Roller screen for coal preparation plant

Abstract

The utility model relates to the technical field of coal separation, and particularly discloses a roller screen for a coal preparation plant, which comprises a screen box, a plurality of roller screens, a plurality of roller screens, a plurality of roller screens and a plurality of roller screens, and is characterized in that the top of one end of the screen box is provided with a feed port; the plurality of rolling shafts are sequentially arranged between the feeding hole and the discharging hole; the rolling shaft motors are arranged on the side wall of the outer side of the screen box and used for driving the rolling shafts to rotate; the feeding adjusting assembly comprises guide plates which are symmetrically arranged in the screen box and located below the feeding port and an adjusting motor which is arranged on the outer side of the screen box and used for driving the guide plates to rotate, the guide plates are driven by the adjusting motor to rotate, and therefore the falling position of the coal can be adjusted in the process that the coal enters the screen box; the coal can be uniformly distributed in the screen box, so that the contact between the rolling shaft and the coal is more uniform, the overall service life of the rolling shaft is prolonged, and the problems that the overall service life of the rolling shaft is short and the maintenance cost is high due to the fact that the abrasion of the middle position of a traditional rolling shaft is larger than that of the end positions of the traditional rolling shaft are solved.

Description

Technical Field

[0001] The present application relates to the technical field of coal material separation, and specifically discloses a roller screen for use in a coal preparation plant. Background Art

[0002] The roller screen is a machine that uses multi-axis rotation to push the material forward and screen it at the same time. The material enters the screen box from the feed inlet, and moves downstream at a faster speed under the dual effects of its own weight and the rotation of the screen plate while being screened.

[0003] Roller screen is one of the indispensable equipment in thermal power generation. The raw coal needs to be screened before crushing. The coal that meets the particle size requirements of the coal mill is directly sent to the belt conveyor through the roller screen outlet, while the larger coal lumps enter the coal crusher for crushing, thereby improving the crushing efficiency of the coal crusher and saving energy.

[0004] However, during the use of the roller screen, the rollers in the roller screen are in long-term contact with the coal, resulting in wear on the roller surface. The worn rollers will cause the screening gap to increase, so that the position of the rollers needs to be adjusted or the rollers need to be replaced. In the process of coal feeding, in order to prevent the coal from scattering, the coal is usually poured into the screen box from the center of the feed port of the roller screen, so that more coal is screened in the middle of the roller near one end of the feed port and less material is screened at both ends. Although the coal can be gradually diffused from the middle to the two ends during the screening process, the wear of the middle position of the roller in the screen box is greater than that of the end position. This phenomenon is particularly serious for the roller near one end of the feed port. When the wear of the middle part of the roller reaches the set value, the roller needs to be replaced and adjusted as a whole, which results in a lower service life of the roller as a whole and a higher maintenance cost. Therefore, in view of this, the inventor provides a roller screen for a coal preparation plant to solve the above problems. Utility Model Content

[0005] The utility model aims to solve the problem that the wear of the middle part of the traditional roller is greater than that of the end part, resulting in a shorter service life of the entire roller and a higher maintenance cost.

[0006] In order to achieve the above-mentioned purpose, the basic scheme of the utility model provides a roller screen for a coal preparation plant, comprising:

[0007] A screen box, with a feed inlet at the top of one end of the screen box and several discharge ports at the bottom of the screen box;

[0008] A plurality of rollers are arranged in sequence between the inlet and the outlet;

[0009] A plurality of roller motors are arranged on the outer side wall of the screen box and are used to drive the rollers to rotate;

[0010] The feed regulating component comprises a material guide plate which is symmetrically arranged in the screen box and located below the feed opening, and an regulating motor which is arranged outside the screen box and used for driving the material guide plate to rotate.

[0011] The principles and effects of this basic solution are:

[0012] Compared with the prior art, the utility model sets a feed adjustment component and utilizes an adjustment motor to drive the guide plate to rotate, so that the falling position of the coal can be adjusted during the process of the coal entering the screen box, so that the coal can be evenly distributed in the screen box, thereby making the contact between the roller and the coal more uniform, that is, the wear of each position of the roller is more uniform, so as to extend the service life of the roller as a whole, thereby solving the problem that the wear of the middle position of the traditional roller is greater than the wear of the end position, resulting in a lower service life of the roller as a whole and a higher maintenance cost.

[0013] Furthermore, the feed adjustment component also includes:

[0014] A fixed seat is arranged in the screen box and below the feed inlet;

[0015] Two adjusting shafts are symmetrically connected to the fixed seat and the ends of the adjusting shafts extend out of the screen box and are provided with mutually meshing gears, and the adjusting motor drives one of the gears to rotate;

[0016] The two connecting sleeves are respectively sleeved on the outer walls of the two adjusting rotating shafts and rotate synchronously with the adjusting rotating shafts, and one end of the material guide plate is respectively fixedly connected with the connecting sleeves.

