CN212419558U

CN212419558U - Guide section roller assembly

Info

Publication number: CN212419558U
Application number: CN202020853568.9U
Authority: CN
Inventors: 何博; 梁龙; 李积文; 焦悦; 路海波; 张忍德
Original assignee: China National Heavy Machinery Research Institute Co Ltd
Current assignee: China National Heavy Machinery Research Institute Co Ltd
Priority date: 2020-05-20
Filing date: 2020-05-20
Publication date: 2021-01-29
Anticipated expiration: 2030-05-20

Abstract

The utility model discloses a guide section roller assembly, which comprises an installation base (1), a shaft end baffle (2), a fixing component (3), a roller assembly (4) and a gasket group (5), wherein the roller assembly (4) comprises a mandrel (41) and a roller sleeve (42), wherein the mandrel (41) is coaxially sleeved at the inner side of the roller sleeve (42), the number of the shaft end baffles (2) is two, wherein two shaft end baffles (2) respectively fix two ends of a mandrel (41) on the mounting base (1) through fixing components (3), wherein two end surfaces of the mandrel (41) are respectively provided with a lubricating oil inlet (6) and a cooling water inlet (7) or a cooling water outlet (8), a gasket group (5) is arranged on the joint surface of the mandrel (41) and the mounting base (1), wherein the mandrel (41) and the mounting base (1) do not rotate relatively, and the roller sleeve (42) can rotate around the mandrel (41).

Description

Guide section roller assembly

Technical Field

The utility model belongs to the technical field of metallurgical continuous casting equipment, specifically be to square billet and round billet caster casting blank direction section roller assembly and design, especially relate to a direction section roller assembly.

Background

In the production process of the square billet and round billet continuous casting machine, the guide section positioned in the secondary cold sealing chamber is in a high-temperature environment, and accidents are easy to happen to the square billet in production. Thus requiring that the guide section roller assembly must be easily replaceable and less costly. In the existing commonly used guide section roller assembly, a mandrel and a roller body rotate together, so that the mandrel and an installation base are subjected to rotational friction, heat is generated, and potential safety hazards are caused; meanwhile, because the mandrel and the roller body rotate together in the assembly of the guide section roller, a rotary joint must be additionally arranged to cool the mandrel and the bearing; in addition, the existing roller assembly occupies a large space, is not beneficial to the equipment arrangement in the area and simultaneously brings the defects of increased maintenance amount and cost; the existing roller is inconvenient to assemble and install and troublesome to operate, and the production rhythm of square billets and round billets is reduced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above-mentioned prior art not enough, provide a direction section roller assembly, overcome prior art in 1: in the common guide section roller assembly, a core shaft and a roller body rotate together, so that the core shaft and an installation base are subjected to rotational friction, and heat is generated to cause potential safety hazards; 2: because the central spindle and the roller body rotate together in the existing guide section roller assembly, a rotary joint must be additionally arranged to cool the central spindle and the bearing; 3: the existing roller assembly occupies a large space, is not beneficial to the equipment arrangement in the area and simultaneously brings the defects of increased maintenance amount and cost; 4: the existing roller is inconvenient to assemble and install and troublesome to operate, and the problems of production rhythm of square billets and round billets and the like are reduced.

In order to solve the technical problem, the technical scheme of the utility model is that: the roller assembly comprises a mandrel and a roller sleeve, wherein the mandrel is coaxially sleeved on the inner side of the roller sleeve, the number of the shaft end baffles is two, the two ends of the mandrel are fixed on the mounting base through the fixing assemblies respectively, the two end faces of the mandrel are provided with a lubricating oil inlet and a cooling water inlet or a cooling water outlet respectively, the gasket group is arranged on the joint face of the mandrel and the mounting base, the mandrel and the mounting base do not rotate relatively, and the roller sleeve can rotate around the mandrel.

Preferably, the roller assembly further comprises two bearings and two end covers, wherein the two bearings are respectively and coaxially sleeved on the inner sides of the two ends of the roller sleeve, the mandrel is coaxially sleeved on the inner sides of the two bearings, the mandrel and the roller sleeve are coaxial, the axial size of the mandrel is larger than that of the roller sleeve, the two end covers are respectively sleeved on the outer side of the mandrel, and the end covers are fixed with the end faces of the roller sleeve.

