Heavy slag pipeline structure of flotation sieve

Abstract

The utility model discloses a heavy slag pipeline structure of a flotation sieve, and belongs to the field of corrugated paper manufacturing equipment. The slag discharging device comprises a slag discharging main pipe connected to the bottom of the flotation screen, a pressure relief opening is formed in the side face of the slag discharging main pipe and connected with a pressure relief valve, the discharging end of the pressure relief valve is connected with a pressure relief side pipe, and the length of the pressure relief side pipe is smaller than 0.5 m. According to the invention, excess pressure generated in the deslagging process can be effectively released, so that the vibration phenomenon caused by pressure fluctuation of the pipeline is obviously reduced, and the stability and safety of a pipeline system are improved. In addition, the length of the pressure relief side pipe is controlled within 0.5 m, the pressure loss in the pipeline can be remarkably reduced, it is ensured that the pressure relief valve quickly responds to pressure changes, and meanwhile secondary blockage caused by accumulation of materials in the side pipe is effectively avoided through the compact structural design.

Description

Technical Field

[0001] This application relates to the field of corrugated paper manufacturing equipment, and in particular to a flotation screen heavy residue pipeline structure. Background Technology

[0002] In the corrugated paper production process, flotation screens are a key pulp purification device, mainly used to remove impurities in the pulp (such as ink, adhesives, plastic films, foam, etc.), improve pulp cleanliness, and thus ensure the quality and production efficiency of corrugated base paper.

[0003] During the use of flotation screens, slag needs to be discharged through pipelines. During the slag discharge process, the pipeline is opened and closed by valves. When the valves are closed quickly during the opening and closing process, the slag discharge fluid (a mixture of gas and impurities) in the pipeline is suddenly blocked due to inertia. The kinetic energy is converted into pressure energy, forming an instantaneous high-pressure shock wave (positive water hammer) or a low-pressure cavity (negative water hammer). This pressure fluctuation will cause the pipeline to vibrate violently.

[0004] Among the relevant solutions, the first is to use slowly opening and closing valves to address the problem of sudden pressure changes. The second is to install eliminators or accumulators on the pipeline to eliminate pressure fluctuations. In the first solution, the prolonged valve opening and closing time may lead to a delay in slag discharge, especially in scenarios requiring rapid shut-off or flow regulation (such as sudden blockages or emergency shutdowns), potentially affecting system response speed. In the second solution, high-performance water hammer eliminators (such as airbag or piston types) or accumulators are expensive, especially large-capacity or corrosion-resistant models.

[0005] Based on this, this application provides a flotation screen heavy slag pipeline structure to solve the above-mentioned technical problems. Utility Model Content

[0006] To address the vibration issue during slag discharge from pipelines, this application provides a flotation screen heavy slag pipeline structure.

[0007] The flotation screen heavy slag pipeline structure provided in this application adopts the following technical solution:

[0008] A flotation screen heavy residue pipeline structure includes a main discharge pipe connected to the bottom of the flotation screen, a pressure relief port is provided on the side of the main discharge pipe, a pressure relief valve is connected to the pressure relief port, and a pressure relief side pipe is connected to the discharge end of the pressure relief valve, the length of the pressure relief side pipe is less than 0.5m.

[0009] By adopting the above technical solution, a pressure relief port can be opened on the side of the main slag discharge pipe and connected to a pressure relief valve and a pressure relief side pipe, effectively releasing excess pressure generated during the slag discharge process. This significantly reduces pipeline vibration caused by pressure fluctuations, improving the stability and safety of the pipeline system. Furthermore, controlling the length of the pressure relief side pipe to within 0.5m significantly reduces internal pressure loss in the pipeline, ensuring the pressure relief valve responds quickly to pressure changes. Simultaneously, the compact structural design effectively prevents secondary blockage caused by material accumulation in the side pipe.

