CN214391633U

CN214391633U - Novel short-stress pull rod prestress universal rolling mill

Info

Publication number: CN214391633U
Application number: CN202022824162.0U
Authority: CN
Inventors: 朱跃刚
Original assignee: Zhongzhong Science and Technology Tianjin Co Ltd
Current assignee: Zhongzhong Science and Technology Tianjin Co Ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-10-15
Anticipated expiration: 2030-11-30

Abstract

The invention provides a novel short-stress pull rod prestress universal rolling mill which comprises a vertical roll beam, an upper horizontal roll system, a lower horizontal roll system, a vertical roll, a hydraulic assembly, a pull rod and a trolley, wherein the vertical roll beam is fixed at the top of the trolley, the horizontal roll system is installed on the vertical roll beam through a bearing seat, the upper horizontal roll system and the lower horizontal roll system are arranged in parallel, two ends of each bearing seat extend towards two sides to form installation blocks, each installation block corresponding to the upper horizontal roll system is provided with the hydraulic assembly, the installation blocks and the vertical roll beam are respectively provided with a through hole corresponding to the pull rod, the pull rod sequentially penetrates through the hydraulic assembly, the installation blocks corresponding to the upper horizontal roll system, the vertical roll beam and the lower horizontal roll system through the through holes, and the bottom of the pull rod is fixedly provided with a bearing plate for bearing the lower horizontal roll system through a locking pin. The novel short-stress pull rod prestress universal rolling mill solves the problems that certain gaps still exist among parts of the conventional short-stress rolling mill, the pressing effect is poor, the roll changing efficiency is low, and the disassembly and the assembly are inconvenient.

Description

Novel short-stress pull rod prestress universal rolling mill

Technical Field

The invention belongs to the technical field of universal rolling mills, and particularly relates to a novel short-stress pull rod prestress universal rolling mill.

Background

The traditional short stress rolling mill is divided into Danieli and Pomini, and the structure is mostly balance nut, gland nut, spherical pad, and elastic damping body is balanced. According to the balance principle, the balance nut is tightly matched with the upright post thread, the balance force of the elastic damping body is derived from the balance nut, acts on the bearing end cover, lifts the whole weight of the bearing seat, and the force is upwards transmitted to the spherical pad from the lower part of the bearing seat, so that a lower gap is formed between the compression nut and the lead screw, and the gap between the screw and the lead screw is reduced. Certain gaps still exist among all parts of the conventional short stress rolling mill, the pressing effect is poor, the roll changing efficiency is low, and the roll changing machine is inconvenient to disassemble and assemble.

Disclosure of Invention

In view of the above, the invention provides a novel short stress pull rod prestressed universal rolling mill to solve the problems that certain gaps still exist among parts of the conventional short stress rolling mill, the compacting effect is poor, the roll changing efficiency is low, and the disassembly and the assembly are inconvenient.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the novel short-stress pull rod prestress universal rolling mill comprises an upper horizontal roll system, a lower horizontal roll system, vertical roll assemblies, hydraulic assemblies, pull rods and a trolley, wherein vertical roll beams are fixed at the top of the trolley, the vertical rolls are provided with two vertical rolls, the two vertical roll assemblies are oppositely arranged on the inner sides of the vertical roll beams, the lower horizontal roll system is arranged on the lower portion of the vertical roll beams through bearing seats, the upper horizontal roll system is arranged on the upper portion of the vertical roll beams through the bearing seats, the upper horizontal roll system and the lower horizontal roll system are arranged in parallel, two ends of each bearing seat extend towards two sides to form mounting blocks, one hydraulic assembly is arranged on each mounting block corresponding to the upper horizontal roll system, a plurality of pull rods are arranged on the vertical roll beams and respectively correspond to the mounting blocks on two sides of the horizontal roll system, through holes corresponding to the pull rods are formed in the mounting blocks and the vertical roll beams, and the pull rods sequentially penetrate through the hydraulic assemblies and the mounting blocks corresponding to the upper horizontal roll system through the through holes, The vertical roll crossbeam and the lower horizontal roll system are corresponding to each other, the bottom of the pull rod is fixed with a bearing plate for bearing the lower horizontal roll system through a locking pin, and the vertical roll crossbeam is also provided with a pressing component for adjusting the upper horizontal roll system and the lower horizontal roll system.

