A multi-roller star-shaped precision rolling mill with adjustable eccentric sleeve gap

Abstract

The invention discloses a multi-roller star-shaped precision rolling mill with adjustable eccentric sleeve gap at any time, comprising a shell, wherein a plurality of groups of eccentric roller shaft assemblies arranged in a star shape at the same angle are arranged in the shell; a thrust bearing is arranged at the contact point between the eccentric support sleeve in the eccentric roller shaft assembly and the shell, and a plurality of ball head adjustment screws for contacting the upper end surface of the thrust bearing are arranged on the eccentric support sleeve; each eccentric roller shaft assembly is provided with a roller located inside the shell, and the circumferential outer walls of the plurality of rollers are provided with rolling grooves with a circular arc structure in cross section, and the plurality of rolling grooves form a rolling hole for rolling a rolled piece, and the reaction force of the thrust bearing on the ball head adjustment screw acts on the flange of the eccentric support sleeve, so as to drive the eccentric roller shaft assembly to move backward to eliminate the axial gap, thereby achieving the purpose of solving the problem of axial roller shifting of the rollers in the eccentric roller shaft assembly, and the adjustment operation is simple and convenient by means of symmetrical tightening with a fixed torque, without wasting time and without the occurrence of a jamming scene.

Description

Technical Field

[0001] The invention relates to the technical field of rolling mills, in particular to a multi-roller star-shaped precision rolling mill with an eccentric sleeve gap adjustable at any time. Background Art

[0002] The multi-roller star-shaped precision rolling mill belongs to the field of steel rolling technology and is mainly used for rolling bars and wires. Because it rolls the workpiece with at least three or more rolls evenly distributed on the circumference of the rolling center line, compared with the two-roller rolling mill with transmission, the rolled products have unique advantages such as high dimensional accuracy, good surface quality, good metallographic structure, and high yield rate. In order to improve the quality and dimensional accuracy of the products, general steel mills use multi-roller star-shaped precision rolling mills for semi-finishing and finishing rolling processes.

[0003] The main problems of the existing multi-roller star-shaped precision rolling mill are:

[0004] (1) After a period of use, the multi-roller star-shaped precision rolling mill has roll shifting during the rolling process, which seriously affects the rolling dimensional accuracy and surface quality of the product. This is mainly reflected in the left and right shifting of the rolls during the rolling process. The previously adjusted hole size specification accuracy cannot be guaranteed during the rolling process, which ultimately results in unsatisfactory rolling quality of the product.

[0005] (2) During the use of the multi-roller star-shaped precision rolling mill, the rolling mill needs to be frequently adjusted axially to the left and right to adjust the hole type surrounded by multiple rollers to always remain on a center line. The axial adjustment is generally on the large copper sleeve on the roller shaft. The large copper sleeve is rotated by a tool to drive the entire roller shaft assembly to move axially. The large copper sleeve and the tooling are easily deformed due to their own material characteristics during long-term use. After deformation, the entire roller shaft assembly needs to be disassembled and the large copper sleeve needs to be replaced. The disassembly and replacement of the large copper sleeve is troublesome, which seriously affects the maintenance and use of the product by on-site operators;

[0006] (3) After the axial adjustment of the multi-roller star-shaped precision rolling mill, the adjusted large copper sleeve needs to be locked. During the locking process, the roller shaft that has been axially adjusted changes and is difficult to adjust. At the same time, the on-site workers found that the rollers still move slightly after locking, and the locking nuts cannot be locked tightly. Summary of the invention

[0007] In view of the above problems in the prior art, the present invention provides a multi-roller star-shaped precision rolling mill with an eccentric sleeve gap that can be adjusted at any time, thereby solving the problem of roll shifting during the rolling process in the multi-roller star-shaped precision rolling mill in the prior art.

[0008] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0009] A multi-roller star-shaped precision rolling mill with an eccentric sleeve gap adjustable at any time is provided, which comprises a housing, in which a plurality of groups of eccentric roller shaft assemblies arranged in a star shape at the same angle are arranged;

[0010] A thrust bearing is arranged at the contact point between the eccentric support sleeve and the housing in the eccentric roller shaft assembly, and a plurality of ball head adjustment screws for contacting the upper end surface of the thrust bearing are arranged on the eccentric support sleeve;

[0011] Each eccentric roller shaft assembly is provided with a roller located inside the shell, and the circumferential outer walls of the multiple rollers are provided with rolling grooves with a circular arc cross-section. The multiple rolling grooves surround a rolling hole for rolling the workpiece; each eccentric roller shaft assembly is provided with a locking nut assembly for adjusting the axial displacement of the eccentric roller shaft assembly.

