CN109894477B

CN109894477B - High-precision steel pipe hot rolling equipment

Info

Publication number: CN109894477B
Application number: CN201910192104.XA
Authority: CN
Inventors: 不公告发明人
Original assignee: Ningxia Jinyuan Petroleum Technology Co Ltd
Current assignee: Ningxia Changxin Anti Corrosion Engineering Co ltd; Ningxia Jinyuan Petroleum Technology Co.,Ltd.
Priority date: 2019-03-14
Filing date: 2019-03-14
Publication date: 2020-09-25
Anticipated expiration: 2039-03-14
Also published as: CN109894477A

Abstract

The invention belongs to the technical field of steel pipe shaping, and particularly relates to high-precision steel pipe hot rolling equipment which comprises a rack, a controller and a control panel, wherein the rack is provided with a plurality of guide rails; the fixed disc and the second squeeze roller are sleeved at two ends of the first squeeze roller; the second extrusion roller is sleeved on the surface of the first extrusion roller in a sliding manner; a second double-shaft cylinder is fixedly connected between the second extrusion roller and the adjacent fixed disc; a pressure sensor and a distance sensor are arranged on the surface of the first extrusion roller and between two adjacent second extrusion rollers in the vertical direction; the invention controls the first double-shaft cylinder and the second double-shaft cylinder through the pressure sensor and the distance sensor to realize the movement of the first extrusion roller and the second extrusion roller, thereby adjusting the shaping accuracy of the steel pipe.

Description

High-precision steel pipe hot rolling equipment

Technical Field

The invention belongs to the technical field of steel pipe shaping, and particularly relates to high-precision steel pipe hot rolling equipment.

Background

The development of steel pipe production technology, which starts from the rise of bicycle manufacturing industry, the development of petroleum in the early 19 th century, the manufacture of ships, boilers and airplanes during the two world war, the manufacture of electric-fire boilers after the second world war, the development of chemical industry, the drilling, production and transportation of petroleum and natural gas, and the like, has all powerfully pushed the development of steel pipe industry in variety, yield and quality, and the steel pipe is not only used for conveying fluid and powdery solids, exchanging heat energy, manufacturing mechanical parts and containers, but also is an economic steel material. The steel pipe is used to manufacture building structure net frame, support and mechanical support, and this can reduce weight, save metal by 20-40%, and realize industrial mechanical construction.

The shaping of steel pipe is one of important steps in the production process of steel pipe, and the steel pipe shaping is mainly to make the steel pipe reach the length, width and the height that set for with the steel pipe through the extrusion, guarantees simultaneously to shape the steel pipe to the cuboid, and convenient subsequent processing practices thrift raw and other materials simultaneously.

The steel pipe plastic among the prior art uses the module rotation of different width and height usually, make the steel pipe extrude into the length height and the width of settlement, need the steel pipe to reciprocate to pass through many times at the extrusion in-process, extravagant manpower and materials, the steel pipe need overturn the steel pipe at reciprocating in-process simultaneously, the upset in-process leads to steel pipe plastic postbending easily, the difficulty degree of plastic has been increased, and the immobility of squeeze roll, a pair of squeeze roll only is applicable to the steel pipe plastic of a standard, there is great use restriction when making the steel pipe plastic.

Disclosure of Invention

In order to make up for the defects of the prior art and solve the problems that the steel pipe needs to be repeatedly shaped, manpower and material resources are wasted, the steel pipe needs to be turned during the reciprocating process to cause the bending of the steel pipe, the shaping difficulty is increased, and the steel pipe hot rolling equipment cannot be suitable for shaping different steel pipes.

