Main shaft assembly of drum filter

Abstract

This invention relates to a spindle assembly for a drum-shaped filter screen, comprising: a spindle, a first bearing, a first bearing housing, a second bearing, a second bearing housing, a first brush shaft, a first brush holder, a second brush shaft, and a second brush holder. The first brush holder is sealed to the side of the first bearing housing opposite to the second bearing housing. One end of the first brush shaft is connected to the fixed end of the spindle, and the first brush shaft is located inside the first brush holder. A first current collector flange is provided on the outer wall of the first brush holder. The second brush holder is sealed to the side of the second bearing housing opposite to the first bearing housing. One end of the second brush shaft is connected to the floating end of the spindle, and the second brush shaft is located inside the second brush holder. A second current collector flange electrically connected to the second brush shaft is provided on the outer wall of the second brush holder. The cathodic protection system and the potential measuring device can be independently electrically connected to the spindle via the first brush shaft and the second brush shaft, respectively, thus the potential measuring circuit is not affected by the cathode busbar circuit.

Description

Technical Field

[0001] This invention relates to the technical field of spindle assembly for drum filters in nuclear power plant cold source systems, and particularly to spindle assembly for drum filters. Background Technology

[0002] As the main filtration equipment in the circulating cooling water filtration system of nuclear power plants, drum filters are used to filter impurities, silt, and larger marine organisms in seawater. Their performance directly determines the safety of the cold source and the safe and stable operation of the unit in nuclear power plants.

[0003] The drum filter is a steel structure device, and its working environment is seawater, where steel structures are highly susceptible to corrosion. To prevent corrosion of the drum filter in seawater, a cathodic protection system is needed to apply an external current to it. The current enters the drum filter through its main shaft, and finally, current flows between all components, thus providing cathodic protection and inhibiting corrosion. To achieve optimal protection, the potential of the drum filter needs to be controlled within a certain protection range during operation. Exceeding this range results in under-protection or over-protection; therefore, a potential measuring device is required to monitor the potential of the drum filter in real time to ensure it remains within the protection range.

[0004] The main shaft assembly of a drum filter includes components such as a main shaft, bearing housings, bearings, a brush chamber, a brush shaft, and sealing rings. Both ends of the main shaft are mounted on corresponding bearing housings via bearings. Considering the thermal expansion and contraction of the main shaft, one end is fixed, and the other is floating. In existing technology, a brush shaft is connected to the fixed end of the main shaft. The cathodic protection system and potential measurement device of the drum filter are both electrically connected to the main shaft through this brush shaft, thus enabling cathodic protection and potential measurement through electrical connection between the main shaft and the drum filter. However, because both the cathodic protection system and the potential measurement device are electrically connected to the main shaft via the same brush shaft—meaning they share the same circuit—the potential measurement is easily affected by the cathode current, leading to inaccurate measurements. This results in the potential of the drum filter being outside the protection range, causing the drum filter to be in an underprotected or overprotected state undetected by maintenance personnel, and resulting in corrosion of components. Summary of the Invention

[0005] It is necessary to provide a main shaft device for drum filters to address the problem that the potential measurement is inaccurate in the prior art because the cathodic protection system and potential measurement device of the drum filter are both electrically connected to the main shaft through the same brush shaft.

[0006] A main shaft assembly for a drum-shaped filter screen includes: a main shaft, a first bearing, a first bearing housing, a second bearing, a second bearing housing, a first brush shaft, a first brush box, a second brush shaft, and a second brush box; the fixed end of the main shaft is mounted on the first bearing housing via the first bearing, and the floating end of the main shaft is mounted on the second bearing housing via the second bearing.

[0007] The first brush box is sealed to the side of the first bearing housing opposite to the second bearing housing. One end of the first brush shaft is connected to the fixed end of the main shaft. The first brush shaft is located inside the first brush box. A first collector flange is provided on the outer wall of the first brush box. The first collector flange is electrically connected to the first brush shaft and is used for electrical connection with the cathodic protection system of the drum filter.