[0012] The basic principle of the multi-roller star-shaped precision rolling mill in this scheme in which the clearance of the eccentric sleeve can be adjusted at any time is as follows: a thrust bearing is arranged at the contact point between the eccentric sleeve and the shell, and the function of the thrust bearing can realize the rotation of the entire eccentric roller shaft assembly relative to the shell; when the eccentric roller shaft assembly is adjusted axially, the ball head adjusting screw is tightened with a wrench with a fixed torque after each replacement of the eccentric roller shaft assembly, and the ball head adjusting screw is matched with the end face of the thrust bearing. Since the ball head adjusting screw is pressed against the thrust bearing, if the contact point between the eccentric sleeve and the shell is not processed smoothly, the reaction force of the thrust bearing on the ball head adjusting screw can act on the flange of the eccentric sleeve, thereby driving the eccentric roller shaft assembly between the eccentric sleeve and the shell. The position of the contact point is adjusted to achieve leveling of the eccentric roller shaft assembly, so that the rotation of the eccentric roller shaft assembly is stable, thereby achieving the purpose of solving the axial roller shifting of the roller in the eccentric roller shaft assembly. The adjustment operation is simple and convenient by symmetrical tightening with a fixed torque, without wasting time and without jamming on the scene. At the same time, a locking nut assembly for adjusting the axial displacement of the eccentric roller shaft assembly is provided. The axial displacement of the eccentric roller shaft assembly is adjusted by the locking nut assembly, thereby adjusting the axial displacement of the roller on the eccentric roller shaft assembly. Through this design, the stability of the rolled products of the multi-roller star rolling mill is further improved, the dimensional accuracy of the rolled products is greatly improved, and the service life of the rolling mill is extended.

[0013] Furthermore, a flange is provided on the circumferential outer wall of one side of the eccentric support sleeve, and a plurality of mounting threaded through holes for threadably cooperating with a plurality of ball head adjusting screws are provided on the flange;

[0014] Each mounting threaded through hole is matched with a ball head adjusting screw; the upper end face of the thrust bearing is provided with a plurality of grooves for cooperating with the ends of a plurality of ball head adjusting screws. The setting of the grooves makes the contact between the ball head adjusting screw and the upper end face of the thrust bearing more stable, avoiding the phenomenon that the ball head adjusting screw slides on the upper end face of the thrust bearing when the ball head adjusting screw is tightened with a wrench at a fixed torque.

[0015] Furthermore, as a specific arrangement of the eccentric roller shaft assembly, each set of eccentric roller shaft assemblies includes an eccentric sleeve assembly and a roller shaft assembly arranged inside the eccentric sleeve assembly, and the tail of the roller shaft assembly is fixedly connected to the eccentric sleeve assembly through a locking nut assembly.

[0016] Further, as a specific arrangement of the eccentric sleeve assembly, the eccentric sleeve assembly includes a middle eccentric sleeve, and an eccentric bearing sleeve and an eccentric support sleeve are respectively arranged at both ends of the middle eccentric sleeve;

[0017] The middle eccentric sleeve and the eccentric bearing sleeve are detachably connected through a support plate assembly; and the roller is arranged between the middle eccentric sleeve and the eccentric bearing sleeve.

[0018] Furthermore, as a specific setting mode of the support plate assembly, the support plate assembly includes two mounting plates respectively connected to the inner end faces of the middle eccentric sleeve and the eccentric bearing sleeve, each mounting plate is eccentrically provided with a circular through hole, the axis of the circular through hole coincides with the axis of the middle eccentric sleeve and the eccentric bearing sleeve; the tops of the two mounting plates are fixedly connected by a connecting block, and the connecting block is provided with a lubricating oil channel; the roller is arranged between the two mounting plates. The setting of the support plate assembly, firstly, realizes the connection between the middle eccentric sleeve and the eccentric bearing sleeve, and secondly, facilitates disassembly, thus realizing the disassembly and assembly of the roller.

[0019] Furthermore, the roller shaft assembly includes a long shaft arranged in the eccentric sleeve assembly, and one end of the long shaft is connected to the bevel gear sleeve in the eccentric support sleeve;

[0020] An annular mounting step and a copper sleeve are arranged on the circumferential outer wall of the long shaft, and the copper sleeve is connected to the circumferential outer wall of the long shaft through the annular mounting step and the locking ring;

[0021] A rotating bearing is arranged in the copper sleeve, and the inner ring of the rotating bearing is fixedly connected to the circumferential outer wall of the long shaft;

[0022] A waterproof sleeve is provided inside one side of the copper sleeve, and the waterproof sleeve is sleeved on the circumferential outer wall of the long shaft;

[0023] After the roller shaft assembly is matched with the eccentric sleeve assembly, the copper sleeve is located inside the eccentric support sleeve and is locked by the locking nut assembly. The copper sleeve is provided for the purpose of being threadedly matched with the locking nut assembly. With the joint cooperation of the locking nut assembly and the copper sleeve, the long shaft and the eccentric sleeve assembly are matched and fixed.