The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to high-precision steel pipe hot rolling equipment which comprises a rack, a controller and a control panel, wherein the rack is provided with a plurality of guide rails; the control panel is electrically connected with the controller and is used for controlling the hot rolling equipment to work; the frame is in a U-shaped design, and two ends of the frame are fixedly connected with first double-shaft cylinders; both ends of the first double-shaft cylinder are fixedly connected with fixing rods; a first extrusion roller is rotatably connected between the two horizontally opposite fixed rods; the surfaces of the two fixing rods on the left side are fixedly connected with motors respectively, and rotating shafts of the motors penetrate through the fixing rods and are fixedly connected to the left end of the first squeezing roller; the fixed disc and the second squeeze roller are sleeved at two ends of the first squeeze roller; the second squeezing roller is positioned between the two fixed disks; the second extrusion roller is sleeved on the surface of the first extrusion roller in a sliding manner, and the fixed disc is fixedly sleeved on the surface of the first extrusion roller; a second double-shaft cylinder is fixedly connected between the second extrusion roller and the adjacent fixed disc; the first double-shaft cylinder and the second double-shaft cylinder are both communicated with an external air source and are electrically connected with the controller; during operation, through the flexible of first biaxial cylinder of controller control and second biaxial cylinder, thereby control the removal of first squeeze roll and second squeeze roll, thereby width after the control steel pipe plastic, height and length, corotation and the reversal of the steerable motor of controller simultaneously, the corotation and the reversal of accessible motor are realized just reversing when great steel pipe can't carry out disposable shaping work and are realized just reversing of first squeeze roll and second squeeze roll to the repetition plastic of steel pipe, and in the repeated plastic process, first squeeze roll and second squeeze roll pass through controller control and move, realize the gradual plastic of steel pipe, final plastic is to ideal form, the inhomogeneous thorough problem of plastic when gradual plastic can effectively prevent the steel pipe disposable shaping, simultaneously can prevent that first squeeze roll and second squeeze roll atress is too big to lead to the damage.

Preferably, a pressure sensor and a distance sensor are arranged on the surface of the first extrusion roll and between two adjacent second extrusion rolls in the vertical direction; the pressure sensor and the distance sensor are both electrically connected with the controller; during operation, through the displacement distance of first squeeze roll of distance inductor response and second squeeze roll, when the distance that first squeeze roll and second squeeze roll removed is greater than the setting value of control panel input, thereby feed back to pressure sensors and control the pressure of first squeeze roll and second squeeze roll to the steel pipe, when the displacement distance of first squeeze roll and second squeeze roll is less than the setting value of control panel input, feed back to pressure sensors apart from the sensors, improve the pressure of first squeeze roll and second squeeze roll to the steel pipe, thereby accuracy when adjusting the steel pipe plastic, realize the intelligent plastic of steel pipe, guarantee the accuracy of steel pipe plastic.

Preferably, a first extrusion ring is fixedly sleeved on the surface of the second extrusion roller above the first extrusion roller; a second extrusion ring is fixedly sleeved on the surface of the second extrusion roller below the extrusion roller; a first groove is formed in the first extrusion ring, and the second extrusion ring can penetrate into the first groove; during operation, when first squeeze roll was relative and carried on the back mutually and remove, the second squeeze ring slided in first squeeze ring, played good thermal-insulated function, high temperature when preventing the steel pipe plastic influences pressure sensor and distance sensor's work, and steel pipe material gets into the clearance between the second squeeze roll when first squeeze ring and second squeeze ring can prevent the steel pipe plastic simultaneously, leads to the plastic failure, extravagant material.

Preferably, the side faces, close to the fixed disc, of the first extrusion rings are provided with uniformly arranged distance sensors, the distance sensors are electrically connected with the controller, and meanwhile, the controller is electrically connected with an alarm; during operation, in the steel pipe plastic process, through the data that a plurality of distance inductors provided, whether parallel between two second squeeze rollers about the analysis, controller control alarm was reported to the police during nonparallel, overhauls the device, and accessible human eye observes simultaneously whether the protruding size that forms between first squeeze ring and the second squeeze ring equals, prevents through dual fail-safe that first squeeze roller and second squeeze roller from taking place the slope, leads to the steel pipe plastic failure, can lead to the damage of device when serious.

Preferably, the side surfaces of the opposite sides of the second squeezing rollers are provided with circular second grooves; first springs are uniformly arranged in the second groove; the first springs are fixedly connected between the surface of the first extrusion roller and the inner wall of the second groove, and two adjacent first springs are arranged in a contact manner; a first sliding plate is arranged in the second groove in a sliding manner; the first sliding plate is designed in a circular ring shape, and the cambered surface of the first sliding plate is designed, so that a steel pipe can enter between the first sliding plates more conveniently, the first sliding plate is initially arranged in contact with the surface of the first spring, and the middle part of the first sliding plate is parallel to the surface of the second extrusion roller when the first spring is completely contracted to be incapable of deforming; during operation, when the steel pipe inserted and carries out the plastic between first squeeze roll and the second squeeze roll, the first slide that the inclined plane set up can prevent that the steel pipe can't insert, because the second recess can make the interior air current of second squeeze roll flow in the plastic process, can effectively cool down the second squeeze roll, strengthens the life of second squeeze roll.

