Built-in cooling water jacket pinch roll for hot rolled steel strip coiling furnace front pinch device

Abstract

The utility model discloses a pinch roll with a built-in cooling water jacket for a pinch device in front of a hot rolled steel strip coiling furnace. The pinch roll comprises a roll body, a rotating joint, a shunting joint, a water pipe, a left rotating shaft, a right rotating shaft, a plug, a left sealing plate, a left partition plate, a right partition plate and a right sealing plate, the roller is characterized in that an inner boss is arranged on the inner wall of the middle of the roller body, and an inner cavity of the roller body is divided into a left cooling cavity, a middle cooling cavity and a right cooling cavity; a left partition plate, a left sleeve and a left sleeve fixing plate are arranged in the left cooling cavity, and the left sleeve is arranged on the outer side of the left rotating shaft in a sleeving mode; a right partition plate, a right sleeve and a right sleeve fixing plate are arranged in the right cooling cavity, and the right sleeve is arranged on the outer side of the right rotating shaft in a sleeving mode; a central sleeve is arranged in the middle cooling cavity, and the two ends of the central sleeve are fixedly connected with the left partition plate and the right partition plate respectively; side flow holes are formed in the peripheral walls of the left partition plate and the right partition plate. According to the utility model, cooling water forms a flowing cooling water jacket in the roller body cavity, so that the cooling effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to an improvement of hot-rolled steel strip coiling furnace front pinch roll device belongs to the production technical field of hot-rolled steel strip in metallurgical industry, specifically speaking, it is a kind of hot-rolled steel strip coiling furnace front pinch roll device with built-in cooling water jacket pinch roll. BACKGROUND

[0002] In the metallurgical industry, the present hot-rolled steel strip production process, heated slab after rough rolling mill, through the hot-rolled steel strip coiling furnace front pinch roll into the hot-rolled steel strip coiling furnace reheating, again through the roller to the finishing mill rolling into finished products, finally through the coiling machine coiling. This hot-rolled steel strip coiling furnace front pinch roll device working temperature is 500-700℃, it is composed of frame, drive device, circulating water cooling device and upper and lower pinch roll, two pinch roll is installed on the frame, hot-rolled steel strip from the two pinch roll between, drive device connection drive pinch roll rotation, circulating water cooling device through the water pipe and the rotating joint of pinch roll inlet and outlet connection; The pinch roll, by the roller body, rotating joint, shunt connector, water pipe, left shaft, right shaft, plug, left sealing plate, left partition, right partition and right sealing plate, the inner cavity of the roller body is smooth cylindrical cavity, the inner end of the left shaft is fixedly provided with the left partition, the inner end of the right shaft is fixedly provided with the right partition, the outer diameter of the left partition and the right partition is same with the inner cavity diameter of the roller body, the left partition and the right partition are arranged in the roller body cavity, the left end port of the roller body is sealed and fixedly connected with the middle part of the outer wall of the left shaft through the left sealing plate, the right end port of the roller body is sealed and fixedly connected with the middle part of the outer wall of the right shaft through the right sealing plate; The outer end of the left shaft is provided with a rotating joint, the rotating joint is provided with an inlet and an outlet; The roller body cavity is provided with a water pipe, the left end of the water pipe is inserted into the left shaft inner cavity of the left shaft, the right end of the water pipe is inserted into the right shaft inner cavity of the right shaft; The left shaft inner cavity of the left shaft outer end is provided with a shunt connector, the diameter of the insertion cavity of the shunt connector is same with the outer wall diameter of the water pipe, the outer wall diameter of the shunt connector is same with the left shaft inner cavity diameter of the left shaft, the left end of the water pipe is sealingly inserted and fixed with the insertion cavity of the shunt connector, the inner end of the inlet of the rotating joint is inserted into the insertion cavity of the shunt connector, the outer wall of the inlet of the rotating joint is clearance fit with the inner wall of the insertion cavity of the shunt connector, and an O-shaped sealing ring is arranged for sealing, so that the inlet of the rotating joint is communicated with the water pipe, and water inlet work is realized; The right end of the right shaft is fixedly provided with a plug through bolts, the right end of the water pipe is sealingly connected with the plug, the right end of the water pipe is provided with a water hole, and the right shaft inner cavity diameter of the right shaft is greater than the outer wall diameter of the water pipe; The circumferential wall of the left partition and the right partition is provided with a side flow hole; In use, the cooling water flows into the inlet of the rotating joint, enters the water pipe cavity through the insertion cavity of the shunt connector, flows out from the water hole of the right end of the water pipe, flows into the inner cavity of the roller body from the inner end of the right shaft inner cavity, and flows to the two end portions of the roller body from the side flow holes of the left partition and the right partition respectively, so that the roller body is cooled. Since the roller body is rotating, the dynamic water level in the roller body cavity reaches the inner end of the left shaft inner cavity of the left shaft, and the water flows into the left shaft inner cavity of the left shaft, and then flows into the return groove of the shunt connector and then flows into the return joint cavity of the rotating joint and is discharged.The disadvantage of the pinch roll is that: the inner cavity of the roll body is large, the stored cooling water is more, the energy consumption for driving the pinch roll to rotate is large; and the cooling water in the cavity of the roll body can only cool the middle and lower part of the roll body, the bottom of the pinch roll installed on the upper part directly contacts with the hot rolled steel strip, the cooling effect is good, but the top of the pinch roll installed on the lower part directly contacts with the hot rolled steel strip, the cooling effect is poor. SUMMARY

