A special-shaped bar screen structure

Abstract

The utility model discloses a special-shaped bar sieve structure, include: bar sieve, and the bar sieve even interval week is equipped along the pressure container inner wall of digester, and the both sides of bar sieve are provided with the side plate respectively, and even interval is provided with a plurality of special-shaped bars along the side plate height and width, and the top and bottom of a plurality of special-shaped bars are provided with the baffle respectively, and even interval is provided with a plurality of bracket along the special-shaped bar length, and the both sides of bracket are connected with the side plate of both sides respectively, and the pressure container inner wall of digester is provided with sieve plate support, and the bar sieve is connected with the pressure container inner wall of digester through sieve plate support. The special-shaped bar sieve structure effectively improves the structure stability of special-shaped bar on the bar sieve, so that when the force exerted on the bar sieve by the pulp column acts on the special-shaped bar, the possibility of deformation or even rupture of the special-shaped bar can be reduced, and the local deviation of the container inner wall and the cylindrical shape can be better adapted, and the problem of difficult installation caused by local deviation is overcome.

Description

Technical Field

[0001] This utility model belongs to the field of cooking equipment technology, specifically a non-standard bar screen structure. Background Technology

[0002] In pulp production, digester containers are large cylindrical pressure vessels, ranging from several meters to over ten meters in diameter. Due to manufacturing errors, corrosion, or sediment accumulation, the inner wall of the container often exhibits local deviations from the ideal cylindrical shape, posing challenges to the installation and support of the screens. Traditional screens are generally divided into two categories: one is the irregular bar screen, which is typically a self-supporting structure with the load borne by a peripheral frame, offering a large recovery area but requiring a robust frame bed; the other is the slotted screen, which has a weaker structure and relies on numerous support rods or support boxes directly against the container wall for support. Each support rod needs to be individually adjusted in length to accommodate irregular wall surfaces, making installation time-consuming and labor-intensive. When replacing a slotted screen with an irregular bar screen, the frame bed needs to be rebuilt, while systems using support rods face problems of complex adjustments, easy bending, or breakage.

[0003] Chinese patent CN104053834A discloses a shaped bar screen for use in digester containers, used to discharge treatment liquid from a suspension of pulverized cellulose material and treatment liquid in a generally cylindrical digester container. The same robust shaped bar screen can be installed more quickly and has optimized load support. However, the support arch structure of this shaped bar screen is complex. Each horizontal support arch needs to be machined, and the vertical mounting slots on it require high-precision machining to ensure that all slots are aligned; otherwise, the shaped bars cannot be installed smoothly. Furthermore, the extended slits designed on the support arch to provide flexibility further increase the processing complexity and cost of the support arch. In addition, if a shaped bar in the middle is damaged, it needs to be pulled out from a row of continuous support arch slots, and the surrounding bars need to be removed first, resulting in difficult operation and high operating space requirements, which cannot meet the needs of digester pressure vessels.

[0004] Therefore, there is an urgent need for a non-standard bar screen structure to improve the structural stability of the non-standard bars on the bar screen, to ensure that when the force applied by the pulp column to the bar screen acts on the non-standard bars, the possibility of deformation or even breakage of the non-standard bars can be reduced, and to overcome the problem of installation difficulties caused by local deviations between the inner wall of the container and the cylindrical shape. Utility Model Content

[0005] The purpose of this invention is to provide a non-standard bar screen structure to solve at least one aspect of the problems and defects mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A non-standard bar screen structure includes: A bar screen, wherein the bar screen is evenly spaced around the inner wall of the pressure vessel of the cooker; The bar screen is provided with side plates on both sides. Several irregularly shaped bars are evenly spaced along the height and width of the side plate; A baffle is provided at the top and bottom of several of the irregularly shaped bars; Several brackets are evenly arranged along the length of the irregularly shaped bar, and the two sides of the brackets are respectively connected to the side plates on both sides; The pressure vessel of the cooker is provided with a sieve plate support on its inner wall, and the bar sieve is connected to the pressure vessel of the cooker through the sieve plate support.

