Device for preventing powder leakage of short shaft of stranding cage
By using air pressure sealing technology in the sealing box and air supply pipe in the boiler pulverizing system, the problem of leakage in the sealing cavity was solved, and the stable operation of the equipment and the improvement of production efficiency were achieved.
Patent Information
- Application Number
- CN202423323601.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2034-12-31
AI Technical Summary
In existing boiler pulverizing systems, inadequate sealing of the sealing cavity leads to coal powder leakage, affecting production efficiency and increasing the consumption of manpower and resources.
A sealed environment is formed by using a sealed box and air supply pipe. The air volume is adjusted by a pressure sensor and controller to ensure that the pressure inside the sealed box is greater than the pressure in the sealed chamber, thus preventing coal powder leakage. The stability and reliability of the equipment are improved by using an observation hole and a quick-release mechanism.
It effectively prevents coal powder leakage, reduces maintenance frequency and costs, improves equipment stability and production efficiency, and ensures safe equipment operation.
Smart Images
Figure CN223832424U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of coal mill technology, specifically to a device for preventing coal powder leakage from the short shaft of the auger. Background Technology
[0002] The boiler pulverizing system is an important component of a coal-fired boiler. Its main function is to grind raw coal into pulverized coal of a certain fineness and then send it into the boiler combustion chamber for combustion. The pulverizing system mainly includes a ball mill, a screw conveyor, and a hot air box. The ball mill grinds the coal into powder, the hot air box introduces hot air to dry the pulverized coal, and the screw conveyor transports it out. The main shaft and support bearing housing of the ball mill and screw conveyor are located outside the hot air box. To prevent coal dust from flying out and leaking under the action of hot air, a sealing cavity is set between the main shaft and the hot air box. Currently, the sealing cavity is mainly sealed with graphite and nickel wire packing. However, in actual operation, it was found that the sealing cavity is not tight. The pressure inside the hot air box is transmitted to the sealing cavity, causing some coal dust to leak from the gaps in the packing. The service life of the sealing material is shortened due to repeated pressure. Graphite and nickel wire packing need to be replaced frequently. When the sealing material is replaced, the ball mill and screw conveyor must be stopped, and production cannot continue. Therefore, production efficiency is affected, and the input and consumption of manpower and material resources are increased.
[0003] Therefore, in order to solve the above problems and overcome the shortcomings of existing technologies, there is an urgent need for a device to prevent coal powder leakage from the short shaft of the winch, thereby preventing coal powder leakage and reducing the input and consumption of manpower and resources. Utility Model Content
[0004] The present invention aims to provide a device for preventing coal dust leakage from the short shaft of a winch. By adding a sealing box and an air supply pipe to form a wind pressure sealing environment, coal dust leakage is prevented, and the input and consumption of manpower and material resources are reduced.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A device for preventing powder leakage from the short shaft of a winch includes a sealed chamber, a first air supply pipe, and a sealed box. A sealing plate is detachably connected to one end of the sealed box, and the other end of the sealed box is welded to the sealed chamber. A first through hole is formed on the side wall of the sealed box. The output end of the first air supply pipe is welded to the side wall of the sealed box, and the output end of the first air supply pipe is concentric with the first through hole and has an outer diameter larger than the diameter of the first through hole. A controller and an electric regulating valve are provided on the first air supply pipe. A pressure sensor is provided inside the sealed box. The pressure sensor detects the pressure inside the sealed box and transmits the pressure signal to the controller. The controller receives the pressure signal and controls the opening size of the electric regulating valve.
[0007] The principle and advantages of this scheme are:
[0008] To address the shortcomings of existing technical solutions, this invention adds a sealed box with a sealing plate and a first air supply pipe, changing the exposed environment at the short shaft of the auger. One end of the sealed box is welded to the sealed chamber, and the other end is sealed with a sealing plate, forming a sealed environment. The first air supply pipe supplies air into the sealed box through a first through-hole, increasing the pressure inside the sealed box and creating a wind pressure sealing environment, effectively preventing coal dust leakage from the short shaft of the auger. A pressure sensor inside the sealed box, in conjunction with a controller, controls an electric regulating valve based on the pressure value inside the sealed box, adjusting the airflow input of the first air supply pipe to ensure that the pressure inside the sealed box is always greater than the pressure in the sealed chamber, and that the pressure inside the sealed box remains within a safe range.
