Negative-pressure ball adding device for coal mill of power plant boiler

Abstract

The utility model relates to the technical field of power plant boiler maintenance, in particular to a power plant boiler coal mill negative pressure ball adding device which comprises a boiler machine, the center of the boiler machine is provided with the bottom end of a ball falling pipe in a ball adding mechanism, the top end of the ball falling pipe is provided with a ball adding flange cover, and the center of the ball falling pipe is fixedly provided with an air injection box. The bottom end of the ball falling pipe is connected with the upper side of the center of the dustproof piece, the left side of the top end of the air injection box is connected with the right side of the connecting pipe, the air pump is arranged on the right side of the air injection box, and the air injection pipe is arranged on the left side of the air pump and connected with the air injection box. Positive pressure pulverized coal airflow in the coal mill is prevented from leaking to the ball feeding opening in the ball feeding process, the pulverized coal airflow is prevented from entering the ball falling pipe, the powder leakage phenomenon is further reduced, efficiency is improved, meanwhile, abrasion to the auger when a large number of steel balls are fed at a time is avoided, the diversity of ball feeding can be better improved, the workload is small, and implementation and maintenance are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of power plant boiler maintenance, in particular to a negative pressure ball adding device for a coal mill of a power plant boiler. Background Art

[0002] A coal mill is a machine that breaks up coal blocks and grinds them into coal powder. It is an important auxiliary equipment for pulverized coal furnaces. Currently, most of the equipment adds a large number of balls at one time. This method will cause blockage in the ball drop pipe, affecting the efficiency of adding balls. When adding balls, the internal coal powder will overflow under the action of air pressure. Adding multiple groups of balls inside will cause wear on the auger in the boiler. At the same time, the device is too complicated and affects the efficiency of adding balls. Therefore, it is urgent to design a negative pressure ball adding device for a power plant boiler coal mill to solve the above problems. Utility Model Content

[0003] The utility model aims to provide a negative pressure ball adding device for a coal mill in a power plant boiler, so as to solve the problems mentioned in the above background technology that most of the current equipment adds a large amount of balls at one time, this method will cause blockage in the ball drop pipe, affecting the ball adding efficiency, the internal coal powder will overflow under the action of gas pressure when adding balls, the internal multiple groups of ball adding will cause wear of the auger in the boiler, and the device is too complicated, affecting the ball adding efficiency.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a negative pressure ball adding device for a boiler pulverizer in a power plant, comprising a boiler machine, the center of the boiler machine is provided with the bottom end of a ball dropping tube in a ball adding mechanism, the top of the ball dropping tube is provided with a ball adding flange cover, the center of the ball dropping tube is fixedly provided with a jet box, the bottom end of the ball dropping tube is connected to the center upper side of a dustproof part, the top left side of the jet box is connected to the right side of a connecting pipe, the right side of the jet box is provided with an air pump, the left side of the air pump is provided with a jet pipe connected to the jet box, a support frame is fixedly provided on the left side of the top of the boiler machine, the top of the support frame is provided with a storage box, the center of the storage box is provided with a ball releasing mechanism, and the right side of the bottom end of the storage box is connected to the top of a connecting pipe.

[0005] Preferably, a limiting ring is fixedly provided on the central inner wall of the ball-dropping tube, and the left side of the top end of the limiting ring is inserted into the right side of the connecting tube.

[0006] Preferably, a connecting ring is fixedly provided at the center of the connection between the jet box and the ball drop tube, a plurality of groups of jet nozzles are provided at the center of the connecting ring, and the right side of the jet nozzle is connected to the left side of the jet tube.

[0007] Preferably, the top of the vertical plate in the dustproof part is fixed to the right side of the bottom end of the ball drop tube, a rotating rod is fixed to the left side of the bottom end of the ball drop tube, the outer side of the rotating rod is sleeved on the right side of the baffle, springs are fixed to the front and back of the right side of the fixed end of the baffle, the left side of the baffle is connected to the bottom side of the L-shaped block, the top of the L-shaped block is provided with a connecting block, and the top of the connecting block is fixed to the left side of the bottom end of the ball drop tube.