[0007] The irregular bar screen structure according to the present invention has at least the following technical effects: This shaped bar screen structure effectively improves the structural stability of the shaped bars by setting side plates on both sides of the screen, setting baffles at the top and bottom of several shaped bars, and evenly setting several brackets along the length of the shaped bars. This ensures that when the force applied by the pulp column to the bar screen is applied to the shaped bars, the possibility of deformation or even breakage of the shaped bars is reduced, thus guaranteeing the performance and lifespan of the bar screen. The force is transmitted to the inner wall of the digester pressure vessel through the screen plate support, which can better adapt to the local deviation between the inner wall of the vessel and the cylindrical shape, and overcome the installation difficulties caused by the local deviation between the inner wall of the vessel and the cylindrical shape. Moreover, compared with the existing shaped bar screens, its structure is simplified, while still maintaining the high efficiency of the shaped bar screen, meeting the usage requirements of the digester pressure vessel.

[0008] As a further embodiment of this utility model: the top and bottom of the bar screen are respectively provided with arc-shaped connecting plates, the inner wall of the pressure vessel of the cooker is also provided with a first support plate and a drainage channel, the arc-shaped connecting plate at the top of the bar screen is connected to the first support plate, and the arc-shaped connecting plate at the bottom of the bar screen is connected to the drainage channel.

[0009] Because the bar screen is equipped with arc-shaped connecting plates at the top and bottom, and the pressure vessel of the cooker is also equipped with a first support plate and a drainage channel, the arc-shaped connecting plate at the top of the bar screen is connected to the first support plate, and the arc-shaped connecting plate at the bottom of the bar screen is connected to the drainage channel. This effectively further fixes the entire bar screen, restricts the displacement of the bar screen in the vertical and horizontal directions, and makes it more firmly installed in the cooker. This reduces loosening or shaking caused by factors such as vibration and fluid impact, thereby ensuring the stability of the screen body during long-term operation.

[0010] As a further embodiment of this utility model: a plurality of interconnected recovery chambers are provided between the shaped bar and the inner wall of the pressure vessel of the cooker, and the bottommost recovery chamber is connected to the drain channel.

[0011] As a further improvement of this utility model, a drainage hole is provided inside the drainage channel.

[0012] As a further embodiment of this utility model: a total recovery chamber is provided at the bottom of the drainage channel, and a drainage pipe is provided on one side of the total recovery chamber.

[0013] By setting up several interconnected recovery chambers between the shaped bars and the inner wall of the pressure vessel of the digester, with the bottommost recovery chamber connected to the drainage channel, and a total recovery chamber located at the bottom of the drainage channel, and a drain pipe on one side of the total recovery chamber, the recovery chambers can effectively recover the treated liquor. The treated liquor flows from the slits between adjacent shaped bars into the recovery chamber, then flows into the total recovery chamber through the drainage channel, and finally is recovered from the digester by the drain pipe on one side of the total recovery chamber. This reduces the residue of the treated liquor in the digester and improves resource utilization. Furthermore, the drain holes in the drainage channel are designed with specific dimensions to control the total flow rate of the treated liquor discharged, which helps to optimize the entire pulp production process and make the entire production process more coordinated and efficient.

[0014] As a further embodiment of this utility model: the inner wall of the pressure vessel of the cooking appliance is further provided with a second support plate, and the total recovery chamber is located on top of the second support plate.

[0015] Because the pressure vessel of the digester is also equipped with a second support plate, the total recovery chamber is located on top of the second support plate. The second support plate provides a solid support foundation for the total recovery chamber, which is used to collect the treatment liquid flowing in from the drain. As the treatment liquid accumulates, its weight will gradually increase. The second support plate can bear the weight of the total recovery chamber and the treatment liquid inside, ensuring the stability of the total recovery chamber in the digester and preventing the total recovery chamber from sinking, tilting or shifting due to gravity. This ensures the integrity and stability of the entire irregular bar screen structure.

[0016] As a further improvement of this utility model, an inspection plate is also provided on the side of the total recycling chamber away from the drain pipe.

