Short stress rolling mill roller bearing oil-gas lubricating structure and assembling method thereof
By optimizing the lubrication structure and assembly method of the short-stress rolling mill roll bearings, the problems of unreasonable lubrication point settings and heat dissipation were solved, achieving efficient lubrication and stable operation of the bearings and extending their service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- WUKUN STEEL
- Filing Date
- 2024-04-16
- Publication Date
- 2026-07-31
AI Technical Summary
Improperly designed lubrication points in short-stress rolling mill bearings lead to insufficient oil and gas supply, preventing effective heat dissipation and causing the bearings to overheat and burn out, resulting in insufficient service life.
The oil-air lubrication structure of the roll bearing was optimized, and four oil inlet holes and exhaust holes were reasonably set to ensure smooth oil and air supply and effective heat dissipation. The lubrication effect was significantly improved through the improved assembly method.
It significantly improves bearing lubrication, reduces bearing temperature rise, extends service life, reduces bearing burn-out failures, enhances the working stability of the rolling mill, and reduces bearing consumption.
Smart Images
Figure CN118204367B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of metallurgical equipment technology, and further to the field of steel rolling equipment technology, specifically relating to an oil-air lubrication structure for a short-stress rolling mill roll bearing and its assembly method. Background Technology
[0002] Short-stress rolling mills are key equipment in steel rolling. Currently, bearings in short-stress rolling mills primarily use online oil-air lubrication. Oil-air lubrication is a novel two-phase gas-liquid fluid lubrication and cooling technology for rolling mill bearings. This technology can finely atomize the oil and gas and precisely spray it to each lubrication point within the bearing housing. Oil consumption is lower than traditional dry oil lubrication, improving the lubrication effect of rolling mill bearings while extending their service life. The improved lubrication effectively reduces the workload of rolling mill assembly and maintenance costs. Oil-air lubrication represents the current application and development trend of rolling mill bearing lubrication technology, but current oil-air lubrication methods have the following shortcomings: 1. The lubrication points on the rolling mill bearing housing are not set properly. When the oil supply hole of the bearing housing supplies oil to the four rows of cylindrical roller bearings through the stationary labyrinth end cover, the oil hole of the stationary labyrinth end cover is blocked by the lip seal, resulting in insufficient oil and gas supply, poor bearing lubrication effect, easy overheating, and high bearing burn-out failure rate.
[0003] 2. No vent is provided. Due to the good sealing performance on both sides of the roll bearing housing, the heat generated by the roll bearing during long-term operation cannot be completely discharged through the oil and gas circulation pipeline, causing the bearing temperature to gradually rise and eventually resulting in bearing burnout.
[0004] Due to the aforementioned problems, the bearing's service life cannot reach the designed rated steel throughput of 350,000 tons. Therefore, researching and developing an oil-air lubrication structure and its assembly method for short-stress rolling mill roll bearings is key to solving this problem. Summary of the Invention
[0005] The first objective of this invention is to provide an oil-air lubrication structure for short-stress rolling mill roll bearings. This structure optimizes the lubrication points on the roll box, makes the oil inlet hole positions more reasonable, and provides convenient oil-air lubrication with four oil inlets, significantly improving the lubrication effect. The vent hole is simple and easy to set, requiring only two small holes to be drilled at specific locations. The second objective is to provide an assembly method for the oil-air lubrication structure for short-stress rolling mill roll bearings.
[0006] The first objective of this invention is achieved as follows: the oil-air lubrication structure for the short-stress rolling mill roll bearing includes a roll box, a labyrinth end cover, a stationary labyrinth, an inner skeleton oil seal I, a four-row cylindrical roller bearing, an annular oil groove, an inner skeleton oil seal II, a thrust bearing end cover, oil inlet A, oil inlet B, oil inlet C, oil inlet D, oil outlet A1, oil outlet A2, oil outlet B1, oil outlet C1, oil outlet D1, vent E, and vent F. The roll box is divided into one drive side and one operating side, symmetrically arranged. A labyrinth end cover is provided on the outer side of the drive side roll box. A stationary labyrinth is provided on the inner side of the drive side roll box. An inner skeleton oil seal II is provided at the inner hole of the labyrinth end cover, and an oil outlet C1 is provided on the inner end face. An inner skeleton oil seal I is installed in the inner hole of the labyrinth, and an oil outlet B1 is provided on the inner end face; four rows of cylindrical roller bearings are installed in the inner hole of the roller box; oil outlets A1 and A2 are respectively provided on the outer rings of the four rows of cylindrical roller bearings; annular oil grooves are respectively provided on the inner hole of the roller box corresponding to oil outlets A1 and A2; oil inlets A, B, and C are arranged side by side on the outer side of the drive-side roller box; an oil inlet D is provided on the side of the labyrinth end cover, an oil outlet D1 is correspondingly provided on the inner end face, and an exhaust hole E is provided on the outer end face; the thrust bearing end cover is installed at the end of the roll and is installed in conjunction with the roll neck sleeve and the double-direction thrust tapered roller bearing; an exhaust hole F is provided on the thrust bearing end cover.