[0008] Preferably, a ball delivery hole is opened on the right side of the inner center of the storage box, a limiting plate is provided at the top of the ball delivery hole, and a ball delivery port is opened at the top center of the storage box.

[0009] Preferably, the top end of the motor in the ball placing mechanism is connected to the bottom end of the rotating assembly, and a plurality of grinding balls are placed inside the rotating assembly.

[0010] Preferably, the bottom end of the rotating shaft in the rotating assembly passes through the bottom end of the storage box, a rotating disk is fixedly provided at the top end of the rotating shaft, a plurality of pushing blocks are provided on the outer side of the rotating disk, a semicircular pit is opened on the inner side of the pushing block, and a grinding ball can be clamped in the semicircular pit.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The invention discloses a negative pressure ball adding device for a coal mill of a power plant boiler. A plurality of groups of air nozzles fixedly provided with a connecting ring in an air jet box in a ball adding mechanism can use an air pump to inject compressed gas into a ball dropping tube, thereby forming a negative pressure in the ball adding tube above the air nozzles, thereby preventing the positive pressure coal powder airflow in the coal mill from leaking to the ball adding port during the ball adding process. A dustproof part provided at the bottom can further prevent the coal powder airflow from entering the interior of the ball dropping tube under the action of a spring, thereby further reducing the powder leakage phenomenon and improving the efficiency, and at the same time avoiding the wear of the auger when a large amount of steel balls are added at one time.

[0013] The negative pressure ball adding device for the coal mill of the boiler of a power plant can push a plurality of grinding balls through a rotating assembly provided inside a storage box, so that the grinding balls can be successively dropped from the ball delivery hole and the connecting pipe into the ball drop pipe for ball adding. The device can greatly improve the ball adding efficiency, has low investment cost, simple structure, and is easy to install. The ball adding flange cover at the top of the ball drop pipe can be used for manual ball adding, which can better improve the diversity of ball adding, reduce workload, and facilitate maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view cross-sectional schematic diagram of the utility model;

[0015] Figure 2 It is a cross-sectional schematic diagram of the ball adding mechanism of the utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the dustproof part of the utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the rotating assembly of the utility model;

[0018] Figure 5 This is a schematic diagram of the internal structure of the storage box of the utility model.

[0019] In the figure: 1. boiler machine; 2. ball adding mechanism; 201. ball dropping tube; 2011. limit ring; 202. ball adding flange cover; 203. jet box; 2031. connecting ring; 2032. jet nozzle; 204. dustproof part; 2041. vertical plate; 2042. rotating rod; 2043. baffle; 2044. spring; 2045. L-shaped block; 2046. connecting block; 205. connecting pipe; 3. air pump; 301. jet tube; 4. support frame; 501. ball delivery hole; 502. limit plate; 503. ball delivery port; 5. storage box; 6. ball releasing mechanism; 601. motor; 602. rotating assembly; 6021. rotating shaft; 6022. rotating disk; 6023. pushing block; 6024. semicircular pit; 603. grinding ball. DETAILED DESCRIPTION

[0020] 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.

[0021] See also Figure 1-5 , an embodiment provided by the utility model:

[0022] A negative pressure ball adding device for a coal mill in a power plant boiler comprises a boiler machine 1, characterized in that: the bottom end of a ball dropping tube 201 in a ball adding mechanism 2 is provided at the center of the boiler machine 1, a ball adding flange cover 202 is provided at the top of the ball dropping tube 201, a jet box 203 is fixedly provided at the center of the ball dropping tube 201, the bottom end of the ball dropping tube 201 is connected to the center upper side of a dustproof member 204, the top left side of the jet box 203 is connected to the right side of a connecting pipe 205, an air pump 3 is provided on the right side of the jet box 203, a jet pipe 301 connected to the jet box 203 is provided on the left side of the air pump 3, a support frame 4 is fixedly provided at the top left side of the boiler machine 1, a storage box 5 is provided at the top of the support frame 4, a ball placing mechanism 6 is provided at the center of the storage box 5, and the top of the connecting pipe 205 is connected to the top right side of the bottom end of the storage box 5.