[0003] The utility model discloses a kind of make cooling water in roll body cavity form a flowing cooling jacket, increase the contact surface of cooling water and roll body side wall, improve the cooling effect of hot rolled steel strip coiling furnace front pinch roll device with built-in cooling jacket pinch roll.

[0004] In order to achieve the above object, the utility model employs the technical scheme that: the hot rolled steel strip coiling furnace front pinch roll device with built-in cooling jacket pinch roll, including roll body, swivel joint, shunt joint, water pipe, left side rotary shaft, right side rotary shaft, plug, left side sealing plate, left partition, right partition and right side sealing plate;The swivel joint is equipped with water inlet connector and backwater connector in;The outer wall of the shunt joint is equipped with backflow groove, and the middle part of the shunt joint is inserted cavity;

[0005] The left side rotary shaft is equipped with left side rotary shaft inner cavity in, and the inner end of the left side rotary shaft is fixedly provided with left partition;The left end of the roll body is connected and sealed with the middle part of the outer wall of the left side rotary shaft by left side sealing plate, and the outer end of the left side rotary shaft is equipped with swivel joint;

[0006] The right side rotary shaft is equipped with right side rotary shaft inner cavity in, and the inner end of the right side rotary shaft is fixedly provided with right partition;The right end of the roll body is connected and sealed with the middle part of the outer wall of the right side rotary shaft by right side sealing plate;

[0007] The roll body cavity is equipped with water pipe, and the left end of the water pipe is inserted into the left side rotary shaft inner cavity of the left side rotary shaft;The left side rotary shaft inner cavity of the outer end of the left side rotary shaft is equipped with shunt joint, the diameter of the inserted cavity of the shunt joint is same with the outer wall diameter of the water pipe, the outer wall diameter of the shunt joint is same with the left side rotary shaft inner cavity diameter of the left side rotary shaft, the left end of the water pipe is sealed and inserted fixed with the inserted cavity of the shunt joint, the inner end of the water inlet connector of the swivel joint is inserted into the inserted cavity of the shunt joint, and the outer wall of the water inlet connector of the swivel joint is gap matched with the inner wall of the inserted cavity of the shunt joint;

[0008] The right end of the right side rotary shaft is equipped with plug fixing groove, and the plug is fixedly arranged in the plug fixing groove of the right side rotary shaft by bolt, the right end of the water pipe is sealed and connected with the plug, the right end of the water pipe is equipped with water hole on the side wall, and the right side rotary shaft inner cavity diameter of the right side rotary shaft is greater than the outer wall diameter of the water pipe;Its characterized in that:

[0009] The inner wall of the middle part of the roller body is provided with an inner boss, the inner cavity of the roller body on the left side of the inner boss is a left cooling cavity, the inner cavity of the roller body inside the inner boss is a middle cooling cavity, and the inner cavity of the roller body on the right side of the inner boss is a right cooling cavity.

