Discharge port of powder selecting separator

Abstract

A discharging port of a powder selecting separator comprises a discharging port barrel, the lower portion of the discharging port barrel is an inlet portion, and the lateral inclined upper direction of the discharging port barrel is an outlet portion. A connecting flange is fixedly arranged at the outlet part of the discharge port, a discharge port lower flange is arranged at the inlet part of the discharge port cylinder body, a shaft bracket is fixed at the upper part of the discharge port cylinder body, and the shaft bracket penetrates through the upper part of the discharge port cylinder body and extends into the discharge port cylinder body; a material outlet channel is arranged in the discharge port barrel, a replaceable partition plate and a flow guide plate are arranged in the material outlet channel, so that the discharge port barrel and the material outlet channel are in a gradually-changing convergence mode, the material outlet channel is of an eccentric structure, and the material outlet channel is distributed in a non-centered mode relative to the center line of the discharge port. According to the utility model, the powder flow passing resistance can be effectively reduced, the pressure loss of the system is reduced, the fan power consumption of the vertical mill system is reduced, the abrasion rate of the discharge port can be effectively reduced, the service life is prolonged, and the economy is improved.

Description

Technical Field

[0001] The utility model belongs to the field of vertical mill powder separators, and specifically relates to a powder separator discharge port, the structure of which can reduce ventilation resistance and improve wear conditions, thereby reducing ventilation power consumption, saving energy in production, extending the service life of the powder separator, and improving the economy of the mill. Background Art

[0002] The vertical mill powder separator is a powder selection device located above the vertical mill with a separation function. Its function is to select the finished fine powder with qualified fineness and discharge it from the mill cavity through the discharge port. The coarse powder with unqualified fineness cannot pass through the separation mechanism of the powder separator and returns to the vertical mill grinding mechanism for further grinding. The discharge port is an important component on the powder separator. Its function is to install and fix the other components of the powder separator, such as installing the motor reducer, installing the main shaft, connecting the powder separator cylinder, and connecting the external air outlet duct. Therefore, the structure of the discharge port component is relatively complex. Secondly, it also has the function of powder transportation. Compared with smooth pipes, the internal flow field of the discharge port is much more complicated, and it is very easy to wear and tear.

[0003] At present, the discharge port structure of most vertical mill powder separators is as follows: the lower part of the discharge port is a flange plate, the middle part is a conical cylinder or a cylindrical cylinder, and the side of the cylinder is a connecting cylinder. The connecting cylinder has different structures such as cylindrical, conical, and square. The center line of the connecting cylinder intersects with the center line of the discharge port and has a certain angle with the horizontal plane. The upper part is an upper flange plate, and a shaft frame is fixed at the center of the upper flange plate. The height of the shaft frame extends from the upper flange plate downward to the position of the lower flange plate. The motor reducer and other mounting seats are arranged on the outside of the discharge port. At present, the discharge ports of common powder separators have the following problems:

[0004] (1) The common discharge port barrel structure is conical or cylindrical, with a horizontal upper flange plate on the top. There is no smooth transition at this connection. The powder flow will hit the wall when passing through this connection, resulting in kinetic energy loss, and will form turbulence to affect the internal flow field of the discharge port, increase the ventilation resistance of the discharge port, and the structural resistance is large. It is not easy for the powder to pass through the discharge port, resulting in high system power consumption.

[0005] (2) The common discharge port connecting cylinder is cylindrical or square and connected to the discharge port cylinder. Under this connection method, the internal cavity is suddenly reduced from a larger cross-section to a smaller cross-section. The resistance coefficient of this sharp-ended ventilation duct is large, resulting in a large system pressure loss, which affects the system production efficiency.

