CN210045758U

CN210045758U - Three-high mill capable of completely separating oil from water

Info

Publication number: CN210045758U
Application number: CN201920602813.6U
Authority: CN
Inventors: 钟天富
Original assignee: Chengdu Golden Machinery Equipment Manufacturing Co Ltd
Current assignee: Chengdu Golden Machinery Equipment Manufacturing Co Ltd
Priority date: 2018-07-20
Filing date: 2019-04-29
Publication date: 2020-02-11
Anticipated expiration: 2029-04-29
Also published as: CN109940045A

Abstract

The utility model discloses an oil-water complete separation's three-high mill, rolling mill incasement portion's major axis and two minor axises are installed at rolling mill incasement through tapered roller bearing and bearing sleeve respectively, the roll at three root of axles middle part is the Y type, the embedded setting of bearing sleeve tip is in the roll, install skeleton formula rubber oil blanket two between bearing sleeve external contact surface and roll, the terminal surface supports tightly with the outer terminal surface of tapered roller bearing inner ring in the bevel gear, seal cover one end supports tightly with the inner terminal surface of tapered roller bearing inner ring, the embedded setting of the other end is in the roll, install skeleton formula rubber oil blanket one and skeleton formula rubber oil blanket three between seal cover and the bearing sleeve, skeleton formula rubber oil blanket one is close to tapered roller bearing inner terminal surface, skeleton formula rubber oil blanket three is in the roll. The utility model discloses replace roll and the sealed three contacts of skeleton rubber with the outer disc of seal cover one end, still install skeleton rubber oil blanket one between bearing housing and seal cover, can realize profit complete separation.

Description

Three-high mill capable of completely separating oil from water

Technical Field

The utility model relates to a rolling mill specifically is a three-high mill of profit complete separation, belongs to the electrical metallurgy machinery trade.

Background

For decades, in the electrical and metallurgical machinery industry, the rolling mill of the continuous casting and rolling production line is used by mixing a three-roll mill and a two-roll mill. The three-high mill is divided into an upper drive three-high mill and a lower drive three-high mill, wherein fig. 1 and 2 are the upper drive three-high mill, and fig. 3 is the lower drive three-high mill.

Now, the above three-roll transmission mill is taken as an example to illustrate the lubrication and cooling conditions of the lubricating oil and the emulsion in the prior art. As shown in fig. 1 and 2, the serial number 1 is a small memorial archway, and 1 piece is arranged on the left and the right; the serial number 2 is an O-shaped rubber sealing ring; the serial number 3 is a rubber block; number 4 is the major axis (i.e., power input shaft); the serial number 5 is a frame (because of two small memorial archway holes, the frame is called as a frame); the serial number 6 is a short shaft, and 1 piece is arranged on the left and the right; the serial number 7 is 4 pieces of bevel gears which are respectively arranged at the two ends of the long shaft 4 and the corresponding ends of the two short shafts 6; the serial number 8 is 4O-shaped rubber sealing strips, and 2 sealing strips are arranged on each small housing 1; the serial number 9 is a tapered roller bearing, 6 parts are provided, and 2 parts are respectively arranged on the long shaft 4 and the two short shafts 6; the serial number 10 is an outer space ring which is sleeved on the long shaft 4 and is positioned between the bevel gear 7 and the tapered roller bearing 9; the serial number 11 is a bearing sleeve which is sleeved outside the tapered roller bearing 9; the number 12 is an inner ring spacer, a roller 15 is arranged between two tapered roller bearings 9 on each shaft, the end heads of the corresponding two bearing seat sleeves 11 are embedded in the roller 15, and framework

rubber oil seals

13 and 14 are respectively arranged between the inner and outer surfaces of the corresponding two bearing seat sleeves and the roller 15; the three rollers 15 on the three shafts are distributed in a 120-degree circle center angle, the three rollers 15 form an inverted Y shape, and an emulsion cavity formed between the three rollers 15 and the rack 5 forms an inverted Y-shaped emulsion cavity, so that the three-roller transmission rolling mill is also called an inverted Y-shaped rolling mill.