[0009] Furthermore, the hot air generated in the original sealed chamber would leak out through the gaps in the packing and be dissipated through the outside air. However, because the sealing alters the exposed environment at the short shaft of the winch, the generated hot air would accumulate inside the sealed box, causing the bearing temperature to become too high. But due to the pressurization effect of the air supply pipe, the pressure inside the sealed box is greater than the pressure inside the sealed chamber. This prevents the hot air from leaking into the sealed box through the gaps in the packing, thus preventing the bearing temperature from becoming too high and causing equipment malfunctions and damage. This ensures stable equipment operation and improved production efficiency.
[0010] This solution adopts a wind pressure sealing mechanism, which avoids frequent replacement of sealing materials, significantly reduces maintenance costs and time, improves overall economic efficiency, solves the problem of coal powder leakage due to the pressure of the hot air box and the inadequate sealing of the sealing chamber, ensures stable operation of the equipment, and improves production efficiency.
[0011] Preferably, as an improvement, the sealing plate is provided with an observation mechanism, which includes an observation hole and a cylinder. The observation hole is located on the sealing plate, the cylinder is concentric with the observation hole, one end of the cylinder is connected to the sealing plate, and the other end of the cylinder is embedded with glass.
[0012] In practical applications, transparent glass is installed inside the observation port to facilitate observation of the sealed enclosure and timely detection of equipment abnormalities, allowing operators to clearly see the internal situation. The observation port design not only facilitates daily monitoring and maintenance, but also allows operators to visually assess the condition of pulverized coal leakage and quickly take measures to prevent potential malfunctions. This greatly improves the safety and reliability of equipment operation, thereby ensuring production efficiency and efficient resource utilization.
[0013] Preferably, as an improvement, the sealing box has a first flange on the side for connecting the sealing plate, and an elastic sealing ring is provided on the first flange; the cylinder has a second flange and a cover plate, the cover plate is annular, and the cover plate has a threaded hole that mates with the second flange, and the cover plate and the second flange are bolted together.
[0014] To enhance the sealing performance of the sealing box, a first flange is provided on the side of the sealing box used to connect the sealing plate. A flexible sealing ring is installed on the first flange, further enhancing the sealing effect of the sealing box. To protect the glass and enhance the sealing performance, a second flange and cover plate are provided at the end of the cylinder where the glass is installed. The annular cover plate covers the glass and is bolted to the second flange, which not only compresses and protects the glass but also enhances the sealing performance. Furthermore, the cover plate is designed to be removable for easy replacement of damaged glass.
[0015] Preferably, as an improvement, one end of the cylinder is provided with a stepped hole, which includes a first diameter section and a second diameter section. Both the step and the cover plate at the connection between the second diameter section and the first diameter section are provided with elastic sealing rings.
[0016] Based on the above scheme, to further enhance the sealing performance and service life of the observation hole mechanism, the cylindrical structure was improved. A stepped hole was provided at the end where the glass is installed, and elastic sealing rings were provided on the step and cover plate at the connection between the second diameter section and the first diameter section to prevent the glass from directly contacting the cover plate and causing damage. At the same time, the two layers of sealing rings greatly enhanced the sealing performance and ensured the working stability of the sealed box.
[0017] Preferably, as an improvement, it also includes a second air supply pipe, a second through hole is provided on the other side wall of the sealed box, the output end of the second air supply pipe is welded to the other side wall of the sealed box, the output end of the second air supply pipe is concentric with the second through hole and the outer diameter is larger than the diameter of the second through hole, and the input end of the second air supply pipe is connected to the first air supply pipe.