Preferably, the roller sleeve is of a hollow cylindrical structure, wherein inner walls of two ends of the roller sleeve are respectively provided with an inwards concave trapezoidal groove, the bearing can be coaxially sleeved in the trapezoidal groove, the two axial ends of the bearing are respectively provided with a sealing ring, the end cover is arranged on the outer side of the trapezoidal groove, the end cover wraps the bearing in the trapezoidal groove through a bolt and a gasket, the sealing rings are arranged to fix the inner ring and the outer ring of the bearing and ensure that the bearing is completely immersed in a lubricating medium, and a sealing cavity is formed between the mandrel and the roller sleeve.

Preferably, the outer wall of the mandrel is provided with a limiting protrusion, wherein the limiting protrusion is arranged at the contact position of the mandrel and the dovetail groove of the roller sleeve, and the radial size of the mandrel at the limiting protrusion is larger than that of the bearing and used for limiting the axial sliding of the bearing.

Preferably, lubricating oil inlets are respectively arranged at two ends of the mandrel, wherein the lubricating oil inlets are connected with oil guide holes arranged in the mandrel, an oil guide groove is arranged on the mounting surface of the mandrel close to the bearing, and the oil guide holes are communicated with the oil guide groove to ensure that the injected lubricating oil can lubricate the bearing.

Preferably, the two ends of the mandrel are respectively provided with a cooling water inlet and a cooling water outlet, wherein the cooling water inlet and the cooling water outlet are respectively connected with a water guide hole arranged in the mandrel, and the other end of the water guide hole is respectively communicated with a sealing cavity formed between the mandrel and the roller sleeve.

Preferably, the installation base both sides are equipped with two U type grooves, and wherein the dabber both ends all are equipped with four machined surfaces, and wherein the size and the four machined surfaces cooperation in U type groove, wherein the center pin of roller assembly is parallel with the center pin of installation base, the machined surface top of dabber both ends upside is fixed through the axle head baffle, utilizes fixed subassembly to fix axle head baffle and installation base side fixed, and wherein fixed subassembly is fixing bolt and gasket, the machined surface and the U type bottom of the groove portion of dabber both ends downside are equipped with the gasket group.

Compared with the prior art, the utility model has the advantages of:

(1) the utility model discloses an installation base, axle head baffle, fixed subassembly, roller assembly and gasket group, roller assembly include dabber and roller shell, the dabber coaxial suit is inboard in the roller shell, two axle head baffles are fixed the dabber both ends on the installation base through fixed subassembly respectively, dabber and installation base faying face are equipped with gasket group, wherein the dabber does not produce relative rotation with the installation base, wherein the roller shell can rotate around the dabber, the utility model discloses fix the dabber on the installation base, the dabber does not produce relative rotation with the installation base, the roller shell can rotate around the dabber with the bearing outer lane together, has avoided friction to produce the heat, has avoided the potential safety hazard, the utility model discloses the dabber does not rotate with the roller shell, therefore does not need to install swivel joint additional to cool off dabber and bearing, the cost is reduced;

(2) the utility model discloses when the roller assembly breaks down and needs the maintenance, can disassemble the fixed subassembly on the axle head baffle, take out the roller assembly wholly from the installation base, change new roller assembly and carry out work, off-line maintenance reduces online maintenance time, the utility model discloses direction section roller assembly installation is nimble, easy operation, occupation space are little, are favorable to this regional equipment arrangement, have reduced the maintenance volume, and the dismouting of roller assembly is quick convenient, and the adjustment of casting blank pitch arc is also comparatively convenient, has improved square billet and round billet production rhythm;

(3) the utility model discloses roller assembly dabber outer wall is equipped with spacing arch, spacing arch sets up in the dovetail groove contact department of dabber and roller shell, suit the bearing in this dovetail groove, and bearing axial both ends all set up the sealing washer, and set up the end cover outside the dovetail groove and wrap up the bearing in the dovetail groove, make between dabber and the roller shell form seal chamber like this, make the bearing also be in encapsulated situation, two seal spaces are kept apart from each other, consequently, can pour into cooling water from the cooling water inlet, get into the seal chamber that dabber and roller shell formed through the dabber, then the cooling water is derived through the cooling water export, reach the purpose of cooling dabber, roller shell and bearing, simultaneously can pour into lubricating medium through the lubricating oil inlet, make the bearing soak in lubricating medium completely;

(4) the utility model discloses roller assembly can be according to demand adjustment roller diameter and length, satisfies different section demands, and complete roller assembly is according to the roller row design, arranges in a flexible way on the frame, at the roller row intact casting blank that supports of outer arc side, and self lubrication and cooling effect are good, and life obtains obviously improving.

