Replaceable sealed steel Yankee dryer

Abstract

The invention provides a replaceable sealed steel Yankee cylinder, which comprises an equal-diameter cylinder body, an equal-diameter mandrel, a double-row bolt hole flange, a sealing gasket and a fastening bolt, the equal-diameter cylinder body and the mandrel adopt an equal-diameter spigot design, and are matched with an inner wall ring groove to realize accurate positioning and efficient heat conduction; the double-row bolt hole flange and the sealing gasket are combined to form a double-sealing structure, the fastening bolt ensures sealing reliability and effectively eradicates steam leakage, the independent flange design enables quick-wear parts such as the sealing gasket and the like to be quickly replaced, the assembling precision of the cylinder body and the mandrel is not affected in the disassembling and assembling process, and the shutdown maintenance time is greatly shortened. By means of the structure, the Yankee dryer can enhance the tolerance to loads under complex working conditions, prolong the service life of equipment and reduce the cost of energy, manpower and raw materials, has economic and environment-friendly benefits, and meets the efficient and stable production requirements of the modern papermaking industry.

Description

Technical Field

[0001] The invention relates to the technical field of paper manufacturing, in particular to a replaceable sealed steel Yankee cylinder. Background Art

[0002] Steel Yankee dryers are core components in the household paper industry, subject to complex operating loads such as internal steam pressure, external linear pressure, centrifugal force, and temperature field stress. Designed for a long service life, they are subject to factors such as irregular shutdowns, machining accuracy, and gasket aging. Steam leakage accidents are unavoidable during actual operation. Currently, the steel Yankee dryer structures on the market cannot completely solve the leakage problem, seriously affecting production safety and operational efficiency. Since their introduction, steel Yankee dryers have been divided into two categories: one-piece mandrel structure and split mandrel structure. The one-piece mandrel structure is further divided into two types: pull-type and penetration type.

[0003] Regardless of the above forms, if steam leakage occurs during production operation, the sealing gasket cannot be replaced on site, because the central shaft and the shaft head and the cylinder assembly positioning stop are interference or transition fit, and there is no possibility of disassembly on site. It can only be temporarily handled by plugging with glue, etc. After a period of time, leakage will occur again. If this happens repeatedly, reliable operation cannot be guaranteed. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a replaceable sealed steel Yankee cylinder, which solves the leakage problem. It only requires removing the bolts, flanges, and gaskets and replacing them with new ones. This greatly extends the service life of the drying cylinder, ensures continuous and safe operation, and improves production efficiency.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a replaceable sealed steel Yankee cylinder, comprising: a constant diameter cylinder body, a first end cap fixedly connected to the left end of the constant diameter cylinder body, a second end cap fixedly connected to the right end of the constant diameter cylinder body, a first shaft head and a second shaft head respectively placed in the central through holes of the first end cap and the second end cap, a constant diameter mandrel disposed between the first shaft head and the second shaft head, a first double-row bolt hole flange fixedly connected to the left end of the first shaft head via a second fastening bolt, and a second double-row bolt hole flange fixedly connected to the right end of the second shaft head via a third fastening bolt; A first sealing gasket is provided between the first double-row bolt hole flange and the first shaft head and the first end cover, and a second sealing gasket is provided between the second double-row bolt hole flange and the second shaft head and the second end cover.

[0006] Preferably, a steam hole is provided on the outer side of the equal-diameter mandrel.

[0007] Preferably, a steam inlet hole is provided inside the first shaft head, and the right end of the steam inlet hole is communicated with the interior of the equal-diameter core shaft.

[0008] Preferably, a condensate discharge hole is provided inside the second shaft head, and the left end of the condensate discharge hole is communicated with the interior of the equal-diameter core shaft.

[0009] Preferably, a first inspection opening is provided inside the first end cover near the upper end, and a front end of the first inspection opening is fixedly connected to the first inspection cover via a first fixing bolt.

[0010] Preferably, a second inspection opening is provided inside the second end cover near the lower end, and a front end of the second inspection opening is fixedly connected to the second inspection cover via a second fixing bolt.

[0011] Preferably, the inner wall of the equal-diameter cylinder is provided with annular grooves, and the number of the annular grooves is multiple and horizontally equidistantly distributed.

[0012] Preferably: a first fastening bolt is provided at the left end of the first double-row bolt hole flange, the right end of the first fastening bolt passes through the first double-row bolt hole flange and is connected to the internal thread of the first end cover, and a fourth fastening bolt is provided at the right end of the second double-row bolt hole flange, the left end of the fourth fastening bolt passes through the second double-row bolt hole flange and is connected to the internal thread of the second end cover.