The transmission principle of the three-roller transmission rolling mill is as follows: power is input through the long shaft 4 to drive the upper roller 15 to rotate, and then the short shafts 6 are driven to rotate through the two pairs of bevel gears 7 respectively, so that the lower two rollers 15 are driven to synchronously rotate with the upper roller 15, and rolling of rolled pieces is realized through the roller pass.

The effect of the small memorial archway 1 is as follows: the three rollers 15 are distributed at 120 degrees on the circumference, and a rolled piece channel surrounded by the rolling channels is called a pass of the rollers. The size of the hole pattern can be normally produced only by strict adjustment before production, so that a small memorial archway 1 is arranged. The hole shape is adjusted by adopting a metal pad between the contact end surfaces of the small housing 1 and the frame 5, and the adjusted hole shape is tightly pressed by 4 nuts. The small housing 1 cannot adjust the hole pattern on line.

An emulsion passage: the emulsion enters the upper emulsion chamber 18 from above the frame 5 to lubricate and cool the upper roll 15. The lower two rolls 15 are also lubricated and cooled by the impact and the weight of the emulsion. The emulsion cavity is inverted "Y" shaped and leads directly out of the housing 5. The emulsion flows out of the emulsion chamber 18 and then into the emulsion station to achieve circulating lubrication and cooling.

A lubricating oil passage: lubricating oil enters from the upper left of the frame 5 and is divided into three paths: one path lubricates a cylindrical roller bearing at the leftmost end of the long shaft 4; one way lubricates the bevel gear 7; one path of the oil enters the peripheral space of the inner spacer 12 through the left tapered roller bearing 9, then sequentially passes through the small hole 151 on the left of the roller 15, the axial groove 152 (in the roller) and the small hole 151 on the right of the roller 15 to reach the peripheral space of the right inner spacer 12, and finally flows into the right oil cavity 17 through the right tapered roller bearing 9. The two paths of lubricating oil on the right oil cavity also lubricate a conical gear 7 and a conical roller bearing 9 on the right side of the rolling mill. The lubricating oil of the left oil chamber 16 and the right oil chamber 17 can communicate with each other. This communication plays a substantial role in the lubrication of the two sets of stub shafts 4, conical gears 7 and tapered roller bearings 9 below the mill. Lubricating oil in the left oil chamber 16 and the right oil chamber 17 enters the peripheral space of the inner spacer 12 through the tapered roller bearings 9 on the short shafts 4 on two sides of the rolling mill, then sequentially enters the small holes 151, the grooves 152 and the small holes 151 to the peripheral space of the inner spacer 12 below, and finally enters the tapered roller bearings 9 below the short shafts 4 and enters the oil return chamber 19. Then flows into a lubricating oil pump station through an oil return port to realize circulating lubrication.

The problems of the upper-drive three-roller rolling mill are as follows: the lubricating oil path and the emulsion channel are separated by two framework type rubber oil seals. This separation has two problems:

1) the pressure born by the framework type rubber oil seal is limited, the sealing can not be completely achieved, and a lubricating oil channel and an emulsion channel can not be completely separated;

2) once the seal face of the part wears to form a groove, the sealing performance is greatly compromised. The sealing surfaces here are the bearing sleeve outer circumferential surface and the roll small outer circumferential surface. The roller is made of alloy material, so the price is high and the service life of the pass is short. In order to reduce the use cost, the roller is re-routed (hole type is changed) when the pass service life is over, namely, one roller can be used for multiple times. But the sealing surface of the roll is substantially lost.

Due to the above-mentioned problem of mixing oil (lubricating oil) and water (emulsion), the mixed liquid is often handled. Not only increases the production cost, but also brings environmental pollution.