[0024] Further, as a specific arrangement of the locking nut assembly, the locking nut assembly includes a first spiral ring and a second spiral ring having the same inner diameter and both provided with internal threads, a plurality of cylindrical pins are provided between the first spiral ring and the second spiral ring, and a gap is provided between two inner end surfaces of the first spiral ring and the second spiral ring;

[0025] A screw is arranged on the end surface of the first screw ring, and the screw passes through the first screw ring and is threadedly connected with the second screw ring; the first screw ring and the second screw ring are threadedly matched with the external thread of the copper sleeve.

[0026] The purpose of setting multiple cylindrical pins is: first, to ensure that the rotation direction of the internal threads of the first screw ring and the second screw ring can be connected with the starting angle of the external thread on the circumferential outer wall of the copper sleeve; when the locking nut assembly is rotated, there will be no relative rotation between the first screw ring and the second screw ring; if there is relative rotation between the first screw ring and the second screw ring, the internal threads of the first screw ring and the second screw ring are inconsistent, and when matching with the external thread on the circumferential outer wall of the copper sleeve, they will become stuck and cannot be adjusted; second, to ensure that there is enough gap between the first screw ring and the second screw ring.

[0027] The purpose of setting the screw is to provide a pre-tightening force between the first screw ring and the second screw ring, and the screw is tightened and loosened by a wrench during use to lock; when locking, since the screw connects the first screw ring and the second screw ring together, tightening the screw will generate a pre-tightening force, which reduces the gap between the first screw ring and the second screw ring, eliminates the gap between the threads, and always maintains a large pre-tightening force to achieve locking with the external thread of the copper sleeve, avoiding the first screw ring and the second screw ring from loosening; and the size of the pre-tightening force can be adjusted according to the torque of the screw wrench, and the locking effect is more ideal, which can meet a wide range of adjustments. When it is necessary to rotate and adjust the first screw ring and the second screw ring, it is only necessary to loosen the screw, the pre-tightening force disappears, and the first screw ring and the second screw ring can be rotated and adjusted.

[0028] Further, as a specific arrangement of the first spiral ring and the second spiral ring, the outer diameter of the first spiral ring is smaller than the outer diameter of the second spiral ring; an assembly step connected to the end face of the eccentric support sleeve is provided on the circumferential inner wall; the outer side surface of the first spiral ring cooperates with the assembly step; a plurality of waist-shaped annular grooves and positioning holes are provided on the second spiral ring, and the plurality of annular grooves are arranged annularly with the axis of the second spiral ring as the center, and the corresponding center of each annular groove coincides with the center of the second spiral ring;

[0029] The end surface of the eccentric support sleeve is provided with a threaded locking piece for cooperating with a plurality of annular grooves and a positioning pin for cooperating with the positioning hole; the inner end surface of the second screw ring contacts the end surface of the eccentric support sleeve.

[0030] The second screw ring is fixedly connected to the threaded locking member, the positioning pin and the eccentric support sleeve through a plurality of waist-shaped annular grooves and positioning holes, respectively, so as to realize the rotation of the first screw ring and the second screw ring at a certain angle, thereby facilitating the locking and disassembly of the first screw ring and the second screw ring.

[0031] Furthermore, an oil nozzle is arranged on the end face of the second spiral ring, and an oil passage connected to the oil nozzle is arranged inside the first spiral ring and the second spiral ring. The lubricating oil can directly reach the surface of the inner thread of the first spiral ring and the second spiral ring through the oil nozzle and the oil passage for lubrication.

[0032] Furthermore, a wear-resistant steel sleeve is embedded on the end surface of the copper sleeve near the annular installation step, and the center of the wear-resistant steel sleeve coincides with the center of the copper sleeve. This solves the problem of direct contact with the copper sleeve when the tooling is used to adjust the roller shaft assembly axially, avoids deformation and damage of the copper sleeve, and extends its service life.