[0008] The second brush box is sealed to the side of the second bearing housing opposite to the first bearing housing. One end of the second brush shaft is connected to the floating end of the main shaft. The second brush shaft is located inside the second brush box. A second current collector flange is provided on the outer wall of the second brush box. The second current collector flange is electrically connected to the second brush shaft and is used to electrically connect to the potential measuring device of the drum filter.

[0009] In one embodiment, the spindle includes a first section, a second section, and a shaft body with sequentially increasing outer diameters. The two ends of the second section are connected to the first section and the shaft body, respectively. The first bearing is connected to the first section. A first bushing is fitted onto the second section. A first semi-cylindrical hole is provided at the shoulder formed at the connection between the second section and the shaft body. A second semi-cylindrical hole is provided at one end of the first bushing facing the shaft body. The first semi-cylindrical hole and the second semi-cylindrical hole form a first cylindrical hole. A first saddle pin is provided in the first cylindrical hole.

[0010] In one embodiment, the spindle includes a third segment, a fourth segment with successively increasing outer diameters, and a shaft body. The two ends of the fourth segment are connected to the third segment and the shaft body, respectively. A second bearing is connected to the third segment. A second bushing is fitted onto the fourth segment. A third semi-cylindrical hole is provided at the shoulder formed at the connection between the fourth segment and the shaft body. A fourth semi-cylindrical hole is provided at one end of the second bushing facing the shaft body. The third semi-cylindrical hole and the fourth semi-cylindrical hole form a second cylindrical hole. A second saddle pin is provided in the second cylindrical hole.

[0011] In one embodiment, the main shaft device of the drum-shaped filter screen further includes a first disassembly stud, and one end of the first bearing seat is provided with a first disassembly through hole, which is threadedly engaged with the first disassembly stud; the first disassembly stud is located on the side of the first bearing close to the second bearing, and when the first disassembly stud is screwed toward the first bearing, it can push against the first bearing.

[0012] In one embodiment, two O-rings are provided between the first disassembly stud and the first bearing housing.

[0013] In one embodiment, there are two first disassembly studs, which are symmetrically arranged on the first bearing housing about the axis of the first bearing housing.

[0014] In one embodiment, the main shaft device of the drum-shaped filter screen further includes a second disassembly stud, and one end of the second bearing seat is provided with a second disassembly through hole, which is threadedly engaged with the second disassembly stud; the second disassembly stud is located on the side of the second bearing close to the first bearing, and when the second disassembly stud is screwed toward the second bearing, it can push against the second bearing.

[0015] In one embodiment, two O-rings are provided between the second disassembly stud and the second bearing housing.

[0016] In one embodiment, there are two second disassembly studs, which are arranged symmetrically about the axis of the second bearing housing.

[0017] In one embodiment, the top of the first bearing housing is provided with a first oil injection hole, the bottom of the first bearing housing is provided with a first oil drain hole and a first oil plug that is detachably engaged with the first oil drain hole; the top of the second bearing housing is provided with a second oil injection hole, the bottom of the second bearing housing is provided with a second oil drain hole and a second oil plug that is detachably engaged with the second oil drain hole.

[0018] In one embodiment, the main shaft assembly of the drum-shaped filter screen further includes a first brush cover and a second brush cover, wherein the first brush cover is sealed to the side of the first brush box away from the first bearing seat, and the second brush cover is sealed to the side of the second brush box away from the second bearing seat.

[0019] In one embodiment, the main shaft device of the drum-shaped filter screen further includes a first support plate and a second support plate. The bottom of the first bearing seat is connected to the first support plate, and the bottom of the first support plate is provided with a hook-shaped anchor bolt. The bottom of the second bearing seat is connected to the second support plate, and the bottom of the second support plate is provided with a hook-shaped anchor bolt.

