Press roll

Abstract

The utility model belongs to the technical field of papermaking equipment, and particularly relates to a press roll which comprises a roll shaft, a press roll body and a press roll cover. The hydraulic cylinder is arranged in the roller shaft; the supporting shell is arranged outside the roller shaft, and a first gap is formed between the supporting shell and the roller shaft; the bearing is arranged in the second gap; the rotating roller sleeve is arranged outside the supporting shell, and a second gap is formed between the rotating roller sleeve and the supporting shell; an output shaft of the hydraulic cylinder penetrates through the roller shaft and then is fixedly connected with the supporting shell. Compared with the prior art, the press roll has the advantages that the interior of the roll shaft is of the hollow structure and is provided with the first gap and the second gap, compared with a solid structure, by means of the design, the use of materials is greatly reduced, the overall weight of the press roll is effectively reduced, the requirement for hoisting equipment is lowered, and then the capital construction cost and maintenance difficulty of a plant are lowered.

Description

Technical Field

[0001] This application belongs to the field of papermaking equipment technology, and in particular relates to a press roll. Background Technology

[0002] The papermaking process mainly includes pulping, conditioning, papermaking, and finishing. The papermaking process primarily involves evenly weaving and forming a thin pulp on a forming wire, followed by pressing and drying to form paper. Pressing involves introducing the wet paper formed on the forming wire between forming rolls covered with felt. Through the squeezing action of the forming rolls and the water absorption of the felt, the wet paper is further dehydrated, making the paper more compact and improving its strength.

[0003] Meanwhile, in the papermaking industry, press rolls, as the core component for dewatering wet paper sheets, directly affect the dryness of the finished paper and the energy consumption of the equipment due to their structural strength and operating efficiency. Traditional press roll designs generally use cast iron or cast steel, increasing bending stiffness by increasing wall thickness (usually 50-80mm) or incorporating dense reinforcing ribs to meet the high linear pressure requirements of papermaking machines with a width of 6 meters or more. However, such structures often result in a heavier single roll, requiring 200-ton lifting equipment, significantly increasing plant infrastructure costs and maintenance difficulty18, thus necessitating improvements. Summary of the Invention

[0004] The purpose of this application is to provide a press roller that can solve the above-mentioned problems.

[0005] The purpose of this application is to provide a press roller, comprising:

[0006] The roller has a hollow internal structure.

[0007] Hydraulic cylinder, located inside the roller shaft;

[0008] A support shell is disposed outside the roller shaft and forms a first gap with the roller shaft;

[0009] The bearing is positioned within the second clearance.

[0010] A rotating roller sleeve is disposed outside the support shell and forms a second gap with the support shell;

[0011] The output shaft of the hydraulic cylinder passes through the roller shaft and is fixedly connected to the support shell.

[0012] The aforementioned type of press roller, traditionally made of cast iron or cast steel, relies on increased wall thickness or internal dense reinforcing ribs to improve bending stiffness, resulting in a heavy single roller weight. In contrast, the press roller of this application features a hollow internal structure with a first gap and a second gap. This design significantly reduces material usage compared to a solid structure, effectively lightening the overall weight of the press roller, reducing the requirements for lifting equipment, and consequently lowering factory infrastructure costs and maintenance difficulty.

[0013] The hydraulic cylinder is located inside the roller shaft. Through control, it can adjust the support force in different areas in real time to compensate for deformation of the outer roller shell caused by load or temperature changes. For example, when the roller shell experiences uneven localized stress, the hydraulic cylinder can adjust the pressure on the support shell to make the stress distribution more uniform. Simultaneously, the support force of the hydraulic cylinder can balance the external pressing force, for example, by using a balancing device to counteract the force in the pressing zone, reducing the deflection deformation of the roller shell, thereby reducing the alternating stress on the bearings and roller bearings, and extending the equipment's lifespan.

[0014] In addition, the bearing is installed in the second gap, allowing the rotating roller sleeve to rotate freely relative to the support shell. The bearing reduces the wear caused by rotation, which is beneficial for paper transport and improves pressing efficiency.

[0015] Furthermore, multiple hydraulic cylinders are provided, which are evenly and spaced apart inside the roller, and each hydraulic cylinder is connected to a drive device.