Furthermore, the hydraulic assembly comprises a locking oil cylinder and a locking nut, the locking oil cylinder is installed on a fixing block corresponding to the upper horizontal roller system, the locking nut is arranged on the upper portion of the locking oil cylinder, the pull rod penetrates through the locking oil cylinder and the locking nut, a threaded portion is arranged on the pull rod, the pull rod is in threaded connection with the compression nut through the threaded portion, and the compression nut is compressed on the locking oil cylinder.

Further, the edger roll crossbeam includes horizontal pole and side lever, and side lever and horizontal roller are parallel arrangement, and two side levers all are connected with a horizontal pole between the same end, and an edger roll assembly is all installed to every horizontal pole inboard, and the side lever top links to each other with the bearing frame, and the outside of side lever is fixed with the installed part, and the side lever passes through the installed part and links to each other with the dolly, and it has the through-hole that corresponds with the pull rod to open on the side lever, and the pull rod passes through the through-hole and runs through in the side lever.

Furthermore, the screw-down assembly comprises a draw beam and screw-down nuts, the number of the draw beams is four, the upper part and the lower part of each side rod are connected with the draw beam through bolts, the draw beam and the side rods are arranged in parallel, the draw beam positioned on the vertical roll beam is arranged at the bottom of the mounting block, the draw rod penetrates through the draw beam, the screw holes corresponding to the screw-down nuts are formed in the draw beam, the screw-down nuts are in threaded connection with the draw beam through the screw holes, the top of the draw rod is connected with a screw-down device used for driving the draw beam to rotate, and the bottom of the draw rod and the trolley are arranged at intervals.

Furthermore, a retaining ring is fixed at the position, located inside the side rod, of the pull rod, and a groove retaining ring corresponding to the retaining ring is arranged in the groove and is formed in the side rod.

Furthermore, a key groove is formed in the pull rod, a key corresponding to the key groove is arranged on the inner side of the pressing nut, and the pressing nut is connected with the pull rod key.

Further, still include the footing board, the slide rail is installed to the footing board both sides, and the dolly bottom is equipped with the slider that corresponds with the slide rail, dolly and slide rail sliding connection, slide rail and last horizontal roller are parallel arrangement, and the one end of going up horizontal roller system, lower horizontal roller system all is connected with the cardan shaft, and the one end that the slide rail is close to the cardan shaft still installs the spiale bracket that is used for carrying out the bearing to the cardan shaft, and the roller changing subassembly is installed to one side that the dolly was kept away from to the spiale bracket.

Compared with the prior art, the invention has the following advantages:

(1) the novel short-stress pull rod prestress universal rolling mill provided by the invention has the advantages that the pull rod penetrates through the hydraulic assembly, the bearing seat, the pull rod and the vertical roll beam, the operation is simple and convenient, each structural part can be rapidly disassembled, and the roll can be rapidly changed while the integral compression is realized.

(2) The opening degree of the roller system is adjusted by adjusting the distance between the upper nut and the lower nut of the compression nut.

(3) The hydraulic locking oil cylinder applies prestress to eliminate gaps existing in the assembly of a roll system bearing seat, a compression nut, a vertical roll assembly beam and the like, and the pull rod is applied with prestress to increase the rigidity of the short-stress rolling mill.

