CN104785526A - Rolling mill and hollow roller thereof - Google Patents

Rolling mill and hollow roller thereof Download PDF

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Publication number
CN104785526A
CN104785526A CN201510232849.6A CN201510232849A CN104785526A CN 104785526 A CN104785526 A CN 104785526A CN 201510232849 A CN201510232849 A CN 201510232849A CN 104785526 A CN104785526 A CN 104785526A
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CN
China
Prior art keywords
roller
hollow
roll
cooling
cooling pipeline
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Pending
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CN201510232849.6A
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Chinese (zh)
Inventor
苏章仁
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Suzhou Industrial Science And Technology (beijing) Co Ltd
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Suzhou Industrial Science And Technology (beijing) Co Ltd
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Priority to CN201510232849.6A priority Critical patent/CN104785526A/en
Publication of CN104785526A publication Critical patent/CN104785526A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a hollow roller. The hollow roller comprises a roller body and roll necks which are arranged at the two ends of the roller body, the roller body is in a hollow-shaft shape, support components and a cooling pipeline are arranged in an inner cavity of the roller body, each support component is provided with multiple ends, and all the ends are fixedly connected with the inner wall of the roller body; the cooling pipeline penetrates through and fixed to the support components, and a cooling pipeline inlet and a cooling pipeline outlet are formed in the two ends of the cooling pipeline respectively. According to the hollow roller, the design idea that only a solid structure can be adopted for a roller is revolutionized, the support components are utilized, so that the roller strength is effectively guaranteed, the manufacturing cost is reduced, meanwhile, a hollow structure is combined with the cooling pipeline, the heat dissipation performance of the roller body is greatly improved, and it is facilitated that the dimensional precision and homogeneity of a hot rolled steel plate in the thickness direction are guaranteed. In addition, a rolling mill in which the hollow roller is adopted is further provided.