[0016] Installing multiple hydraulic cylinders can significantly improve performance through synergistic action. In papermaking machines, the coordinated dynamic adjustment of the roll shell deflection by multiple cylinders achieves a uniform lateral distribution of pressure in the pressure zone, preventing uneven paper dehydration. The patented drive device is explained as follows: the hydraulic cylinders are connected to an oil pump via pipelines, and the pressure is regulated by a pressure control valve and a pressure regulator.

[0017] Furthermore, the roller shaft is provided with multiple through holes for the hydraulic cylinder output shaft to pass through, and linear bearings are installed in the through holes.

[0018] Installing linear bearings within the through-holes of the roller shaft provides a precise guide path for the hydraulic cylinder output shaft. Linear bearings, with their low coefficient of friction and high motion accuracy, effectively reduce radial runout and yaw during reciprocating motion, ensuring accurate and stable output shaft trajectory. Simultaneously, a support base is installed on the hydraulic cylinder output shaft, and this support base is fixedly connected to the support housing. This effectively prevents the support base from rotating when the output shaft rotates or is subjected to external forces, making the connection between the support base and the support housing more robust and reliable. The fixed connection between the support base and the support housing increases the contact area between them, resulting in more uniform pressure transmission and reducing localized stress concentration.

[0019] Furthermore, sealing caps are provided at both ends of the roller shaft, and the sealing caps are fixed to the roller shaft by fastening screws.

[0020] By installing sealing caps at both ends of the roller and securing them firmly to the roller with fastening screws, it is possible to effectively prevent external impurities such as dust, moisture, and fiber debris from entering the roller. Once these impurities enter, they may adhere to critical components such as pressure cylinders and linear bearings, affecting their normal movement and lubrication performance, leading to accelerated wear, decreased precision, or even damage. The presence of the sealing caps provides a relatively clean working environment for the internal components, extending their service life.

[0021] Furthermore, the support shell is provided with a mounting protrusion extending toward the roller shaft, and the roller shaft is provided with a limiting stop that contacts the mounting protrusion. The limiting stop is used to restrict the position of the mounting protrusion.

[0022] A mounting protrusion extending towards the roller shaft is installed on the support shell, and a limiting stop is installed on the roller shaft to contact the protrusion, providing positioning for the support shell on the roller shaft. The cooperation between the mounting protrusion and the limiting stop effectively restricts the axial displacement of the support shell on the roller shaft, preventing axial movement of the support shell during operation and ensuring that the relative position between the support shell and the roller shaft remains stable when the press roller is running at high speed, thereby improving the operating accuracy and stability of the press roller.

[0023] Meanwhile, a limiting stop is used to block the mounting protrusion. The mounting protrusion is fixed to the support shell with screws, and the limiting stop is also fixed to the roller shaft with screws. This modular installation method makes the assembly and disassembly of the support shell and the roller shaft more convenient and quick. Similarly, when maintaining the equipment or replacing parts, the support shell can be easily removed from the roller shaft simply by loosening the corresponding screws, shortening the installation and disassembly time of the equipment and improving work efficiency.

[0024] Furthermore, the rotating roller sleeve is provided with retaining rings at both ends. The inner wall of the retaining ring contacts the outer wall of the support shell and seals both ends of the first gap, so that the first gap forms a closed space.

[0025] By installing retaining rings at both ends of the rotating roller sleeve, whose inner walls are in close contact with the outer wall of the support shell, the two ends of the first gap can be sealed, successfully constructing a closed space in the first gap. This effectively prevents external impurities such as dust, moisture, and fiber debris from entering, providing a good storage environment for the lubricating medium present in the first gap, preventing lubricating medium leakage, ensuring the normal operation of the bearing, and ensuring that the relative movement between the rotating roller sleeve and the support shell is always in a good lubrication state, reducing wear between components and extending the service life of the equipment.

[0026] The retaining ring is fixed to the rotating roller sleeve with screws and rotates together with the rotating roller sleeve, ensuring a firm and reliable connection between the retaining ring and the rotating roller sleeve, preventing loosening or detachment during operation. Simultaneously, the synchronous rotation of the retaining ring and the rotating roller sleeve keeps the closed state of the first gap stable and unaffected by relative movement of components, further improving the operational stability of the equipment.

[0027] In addition, a sealing ring is installed between the retaining ring and the mounting protrusion. An isolation plate is installed on the outside of the retaining ring by screws. The isolation plate contacts the sealing ring. The sealing ring can effectively fill the tiny gap between the retaining ring and the mounting protrusion, preventing external impurities from entering the first gap through this gap. Combined with the sealing effect of the retaining ring, a double sealing guarantee is formed, which improves the sealing performance of the first gap.