[0017] By installing an inspection plate on the side of the main recovery chamber away from the drain pipe, not only can the main recovery chamber be kept relatively closed to prevent leakage of the processing liquid, but it can also effectively guide the flow of wood chips and cooking liquor, preventing them from accumulating in the gaps between the bar screen and the inner wall of the digester. This helps to improve the pulp cooking effect, ensuring that the wood chips and cooking liquor are in full contact, guaranteeing the full cooking reaction, and preventing them from accumulating in the gaps. At the same time, the inspection port on the inspection plate allows for convenient inspection and cleaning of the main recovery chamber and the drain pipe, ensuring the continuity and stability of the production process.

[0018] As a further improvement of this utility model, the baffle is a comb-shaped baffle.

[0019] Because the baffle is a grate-shaped baffle, although the grate-shaped baffle also needs to be slotted, compared with the existing support structure, only two grate-shaped baffles are needed, located at the top and bottom of the irregular bar respectively, which can effectively support and limit the irregular bar, greatly reducing the processing cost, and facilitating the maintenance and replacement of the irregular bar, thus improving work efficiency.

[0020] As a further improvement of this utility model, the bracket is a square bracket.

[0021] Because the bracket is a square bracket, which uses standard steel or simple machined bars and does not require complex continuous slots, it greatly saves raw material costs, reduces processing steps and processing time, and thus lowers processing costs.

[0022] As a further improvement of this utility model, the irregularly shaped bar is made of stainless steel.

[0023] In the pulp production process, cooking liquor is usually highly corrosive. Because the special-shaped bars are made of stainless steel, they can be used for a long time in this harsh chemical environment without being corroded. This prevents the special-shaped bars from being damaged by corrosion, ensures their structural integrity and performance stability, and guarantees the normal operation of the equipment and the continuity of pulp production. Attached Figure Description

[0024] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of an irregularly shaped bar screen structure; Figure 2 This is a schematic diagram of a non-shaped bar screen installed on the inner wall of a pressure vessel in a cooker. Figure 3 This is a partial cross-sectional view of a non-standard bar screen installed on the inner wall of a pressure vessel in a cooker.

[0026] Figure label: 1. Bar screen; 2. Cooker; 3. Side plate; 4. Shaped bars; 5. Baffle; 6. Bracket; 7. Screen plate support; 8. Arc-shaped connecting plate; 9. First support plate; 10. Drainage channel; 11. Recycling chamber; 12. Main recycling chamber; 13. Drain pipe; 14. Second support plate; 15. Inspection plate. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0028] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0030] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0033] like Figure 1-3 The present invention, as shown in this embodiment, provides a non-standard bar screen structure, comprising: a bar screen 1, which is evenly spaced along the inner wall of the pressure vessel of a cooker 2; side plates 3 are respectively provided on both sides of the bar screen 1, and a plurality of non-standard bars 4 are evenly spaced along the height and width of the side plates 3; baffles 5 are respectively provided at the top and bottom of the plurality of non-standard bars 4; a plurality of brackets 6 are evenly provided along the length of the non-standard bars 4, and the two sides of the brackets 6 are respectively connected to the side plates 3 on both sides; a screen plate support 7 is provided on the inner wall of the pressure vessel of the cooker 2, and the bar screen 1 is connected to the inner wall of the pressure vessel of the cooker 2 through the screen plate support 7.

[0034] Specifically, this irregular bar screen structure, by setting side plates 3 on both sides of the bar screen 1, setting baffles 5 on the top and bottom of several irregular bars 4, and evenly setting several brackets 6 along the length of the irregular bars 4, can effectively improve the structural stability of the irregular bars 4 on the bar screen 1. When the force applied by the pulp column to the bar screen 1 acts on the irregular bars 4, it can ensure that the possibility of deformation or even breakage of the irregular bars 4 is reduced, thus ensuring the performance and service life of the bar screen 1. The force is transmitted to the inner wall of the pressure vessel of the digester 2 through the screen plate bracket 7, which can better adapt to the local deviation between the inner wall of the vessel and the cylindrical shape, and overcome the problem of installation difficulties caused by the local deviation between the inner wall of the vessel and the cylindrical shape. Moreover, compared with the existing irregular bar screen, its structure is simplified. While simplifying the structure, it can still maintain the high efficiency of the irregular bar screen and meet the usage requirements of the pressure vessel of the digester 2.