[0006] (3) The local wear rate inside the discharge port is relatively fast. When the powder passes through the rotor, it will form a forced vortex with a high rotation speed due to the rotation of the rotor. After the powder flow enters the discharge cavity, the forced vortex cannot be effectively reduced. The powder flow moves closely against the wall of the discharge port under the action of rotation, which will cause multiple structures of the discharge port to be eroded by the high-speed powder flow, and it is very easy to wear and tear. In addition, some parts are complex in shape and cannot be repaired. The only option is to replace the entire discharge port component, which increases the operating cost of the vertical mill system. Utility Model Content

[0007] Aiming at the problems in the prior art, the utility model studies the discharge port of the powder selection separator and proposes a discharge port of the powder selection separator in order to improve the economy of the vertical mill powder selection separator and reduce the maintenance and replacement cycle of the discharge port components.

[0008] The technical solution of the utility model is specifically as follows:

[0009] A powder selection separator discharge port comprises a discharge port cylinder, the lower part of the discharge port cylinder is an inlet part, and the lateral oblique upper direction of the discharge port cylinder is an outlet part; a connecting flange is fixedly arranged at the outlet part of the discharge port, a discharge port lower flange is arranged at the inlet part of the discharge port cylinder, and a shaft frame is fixed at the upper part of the discharge port cylinder, the shaft frame penetrates the upper part of the discharge port cylinder and extends to the inside of the discharge port cylinder;

[0010] The discharge port cylinder as a whole is a shell structure with a smooth transition, and inside the discharge port cylinder is a material outlet channel. Replaceable partition plates and guide plates are arranged in the material outlet channel, so that the discharge port cylinder and the material outlet channel adopt a gradual convergence form, and the material outlet channel adopts an eccentric structure. The material outlet channel is not centered relative to the center line of the discharge port, and the center line of the material outlet channel is offset by a certain distance to the positive direction of rotor rotation relative to the center line of the discharge port. The offset distance is D, so that the cylinder wall curvature of the discharge port cylinder on the positive offset side is relatively small, and the cylinder wall curvature of the discharge port cylinder on the negative deviation side is relatively large.

[0011] The partition plate arranged in the discharge port cylinder is provided with two pieces, namely the first partition plate and the second partition plate, wherein the first partition plate is arranged at the symmetrical center of the discharge port, and the two ends of the first partition plate are fixed to the first connecting plate and the second connecting plate by bolts, the first connecting plate is fixed to the shaft frame, and the second connecting plate is fixed to the discharge port cylinder;

[0012] The second partition plate is an arc plate structure, located on the center line of the arc of the discharge port, with one end intersecting at the center of the discharge port and the other end tangent to the symmetric center of the outlet. Both ends of the second partition plate are fixed to the third connecting plate and the fourth connecting plate by bolts. The fourth connecting plate is fixed to the shaft frame, and the third connecting plate is fixed to the discharge port cylinder.

[0013] The first partition plate and the second partition plate are both made of wear-resistant material with a flat plate structure.

[0014] The first partition plate has the same height as the second partition plate, and maintains a distance d1 from the bottom surface of the lower flange of the discharge port, and a distance d2 from the top surface of the discharge port cylinder.

[0015] There are two guide plates in the discharge port cylinder, which have the same structure and are symmetrical about the center line of the discharge port; the guide plate is installed at the upper part of the discharge port cylinder, at the end of the corner arc; the guide plate is fixed to the fifth connecting plate and the sixth connecting plate by bolts, the fifth connecting plate is fixed to the discharge port cylinder, and the sixth connecting plate is fixed to the shaft frame, one end of the guide plate is in contact with the discharge port cylinder, and the contact position is located at the end of the arc at the top of the discharge port cylinder, and the other end is inclined downward, with an angle of β with the vertical center line.

[0016] The guide plate is made of wear-resistant material.

[0017] The outlet plane of the discharge port cylinder and the inlet plane form an angle α, 0<α<90°.

[0018] A motor seat is arranged outside the discharge port cylinder.