(4) The prestress applied by the hydraulic assembly achieves the effect of prestress mechanical locking through the mechanical locking of the locking nut on the hydraulic locking oil cylinder, the prestress applied by the hydraulic locking oil cylinder to the pull rod increases the rigidity of the rolling mill, the position of a pre-arranged roll gap of the rolling mill is ensured to be unchanged, and the rolling precision is ensured

(5) The compression nut is installed in the vertical roll cross beam, the compression nut is driven to rotate on the cross beam through a key installed on the pull rod, simultaneous symmetrical adjustment is achieved, the roll system bearing block is directly seated on the compression nut, the pull rod is tensioned through the prestress hydraulic cylinder, and rolling requirements are met.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:

FIG. 1 is a schematic view of a novel short-stress pull rod prestressed universal mill according to an embodiment of the present invention;

FIG. 2 is a schematic view of a novel short-stress pull rod prestressed universal mill according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a novel short-stress pull rod prestressed universal rolling mill according to an embodiment of the present invention;

FIG. 4 is a schematic side view of the novel short stress pull rod prestressed universal rolling mill according to the inventive embodiment of the present invention;

FIG. 5 is a schematic view of a pull rod, a vertical roll assembly and a vertical roll beam according to the inventive embodiment of the present invention;

FIG. 6 is a schematic view of a pull rod, a compression nut and a vertical roll beam according to an embodiment of the present invention;

FIG. 7 is a schematic view of an adapter bracket according to an embodiment of the present invention;

fig. 8 is a front view schematically illustrating the novel short-stress pull rod prestressed universal rolling mill according to the inventive embodiment of the present invention.

Description of reference numerals:

1. a trolley; 11. a base plate; 12. a slide rail; 13. a compression nut; 14. a keyway; 17. assembling a vertical roller; 2. a lower horizontal roll system; 3. an upper horizontal roll system; 31. a bearing seat; 32. mounting blocks; 4. a vertical roll beam; 41. a cross bar; 42. a side lever; 43. a mounting member; 5. drawing a beam; 6. a roll changing assembly; 61. a supporting seat; 62. a roll changing hydraulic cylinder; 7. a spindle bracket; 71. a U-shaped frame; 72. clamping a plate; 73. a supporting strip; 74. a screw; 8. a pull rod; 81. a baffle ring; 82. pressing down the nut; 83. a pressure bearing plate; 84. a locking pin; 9. a hydraulic assembly; 91. locking the oil cylinder; 92. locking the nut; 10. and pressing down the device.

Detailed Description

It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.

In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.

The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.

As shown in figures 1 to 4, the novel short-stress pull rod prestress universal rolling mill comprises an upper horizontal roll system 3, a lower horizontal roll system 2, a vertical roll assembly 17, a hydraulic assembly 9, a pull rod 8 and a trolley 1, wherein a vertical roll beam 4 is fixed at the top of the trolley 1, two vertical roll assemblies 17 are arranged, the two vertical roll assemblies 17 are oppositely arranged on the inner side of the vertical roll beam 4, the lower horizontal roll system 2 is arranged on the lower part of the vertical roll beam 4 through a bearing seat 31, the upper horizontal roll system 3 is arranged on the upper part of the vertical roll beam 4 through the bearing seat 31, the upper horizontal roll system 3 and the lower horizontal roll system 2 are arranged in parallel, two ends of each bearing seat 31 extend towards two sides to form mounting blocks 32, one hydraulic assembly 9 is arranged on each mounting block 32 corresponding to the upper horizontal roll system 3, a plurality of pull rods 8 are arranged on the vertical roll beam 4 and respectively correspond to the mounting blocks 32 on two sides of the horizontal roll systems, the mounting blocks 32, The vertical roll beam 4 is provided with through holes corresponding to the pull rods 8, the pull rods 8 sequentially penetrate through the hydraulic assembly 9, the mounting blocks 32 corresponding to the upper horizontal roll system 3, the vertical roll beam 4 and the mounting blocks 32 corresponding to the lower horizontal roll system 2 through the through holes, the bottom of each pull rod 8 is fixed with a bearing plate 83 for bearing the lower horizontal roll system 2 through a locking pin 84, and the vertical roll beam 4 is further provided with a pressing assembly for adjusting the upper horizontal roll system 3 and the lower horizontal roll system 2.