[0035] Furthermore, such as Figure 1 As shown, the top and bottom of the bar screen 1 are respectively provided with arc-shaped connecting plates 8, and the inner wall of the pressure vessel of the cooker 2 is also provided with a first support plate 9 and a drainage channel 10. The arc-shaped connecting plate 8 at the top of the bar screen 1 is connected to the first support plate 9, and the arc-shaped connecting plate 8 at the bottom of the bar screen 1 is connected to the drainage channel 10.

[0036] Specifically, since the top and bottom of the bar screen 1 are respectively provided with arc-shaped connecting plates 8, and the inner wall of the pressure vessel of the cooker 2 is also provided with a first support plate 9 and a drainage channel 10, the arc-shaped connecting plate 8 at the top of the bar screen 1 is connected to the first support plate 9, and the arc-shaped connecting plate 8 at the bottom of the bar screen 1 is connected to the drainage channel 10, the entire bar screen 1 can be further fixed, constraining the displacement of the bar screen 1 in the vertical and horizontal directions, making it more firmly installed in the cooker, reducing loosening or shaking caused by factors such as vibration and fluid impact, thereby ensuring the stability of the screen body during long-term operation.

[0037] Furthermore, such as Figure 3 As shown, several interconnected recovery chambers 11 are provided between the shaped bar 4 and the inner wall of the pressure vessel of the cooker 2. The bottom recovery chamber is connected to the drain channel 10. A drain hole is provided in the drain channel 10. A total recovery chamber 12 is provided at the bottom of the drain channel 10. A drain pipe 13 is provided on one side of the total recovery chamber 12.

[0038] Specifically, by setting several interconnected recovery chambers 11 between the shaped bars 4 and the inner wall of the pressure vessel of the digester 2, the bottom recovery chamber 11 is connected to the drainage channel 10, and a total recovery chamber 12 is set at the bottom of the drainage channel 10. A drain pipe 13 is set on one side of the total recovery chamber 12. This allows the recovery chambers 11 to effectively recover the processing liquid. The processing liquid flows from the slit between adjacent shaped bars 4 to the recovery chamber 11, and then flows into the total recovery chamber 12 through the drainage channel 10. Finally, the processing liquid is recovered from the digester 2 by the drain pipe 13 on one side of the total recovery chamber 12. This reduces the residue of the processing liquid in the digester 2 and improves the resource utilization rate. In addition, the drain holes in the drainage channel 10 are designed with specific dimensions to control the total flow rate of the processing liquid discharged, which helps to optimize the entire pulp production process and make the entire production process more coordinated and efficient.

[0039] Furthermore, the inner wall of the pressure vessel of the cooker 2 is also provided with a second support plate 14, and the total recovery chamber 12 is located on top of the second support plate 14.

[0040] Specifically, since the inner wall of the pressure vessel of the cooker 2 is also provided with a second support plate 14, the total recovery chamber 12 is located on top of the second support plate 14. The second support plate 14 provides a solid support foundation for the total recovery chamber 12. The total recovery chamber 12 is used to collect the treatment liquid flowing in from the drain 10. As the treatment liquid accumulates, its weight will gradually increase. The second support plate 14 can bear the weight of the total recovery chamber 12 and the treatment liquid inside, ensuring that the position of the total recovery chamber 12 in the cooker 2 is stable, avoiding the sinking, tilting or displacement of the total recovery chamber 12 due to gravity, and ensuring the integrity and stability of the entire irregular bar screen structure.

[0041] Furthermore, an inspection panel 15 is also provided on the side of the main recycling chamber 12 away from the drain pipe 13.

