Force balancing device for drying cylinder mandrel

Abstract

The invention provides a force balancing device for a drying cylinder mandrel, and relates to the technical field of special equipment pressure containers. The force balancing device for the drying cylinder mandrel comprises a limiting sleeve, a connecting flange and a fixing flange are arranged at the two ends of the limiting sleeve respectively, a two-section type lap joint structure mandrel is arranged on one side of the connecting flange, and stress springs are symmetrically arranged at the two ends of the limiting sleeve. A stress spring pull rod is arranged at the end, away from the limiting sleeve, of the stress spring. By arranging the force balancing device, due to the existence of the stress spring in the force balancing device used by the drying cylinder mandrel, the axial force on the drying cylinder mandrel generated by the internal pressure and the temperature effect is borne by the stress spring, and the stress spring not only can bear the axial force, but also can compensate the mandrel elongation generated by temperature rise; the use safety performance of the drying cylinder mandrel is improved, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of special equipment pressure vessels, in particular to a force balancing device used for a drying cylinder spindle. Background Art

[0002] Drying cylinder is a key equipment used for drying in papermaking, food, printing and dyeing textile, leather, wood processing and other industries, and is a special equipment pressure vessel. With the great progress of my country's papermaking and other industries, the technical level has been further improved. In recent years, with the advancement of science and technology, the production line has been continuously developed in the direction of wide width, high speed, high efficiency, low energy consumption and improved single-machine production capacity, which requires the diameter of the drying cylinder to be continuously increased. Since the drying cylinder is a pressure vessel, as the diameter continues to increase, the force on the end covers on both sides of the drying cylinder becomes greater and greater. At this time, it is necessary to add a pulling mandrel structure in the center of the drying cylinder to share the force.

[0003] The current spindle structure is to divide the spindle into two sections, connected in the middle by a connecting stud. Under this design, the force of the spindle is ultimately borne by the connecting stud. However, due to the particularity of the drying cylinder spindle structure, it is impossible to accurately calculate the tensile force on the spindle by rule design, which results in the connection stud diameter can only be given by experience. If the stud diameter is increased without limit when it cannot be accurately calculated, it will bring great inconvenience to the installation and a substantial increase in manufacturing costs. On the other hand, if the stud diameter is not taken enough, in some cases, it may cause the stud to break, bringing great safety hazards. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies of the prior art, the present invention provides a force balancing device for a drying cylinder spindle, which solves the problems of inconvenient installation of the existing spindle, a significant increase in manufacturing costs, and potential safety hazards caused by stud breakage.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a force balancing device used for a drying cylinder shaft, comprising a limiting sleeve, a connecting flange and a fixing flange are respectively arranged at both ends of the limiting sleeve, a two-section overlapping structure shaft is arranged on one side of the connecting flange, force springs are symmetrically arranged at both ends of the limiting sleeve, and a force spring pull rod is arranged at one end of the force spring away from the limiting sleeve.

[0008] Through the above technical solution, after the drying cylinder is subjected to internal pressure and temperature loads, the axial tension generated on the mandrel is completely borne by the force-bearing spring, and the spring reaches a balanced state after a certain displacement after being subjected to force.

[0009] Preferably, connecting bolts are symmetrically arranged at both ends of the connecting flange and the fixing flange, the connecting bolts vertically penetrate the connecting flange and the fixing flange, and the connecting flange and the fixing flange are threadedly connected by the connecting bolts.

[0010] Preferably, a connecting nut is provided at one end of the connecting bolt, and the connecting nut is threadedly connected to the connecting bolt.

[0011] Preferably, the connecting flange is connected to the two-section lap-jointed structure mandrel by welding, and a plurality of connecting flanges are uniformly welded on the two-section lap-jointed structure mandrel.

[0012] Through the above technical solution, a two-section overlapping structure mandrel is provided to ensure that the axial displacement of the mandrel is within a control range when the mandrel is heated and elongated. At the same time, it is also convenient for the combined installation of the two-section mandrel, thereby improving the installation efficiency of the staff.

[0013] Preferably, a plurality of evenly distributed circular holes are formed on the connecting flange and the fixing flange, and the limiting sleeves pass through the circular holes.