[0010] The left cooling cavity is provided with a left partition plate, a left sleeve and a left sleeve fixing plate.

[0011] The right cooling cavity is provided with a right partition plate, a right sleeve and a right sleeve fixing plate.

[0012] The middle cooling cavity is provided with a center sleeve, and the two ends of the center sleeve are fixedly connected with the left partition plate and the right partition plate.

[0013] The left end of the water pipe is fixedly provided with a sealing device between the left end and the side wall of the left shaft inner cavity of the left shaft.

[0014] The sealing device is composed of two sealing rings and a sealing ring.

[0015] The left partition plate and the right partition plate are both composed of a partition plate body, an inner boss and an outer boss.

[0016] The inner end of the left sleeve is sleeved on the outer convex ring table of the left partition plate, the inner end of the right sleeve is sleeved on the outer convex ring table of the right partition plate, and the two ends of the center sleeve are respectively sleeved on the inner convex ring tables of the left partition plate and the right partition plate.

[0017] The water pipe is provided with two rows of through water holes, and each row is uniformly provided with four through water holes.

[0018] The side flow hole is provided with 4-6 side flow holes, which are uniformly distributed on the peripheral wall of the partition plate body.

[0019] The water inlet hole is provided with 4 water inlet holes, which are uniformly distributed on the peripheral wall of the left rotating shaft, and the water outlet hole is provided with 4 water outlet holes, which are uniformly distributed on the peripheral wall of the right rotating shaft.

[0020] The beneficial effect of the utility model lies in that the cooling water forms a flowing cooling water jacket in the roller cavity, increases the contact surface of the cooling water and the roller side wall, and improves the cooling effect. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the structure section view schematic drawing of the utility model;

[0022] Figure 2 It is the structure section view enlarged schematic drawing of the utility model's rotary joint;

[0023] Figure 3 It is the structure section view enlarged schematic drawing of the utility model's shunt joint;

[0024] Figure 4 It is the structure left view enlarged schematic drawing of the utility model's shunt joint;

[0025] Figure 5 It is the structure section view enlarged schematic drawing of the utility model's water pipe;

[0026] Figure 6 It is the structure section view enlarged schematic drawing of the utility model's left partition plate;

[0027] Figure 7 It is the structure left view enlarged schematic drawing of the utility model's left partition plate;

[0028] Figure 8 It is the structure right view enlarged schematic drawing of the utility model's left partition plate;

[0029] Figure 9 It is the structure section view schematic drawing of the utility model's roller;

[0030] Figure 10 It is the structure section view amplification schematic diagram of left side rotating shaft of the utility model;

[0031] Figure 11 It is the structure section view amplification schematic diagram of right side rotating shaft of the utility model.

[0032] In the figure: 1, roller body; 101, inner boss; 102, left side cooling cavity; 103, middle cooling cavity; 104, right side cooling cavity; 2, rotary joint; 201, water inlet joint; 202, backwater joint; 3, shunt joint; 31, plug-in cavity; 32, backflow groove; 4, water pipe; 41, sealing ring; 42, sealing ring; 43, water hole; 5, left side rotating shaft; 51, left side rotating shaft inner cavity; 52, water inlet hole; 6, right side rotating shaft; 61, right side rotating shaft inner cavity; 62, water outlet hole; 63, plug fixing groove; 7, plug; 8, left side sealing plate; 9, left partition plate; 10, right partition plate; 11, right side sealing plate; 12, left side sleeve fixing plate; 13, left side sleeve; 14, right side sleeve fixing plate; 15, right side sleeve; 16, center sleeve; 17, partition plate body; 18, inner boss ring; 19, side flow hole; 20, outer boss ring; 21, center hole. DETAILED DESCRIPTION

[0033] Referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 The utility model is made.