Drawings

FIG. 1 is a schematic perspective view of a roller assembly of a guide section according to the present invention;

FIG. 2 is a schematic sectional view of the roller assembly of the guide section of the present invention;

FIG. 3 is a schematic view of the cross-sectional structure A-A of FIG. 2 according to the present invention;

fig. 4 is a schematic view of a mandrel structure for assembling a roller at a guide section of the present invention.

Description of the reference numerals

1-mounting a base, 2-shaft end baffle, 3-fixing component, 4-roller assembly, 5-gasket group, 6-lubricating oil inlet, 7-cooling water inlet, 8-cooling water outlet and 9-U-shaped groove;

41-mandrel, 42-roller sleeve, 43-bearing, 44-sealing ring, 45-end cover, 46-bolt and gasket;

411-oil guide hole, 412-oil guide groove, 413-water guide hole and 414-limit projection;

421-trapezoidal groove.

Detailed Description

The following description of the embodiments of the present invention is provided in connection with the following embodiments:

it should be noted that the structures, ratios, sizes, etc. illustrated in the present specification are only used to cooperate with the contents disclosed in the specification for the understanding and reading of the people skilled in the art, and are not used to limit the limit conditions that the present invention can be implemented, and any modifications of the structures, changes of the ratio relationships or adjustments of the sizes should still fall within the scope that the technical contents disclosed in the present invention can cover without affecting the functions and the achievable purposes of the present invention.

Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.

Example 1

As shown in fig. 1-2, the utility model relates to a guide section roller assembly, including installation base 1, axle head baffle 2, fixed subassembly 3, roller assembly 4 and shim pack 5, roller assembly 4 includes dabber 41 and roller shell 42, and wherein the coaxial suit of dabber 41 is inboard in roller shell 42, axle head baffle 2 is two, and wherein two axle head baffles 2 are fixed dabber 41 both ends on installation base 1 through fixed subassembly 3 respectively, and wherein dabber 41 both ends face is equipped with lubricating oil import 6 and cooling water inlet 7 or cooling water outlet 8 respectively, dabber 41 is equipped with shim pack 5 with installation base 1 faying face, and wherein dabber 41 does not produce relative rotation with installation base 1, and wherein roller shell 42 can rotate around dabber 41.

Example 2

Preferably, as shown in fig. 2, the roller assembly 4 further includes two bearings 43 and two end caps 45, wherein the two bearings 43 are coaxially sleeved inside the two ends of the roller sleeve 42, respectively, the mandrel 41 is coaxially sleeved inside the two bearings 43, wherein the mandrel 41 is coaxial with the roller sleeve 42 and the axial dimension of the mandrel 41 is greater than the axial dimension of the roller sleeve 42, the two end caps 45 are respectively sleeved outside the mandrel 41 and the end caps 45 are fixed to the end faces of the roller sleeve 42.

Example 3

Preferably, as shown in fig. 2 and 3, the roller sleeve 42 is a hollow cylindrical structure, wherein inner walls of two ends of the roller sleeve 42 are provided with concave trapezoidal grooves 421, the bearing 43 can be coaxially sleeved in the trapezoidal grooves 421, wherein two axial ends of the bearing 43 are provided with sealing rings 44, the end cover 45 is arranged outside the trapezoidal grooves 421, wherein the end cover 45 wraps the bearing 43 in the trapezoidal grooves 421 through bolts and gaskets 46, the sealing rings 44 are arranged to fix the inner and outer rings of the bearing 43 while ensuring that the bearing 43 is completely immersed in the lubricating medium, and a sealed cavity is formed between the mandrel 41 and the roller sleeve 42.

Example 4

Preferably, as shown in fig. 2 and 3, the outer wall of the mandrel 41 is provided with a limiting protrusion 414, wherein the limiting protrusion 414 is disposed at a contact position of the mandrel 41 and the trapezoidal groove 421 of the roller shell 42, and the radial dimension of the mandrel 41 at the limiting protrusion 414 is greater than the radial dimension of the bearing 43 for limiting the axial sliding of the bearing 43.

Preferably, as shown in fig. 2 and 3, the two ends of the spindle 41 are respectively provided with a lubricating oil inlet 6, wherein the lubricating oil inlet 6 is connected with an oil guide hole 411 arranged inside the spindle 41, the mounting surface of the spindle 41 close to the bearing 43 is provided with an oil guide groove 412, and the oil guide hole 411 is communicated with the oil guide groove 412 to ensure that the injected lubricating oil lubricates the bearing 43.