[0007] The oil-air lubrication structure for short-stress rolling mill roll bearings of this invention comprises a roll box, a labyrinth end cover, a stationary labyrinth, an inner skeleton oil seal I, four rows of cylindrical roller bearings, an annular oil groove, an inner skeleton oil seal II, a thrust bearing end cover, oil inlet A, oil inlet B, oil inlet C, oil inlet D, oil outlet A1, oil outlet A2, oil outlet B1, oil outlet C1, oil outlet D1, vent E, and vent F. This invention optimizes the lubrication points on the roll box, with a more rational placement of the oil inlet positions. The oil-air lubrication method with four oil inlets is more convenient, significantly improving the lubrication effect. The vent design is simple and easy to implement, requiring only two small holes drilled at specific locations.
[0008] The oil-air lubrication structure for short-stress rolling mill roll bearings of this invention provides excellent lubrication and smooth heat dissipation, effectively reducing bearing temperature rise and extending bearing service life. The frequency of rolling mill bearing burnout failures has decreased from 1-2 times per month to six consecutive months without any burnouts, and the steel throughput has exceeded 500,000 tons. This has resulted in significant benefits such as reduced workload, stable operation, and lower bearing consumption.
[0009] The second objective of this invention is achieved by the following operational steps: (1) When assembling the outer ring of the bearing of the transmission side roller box, it is necessary to ensure that the oil outlet A1, oil outlet A2 and the annular oil groove form a lubrication passage.
[0010] (2) The six arc-shaped lubricating oil grooves on the left and right end faces of the outer ring of the bearing are symmetrical and evenly distributed, with each groove spaced 60 degrees apart, and the first groove should be installed at the 12 o'clock position directly above the bearing mounting hole of the roller box.
[0011] (3) When assembling the static labyrinth, first assemble the inner skeleton oil seal I onto the static labyrinth, using transition fit assembly, and then install the static labyrinth; the lubricating oil groove of the static labyrinth is installed at the 12 o'clock position directly above the roller box bearing mounting hole, forming hole B1 with the arc-shaped lubricating oil groove directly above.
[0012] (4) When assembling the labyrinth end cover, first assemble the inner skeleton oil seal II onto the labyrinth end cover using a transition fit, and then install the labyrinth end cover; the lubricating oil groove of the labyrinth end cover is installed at 60 degrees above the right of the roller box bearing mounting hole, i.e., at the 2 o'clock position, forming hole C1 with the arc-shaped lubricating oil groove at 60 degrees above the right, and forming hole D1 with the arc-shaped lubricating oil groove at 120 degrees below the right at the 4 o'clock position.
[0013] (5) After inserting the quick-connect oil and gas connector and the transparent PU oil and gas pipe into the oil inlet A, oil inlet B, oil inlet C and oil inlet D, connect them to the secondary oil and gas distributor to supply oil and gas to the rolling mill bearing normally.
[0014] (6) When assembling the operating side roller box, install it in the same way as described above. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the lubrication oil circuit arrangement of the transmission side roller box of the present invention; Figure 2 for Figure 1 Sectional view of section I-I (oil circuit A~A1, A~A2); Figure 3 for Figure 1 Schematic diagram of section II-II (oil circuit B~B1); Figure 4 for Figure 1 Schematic diagram of section III-III (oil circuit C~C1); Figure 5 for Figure 1 Schematic diagram of section IV-IV (oil passages D-D1, vent E); Figure 6 This is a schematic diagram of the exhaust port F of the operating side roller box of the present invention.