[0034] The hot rolled steel strip coiling furnace front pinch roll device uses built-in cooling water jacket pinch roll, including roller body 1, rotary joint 2, shunt joint 3, water pipe 4, left side rotating shaft 5, right side rotating shaft 6, plug 7, left side sealing plate 8, left partition plate 9, right partition plate 10 and right side sealing plate 11;The rotary joint 2 is equipped with water inlet joint 201 and backwater joint 202 in;The outer wall of shunt joint 3 is equipped with backflow groove 32, and the middle part of shunt joint 3 is plug-in cavity 31;

[0035] The left side rotating shaft 5 is equipped with left side rotating shaft inner cavity 51, and the inner end of left side rotating shaft 5 is fixedly provided with left partition plate 9, and the left end port of roller body 1 is connected and sealed with the middle outer wall of left side rotating shaft 5 through left side sealing plate 8, and the outer end port of left side rotating shaft 5 is equipped with rotary joint 2;

[0036] The right rotating shaft 6 is internally provided with a right rotating shaft inner cavity 61, and the inner end of the right rotating shaft 6 is fixedly provided with a right partition plate 10; the right end of the roller body 1 is sealingly and fixedly connected with the middle outer wall of the right rotating shaft 6 through a right sealing plate 11;

[0037] The roller body 1 is internally provided with a water pipe 4, the left end of the water pipe 4 is inserted into the left rotating shaft inner cavity 51 of the left rotating shaft 5, and the right end of the water pipe 4 is inserted into the right rotating shaft inner cavity 61 of the right rotating shaft 6; the left rotating shaft inner cavity 51 of the outer end of the left rotating shaft 5 is provided with a shunt connector 3, the diameter of the plug-in cavity 31 of the shunt connector 3 is the same as the outer wall diameter of the water pipe 4, the outer wall diameter of the shunt connector 3 is the same as the diameter of the left rotating shaft inner cavity 51 of the left rotating shaft 5, the left end of the water pipe 4 is sealingly and fixedly plugged into the plug-in cavity 51 of the shunt connector 3, the inner end of the water inlet connector 201 of the rotating connector 2 is inserted into the plug-in cavity 31 of the shunt connector 3, and the outer wall of the water inlet connector 201 of the rotating connector 2 is in clearance fit with the inner wall of the plug-in cavity 31 of the shunt connector 3, so that the water inlet connector 201 of the rotating connector 2 is in communication with the water pipe 4, and water inlet work is realized;

[0038] The right end of the right rotating shaft 6 is provided with a plug fixing groove 63, the plug 7 is fixedly arranged in the plug fixing groove 63 of the right rotating shaft 6 through bolts, the right end of the water pipe 4 is sealingly connected with the plug 7, the right end of the water pipe 4 is provided with a water passing hole 43, and the diameter of the right rotating shaft inner cavity 61 of the right rotating shaft 6 is greater than the outer wall diameter of the water pipe 4; characterized in that:

[0039] The middle inner wall of the roller body 1 is provided with an inner boss 101, the roller body 1 inner cavity on the left side of the inner boss 101 is a left cooling cavity 102, the roller body 1 inner cavity inside the inner boss 101 is a middle cooling cavity 103, and the roller body 1 inner cavity on the right side of the inner boss 101 is a right cooling cavity 104;

[0040] The left cooling cavity 102 is internally provided with a left partition plate 9, a left sleeve 13 and a left sleeve fixing plate 12, the left sleeve 13 is sleeved on the outside of the left rotating shaft 5, the inner end of the left sleeve 13 is fixedly connected with the left partition plate 9, the outer end of the left sleeve 13 is fixedly connected with the outer wall of the left rotating shaft 5 through the left sleeve fixing plate 12, the sidewall of the left rotating shaft 5 between the left sleeve fixing plate 12 and the left sealing plate 8 is provided with a water inlet hole 52, and the left rotating shaft inner cavity 51 of the left rotating shaft 5 is in communication with the left cooling cavity 102 outside the left sleeve 13 through the water inlet hole 52;

[0041] The right cooling cavity 104 is internally provided with a right partition plate 10, a right sleeve 15 and a right sleeve fixing plate 14, the right sleeve 15 is sleeved on the outer side of the right rotating shaft 6, the inner end of the right sleeve 15 is fixedly connected with the right partition plate 10, the outer end of the right sleeve 15 is fixedly connected with the outer wall of the right rotating shaft 6 through the right sleeve fixing plate 14, the side wall of the right rotating shaft 6 between the right sleeve fixing plate 14 and the right sealing plate 11 is provided with a water outlet hole 62, the right rotating shaft inner cavity 61 of the right rotating shaft 6 is communicated with the right cooling cavity 104 outside the right sleeve 15 through the water outlet hole 62;

