, the external water pump connecting the internal water pipe 5 and the external water pipe 4 starts synchronously. The internal water pipe 5 extends from the front end of the support 3 into the inside of the drum screen 2, spraying high-pressure water mist onto the coal raw material through atomizing nozzles. The water mist wets and agglomerates the dust particles in the coal raw material, forming larger aggregates and reducing the difficulty of passing through the screen. The external water pipe 4 is located on the upper side of the cylindrical drum screen 1, and the atomizing nozzles spray water flow onto the outside of the screen body of the cylindrical drum screen 1 to help wash away the particles attached to the screen surface of the cylindrical drum screen 1, prevent the screen holes of the cylindrical drum screen 1 from clogging, and improve the screening efficiency of the cylindrical drum screen 1. When the coal raw material screened by the drum screen 2 moves to the 30-mesh screen of the cylindrical drum screen 1, dust particles smaller than 30 mesh pass through the screen and are discharged, while raw material particles larger than 30 mesh continue to move along the axial direction of the screen body and are finally discharged from the outlet on the front side of the cylindrical drum screen 1 to enter the subsequent process. Large coal particles that do not pass through the screen holes of the drum screen 2 are discharged from the outlet on the front side of the drum screen 2 and collected by workers.

[0025] It is worth noting that when selecting the model of the motor 10 disclosed in the above embodiments, since the coal washing environment is usually harsh and may involve dust, moisture, etc., the protection level of the motor 10 needs to reach IP54 or above, such as IP55 or IP65. This can effectively prevent dust from entering the motor 10 and avoid the accumulation of dust affecting the heat dissipation and normal operation of the motor 10. At the same time, it can also resist a certain degree of water splash and ensure the stable operation of the motor 10 in a humid environment. For example, the explosion-proof three-phase asynchronous motor not only has good protection performance, but can also be used safely in dangerous environments with flammable and explosive gases, making it more suitable for coal washing workshops. The control switch 11 is equipped with control buttons that correspond one-to-one with the two motors 10 and are used to control their switching.

[0026] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A drum desliming screen, characterized in that: Including the support (3); Support (3): A cylindrical rotating screen (1) is rotatably connected between the front and back inside the support (3). The cylindrical rotating screen (1) is inclined with the front lower and the back higher. A drum screen (2) is fixedly connected inside the cylindrical rotating screen (1). Among them: the front end of the support (3) is provided with an internal water pipe (5), the rear end of the internal water pipe (5) extends into the interior of the drum screen (2), the upper side of the front end of the support (3) is provided with an external water pipe (4), and the external water pipe (4) is located on the upper side of the cylindrical drum screen (1).

2. The drum desliming screen according to claim 1, characterized in that: The support (3) is provided with a control switch (11) on the right side, and the input end of the control switch (11) is electrically connected to an external power source.

3. The drum desliming screen according to claim 2, characterized in that: The support (3) is provided with drive wheels (7) at both the front and rear ends, and the cylindrical rolling screen (1) is provided with drive rings (6) on the outer arc surfaces at both the front and rear ends. The annular groove in the middle of the drive ring (6) is in contact with the outer arc surfaces of the drive wheels (7) on the left and right.

4. The drum desliming screen according to claim 3, characterized in that: The bracket (3) has a drive shaft (8) rotatably connected to both the left and right sides between the front and rear ends, and the drive wheel (7) is fixedly connected to the front and rear ends of the drive shaft (8).

5. A drum desliming screen according to claim 4, characterized in that: The bracket (3) has a gearbox (9) on both the left and right sides of its rear end. The output shaft of the gearbox (9) is fixedly connected to the center of the rear end face of the adjacent transmission shaft (8) on the front side. The bracket (3) has a motor (10) on both the left and right sides of its rear end. The output shaft of the motor (10) is fixedly connected to the center of the rear end face of the input shaft of the adjacent gearbox (9) on the front side. The input end of the motor (10) is electrically connected to the output end of the control switch (11).

6. A drum desliming screen according to claim 1, characterized in that: The cylindrical rotating screen (1) is a stainless steel cylindrical rotating screen, and the drum screen (2) is a stainless steel drum screen.

7. A drum desliming screen according to claim 6, characterized in that: The cylindrical rotating screen (1) has a mesh size of 30.

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