[0013] The present invention provides a replaceable sealed steel Yankee cylinder, which has the following beneficial effects: This replaceable sealed steel Yankee cylinder uses a combination of double-row bolt hole flanges, sealing gaskets and fastening bolts to form a double-sealed structure, effectively preventing steam leakage and avoiding heat loss and safety risks caused by leakage. The independent flange design allows for quick replacement of wearing parts such as sealing gaskets without disassembling the cylinder body and mandrel, significantly shortening downtime, reducing maintenance costs and extending equipment life. The equal-diameter stop design of the equal-diameter cylinder body and mandrel, combined with the inner wall ring groove, ensures symmetrical force and precise positioning, enhancing the equipment's tolerance to complex working loads, while improving heat conduction efficiency and ensuring paper drying quality. In addition, reduced steam leakage, convenient maintenance and stable operation reduce energy, labor and raw material costs, achieving both economic and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the first shaft head installation structure of the present invention; Figure 4 This is a schematic diagram of the second shaft head installation structure of the present invention; Figure 5 It is a left side view of the present invention; Figure 6 It is a right side view of the present invention.

[0015] Among them, 1. equal-diameter cylinder body; 2. first end cover; 3. second end cover; 4. first shaft head; 5. second shaft head; 6. ring groove; 7. first inspection port; 8. first inspection cover; 9. second inspection port; 10. second inspection cover; 11. equal-diameter spindle; 12. first double-row bolt hole flange; 13. second double-row bolt hole flange; 14. first sealing gasket; 15. first fastening bolt; 16. second fastening bolt; 17. first fixing bolt; 18. second sealing gasket; 19. second fixing bolt; 20. third fastening bolt; 21. fourth fastening bolt; 22. steam through hole; 23. steam inlet hole; 24. condensate discharge hole. DETAILED DESCRIPTION

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] like Figure 1-6 As shown, an embodiment of the present invention provides a replaceable sealed steel Yankee cylinder, comprising a constant diameter cylinder body 1, a first end cover 2 being fixedly connected to the left end of the constant diameter cylinder body 1, a second end cover 3 being fixedly connected to the right end of the constant diameter cylinder body 1, a first shaft head 4 and a second shaft head 5 being respectively placed in the central through holes of the first end cover 2 and the second end cover 3, a constant diameter mandrel 11 being provided between the first shaft head 4 and the second shaft head 5, a steam through hole 22 being provided on the outer side of the constant diameter mandrel 11, a first double-row bolt hole flange 12 being fixedly connected to the left end of the first shaft head 4 by a second fastening bolt 16, and a second double-row bolt hole flange 13 being fixedly connected to the right end of the second shaft head 5 by a third fastening bolt 20.

[0018] A steam inlet hole 23 is provided inside the first shaft head 4, and the right end of the steam inlet hole 23 is connected to the interior of the equal-diameter core shaft 11. External steam is input through the steam inlet hole 23 inside the first shaft head 4. A condensate discharge hole 24 is provided inside the second shaft head 5, and the left end of the condensate discharge hole 24 is connected to the interior of the equal-diameter core shaft 11. After releasing heat, the steam condenses into water. Under the combined action of gravity and steam pressure, the condensed water converges along the inner wall of the equal-diameter core shaft 11 to the second shaft head 5, and is discharged out of the cylinder through the condensate discharge hole 24 inside the second shaft head 5.

[0019] A first inspection port 7 is provided inside the first end cover 2 near the upper end, and a first inspection cover 8 is fixedly connected to the front end of the first inspection port 7 by a first fixing bolt 17. A second inspection port 9 is provided inside the second end cover 3 near the lower end, and a second inspection cover 10 is fixedly connected to the front end of the second inspection port 9 by a second fixing bolt 19, so that the staff can open the inspection cover to check the internal components or clean the dirt when the equipment is shut down, thereby ensuring the stable operation of the equipment.

[0020] The inner wall of the equal-diameter cylinder body 1 is provided with an annular groove 6. The number of the annular grooves 6 is multiple and they are horizontally equidistantly distributed, which increases the contact area between the steam and the cylinder wall and promotes the rapid conduction of heat to the outer surface of the cylinder body, thereby efficiently heating and dehydrating the paper close to the cylinder body. A first fastening bolt 15 is provided at the left end of the first double-row bolt hole flange 12, and the right end of the first fastening bolt 15 passes through the first double-row bolt hole flange 12 and is connected to the internal thread of the first end cover 2. A fourth fastening bolt 21 is provided at the right end of the second double-row bolt hole flange 13, and the left end of the fourth fastening bolt 21 passes through the second double-row bolt hole flange 13 and is connected to the internal thread of the second end cover 3. A first sealing gasket 14 is provided between the first double-row bolt hole flange 12 and the first shaft head 4 and the first end cover 2, and a second sealing gasket 18 is provided between the second double-row bolt hole flange 13 and the second shaft head 5 and the second end cover 3. The flange is firmly connected to the spindle and the cylinder body by fastening bolts to form a sealing structure, which can both transmit torque and prevent steam leakage.