[0020] In actual use, the aforementioned drum-shaped filter's main shaft assembly is electrically connected to the first current collector flange and the drum-shaped filter's cathodic protection system. The cathodic protection system of the drum-shaped filter is then electrically connected to the first brush shaft via the first current collector flange, which in turn is electrically connected to the main shaft, and finally to the drum-shaped filter via the main shaft, thus achieving cathodic protection. The second current collector flange is electrically connected to the drum-shaped filter's potential measuring device. This device is then electrically connected to the second brush shaft via the second current collector flange, which in turn is electrically connected to the main shaft, and finally to the drum-shaped filter via the main shaft, thus achieving potential measurement. Therefore, the cathodic protection system and potential measuring device of the drum filter are electrically connected to the main shaft through the first brush shaft and the second brush shaft, respectively. That is, the cathodic protection system and the potential measuring device are electrically connected to the main shaft through independent cathode busbar circuits (first brush shaft) and potential measuring circuits (second brush shaft), respectively. Thus, the potential measuring circuit is not affected by the cathode busbar circuit, ensuring the accuracy of the potential measurement of the drum filter. This ensures that the potential of the drum filter is always within the protection range, which helps to improve the effectiveness of cathodic protection and thus improves the corrosion resistance of the drum filter. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the main shaft device of a drum-shaped filter screen according to one embodiment;

[0022] Figure 2 for Figure 1 Schematic diagram of the fixed end of the spindle assembly;

[0023] Figure 3 for Figure 2 A schematic diagram of the structure of the first brush box in the middle;

[0024] Figure 4 for Figure 2 A sectional view;

[0025] Figure 5 for Figure 4 A magnified view of the joint between the first bushing and the main shaft;

[0026] Figure 6 for Figure 1 Schematic diagram of the floating end of the central spindle assembly;

[0027] Figure 7 for Figure 6 A schematic diagram of the structure of the second brush box;

[0028] Figure 8 for Figure 6 A sectional view;

[0029] Figure 9 for Figure 8Enlarged view of the connection between the second disassembly stud, the second bearing housing, and the second bearing.

[0030] Explanation of icon numbers:

[0031] 110. Main spindle; 111. Shaft body; 1111. First semi-cylindrical hole; 112. First section; 113. Second section; 114. Third section; 115. Fourth section;

[0032] 120. First bearing; 121. First bearing housing; 122. First oil filling hole; 123. First oil drain hole; 124. First oil plug; 128. First bearing removal sleeve;

[0033] 130. Second bearing; 131. Second bearing housing; 135. Second disassembly stud; 137. Second bearing withdrawal sleeve; 138. O-ring seal;

[0034] 140. First brush shaft; 141. First brush holder; 142. First slip flange; 143. First brush cap; 145. First slip ring;

[0035] 150. Second brush shaft; 151. Second brush holder; 152. Second slip flange; 153. Second brush cap; 154. Second slip ring;

[0036] 160. First bushing; 161. Second semi-cylindrical hole; 162. First cylindrical hole; 163. First saddle pin; 164. First sealing packing;

[0037] 170. Second bushing; 173. Second saddle pin; 174. Second sealing packing;

[0038] 181. First support pad; 182. Second support pad; 183. Hook-shaped anchor bolt. Detailed Implementation

[0039] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0040] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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 invention.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0045] Please refer to Figure 1 One embodiment of this application provides a spindle device for a drum-shaped filter. Combined with... Figure 2 , Figure 4 , Figure 6 and Figure 8 The main shaft assembly of the drum-shaped filter screen includes: a main shaft 110, a first bearing 120, a first bearing housing 121, a second bearing 130, a second bearing housing 131, a first brush shaft 140, a first brush box 141, a second brush shaft 150, and a second brush box 151. The fixed end of the main shaft 110 is mounted on the first bearing housing 121 via the first bearing 120, and the floating end of the main shaft 110 is mounted on the second bearing housing 131 via the second bearing 130.

[0046] The first brush holder 141 is sealed to the side of the first bearing housing 121 opposite to the second bearing housing 131. One end of the first brush shaft 140 is connected to the fixed end of the main shaft 110, and the first brush shaft 140 is located inside the first brush holder 141. (Reference) Figure 3 A first collector flange 142 is provided on the outer wall of the first brush box 141. The first collector flange 142 is electrically connected to the first brush shaft 140 and is used for electrical connection with the cathodic protection system of the drum filter.