Preferably, the side surface of the second extrusion roller, which is close to the fixed disc, is provided with uniformly arranged cavities; the cavities are circumferentially arranged by taking the first extrusion roller as a circle center; a second sliding plate is connected in the cavity in a sliding manner; a second spring is fixedly connected between the side surface of the second sliding plate close to the first squeezing roller and the inner wall of the cavity; the space in the cavity above the second sliding plate is communicated with the second groove and the outside; during operation, corotation and the reversal in-process of second squeeze roll make the second slide reciprocate through the effect of centrifugal force that the second slide receives and second spring tension to the air current flows in the second recess of accelerating, makes air current and air exchange in the second recess simultaneously, cools down second squeeze roll and extrusion ring, improve device life.

The invention has the following beneficial effects:

1. according to the high-precision steel pipe hot rolling equipment, the first double-shaft cylinder and the second double-shaft cylinder are arranged, and the controller controls the first double-shaft cylinder and the second double-shaft cylinder to stretch and retract, so that the first extrusion roller and the second extrusion roller are controlled to move, the device is suitable for shaping steel pipes of different standards, and meanwhile, the steel pipes can be shaped step by step, and the device is prevented from being damaged when the steel pipes are not shaped completely.

2. According to the high-precision steel pipe hot rolling equipment, the pressure sensor and the distance sensor are arranged, the accuracy of steel pipe shaping is improved through feedback between the pressure sensor and the distance sensor, meanwhile, when the steel pipe cannot be shaped, the steel pipe can be fed back to the alarm through the distance sensor and the pressure sensor, the device is adjusted, and waste of materials is prevented.

3. According to the high-precision steel pipe hot rolling equipment, the cavity, the first spring, the second groove, the second spring and the second sliding plate are arranged, and air flow in the second groove can flow under the action of centrifugal force and the second spring to effectively cool the second squeeze roll, so that the service life of the device is prolonged.

Drawings

The invention will be further explained with reference to the drawings.

FIG. 1 is a front view of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a cross-sectional view B-B of FIG. 1;

in the figure: the device comprises a frame 1, a first double-shaft cylinder 11, a fixing rod 12, a first squeezing roller 13, a motor 14, a fixing disc 15, a second squeezing roller 16, a second double-shaft cylinder 17, a first squeezing ring 2, a second squeezing ring 21, a first groove 22, a second groove 3, a first spring 31, a first sliding plate 32, a cavity 33, a second sliding plate 34 and a second spring 35.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 3, the high-precision steel pipe hot rolling equipment of the invention comprises a frame 1, a controller and a control panel; the control panel is electrically connected with the controller and is used for controlling the hot rolling equipment to work; the frame 1 is in a U-shaped design, and two ends of the frame 1 are fixedly connected with first double-shaft cylinders 11; both ends of the first double-shaft cylinder 11 are fixedly connected with fixing rods 12; a first squeezing roller 13 is rotatably connected between the two fixed rods 12 which are horizontally opposite; the surfaces of the two fixing rods 12 on the left side are fixedly connected with motors 14 respectively, and rotating shafts of the motors 14 penetrate through the fixing rods 12 and are fixedly connected to the left ends of the first squeezing rollers 13; a fixed disc 15 and a second squeeze roller 16 are sleeved at both ends of the first squeeze roller 13; the second pressing roller 16 is positioned between the two fixed disks 15; the second extrusion roller 16 is sleeved on the surface of the first extrusion roller 13 in a sliding manner, and the fixed disc 15 is fixedly sleeved on the surface of the first extrusion roller 13; a second double-shaft cylinder 17 is fixedly connected between the second extrusion roller 16 and the adjacent fixed disc 15; the first double-shaft cylinder 11 and the second double-shaft cylinder 17 are both communicated with an external air source and are electrically connected with a controller; when in work, the controller controls the expansion and contraction of the first double-shaft cylinder 11 and the second double-shaft cylinder 17, thereby controlling the movement of the first squeeze roll 13 and the second squeeze roll 16, thereby controlling the width, height and length of the shaped steel pipe, meanwhile, the controller can control the forward rotation and the reverse rotation of the motor 14, when the larger steel pipe cannot be formed into work in one-step shaping, the forward rotation and the reverse rotation of the first extrusion roller 13 and the second extrusion roller 16 can be realized through the forward rotation and the reverse rotation of the motor 14, the repeated shaping of the steel pipe is realized, and in the repeated shaping process, the first extrusion roller 13 and the second extrusion roller 16 move under the control of the controller, so that the steel pipe is shaped gradually, and finally shaped to an ideal shape, the problem of uneven and thorough shaping of the steel pipe during one-time shaping can be effectively solved through the gradual shaping, and the first extrusion roller 13 and the second extrusion roller 16 can be prevented from being damaged due to overlarge stress.