[0010] Optionally, the end of the pressure relief pipe is provided with a guide pipe, the diameter of which is larger than the diameter of the pressure relief pipe, and the end of the pressure relief pipe overlaps the inside of the guide pipe.

[0011] By adopting the above technical solution, a guide pipe is installed at the end of the pressure relief pipe, and the diameter of the guide pipe is larger than that of the pressure relief pipe. This effectively expands the cross-sectional area for airflow discharge, reduces airflow velocity, and minimizes the impact on the surrounding environment. Simultaneously, the end of the pressure relief pipe overlaps the inside of the guide pipe, allowing for thermal expansion and contraction, effectively preventing environmental pollution caused by slurry splashing. This structural design facilitates installation and disassembly, while also ensuring a smooth transition between gas and slag, avoiding secondary pollution or safety hazards caused by direct discharge.

[0012] Optionally, a recycling bin is provided at the end of the guide pipe.

[0013] By adopting the above technical solution, the setting of the recycling bins enables the targeted collection of depressurized emissions, which not only meets environmental protection requirements but also facilitates the recycling and reuse of valuable materials, while avoiding workshop floor pollution caused by traditional direct discharge methods.

[0014] Optionally, the diameter of the pressure relief pipe is 1 / 3 to 1 / 5 of the diameter of the main slag discharge pipe.

[0015] By adopting the above technical solution, the diameter of the pressure relief pipe is set to 1 / 3 to 1 / 5 of the diameter of the main slag discharge pipe. This ensures effective pressure relief while reducing the leakage of slurry within the pipeline. Experimental verification has shown that this ratio range optimally balances system pressure stability and slag discharge efficiency. This design avoids slurry waste caused by an excessively large pressure relief pipe and prevents the inability to release pressure in the pipeline in a timely manner due to an excessively small pressure relief pipe, thereby ensuring the stability and safety of the pipeline system operation.

[0016] Optionally, the slag discharge main pipe includes a horizontal section extending in a horizontal direction and a vertical section extending in a vertical direction, the horizontal section being connected to the vertical section, and the pressure relief port being opened in the horizontal section with the axial direction of the pressure relief port extending in a horizontal direction.

[0017] By adopting the above technical solution, the combined pipeline layout of horizontal and vertical sections can make full use of the principle of gravity settling, so that heavy slag will be deposited due to velocity decay in the horizontal section, and the horizontally set pressure relief port can accurately capture the pressure peak area, significantly improving the pressure relief effectiveness.

[0018] Optionally, the angle between the axis of the pressure relief port and the ray of the slag discharge main pipe along the slag discharge direction is an acute angle.

[0019] By adopting the above technical solution, the axis of the pressure relief port forms an acute angle with the ray of the slag discharge main pipe along the slag discharge direction, which can effectively guide the gas flow direction in the pipeline, reduce the direct impact of gas on the inner wall of the pipeline, and thus reduce the vibration amplitude of the pipeline. In addition, this design helps to optimize the airflow path, improve pressure relief efficiency, and further enhance the stability of the pipeline structure.

[0020] Optionally, a baffle net is provided inside the pressure relief port.

[0021] By adopting the above technical solution, the setting of the baffle screen forms a three-stage filtration system, which can intercept solid particles with a diameter greater than 3mm. While ensuring smooth pressure relief, it avoids large particle impurities from entering the pressure relief system and causing equipment damage.

[0022] Optionally, the baffle can be detachably installed inside the pressure relief port.

[0023] By adopting the above technical solution, the baffle screen can be detached and installed. This design allows the baffle screen to be easily removed and installed from the pressure relief port, facilitating regular cleaning, maintenance, or replacement of the baffle screen. This ensures the long-term stable operation of the flotation screen heavy slag pipeline structure and reduces pipeline vibration problems caused by baffle screen blockage.

[0024] Optionally, the pressure relief pipe is a flexible pipe.