[0019] The beneficial effects of the utility model are as follows: the discharge port of the powder selection separator can effectively reduce the resistance of powder flow, reduce the system pressure loss, and reduce the power consumption of the fan of the vertical mill system. Its structure can effectively slow down the wear rate of the discharge port, extend the service life, and improve the economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of the discharge port of the powder selection separator;

[0021] Figure 2 This is the front view of the discharge port of the powder selection separator;

[0022] Figure 3 It is a top view of the discharge port of the powder selection separator;

[0023] Figure 4 This is a bottom view of the powder selection separator discharge port. DETAILED DESCRIPTION

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

[0025] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0026] like Figure 1 As shown, a powder selection separator discharge port includes a discharge port cylinder 2, the lower part of the discharge port cylinder 2 is the inlet part, and the lateral oblique upper direction of the discharge port cylinder 2 is the outlet part; a connecting flange 1 is fixedly arranged at the outlet part of the discharge port, a discharge port lower flange 4 is arranged at the inlet part of the discharge port cylinder 2, an axis frame 3 is fixed at the upper part of the discharge port cylinder 2, the axis frame 3 passes through the upper part of the discharge port cylinder 2 and extends to the inside of the discharge port cylinder 2, and a motor seat 5 is arranged outside the discharge port cylinder 2.

[0027] like Figure 2 , Figure 3 As shown, the discharge port cylinder 2 is a shell structure with smooth transition as a whole, and the outlet plane and the inlet plane form an angle α, 0<α<90°. Inside the discharge port cylinder 2 is a material outlet channel, and a replaceable partition plate and guide plate are arranged in the material outlet channel, so that the discharge port cylinder 2 and the material outlet channel adopt a gradual convergence form, and the material outlet channel adopts an eccentric form, that is: the extension from the lower inlet to the oblique bottom outlet of the side is a gradual transition convergence, the material outlet channel is non-centrally distributed relative to the center line of the discharge port, and the center line of the material outlet channel is offset to the positive direction of the rotor rotation relative to the center line of the discharge port. The offset distance is D, D>0, so that the curvature of the cylinder wall of the discharge port cylinder 2 on the positive offset side is relatively small, and the curvature of the cylinder wall of the discharge port cylinder 2 on the negative deviation side is relatively large. The top surface of the discharge port cylinder 2 is a rounded smooth transition, and the lower inlet and the side outlet are connected to each other in a gradual convergence, so that the internal flow channel of the discharge port has high smoothness and a small resistance coefficient.

[0028] The partition plates arranged in the discharge port cylinder 2, that is, in the material outlet channel, are made of wear-resistant material with a flat structure. There are two plates in total, namely the first partition plate 10 and the second partition plate 7. The first partition plate 10 is arranged at the symmetrical center of the discharge port, and the two ends of the first partition plate 10 are fixed to the first connecting plate 9 and the second connecting plate 11 by bolts. The first connecting plate 9 is fixed to the shaft frame 3, and the second connecting plate 11 is fixed to the discharge port cylinder 2.

[0029] The second partition plate 7 is an arc plate structure with an arc radius of R1, located on the arc center line of the discharge port, one end intersecting at the center of the discharge port, and the other end tangent to the symmetric center of the outlet. The two ends of the second partition plate 7 are fixed to the third connecting plate 6 and the fourth connecting plate 8 by bolts, the fourth connecting plate 8 is fixed to the shaft frame 3, and the third connecting plate 6 is fixed to the discharge port cylinder 2. The first partition plate 10 has the same height as the second partition plate 7, and maintains a distance d1 from the bottom surface of the discharge port lower flange 4, and a distance d2 from the top surface of the discharge port cylinder 2.

[0030] The guide plates in the discharge port cylinder 2, that is, in the material outlet channel, are also made of wear-resistant materials. There are two guide plates in total, and the two plates have the same structure and are symmetrical about the center line of the discharge port. Here, only one guide plate implementation method is described. The installation position of the guide plate 13 is located in the upper part of the discharge port cylinder 2, at the end of the corner arc. The guide plate 13 is fixed to the fifth connecting plate 12 and the sixth connecting plate 14 by bolts. The fifth connecting plate 12 is fixed to the discharge port cylinder 2, and the sixth connecting plate 14 is fixed to the shaft frame 3. One end of the guide plate 13 is in contact with the discharge port cylinder 2, and the contact position is located at the end of the top arc of the discharge port cylinder 2. The other end is tilted downward, and the angle with the vertical center line is β, 0<β<90°.