[0018] To improve air supply pressurization and cooling efficiency, a second through-hole is provided on the other side of the sealed box, and a second air supply pipe is added, increasing the air supply volume and efficiency, as well as the pressurization and cooling efficiency. Since the travel paths of the first and second air supply pipes are not significantly different, and for ease of installation and use, the input end of the second air supply pipe is directly connected to the first air supply pipe. Air is supplied to both the first and second air supply pipes simultaneously through the input end of the first air supply pipe, allowing for unified airflow control—simple and quick.
[0019] Preferably, as an improvement, a quick-connect and quick-release mechanism is provided between the sealing plate and the sealing box. The quick-connect and quick-release mechanism includes a lock hole and a lock block. The lock hole is opened on the flange of the sealing box and is a T-shaped through hole. The lock block is a T-shaped protrusion structure. The lock block is located around the sealing plate. The number and position of the lock blocks correspond to the lock holes. The lock blocks and lock holes are tenon-jointed.
[0020] The quick-connect and quick-disconnect mechanism allows for rapid and convenient installation and removal of the sealing plate, significantly reducing the difficulty and time required for maintenance and replacement. Furthermore, the improved connection method effectively prevents bolt loosening caused by vibration, thus avoiding a decrease in sealing performance and further enhancing the overall structural stability. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this utility model.
[0022] Figure 2 This is a schematic diagram of the internal structure of Embodiment 1 of the present invention.
[0023] Figure 3 This is a schematic diagram of the overall structure of Embodiment 2 of this utility model.
[0024] Figure 4 This is a schematic diagram of the sealing plate in Embodiment 2 of this utility model.
[0025] Figure 5 This is a schematic diagram of the connection structure between the sealing plate and the sealing box in Embodiment 2 of this utility model. Detailed Implementation
[0026] The following detailed description illustrates the specific implementation method:
[0027] The reference numerals in the accompanying drawings include: sealed chamber 1, sealed box 2, first air supply pipe 3, second air supply pipe 4, sealing plate 5, cover plate 6, packing 7, first lock hole 21, second lock hole 22, first flange 23, second flange 51, sealing ring 52, handle 53, first locking block 54, and second locking block 55.
[0028] Example 1 is basically as shown in the appendix. Figure 1-2 As shown:
[0029] As attached Figure 1 As shown, a device for preventing powder leakage from the short shaft of a winch includes a sealed chamber 1. (See attached diagram) Figure 2As shown, the packing 7 is wound around the main shaft. Under the pressure of the sealed chamber 1, pulverized coal may leak from the gap between the packing 7 and the sealed chamber 1. To solve this problem, an anti-leakage device is provided in this embodiment. The device includes an air supply mechanism, a sealed box 2, and a sealing plate 5. The air supply mechanism includes a first air supply pipe 3 and a second air supply pipe 4. The left end of the sealed box 2 is welded to the sealed chamber 1, changing the original exposed environment at the short shaft of the auger. The other end of the sealed box 2 is provided with a first flange 23, and an elastic sealing ring is provided on the first flange 23 to further enhance the sealing effect. A first through hole is formed on the left side wall of the sealed box 2. The output end of the first air supply pipe 3 is welded to the left side wall of the sealed box 2. The output end of the first air supply pipe 3 is concentric with the first through hole and its outer diameter is larger than the diameter of the first through hole. A second through hole is formed on the right side wall of the sealed box 2. The output end of the second air supply pipe 4 is welded to the right side wall of the sealed box 2. The output end of the second air supply pipe 4 is concentric with the second through hole and its outer diameter is larger than the diameter of the second through hole. The input end of the second air supply pipe 4 is connected to the first air supply pipe 3. Air enters from the input end of the first air supply pipe 3 and exits through the first air supply pipe 3 and the second air supply pipe 4 respectively. The first air supply pipe 3 supplies air into the sealed box 2 through the first through hole, and the second air supply pipe 4 supplies air into the sealed box 2 through the second through hole.