Description

Rolling mill and hollow roll thereof
Technical Field
The invention relates to steel plate production equipment, in particular to a rolling mill and a hollow roll thereof.
Background
Compared with cold-rolled steel sheets, hot-rolled steel sheets have a wider application range due to their greater price advantage. However, the hot rolled steel sheet has a fatal defect: the hot-rolled steel plate has the disadvantages of poor surface smoothness and low dimensional accuracy in the thickness direction, so that the hot-rolled steel plate can not replace a cold-rolled steel plate all the time and can only be applied to occasions with low accuracy requirements.
It is known that, in the rolling process of a hot-rolled steel sheet, the strength and the profile accuracy of a roll (the dimensional accuracy and consistency between the axis of the roll and each generatrix of the roll) are important factors for ensuring the dimensional accuracy and the uniformity in the thickness direction of the steel sheet, and the roll does not deform during the rolling process unless it has a high strength. However, due to the special workability of rolling a hot rolled steel sheet in a high temperature environment, it is inevitable that the roll is heated to cause expansion deformation during rolling, and the more heat the roll absorbs, the more the temperature rises and the larger the expansion deformation becomes. Thus, in the continuous rolling process, the size between the roll axis and the roll generatrix tends to be gradually changed, and the size precision and uniformity of the hot rolled steel plate in the thickness direction are affected.
In order to improve the strength of the roller and reduce the expansion deformation of the roller caused by heating in the rolling process, the roller is rolled by adopting a solid roller with large mass and high density at present. By utilizing the characteristics of high strength and large heat capacity of the roller, the temperature rise speed is slow when the roller absorbs the heat of a steel plate blank in the rolling process, the expansion deformation is reduced, and the high-temperature strength is improved. The method for manufacturing the roller comprises the following steps: conventional bulk casting, overflow or centrifugal casting, forging, and composite and combined processes using new process technologies. The compounding method mainly comprises a continuous casting compounding method (CPC method), an electroslag remelting surfacing method, a powder metallurgy hot isostatic pressing method, a spray forming method, a liquid metal electroslag compounding method (ESSLM method) and the like, and the principle of the compounding method for manufacturing the roller is that a working layer material is wrapped on a prefabricated roller core to manufacture the compound roller. The combination method is to assemble the hard alloy roll collar on the roll body to prepare the CIC (Cast-In-Carbide) roll.
The core of the roller manufacturing methods is to make the structure of the roller denser so as to ensure the strength and the better heat conduction performance of the roller, and further improve the heat capacity of the roller by increasing the radial dimension of the roller so as to ensure the outline dimension precision of the roller in a high-temperature working environment. The rollers designed by the methods are designed according to the solid structure, and the radial size is larger, so that the manufacturing cost is higher; meanwhile, although the heat capacity of the large-mass roller is large, the heat dissipation capacity is poor, and the heat capacities of the bearing blocks at the two ends of the roller and some transmission devices are smaller than that of the roller, so that cooling measures need to be taken for the bearing blocks and the transmission devices, and hydraulic force application parts at the two ends of the roller are taken into consideration, so that the complexity of the structure of the rolling mill equipment is increased.
Therefore, a new method is urgently needed for carrying out structural improvement on the existing solid roller, the deformation of the roller in a high-temperature working environment is reduced on the premise of ensuring the strength of the roller, and meanwhile, the manufacturing cost of the roller is greatly reduced.
Disclosure of Invention
The invention aims to solve the technical problems that the existing roller has large mass and high manufacturing cost, and the structure of rolling mill equipment is complicated due to cooling measures.
In order to solve the technical problems, the technical scheme adopted by the invention is to provide a hollow roller, which comprises a roller body and roller necks arranged at two ends of the roller body, wherein the roller body is in a hollow shaft shape, and an inner cavity of the roller body is internally provided with:
the supporting component is provided with a plurality of end parts, and each end part is fixedly connected with the inner wall of the roller body;
and the cooling pipeline penetrates through and is arranged on the support component, and a cooling pipeline inlet and a cooling pipeline outlet are respectively arranged at two ends of the cooling pipeline.
In the above scheme, the support assembly is a three-dimensional net structure, or the support assembly includes a plurality of support members, the plurality of support members are arranged at intervals along the axial direction of the roll body, and the arrangement manner of the intervals is as follows: the distance between the middle parts in the axial direction of the roller body is small, and the distance between the two ends is large.
In the above aspect, the support member is:
the roll body is a plane net structure capable of fixedly connecting multiple points on the inner wall of the roll body in the same plane.
In the above aspect, the support member is:
the honeycomb structure is a planar honeycomb structure formed by a regular hexagonal frame in a tetragonal continuous mode.
In the above-mentioned scheme, cooling pipe includes many cooling tubes, many the cooling tube is all followed the axial of roll body is run through and is fixed on the supporting component, many the both ends of cooling tube are connected to respectively cooling pipe entry and cooling pipe export.
In the above scheme, the cooling pipe comprises a cooling pipe, the cooling pipe is in be zigzag around along the axial in the roller body the support component is turned back reciprocating arrangement and is fixed on the support component, and returns the point and is located outside the axial outer terminal surface of support component, the both ends of cooling pipe are connected to respectively cooling pipe entry and cooling pipe export.
In the above scheme, the cooling pipe is composed of a heat radiation pipe, and the heat radiation pipe is spirally arranged and fixed on the support component in the axial direction of the roller body.