[0023] Furthermore, a limiting ring 2011 is fixedly arranged on the central inner wall of the ball drop tube 201, and the left side of the top end of the limiting ring 2011 is inserted into the right side of the connecting tube 205, which is convenient for installation and requires less modification to the original system.

[0024] As a further feature of the present invention, a connecting ring 2031 is fixedly provided at the center of the connection between the jet box 203 and the ball drop tube 201, and a plurality of jet nozzles 2032 are provided at the center of the connecting ring 2031. The right side of the jet nozzle 2032 is connected to the left side of the jet tube 301, and a ball tube is added above the jet nozzle to form a negative pressure, so as to prevent the positive pressure coal powder airflow in the coal mill from leaking to the ball adding port during the ball adding process.

[0025] Furthermore, the top of the vertical plate 2041 in the dustproof part 204 is fixed on the right side of the bottom end of the ball falling tube 201, and the rotating rod 2042 is fixed on the left side of the bottom end of the ball falling tube 201. The outer side of the rotating rod 2042 is sleeved on the right side of the baffle 2043. Springs 2044 are fixed on the front and back of the right side of the fixed end of the baffle 2043. The left side of the baffle 2043 is connected to the bottom side of the L-shaped block 2045. The top of the L-shaped block 2045 is provided with a connecting block 2046. The top of the connecting block 2046 is fixed on the left side of the bottom end of the ball falling tube 201, so as to reduce the blockage and damage to the equipment caused by the impact of a large number of steel balls in a short period of time.

[0026] Furthermore, a ball delivery hole 501 is provided on the right side of the inner center of the storage box 5, a limiting plate 502 is provided on the top of the ball delivery hole 501, and a ball delivery port 503 is provided at the top center of the storage box 5 to facilitate the delivery of grinding balls, reduce time and improve efficiency.

[0027] Furthermore, the top of the motor 601 in the ball placing mechanism 6 is connected to the bottom of the rotating assembly 602, and a plurality of grinding balls 603 are placed inside the rotating assembly 602, which is beneficial for the steel balls to pass through the device one by one through the ball adding port and enter the coal mill, thereby avoiding the phenomenon of steel balls crowding each other and clogging the pipeline.

[0028] As a further feature of the present invention, the bottom end of the rotating shaft 6021 in the rotating assembly 602 passes through the bottom end of the storage box 5, a rotating disk 6022 is fixedly provided on the top of the rotating shaft 6021, a plurality of push blocks 6023 are provided on the outer side of the rotating disk 6022, a semicircular pit 6024 is provided on the inner side of the push block 6023, the semicircular pit 6024 can hold the grinding ball 603, and this device can be improved to change the one-time addition of a large number of steel balls into online addition of steel balls one by one.

[0029] Working principle: When in use, the user first turns on the air pump 3 to inject the compressed air into the jet box 203 through the jet pipe 301 for inflation, and then the compressed air passes through the multiple jet nozzles 2032 provided inside the connecting ring 2031, and the compressed air flows out at high speed into the ball adding and dropping tube 201 through the jet nozzles 2032. At the same time, after the compressed air forms a negative pressure in the ball dropping tube 201 above the jet nozzles 2032, the motor 601 can be started to work. When the motor 601 drives the rotating shaft 6021 to rotate, it can drive the rotating disk 6022 fixed at the top to rotate. The rotation of the rotating disk 6022 can drive the multiple groups of pushing blocks 6023 on the outside to rotate. When the pushing blocks 6023 When a grinding ball 603 is pushed into the semicircular pit 6024 at the front end and rotates into the ball delivery hole 501 at the bottom end of the limit plate 502, it can fall into the connecting pipe 205, roll to the top of the ball drop tube 201, and then fall onto the baffle 2043 to reduce the impact force of the fall and cause wear to the internal auger. When the grinding ball 603 is on the baffle 2043, it can fall into the boiler machine through the spring 2044 fixed on the right side with the action of gravity. At the same time, the baffle 2043 rebounds under the action of the spring 2044. The ball adding flange cover 202 can also be directly opened for manual ball adding. After the ball adding is completed, the motor 601 and the air pump 3 can be turned off. This is the entire working principle of the utility model.