[0028] Furthermore, the inner wall of the rotating roller sleeve is provided with an inner annular groove adapted to the bearing.

[0029] The inner wall of the rotating roller sleeve has an inner ring groove that fits the bearing, which provides a positioning reference for the bearing installation. When installing the bearing, the bearing can be accurately embedded in the inner ring groove, avoiding problems such as bearing eccentricity and tilting caused by installation position deviation. This ensures the installation accuracy of the bearing in the rotating roller sleeve and lays the foundation for the smooth operation of the press roller.

[0030] The beneficial effects of this application are:

[0031] 1. The press roller of this application has a hollow structure inside the roller shaft and has a first gap and a second gap. Compared with the solid structure, this design greatly reduces the use of materials, effectively reduces the overall weight of the press roller, reduces the requirements for lifting equipment, and thus reduces the cost of factory construction and maintenance difficulty.

[0032] 2. The hydraulic cylinder is located inside the roller shaft. Through control, the hydraulic cylinder can adjust the support force in different areas in real time to compensate for deformation of the outer roller shell caused by load or temperature changes. For example, when the roller shell experiences uneven local stress, the hydraulic cylinder can change the pressure on the support shell to make the stress distribution more uniform.

[0033] 3. The supporting force of the hydraulic cylinder can be balanced with the external pressing force. For example, the force of the pressing zone can be offset by the balancing device, reducing the deflection deformation of the roller shell, thereby reducing the alternating stress on the bearings and roller bearings and extending the service life of the equipment. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of this utility model;

[0035] Figure 2 This is a cross-sectional schematic diagram of part of the internal structure of this utility model;

[0036] Figure 3yes Figure 2 Enlarged view of A in the middle;

[0037] Figure 4 yes Figure 3 A magnified view of B in the middle.

[0038] The reference numerals in the figure are as follows: 100, roller shaft; 110, through hole; 120, linear bearing; 130, sealing cover; 200, hydraulic cylinder; 300, support shell; 310, first gap; 400, bearing; 500, rotating roller sleeve; 510, inner ring groove; 520, second gap; 600, mounting protrusion; 700, limiting stop; 800, retaining ring; 810, sealing ring; 820, isolation plate. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0040] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0041] The press roller provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0042] Example 1:

[0043] like Figures 1 to 4 As shown, an embodiment of this application provides a press roller, including:

[0044] Roller 100 has a hollow internal structure;

[0045] Hydraulic cylinder 200 is installed inside roller 100;

[0046] The support shell 300 is disposed outside the roller 100 and forms a first gap 310 between it and the roller 100;

[0047] Bearing 400 is disposed within the second clearance 520;

[0048] A rotating roller sleeve 500 is disposed outside the support shell 300 and forms a second gap 520 between it and the support shell 300;

[0049] The output shaft of the hydraulic cylinder 200 passes through the roller shaft 100 and is fixedly connected to the support shell 300.

[0050] In some embodiments of this application, such as Figure 1 As shown, traditional press rollers, made of cast iron or cast steel, rely on increased wall thickness or internal dense reinforcing ribs to improve bending stiffness, resulting in a heavy single roller weight. In contrast, the press roller of this application features a hollow internal structure for the roller shaft 100, with a first gap 310 and a second gap 520. This design significantly reduces material usage compared to a solid structure, effectively reducing the overall weight of the press roller, lowering the requirements for lifting equipment, and consequently reducing factory infrastructure costs and maintenance difficulty.

[0051] Hydraulic cylinder 200 is installed inside roller 100. Through control, hydraulic cylinder 200 can adjust the support force in different areas in real time to compensate for deformation of the outer roller shell caused by load or temperature changes. For example, when the roller shell experiences uneven local stress, hydraulic cylinder 200 can adjust the pressure of support shell 300 to make the stress distribution more uniform. Simultaneously, the support force of hydraulic cylinder 200 can balance the external pressing force, for example, by using a balancing device to counteract the force of the pressing zone, reducing the deflection deformation of the roller shell, thereby reducing the alternating stress on bearing 400 and roller 100 and extending the equipment's lifespan.

[0052] In addition, the bearing 400 is installed in the second gap 520, and the rotating roller sleeve 500 can rotate freely relative to the support shell 300. Under the action of the bearing 400, the wear caused by rotation is reduced, which is beneficial to paper conveying and improves pressing efficiency.