[0033] The beneficial effects of the present invention are:

[0034] 1. In the multi-roller star-shaped precision rolling mill in which the eccentric sleeve gap can be adjusted at any time, the eccentric roller shaft assembly is rotatably connected to the shell through the thrust bearing, so that the entire eccentric roller shaft assembly can rotate relative to the shell, and the multiple ball head adjustment screws on the eccentric support sleeve push against the thrust bearing. If there is a small axial gap between the thrust bearing and the shell axially and the position of the contact between the eccentric support sleeve and the shell is unevenly processed, the reaction force of the thrust bearing on the ball head adjustment screw can be applied to the flange of the eccentric support sleeve to drive the eccentric roller shaft assembly to move backward to eliminate the axial gap and realize the leveling of the eccentric roller shaft assembly, so that the eccentric roller shaft assembly can rotate stably, thereby achieving the purpose of solving the axial roller shifting of the roller in the eccentric roller shaft assembly. The adjustment operation is simple and convenient by means of fixed torque symmetrical tightening, without wasting time and without jamming. Through this design, the stability of the rolled products of the multi-roller star-shaped rolling mill is further improved, the dimensional accuracy of the rolled products is greatly improved, and the service life of the rolling mill is extended.

[0035] 2. In the present scheme, the multi-roller star-shaped precision rolling mill whose eccentric sleeve gap can be adjusted at any time, the locking nut assembly cooperates with the copper sleeve thread through the first screw ring and the second screw ring, and the locking nut assembly cooperates with the threaded locking member and the locating pin through the annular groove and the positioning hole respectively to realize fixed connection with the eccentric support sleeve; when it is necessary to adjust the eccentric roller shaft assembly for axial adjustment, the first screw ring and the second screw ring are screwed, and the first screw ring and the second screw ring drive the roller shaft assembly to move axially, so that the roller shaft assembly is axially displaced relative to the eccentric sleeve assembly, thereby realizing axial adjustment of the roller in the roller shaft assembly; after the axial displacement adjustment of the roller is completed, the gap between the first screw ring and the second screw ring is changed by tightening the screw, so that a pre-tightening force is generated between the internal threads of the first screw ring and the second screw ring and the external threads of the copper sleeve, thereby realizing locking of the copper sleeve after axial adjustment of the roller shaft assembly, solving the problem that the eccentric roller shaft assembly cannot be locked after axial adjustment on site, and at the same time facilitating operation and maintenance by on-site personnel, reducing the failure rate during use, and extending the service life of the copper sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The diagram is a schematic diagram of the internal structure of a multi-roller star-shaped precision rolling mill whose eccentric sleeve gap can be adjusted at any time.

[0037] Figure 2This is a schematic diagram of the enlarged structure at point A.

[0038] Figure 3 It is a schematic diagram of the cross-sectional structure of the eccentric roller shaft assembly.

[0039] Figure 4 It is a schematic diagram of the cross-sectional structure of the eccentric sleeve assembly.

[0040] Figure 5 It is a schematic diagram of the three-dimensional structure of the eccentric sleeve assembly.

[0041] Figure 6 It is a schematic diagram of the cross-sectional structure of the roller shaft assembly.

[0042] Figure 7 It is a schematic diagram of the cross-sectional structure of the locking nut assembly.

[0043] Figure 8 Schematic diagram of the three-dimensional structure of the locking nut assembly.

[0044] Among them, 1. shell; 2. eccentric roller shaft assembly; 3. eccentric support sleeve; 4. thrust bearing; 5. ball head adjustment screw; 6. roller; 7. rolling groove; 8. flange; 9. mounting threaded through hole; 10. groove; 11. eccentric sleeve assembly; 12. roller shaft assembly; 13. locking nut assembly; 14. intermediate eccentric sleeve; 15. eccentric bearing sleeve; 16. mounting plate; 17. connecting block; 18. lubricating oil channel; 19. long shaft; 20. bevel gear sleeve; 21. annular mounting step; 22. copper sleeve; 23. locking ring; 24. rotating bearing; 25. waterproof sleeve; 26. first screw ring; 27. second screw ring; 28. cylindrical pin; 29. ​​screw; 30. annular groove; 31. positioning hole; 32. threaded locking piece; 33. positioning pin; 34. oil nozzle; 35. wear-resistant steel sleeve. DETAILED DESCRIPTION

[0045] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0046] like Figures 1 to 8 As shown, the present invention provides a multi-roller star-shaped precision rolling mill with adjustable eccentric sleeve gap at any time, which includes a shell 1, in which three groups of eccentric roller shaft assemblies 2 arranged in a star shape at the same angle are arranged; a thrust bearing 4 is arranged at the contact point between the eccentric support sleeve 3 in the eccentric roller shaft assembly 2 and the shell 1, and a plurality of ball head adjustment screws 5 for contacting the upper end surface of the thrust bearing 4 are arranged on the eccentric support sleeve 3.