[0031] like Figure 4 As shown, due to the structural arrangement of this embodiment, the inlet of the discharge port is divided into two parts, zone A and zone B, by the first partition plate 10 and the second partition plate 7. The area of ​​zone A is larger than that of zone B. Due to the rotation of the rotor of the powder selection separator, the relative speed of the powder flow in zone B is higher and the amount of powder passing through is larger. Through the zoning effect of the two partition plates, the ventilation cross-section of zone A is reduced to reduce the amount of powder passing through and improve local wear.

[0032] The utility model discloses a discharge port of a powder selection separator. The discharge port cylinder 2 adopts a smooth transition structure. This structure can guide the powder flow, so that the powder flow passes through the internal cavity of the discharge port as stably as possible, reducing the kinetic energy loss of the powder flow; the discharge port cylinder 2 and the outlet adopt a gradual convergence form, and the outlet adopts an eccentric form, which effectively reduces the structural resistance of the discharge port; two partition plates are arranged inside the discharge port, and their functions are: after the forced vortex formed by the powder flow of the rotor reaches here, under the action of the partition plate, the forced vortex is blocked and eliminated, so that the powder flow passes through the discharge port cavity with the shortest distance under the action of the system fan, reducing local wear; two replaceable wear-resistant guide plates 13 are arranged on the top of the discharge port cylinder, which can guide the airflow, reduce the airflow speed at the top of the outlet, and reduce the wear on the top. The discharge port of this powder selection separator can effectively reduce the resistance of the powder flow, reduce the system pressure loss, and reduce the power consumption of the fan of the vertical mill system. Its structure can effectively slow down the wear rate of the discharge port, extend the service life, and improve the economy.

[0033] Through the above technical scheme, the beneficial effects of the utility model are:

[0034] (1) Reduce the local wear inside the discharge port of the powder separator and extend its service life. The discharge port cylinder structure with a smooth transition and no docking structure at the corners can further enhance the stability of the flow field inside the discharge port. The powder flow will not directly hit the cylinder wall, reducing the local wear in the corner area. A partition plate is set inside the discharge port. After the forced vortex formed by the powder flow of the rotor reaches this place, it is blocked and eliminated by the partition plate and no longer flows close to the cylinder wall, reducing the wear of the discharge port cylinder. The guide plate structure is adopted. Since the discharge port cylinder has a large turning angle, the relative flow velocity at the top of the cylinder is higher and more prone to wear. When the high-speed powder flow passes through the top surface, it will be guided by the guide plate, which reduces the flow velocity close to the cylinder wall, thereby reducing the local wear of the discharge port cylinder.

[0035] (2) Reduce the ventilation resistance of the powder separator discharge port to achieve the purpose of reducing the power consumption of the system fan. The use of a smooth transition discharge port cylinder structure can make the internal flow field more stable and reduce the ventilation resistance; the use of an eccentric discharge port cylinder structure makes the discharge port cylinder curvature smaller on the side with the same air outlet direction as the rotor direction, and larger on the side with the opposite air outlet direction as the rotor direction. Since the powder flow rate is high on the side with the same air outlet direction as the direction, the small curvature of the cylinder wall is more conducive to the powder passing through, thereby reducing the ventilation resistance of the discharge port; the use of a partition plate structure, under the action of the partition plate, the forced vortex formed by the rotor is blocked and eliminated, so that the powder flow does not stay too much inside the discharge port and passes smoothly through the discharge port, which can achieve the effect of reducing ventilation resistance.

[0036] (3) Improve the working efficiency of the powder separator. Through a variety of measures to reduce the ventilation resistance of the discharge port of the powder separator, the flow field inside the discharge port is stable, and the powder will not stagnate and accumulate inside the discharge port, which is beneficial to improve the powder selection efficiency of the powder separator and reduce the power consumption of the fan of the vertical mill system.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be regarded as the protection scope of the present invention.