In the above scheme, cooling tube includes many cooling tubes and connecting pipe, every the cooling tube is the heliciform and arranges every in the bracing member, adjacent two cooling tube in the bracing member passes through the connecting pipe series connection, be equipped with on the lateral wall of regular hexagon frame and be used for the through-hole that the cooling tube passes through, the cooling tube passes each in proper order in radial direction the regular hexagon frame.
In the above scheme, the supporting component and the roller body are integrally formed, or the supporting component, the cooling pipeline and the roller body are integrally formed.
The invention also provides a rolling mill which comprises a rack and a cooling device, wherein a plurality of groups of rollers are arranged on the rack, the rollers adopt the hollow rollers with the structure, and the inlet of the cooling pipeline is connected with the output port of the cooling device.
The hollow roller provided by the invention changes the design idea that the temperature rise deformation of the roller can be reduced only by using a large-mass and high-density roller and improving the specific heat of the roller at present, the roller is designed into a hollow structure, and the supporting component is additionally arranged on the inner wall of the roller body, so that the strength of the roller is effectively ensured, the contour dimension precision of the roller in the rolling process is ensured, the manufacturing precision of the roller is indirectly improved, the material is saved, and the manufacturing cost is reduced; the hollow roller body structure is not only beneficial to heat dissipation, but also can timely and efficiently take away the heat absorbed by the roller by combining with a cooling pipeline, so that the heating expansion deformation of the roller is avoided; meanwhile, cooling measures for bearing blocks and transmission devices at two ends of the roller can be omitted, and the cost of the rolling mill is further reduced.
Drawings
FIG. 1 is a schematic view of the construction of a hollow roll according to the present invention;
fig. 2 is a schematic view of embodiment 1 of the support assembly of the present invention.
FIG. 3 is a schematic view of embodiment 2 of the support assembly of the present invention;
fig. 4 is a schematic view of embodiment 3 of the support assembly of the present invention.
FIG. 5 is a schematic view of a structure of a cooling pipe of the 1 st embodiment of the present invention;
FIG. 6 is a schematic front view of a cooling duct structure of type 2 according to the present invention;
FIG. 7 is a left side view of the structure of the cooling duct 2 according to the present invention.
FIG. 8 is a schematic view of a structure of a cooling pipe of the 3 rd embodiment of the present invention;
fig. 9 is a schematic view of the structure of the 4 th cooling pipe in the present invention.
FIG. 10 is a schematic view of A-A of FIG. 9 according to the present invention.
Detailed Description
The invention provides a hollow roller for rolling a hot-rolled steel plate, wherein a support assembly and a cooling pipeline are arranged in the hollow roller, so that on the basis of ensuring the structural strength, the roller body can be effectively prevented from being heated, expanded and deformed, the dimensional precision between the axis and the bus of the roller in the rotating process of the roller is greatly improved, and the uniformity of the hot-rolled steel plate in the thickness direction is ensured. The invention is described in detail below with reference to specific embodiments and the accompanying drawings.
As shown in figure 1, the hollow roll provided by the invention comprises a roll body 1 and roll necks 2 arranged at two ends of the roll body 1, wherein roll shafts are arranged at two ends of the roll necks 2, and the hollow roll is installed on a bearing block of a rolling mill through the roll shafts to perform rolling work.
The roller body 1 is arranged in a hollow shaft shape, and a supporting component 3 and a cooling pipeline 4 are arranged in an inner cavity of the roller body. The support member 3 has a plurality of end portions (end portions may be considered to be arranged in the radial direction of the roll body 1), and each end portion is fixedly connected to the inner wall of the roll body 1. The cooling pipeline 4 penetrates through the supporting component 3 along the axial direction of the roller body and is connected with the supporting component 3; the cooling duct 4 may or may not be fixedly connected to the support member 3. And a cooling pipeline inlet 5 and a cooling pipeline outlet 6 are respectively arranged at two ends of the cooling pipeline 4, and the cooling pipeline inlet 5 and the cooling pipeline outlet 6 respectively extend out of two end faces of the roller body 1. The roll neck 2 is fixed on the outer side of the support component.
The support assembly 3 is used for providing radial support for the roll body and preventing radial deformation of the hollow roll in the rolling process. The support member 3 may be in the form of a rib, a plate, a beam, a truss, or the like, and other forms of support members may be used as long as the support strength is satisfied. The cooling pipeline 4 is used for enhancing the heat dissipation performance of the roller body 1, and the cooling pipeline inlet 5 and the cooling pipeline outlet 6 are connected to a cooling device respectively, so that the cooling device can be used for taking away heat absorbed by the roller body, and the roller body 1 is prevented from being heated, expanded and deformed in the working process. It is of course also possible to adopt a design in which only the cooling duct inlet 5 is in communication with the liquid outlet of the cooling device, and the cooling duct outlet 6 is in communication with the liquid outlet according to actual needs.
The hollow roller provided by the invention changes the traditional design idea that the roller must adopt a solid structure, and the roller body adopts a hollow structure to match with the supporting component and the cooling pipeline, so that on the basis of ensuring the integral rigidity strength of the roller, on one hand, the manufacturing materials are greatly saved, on the other hand, the heat dissipation performance of the roller is improved, and the heating expansion deformation of the roller in the working process is reduced, thereby greatly improving the surface smoothness of the hot-rolled steel plate and the dimensional accuracy and uniformity in the thickness direction.
The hollow roller provided by the invention has the main structural design comprising two parts, namely a support assembly and a cooling pipeline, which are respectively described below.
Firstly, a support component is provided.
Since the main purpose of the support assembly is to provide radial support for the roll body and prevent radial deformation of the hollow roll caused by compression during rolling, the structural design of the support assembly is mainly considered to improve the radial support force. For this purpose, the support member is considered to be designed in a three-dimensional net structure or a combination of a plurality of planar net structures, and of course, a central radial support structure may be adopted, but obviously, the support strength is less than that of the net structure.
