KR830000005B1 - Forced lubricated bearing structure - Google Patents

Abstract

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Description

Forced lubricated bearing structure

1 is a cross-sectional view of a doctor bearing structure of the present invention.

2 is a cross-sectional view taken along the line II-II of FIG.

3 is a perspective view of a bearing bushing according to an embodiment of the present invention.

4 is a perspective view of a bearing bushing according to another embodiment of the present invention.

5 is a partially enlarged cross-sectional view showing the positional relationship of each bearing part as the journal moves to the right.

6 is a partially enlarged cross-sectional view showing the positional relationship of each bearing part as the journal moves to the left.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvements in paper machines, and more particularly to forced lubricated bearing structures used in doctor bearings for doctor blades in paper machines.

In the paper machine, the doctor blade is installed in several positions to doctor the rolls and is supported by the blade holder. The blade holder is also supported by a doctor back, which requires an end bearing and oscillates axially to prevent grooves in the roll. In widely used paper machines, the doctor assembly not only has significant weight but also moves continuously, requiring means for lubricating end bearings. In addition, the bearing is manufactured in an annular shape because the doctor assembly needs to be adjusted to be inclined away from the roll for maintenance and to be moved toward the roll for operation and adjustment. In addition, bearings must not only continue to operate at high temperatures and humidity, but also suffer from large impact loads, which leads to significant lubrication problems. In view of this, various attempts have been made, and accordingly, various types of bearings have been provided, but only with a slight success, the disadvantages and problems of lubrication existing in the existing bearings have remained. For example, there is a problem inherent in the use of a sleeve bearing or a ball bushing bearing. That is, the conventional lubrication method does not allow uniform lubrication other than the balls located at the end of the bearing. The axial oscillation that occurs during one revolution results in local hardening or brinelling of the races, which in turn impedes the rotation and improper rotation of the doctor relative to the roll. In addition, conventional bearings are expensive, complex lubrication equipment, difficult to repair and may be damaged during operation, without lubricating the web or parts contacting the conveyed paper web or their contact surfaces to contaminate the web. There was a problem that the lubrication must be made sure.

It is therefore an object of the present invention to provide a forced lubricated bearing structure which is used for vibration doctor bearings of paper machines to reliably provide lubrication.

Another object of the present invention is to provide an improved bearing structure configured to automatically supply lubrication by continuously supplying lubricating oil under pressure when the journal and bearing are constantly vibrating.

Another object of the present invention is to provide a relatively uncomplicated, inexpensive and continuous operation to improve the lubrication between surfaces by allowing the lubricant to be continuously pumped to the bearing surface by using the relative movement between the journal and the bearing. It is to provide a bearing structure that can be structured.

Hereinafter, with reference to the accompanying drawings will be described in more detail with respect to the present invention.

As shown in FIG. 1, the doctor back journal 10 includes a doctor bag 11 shown schematically, and a journal 12 is installed at the end of the doctor shaft. On both years of the doctor bag 11, bearing assemblies 8 are provided, respectively, and a symbol 9 denotes a journal portion located at the other end of the bag. As the drive mechanism 11a for the bearing assembly, a structure such as an extension of the shaft is provided, which acts to vibrate the bag to rotate it to the required rotatable position. In operation, the vibrations are continuously made, for example, with a required frequency of 16 per minute and a length of about 6.35 to 19.05 mm.

The doctor journal 12 is supported in an annular bearing housing 13 of multiple parts, as shown in the figure, which bearing housing 13 may be manufactured in various structures to suitably provide bearing support. .

As shown in Figs. 1 and 2, the bearing housing is provided with a cap 13a, which is formed by an annularly arranged cap screw 13f that is spirally coupled to the annular main body of the bearing housing. It will be firmly held in place. The bearing housing 13 is supported by a bearing support ring 14, which is supported by the frame portion 15 and at least two as shown in FIG. 2 to facilitate assembly. It is divided into parts. Sealing sleeves 13b and 13c are provided in the bearing housing 13, and the inner surfaces of the sealing sleeves 13b and 13c are smoothly formed. It interacts with the outer sealing members 16 and 17 which slide in the axial direction on the journal. Sealing member 16 is a ring having an annular groove is inserted into the elastic member, such as the 0-type ring (16a) in the groove. The sealing member 17 provided at the end of the journal is supported on the plate 12b coupled to the journal end by a cap screw 12c. The sealing member 17 is also formed with an annular groove for receiving the zero ring 17a. Since the sealing members 16 and 17 are axially outermost parts of the actuating mechanism, they will be referred to as first and second outer sealing members hereinafter.

The bearing housing 13 has a bearing surface for supporting the journal 12 located therein, which bearing surface is shown to be provided by an annular bushing 22 in which a groove 23 is formed. The bushing 22 can be formed in various forms, two of which are shown in FIGS. 3 and 4. The bushing 22 is fixedly mounted in the bearing housing and has a smooth inner surface to support the annular journal collar 12a mounted to the journal and having a smooth outer surface. The journal collar 12a, which can be said to be a part of the journal, is movable along the outer sealing members 16 and 17 in the axial direction.

The bearing housing 13 is also provided with two inner sealing members 18, 19 in the form of a lip. The inner sealing member acts to allow the lubricant to flow only axially outward from the bearing bushing 22 and not in the reverse direction. The bearing bushing 22 also has an inner ring bearing surface 45.

As shown in FIG. 3, grooves 23a and 23 extending in the axial direction are formed on the inner and outer surfaces of the bearing bushing 22, respectively. Each groove is provided with a radially perforated hole 24. The lubricant can flow from the outside of the bearing to the inside, and the inner groove 23a allows the lubricant to flow in both directions.