Example 5

Preferably, as shown in fig. 2 and 3, the two ends of the mandrel 41 are respectively provided with a cooling water inlet 7 and a cooling water outlet 8, wherein the cooling water inlet 7 and the cooling water outlet 8 are respectively connected with a water guide hole 413 arranged inside the mandrel 41, and the other end of the water guide hole 413 is respectively communicated with a sealed cavity formed between the mandrel 41 and the roller sleeve 42.

Preferably, as shown in fig. 1, two U-shaped grooves 9 are formed in two sides of the mounting base 1, wherein four processing surfaces are formed at two ends of the mandrel 41, the size of each U-shaped groove 9 is matched with the four processing surfaces, the central shaft of the roller assembly 4 is parallel to the central shaft of the mounting base 1, the tops of the processing surfaces on the upper sides of the two ends of the mandrel 41 are fixed through the shaft end baffle 2, the shaft end baffle 2 is fixed to the side surface of the mounting base 1 through the fixing component 3, the fixing component 3 is a fixing bolt and a gasket, and the processing surfaces on the lower sides of the two ends of the mandrel 41 and the bottoms of the U-shaped grooves 9 are provided.

Example 6

Preferably, the method for installing the guide segment roller assembly comprises the following steps:

step 1) after the roller sleeve 42 is sleeved outside the mandrel 41, two bearings 43 are arranged between the roller sleeve 42 and the mandrel 41 in a contact manner, an end cover 45 is arranged at the outer end of the roller sleeve 42, and the end cover 45, the mandrel 41 and the roller sleeve 42 fix the inner ring and the outer ring of the bearings 43 to complete the installation of the roller assembly 4;

step 2) installing two ends of the installed roller assembly 4 on the installation base 1, enabling a central shaft of the roller assembly 4 to be parallel to a central shaft of the installation base 1, fixing the shaft end baffle 2 on the side face of the installation base 1 at the upper end of the mandrel 41 through the fixing component 3, arranging gasket groups 5 at the contact positions of the lower sides of the two ends of the mandrel 41 and the installation base 1, and adjusting the installation height of the roller assembly 4 to the designed installation requirement by adjusting the thickness of the gasket groups 5;

step 3), after the roller assembly 4 is assembled with the installation base 1, the mandrel 41 is fixed with the installation base 1, and the roller sleeve 42 and the outer ring of the bearing 43 can rotate around the mandrel 41 together;

and step 4) when the roller assembly 4 breaks down and needs to be maintained, the fixing component 3 on the shaft end baffle plate 2 can be disassembled, the whole roller assembly 4 is taken out of the mounting base 1, and a new roller assembly 4 is replaced for work.

Preferably, after the roller sleeve 42 and the outer ring of the bearing 43 rotate around the mandrel 41 in the step 3, cooling water can be injected from the cooling water inlet 7 and enter the sealed cavity formed by the mandrel 41 and the roller sleeve 42 through the mandrel 41, and after the roller sleeve 42 is cooled, the cooling water is led out through the cooling water outlet 8, so as to achieve the purpose of cooling the mandrel 41, the roller sleeve 42 and the bearing 43, and simultaneously, a lubricating medium can be injected through the lubricating oil inlet 6, so that the bearing 43 is completely soaked in the lubricating medium.

As shown in fig. 4, four processes are arranged in the circumferential direction of the two ends of the mandrel 41, the four process surfaces can be matched with the U-shaped groove 9, the tops of the process surfaces on the upper sides of the two ends of the mandrel 41 are fixed through the shaft end baffle 2, the shaft end baffle 2 is fixed with the side surface of the mounting base 1 through the fixing component 3, the process surfaces on the lower sides of the two ends of the mandrel 41 and the bottom of the U-shaped groove 9 are provided with the gasket group 5, and the mounting height of the roller assembly 4 is adjusted to the designed mounting requirement by adjusting the thickness of the gasket group 5; the mandrel 41 is further provided with two oil guide grooves 412, the oil guide grooves 412 are communicated with the oil guide holes 411 to ensure that the injected lubricating oil can lubricate the bearing 43, the mandrel 41 is further provided with two limiting protrusions 414, the limiting protrusions 414 are arranged at the contact position of the mandrel 41 and the trapezoidal groove 421 of the roller sleeve 42, and the radial size of the mandrel 41 at the limiting protrusions 414 is larger than that of the bearing 43 and is used for limiting the axial sliding of the bearing 43.