As shown in fig. 1 to 4, the hydraulic assembly 9 includes a locking cylinder 91 and a locking nut 92, the locking cylinder 91 is mounted on a fixing block corresponding to the upper horizontal roller system 3, the locking nut 92 is disposed on the upper portion of the locking cylinder 91, the pull rod 8 penetrates through the locking cylinder 91 and the locking nut 92, a threaded portion is disposed on the pull rod 8, the pull rod 8 is in threaded connection with the compression nut 13 through the threaded portion, and the compression nut 13 is compressed on the locking cylinder 91.

As shown in fig. 1 to 2, the vertical roll beam 4 includes a cross bar 41 and a side bar 42, the side bar 42 and the horizontal roll system are arranged in parallel, one cross bar 41 is connected between the same ends of the two side bars 42, an upright roll assembly 17 is installed on the inner side of each cross bar 41, the top of the side bar 42 is connected with the bearing seat 31, an installation part 43 is fixed on the outer side of the side bar 42, the side bar 42 is connected with the trolley 1 through the installation part 43, a through hole corresponding to the pull rod 8 is opened on the side bar 42, and the pull rod 8 penetrates through the side bar 42 through the through hole.

As shown in fig. 1, 2 and 6, the screw-down assembly comprises a tension beam 5 and screw-down nuts 82, the number of the tension beams 5 is four, the upper part and the lower part of each side rod 42 are connected with the tension beam 5 through bolts, the tension beam 5 is arranged in parallel with the side rods 42, the tension beam 5 on the vertical roll beam 4 is arranged at the bottom of the mounting block 32, the tension rod 8 penetrates through the tension beam 5, the screw-down nuts 82 are fixed on the tension beam 5, the tension beam 5 is provided with threaded holes corresponding to the screw-down nuts 82, the screw-down nuts 82 are in threaded connection with the tension beam 5 through the threaded holes, the top of the tension rod 8 is connected with a screw-down device 10 for driving the tension rod to rotate, and the bottom of the tension rod 8 is arranged at intervals with the trolley 1. The screw-down device 10 is not limited to a turbine box, which is a prior art and will not be described in detail herein.

As shown in fig. 1 to 4, a stop ring 81 is fixed on the pull rod 8 at a position inside the side rod 42, and a groove stop ring 81 corresponding to the stop ring 81 is formed on the side rod 42 and is arranged in the groove.

As shown in fig. 6, the pull rod 8 is provided with a key groove 14, the inner side of the pressing nut 82 is provided with a key corresponding to the key groove 14, and the pressing nut 82 is connected with the key of the pull rod 8.

As shown in fig. 1, fig. 2 and fig. 8, the roll changing device further comprises a base plate 11, slide rails 12 are mounted on two sides of the base plate 11, a slide block corresponding to the slide rail 12 is arranged at the bottom of the trolley 1, the trolley 1 is connected with the slide rail 12 in a sliding manner, the slide rail 12 is arranged in parallel with the upper horizontal roller system 3, one end of the upper horizontal roller system 3 and one end of the lower horizontal roller system 2 are both connected with a universal shaft, a spindle bracket 7 used for supporting the universal shaft is further mounted at one end, close to the universal shaft, of the slide rail 12, and a roll changing assembly 6 is mounted on one side, far away from the trolley 1, of the spindle bracket 7.

As shown in fig. 2 and 7, the spindle bracket 7 includes a

U-shaped frame

71, 3 screws 74 and a clamping plate 72, the ends of the U-shaped frame 71 are fixedly connected to the slide rails 12 through a fixing plate, one of the screws 74 is mounted on the top of the U-shaped frame 71 through a screw seat, the screw 74 penetrates through the U-shaped frame 71, the clamping plate 72 is rotatably connected to the bottom of the screw 74, the other two screws 74 are rotatably connected to the fixing plate through screw seats, and the clamping plate 72 is rotatably connected to the top of the screw 74.

As shown in fig. 7, a clamping groove corresponding to the universal shaft is formed on the clamping plate 72, and supporting bars 73 for supporting the universal shaft are fixed at two ends of the bottom of the clamping plate 72;

the inner side of the U-shaped frame 71 is provided with a guide groove corresponding to the clamping plate 72, and two sides of the clamping plate 72 are arranged in the guide groove.