In decades of use, all rolling mills are lubricated by emulsion, namely, the lubricating oil at the upper left of the stand is replaced by the emulsion. This brings about the following problems:

1) the lubricating performance of the emulsion is far inferior to that of the lubricating oil, and the emulsion contains more impurities, such as copper oxide, aluminum oxide, small blocks of aluminum and copper, which are removed by the users in an attempt to remove the impurities, but are not cleaned. This significantly reduces the life of mechanical parts such as bearings, gears, etc. According to the principle, the wearing parts of the rolling mill mainly comprise the roller, almost all parts are wearing parts, and the wearing parts and the roller are equally divided into autumn colors, so that the production cost is increased.

2) And poses a serious threat to the bearings in the rolling mill. The impurities in the emulsion not only have serious influence on the service life of the bearing, but also cause the bearing to be locked and locked or the bearing to be damaged, and the accident often happens. When the condition occurs, the rolling mill stops rotating, blocks rods and flies, and the personal safety of staff is greatly threatened (because the rod outlet speed is high). The whole set of rolling mill stops running, the rolling shear at the front end is started to shear the continuously cast spindle, and rolled pieces in more than ten rolling mills in the production line are still taken out, so that the labor and the foot are disturbed. At the moment, the water outlet of the furnace needs to be blocked, the casting machine continues to perform rapid casting, water (liquid metal) in a casting ladle is cast all the time, and then the water (liquid metal) is cut into short spindles through rolling shear for next furnace return, so that the energy consumption and metal burning loss are increased. This would seriously affect normal production, while maintaining the furnace temperature, i.e. the temperature of the casting water, since normal production is not resumed for a short time.

The structure of the existing lower transmission three-roller mill is shown in figure 3, and the structure is different from the upper transmission three-roller mill in that the long axis is arranged at the lower part, the two short axes are arranged at the upper part, the flowing direction of lubricating oil and emulsion in the structure is opposite to the flowing direction in the upper transmission three-roller mill, but the lubricating oil path and the emulsion channel are in the same structural form, and the problem of oil-water mixing also exists.

SUMMERY OF THE UTILITY MODEL

To the technical problem, the utility model aims at providing a three high rolling mill of profit complete separation solves a series of problems that current three high rolling mill exists because of the profit can mix and lead to.

The utility model provides a technical scheme as follows:

a three-roller rolling mill with completely separated oil and water comprises a rolling mill case, a long shaft and two short shafts, wherein the long shaft and the two short shafts are horizontally arranged in the rolling mill case, the long shaft is driven by a bevel gear, a cylindrical roller bearing is arranged at the input end of the long shaft, the long shaft and the short shafts are respectively arranged in the rolling mill case through a tapered roller bearing and a bearing seat sleeve at two ends, a roller is respectively arranged in the middle of each of the three shafts, the three rollers are Y-shaped and form a Y-shaped emulsion cavity with the rolling mill case, the end part of the bearing seat sleeve is embedded in the roller, a framework type rubber oil seal II is arranged between the outer contact surface of the bearing seat sleeve and the roller, the inner end surface of the bevel gear is tightly abutted against the outer end surface of an inner ring of the tapered roller bearing, a seal sleeve is further arranged at one end of the inner end surface of the inner ring of the tapered roller bearing seat sleeve, the framework type rubber oil seal I is close to the inner end face of the tapered roller bearing, and the framework type rubber oil seal III corresponds to the framework type rubber oil seal II in the roller.

Compare with current three-high mill, the utility model discloses technical scheme has beneficial effect be:

1. the original outer spacer ring and inner spacer ring are replaced by a sealing sleeve with a longer length, and the outer circular surface at one end of the sealing sleeve replaces a roller to be in contact with the framework type rubber oil seal III.

2. And a framework type rubber oil seal I is arranged between the bearing seat sleeve and the sealing sleeve, so that the isolation effect between the lubricating oil and the emulsion is further enhanced.

3. When the three-high mill works, the quick-wear part is a sealing sleeve, the sealing sleeve adopts heat treatment to increase the wear resistance, the structure is simple, and the manufacturing cost and the replacement cost are both very low.