[0025] By adopting the above technical solution, flexible pipes can effectively adapt to pressure changes within the pipeline, reducing pipeline vibration caused by pressure fluctuations. Specific effects are as follows: 1. Flexible pipes possess excellent deformation capabilities; when the air pressure within the pipeline changes, they can absorb some energy through their own deformation, thereby reducing the vibration amplitude of the pipeline system. 2. The use of flexible pipes improves the stability of the pipeline structure and extends the service life of the pipeline and related components.

[0026] Optionally, one end of the slag discharge main pipe is connected to the flotation screen via a flange, and the other end of the slag discharge main pipe is connected to a conveying pipe via a flange.

[0027] By adopting the above technical solution, convenient connection between the main slag discharge pipe and the flotation screen and other pipelines is achieved. Specific effects are as follows: 1. The flange connection provides reliable sealing and stability, ensuring that pressure fluctuations during slag discharge do not affect the reliability of the connection; 2. It facilitates disassembly and installation, which is beneficial for equipment maintenance and repair, while also improving the system's flexibility and adaptability.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. By opening a pressure relief port on the side of the slag discharge main pipe and connecting it with a pressure relief valve and a short-distance pressure relief side pipe, the pressure fluctuations caused by the opening and closing operation in the pipeline can be quickly released, effectively reducing pipeline vibration and improving the stability of equipment operation. The design of the pressure relief side pipe length being less than 0.5m ensures the high efficiency of pressure release, while avoiding the additional resistance and complexity caused by excessively long pipelines, simplifying the structure and reducing costs.

[0030] 2. The optimized location and orientation of the pressure relief port make pressure release smoother, reduce interference with the flow of fluid in the main pipeline, and further improve the reliability of the overall system.

[0031] 3. The combined horizontal and vertical pipeline layout can make full use of the principle of gravity settling, so that heavy slag will be deposited due to velocity decay in the horizontal section. The horizontally set pressure relief port can accurately capture the pressure peak area, significantly improving the pressure relief effectiveness. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0033] Figure 2 This is a front view of the overall structure of an embodiment of this application.

[0034] Figure 3 yes Figure 2 A cross-sectional view along line AA.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Flotation screen; 2. Main slag discharge pipe; 21. Horizontal section; 22. Vertical section; 3. Pressure relief port; 4. Pressure relief valve; 5. Pressure relief side pipe; 6. Guide pipe; 7. Recovery tank; 8. Baffle screen; 9. Flange; 10. Conveying pipeline. Detailed Implementation

[0037] The following will be combined with the appendix Figure 1-3The technical solutions in the embodiments of this utility model are clearly and completely described herein. The described embodiments are only possible technical implementations of this utility model and not all possible implementations. Those skilled in the art can obtain other embodiments in conjunction with the embodiments of this utility model without creative effort, and these embodiments are also within the protection scope of this utility model.

[0038] The inventors of this application discovered that in the prior art, the pressure fluctuations in the flotation screen slag discharge pipeline during opening and closing are significant due to the poor fluidity of the slag, thus causing pipeline vibration. This vibration not only affects the normal operation of the equipment but may also lead to loosening or even damage at pipeline connections, thereby affecting production efficiency and safety. Therefore, this application mainly adopts the following solution, which effectively alleviates pressure fluctuations and reduces pipeline vibration by setting up a pressure relief valve and a short pipeline structure.

[0039] This application provides an embodiment of a flotation screen heavy slag pipeline structure, referring to... Figure 1 It includes a slag discharge main pipe 2 connected to the bottom of the flotation screen 1. A pressure relief port 3 is opened on the side of the slag discharge main pipe 2. A pressure relief valve 4 is connected to the pressure relief port 3. A pressure relief side pipe 5 is connected to the discharge end of the pressure relief valve 4. The length of the pressure relief side pipe 5 is less than 0.5m, which achieves the effect of reducing pressure fluctuations in the pipeline by rapidly releasing pressure, thereby effectively reducing pipeline vibration.