[0017] Through the above arrangement, the adjusting motor rotates through the driving gear, thereby driving the connecting shaft to rotate in opposite directions, so that the two guide plates rotate symmetrically, so as to adjust the position of the coal material, thereby making the contact between the coal material and the roller more uniform.

[0018] Furthermore, a collecting hopper is provided at one end of the guide plate away from the connecting sleeve, a discharge port is provided at one side of the guide plate close to the discharge port, and baffles are provided on both sides of the guide plate between the connecting sleeve and the collecting hopper. By providing the collecting hopper, the discharge port and the baffle, not only can the coal be concentrated and dropped from the discharge port to the roller to improve the uniformity of coal distribution, but also the coal can be prevented from dropping from both ends of the guide plate and entering the dead corner of the screen box.

[0019] Furthermore, the bottom of the collecting hopper is provided with an inclined surface, and the discharge port is located at the lowest point of the inclined surface. The inclined surface is provided to facilitate the coal to fall from the discharge port.

[0020] Furthermore, both ends of the fixing seat are provided with partitions, and one end of the guide plate close to the connecting sleeve is provided with a through slot, and when the guide plate rotates, the through slot is tightly fitted with the partition. By providing the partition, the coal can be prevented from falling into the roller from the gap between the two baffles, and the uniformity of the contact between the coal and the roller is further improved.

[0021] Furthermore, the contacting parts of the partition plate and the through groove of the guide plate are sleeved with sealing gaskets, which prevent coal powder from getting stuck between the partition plate and the through groove and increasing the wear of the partition plate and the guide plate.

[0022] Furthermore, the fixing seat is symmetrically provided with mounting grooves adapted to the connecting sleeves on both sides, the connecting sleeves are respectively rotatably connected in the mounting grooves, and the opening arc of the mounting grooves is π / 2. This arrangement can prevent coal from entering the mounting grooves while ensuring the rotation stroke of the guide plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments 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 creative work.

[0024] Figure 1 A top view of a roller screen for a coal preparation plant proposed in an embodiment of the present application is shown;

[0025] Figure 2 A schematic diagram of a feed adjustment assembly in a roller screen for a coal preparation plant proposed in an embodiment of the present application is shown;

[0026] Figure 3 A cross-sectional view of a feed adjustment assembly in a roller screen for a coal preparation plant proposed in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0027] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0028] The figure marks in the drawings of the specification include: screening 1, feeding port 2, roller 3, guide plate 4, roller motor 5, adjustment motor 6, fixing seat 7, partition 8, adjustment shaft 9, baffle 10, collection bucket 11.

[0029] A roller screen for a coal preparation plant, for example Figure 1 As shown, it includes the following structures:

[0030] Screen box: A feed inlet 2 is provided at the top right end of the screen box, and a plurality of discharge ports are provided at the bottom of the screen box.

[0031] A plurality of rollers 3 are arranged in sequence between the feed port 2 and the discharge port, and the screening gaps between the rollers 3 are increased in sequence to screen coal materials of different sizes 1 .

[0032] A plurality of roller motors 5 are arranged on the outer side wall of the screen box and are respectively connected to the rollers 3 through couplings to drive the rollers 3 to rotate, thereby screening the coal 1.

[0033] The feed adjustment assembly includes a guide plate 4 symmetrically arranged in the screen box and below the feed port 2, and an adjustment motor 6 arranged outside the screen box and used to drive the guide plate to rotate. Specifically, Figure 2 and Figure 3 As shown, the guide plate 4 is installed in the following manner: a fixed seat 7 is provided below the feed inlet 2 in the screen box, the top of the fixed seat 7 is an arc-shaped surface, the middle of the arc-shaped surface is higher than the two sides of the arc-shaped surface, and arc-shaped installation grooves are provided on the left and right sides of the fixed seat 7, and an adjusting shaft 9 is rotatably installed in each installation groove, and a connecting sleeve that rotates synchronously with the adjusting shaft and is adapted to the cross-sectional size of the installation groove is sleeved on the outer wall of the adjusting shaft 9, and a key connection can be adopted between the adjusting shaft 9 and the connecting sleeve, and one end of the guide plate 4 is respectively welded and fixed to the connecting sleeve, and since the guide plate 4 needs to rotate at an angle of 90°, the opening arc of the installation groove is π / 2; and the adjusting motor 6 obtains the rotation of the two guide plates 4 in the following manner: a reducer is connected to the output end of the adjusting motor 6, and the ends of the two adjusting shafts 9 extend out of the screen box and are respectively coaxially connected to a gear, the two gears are meshed with each other, and the output end of the reducer is coaxially connected to one of the gears.