[0047] The second brush holder 151 is sealed to the side of the second bearing housing 131 opposite to the first bearing housing 121. One end of the second brush shaft 150 is connected to the floating end of the main shaft 110, and the second brush shaft 150 is located inside the second brush holder 151. (Reference) Figure 7 A second collector flange 152 is provided on the outer wall of the second brush box 151. The second collector flange 152 is electrically connected to the second brush shaft 150 and is used to electrically connect to the potential measuring device of the drum filter.

[0048] In actual use, the aforementioned drum-shaped filter's main shaft assembly connects the first collector flange 142 to the cathodic protection system of the drum-shaped filter. The cathodic protection system of the drum-shaped filter is then electrically connected to the first brush shaft 140 via the first collector flange 142, which in turn connects to the main shaft 110, and further to the drum-shaped filter via the main shaft 110, thus achieving cathodic protection. Similarly, the second collector flange 152 connects to the potential measuring device of the drum-shaped filter. This device is then electrically connected to the second brush shaft 150 via the second collector flange 152, which in turn connects to the main shaft 110, and further to the drum-shaped filter via the main shaft 110, thus achieving potential measurement. Therefore, the cathodic protection system and potential measuring device of the drum filter are electrically connected to the main shaft 110 through the first brush shaft 140 and the second brush shaft 150, respectively. That is, the cathodic protection system and the potential measuring device are electrically connected to the main shaft 110 through independent cathode bus circuits (first brush shaft 140) and potential measuring circuits (second brush shaft 150), respectively. Thus, the potential measuring circuit is not affected by the cathode bus circuit, ensuring the accuracy of the potential measurement of the drum filter. This ensures that the potential of the drum filter is always within the protection range, which helps to improve the effectiveness of cathodic protection and thus improves the corrosion resistance of the drum filter.

[0049] Please refer to Figure 4 In one embodiment, a first slip ring 145 is provided at the end of the first brush shaft 140 away from the main shaft 110, and the first slip ring 145 is electrically connected to the first slip flange 142. Thus, the arrangement of the first slip ring 145 allows the first brush shaft 140 to rotate with the main shaft 110, while the first slip flange 142 does not rotate.

[0050] Please refer to Figure 8 In one embodiment, a second slip ring 154 is provided at the end of the second brush shaft 150 away from the main shaft 110, and is electrically connected to the second slip flange 152 through the second slip ring 154. Thus, the arrangement of the second slip ring 154 allows the second brush shaft 150 to rotate with the main shaft 110, while the second slip flange 152 does not rotate.

[0051] Please refer to Figure 4 In one embodiment, the spindle 110 includes a first segment 112, a second segment 113 and a shaft body 111 with increasing outer diameters. The two ends of the second segment 113 are connected to the first segment 112 and the shaft body 111 respectively. Thus, a shoulder is formed at the connection between the second segment 113 and the first segment 112, and a shoulder is formed at the connection between the shaft body 111 and the second segment 113.

[0052] The first bearing 120 is connected to the first segment 112 (the first segment 112 is the fixed end of the main shaft 110), and the first segment 112 is mounted on the first bearing housing 121 via the first bearing 120. Specifically, the inner ring of the first bearing 120 can be mounted on the first segment 112 via the first bearing withdrawal sleeve 128.

[0053] The second section 113 is fitted with a first bushing 160. (Combined) Figure 5 A first semi-cylindrical hole 1111 is provided at the shoulder formed at the connection between the second segment 113 and the shaft body 111. A second semi-cylindrical hole 161 is provided at the end of the first bushing 160 facing the shaft body 111. The first semi-cylindrical hole 1111 and the second semi-cylindrical hole 161 form a first cylindrical hole 162, and a first saddle pin 163 is provided inside the first cylindrical hole 162. Thus, the first saddle pin 163 ensures that the first bushing 160 rotates together with the main shaft 110, preventing wear on the main shaft 110 caused by the rotation of the first bushing 160 relative to the main shaft 110. The first saddle pin 163 can be welded to the first bushing 160.

[0054] Please refer to Figure 4 In one embodiment, the first bearing housing 121 is sleeved outside the first bushing 160, and a first sealing packing 164 is provided between the first bearing housing 121 and the first bushing 160, so that the first sealing packing 164 can enhance the sealing performance of the first bearing housing 121.