As shown in fig. 2 and 8, the roll changing assembly 6 comprises a supporting seat 61 and a roll changing hydraulic cylinder 62, the roll changing hydraulic cylinder 62 is mounted on the supporting seat 61, an expansion rod of the roll changing hydraulic cylinder 62 penetrates through a U-shaped frame 71, and the end part of the expansion rod is fixedly connected with the trolley 1.

The novel short-stress pull rod prestress universal rolling mill provided by the invention has the advantages that the pull rod 8 penetrates through the hydraulic assembly 9, the bearing seat 31, the pull rod 8 and the vertical roll beam 4, the operation is simple and convenient, each structural part can be rapidly disassembled, and the rapid roll change is realized.

The locking oil cylinder 91 compresses the bearing seat 31 and the vertical roll beam 4, wherein the rolling mill body structure is that the prestressed pull rod 8 is positioned on the tension beam 5 (can move up and down in a certain range), the top of the pull rod 8 is connected with the screw-down device 10 in a spline mode, and the compression nut (left and right screw nuts) positioned on the tension beam 5 can be controlled to move up and down by rotating the pull rod 8 through the screw-down device 10. The upper and lower roll system bearing blocks 31 are directly contacted with the compression nuts on the vertical roll beam 4. The opening degree of the roller system is adjusted by adjusting the distance between the upper nut and the lower nut of the compression nut. The bearing block 31 of the upper horizontal roller system 3 is provided with a hydraulic locking oil cylinder 91. The hydraulic locking oil cylinder 91, the upper horizontal roller system 3, the vertical roller beam 4, the compression nut 13, the lower horizontal roller system 2, the lower horizontal roller bearing plate 83, the locking pin 84 and the vertical roller beam 4 are locked into a whole through the pull rod 8. The hydraulic locking oil cylinder 91 applies prestress to eliminate gaps existing in the assembly of the roll system bearing seat 31, the compression nut, the vertical roll beam 4 and the like, and applies prestress to the pull rod 8 to increase the rigidity of the short-stress rolling mill. Due to the prestress applied by the hydraulic assembly 9, the effect of prestress mechanical locking is achieved through the mechanical locking of the locking nut 92 on the hydraulic locking oil cylinder 91, and a hydraulic system can stop working when the rolling mill works. The prestress applied to the pull rod 8 by the hydraulic locking oil cylinder 91 increases the rigidity of the rolling mill, so that the position of a pre-arranged roll gap of the rolling mill is not changed, and the rolling precision is ensured.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.

Claims

1. Novel short stress pull rod prestressing force universal mill, its characterized in that: the roller device comprises an upper horizontal roller system (3), a lower horizontal roller system (2), vertical roller assemblies (17), hydraulic assemblies (9), pull rods (8) and a trolley (1), wherein vertical roller beams (4) are fixed at the top of the trolley (1), the number of the vertical roller assemblies (17) is two, the two vertical roller assemblies (17) are oppositely arranged on the inner sides of the vertical roller beams (4), the lower horizontal roller system (2) is arranged on the lower parts of the vertical roller beams (4) through bearing seats (31), the upper horizontal roller system (3) is arranged on the vertical roller beams (4) through the bearing seats (31), the upper horizontal roller system (3) and the lower horizontal roller system (2) are arranged in parallel, two ends of each bearing seat (31) extend towards two sides to form mounting blocks (32), one hydraulic assembly (9) is arranged on each mounting block (32) corresponding to the upper horizontal roller system (3), a plurality of pull rods (8) are arranged on the vertical roller beams (4), the installation blocks (32) on two sides of the horizontal roller system are arranged correspondingly, through holes corresponding to the pull rods (8) are formed in the installation blocks (32) and the vertical roller beam (4), the pull rods (8) sequentially penetrate through the hydraulic assemblies (9) through the through holes, the installation blocks (32) corresponding to the upper horizontal roller system (3), the vertical roller beam (4) and the installation blocks (32) corresponding to the lower horizontal roller system (2), a bearing plate (83) used for bearing the lower horizontal roller system (2) is fixed to the bottom of the pull rods (8) through locking pins (84), and a pressing component used for adjusting the upper horizontal roller system (3) and the lower horizontal roller system (2) is further installed on the vertical roller beam (4).