[0042] Specifically, by installing an inspection plate 15 on the side of the total recycling chamber 12 away from the drain pipe 13, not only can the total recycling chamber be kept in a relatively closed environment to prevent leakage of the processing liquid, but it can also effectively guide the flow of wood chips and cooking liquor, preventing wood chips and cooking liquor from accumulating in the gap between the bar screen and the inner wall of the digester 2. This helps to improve the pulp cooking effect, allowing the wood chips to fully contact the cooking liquor, ensuring the full progress of the cooking reaction, and preventing them from accumulating in the gap. At the same time, the inspection port on the inspection plate can facilitate the inspection and cleaning of the total recycling chamber and the drain pipe, ensuring the continuity and stability of the production process.

[0043] According to an embodiment of the present invention, the baffle 5 is a comb-shaped baffle.

[0044] Specifically, since the baffle 5 is a grate-shaped baffle, although the grate-shaped baffle also needs to be slotted, compared with the existing support structure, only two grate-shaped baffles are needed, located at the top and bottom of the irregular bar 4 respectively, which can effectively support and limit the irregular bar 4, greatly reducing the processing cost, and facilitating the maintenance and replacement of the irregular bar 4, thus improving work efficiency.

[0045] According to an embodiment of the present invention, the bracket 6 is a square bracket.

[0046] Specifically, since bracket 6 is a square bracket, and square brackets are made of standard steel or simple machined bars, and there is no need to open complex continuous slots, the cost of raw materials is greatly saved, the processing steps and processing time are reduced, and thus the processing cost is reduced.

[0047] It should also be noted that the irregularly shaped bar 4 is made of stainless steel.

[0048] Specifically, in the pulp production process, the cooking liquor is usually highly corrosive. Since the special-shaped bar 4 is made of stainless steel, it can be used for a long time in this harsh chemical environment without being corroded, preventing damage to the special-shaped bar 4 due to corrosion, ensuring its structural integrity and performance stability, and guaranteeing the normal operation of the equipment and the continuity of pulp production.

[0049] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A non-circular bar screen structure, characterized in that, include: A bar screen, wherein the bar screen is evenly spaced around the inner wall of the pressure vessel of the cooker; The bar screen is provided with side plates on both sides. Several irregularly shaped bars are evenly spaced along the height and width of the side plate; A baffle is provided at the top and bottom of several of the irregularly shaped bars; Several brackets are evenly arranged along the length of the irregularly shaped bar, and the two sides of the brackets are respectively connected to the side plates on both sides; The pressure vessel of the cooker is provided with a sieve plate support on its inner wall, and the bar sieve is connected to the pressure vessel of the cooker through the sieve plate support.

2. The irregularly shaped bar screen structure according to claim 1, characterized in that, The top and bottom of the bar screen are respectively provided with arc-shaped connecting plates. The inner wall of the pressure vessel of the cooker is also provided with a first support plate and a drainage channel. The arc-shaped connecting plate at the top of the bar screen is connected to the first support plate, and the arc-shaped connecting plate at the bottom of the bar screen is connected to the drainage channel.

3. The irregularly shaped bar screen structure according to claim 2, characterized in that, Several interconnected recovery chambers are provided between the shaped bars and the inner wall of the pressure vessel of the cooker, and the bottommost recovery chamber is connected to the drain.

4. The irregularly shaped bar screen structure according to claim 3, characterized in that, The drainage channel is equipped with drainage holes.

5. The irregularly shaped bar screen structure according to claim 4, characterized in that, A main recovery chamber is provided at the bottom of the drainage channel, and a drain pipe is provided on one side of the main recovery chamber.

6. The irregularly shaped bar screen structure according to claim 5, characterized in that, The pressure vessel of the cooker is also provided with a second support plate on its inner wall, and the total recovery chamber is located on top of the second support plate.

7. The irregular bar screen structure according to claim 6, characterized in that, An inspection panel is also installed on the side of the main recovery chamber away from the drain pipe.

8. The irregularly shaped bar screen structure according to claim 1, characterized in that, The baffle is a comb-shaped baffle.

9. The irregularly shaped bar screen structure according to claim 1, characterized in that, The bracket is a square bracket.

10. The irregularly shaped bar screen structure according to any one of claims 1 to 9, characterized in that, The irregularly shaped bars are made of stainless steel.

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