[0055] Please refer to Figure 8 In one embodiment, the spindle 110 includes a third segment 114, a fourth segment 115 with increasing outer diameters, and a shaft body 111. The two ends of the fourth segment 115 are connected to the third segment 114 and the shaft body 111, respectively. Thus, a shoulder is formed at the connection between the fourth segment 115 and the third segment 114, and a shoulder is formed at the connection between the shaft body 111 and the fourth segment 115.

[0056] The second bearing 130 is connected to the third section 114 (the third section 114 is the floating end of the main shaft 110), and the third section 114 is mounted on the second bearing housing 131 via the second bearing 130. Specifically, the inner ring of the second bearing 130 can be mounted on the third section 114 via the second bearing withdrawal sleeve 137.

[0057] A second bushing 170 is fitted onto the fourth segment 115. A third semi-cylindrical hole (not shown) is provided at the shoulder formed at the connection between the fourth segment 115 and the shaft body 111. A fourth semi-cylindrical hole (not shown) is provided at the end of the second bushing 170 facing the shaft body 111. The third and fourth semi-cylindrical holes form a second cylindrical hole, in which a second saddle pin 173 is disposed. Thus, the second saddle pin 173 ensures that the second bushing 170 rotates together with the main shaft 110, preventing wear on the main shaft 110 caused by the rotation of the second bushing 170 relative to the main shaft 110. The second saddle pin 173 can be welded to the second bushing 170.

[0058] Please refer to Figure 8 In one embodiment, the second bearing housing 131 is sleeved outside the second bushing 170, and a second sealing packing 174 is provided between the second bearing housing 131 and the second bushing 170, so that the second sealing packing 174 can enhance the sealing performance of the second bearing housing 131.

[0059] Please refer to Figure 4 and Figure 8 In one embodiment, the main shaft assembly of the drum filter screen further includes a first brush cover 143 and a second brush cover 153. The first brush cover 143 is sealed to the side of the first brush holder 141 opposite to the first bearing seat 121, thereby ensuring that the first brush shaft 140 is sealed within the first brush holder 141. The second brush cover 153 is sealed to the side of the second brush holder 151 opposite to the second bearing seat 131, thereby ensuring that the second brush shaft 150 is sealed within the second brush holder 151.

[0060] Please refer to Figure 4 In one embodiment, the top of the first bearing housing 121 is provided with a first oil injection hole 122, and the bottom of the first bearing housing 121 is provided with a first oil drain hole 123 and a first oil plug 124 detachably engaged with the first oil drain hole 123. The first oil injection hole 122 is used to inject lubricating oil into the first bearing housing 121 to lubricate the first bearing 120. During the operation of the drum filter, the first oil plug 124 blocks the first oil drain hole 123 to prevent oil from flowing out of the first oil drain hole 123. When it is necessary to replace the lubricating oil in the first bearing housing 121, the first oil plug 124 can be opened, so that the lubricating oil flows out from the first oil drain hole 123.

[0061] The second bearing housing 131 has a second oil injection hole (not shown) at its top and a second oil drain hole and a second oil plug (not shown) detachably fitted to the second oil drain hole (not shown) at its bottom. The second oil injection hole is used to inject lubricating oil into the second bearing housing 131 to lubricate the second bearing 130. During the operation of the drum filter, the second oil plug blocks the second oil drain hole to prevent oil from flowing out. When it is necessary to replace the lubricating oil in the second bearing housing 131, the second oil plug can be opened to allow the lubricating oil to flow out from the second oil drain hole.

[0062] In one embodiment, the main shaft assembly of the drum-shaped filter screen includes a first disassembly stud (not shown), and a first disassembly through hole (not shown) is provided at one end of the first bearing seat 121. The first disassembly through hole is threadedly engaged with the first disassembly stud. The first disassembly stud is located on the side of the first bearing 120 near the second bearing 130. When the first disassembly stud is screwed into the first bearing 120, it can push against the first bearing 120.