When the support assembly adopts a combination of a plurality of plane net structures, the support assembly comprises a plurality of support members arranged in the inner cavity of the roller body, and the plurality of support members are arranged at intervals along the axial direction of the roller body. The plane net structure is a structure capable of fixedly connecting multiple points on the inner wall of the roller body in the same plane. Among them, a planar honeycomb structure composed of a regular hexagonal frame in a tetragonal continuous manner is the most preferable. Whether the planar net structure or the three-dimensional net structure is adopted, the plane of the supporting component is not parallel to the axis of the roller body, wherein the supporting component is preferably perpendicular to the axis of the roller body.
When the supporting component adopts a three-dimensional net-shaped structure, a group of supporting components is adopted, namely the length of the supporting component is matched with the axial length of the roller body.
The specific structure that the support assembly may take is illustrated below by several specific embodiments.
Example 1:
as shown in fig. 2, the supporting component 3 is formed by combining a plurality of plane net structures, and specifically includes a plurality of supporting members arranged in the roll body, and the plurality of supporting members are uniformly distributed along the axial direction of the roll body, that is, the supporting members are uniformly arranged, so that the uniform supporting force can be obtained at each position on the roll body.
Example 2:
as shown in fig. 3, the present embodiment is different from embodiment 1 in that: the spacing between the plurality of support members is arranged to: the axial middle space along the roller body is small, the space between the two ends is large, the mode is that the axial middle space is small, the space between the two ends is large, the mode is distributed in order to be matched with the whole stress condition of the roller in the rolling process, when the roller is rolled, the strain stress at the two ends of the roller body is small, so that the support members are relatively loose in distribution, and on the contrary, the middle part is relatively dense in distribution.
Example 3:
as shown in fig. 4, the present embodiment is different from embodiment 1 in that: two adjacent supporting members are arranged in a crossed mode, so that a firmer and stable supporting structure can be formed, the strain of the roller is effectively overcome, and the integral rigidity strength of the roller is ensured.
Second, about the cooling duct.
Since the cooling ducts are mainly used to improve the heat dissipation performance of the roll body, the design of the cooling ducts is mainly designed to increase the contact area with the support members in the roll body. Under the principle, the following structural designs can be adopted.
The cooling duct structure of item 1.
As shown in fig. 5, the cooling pipe 4 includes a plurality of radiating pipes, and the plurality of radiating pipes are fixed on the supporting member by penetrating the supporting member in the axial direction of the roller body 1, and the plurality of radiating pipes are used to improve the heat dissipation performance. The two ends of the radiating pipes are converged and then are respectively connected to the inlet and the outlet of the cooling pipeline.
The 2 nd cooling duct structure.
As shown in fig. 6 and 7, the cooling duct 4 is composed of a heat dissipation pipe, the heat dissipation pipe is arranged in the roller body in a zigzag manner along the axial direction and is folded back and forth around the support member, and the heat dissipation pipe is fixed on the support member, and the folded back point is located outside the axial outer end face of the support member. Wherein, network structure has formed a plurality of clearances that link up, has finally formed a plurality of passages that link up along the ascending passageway of roll body axial length direction, and cooling pipeline reciprocates in proper order and runs through these passages for in the inside clearance of roll is covered with to cooling pipeline, thereby can effectually realize cooling heat dissipation through the coolant liquid.
And 3, a cooling pipeline structure.
As shown in fig. 8, the cooling pipe 4 is composed of a radiating pipe which is arranged spirally in the roll body along the axial direction and fixed on the supporting assembly, i.e. the radiating pipe spirally advances from one end of the roll body to the other end of the roll body.
And 4, a cooling pipeline structure.
This structure is suitable for the scheme that the support assembly adopts a combination of a plane net structure, the cooling pipe includes a plurality of radiating pipes 7 and connecting pipes 8, each radiating pipe is spirally arranged in each support member, and the radiating pipes in two adjacent support members are connected in series through the connecting pipes. Taking the planar honeycomb-shaped structural support members shown in fig. 9 and 10 as an example, each group of support members is provided with the radiating pipes 7 arranged spirally, the side walls of the regular hexagonal frames are provided with through holes for the radiating pipes to pass through, the radiating pipes sequentially pass through each regular hexagonal frame in the radial direction, the radiating pipes in two adjacent support members are connected in series through the connecting pipes 8, and all the radiating pipes 7 and the connecting pipes 8 form the cooling pipeline 4. In this scheme, all correspond a set of cooling tube on every group supporting member, adjacent cooling tube gets up through connecting pipe series connection, guarantees that every group supporting member and adjacent roll body can in time cool down the heat dissipation.
According to the scheme provided by the invention, the roller body and the supporting component are integrally cast and formed, or the roller body, the supporting component and the cooling pipeline are integrally cast and formed.
The invention also provides a rolling mill adopting the hollow roller, which comprises a rack and a cooling device, wherein the hollow rollers are transshipment arranged on the rack, the inlet of a cooling pipeline is connected with the output port of the cooling device, and the outlet of the cooling pipeline is connected with the input port of the cooling device. The cooling device is realized by the prior art, such as: pumping cycle systems, etc., will not be described in detail herein.
The present invention is not limited to the above-mentioned preferred embodiments, and any structural changes made under the teaching of the present invention shall fall within the protection scope of the present invention, which has the same or similar technical solutions as the present invention.