[0047] like Figure 2 As shown, preferably but not limitedly, a flange 8 is provided on the circumferential outer wall of one side of the eccentric support sleeve 3, and a plurality of mounting threaded through holes 9 for threadedly mating with a plurality of ball head adjustment screws 5 are provided on the flange 8; the plurality of mounting threaded through holes 9 are evenly arranged in an annular direction along the central axis of the flange 8.

[0048] Each mounting threaded through hole 9 matches a ball head adjusting screw 5; the upper end surface of the thrust bearing 4 is provided with a plurality of grooves 10 for cooperating with the ends of the plurality of ball head adjusting screws 5. The setting of the grooves 10 makes the contact between the ball head adjusting screw 5 and the upper end surface of the thrust bearing 4 more stable, thereby avoiding the ball head adjusting screw 5 from sliding on the upper end surface of the thrust bearing 4 when the ball head adjusting screw 5 is tightened with a wrench with a fixed torque.

[0049] Each eccentric roller shaft assembly 2 is provided with a roller 6 located inside the shell 1, and the circumferential outer walls of the multiple rollers 6 are provided with rolling grooves 7 with a circular arc cross-section. The central angle corresponding to the arc of the rolling groove 7 is 120°, and three rolling grooves 7 surround a rolling hole for rolling the rolled piece.

[0050] Each eccentric roller shaft assembly 1 is provided with a locking nut assembly 13 for axial displacement of the eccentric roller shaft assembly 2 .

[0051] The basic principle of the multi-roller star-shaped precision rolling mill in the present scheme in which the clearance of the eccentric sleeve can be adjusted at any time is as follows: when the eccentric roller shaft assembly 2 is adjusted axially, each time the eccentric roller shaft assembly 2 is replaced, the ball head adjusting screw 5 is tightened with a wrench with a fixed torque, and the ball head adjusting screw 5 cooperates with the groove 10 on the end face of the thrust bearing. Since the ball head adjusting screw 5 pushes against the thrust bearing, if there is a small axial clearance between the thrust bearing and the housing 1 axially and the position where the eccentric support sleeve 3 and the housing 1 are in contact is unevenly processed, the reaction force of the thrust bearing on the ball head adjusting screw 5 can be applied to the flange of the eccentric support sleeve 3 through the reaction force of the thrust bearing, so as to drive the eccentric roller shaft assembly 2 to move backward to eliminate the axial clearance and realize the leveling of the eccentric roller shaft assembly 2, so as to make the eccentric roller shaft assembly 2 has stable rotation, thereby achieving the purpose of solving the axial roller shifting of the roller 6 in the eccentric roller shaft assembly 2. The adjustment operation is simple and convenient by tightening symmetrically with a fixed torque, without wasting time and without jamming. At the same time, a locking nut assembly 13 for adjusting the axial displacement of the eccentric roller shaft assembly 2 is provided. The axial displacement of the eccentric roller shaft assembly 2 is adjusted by the locking nut assembly 13, thereby adjusting the axial displacement of the roller 6 on the eccentric roller shaft assembly 2, meeting the need for frequent axial rotation of the eccentric roller shaft assembly 2 during the use of the multi-roller star-shaped precision rolling mill. Through this design, the stability of the rolled products of the multi-roller star-shaped rolling mill is further improved, the dimensional accuracy of the rolled products is greatly improved, and the service life of the rolling mill is extended.

[0052] like Figure 3 As shown, as a specific arrangement of the eccentric roller shaft assembly 2, each group of eccentric roller shaft assembly 2 includes an eccentric sleeve assembly 11 and a roller shaft assembly 12 arranged inside the eccentric sleeve assembly 11, and the tail of the roller shaft assembly 12 is fixedly connected to the eccentric sleeve assembly 11 through a locking nut assembly 13.

[0053] like Figure 4-5 As shown, specifically, the eccentric sleeve assembly 11 includes an intermediate eccentric sleeve 14, and an eccentric bearing sleeve 15 and an eccentric support sleeve 3 are respectively arranged at both ends of the intermediate eccentric sleeve 14; the intermediate eccentric sleeve 14 and the eccentric bearing sleeve 15 are detachably connected through a support plate assembly; the roller 6 is arranged between the intermediate eccentric sleeve 14 and the eccentric bearing sleeve 15. The support plate assembly includes two mounting plates 16 respectively connected to the inner end faces of the intermediate eccentric sleeve 14 and the eccentric bearing sleeve 15, each mounting plate 16 is eccentrically provided with a circular through hole, and the axis of the circular through hole coincides with the axis of the intermediate eccentric sleeve 14 and the eccentric bearing sleeve 15; the tops of the two mounting plates 16 are fixedly connected by a connecting block 17, and the connecting block 17 is provided with a lubricating oil channel 18; the roller 6 is arranged between the two mounting plates 16. The arrangement of the support plate assembly, firstly, realizes the connection between the intermediate eccentric sleeve 14 and the eccentric bearing sleeve 15, and secondly, facilitates disassembly, thereby realizing the disassembly and assembly of the roller 6.