As an embodiment of the invention, a pressure sensor and a distance sensor are arranged on the surface of the first extrusion roll 13 and between two adjacent second extrusion rolls 16 in the vertical direction; the pressure sensor and the distance sensor are both electrically connected with the controller; during operation, the moving distance of the first squeeze roll 13 and the second squeeze roll 16 is sensed through the distance sensor, when the moving distance of the first squeeze roll 13 and the second squeeze roll 16 is greater than a set value input by the control panel, the pressure of the first squeeze roll 13 and the second squeeze roll 16 to the steel pipe is controlled by feeding back the pressure sensor, when the moving distance of the first squeeze roll 13 and the second squeeze roll 16 is less than the set value input by the control panel, the pressure sensor is fed back by the distance sensor, the pressure of the first squeeze roll 13 and the second squeeze roll 16 to the steel pipe is improved, the accuracy during steel pipe shaping is adjusted, the intelligent shaping of the steel pipe is realized, and the accuracy of the steel pipe shaping is ensured.

As an embodiment of the present invention, a first extrusion ring 2 is fixedly sleeved on the surface of the upper second extrusion roll 16; a second extrusion ring 21 is fixedly sleeved on the surface of the second extrusion roller 16 below; a first groove 22 is formed in the first extrusion ring 2, and the second extrusion ring 21 can penetrate into the first groove 22; during operation, first squeeze roll 13 is relative and when moving back to back, and second squeeze ring 21 slides in first squeeze ring 2, plays good thermal-insulated function, and high temperature when preventing the steel pipe plastic influences pressure sensor and distance sensor's work, and first squeeze ring 2 and second squeeze ring 21 can prevent that steel pipe material from getting into the clearance between the second squeeze roll 16 when the steel pipe plastic simultaneously, lead to the plastic failure, extravagant material.

As an embodiment of the invention, the side surfaces of the first extrusion rings 2, which are close to the fixed disk 15, are provided with uniformly arranged distance sensors, the distance sensors are electrically connected with a controller, and the controller is electrically connected with an alarm; during operation, in the steel pipe plastic process, through the data that a plurality of distance inductors provided, whether parallel between two second squeeze roll 16 about the analysis, controller control alarm was reported to the police during nonparallel, overhauls the device, accessible human eye observes simultaneously whether the protruding size that forms between first squeeze ring 2 and the second squeeze ring 21 equals, prevents through dual fail-safe that first squeeze roll 13 and second squeeze roll 16 from taking place the slope, leads to the steel pipe plastic failure, can lead to the damage of device when serious.

As an embodiment of the present invention, the side surface of the second squeezing roller 16 opposite to the side surface is provided with a circular second groove 3; first springs 31 are uniformly arranged in the second groove 3; the first springs 31 are fixedly connected between the surface of the first squeezing roller 13 and the inner wall of the second groove 3, and two adjacent first springs 31 are arranged in a contact manner; a first sliding plate 32 is arranged in the second groove 3 in a sliding manner; the first sliding plates 32 are designed in a circular ring shape, and the cambered surfaces of the first sliding plates 32 are designed, so that steel pipes can enter the first sliding plates 32 more conveniently, the first sliding plates 32 are initially arranged in contact with the surfaces of the first springs 31, and when the first springs 31 are completely contracted to be incapable of being deformed, the middle parts of the first sliding plates 32 are parallel to the surfaces of the second extrusion rollers 16; during operation, when the steel pipe inserts and carries out the plastic between first squeeze roll 13 and the second squeeze roll 16, the first slide 32 of inclined plane setting can prevent that the steel pipe can't insert, because the second recess 3 can make the interior air current of second squeeze roll 16 flow in the plastic process, can effectively cool down second squeeze roll 16, reinforcing second squeeze roll 16's life.