Claims (10)

1. The hollow roll comprises a roll body and roll necks arranged at two ends of the roll body, and is characterized in that the roll body is in a hollow shaft shape, and an inner cavity of the roll body is internally provided with:
the supporting component is provided with a plurality of end parts, and each end part is fixedly connected with the inner wall of the roller body;
and the cooling pipeline penetrates through and is arranged on the support component, and a cooling pipeline inlet and a cooling pipeline outlet are respectively arranged at two ends of the cooling pipeline.
2. The hollow rolling roll according to claim 1,
the supporting component is of a three-dimensional net structure; or,
the supporting component comprises a plurality of supporting members which are arranged at intervals along the axial direction of the roller body, and the spacing arrangement mode is as follows: the distance between the middle parts in the axial direction of the roller body is small, and the distance between the two ends is large.
3. The hollow roll of claim 2 wherein the support member is:
the roll body is a plane net structure capable of fixedly connecting multiple points on the inner wall of the roll body in the same plane.
4. The hollow roll according to claim 3, characterized in that the support member is:
the honeycomb structure is a planar honeycomb structure formed by a regular hexagonal frame in a tetragonal continuous mode.
5. The hollow roll according to claim 1, wherein the cooling pipe comprises a plurality of heat radiating pipes, the plurality of heat radiating pipes are inserted through and fixed to the support assembly in the axial direction of the roll body, and both ends of the plurality of heat radiating pipes are connected to the cooling pipe inlet and the cooling pipe outlet, respectively.
6. The hollow roll according to claim 1, wherein the cooling pipe is composed of a heat radiation pipe which is zigzag arranged in the roll body in the axial direction to turn back and forth around the support member and fixed to the support member, and the turn-back point is located outside the axial outer end face of the support member, and both ends of the heat radiation pipe are connected to the cooling pipe inlet and the cooling pipe outlet, respectively.
7. The hollow roll according to claim 1, wherein said cooling pipe is composed of a heat radiation pipe spirally arranged in the axial direction of said roll body and fixed to said support member.
8. The hollow roll as claimed in claim 4, wherein the cooling pipe includes a plurality of heat radiating pipes and connecting pipes, each of the heat radiating pipes is spirally arranged in each of the supporting members, the heat radiating pipes in adjacent two of the supporting members are connected in series by the connecting pipes, through holes for the heat radiating pipes to pass through are provided on the sidewalls of the regular hexagonal frames, and the heat radiating pipes sequentially pass through each of the regular hexagonal frames in a radial direction.
9. The hollow rolling roll according to any one of claims 1 to 8,
the supporting component and the roller body are integrally formed; or,
the supporting component, the cooling pipeline and the roller body are integrally formed.
10. The rolling mill comprises a frame and a cooling device, wherein a plurality of groups of rollers are arranged on the frame, and the rolling mill is characterized in that the rollers adopt hollow rollers as claimed in any one of claims 1 to 9, and the inlet of a cooling pipeline is connected with the outlet of the cooling device.
CN201510232849.6A 2015-05-08 2015-05-08 Rolling mill and hollow roller thereof Pending CN104785526A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510232849.6A CN104785526A (en) 2015-05-08 2015-05-08 Rolling mill and hollow roller thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510232849.6A CN104785526A (en) 2015-05-08 2015-05-08 Rolling mill and hollow roller thereof