[0016] In the diagram: 1-Roller box, 2-Labyrinth end cover, 3-Static labyrinth, 4-Inner skeleton oil seal I, 5-Four-row cylindrical roller bearing, 51-Bearing outer ring, 52-Four-row cylindrical roller, 53-Bearing cage, 54-Bearing inner ring, 6-Annular oil groove, 7-Inner skeleton oil seal II, 8-Thrust bearing end cover, 9-Inner moving labyrinth, 10-Roll, 11-Outer moving labyrinth, 12-Roll neck sleeve, 13-Double thrust tapered roller bearing, 14-External threaded sleeve, 15-Sealing ring, 16-Bolt, A-Oil inlet, B-Oil inlet, C-Oil inlet, D-Oil inlet, A1-Oil outlet, A2-Oil outlet, B1-Oil outlet, C1-Oil outlet, D1-Oil outlet, E-Vent, F-Vent. Detailed Implementation
[0017] The present invention will be further described below with reference to the accompanying drawings, but this is not intended to limit the present invention in any way. Any modifications made based on the teachings of the present invention shall fall within the protection scope of the present invention.
[0018] like Figures 1-6 As shown, the oil-air lubrication structure for the short-stress rolling mill roll bearing of the present invention includes a roll box 1, a labyrinth end cover 2, a stationary labyrinth 3, an inner skeleton oil seal I 4, a four-row cylindrical roller bearing 5, an annular oil groove 6, an inner skeleton oil seal II 7, a thrust bearing end cover 8, oil inlet A, oil inlet B, oil inlet C, oil inlet D, oil outlet A1, oil outlet A2, oil outlet B1, oil outlet C1, oil outlet D1, vent E, and vent F. The roll box 1 is divided into one drive side and one operating side, which are symmetrically arranged. The labyrinth end cover 2 is provided on the outer side of the drive side roll box 1. The stationary labyrinth 3 is provided on the inner side of the drive side roll box 1. The inner skeleton oil seal II 7 is provided in the inner hole of the labyrinth end cover 2, and the oil outlet C1 is provided on the inner end face. The stationary labyrinth 3 is provided in the inner hole of the labyrinth end cover 2. An inner skeleton oil seal I4 is provided, with an oil outlet B1 on its inner end face; four rows of cylindrical roller bearings 5 are provided in the inner hole of the roller box 1; oil outlets A1 and A2 are respectively provided on the outer rings of the four rows of cylindrical roller bearings 5; annular oil grooves 6 are respectively provided on the inner hole of the roller box 1 at the locations corresponding to oil outlets A1 and A2; oil inlets A, B, and C are arranged side by side on the outer side of the transmission side roller box 1; an oil inlet D is provided on the side of the labyrinth end cover 2, with an oil outlet D1 correspondingly provided on its inner end face, and an exhaust hole E is provided on its outer end face; the thrust bearing end cover 8 is provided at the end of the roll 10 and is installed in conjunction with the roll neck sleeve 12 and the double-direction thrust tapered roller bearing 13; an exhaust hole F is provided on the thrust bearing end cover 8.
[0019] The oil inlet holes A, B, C, and D are all provided with internal threaded holes, and the inner diameter is ∮8mm.
[0020] The four-row cylindrical roller bearing 5 includes an outer ring 51, four rows of cylindrical rollers 52, a bearing cage 53, and an inner ring 54. The outer ring 51, four rows of cylindrical rollers 52, bearing cage 53, and inner ring 54 are assembled as a single unit. Six arc-shaped lubricating oil grooves are respectively provided on both ends of the outer ring 51, with a depth of 2.1 mm and a radius of 20 mm.
[0021] The oil and gas enter through hole A and exit through holes A1 and A2. Holes A1 and A2, together with the annular oil groove 6, form a lubrication passage. The annular oil groove 6 is arranged on the inner hole of the roller box 1, with a width of 15mm, an inner diameter the same as the inner hole of the roller box 1, and an outer diameter 3mm larger than the inner hole of the roller box 1. Holes A1 and A2 are set on the outer ring 51 of the bearing and lead directly to the bearing cage 53. The cross-sectional shape of holes A1 and A2 is a circular hole with a diameter of ∮8mm, so that the oil and gas can lubricate the bearing cage 53 in the middle of the four rows of cylindrical rollers 52, and then lubricate the cylindrical rollers in the middle of the bearing cage 53.