[0053] Furthermore, sealing caps 130 are provided at both ends of the roller 100, and the sealing caps 130 are fixed to the roller 100 by fastening screws.

[0054] By installing sealing caps 130 at both ends of the roller 100 and securing them firmly to the roller 100 with fastening screws, external impurities such as dust, moisture, and fiber debris can be effectively prevented from entering the interior of the roller 100. Once these impurities enter, they may adhere to critical components such as the pressure cylinder and linear bearing 120, affecting their normal movement and lubrication performance, leading to accelerated wear, decreased precision, or even damage. The presence of the sealing caps 130 provides a relatively clean working environment for the internal components, extending their service life.

[0055] Example 2:

[0056] This application provides a press roller, which, in addition to the above-mentioned technical features, also includes the following technical features.

[0057] As shown in Figure 3, multiple hydraulic cylinders 200 are provided. The multiple hydraulic cylinders 200 are evenly and spaced inside the roller 100, and each hydraulic cylinder 200 is connected to a drive device.

[0058] In this embodiment, installing multiple hydraulic cylinders 200 can significantly improve performance through synergistic action. In a paper machine, the roller shell deflection is dynamically adjusted in coordination among multiple cylinders, achieving a uniform lateral distribution of pressure in the pressure zone and avoiding uneven paper dehydration. The patent explains the driving device as follows: the hydraulic cylinders 200 are connected to an oil pump via pipelines, and the pressure is regulated by a pressure control valve and a pressure regulator.

[0059] Furthermore, the roller 100 is provided with multiple through holes 110 through which the output shaft of the hydraulic cylinder 200 passes, and a linear bearing 120 is provided in the through hole 110.

[0060] A linear bearing 120 is installed within the through hole 110 of the roller 100, providing a precise guide path for the output shaft of the hydraulic cylinder 200. The linear bearing 120 has a low coefficient of friction and high motion accuracy, effectively reducing radial runout and yaw during reciprocating motion of the output shaft, ensuring accurate and stable motion trajectory. Simultaneously, a support seat is installed on the output shaft of the hydraulic cylinder 200, and the support seat is fixedly connected to the support housing 300. This effectively prevents the support seat from rotating when the output shaft rotates or is subjected to external forces, making the connection between the support seat and the support housing 300 more robust and reliable. The fixed connection between the support seat and the support housing 300 increases the contact area between them, resulting in more uniform pressure transmission and reducing localized stress concentration.

[0061] Example 3:

[0062] This application provides a press roller, which, in addition to the above-mentioned technical features, also includes the following technical features.

[0063] like Figure 3 and Figure 4 As shown, the support shell 300 is provided with an installation protrusion 600 extending toward the roller shaft 100, and the roller shaft 100 is provided with a limiting stop 700 that contacts the installation protrusion 600. The limiting stop 700 is used to limit the position of the installation protrusion 600.

[0064] In this embodiment, a mounting protrusion 600 extending toward the roller shaft 100 is installed on the support shell 300, and a limiting stop 700 in contact with the protrusion is installed on the roller shaft 100, providing positioning for the support shell 300 on the roller shaft 100. The cooperation between the mounting protrusion 600 and the limiting stop 700 effectively restricts the axial displacement of the support shell 300 on the roller shaft 100, preventing axial movement of the support shell 300 during operation, and ensuring that the relative position between the support shell 300 and the roller shaft 100 remains stable when the press roller is running at high speed, thereby improving the operating accuracy and stability of the press roller.

[0065] Meanwhile, a limiting stop is used to block the mounting protrusion 600. The mounting protrusion 600 is fixed to the support shell 300 with screws, and the limiting stop 700 is also fixed to the roller 100 with screws. This modular installation method makes the assembly and disassembly of the support shell 300 and the roller 100 more convenient and quick. Similarly, when maintaining the equipment or replacing parts, the support shell 300 can be easily removed from the roller 100 simply by loosening the corresponding screws, shortening the installation and disassembly time of the equipment and improving work efficiency.

[0066] Example 4:

[0067] This application provides a press roller, which, in addition to the above-mentioned technical features, also includes the following technical features.

[0068] like Figures 1 to 4 As shown, the rotating roller sleeve 500 is provided with retaining rings 800 at both ends. The inner wall of the retaining rings 800 contacts the outer wall of the support shell 300 and seals both ends of the first gap 310, so that the first gap 310 forms a closed space.