[0030] A controller and an electric regulating valve are installed at the input end of the first air supply pipe 3. A pressure sensor is installed inside the sealed box 2. The pressure sensor detects the pressure inside the sealed box 2 and transmits the pressure signal to the controller. The controller receives the pressure signal and controls the opening size of the electric regulating valve. The controller uses existing PLC technology. Since the controller and electric regulating valve are existing technologies, they are not shown in the figure and will not be described in detail here. The controller automatically adjusts the air supply volume based on the pressure signal from the pressure sensor, ensuring that the pressure inside the sealed box 2 is greater than the pressure inside the sealed chamber 1, while ensuring that the pressure does not exceed the safety limit. The sealed box 2 maintains an appropriate positive pressure, thereby effectively preventing powder leakage from the short shaft of the auger. In addition, the hot air generated in the original sealed chamber would leak out from the gaps in the packing and then be dissipated through the outside air. However, because the sealing changes the exposed environment at the short shaft of the auger, the generated hot air will accumulate in the sealed box, causing the bearing temperature to be too high. However, due to the pressurization effect of the air supply pipe, the pressure in the sealed box is greater than the pressure in the sealed chamber. The hot air in the sealed chamber cannot leak into the sealed box from the gaps in the packing, which fundamentally solves the problem of hot air accumulation causing the bearing temperature to be too high, ensuring the stable operation of the equipment and improving production efficiency.
[0031] like Figure 1As shown, to facilitate observation of the interior of the sealed box 2, timely detection of equipment abnormalities, and convenient daily monitoring and maintenance, an observation mechanism is installed on the sealing plate 5. This mechanism consists of an observation hole, a cylinder with a flange, and an annular cover plate 6. The observation hole is located in the lower middle part of the sealing plate 5, and the cylinder is coaxial with the observation hole, with its left end fixed to the sealing plate 5. A stepped hole is designed at the right end of the cylinder, which is composed of a first diameter section and a second diameter section. Elastic sealing rings 52 are provided at the connection between the first and second diameter sections and on the cover plate 6. The glass is fitted onto the step where the sealing rings 52 are installed. The flange at the right end of the cylinder is a second flange 51, and the cover plate 6 has a threaded hole that matches the second flange 51. The cover plate 6 and the second flange 51 are connected by bolts. In addition, the sealing plate 5 and the sealed box 2 are also connected by a bolt structure.
[0032] The technical solution of this embodiment is formed by combining the sealing box 2, sealing plate 5, air supply mechanism, observation mechanism, pressure sensor, and electric regulating valve. It constitutes a device for preventing coal powder leakage from the short shaft of the auger. The pressure sensor detects the pressure signal and controls the opening degree of the electric regulating valve. The air supply mechanism supplies air so that the pressure inside the sealing box 2 is greater than the pressure in the sealing chamber 1, forming a positive air pressure sealing environment. This not only solves the problem of coal powder leakage and ensures the stable operation of the boiler pulverizing system, but also reduces the input and consumption of manpower and material resources.
[0033] The specific implementation method is as follows:
[0034] As attached Figure 1 As shown, after installing the sealing box 2, install the air supply mechanism, pressure sensor, and sealing plate 5. Check that the connections of each component are secure and conduct a pressure test to ensure the system's sealing performance meets the standards. Start the air supply mechanism and observe the pressure gauge reading to ensure that the pressure inside the sealing box 2 is stably maintained within the predetermined safe range. At the same time, check whether the observation mechanism can clearly display the internal situation for daily monitoring. For any potential abnormalities, make timely adjustments and maintenance to ensure long-term stable operation of the equipment. Start the boiler pulverizing system, and then start the air supply device of this scheme. Air enters the sealing box 2 from the first air supply pipe 3 and the second air supply pipe 4. The pressure inside the sealing box 2 gradually increases. When the pressure reaches the set value, the pressure sensor transmits a signal to the electric regulating valve, which adjusts the air volume to maintain a constant pressure.