The working principle of the utility model is as follows:

as shown in fig. 1 to 4, the present invention includes a mounting base 1, a shaft end baffle 2, a fixing assembly 3, a roller assembly 4 and a gasket set 5, wherein the roller assembly 4 is composed of a mandrel 41, a roller sleeve 42, a bearing 43, a sealing ring 44, an end cover 45, a bolt and a gasket 46, two ends of the mandrel 41 are respectively provided with a lubricating oil inlet 6 and a cooling water inlet 7 or a cooling water outlet 8, a mounting surface of the mandrel 41 close to the bearing 43 is provided with an oil guide groove 412, the oil guide hole 411 is connected with the oil guide groove 412 to ensure that the injected lubricating oil well lubricates the bearing 43, two ends of the bearing 43 are provided with the sealing ring 44 to ensure that the bearing 43 is completely immersed in the lubricating medium, cooling water is injected from the cooling water inlet 7 of the mandrel 41 and enters a sealed cavity formed by the mandrel 41 and the roller sleeve 41 through a water guide hole 413 on the mandrel 41, after the cooling roller 42, the purpose of cooling the mandrel 41 and the bearing 43 is achieved at the same time, after the roller sleeve 42 and the mandrel 41 are installed, the bearing 43 is installed between the roller sleeve 42 and the mandrel 41, the end cover 45 is installed on the outer side of the roller sleeve 42, and the end cover 45, the mandrel 41 and the roller sleeve 42 fix the inner ring and the outer ring of the bearing 43; roller assembly 4 assembled completely is installed on U type groove 9 of base 1, U type groove 9 size and the circular four machined surfaces all around of dabber 41 both ends cooperate, it fixes on base 1 to be convenient for roller assembly 4, the center of roller assembly 4 is parallel with the center of base 1, fix with axle head baffle 2 above dabber 41, and be connected axle head baffle 2 and base 1 with bolt and gasket 3, dabber 41 has gasket group 5 with the faying face of base 1, the thickness of accessible adjustment gasket group 5, adjust the mounting height of roller assembly to the installation requirement of design, roller assembly 4 and installation base 1 assembly back, dabber 41 is fixed with installation base 1, roller cover 42 rotates around dabber 41 with bearing 43 outer lane together.

The utility model discloses an installation base, axle head baffle, fixed subassembly, roller assembly and gasket group, roller assembly include dabber and roller shell, and the coaxial suit of dabber is inboard in the roller shell, and two axle head baffles are fixed the dabber both ends on the installation base through fixed subassembly respectively, and the dabber is equipped with the gasket group with installation base faying face, and wherein the dabber does not produce relative rotation with the installation base, and wherein the roller shell can rotate around the dabber, the utility model discloses on being fixed in the installation base with the dabber, the dabber does not produce relative rotation with the installation base, and the roller shell can rotate around the dabber with the bearing inner race together, has avoided the friction to produce the heat, has avoided the potential safety hazard, the utility model discloses the dabber does not rotate along with the roller shell, need not install rotary joint additional so and cool.

The utility model discloses when the roller assembly breaks down and needs the maintenance, the fixed subassembly on the detachable axle head baffle takes out the whole installation base of follow of roller assembly, changes new roller assembly and carries out work, and the off-line is maintained, reduces online maintenance time, the utility model discloses direction section roller assembly installation is nimble, easy operation, occupation space are little, are favorable to this regional equipment to arrange, have reduced the maintenance volume, and the dismouting of roller assembly is convenient fast, and the adjustment of casting blank pitch arc is also comparatively convenient, has improved square billet and round billet production rhythm.

The utility model discloses roller assembly dabber outer wall is equipped with spacing arch, spacing arch sets up in the dovetail groove contact department of dabber and roller shell, adorn the bearing sleeve in this dovetail groove, and bearing axial both ends all set up the sealing washer, and set up the end cover and wrap up the bearing in the dovetail groove outside, make and form seal chamber between dabber and the roller shell like this, make the bearing also be in encapsulated situation, two seal space mutual isolations, consequently, can pour into cooling water into from the cooling water inlet, get into the seal chamber that dabber and roller shell formed through the dabber, the cooling water exports through the cooling water export afterwards and derives, reach the cooling dabber, the purpose of roller shell and bearing, simultaneously accessible lubricating oil import pours into lubricating medium into, make the bearing soak completely in lubricating medium.

The utility model discloses roller assembly can be according to demand adjustment roller diameter and length, satisfies different section demands, and complete roller assembly is according to the roller row design, arranges in a flexible way on the frame, at the roller row intact casting blank that supports of outer arc side, and self lubrication and cooling effect are good, and life obtains obviously improving.

Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, and that the scope of the invention is defined by the appended claims.

Claims

1. A guide segment roller assembly characterized by: the roller assembly comprises an installation base (1), two shaft end baffles (2), two fixing assemblies (3), two roller assemblies (4) and two gasket sets (5), wherein each roller assembly (4) comprises a mandrel (41) and a roller sleeve (42), the mandrels (41) are coaxially sleeved on the inner side of the roller sleeve (42), the two shaft end baffles (2) are respectively used for fixing the two ends of the mandrel (41) on the installation base (1) through the fixing assemblies (3), the two end faces of the mandrel (41) are respectively provided with a lubricating oil inlet (6) and a cooling water inlet (7) or a cooling water outlet (8), the gasket sets (5) are arranged on the joint face of the mandrel (41) and the installation base (1), the mandrel (41) and the installation base (1) do not rotate relatively, and the roller sleeve (42) can rotate around the mandrel (41).

2. A guide segment roller assembly as claimed in claim 1, wherein: the roller assembly (4) further comprises two bearings (43) and two end covers (45), wherein the two bearings (43) are coaxially sleeved on the inner sides of two ends of the roller sleeve (42) respectively, the mandrel (41) is coaxially sleeved on the inner sides of the two bearings (43), the mandrel (41) and the roller sleeve (42) are coaxial, the axial size of the mandrel (41) is larger than that of the roller sleeve (42), the number of the end covers (45) is two, the two end covers (45) are sleeved on the outer sides of the mandrel (41) respectively, and the end covers (45) are fixed with the end faces of the roller sleeve (42).

3. A guide segment roller assembly as claimed in claim 2, wherein: the roller sleeve (42) is of a hollow cylindrical structure, wherein inner walls of two ends of the roller sleeve (42) are respectively provided with an inwards concave trapezoidal groove (421), the bearing (43) can be coaxially sleeved in the trapezoidal groove (421), the two axial ends of the bearing (43) are respectively provided with a sealing ring (44), the end cover (45) is arranged on the outer side of the trapezoidal groove (421), the bearing (43) is wrapped in the trapezoidal groove (421) through the end cover (45) through a bolt and a gasket (46), the sealing ring (44) is arranged to fix the inner ring and the outer ring of the bearing (43) and ensure that the bearing (43) is completely immersed in a lubricating medium, and a sealing cavity is formed between the mandrel (41) and the roller sleeve (42).

4. A guide segment roller assembly as claimed in claim 3, wherein: the outer wall of the mandrel (41) is provided with a limiting protrusion (414), wherein the limiting protrusion (414) is arranged at the contact position of the mandrel (41) and the trapezoid groove (421) of the roller sleeve (42), and the radial size of the mandrel (41) at the limiting protrusion (414) is larger than that of the bearing (43) and used for limiting the axial sliding of the bearing (43).

5. A guide segment roller assembly as claimed in claim 3, wherein: the lubricating oil lubricating structure is characterized in that lubricating oil inlets (6) are respectively arranged at two ends of the mandrel (41), wherein the lubricating oil inlets (6) are connected with oil guide holes (411) arranged inside the mandrel (41), an oil guide groove (412) is arranged on the mounting surface, close to the bearing (43), of the mandrel (41), and the oil guide holes (411) are communicated with the oil guide groove (412) to ensure that injected lubricating oil lubricates the bearing (43).

6. A guide segment roller assembly as claimed in claim 3, wherein: the roller is characterized in that a cooling water inlet (7) and a cooling water outlet (8) are respectively arranged at two ends of the mandrel (41), wherein the cooling water inlet (7) and the cooling water outlet (8) are respectively connected with a water guide hole (413) arranged inside the mandrel (41), and a sealed cavity is formed between the other end of the water guide hole (413) and the mandrel (41) and the roller sleeve (42) to be communicated.

7. A guide segment roller assembly as claimed in claim 1, wherein: installation base (1) both sides are equipped with two U type grooves (9), and wherein dabber (41) both ends all are equipped with four machined surfaces, and wherein the size and the cooperation of four machined surfaces in U type groove (9), and wherein the center pin of roller assembly (4) is parallel with the center pin of installation base (1), the machined surface top of dabber (41) both ends upside is fixed through axle head baffle (2), utilizes fixed subassembly (3) to fix axle head baffle (2) and installation base (1) side, and wherein fixed subassembly (3) are fixing bolt and gasket, the machined surface and U type groove (9) bottom of dabber (41) both ends downside are equipped with shim group (5).