Publications (1)

Publication Number Publication Date
CN104785526A true CN104785526A (en) 2015-07-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510232849.6A Pending CN104785526A (en) 2015-05-08 2015-05-08 Rolling mill and hollow roller thereof

Country Status (1)

Country Link
CN (1) CN104785526A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112496286A (en) * 2019-09-16 2021-03-16 斯凯孚公司 Roller body, roller body and method for producing the same
CN113020274A (en) * 2021-02-22 2021-06-25 山西铄金高温材料科技有限公司 Internal cooling system capable of uniformly reducing temperature of roller
CN114042775A (en) * 2021-11-23 2022-02-15 杰森能源技术有限公司 Metal pipe manufacturing equipment

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB285358A (en) * 1927-02-12 1928-08-02 Christian Rotzel Improvements in internally cooled rolls for hot rolling mills
CN1101308A (en) * 1993-10-04 1995-04-12 河南省中原轧辊厂 Roller with internal water cooling system and system thereof
JPH10235416A (en) * 1997-02-26 1998-09-08 Toshiba Fa Syst Eng Kk Roll device incorporated with motor for rolling and rolling device using this roll device
CN2461673Y (en) * 2000-11-06 2001-11-28 庄河市轧辊厂 Fluid internally cooling roller
RU2270069C1 (en) * 2004-06-28 2006-02-20 Волгоградский государственный технический университет (ВолгГТУ) Cooled roll
CN201442011U (en) * 2009-06-24 2010-04-28 鞍钢股份有限公司 Tandem rolling inner cooling roller cooling water pipe
CN203791342U (en) * 2014-04-28 2014-08-27 北京中传首高冶金成套设备有限公司 Water cooling device for heat delivery roller table

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB285358A (en) * 1927-02-12 1928-08-02 Christian Rotzel Improvements in internally cooled rolls for hot rolling mills
CN1101308A (en) * 1993-10-04 1995-04-12 河南省中原轧辊厂 Roller with internal water cooling system and system thereof
JPH10235416A (en) * 1997-02-26 1998-09-08 Toshiba Fa Syst Eng Kk Roll device incorporated with motor for rolling and rolling device using this roll device
CN2461673Y (en) * 2000-11-06 2001-11-28 庄河市轧辊厂 Fluid internally cooling roller
RU2270069C1 (en) * 2004-06-28 2006-02-20 Волгоградский государственный технический университет (ВолгГТУ) Cooled roll
CN201442011U (en) * 2009-06-24 2010-04-28 鞍钢股份有限公司 Tandem rolling inner cooling roller cooling water pipe
CN203791342U (en) * 2014-04-28 2014-08-27 北京中传首高冶金成套设备有限公司 Water cooling device for heat delivery roller table

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112496286A (en) * 2019-09-16 2021-03-16 斯凯孚公司 Roller body, roller body and method for producing the same
CN113020274A (en) * 2021-02-22 2021-06-25 山西铄金高温材料科技有限公司 Internal cooling system capable of uniformly reducing temperature of roller
CN114042775A (en) * 2021-11-23 2022-02-15 杰森能源技术有限公司 Metal pipe manufacturing equipment

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Application publication date: 20150722