2. The new short stress pull rod prestressed universal mill according to claim 1, characterized in that: the hydraulic assembly (9) comprises a locking oil cylinder (91) and a locking nut (92), the locking oil cylinder (91) is installed on a fixing block corresponding to the upper horizontal roller system (3), the locking nut (92) is arranged on the upper portion of the locking oil cylinder (91), the pull rod (8) penetrates through the locking oil cylinder (91) and the locking nut (92), a threaded portion is formed in the pull rod (8), the pull rod (8) is in threaded connection with the compression nut (13) through the threaded portion, and the compression nut (13) is compressed on the locking oil cylinder (91).

3. The new short stress pull rod prestressed universal mill according to claim 1, characterized in that: vertical roll crossbeam (4) are including horizontal pole (41) and side lever (42), side lever (42) are parallel arrangement with the horizontal roll, two side lever (42) all are connected with a horizontal pole (41) between the same end, an edger roll assembly (17) is all installed to every horizontal pole (41) inboard, side lever (42) top links to each other with bearing frame (31), the outside of side lever (42) is fixed with installed part (43), side lever (42) link to each other with dolly (1) through installed part (43), open the through-hole that corresponds with pull rod (8) on side lever (42), pull rod (8) run through in side lever (42) through the through-hole.

4. The new short stress pull rod prestressed universal mill according to claim 3, characterized in that: the screw-down component comprises a straining beam (5), screw-down nuts (82), the straining beam (5) is four, the upper part and the lower part of each side rod (42) are connected with the straining beam (5) through bolts, the straining beam (5) and the side rods (42) are arranged in parallel, the straining beam (5) positioned on the vertical roller beam (4) is arranged at the bottom of the mounting block (32), a pull rod (8) penetrates through the straining beam (5), the screw-down nuts (82) are fixed on the straining beam (5), threaded holes corresponding to the screw-down nuts (82) are formed in the straining beam (5), the screw-down nuts (82) are in threaded connection with the straining beam (5) through the threaded holes, the top of the pull rod (8) is connected with screw-down devices (10) used for driving the rotation of the pull rod (8), and the bottom of the pull rod (8) and the trolley (1) are arranged at intervals.

5. The new short stress pull rod prestressed universal mill according to claim 4, characterized in that: a baffle ring (81) is fixed on the pull rod (8) at the position inside the side rod (42), a groove corresponding to the baffle ring (81) is formed on the side rod (42), and the baffle ring (81) is arranged in the groove.

6. The new short stress pull rod prestressed universal mill according to claim 4, characterized in that: the pull rod (8) is provided with a key groove (14), the inner side of the pressing nut (82) is provided with a key corresponding to the key groove (14), and the pressing nut (82) is connected with the pull rod (8) in a key mode.

7. The new short stress pull rod prestressed universal mill according to claim 1, characterized in that: still include footing board (11), slide rail (12) are installed to footing board (11) both sides, dolly (1) bottom is equipped with the slider that corresponds with slide rail (12), dolly (1) and slide rail (12) sliding connection, slide rail (12) are (3) parallel arrangement with last horizontal roller, it is (3) to go up horizontal roller, the one end that lower horizontal roller was (2) all is connected with the cardan shaft, connecting axle bracket (7) that are used for carrying out the bearing to the cardan shaft are still installed to the one end that slide rail (12) are close to the cardan shaft, one side that dolly (1) was kept away from in connecting axle bracket (7) is installed and is traded roller assembly (6).

8. The new short stress pull rod prestressed universal mill according to claim 7, characterized in that: roll change subassembly (6) include supporting seat (61), roll change pneumatic cylinder (62), and roll change pneumatic cylinder (62) are installed on supporting seat (61), and the telescopic link of roll change pneumatic cylinder (62) runs through in U-shaped frame (71), tip and dolly (1) fixed connection.