Claims

1. A powder selection separator discharge port, characterized in that: It comprises a discharge port cylinder (2), the lower part of the discharge port cylinder (2) being an inlet part, and the lateral oblique upper direction of the discharge port cylinder (2) being an outlet part; a connecting flange (1) is fixedly arranged at the outlet part of the discharge port, a discharge port lower flange (4) is arranged at the inlet part of the discharge port cylinder (2), and a shaft frame (3) is fixed at the upper part of the discharge port cylinder (2), and the shaft frame (3) passes through the upper part of the discharge port cylinder (2) and extends to the inside of the discharge port cylinder (2); The discharge port cylinder (2) is a shell structure with a smooth transition as a whole. The interior of the discharge port cylinder (2) is a material outlet channel. A replaceable partition plate and guide plate are arranged in the material outlet channel, so that the discharge port cylinder (2) and the material outlet channel adopt a gradual convergence form, and the material outlet channel adopts an eccentric structure. The material outlet channel is non-centrally distributed relative to the center line of the discharge port. The center line of the material outlet channel is offset by a certain distance D to the positive direction of the rotor rotation relative to the center line of the discharge port. The offset distance is D, so that the wall curvature of the discharge port cylinder (2) on the positive deviation side is relatively small, and the wall curvature of the discharge port cylinder (2) on the negative deviation side is relatively large.

2. The powder selection separator discharge port according to claim 1, characterized in that: The partition plate arranged in the discharge port cylinder (2) comprises two partition plates, namely a first partition plate (10) and a second partition plate (7), wherein the first partition plate (10) is arranged at the symmetrical center of the discharge port, and both ends of the first partition plate (10) are fixed to a first connecting plate (9) and a second connecting plate (11) by bolts, the first connecting plate (9) is fixed to the shaft frame (3), and the second connecting plate (11) is fixed to the discharge port cylinder (2); The second partition plate (7) is an arc plate structure, located on the arc center line of the discharge port, with one end intersecting at the center of the discharge port and the other end tangent to the symmetric center of the outlet. The two ends of the second partition plate (7) are fixed to the third connecting plate (6) and the fourth connecting plate (8) by bolts. The fourth connecting plate (8) is fixed to the shaft frame (3), and the third connecting plate (6) is fixed to the discharge port cylinder (2).

3. The powder selection separator discharge port according to claim 2, characterized in that: The first partition plate (10) and the second partition plate (7) are both made of a wear-resistant material with a flat plate structure.

4. The powder selection separator discharge port according to claim 2, characterized in that: The first partition plate (10) and the second partition plate (7) have the same height, and maintain a distance d1 from the bottom surface of the discharge port lower flange (4), and a distance d2 from the top surface of the discharge port cylinder (2).

5. The powder selection separator discharge port according to claim 1, characterized in that: The guide plates in the discharge port cylinder (2) are provided with two pieces in total, the two pieces have the same structure and are symmetrical about the center line of the discharge port; the guide plate (13) is installed at the upper part of the discharge port cylinder (2), at the end section of the corner arc; the guide plate (13) is fixed to the fifth connecting plate (12) and the sixth connecting plate (14) by bolts, the fifth connecting plate (12) is fixed to the discharge port cylinder (2), and the sixth connecting plate (14) is fixed to the shaft frame (3); one end of the guide plate (13) is in contact with the discharge port cylinder (2), and the contact position is located at the end of the top arc of the discharge port cylinder (2), and the other end is inclined downward, with an angle β with the vertical center line.

6. The powder selection separator discharge port according to claim 5, characterized in that: The guide plate is made of wear-resistant material.

7. The powder selection separator discharge port according to claim 1, characterized in that: The outlet plane of the discharge port cylinder (2) forms an angle α with the inlet plane, 0<α<90°.

8. The powder selection separator discharge port according to claim 1, characterized in that: A motor seat (5) is arranged outside the discharge port cylinder (2).

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