[0014] Through the above technical solution, one end of the limiting sleeve can move freely in the connecting flange and the circular hole channel opened on the connecting flange, and is used for axial movement as the core shaft is heated and elongated, so as to limit the radial displacement of the spring and ensure that the stressed spring only produces axial displacement.

[0015] Preferably, one end of the limiting sleeve is welded to the connecting flange and the fixing flange on one side, and the other end of the limiting sleeve is slidably connected to the circular holes opened on the connecting flange and the fixing flange.

[0016] Preferably, a plurality of force-bearing spring pull rods are uniformly arranged on the circumference of the connecting flange, and the plurality of force-bearing spring pull rods are welded to the connecting flange.

[0017] Preferably, one end of a plurality of the force springs vertically penetrates the limiting sleeve, and one end of the force spring away from the limiting sleeve is fixedly connected to the force spring pull rod.

[0018] Through the above technical solution, the force spring can not only withstand the axial force, but also compensate for the elongation of the spindle caused by the temperature increase, so that the safety performance of the drying cylinder spindle is improved and the manufacturing cost is reduced.

[0019] Working principle: The connecting flange 1 is connected to the two-section lap-jointed structure spindle by welding. A connecting flange 1 is welded to each section of the two-section spindle. The connecting flange 2 is connected to the connecting flange 1 by connecting bolts 3. Evenly distributed circular holes are opened on the connecting flange 1 and the connecting flange 2 for passing through and placing the limiting sleeve 6. One end of the limiting sleeve 6 is welded to the connecting flange 1 and the connecting flange 2 on one side, and the other end can move freely in the circular hole channel opened on the connecting flange 1 and the connecting flange 2, and is used for axial movement when the spindle is heated and elongated.

[0020] The force-bearing spring pull rod 5 is welded in the diameter direction of each uniformly distributed circular hole of the connecting flange 1. The outer sides of the two connecting flanges 1 each need to be welded with a corresponding force-bearing spring pull rod 5 according to the number of uniformly distributed circular holes. Each end of the force-bearing spring 4 is hung on the force-bearing spring pull rod 5 and passes through a limit sleeve 6. The limit sleeve can limit the radial displacement of the spring to ensure that the force-bearing spring only displaces in the axial direction.

[0021] The two-section overlap structure mandrel 7 is designed to ensure that the axial displacement of the mandrel is within a controllable range when the mandrel is heated and elongated, and also facilitates the combined installation of the two-section mandrel.

[0022] After the drying cylinder is subjected to internal pressure and temperature loads, the axial tension generated on the spindle is all borne by the force-bearing spring. After the spring is subjected to force, it deforms to a certain displacement and reaches a balanced state.

[0023] (III) Beneficial effects

[0024] The present invention provides a force balancing device used for a drying cylinder spindle. It has the following beneficial effects:

[0025] 1. The present invention sets a two-section overlapping structure spindle to ensure that the axial displacement of the spindle is within a control range when the spindle is heated and elongated, and also facilitates the combined installation of the two-section spindle, thereby improving the installation efficiency of the staff; the limiting sleeve can limit the radial displacement of the spring, ensuring that the stressed spring only produces axial displacement.

[0026] 2. The present invention provides a force balancing device. Due to the presence of a force spring in the force balancing device used for the drying cylinder spindle, the axial force on the drying cylinder spindle generated by the internal pressure and temperature effect is borne by the force spring. The force spring can not only withstand the axial force but also compensate for the elongation of the spindle caused by the increase in temperature, thereby improving the safety performance of the drying cylinder spindle and reducing the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional view of the present invention;

[0028] Figure 2 It is a side view of the present invention;

[0029] Figure 3 It is an enlarged view of point A of the present invention.

[0030] Among them, 1. connecting flange; 2. fixing flange; 3. connecting bolts; 31. connecting nuts; 4. force spring; 5. force spring pull rod; 6. limiting sleeve; 7. two-section lap structure core shaft. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0032] Embodiment 1:

[0033] like Figure 1 , Figure 2 and Figure 3 It is shown that an embodiment of the present invention provides a force balancing device for a drying cylinder shaft, comprising a limiting sleeve 6, wherein a connecting flange 1 and a fixing flange 2 are respectively arranged at both ends of the limiting sleeve 6, a two-section overlapping structure shaft 7 is arranged on one side of the connecting flange 1, force springs 4 are symmetrically arranged at both ends of the limiting sleeve 6, and a force spring pull rod 5 is arranged at one end of the force spring 4 away from the limiting sleeve 6.