[0035] Example 2 is attached. Figure 3-5 As shown:
[0036] Unlike Embodiment 1, the sealing plate 5 and the sealing box 2 are connected by a quick-connect and quick-release mechanism. The quick-connect and quick-release mechanism includes lock holes and lock blocks. The lock blocks are divided into a first lock block 54 and a second lock block 55, and the corresponding lock holes are divided into a first lock hole 21 and a second lock hole 22. The lock holes are opened on the first flange 23 of the sealing box 2. The first lock hole 21 is a wide T-shaped through hole, and the first lock block 54 is a thick T-shaped protrusion structure. Due to the insufficient flange width in the middle area, the second lock hole 22 is a thin T-shaped through hole, and the second lock block 55 is a thin T-shaped protrusion structure. The first lock block 54 is located on the left and right sides of the sealing plate 5, and the second lock block 55 is located on the center line of the sealing plate 5. The number and position of the lock blocks and lock holes correspond, and the lock blocks and lock holes are tenon-jointed.
[0037] Based on Example 1, the connection method between the sealing plate 5 and the sealing box 2 was improved. A quick-release and quick-connect structure enabled rapid installation and disassembly, significantly improving maintenance efficiency. Furthermore, the improved connection method enhanced the overall structural stability and sealing effect. Ordinary bolt connections can loosen due to vibration; the quick-release and quick-connect mechanism solves this loosening problem that may occur during operation. Detailed implementation method:
[0039] The difference from Embodiment 1 lies in the installation steps of the sealing plate 5. Grasp the handle 53 and align the locking block of the sealing plate 5 with the lock hole. After inserting the locking block into the lock hole, pull down the sealing plate 5 to complete the tenon joint between the locking block and the lock groove. The other parts are the same as in Embodiment 1, and will not be described again here.
[0040] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.
Claims
1. A device for preventing powder leakage from the short shaft of a winch, comprising a sealed chamber, characterized in that: It also includes a first air supply pipe and a sealing box. One end of the sealing box is detachably connected to a sealing plate, and the other end of the sealing box is welded to the sealing chamber. A first through hole is opened on the side wall of the sealing box. The output end of the first air supply pipe is welded to the side wall of the sealing box. The output end of the first air supply pipe is concentric with the first through hole and its outer diameter is larger than the diameter of the first through hole. A controller and an electric regulating valve are provided on the first air supply pipe. A pressure sensor is provided inside the sealing box. The pressure sensor is used to detect the pressure inside the sealing box and transmit the pressure signal to the controller. The controller is used to receive the pressure signal and control the opening size of the electric regulating valve.
2. The device for preventing powder leakage from the short shaft of a auger according to claim 1, characterized in that: The sealing plate is provided with an observation mechanism, which includes an observation hole and a cylinder. The observation hole is located on the sealing plate, and the cylinder is concentric with the observation hole. One end of the cylinder is connected to the sealing plate, and the other end of the cylinder is embedded with glass.
3. The device for preventing powder leakage from the short shaft of a auger according to claim 2, characterized in that: The sealing box has a first flange on one side for connecting the sealing plate, and an elastic sealing ring is provided on the first flange; the cylinder has a second flange and a cover plate, the cover plate is in the shape of a ring, and the cover plate has a threaded hole that mates with the second flange. The cover plate and the second flange are connected by bolts.
4. The device for preventing powder leakage from the short shaft of a auger according to claim 3, characterized in that: One end of the cylinder is provided with a stepped hole, which includes a first diameter section and a second diameter section. The step and the cover plate at the connection between the second diameter section and the first diameter section are provided with elastic sealing rings.
5. The device for preventing powder leakage from the short shaft of a auger according to claim 4, characterized in that: It also includes a second air supply pipe. A second through hole is opened on the other side wall of the sealed box. The output end of the second air supply pipe is welded to the other side wall of the sealed box. The output end of the second air supply pipe is concentric with the second through hole and its outer diameter is larger than the diameter of the second through hole. The input end of the second air supply pipe is connected to the first air supply pipe.
6. A device for preventing powder leakage from the short shaft of a winch according to any one of claims 1-5, characterized in that: The sealing plate and the sealing box are provided with a quick-connect and quick-disconnect mechanism, which includes a lock hole and a lock block. The lock hole is opened on the first flange of the sealing box and is a T-shaped through hole. The lock block is a T-shaped protrusion structure. The lock block is located around the sealing plate. The number and position of the lock block correspond to the lock hole. The lock block and the lock hole are tenon-jointed.