[0054] like Figure 6 As shown, the roller shaft assembly 12 includes a long shaft 19 disposed in the eccentric sleeve assembly 11, and one end of the long shaft 19 is connected to the bevel gear sleeve 20 in the eccentric support sleeve 3;

[0055] An annular mounting step 21 and a copper sleeve 22 are provided on the circumferential outer wall of the long shaft 19, and the copper sleeve 22 is connected to the circumferential outer wall of the long shaft 19 through the annular mounting step 21 and the locking ring 23;

[0056] A rotating bearing 24 is arranged in the copper sleeve 22, and the inner ring of the rotating bearing 24 is fixedly connected to the circumferential outer wall of the long shaft 19;

[0057] A waterproof sleeve 25 is provided inside one side of the copper sleeve 22, and the waterproof sleeve 25 is sleeved on the circumferential outer wall of the long shaft 19;

[0058] After the roller shaft assembly 12 is matched with the eccentric sleeve assembly 11, the copper sleeve 22 is located inside the eccentric support sleeve 3 and is locked by the locking nut assembly 13. The copper sleeve 22 is provided for threaded matching with the locking nut assembly 13. Under the cooperation of the locking nut assembly 13 and the copper sleeve 22, the long shaft 19 and the eccentric sleeve assembly 11 are matched and fixed.

[0059] like Figures 7-8As shown in the figure, as a specific way of locking the copper sleeve 22 with the locking nut assembly 13, the locking nut assembly 13 is arranged at the tail end of the roller shaft assembly 12 and is fixedly connected to the outer end surface of the eccentric support sleeve 3. The locking nut assembly 13 includes a first spiral ring 26 and a second spiral ring 27 with the same inner diameter and both provided with internal threads. A plurality of cylindrical pins 28 are arranged between the first spiral ring 26 and the second spiral ring 27, and a gap is arranged between the two inner end surfaces of the first spiral ring 26 and the second spiral ring 27.

[0060] An oil nozzle 34 is arranged on the end face of the second screw ring 27, and an oil circuit connected to the oil nozzle 34 is arranged inside the first screw ring 26 and the second screw ring 27. The lubricating oil can directly reach the surface of the inner thread of the first screw ring 26 and the second screw ring 27 for lubrication through the oil nozzle 34 and the oil circuit.

[0061] A screw 29 is provided on the end surface of the first screw ring 26 , and the screw 29 passes through the first screw ring 26 and is threadedly connected to the second screw ring 27 ; the first screw ring 26 and the second screw ring 27 are threadedly matched with the external thread of the copper sleeve 22 .

[0062] The purposes of providing multiple cylindrical pins 28 are: first, to ensure that the rotation directions of the internal threads of the first screw ring 26 and the second screw ring 27 can be connected with the starting angles of the external threads on the circumferential outer wall of the copper sleeve 22; when the locking nut assembly 13 is rotated, there will be no relative rotation between the first screw ring 26 and the second screw ring 27; if there is relative rotation between the first screw ring 26 and the second screw ring 27, the internal threads of the first screw ring 26 and the second screw ring 27 are inconsistent, and when they cooperate with the external threads on the circumferential outer wall of the copper sleeve 22, they will become stuck and cannot be adjusted; second, to ensure that there is enough clearance between the first screw ring 26 and the second screw ring 27.

[0063] The purpose of setting the screw 29 is to provide a pre-tightening force between the first screw ring 26 and the second screw ring 27. During use, the screw 29 is tightened and loosened by a wrench to lock. When locking, since the screw 29 connects the first screw ring 26 and the second screw ring 27 together, tightening the screw 29 will generate a pre-tightening force, which reduces the gap between the first screw ring 26 and the second screw ring 27, eliminates the gap between the threads, and always maintains a large pre-tightening force to achieve locking with the external thread of the copper sleeve 22, avoiding the first screw ring 26 and the second screw ring 27 from loosening. The size of the pre-tightening force can be adjusted according to the torque of the wrench of the screw 29, and the locking effect is more ideal, which can meet a wide range of adjustments. When it is necessary to rotate and adjust the first screw ring 26 and the second screw ring 27, it is only necessary to loosen the screw 29, the pre-tightening force disappears, and the first screw ring 26 and the second screw ring 27 can be rotated and adjusted. At the same time, the outer diameter of the first spiral ring 26 is smaller than the outer diameter of the second spiral ring 27; the circumferential inner wall of the eccentric support sleeve 3 is provided with an assembly step connected to its end face; the outer side surface of the first spiral ring 26 cooperates with the assembly step; the second spiral ring 27 is provided with a plurality of waist-shaped annular grooves 30 and positioning holes 31, and the plurality of annular grooves 30 are arranged annularly with the axis of the second spiral ring 27 as the center, and the corresponding center of each annular groove 30 coincides with the center of the second spiral ring 27;