[0040] Specifically, the slag discharge main pipe 2 consists of a horizontal section 21 and a vertical section 22. The horizontal section 21 can be made of carbon steel round pipe, and its diameter can be adjusted according to actual needs. For example, in common corrugated paper production lines, the diameter of the horizontal section 21 is usually 200mm-300mm. The vertical section 22 can be made of the same material as the horizontal section 21 round pipe to ensure the stability of the connection between the two. The horizontal section 21 and the vertical section 22 are connected by welding to ensure the strength and sealing of the connection.

[0041] In one embodiment, the pressure relief port 3 is located on the side of the horizontal section 21, and its axis extends horizontally. Compared with the method of setting the pressure relief port 3 at the bottom of the horizontal section 21, this allows the pressure to be discharged quickly from the pressure relief port 3, and also makes it less likely for heavy slag to accumulate downwards in the pressure relief port 3, thus reducing the occurrence of blockage.

[0042] In another preferred embodiment, the angle between the axis of the pressure relief port 3 and the ray of the slag discharge main pipe 2 along the slag discharge direction is set to an acute angle. This arrangement can better utilize the inertia of the slag, allowing some of the slag and airflow to naturally flow into the pressure relief side pipe 5, thereby further reducing the pressure in the slag discharge main pipe 2. When the slag flows in the slag discharge main pipe 2, due to the inclined arrangement of the pressure relief port 3, some of the slag will enter the pressure relief side pipe 5 along the inclined direction. This design makes full use of the movement characteristics of the slag, reducing the flow rate of the slag discharge main pipe 2 without causing excessive energy loss. Compared with a vertical arrangement, this method can more effectively balance the pressure distribution in the pipeline and further improve the pipeline vibration problem.

[0043] As a key component, the pressure relief valve 4 can be either a manual gate valve or an electric ball valve. Manual gate valves are simple to operate and suitable for frequent opening and closing operations; electric ball valves offer rapid response and are suitable for highly automated production lines. The specifications of the pressure relief valve 4 must be selected based on the dimensions of the main slag discharge pipe 2. For example, for a 200mm diameter main slag discharge pipe 2, a DN50 or DN65 valve can be selected. The material of the pressure relief valve 4 should be consistent with that of the main slag discharge pipe 2 to prevent uneven expansion caused by corrosion and temperature changes.

[0044] In a preferred embodiment, the pressure relief pipe 5 is a flexible pipe, which can be made of high-temperature resistant rubber or polyurethane. The diameter of the flexible pipe is set to 1 / 3 to 1 / 5 of the diameter of the main slag discharge pipe 2, preferably 1 / 4 of the diameter of the main slag discharge pipe 2. This ratio ensures sufficient pressure relief capacity without excessively increasing system complexity. The length of the flexible pipe is strictly controlled within 0.5m to avoid pressure transmission lag caused by excessively long pipes and to reduce energy loss.

[0045] A guide pipe 6 is provided at the end of the pressure relief pipe 5. The diameter of the guide pipe 6 is larger than that of the pressure relief pipe 5, and the end of the pressure relief pipe 5 overlaps the inside of the guide pipe 6. The guide pipe 6 is made of stainless steel, and its diameter is usually 2-3 times that of the pressure relief pipe 5. A collection bin 7 is provided at the end of the guide pipe 6 to collect the slag discharged during the pressure relief process. The collection bin 7 can be a standard plastic bin with wheels for easy movement and emptying, and its capacity is generally 200L-300L, which can meet the collection needs of one work shift.

[0046] Reference Figure 2 and Figure 3To further optimize performance, a baffle 8 is installed inside the pressure relief port 3. The baffle 8 can be made of stainless steel wire mesh or perforated steel plate, with its mesh size or aperture selected according to the characteristics of the slag material, typically 10-20 mesh. The baffle 8 is installed inside the pressure relief port 3 using bolts or clips for easy cleaning and replacement. This design prevents large particles of slag from clogging the pressure relief valve 4 without significantly hindering the normal pressure relief process.