The first parallel optimization is performed on the technical scheme, the long shaft is arranged above the rolling mill, the two short shafts are arranged below the rolling mill, the emulsion liquid inlet hole is formed in the top of the rolling mill box right above the roller on the long shaft, the lubricating oil inlet hole is formed in the top of the rolling mill box, the lubricating oil is respectively guided to the cylindrical roller bearing, the conical gear and the conical roller bearing on the lubricating long shaft for lubrication, and the oil cavity for returning oil is formed in the bottom of the rolling mill box. The preferred scheme is to arrange the long shaft at the upper part and the short shaft at the lower part, and is actually an improved upper-transmission three-roller mill. Preferably, an oil distribution disc is arranged at the lubricating oil inlet hole on the left side of the top of the rolling mill box, the lubricating oil is divided into three paths by the oil distribution disc, one path of lubricating oil is guided to the cylindrical roller bearing on the left side of the long shaft, the other path of lubricating oil is guided to the conical gear and the conical roller bearing on the left side of the long shaft, and the other path of lubricating oil is guided to the conical gear and the conical roller bearing on the right.

The second parallel optimization is performed on the technical scheme, the long shaft is arranged below the two short shafts, the upper part of the rolling mill box is provided with a lubricating oil inlet hole and guides the lubricating oil to the tapered roller bearings on the two short shafts for lubrication, a left oil cavity and a right oil cavity for oil return are formed below the long shaft at the lower part of the rolling mill box, and emulsion liquid inlet holes are formed in emulsion cavities at the side part of the rolling mill box corresponding to the peripheries of the rollers on the two short shafts. In the preferred scheme, the long shaft is arranged at the lower part, and the short shaft is arranged at the upper part, so that the improved lower-transmission three-roll mill is actually an improved lower-transmission three-roll mill.

Preferably, an O-shaped rubber sealing ring is arranged between the outer surface of the bearing sleeve and the rolling mill box. The contact surface between this preferred scheme to bearing housing and the rolling mill case is further sealed, has further strengthened the oil-water separation effect.

Preferably, the two parallel preferred technical schemes are further that the bottom of a cavity position where the two bearing seats on the long shaft are sleeved between the tapered roller bearing and the first framework type rubber oil seal is provided with a lubricating oil hole for guiding lubricating oil seeped into the cavity, the bottom of a cavity position where the axial groove and the first annular groove are arranged on the rolling mill case is provided with the tapered roller bearing for guiding the lubricating oil onto the short shaft, and the bottom of a cavity position where the bearing seats on the long shaft are sleeved between the third framework type rubber oil seal and the first framework type rubber oil seal is provided with an emulsion hole for guiding emulsion seeped into the cavity. According to the optimal scheme, the lubricating oil holes and the emulsion holes are formed, so that even under the condition that the sealing effect is weakened due to abrasion of the framework type rubber oil seal II and the framework type rubber oil seal III, the lubricating oil and the emulsion can still be led out to respective normal circulation channels respectively.

The two parallel optimized technical schemes are further optimized, holes are formed in the cavity between the tapered roller bearing and the framework type rubber oil seal for the two seal sleeves on the short shaft, lubricating oil in the cavity is guided to the seal sleeve annular grooves in the inner surfaces of the seal sleeves, and the short shaft inner oil holes are formed in the short shaft to communicate the seal sleeve annular grooves in the inner surfaces of the two seal sleeves on the same short shaft. The optimized scheme changes the technical means of conveying lubricating oil on the original three-roller mill, and the lubricating oil is communicated with the conical roller bearings at the two ends of the short shaft by the aid of the interior of the short shaft, so that the lubricating oil is further prevented from being mixed with emulsion, and the oil-water separation effect is guaranteed.

Drawings

Fig. 1 is a front sectional view of a conventional upper drive three-roll mill.

Fig. 2 is a partially enlarged view of fig. 1.

Fig. 3 is a front sectional view of a conventional under-drive three roll mill.

Fig. 4 is a front sectional view of the upper drive three-roll mill of the present invention.

Fig. 5 is a partially enlarged view of fig. 4.

Fig. 6 is a front sectional view of the lower three-high mill of the present invention.

Fig. 7 is a partially enlarged view of fig. 6.