[0063] When it is necessary to disassemble the first bearing 120, the first disassembly stud can be rotated with a tool, causing the first disassembly stud to extend into the first disassembly through hole in a direction closer to the first bearing 120. As the first disassembly stud continues to be screwed in, it can push against the first bearing 120, thereby pushing the first bearing 120 out of the first bearing seat 121. It can be seen that the first disassembly stud facilitates the disassembly of the first bearing 120.

[0064] In one embodiment, two O-rings are provided between the first disassembly stud and the first bearing housing 121 to improve the sealing performance of the first bearing housing 121.

[0065] In one embodiment, there are two first disassembly studs, which are symmetrically arranged on the first bearing housing 121 about its axis. When the first bearing 120 needs to be disassembled, the two first disassembly studs are rotated simultaneously to push the first bearing 120 out, which can prevent the first bearing 120 from getting stuck during the process of being pushed out, and facilitate the smooth disassembly of the first bearing 120.

[0066] Please refer to Figure 8 and Figure 9 In one embodiment, the main shaft assembly of the drum-shaped filter screen includes a second disassembly stud 135. One end of the second bearing seat 131 is provided with a second disassembly through hole (not shown), which is threadedly engaged with the second disassembly stud 135. The second disassembly stud 135 is located on the side of the second bearing 130 closest to the first bearing 120. When the second disassembly stud 135 is screwed into the second bearing 130, it can push against the second bearing 130.

[0067] When it is necessary to disassemble the second bearing 130, the second disassembly stud 135 can be rotated with a tool, causing the second disassembly stud 135 to extend into the second disassembly through hole in a direction closer to the second bearing 130. As the second disassembly stud 135 continues to be screwed in, it can push against the second bearing 130, thereby pushing the second bearing 130 out of the second bearing seat 131. It can be seen that the second disassembly stud 135 facilitates the disassembly of the second bearing 130.

[0068] Please refer to Figure 9 Two O-rings 138 are provided between the second disassembly stud 135 and the second bearing housing 131 to improve the sealing performance of the second bearing housing 131.

[0069] Please refer to Figure 8 In one embodiment, there are two second disassembly studs 135, which are symmetrically arranged on the second bearing housing 131 about its axis. When the second bearing 130 needs to be disassembled, the two second disassembly studs 135 are rotated simultaneously to push the second bearing 130 out, which can prevent the second bearing 130 from getting stuck during the process of being pushed out, and facilitate the smooth disassembly of the second bearing 130.

[0070] Please refer to Figure 2 and Figure 6 In one embodiment, the main shaft assembly of the drum-shaped filter screen includes a first support plate 181 and a second support plate 182. The bottom of the first bearing seat 121 is connected to the first support plate 181, and the bottom of the first support plate 181 is provided with a hook-shaped anchor bolt 183. The bottom of the second bearing seat 131 is connected to the second support plate 182, and the bottom of the second support plate 182 is provided with a hook-shaped anchor bolt 183.

[0071] In actual construction, the hook-shaped anchor bolts 183 at the bottom of the first support plate 181 and the hook-shaped anchor bolts 183 at the bottom of the second support plate 182 are connected to the reinforcing bars in the concrete foundation, and then the hook-shaped anchor bolts 183 are poured with concrete for a second time to ensure that the main shaft device of the drum-shaped filter screen is fixed on the concrete foundation.

[0072] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A main shaft device for a drum-shaped filter screen, characterized in that, include: The main shaft comprises a first bearing, a first bearing housing, a second bearing, a second bearing housing, a first brush shaft, a first brush holder, a second brush shaft, and a second brush holder; the fixed end of the main shaft is mounted on the first bearing housing via the first bearing, and the floating end of the main shaft is mounted on the second bearing housing via the second bearing. The first brush box is sealed to the side of the first bearing housing opposite to the second bearing housing. One end of the first brush shaft is connected to the fixed end of the main shaft. The first brush shaft is located inside the first brush box. A first collector flange is provided on the outer wall of the first brush box. The first collector flange is electrically connected to the first brush shaft and is used for electrical connection with the cathodic protection system of the drum filter. The second brush box is sealed to the side of the second bearing housing opposite to the first bearing housing. One end of the second brush shaft is connected to the floating end of the main shaft. The second brush shaft is located inside the second brush box. A second current collector flange is provided on the outer wall of the second brush box. The second current collector flange is electrically connected to the second brush shaft and is used to electrically connect to the potential measuring device of the drum filter.