[0064] The end surface of the eccentric support sleeve 3 is provided with a threaded locking member 32 for cooperating with the plurality of annular grooves 30 and a positioning pin 33 for cooperating with the positioning hole 31 ; the inner end surface of the second screw ring 27 contacts the end surface of the eccentric support sleeve 3 .

[0065] When the eccentric roller shaft assembly 2 needs to be adjusted axially, the first screw ring 26 and the second screw ring 27 are screwed, and the first screw ring 26 and the second screw ring 27 drive the roller shaft assembly to move axially, so that the roller shaft assembly 12 is axially displaced relative to the eccentric sleeve assembly 11, thereby realizing axial adjustment of the roller 6 in the roller shaft assembly 12; after the axial displacement adjustment of the roller 6 is completed, the gap between the first screw ring 26 and the second screw ring 27 is changed by tightening the screw 29, so that a pre-tightening force is generated between the internal threads of the first screw ring 26 and the second screw ring 27 and the external threads of the copper sleeve 22, thereby realizing the locking of the roller shaft assembly 12 in the position after axial adjustment, solving the problem that the eccentric roller shaft assembly 1 cannot be locked after axial adjustment on site, and at the same time facilitating the operation and maintenance of on-site personnel, reducing the failure rate during use, and extending the service life of the copper sleeve 22.

[0066] The second screw ring 27 is fixedly connected to the eccentric support sleeve 3 through a plurality of waist-shaped annular grooves 30 and positioning holes 31 respectively with threaded locking members 32 and positioning pins 33, so as to enable the first screw ring 26 and the second screw ring 27 to rotate at a certain angle, thereby facilitating the locking and disassembly of the first screw ring 26 and the second screw ring 27.

[0067] Preferably, a wear-resistant steel sleeve 35 is embedded on the end surface of the copper sleeve 22 close to the annular mounting step 21, and the center of the wear-resistant steel sleeve 35 coincides with the center of the copper sleeve 22. This solves the problem of direct contact with the copper sleeve 22 when the tooling is used to adjust the roller shaft assembly 12 axially, thereby preventing the copper sleeve 22 from being deformed and damaged and extending its service life.

[0068] At the same time, the locking method of the copper sleeve and the locking nut is optimized. In the prior art, such as Chinese patent CN201821863469.8, a star-shaped multi-roller adjustable precision rolling mill, the thread gap is locked by using screws and top nuts through the threaded holes on the copper sleeve flange to eliminate the thread gap. The pre-tightening force that eliminates the thread gap reacts on the flange end face of the thread through the thread, so the threaded hole of the copper sleeve flange is easily damaged; and the present invention optimizes the design and eliminates the flange by providing an external thread on the copper sleeve 22. The copper sleeve 22 is locked by the connecting screw 2 on the locking nut assembly 13 9 Tightening generates a pre-tightening force to reduce the gap between the first screw ring 26 and the second screw ring 27 to eliminate the gap in the thread for locking, which solves the problem that the eccentric roller shaft assembly 2 cannot be locked after axial adjustment on site, and is convenient for on-site personnel to operate and maintain, reduces the failure rate during use, and extends the service life of the copper sleeve 22; the locking nut assembly 13 is fixed on the eccentric support sleeve 3 of the eccentric sleeve assembly 11, and no reaction force is generated on the copper sleeve 22; at the same time, an oil nozzle 34 and an oil circuit are provided on the locking nut assembly 13 to lubricate the thread, thereby extending the service life of the copper sleeve 22.