[0021] Working principle: In papermaking, the replaceable sealed steel Yankee cylinder mainly uses steam heating to dry paper. During operation, external steam is input through the steam inlet hole 23 inside the first shaft head 4, and evenly diffuses into the interior of the equal-diameter cylinder body 1 along the steam through hole 22 outside the equal-diameter core shaft 11. The annular groove 6 on the inner wall of the equal-diameter cylinder body 1 increases the contact area between the steam and the cylinder wall, prompting heat to be quickly transferred to the outer surface of the cylinder body, thereby efficiently heating and dehydrating the paper close to the cylinder body. After releasing heat, the steam condenses into water. Under the combined action of gravity and steam pressure, the condensed water gathers along the inner wall of the equal-diameter core shaft 11 to the second shaft head 5, and is discharged out of the cylinder through the condensed water discharge hole 24 inside the second shaft head 5, completing the condensed water recovery. In terms of sealing and maintenance, the equal-diameter cylinder body 1 and the equal-diameter mandrel 11 adopt an equal-diameter design. The integrated flange on the outer side of the mandrel is fixedly connected to the first shaft head 4 and the second shaft head 5 respectively. After the mandrel is installed in place, the first sealing gasket 14 and the second sealing gasket 18 are placed at both ends respectively, and the first double-row bolt hole flange 12 and the second double-row bolt hole flange 13 are installed. The flanges are firmly connected to the mandrel and the cylinder body by tightening the bolts to form a sealing structure, which can not only transmit torque but also prevent steam leakage.

[0022] When a steam leakage problem occurs during operation, it is only necessary to remove the bolts, remove the flange and gasket, and replace the new gasket to complete the repair. There is no need to disassemble the cylinder body and the spindle, which greatly improves the maintenance efficiency. In addition, the inspection ports provided on the first end cover 2 and the second end cover 3 make it convenient for the staff to open the inspection cover when the machine is shut down, check the internal components or clean the dirt, so as to ensure the stable operation of the equipment.

[0023] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A replaceable sealed steel Yankee cylinder, characterized in that: include: A constant diameter cylinder body (1), wherein the left end of the constant diameter cylinder body (1) is fixedly connected to a first end cover (2), and the right end of the constant diameter cylinder body (1) is fixedly connected to a second end cover (3); a first shaft head (4) and a second shaft head (5) are respectively placed in the central through holes of the first end cover (2) and the second end cover (3); a constant diameter spindle (11) is provided between the first shaft head (4) and the second shaft head (5); the left end of the first shaft head (4) is fixedly connected to a first double-row bolt hole flange (12) via a second fastening bolt (16); and the right end of the second shaft head (5) is fixedly connected to a second double-row bolt hole flange (13) via a third fastening bolt (20); A first sealing gasket (14) is provided between the first double-row bolt hole flange (12), the first shaft head (4), and the first end cover (2), and a second sealing gasket (18) is provided between the second double-row bolt hole flange (13), the second shaft head (5), and the second end cover (3).

2. The replaceable sealed steel Yankee cylinder according to claim 1, characterized in that: A steam hole (22) is provided on the outer side of the equal-diameter core shaft (11).

3. The replaceable sealed steel Yankee cylinder according to claim 1, characterized in that: A steam inlet hole (23) is provided inside the first shaft head (4), and the right end of the steam inlet hole (23) is communicated with the interior of the equal-diameter core shaft (11).

4. The replaceable sealed steel Yankee cylinder according to claim 1, characterized in that: A condensate discharge hole (24) is provided inside the second shaft head (5), and the left end of the condensate discharge hole (24) is communicated with the interior of the equal-diameter core shaft (11).

5. The replaceable sealed steel Yankee cylinder according to claim 1, characterized in that: A first inspection opening (7) is provided inside the first end cover (2) near the upper end, and the front end of the first inspection opening (7) is fixedly connected to the first inspection cover (8) via a first fixing bolt (17).

6. The replaceable sealed steel Yankee cylinder according to claim 1, characterized in that: A second inspection opening (9) is provided inside the second end cover (3) near the lower end, and the front end of the second inspection opening (9) is fixedly connected to the second inspection cover (10) via a second fixing bolt (19).

7. The replaceable sealed steel Yankee cylinder according to claim 1, characterized in that: The inner wall of the equal-diameter cylinder (1) is provided with an annular groove (6), and the annular grooves (6) are multiple and horizontally equidistantly distributed.

8. The replaceable sealed steel Yankee cylinder according to claim 1, characterized in that: A first fastening bolt (15) is provided at the left end of the first double-row bolt hole flange (12), and a right end of the first fastening bolt (15) passes through the first double-row bolt hole flange (12) and is connected to the internal thread of the first end cover (2). A fourth fastening bolt (21) is provided at the right end of the second double-row bolt hole flange (13), and a left end of the fourth fastening bolt (21) passes through the second double-row bolt hole flange (13) and is connected to the internal thread of the second end cover (3).

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