[0034] Connecting bolts 3 are symmetrically arranged at both ends of the connecting flange 1 and the fixing flange 2 . The connecting bolts 3 vertically penetrate the connecting flange 1 and the fixing flange 2 . The connecting flange 1 and the fixing flange 2 are threadedly connected by the connecting bolts 3 .

[0035] A connecting nut 31 is disposed at one end of the connecting bolt 3 , and the connecting nut 31 is threadedly connected to the connecting bolt 3 .

[0036] The connecting flange 1 is connected to the two-section overlapping structure mandrel 7 by welding, and a plurality of connecting flanges 1 are uniformly welded on the two-section overlapping structure mandrel 7 .

[0037] The connecting flange 1 and the fixing flange 2 are provided with a plurality of evenly distributed circular holes, and the limiting sleeve 6 passes through the circular holes.

[0038] One end of the limiting sleeve 6 is welded to the connecting flange 1 and the fixing flange 2 on one side, and the other end of the limiting sleeve 6 is slidably connected to the circular holes opened on the connecting flange 1 and the fixing flange 2 .

[0039] A plurality of force-bearing spring pull rods 5 are uniformly arranged on the circumference of the connecting flange 1 , and the plurality of force-bearing spring pull rods 5 are welded to the connecting flange 1 .

[0040] One end of a plurality of the force springs 4 vertically penetrates the limiting sleeve 6 , and one end of the force spring 4 away from the limiting sleeve 6 is fixedly connected to the force spring pull rod 5 .

[0041] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A force balancing device for a drying cylinder spindle, comprising a limiting sleeve (6), characterized in that: The two ends of the limiting sleeve (6) are respectively provided with a connecting flange (1) and a fixing flange (2); a two-stage overlapping structure spindle (7) is provided on one side of the connecting flange (1); force springs (4) are symmetrically provided at the two ends of the limiting sleeve (6); and a force spring pull rod (5) is provided at one end of the force spring (4) away from the limiting sleeve (6).

2. A force balancing device for a drying cylinder spindle according to claim 1, characterized in that: Connecting bolts (3) are symmetrically arranged at both ends of the connecting flange (1) and the fixing flange (2); the connecting bolts (3) vertically penetrate the connecting flange (1) and the fixing flange (2); and the connecting flange (1) and the fixing flange (2) are threadedly connected via the connecting bolts (3).

3. A force balancing device for a drying cylinder spindle according to claim 2, characterized in that: A connecting nut (31) is provided at one end of the connecting bolt (3), and the connecting nut (31) is threadedly connected to the connecting bolt (3).

4. A force balancing device for a drying cylinder spindle according to claim 1, characterized in that: The connecting flange (1) is connected to the two-section overlapping structure core shaft (7) by welding, and a plurality of connecting flanges (1) are uniformly welded on the two-section overlapping structure core shaft (7).

5. A force balancing device for a drying cylinder spindle according to claim 1, characterized in that: The connecting flange (1) and the fixing flange (2) are provided with a plurality of evenly distributed circular holes, and the limiting sleeves (6) pass through the circular holes.

6. A force balancing device for a drying cylinder spindle according to claim 1, characterized in that: One end of the limiting sleeve (6) is welded to the connecting flange (1) and the fixing flange (2) on one side, and the other end of the limiting sleeve (6) is slidably connected to the circular holes opened on the connecting flange (1) and the fixing flange (2).

7. A force balancing device for a drying cylinder spindle according to claim 1, characterized in that: A plurality of force-bearing spring pull rods (5) are evenly arranged on the circumference of the connecting flange (1), and the plurality of force-bearing spring pull rods (5) are welded to the connecting flange (1).

8. A force balancing device for a drying cylinder spindle according to claim 1, characterized in that: One end of a plurality of the force-bearing springs (4) vertically penetrates the limiting sleeve (6), and one end of the force-bearing spring (4) away from the limiting sleeve (6) is fixedly connected to the force-bearing spring pull rod (5).

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