[0030] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A negative pressure ball adding device for a power plant boiler coal mill, comprising a boiler machine (1), characterized in that: The center of the boiler machine (1) is provided with the bottom end of the ball dropping tube (201) in the ball adding mechanism (2), the top end of the ball dropping tube (201) is provided with a ball adding flange cover (202), the center of the ball dropping tube (201) is fixedly provided with an injection box (203), the bottom end of the ball dropping tube (201) is connected to the center upper side of the dustproof member (204), the top left side of the injection box (203) is connected to the right side of a connecting pipe (205), the right side of the injection box (203) is provided with an air pump (3), the left side of the air pump (3) is provided with an injection pipe (301) connected to the injection box (203), the top left side of the boiler machine (1) is fixedly provided with a support frame (4), the top end of the support frame (4) is provided with a storage box (5), the center of the storage box (5) is provided with a ball placing mechanism (6), and the bottom right side of the storage box (5) is connected to the top end of the connecting pipe (205).

2. The negative pressure ball adding device for coal mill of power plant boiler according to claim 1, characterized in that: A limiting ring (2011) is fixedly arranged on the central inner wall of the ball drop tube (201), and the left side of the top end of the limiting ring (2011) is inserted into the right side of the connecting tube (205).

3. The negative pressure ball adding device for coal mill of power plant boiler according to claim 1, characterized in that: A connecting ring (2031) is fixedly arranged at the center of the connection between the jet box (203) and the ball drop tube (201), and a plurality of groups of jet nozzles (2032) are arranged at the center of the connecting ring (2031), and the right side of the jet nozzle (2032) is connected to the left side of the jet tube (301).

4. The negative pressure ball adding device for coal mill of power plant boiler according to claim 1, characterized in that: The top end of the vertical plate (2041) in the dustproof member (204) is fixedly arranged on the right side of the bottom end of the ball-dropping tube (201); a rotating rod (2042) is fixedly arranged on the left side of the bottom end of the ball-dropping tube (201); the outer side of the rotating rod (2042) is sleeved on the right side of the baffle (2043); springs (2044) are fixedly arranged at the front and rear of the right side of the fixed end of the baffle (2043); the left side of the baffle (2043) is connected to the bottom side of the L-shaped block (2045); the top end of the L-shaped block (2045) is provided with a connecting block (2046); the top end of the connecting block (2046) is fixedly arranged on the left side of the bottom end of the ball-dropping tube (201).

5. The negative pressure ball adding device for coal mill of power plant boiler according to claim 1, characterized in that: A ball delivery hole (501) is provided on the right side of the inner center of the storage box (5), a limiting plate (502) is provided at the top of the ball delivery hole (501), and a ball delivery opening (503) is provided at the center of the top of the storage box (5).

6. The negative pressure ball adding device for coal mill of power plant boiler according to claim 1, characterized in that: The top end of the motor (601) in the ball placing mechanism (6) is connected to the bottom end of the rotating assembly (602), and a plurality of grinding balls (603) are placed inside the rotating assembly (602).

7. A negative pressure ball adding device for a coal mill of a power plant boiler according to claim 6, characterized in that: The bottom end of the rotating shaft (6021) in the rotating assembly (602) passes through the bottom end of the storage box (5); a rotating disk (6022) is fixedly provided at the top end of the rotating shaft (6021); a plurality of groups of pushing blocks (6023) are provided on the outer side of the rotating disk (6022); a semicircular pit (6024) is provided on the inner side of the pushing block (6023); and the grinding ball (603) can be clamped in the semicircular pit (6024).

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