[0022] The static labyrinth 3 is provided with a lubricating oil groove that is 6mm deep and 15mm wide; the B1 hole is a combination of the arc-shaped lubricating oil groove on the right end face of the bearing outer ring 51 and the lubricating oil groove on the static labyrinth 3. It is rectangular in shape and has a large lubrication area. Oil and gas enter through the B hole and exit through the B1 hole, and the oil and gas can lubricate the right end face of the four rows of cylindrical rollers 52.
[0023] The labyrinth end cap 2 is provided with a lubricating oil groove that is 6mm deep and 15mm wide; the C1 hole is a combination of the arc-shaped lubricating oil groove on the left end face of the bearing outer ring 51 and the lubricating oil groove on the labyrinth end cap 2. It is rectangular in shape and has a large lubrication area. Oil and gas enter through the C hole and exit through the C1 hole, and the oil and gas can lubricate the left end face of the four rows of cylindrical rollers 52.
[0024] The oil inlet D is offset from the oil inlet A, oil inlet B, and oil inlet C by a certain angle. The labyrinth end cap 2 is provided with a lubricating oil groove that is 6mm deep and 15mm wide. The D1 hole is formed by combining the arc-shaped lubricating oil groove on the left end face of the bearing outer ring 51 and another set of lubricating oil grooves on the labyrinth end cap 2. It is rectangular in shape, with a large lubrication area, and the oil and gas can lubricate the left end face of the four rows of cylindrical rollers 52.
[0025] The vent E is located on the outer side of the labyrinth end cap 2 and the sealing side of the inner skeleton oil seal II 7. The vent E is a through hole with a diameter of ∮3~5mm and is oriented toward the end face of the four rows of cylindrical rollers 52.
[0026] The operating side roller box 1 is also provided with oil inlet holes A, B, C, and D, and oil outlet holes A1, A2, B1, C1, and D1. The only difference is that the exhaust hole F is located on the outside of the thrust bearing end cover 8, on the sealing side of the sealing ring 15; the exhaust hole F is a through hole with a diameter of ∮3~5mm, and its direction is towards the end face of the four rows of cylindrical rollers 52.
[0027] The assembly method of the oil-air lubrication structure for the short-stress rolling mill roll bearing of the present invention specifically includes the following steps: (1) When assembling the outer ring 51 of the bearing of the transmission side roller box 1, it is necessary to ensure that the oil outlet A1, oil outlet A2 and the annular oil groove 6 are combined to form a lubrication passage.
[0028] (2) The six arc-shaped lubricating oil grooves on the left and right end faces of the outer ring 51 of the bearing are symmetrical and evenly distributed, with each groove spaced 60 degrees apart, and the first groove should be installed at the 12 o'clock position directly above the bearing mounting hole of the roller box 1.
[0029] (3) When assembling the static labyrinth 3, first assemble the inner skeleton oil seal I4 onto the static labyrinth 3, using a transition fit assembly, and then install the static labyrinth 3; the lubricating oil groove of the static labyrinth 3 is installed at the 12 o'clock position directly above the bearing mounting hole of the roller box 1, forming hole B1 with the arc-shaped lubricating oil groove directly above.
[0030] (4) When assembling the labyrinth end cover 2, first assemble the inner skeleton oil seal II 7 onto the labyrinth end cover 2, using a transition fit assembly, and then install the labyrinth end cover 2; the lubricating oil groove of the labyrinth end cover 2 is installed at 60 degrees above the right of the bearing mounting hole of the roller box 1, i.e., at the 2 o'clock position, forming hole C1 with the arc-shaped lubricating oil groove at 60 degrees above the right, and forming hole D1 with the arc-shaped lubricating oil groove at 120 degrees below the right at the 4 o'clock position.
[0031] (5) After inserting the quick-connect oil and gas connector and the transparent PU oil and gas pipe into the oil inlet A, oil inlet B, oil inlet C and oil inlet D, connect them to the secondary oil and gas distributor to supply oil and gas to the rolling mill bearing normally.