Labeled in fig. 1, 2: 1 is a small memorial archway, 2 is an O-shaped rubber sealing ring, 3 is a rubber block, 4 is a long shaft, 5 is a frame, 6 is a short shaft, 7 is a bevel gear, 8 is an O-shaped rubber sealing strip, 9 is a tapered roller bearing, 10 is an outer spacing ring, 11 is a bearing seat sleeve, 12 is an inner spacing ring, and 13 and 14 are framework type rubber oil seals; roll 15, left oil chamber 16, right oil chamber 17, emulsion chamber 18, return oil chamber 19, orifice 151, and axial groove 152.

Labeled in fig. 4, 5: the device comprises a long shaft 1, a rolling mill case 2, a short shaft 3, a bevel gear 4, a tapered roller bearing 5, a sealing sleeve 6, a framework type rubber oil seal I7, an O-shaped rubber sealing ring 8, a bearing sleeve 9, a framework type rubber oil seal II 10, a framework type rubber oil seal III 11, a roller 12, a lubricating oil hole 13, an emulsion hole 14, an annular groove 15, an axial groove 16, a sealing sleeve annular groove 17, a short shaft inner oil hole 18, an oil distributing disc 19, a left oil cavity 20, an emulsion cavity 21, a right oil cavity 22 and an oil cavity 23.

Detailed Description

Example 1:

a three-roller rolling mill with completely separated oil and water is shown in figures 4 and 5 and comprises a rolling mill case 2, a long shaft 1 and two short shafts 3 driven by the long shaft 1 through a bevel gear 4 are horizontally arranged in the rolling mill case, the input end of the long shaft 1 is provided with a cylindrical roller bearing, the long shaft 1 and the short shafts 3 are respectively arranged in the rolling mill case 2 through tapered roller bearings 5 and bearing seat sleeves 9 at two ends, the middle parts of the three shafts are respectively provided with a roller 12, the three rollers 12 are inverted Y-shaped and form an inverted Y-shaped emulsion cavity 21 with the rolling mill case 2, the end part of the bearing seat sleeve 9 is embedded in the roller 12, a framework type rubber oil seal secondary 10 is arranged between the outer contact surface of the bearing seat sleeve 9 and the roller 12, the inner end surface of the bevel gear 4 is tightly abutted against the outer end surface of an inner ring of the tapered roller bearing 5, the rolling mill further comprises a seal 6, one end of, the other end of the framework type rubber oil seal is embedded in a roller 12, a framework type rubber oil seal I7 and a framework type rubber oil seal III 11 are further installed between the seal sleeve 6 and the bearing seat sleeve 9, the framework type rubber oil seal I7 is close to the inner end face of the tapered roller bearing 5, and the framework type rubber oil seal III 11 corresponds to the framework type rubber oil seal II 10 in the roller 12.

The long shaft 1 is arranged above the long shaft 1, the two short shafts 3 are arranged below the long shaft, an emulsion liquid inlet hole is formed in the top of the rolling mill case 2 right above a roller 12 on the long shaft 1, a lubricating oil inlet hole is formed in the top of the rolling mill case 2, lubricating oil is respectively introduced to a cylindrical roller bearing, a conical gear 4 and a conical roller bearing 5 on the lubricating long shaft 1 for lubrication, and an oil cavity 23 for returning oil is formed in the bottom of the rolling mill case 2. The scheme is characterized in that the long shaft is arranged on the upper part, and the short shaft is arranged on the lower part, and the scheme is actually an improved upper-transmission three-roller mill. An oil distribution disc 19 is arranged at the left lubricating oil inlet hole in the top of the rolling mill case 2, the lubricating oil is divided into three paths by the oil distribution disc 19, one path of lubricating oil is guided to the left cylindrical roller bearing on the long shaft 1, the other path of lubricating oil is guided to the tapered gear 4 and the tapered roller bearing 5 on the left of the long shaft 1, and the other path of lubricating oil is guided to the tapered gear 4 and the tapered roller bearing 5 on the right of the long shaft 1.

An O-shaped rubber sealing ring 8 is arranged between the outer surface of the bearing sleeve 9 and the rolling mill box 2.