2. The main shaft device for the drum-shaped filter screen according to claim 1, characterized in that, The main shaft includes a first section, a second section, and a shaft body with sequentially increasing outer diameters. The two ends of the second section are connected to the first section and the shaft body, respectively. The first bearing is connected to the first section. A first bushing is fitted on the second section. A first semi-cylindrical hole is provided at the shoulder formed at the connection between the second section and the shaft body. A second semi-cylindrical hole is provided at the end of the first bushing facing the shaft body. The first semi-cylindrical hole and the second semi-cylindrical hole form a first cylindrical hole. A first saddle pin is provided in the first cylindrical hole.

3. The main shaft device for the drum-shaped filter screen according to claim 1, characterized in that, The main shaft includes a third section, a fourth section with successively increasing outer diameters, and a shaft body. The two ends of the fourth section are connected to the third section and the shaft body, respectively. The second bearing is connected to the third section. A second bushing is fitted on the fourth section. A third semi-cylindrical hole is provided at the shoulder formed at the connection between the fourth section and the shaft body. A fourth semi-cylindrical hole is provided at one end of the second bushing facing the shaft body. The third semi-cylindrical hole and the fourth semi-cylindrical hole form a second cylindrical hole. A second saddle pin is provided in the second cylindrical hole.

4. The main shaft device for the drum-shaped filter screen according to claim 1, characterized in that, It also includes a first disassembly stud, one end of the first bearing housing is provided with a first disassembly through hole, the first disassembly through hole is threadedly engaged with the first disassembly stud; the first disassembly stud is located on the side of the first bearing close to the second bearing, and when the first disassembly stud is screwed into the first bearing, it can push against the first bearing.

5. The main shaft device for the drum-shaped filter screen according to claim 4, characterized in that, Two O-rings are provided between the first disassembly stud and the first bearing housing.

6. The main shaft device for the drum-shaped filter screen according to claim 4, characterized in that, The number of the first disassembly studs is two, and the two first disassembly studs are arranged symmetrically about the axis of the first bearing housing.

7. The main shaft device for the drum-shaped filter screen according to claim 1, characterized in that, It also includes a second disassembly stud, one end of the second bearing housing is provided with a second disassembly through hole, the second disassembly through hole is threadedly engaged with the second disassembly stud; the second disassembly stud is located on the side of the second bearing close to the first bearing, and when the second disassembly stud is screwed into the second bearing, it can push against the second bearing.

8. The main shaft device for the drum-shaped filter screen according to claim 7, characterized in that, Two O-rings are provided between the second disassembly stud and the second bearing housing.

9. The main shaft device for the drum-shaped filter screen according to claim 7, characterized in that, The number of the second disassembly studs is two, and the two second disassembly studs are arranged symmetrically about the axis of the second bearing housing on the second bearing housing.

10. The main shaft device for the drum-shaped filter screen according to claim 1, characterized in that, The first bearing housing has a first oil injection hole at its top and a first oil drain hole and a first oil plug that is detachably fitted to the first oil drain hole at its bottom; the second bearing housing has a second oil injection hole at its top and a second oil drain hole and a second oil plug that is detachably fitted to the second oil drain hole at its bottom.

11. The main shaft device for the drum-shaped filter screen according to claim 1, characterized in that, It also includes a first brush cover and a second brush cover, wherein the first brush cover is sealed to the side of the first brush box away from the first bearing seat, and the second brush cover is sealed to the side of the second brush box away from the second bearing seat.

12. The main shaft device for the drum-shaped filter screen according to claim 1, characterized in that, It also includes a first support pad and a second support pad, the bottom of the first bearing housing is connected to the first support pad, and the bottom of the first support pad is provided with a hook-shaped anchor bolt; the bottom of the second bearing housing is connected to the second support pad, and the bottom of the second support pad is provided with a hook-shaped anchor bolt.

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