[0042] The middle cooling cavity 103 is internally provided with a center sleeve 16, both ends of the center sleeve 16 are fixedly connected with the left partition plate 9 and the right partition plate 10 respectively, the peripheral wall of the left partition plate 9 and the right partition plate 10 is provided with a side flow hole 19;

[0043] The left end of the water pipe 4 is fixedly provided with a sealing device between the side wall of the left rotating shaft inner cavity 51 of the left rotating shaft 5, the corresponding sealing device of the left rotating shaft 5 is located on the right side of the water inlet hole 52, the right end of the water pipe 4 is also fixedly provided with a sealing device between the side wall of the right rotating shaft inner cavity 61 of the right rotating shaft 6, the corresponding sealing device of the right rotating shaft 6 is located on the left side of the water outlet hole 62.

[0044] The sealing device is composed of two sealing rings 41 and a sealing ring 42, the two sealing rings 41 are fixedly arranged on the outer wall of the water pipe 4, and the sealing ring 42 is sleeved on the outer wall of the water pipe 4 between the two sealing rings 41.

[0045] The left partition plate 9 and the right partition plate 10 are both composed of a partition plate body 17, an inner convex ring table 18 and an outer convex ring table 20, the middle part of the partition plate body 17 is provided with a center hole 21, the peripheral wall of the partition plate body 17 is provided with a side flow hole 19, the outer side wall of the partition plate body 17 is provided with an outer convex ring table 20, and the inner side wall of the partition plate body 17 is provided with an inner convex ring table 18.

[0046] The inner end of the left sleeve 13 is sleeved on the outer convex ring table 20 of the left partition plate 9, the inner end of the right sleeve 15 is sleeved on the outer convex ring table 20 of the right partition plate 10, both ends of the center sleeve 16 are sleeved on the inner convex ring tables 18 of the left partition plate 9 and the right partition plate 10 respectively, the middle cooling cavity 103 outside the center sleeve 16 is communicated with the left cooling cavity 102 outside the left sleeve 13 through the side flow hole 19 of the left partition plate 9, and the middle cooling cavity 103 outside the center sleeve 16 is communicated with the right cooling cavity 104 outside the right sleeve 15 through the side flow hole 19 of the right partition plate 10.

[0047] The water passing hole 43 is provided with two rows on the peripheral wall of the water pipe 4, and each row is uniformly provided with four water passing holes.

[0048] The side flow holes 19 are 4-6 in number and are evenly distributed on the peripheral wall of the baffle body 17.

[0049] The water inlet holes 52 are 4 in number and are evenly distributed on the peripheral wall of the left rotating shaft 5, and the water outlet holes 62 are 4 in number and are evenly distributed on the peripheral wall of the right rotating shaft 6.

[0050] The rotary joint 2 and the flow distribution joint 3 are both prior art, and the connection and installation mode of the rotary joint 2 and the flow distribution joint 3 with the left rotating shaft 5 are also prior art, and the installation mode of the rotary joint 2 and the left rotating shaft 5 on the pinch roll device in front of the hot-rolled steel strip coiling furnace is also prior art.

[0051] In use, cooling water flows into the rotary joint 2 from the water inlet joint 201, enters the water pipe 4 cavity through the insertion cavity 31 of the flow distribution joint 3, flows out from the water passage hole 43 at the right end of the water pipe 4, flows into the right cooling cavity 104 outside the right sleeve pipe 15 from the water outlet hole 62 of the right rotating shaft 6, passes through the side flow holes 19 on the right baffle 10 into the middle cooling cavity 103 outside the central sleeve pipe 16, passes through the side flow holes 19 on the left baffle 9 into the left cooling cavity 102 outside the left sleeve pipe 13, flows into the left rotating shaft cavity 51 from the water inlet hole 52 of the left rotating shaft 5, flows into the water return groove 32 of the flow distribution joint 3, flows into the water return joint 202 of the rotary joint 2, and finally flows back to the circulating water cooling device. Since the pinch roll is rotating during work, and the left sleeve pipe 13, the central sleeve pipe 16 and the right sleeve pipe 15 occupy part of the volume in the roll body 1 cavity, the cooling water can only be stored in the cavity between the outer sides of the left sleeve pipe 13, the central sleeve pipe 16 and the right sleeve pipe 15 and the inner wall of the roll body 1. Under the action of centrifugal force, the cooling water forms a cooling water jacket flowing from the right cooling cavity 104 to the left cooling cavity 102 along the inner wall of the roll body 1, achieving cooling of the inner wall of the roll body 1. Whether the pinch roll is installed above or below, good cooling effect can be ensured.