The present invention may also be practiced by providing a bearing surface of some form that allows for a flow of lubricant between the moving surfaces in contact with each other, but a bushing or bearing surface with a groove that allows the lubricant to flow axially outwardly. It is provided to provide an advantage when practicing the present invention. This will be explained in detail later.

4 shows another type of bearing in which a groove is formed in a herringbone shape on the inner bearing surface of the bushing. The outer and inner surfaces of the bushing 26 are formed with annular grooves 27 and 30, respectively, and a plurality of holes 28 are radially inward from the outer annular groove 27 to the inner annular groove 30. Extends to. The inner annular groove 30 is in communication with the grooves 29 extending axially outward on the inner surface of the bushing.

The outer sealing members 16 and 17 form the lubricating oil pressure chambers 20 and 21 between the inner sealing members 18 and 19, respectively. As the outer sealing members 16 and 17 reciprocate together with the journal, the sizes of the pressure chambers 20 and 21 are alternately increased and decreased to pressurize the lubricating oil in the pressure chamber to provide the bearing surface. Pump. In this embodiment, the radially perforated holes 24 and 25 are communicated with the pressure chamber so that the lubricant can be supplied to the pressure chamber. However, during operation, the through holes 24 and 25 are plugged 24a. ) And (25a) so that pressure can be generated in the pressure chambers 20, 21.

Lubricant oil is transferred from the pressure chambers 20 and 21 to the bearing surface via the first and second lubricating oil passages 31 and 32. The lubricating oil passages 31, 32 are in communication with the pressure chambers 20, 21 via radial holes 33, 35, as shown in FIG. 1. Each lubricating oil passage 31, 32 leads to a bearing face 45, which in this embodiment leads to a bearing face 45 through a single inlet 34. The inlet 34 communicates with the annular groove of the bearing bushing so that the lubricating oil conveyed under pressure is pressurized directly to the bearing surface 45, so that the journal can be lubricated as it slides back and forth in the axial direction. .

Each of the lubricating oil passages 31 and 32 is provided with check valves 36 and 37 for preventing backflow, so that the size of the pressure chamber gradually decreases, and when the lubricating oil is pressurized into the lubricating oil passage through the check valve, The lubricant passage prevents the lubricant from entering other pressure chambers of increasing size. This will be described in detail with reference to FIGS. 5 and 6.

5 shows the operating relationship of the components as the journal moves to the right as shown by the arrow 46. When the journal moves to the right side, the outer sealing member 16 moves to the right side, and the size of the pressure chamber 20 gradually decreases. Since the inner sealing member 18 is installed, when the size of the pressure chamber 20 is reduced, the lubricant does not pass through the inner sealing member 18, but instead passes through the hole 33 and opens therefrom. 36 through the passageway (31). In this case, the check valve 37 remains closed, so that the lubricating oil passes through the lubricating oil passage 31, the inlet 34 via the check valve 36, as indicated by arrows 38, 39, and the bearing surface. Will be transferred to.

The pressure chamber 21 is suctioned by increasing its size, that is, by allowing it to move in the direction opposite to the journal movement direction, thereby promoting the movement of the lubricant through the lubricant passageway 31. Thus, the double pumping of the lubricating oil in that the reduction in the size of the pressure chamber 20 causes the lubricant to be forced out of the pressure chamber 20 and the lubricating oil is sucked into the pressure chamber 21 due to the increase in the size of the pressure chamber 21. This is done.

FIG. 6 shows the operating relationship of each part when the journal is moved to the left as indicated by arrow 47. In this case, the pressure chamber 21 on the right side gradually decreases in size so that the lubricating oil therein passes through the check valve 3 7 through the hole 35 as indicated by the arrow 41, and above the arrow ( Passed through passage 32 as indicated by 42). By closing the left check valve 36, the lubricating oil is forced to the upper side into the bearing bushing. The inner sealing member 18 located on the left side allows the lubricant to move to the left into the pressure chamber 20 which increases in size as indicated by arrow 43.

As such, the forced lubricated bearing structure of the present invention makes it possible to achieve the objects and advantages as described above. Sealing members, check valves and other components described in the text may be modified and provided in addition to the type described above.

Claims (1)

In a forced lubricated bearing structure used for doctor bearings of paper machines, a doctor shaft having an axially vibrating journal 12 and a journal shaft 12 are installed to surround the journal 12 and slide with the journal 12. An annular bearing housing 13 having a bearing surface providing means 22 which contacts and supports it and forms first and second annular spaces between the journal at the end of the bearing surface providing means 22 and the annular shape; Inside of each of the first and second outer annular sealing members 16 and 17 and the respective outer sealing members 16 and 17 mounted on the axial outer end of the space so as to axially move together with the journal 12. Are spaced apart from each other so as to form lubricating oil pressure chambers 20 and 21 between the outer sealing members 16 and 17, respectively, so that the lubricating oil flows only in the axial direction and does not flow in the axial direction. Lip shaped first and second inner annular sealing members 18 and 19 and bearings The first and second lubricating oil passages 31 and 32 formed in the housing 13 and communicating between the respective lubricating oil pressure chambers 20 and 21 and the bearing surface, and the lubricating oil passages 31 and 32, respectively. Forced lubricated bearing structure, characterized in that the check valve (36), (37) is installed to act to flow the lubricating oil from the pressure chamber only to the bearing surface and prevent its reverse flow.

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