[0032] (6) When assembling the operating side roller box 1, install it in the same way as described above.
[0033] Working principle and process of this invention: This invention optimizes the lubrication points on the roll box 1, making the oil inlet hole positions more reasonable. The four oil inlets provide convenient oil-air lubrication, significantly improving the lubrication effect. The vent hole design is simple and easy, requiring only two small holes drilled at specific locations. The oil-air lubrication structure for short-stress rolling mill roll bearings of this invention provides excellent lubrication, facilitates heat dissipation, and effectively reduces bearing temperature rise.
Claims
1. A short-stress rolling mill roll bearing oil-air lubrication structure, comprising a roll box (1), a labyrinth end cover (2), a stationary labyrinth (3), an inner skeleton oil seal I (4), a four-row cylindrical roller bearing (5), an annular oil groove (6), an inner skeleton oil seal II (7), a thrust bearing end cover (8), oil inlet A, oil inlet B, oil inlet C, oil inlet D, oil outlet A1, oil outlet A2, oil outlet B1, oil outlet C1, oil outlet D1, vent E, and vent F, characterized in that: The roller box (1) is divided into one drive side and one operating side, which are symmetrically arranged; a labyrinth end cover (2) is provided on the outer side of the drive side roller box (1); a static labyrinth (3) is provided on the inner side of the drive side roller box (1); an inner skeleton oil seal II (7) is provided in the inner hole of the labyrinth end cover (2), and an oil outlet C1 is provided on the inner end face; an inner skeleton oil seal I (4) is provided in the inner hole of the static labyrinth (3), and an oil outlet B1 is provided on the inner end face; four rows of cylindrical roller bearings (5) are provided in the inner hole of the roller box (1); oil outlets are respectively provided on the outer rings of the four rows of cylindrical roller bearings (5). A1 and oil outlet A2; annular oil grooves (6) are respectively provided on the inner hole of the roller box (1) corresponding to oil outlet A1 and oil outlet A2; oil inlet A, oil inlet B and oil inlet C are arranged side by side on the outer side of the transmission side roller box (1); oil inlet D is provided on the side of the labyrinth end cover (2), oil outlet D1 is provided on the inner end face, and exhaust hole E is provided on the outer end face; the thrust bearing end cover (8) is provided at the end of the roll (10) and is installed in conjunction with the roll neck sleeve (12) and the double thrust tapered roller bearing (13); exhaust hole F is provided on the thrust bearing end cover (8).
2. The oil-air lubrication structure for short-stress rolling mill roll bearings according to claim 1, characterized in that: The oil inlet holes A, B, C, and D are all provided with internal threaded holes, and the inner diameter is ∮8mm.
3. The oil-air lubrication structure for short-stress rolling mill roll bearings according to claim 1, characterized in that: The four-row cylindrical roller bearing (5) includes an outer ring (51), four rows of cylindrical rollers (52), a bearing cage (53), and an inner ring (54); the outer ring (51), four rows of cylindrical rollers (52), bearing cage (53), and inner ring (54) are assembled as one unit; six arc-shaped lubricating oil grooves are respectively provided on the two end faces of the outer ring (51), with a depth of 2.1 mm and a radius of 20 mm.
4. The oil-air lubrication structure for short-stress rolling mill roll bearings according to claim 3, characterized in that: The oil and gas enter through hole A and exit through holes A1 and A2. Holes A1 and A2, together with the annular oil groove (6), form a lubrication passage. The annular oil groove (6) is arranged on the inner hole of the roller box (1), with a width of 15 mm, an inner diameter the same as the inner hole of the roller box (1), and an outer diameter 3 mm larger than the inner hole of the roller box (1). Holes A1 and A2 are set on the outer ring (51) of the bearing and lead directly to the bearing cage (53). The cross-sectional shape of holes A1 and A2 is a circular hole with a diameter of ∮8 mm, so that the oil and gas can lubricate the bearing cage (53) in the middle of the four rows of cylindrical rollers (52) and then lubricate the cylindrical rollers in the middle of the bearing cage (53).