Claims

1. A built-in cooling water jacket pinch roll for hot-rolled steel strip coiling mill front pinch device, comprising a roll body (1), a rotary joint (2), a shunt joint (3), a water pipe (4), a left shaft (5), a right shaft (6), a plug (7), a left sealing plate (8), a left partition plate (9), a right partition plate (10) and a right sealing plate (11); the rotary joint (2) is internally provided with a water inlet joint (201) and a water return joint (202); the outer wall of the shunt joint (3) is provided with a backflow groove (32), and the middle part of the shunt joint (3) is a plug-in cavity (31); the left shaft (5) is internally provided with a left shaft inner cavity (51), the inner end of the left shaft (5) is fixedly provided with the left partition plate (9), the left end of the roll body (1) is connected and sealingly fixed with the middle outer wall of the left shaft (5) through the left sealing plate (8), and the outer end of the left shaft (5) is provided with the rotary joint (2); the right shaft (6) is internally provided with a right shaft inner cavity (61), the inner end of the right shaft (6) is fixedly provided with the right partition plate (10), and the right end of the roll body (1) is connected and sealingly fixed with the middle outer wall of the right shaft (6) through the right sealing plate (11); the roll body (1) is internally provided with the water pipe (4), the left end of the water pipe (4) is inserted into the left shaft inner cavity (51) of the left shaft (5), and the right end of the water pipe (4) is inserted into the right shaft inner cavity (61) of the right shaft (6); the left shaft inner cavity (51) of the outer end of the left shaft (5) is internally provided with the shunt joint (3), the diameter of the plug-in cavity (31) of the shunt joint (3) is the same as that of the outer wall of the water pipe (4), the diameter of the outer wall of the shunt joint (3) is the same as that of the left shaft inner cavity (51) of the left shaft (5), the left end of the water pipe (4) is sealingly and fixedly plugged into the plug-in cavity (31) of the shunt joint (3), the inner end of the water inlet joint (201) of the rotary joint (2) is inserted into the plug-in cavity (31) of the shunt joint (3), and the outer wall of the water inlet joint (201) of the rotary joint (2) is gap-fitted with the inner wall of the plug-in cavity (31) of the shunt joint (3); the right end of the right shaft (6) is provided with a plug fixing groove (63), the plug (7) is fixedly arranged in the plug fixing groove (63) of the right shaft (6) through bolts, the right end of the water pipe (4) is sealingly connected with the plug (7), the right end of the water pipe (4) is provided with a water passing hole (43), and the diameter of the right shaft inner cavity (61) of the right shaft (6) is greater than that of the outer wall of the water pipe (4); characterized in that: the middle inner wall of the roll body (1) is provided with an inner boss (101), the inner cavity of the roll body (1) on the left side of the inner boss (101) is a left cooling cavity (102), the inner cavity of the roll body (1) inside the inner boss (101) is a middle cooling cavity (103), and the inner cavity of the roll body (1) on the right side of the inner boss (101) is a right cooling cavity (104). The left cooling cavity (102) is internally provided with a left partition plate (9), a left sleeve pipe (13) and a left sleeve pipe fixing plate (12), the left sleeve pipe (13) is sleeved on the outer side of the left rotating shaft (5), the inner end of the left sleeve pipe (13) is fixedly connected with the left partition plate (9), the outer end of the left sleeve pipe (13) is fixedly connected with the outer wall of the left rotating shaft (5) through the left sleeve pipe fixing plate (12), the side wall of the left rotating shaft (5) between the left sleeve pipe fixing plate (12) and the left sealing plate (8) is provided with a water inlet hole (52), and the left rotating shaft inner cavity (51) of the left rotating shaft (5) is communicated with the left cooling cavity (102) outside the left sleeve pipe (13) through the water inlet hole (52); The right cooling cavity (104) is internally provided with a right partition plate (10), a right sleeve pipe (15) and a right sleeve pipe fixing plate (14), the right sleeve pipe (15) is sleeved on the outer side of the right rotating shaft (6), the inner end of the right sleeve pipe (15) is fixedly connected with the right partition plate (10), the outer end of the right sleeve pipe (15) is fixedly connected with the outer wall of the right rotating shaft (6) through the right sleeve pipe fixing plate (14), the side wall of the right rotating shaft (6) between the right sleeve pipe fixing plate (14) and the right sealing plate (11) is provided with a water outlet hole (62), and the right rotating shaft inner cavity (61) of the right rotating shaft (6) is communicated with the right cooling cavity (104) outside the right sleeve pipe (15) through the water outlet hole (62); The middle cooling cavity (103) is internally provided with a center sleeve pipe (16), and the two ends of the center sleeve pipe (16) are fixedly connected with the left partition plate (9) and the right partition plate (10) respectively; the peripheral wall of the left partition plate (9) and the right partition plate (10) is provided with a side flow hole (19); The left end of the water pipe (4) is fixedly provided with a sealing device between the side wall of the left rotating shaft inner cavity (51) of the left rotating shaft (5), and the corresponding sealing device of the left rotating shaft (5) is located at the right side of the water inlet hole (52); the right end of the water pipe (4) is also fixedly provided with a sealing device between the side wall of the right rotating shaft inner cavity (61) of the right rotating shaft (6), and the corresponding sealing device of the right rotating shaft (6) is located at the left side of the water outlet hole (62).