[0034] In this embodiment, a collecting bucket 11 is provided at the end of each of the two guide plates 4. The collecting bucket 11 is a cylindrical collecting bucket 11 with an open mouth facing the surface of the guide plate 4, and a discharge port is provided on the left side of the collecting bucket 11. An inclined surface is provided at the bottom of the collecting bucket 11, and the discharge port is located at the lowest point of the inclined surface. The size of the discharge port is the same as the cross-section of the collecting bucket 11 to improve the discharge efficiency. Baffles 10 are provided on the left and right sides of the guide plate 4. The baffle 10 is located between the connecting sleeve and the collecting bucket 11, so that the coal is concentrated and falls from the discharge port, and the coal is prevented from falling directly from the side of the guide plate 4. Since the guide plate 4 needs to rotate, there is a gap between the baffles 10, so partitions 8 are provided at both ends of the fixed seat 7, and through grooves adapted to the partitions 8 are provided at the ends of the guide plate 4. Sealing gaskets are provided at the contact points between the partitions 8 and the through grooves of the guide plate 4. When the guide plate 4 rotates, the through grooves and the sealing gaskets on the partitions 8 fit tightly.

[0035] During the implementation of this embodiment, the adjusting motor 6 is used to rotate by driving the gear, thereby driving the connecting shaft to rotate in opposite directions, so that the two guide plates 4 rotate symmetrically. After the coal enters the screen box from the feed port 2, it falls onto the surface of the guide plate 4 and slides along the guide plate 4 into the collecting bucket 11, and finally falls from the discharge port of the collecting bucket 11 to the top of the roller 3, so that the coal is screened 1 by the roller 3. By adjusting the position of the guide plate 4 by adjusting the motor 6, the falling position of the coal can be adjusted, so that the coal can be evenly distributed in the screen box, that is, the wear of each position of the roller 3 is more uniform, so as to extend the overall service life of the roller 3, thereby solving the problem that the wear of the middle position of the traditional roller 3 is greater than the wear of the end position, resulting in a lower overall service life and higher maintenance cost of the roller 3.

[0036] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A roller screen for a coal preparation plant, characterized in that: include: A screen box, with a feed inlet at the top of one end of the screen box and several discharge ports at the bottom of the screen box; A plurality of rollers are arranged in sequence between the inlet and the outlet; A plurality of roller motors are arranged on the outer side wall of the screen box and are used to drive the rollers to rotate; The feed regulating assembly comprises a guide plate symmetrically arranged in the screen box and below the feed inlet, and an regulating motor arranged outside the screen box and used for driving the guide plate to rotate. The feed regulating assembly also comprises: A fixed seat is arranged in the screen box and below the feed inlet; Two adjusting shafts are symmetrically connected to the fixed seat and the ends of the adjusting shafts extend out of the screen box and are provided with mutually meshing gears, and the adjusting motor drives one of the gears to rotate; The two connecting sleeves are respectively sleeved on the outer walls of the two adjusting rotating shafts and rotate synchronously with the adjusting rotating shafts, and one end of the material guide plate is respectively fixedly connected with the connecting sleeves.

2. A roller screen for coal preparation plant according to claim 1, characterized in that: The end of the guide plate away from the connecting sleeve is provided with a collecting bucket, the side of the collecting bucket close to the discharge port is provided with a discharge port, and baffles located between the connecting sleeve and the collecting bucket are provided on both sides of the guide plate.

3. A roller screen for coal preparation plant according to claim 2, characterized in that: The bottom of the collecting hopper is provided with an inclined surface, and the discharge port is located at the lowest point of the inclined surface.

4. A roller screen for coal preparation plant according to claim 2 or 3, characterized in that: Both ends of the fixing seat are provided with partitions, and one end of the guide plate close to the connecting sleeve is provided with a through groove. When the guide plate rotates, the through groove is tightly fitted with the partition.

5. A roller screen for coal preparation plant according to claim 4, characterized in that: The contacting positions of the partition plate and the through groove of the material guide plate are both sleeved with sealing gaskets.

6. A roller screen for coal preparation plant according to claim 1, characterized in that: The fixing seat is symmetrically provided with mounting grooves adapted to the connecting sleeve on both sides, the connecting sleeves are rotatably connected in the mounting grooves respectively, and the opening arc of the mounting grooves is π / 2.

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