[0069] In this embodiment, by installing retaining rings 800 at both ends of the rotating roller sleeve 500, the inner wall of which is in close contact with the outer wall of the support shell 300, the two ends of the first gap 310 can be sealed, successfully constructing the first gap 310 into a closed space. This effectively prevents external dust, moisture, fiber debris and other impurities from entering, providing a good storage environment for the lubricating medium present in the first gap 310, preventing lubricating medium leakage, ensuring the normal operation of the bearing 400, and ensuring that the relative movement between the rotating roller sleeve 500 and the support shell 300 can always be in a good lubrication state, reducing wear between components and extending the service life of the equipment.

[0070] The retaining ring 800 is fixed to the rotating roller sleeve 500 by screws and rotates together with the rotating roller sleeve 500, ensuring a firm and reliable connection between the retaining ring 800 and the rotating roller sleeve 500, preventing loosening or detachment during operation. Simultaneously, the synchronous rotation of the retaining ring 800 and the rotating roller sleeve 500 keeps the closed state of the first gap 310 stable and unaffected by relative movement of components, further improving the operational stability of the equipment.

[0071] In addition, a sealing ring 810 is installed between the retaining ring 800 and the mounting protrusion 600. An isolation plate 820 is installed on the outside of the retaining ring 800 by screws. The isolation plate 820 contacts the sealing ring 810. The sealing ring 810 can effectively fill the tiny gap between the retaining ring 800 and the mounting protrusion 600, preventing external impurities from entering the first gap 310 through the gap. Combined with the sealing effect of the retaining ring 800, a double sealing guarantee is formed, which improves the sealing performance of the first gap 310.

[0072] Furthermore, the inner wall of the rotating roller sleeve 500 is provided with an inner ring groove 510 that is adapted to the bearing 400.

[0073] The inner wall of the rotating roller sleeve 500 has an inner ring groove 510 that is adapted to the bearing 400, which can provide an installation positioning reference for the bearing 400. When installing the bearing 400, the bearing 400 can be accurately embedded in the inner ring groove 510, avoiding problems such as eccentricity and tilting of the bearing 400 caused by installation position deviation. This ensures the installation accuracy of the bearing 400 in the rotating roller sleeve 500 and lays the foundation for the smooth operation of the press roller.

[0074] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0075] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A press roll, characterized by: The utility model relates to a kind of rotary roller, including: Roller shaft (100), which is hollow inside; Hydraulic cylinder (200) is arranged inside roller shaft (100); Support shell (300) is arranged outside roller shaft (100) and forms first gap (310) between roller shaft (100); Bearing (400) is arranged in second gap (520); Rotary roller sleeve (500) is arranged outside support shell (300) and forms second gap (520) between support shell (300); Wherein, the output shaft of hydraulic cylinder (200) is fixedly connected with support shell (300) after passing through roller shaft (100).

2. A press roll according to claim 1, characterized in that: The hydraulic cylinder (200) is provided with multiple, multiple hydraulic cylinders (200) are evenly and spacedly arranged inside the roller shaft (100), and each hydraulic cylinder (200) is connected with driving device.

3. A press roll according to claim 1, characterized in that: The roller shaft (100) is provided with multiple through holes (110) for the output shaft of the hydraulic cylinder (200) to pass through, and a linear bearing (120) is arranged in the through hole (110).

4. A press roll according to claim 1, characterized in that: The both ends of the roller shaft (100) are provided with sealing covers (130), and the sealing covers (130) are fixed with the roller shaft (100) by fastening screws.

5. A press roll according to claim 1, characterized in that: The support shell (300) is provided with mounting protrusions (600) extending towards the roller shaft (100), and the roller shaft (100) is provided with limiting stoppers (700) in contact with the mounting protrusions (600), and the limiting stoppers (700) are used to limit the position of the mounting protrusions (600).

6. A press roll according to claim 1, characterized in that: The both ends of the rotary roller sleeve (500) are provided with stop rings (800), the inner wall of the stop ring (800) is in contact with the outer wall of the support shell (300), and the both ends of the first gap (310) are blocked, so that the first gap (310) forms a closed space.

7. A press roll according to claim 1, characterized in that: The inner wall of the rotary roller sleeve (500) is provided with an inner ring groove (510) matched with the bearing (400).

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