Two bearing seat sleeves 9 on the long shaft 1 are provided with lubricating oil holes 13 for leading lubricating oil in the cavity out at the bottom of the cavity between the tapered roller bearing 5 and the framework type rubber oil seal I7, an annular groove 15 and an axial groove 16 are arranged on the rolling mill box 2 for leading the lubricating oil to the tapered roller bearing 5 on the short shaft 3, and the bearing seat sleeves 9 on the long shaft 1 are provided with emulsion holes 14 for leading emulsion seeped into the cavity out at the bottom of the cavity between the framework type rubber oil seal III 11 and the framework type rubber oil seal I7.

Two seal sleeves 6 on the short shaft 3 are provided with holes at the position of a cavity between the tapered roller bearing 5 and the framework type rubber oil seal 7 to lead lubricating oil in the cavity out to seal sleeve annular grooves 17 on the inner surfaces of the seal sleeves 6, and a short shaft inner oil hole 18 is arranged in the short shaft 3 to communicate the seal sleeve annular grooves 17 on the inner surfaces of the two seal sleeves 6 on the same short shaft 3.

Example 2:

the embodiment has the long shaft arranged at the lower part and the short shaft arranged at the upper part, and is actually a modified lower-transmission three-high mill, as shown in figures 6 and 7. The components corresponding to the respective marks are the same as those in embodiment 1, and reference may be made to fig. 4 and 5 of embodiment 1.

A three-roller rolling mill capable of completely separating oil from water comprises a rolling mill case 2, a long shaft 1 and two short shafts 3 driven by the long shaft 1 through a bevel gear 4 are horizontally arranged in the rolling mill case, a cylindrical roller bearing is arranged at the input end of the long shaft 1, the long shaft 1 and the short shafts 3 are respectively arranged in the rolling mill case 2 through tapered roller bearings 5 and bearing seat sleeves 9 at two ends, a roller 12 is respectively arranged in the middle of each of the three shafts, the three rollers 12 are Y-shaped and form a Y-shaped emulsion cavity 21 with the rolling mill case 2, the end parts of the bearing seat sleeves 9 are embedded in the rollers 12, a framework type rubber oil seal secondary 10 is arranged between the outer contact surface of the bearing seat sleeves 9 and the rollers 12, the inner end surface of the bevel gear 4 is abutted against the outer end surface of an inner ring of the tapered roller bearing 5, a seal sleeve 6 is further arranged, one end of the seal sleeve 6 is abutted against the inner, a framework type rubber oil seal I7 and a framework type rubber oil seal III 11 are further arranged between the seal sleeve 6 and the bearing seat sleeve 9, the framework type rubber oil seal I7 is close to the inner end face of the tapered roller bearing 5, and the framework type rubber oil seal III 11 corresponds to the framework type rubber oil seal II 10 in the roller 12. The long shaft 1 is arranged below the short shafts 3, the upper part of the mill case 2 is provided with a lubricating oil inlet hole and guides the lubricating oil to the tapered roller bearings 5 on the short shafts 3 for lubrication, a left oil cavity 20 and a right oil cavity 22 for oil return are formed below the long shaft 1 at the lower part of the mill case 2, and emulsion liquid inlet holes are formed in emulsion cavities 21 at the side part of the mill case 2 corresponding to the peripheries of the rollers 12 on the short shafts 3.