5. The oil-air lubrication structure for short-stress rolling mill roll bearings according to claim 3, characterized in that: The static labyrinth (3) is provided with a lubricating oil groove that is 6mm deep and 15mm wide; the B1 hole is a combination of the arc-shaped lubricating oil groove on the right end face of the bearing outer ring (51) and the lubricating oil groove on the static labyrinth (3). It is similar in shape to a rectangle, with a large lubrication area. Oil and gas enter through the B hole and exit through the B1 hole. The oil and gas can lubricate the right end face of the four rows of cylindrical rollers (52).
6. The oil-air lubrication structure for short-stress rolling mill roll bearings according to claim 3, characterized in that: The labyrinth end cap (2) is provided with a lubricating oil groove that is 6mm deep and 15mm wide; the C1 hole is a combination of the arc-shaped lubricating oil groove on the left end face of the bearing outer ring (51) and the lubricating oil groove on the labyrinth end cap (2). It is similar in shape to a rectangle, with a large lubrication area. Oil and gas enter through the C hole and exit through the C1 hole. The oil and gas can lubricate the left end face of the four rows of cylindrical rollers (52).
7. The oil-air lubrication structure for short-stress rolling mill roll bearings according to claim 3, characterized in that: The oil inlet D is offset from the oil inlet A, oil inlet B, and oil inlet C by a certain angle. The labyrinth end cap (2) is provided with a lubricating oil groove with a depth of 6mm and a width of 15mm. The D1 hole is composed of an arc-shaped lubricating oil groove on the left end face of the bearing outer ring (51) and another set of lubricating oil grooves on the labyrinth end cap (2). It is similar in shape to a rectangle, with a large lubrication area, and the oil and gas can lubricate the left end face of the four rows of cylindrical rollers (52).
8. The oil-air lubrication structure for short-stress rolling mill roll bearings according to claim 3, characterized in that: The exhaust hole E is located on the outside of the labyrinth end cap (2) and the sealing side of the inner skeleton oil seal II (7). The exhaust hole E is a through hole with a diameter of ∮3~5mm and is oriented toward the end face of the four rows of cylindrical rollers (52).
9. The oil-air lubrication structure for short-stress rolling mill roll bearings according to claim 3, characterized in that: The operating side roller box (1) is also provided with oil inlet holes A, B, C and D, and oil outlet holes A1, A2, B1, C1 and D1. The only difference is that the exhaust hole F is located on the outside of the thrust bearing end cover (8) and the sealing side of the sealing ring (15). The exhaust hole F is a through hole with a diameter of ∮3~5mm and is oriented towards the end face of the four rows of cylindrical rollers (52).
10. An assembly method for the oil-air lubrication structure of a short-stress rolling mill roll bearing as described in claim 9, characterized in that: Specifically, the following steps are included: (1) When assembling the outer ring (51) of the bearing of the transmission side roller box (1), it is necessary to ensure that the oil outlet A1, oil outlet A2 and the annular oil groove (6) are combined to form a lubrication passage. (2) The six arc-shaped lubricating oil grooves on the left and right end faces of the outer ring (51) of the bearing are symmetrical and evenly distributed. Each groove is 60 degrees apart, and the first groove should be installed at the 12 o'clock position directly above the bearing mounting hole of the roller box (1). (3) When assembling the static maze (3), first assemble the inner skeleton oil seal I (4) onto the static maze (3) using transition fit assembly, and then install the static maze (3); the lubricating oil groove of the static maze (3) is installed at the 12 o'clock position directly above the bearing mounting hole of the roller box (1), forming hole B1 with the arc-shaped lubricating oil groove directly above. (4) When assembling the labyrinth end cover (2), first assemble the inner skeleton oil seal II (7) onto the labyrinth end cover (2) using a transition fit assembly, and then install the labyrinth end cover (2); the lubricating oil groove of the labyrinth end cover (2) is installed at 60 degrees to the upper right of the bearing mounting hole of the roller box (1), i.e., at the 2 o'clock position, forming hole C1 with the arc-shaped lubricating oil groove at 60 degrees to the upper right, and forming hole D1 with the arc-shaped lubricating oil groove at 120 degrees to the lower right at the 4 o'clock position; (5) After inserting the quick-connect oil-gas connector and transparent PU oil-gas tube into oil inlet A, oil inlet B, oil inlet C and oil inlet D, connect them to the secondary oil-gas distributor to supply oil-gas to the rolling mill bearing normally. (6) When assembling the operating side roller box (1), install it in the same way as described above.