2. The built-in cooling jacketed pinch roll for hot strip mill coiler pre- furnace pinch roll as claimed in claim 1, wherein: The sealing device is composed of two sealing rings (41) and a sealing ring (42), the two sealing rings (41) are fixedly arranged on the outer wall of the water pipe (4), and the sealing ring (42) is sleeved on the outer wall of the water pipe (4) between the two sealing rings (41).

3. The hot strip mill coiler pre- furnace pinch roll with built-in cooling jacket pinch roll as claimed in claim 1 wherein: The left partition plate (9) and the right partition plate (10) are both composed of a partition plate body (17), an inner convex ring table (18) and an outer convex ring table (20), the middle part of the partition plate body (17) is provided with a center hole (21), the peripheral wall of the partition plate body (17) is provided with a side flow hole (19), the outer side wall of the partition plate body (17) is provided with an outer convex ring table (20), and the inner side wall of the partition plate body (17) is provided with an inner convex ring table (18).

4. The hot strip mill coiler pre- furnace pinch roll with built-in cooling jacket pinch roll as claimed in claim 3, wherein: The inner end of the left sleeve (13) is sleeved on the outer convex ring table (20) of the left partition plate (9); the inner end of the right sleeve (15) is sleeved on the outer convex ring table (20) of the right partition plate (10); the two ends of the center sleeve (16) are respectively sleeved on the inner convex ring tables (18) of the left partition plate (9) and the right partition plate (10); the middle cooling cavity (103) outside the center sleeve (16) is connected with the left cooling cavity (102) outside the left sleeve (13) through the side flow hole (19) of the left partition plate (9), and the middle cooling cavity (103) outside the center sleeve (16) is connected with the right cooling cavity (104) outside the right sleeve (15) through the side flow hole (19) of the right partition plate (10).

5. The hot strip mill coiler pre- furnace pinch roll with built-in cooling jacket pinch roll as claimed in claim 1 wherein: The water through hole (43) is provided with two rows on the peripheral wall of the water pipe (4), and each row is uniformly provided with four water through holes.

6. The hot strip mill coiler pre- furnace pinch roll with built-in cooling jacket pinch roll as claimed in claim 3 wherein: The side flow hole (19) is provided with 4-6 side flow holes, which are uniformly distributed on the peripheral wall of the partition plate body (17).

7. The hot strip mill coiler pre-roller with built-in cooling jacket pinch roll as claimed in claim 1 wherein: The water inlet hole (52) is provided with four water inlet holes, which are uniformly distributed on the peripheral wall of the left rotating shaft (5); the water outlet hole (62) is provided with four water outlet holes, which are uniformly distributed on the peripheral wall of the right rotating shaft (6).

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