Claims

1. The utility model provides a three-high mill of water oil complete separation, includes mill machine case (2), and the incasement level sets up two minor axis (3) that major axis (1) and major axis (1) drive through bevel gear (4), major axis (1) input sets up cylindrical roller bearing, major axis (1) and minor axis (3) are installed in mill machine case (2) through tapered roller bearing (5) and bearing housing (9) at both ends respectively, and three axle middle part sets up one roll (12) respectively, and three roll (12) are the Y type and form Y type emulsion chamber (21) between mill machine case (2), embedded the setting in roll (12) of bearing housing (9) tip, installation skeleton formula rubber oil seals two (10) between bearing housing (9) external contact surface and roll (12), its characterized in that: the inner end face of the bevel gear (4) is tightly abutted to the outer end face of the inner ring of the tapered roller bearing (5), the bevel gear further comprises a sealing sleeve (6), one end of the sealing sleeve (6) is tightly abutted to the inner end face of the inner ring of the tapered roller bearing (5), the other end of the sealing sleeve is embedded into the roller (12), a framework type rubber oil seal I (7) and a framework type rubber oil seal III (11) are further installed between the sealing sleeve (6) and the bearing sleeve (9), the framework type rubber oil seal I (7) is close to the inner end face of the tapered roller bearing (5), and the framework type rubber oil seal III (11) corresponds to the framework type rubber oil seal II (10) in the roller (12).

2. The three-high mill capable of completely separating oil from water according to claim 1, wherein: the long shaft (1) is arranged above the rolling mill, the two short shafts (3) are arranged below the rolling mill, an emulsion liquid inlet hole is formed in the top of the rolling mill case (2) right above a roller (12) on the long shaft (1), a lubricating oil inlet hole is formed in the top of the rolling mill case (2), lubricating oil is respectively introduced to a cylindrical roller bearing, a conical gear (4) and a conical roller bearing (5) on the lubricating long shaft (1) for lubrication, and an oil cavity (23) for returning oil is formed in the bottom of the rolling mill case (2).

3. The three-high mill capable of completely separating oil from water as claimed in claim 2, wherein: an oil distribution disc (19) is arranged at a lubricating oil inlet hole on the left side of the top of the rolling mill case (2), the lubricating oil is divided into three paths by the oil distribution disc (19), the lubricating oil is led to a cylindrical roller bearing on the left side of the long shaft (1), one path of the lubricating oil lubricates a conical gear (4) and a conical roller bearing (5) on the left side of the long shaft (1), and the other path of the lubricating oil lubricates a conical gear (4) and a conical roller bearing (5) on the right side of the.

4. The three-high mill capable of completely separating oil from water according to claim 1, wherein: the oil-return device is characterized in that the long shaft (1) is arranged below the two short shafts (3), the upper part of the mill case (2) is provided with a lubricating oil inlet hole and guides lubricating oil to the tapered roller bearings (5) on the two short shafts (3) for lubrication, a left oil cavity (20) and a right oil cavity (22) for oil return are formed below the long shaft (1) at the lower part of the mill case (2), and emulsion liquid inlet holes are formed in emulsion cavities (21) on the side part of the mill case (2) corresponding to the peripheries of the rollers (12) on the two short shafts (3).

5. The three high mill for complete separation of oil from water according to claim 2 or 4, characterized in that: an O-shaped rubber sealing ring (8) is arranged between the outer surface of the bearing sleeve (9) and the rolling mill box (2).

6. The three high mill for complete separation of oil from water according to claim 2 or 4, characterized in that: two bearing seat sleeves (9) on the long shaft (1) are provided with lubricating oil holes (13) for leading out lubricating oil seeped into the cavities at the bottom of the cavity between the tapered roller bearing (5) and the framework type rubber oil seal I (7), an annular groove (15) and an axial groove (16) are arranged on the rolling mill box (2) for leading the lubricating oil to the tapered roller bearing (5) on the short shaft (3), and an emulsion hole (14) for leading out emulsion seeped into the cavities is arranged at the bottom of the cavity between the framework type rubber oil seal III (11) and the framework type rubber oil seal I (7) on the bearing seat sleeve (9) on the long shaft (1).

7. The three high mill for complete separation of oil from water according to claim 2 or 4, characterized in that: two seal sleeves (6) on the short shaft (3) are provided with holes at the position of a cavity between the tapered roller bearing (5) and the framework type rubber oil seal I (7) to lead lubricating oil in the cavity out to seal sleeve annular grooves (17) on the inner surfaces of the seal sleeves (6), and a short shaft inner oil hole (18) is arranged in the short shaft (3) to communicate the seal sleeve annular grooves (17) on the inner surfaces of the two seal sleeves (6) on the same short shaft (3).