[0047] Reference Figure 1 In a preferred embodiment, one end of the slag discharge main pipe 2 is connected to the flotation screen 1 via a flange 9. The flange 9 can be made of the same carbon steel as the slag discharge main pipe 2, and its thickness is selected according to the pipeline pressure rating, typically 20mm-30mm. The sealing surface of the flange 9 can be flat or raised, and is equipped with a high-temperature resistant rubber gasket to ensure good sealing performance. The other end of the slag discharge main pipe 2 is connected to a conveying pipe 10 via the flange 9. The flange 9 interface size of the conveying pipe 10 should match that of the slag discharge main pipe 2 to ensure reliable connection. This design facilitates the maintenance and repair of the slag discharge main pipe 2, while improving the system's flexibility and adaptability.

[0048] The implementation principle of this embodiment is as follows: by setting a pressure relief port 3 on the side of the slag discharge main pipe 2 and connecting it to a pressure relief valve 4 and a pressure relief side pipe 5, excessive pressure in the pipeline can be quickly released. The use of flexible pipes gives the pipeline a certain degree of elasticity, which can buffer pressure fluctuations. The cooperation between the guide pipe 6 and the recovery bucket 7 achieves the orderly discharge of slag, avoiding environmental pollution. The overall structure of this application is simple and reliable, easy to maintain, and can effectively reduce pipeline vibration and improve equipment operation stability.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A flotation screen heavy slag pipeline structure, characterized in that, Includes a slag discharge main pipe (2) connected to the bottom of the flotation screen (1), the slag discharge main pipe (2) has a pressure relief port (3) on its side, the pressure relief port (3) is connected to a pressure relief valve (4), the discharge end of the pressure relief valve (4) is connected to a pressure relief side pipe (5), and the length of the pressure relief side pipe (5) is less than 0.5m.

2. The flotation screen heavy slag pipeline structure according to claim 1, characterized in that: The pressure relief pipe (5) has a guide pipe (6) at its end. The diameter of the guide pipe (6) is larger than the diameter of the pressure relief pipe (5). The end of the pressure relief pipe (5) overlaps the inside of the guide pipe (6).

3. The flotation screen heavy slag pipeline structure according to claim 2, characterized in that: The end of the guide pipe (6) is provided with a recycling bin (7).

4. The flotation screen heavy slag pipeline structure according to claim 1, characterized in that: The diameter of the pressure relief pipe (5) is 1 / 3 to 1 / 5 of the diameter of the slag discharge main pipe (2).

5. The flotation screen heavy slag pipeline structure according to claim 1, characterized in that: The slag discharge main pipe (2) includes a horizontal section (21) extending in the horizontal direction and a vertical section (22) extending in the vertical direction. The horizontal section (21) is connected to the vertical section (22). The pressure relief port (3) is opened in the horizontal section (21) and the axial direction of the pressure relief port (3) extends in the horizontal direction.

6. The flotation screen heavy slag pipeline structure according to claim 5, characterized in that: The angle between the axis of the pressure relief port (3) and the ray of the slag discharge main pipe (2) along the slag discharge direction is an acute angle.

7. The flotation screen heavy slag pipeline structure according to claim 1, characterized in that: The pressure relief port (3) is equipped with a baffle (8).

8. The flotation screen heavy slag pipeline structure according to claim 7, characterized in that: The baffle (8) can be detachably installed inside the pressure relief port (3).

9. The flotation screen heavy slag pipeline structure according to claim 1, characterized in that: The pressure relief pipe (5) is a flexible pipe.

10. The flotation screen heavy slag pipeline structure according to claim 1, characterized in that: One end of the slag discharge main pipe (2) is connected to the flotation screen (1) via a flange (9), and the other end of the slag discharge main pipe (2) is connected to a conveying pipe (10) via a flange (9).

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