As an embodiment of the present invention, the side surface of the second squeezing roller 16 close to the fixed disk 15 is provided with uniformly arranged cavities 33; the cavities 33 are circumferentially arranged by taking the first squeezing rollers 13 as the circle center; a second sliding plate 34 is slidably connected in the cavity 33; a second spring 35 is fixedly connected between the side surface of the second sliding plate 34 close to the first squeezing roller 13 and the inner wall of the cavity 33; the space in the cavity 33 above the second sliding plate 34 is communicated with the second groove 3 and the outside; during operation, the corotation of second squeeze roll 16 and the reversal in-process, through the effect of centrifugal force that second slide 34 receives and second spring 35 pulling force make second slide 34 reciprocate to accelerate the air current flow in the second recess 3, make air current and air exchange in the second recess 3 simultaneously, lower the temperature to second squeeze roll 16 and extrusion ring, improve device life.

When the steel pipe shaping machine works, the controller controls the extension and retraction of the first double-shaft cylinder 11 and the second double-shaft cylinder 17, so that the movement of the first extrusion roller 13 and the second extrusion roller 16 is controlled, the width, the height and the length of a shaped steel pipe are controlled, meanwhile, the controller can control the forward rotation and the reverse rotation of the motor 14, when a large steel pipe cannot be subjected to one-time shaping work, the forward rotation and the reverse rotation of the first extrusion roller 13 and the second extrusion roller 16 can be realized through the forward rotation and the reverse rotation of the motor 14, the repeated shaping of the steel pipe is realized, in the repeated shaping process, the first extrusion roller 13 and the second extrusion roller 16 are controlled to move through the controller, the gradual shaping of the steel pipe is realized, the steel pipe is finally shaped to an ideal shape, in the shaping process, the moving distance between the first extrusion roller 13 and the second extrusion roller 16 is sensed through the distance sensor, and when the moving distance between the first extrusion roller 13 and the second extrusion, the pressure of the first extrusion roller 13 and the second extrusion roller 16 to the steel pipe is fed back to the pressure sensor so as to control the pressure of the first extrusion roller 13 and the second extrusion roller 16 to the steel pipe, when the moving distance of the first extrusion roller 13 and the second extrusion roller 16 is smaller than a set value input by a control panel, the distance sensor feeds back the pressure sensor so as to improve the pressure of the first extrusion roller 13 and the second extrusion roller 16 to the steel pipe so as to adjust the accuracy of the steel pipe shaping, when the first extrusion roller 13 moves relatively and oppositely, the second extrusion ring 21 slides in the first extrusion ring 2, meanwhile, whether the upper and the lower two second extrusion rollers 16 are parallel or not is analyzed through data provided by a plurality of distance sensors, when the first extrusion roller 13 is not parallel, the controller controls an alarm to give an alarm, the device is overhauled, and whether the size of a bulge formed between the first extrusion ring 2 and the second extrusion ring 21 is equal or not can be observed through human eyes so as to, in the forward rotation and reverse rotation processes of the second squeezing roller 16, the second sliding plate 34 is moved up and down by the centrifugal force applied to the second sliding plate 34 and the pulling force of the second spring 35, so that the air flow in the second groove 3 is accelerated, and the air flow in the second groove 3 is exchanged with the air.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A high accuracy steel pipe hot rolling equipment which characterized in that: comprises a frame (1), a controller and a control panel; the controller is electrically connected with the control panel and is used for controlling the hot rolling equipment to work; the frame (1) is designed in a U shape, and two ends of the frame (1) are fixedly connected with a first double-shaft cylinder (11); both ends of the first double-shaft cylinder (11) are fixedly connected with fixing rods (12); a first squeezing roller (13) is rotatably connected between the two fixed rods (12) which are horizontally opposite; the surfaces of the two fixing rods (12) on the left side are fixedly connected with a motor (14) respectively, and a rotating shaft of the motor (14) penetrates through the fixing rods (12) and is fixedly connected to the left end of the first squeezing roller (13); a fixed disc (15) and a second squeeze roller (16) are sleeved at both ends of the first squeeze roller (13); the second squeezing roller (16) is positioned between the two fixed disks (15); the second squeeze roll (16) is sleeved on the surface of the first squeeze roll (13) in a sliding manner, and the fixed disc (15) is fixedly sleeved on the surface of the first squeeze roll (13); a second double-shaft cylinder (17) is fixedly connected between the second extrusion roller (16) and the adjacent fixed disc (15); the first double-shaft cylinder (11) and the second double-shaft cylinder (17) are both communicated with an external air source and are electrically connected with the controller, the controller can control the extension and retraction of the first double-shaft cylinder (11) and the second double-shaft cylinder (17), so that the width, height and length of the shaped steel pipe are controlled, meanwhile, the forward rotation and reverse rotation of the motor (14) can be controlled, the step-by-step treatment can be carried out when the larger steel pipe cannot be shaped at one time, and the steel pipe can be gradually shaped to an ideal shape.

2. A high precision steel pipe hot rolling apparatus according to claim 1, wherein: a pressure sensor and a distance sensor are arranged on the surface of the first extrusion roller (13) and between two adjacent second extrusion rollers (16) in the vertical direction; the pressure sensor and the distance sensor are electrically connected with the controller, and the first double-shaft cylinder (11) and the second double-shaft cylinder (17) can be controlled by the pressure sensor and the distance sensor to realize the movement of the first extrusion roller (13) and the second extrusion roller (16), so that the shaping accuracy of the steel pipe is adjusted.

3. A high precision steel pipe hot rolling apparatus according to claim 2, characterized in that: a first extrusion ring (2) is fixedly sleeved on the surface of the second extrusion roller (16) above; a second extrusion ring (21) is fixedly sleeved on the surface of the second extrusion roller (16) below; first recess (22) have been seted up in first extrusion ring (2), in second extrusion ring (21) can penetrate first recess (22), high temperature when preventing the steel pipe plastic influences pressure sensor and distance sensor's work, and steel pipe material gets into the clearance between second extrusion roller (16) when preventing simultaneously the steel pipe plastic, leads to the plastic failure.

4. A high precision steel pipe hot rolling apparatus according to claim 3, characterized in that: first extrusion ring (2) are close to one side of fixed disk (15) and all are equipped with the distance inductor of evenly arranging, it is connected with the controller electricity apart from the inductor, the controller electricity is connected with the alarm simultaneously, data through providing apart from the inductor, whether parallel between two second squeeze roll (16) about the analysis, and observe whether protruding size that forms between first extrusion ring (2) and the second squeeze ring (21) is unanimous, the alarm carries out the early warning when inconsistent and reminds, prevent that first squeeze roll (13) and second squeeze roll (16) from taking place the slope, lead to the steel pipe plastic failure.

5. A high precision steel pipe hot rolling apparatus according to claim 1, wherein: the side surface of one side opposite to the second extrusion roller (16) is provided with a circular second groove (3); first springs (31) which are uniformly arranged are arranged in the second groove (3); the first springs (31) are fixedly connected between the surface of the first squeezing roller (13) and the inner wall of the second groove (3), and two adjacent first springs (31) are arranged in a contact manner; a first sliding plate (32) is arranged in the second groove (3) in a sliding manner; first slide (32) ring shape design, and the design of first slide (32) surface cambered surface can make between the more convenient first slide (32) of entering of steel pipe, first slide (32) contact first spring (31) surface setting during the initial time, first spring (31) shrink completely to when unable deformation, first slide (32) middle part is parallel with second squeeze roll (16) surface, can effectively cool down second squeeze roll (16), strengthen the life of second squeeze roll (16).

6. A high precision steel pipe hot rolling apparatus according to claim 5, characterized in that: the side surface of one side, close to the fixed disc (15), of the second extrusion roller (16) is provided with uniformly arranged cavities (33); the cavities (33) are circumferentially arranged by taking the first extrusion roller (13) as a circle center; a second sliding plate (34) is connected in the cavity (33) in a sliding manner; a second spring (35) is fixedly connected between the side surface of one side of the second sliding plate (34) close to the first squeezing roller (13) and the inner wall of the cavity (33); the space in a cavity (33) above the second sliding plate (34) is communicated with the second groove (3) and the outside, the second sliding plate (34) moves up and down under the action of centrifugal force and a second spring (35), and the second extrusion roller (16) and the extrusion ring are cooled.