Claims

1. A multi-roller star-shaped precision rolling mill with adjustable eccentric sleeve gap, characterized in that: It comprises a shell, in which a plurality of eccentric roller shaft assemblies arranged in a star shape and at the same angle are arranged; A thrust bearing is provided at the contact point between the eccentric support sleeve and the housing in the eccentric roller shaft assembly, and a plurality of ball head adjustment screws for contacting the upper end surface of the thrust bearing are provided on the eccentric support sleeve; Each eccentric roller shaft assembly is provided with a roller located inside the shell, and the circumferential outer walls of the plurality of rollers are provided with rolling grooves with a circular arc cross section, and the plurality of rolling grooves enclose a rolling hole for rolling the rolled piece; Each eccentric roller shaft assembly is provided with a locking nut assembly for axial displacement of the eccentric roller shaft assembly; Each set of the eccentric roller shaft assembly comprises an eccentric sleeve assembly and a roller shaft assembly arranged inside the eccentric sleeve assembly, and the tail of the roller shaft assembly is fixedly connected to the eccentric sleeve assembly through the locking nut assembly; the roller shaft assembly comprises the roller; The eccentric sleeve assembly comprises a middle eccentric sleeve, and the two ends of the middle eccentric sleeve are respectively provided with an eccentric bearing sleeve and the eccentric support sleeve; The middle eccentric sleeve and the eccentric bearing sleeve are detachably connected via a support plate assembly; the roller is arranged between the middle eccentric sleeve and the eccentric bearing sleeve; The roller shaft assembly includes a long shaft arranged in the eccentric sleeve assembly, and one end of the long shaft is connected to the bevel gear sleeve in the eccentric bearing sleeve; An annular mounting step and a copper sleeve are provided on the circumferential outer wall of the long shaft, and the copper sleeve is connected to the circumferential outer wall of the long shaft through the annular mounting step and the locking ring; A rotating bearing is arranged in the copper sleeve, and the inner ring of the rotating bearing is fixedly connected to the circumferential outer wall of the long shaft; A waterproof sleeve is provided inside one side of the copper sleeve, and the waterproof sleeve is sleeved on the circumferential outer wall of the long shaft; After the roller shaft assembly is matched with the eccentric sleeve assembly, the copper sleeve is located inside the eccentric support sleeve and is locked by the locking nut assembly; The locking nut assembly comprises a first spiral ring and a second spiral ring having the same inner diameter and both provided with internal threads, a plurality of cylindrical pins are provided between the first spiral ring and the second spiral ring, and a gap is provided between two inner end surfaces of the first spiral ring and the second spiral ring; A screw is arranged on the end surface of the first screw ring, and the screw passes through the first screw ring and is threadedly connected with the second screw ring; the first screw ring and the second screw ring are threadedly matched with the external thread of the copper sleeve; The outer diameter of the first spiral ring is smaller than the outer diameter of the second spiral ring; The circumferential inner wall of the eccentric support sleeve is provided with an assembly step connected to its end face; The outer side surface of the first spiral ring is matched with the assembly step; The second spiral ring is provided with a plurality of waist-shaped annular grooves and positioning holes, wherein the plurality of annular grooves are arranged in an annular direction with the axis of the second spiral ring as the center, and the center of each annular groove coincides with the center of the second spiral ring; The end surface of the eccentric support sleeve is provided with a threaded locking piece for cooperating with a plurality of annular grooves and a positioning pin for cooperating with the positioning hole; the inner end surface of the second screw ring contacts the end surface of the eccentric support sleeve.

2. The multi-roller star-shaped precision rolling mill with adjustable eccentric sleeve gap according to claim 1 is characterized in that: A flange is provided on the circumferential outer wall of one side of the eccentric support sleeve, and a plurality of mounting threaded through holes for threadably cooperating with a plurality of the ball head adjusting screws are provided on the flange; Each of the mounting threaded through holes is matched with a ball head adjustment screw; The upper end surface of the thrust bearing is provided with a plurality of grooves for matching with the ends of a plurality of ball head adjusting screws.

3. The multi-roller star-shaped precision rolling mill with adjustable eccentric sleeve gap according to claim 1, characterized in that: The support plate assembly comprises two mounting plates respectively connected to the inner end faces of the middle eccentric sleeve and the eccentric bearing sleeve, each mounting plate is eccentrically provided with a circular through hole, and the axis of the circular through hole coincides with the axis of the middle eccentric sleeve and the eccentric bearing sleeve; The tops of the two mounting plates are fixedly connected by a connecting block, and a lubricating oil channel is provided on the connecting block; The roller is arranged between two mounting plates.

4. The multi-roller star-shaped precision rolling mill with adjustable eccentric sleeve gap according to claim 1, characterized in that: An oil nozzle is arranged on the end surface of the second spiral ring, and oil passages communicating with the oil nozzle are arranged inside the first spiral ring and the second spiral ring.

5. The multi-roller star-shaped precision rolling mill with adjustable eccentric sleeve gap according to claim 1, characterized in that: A wear-resistant steel sleeve is embedded on the end surface of the copper sleeve close to the annular installation step, and the center of the wear-resistant steel sleeve coincides with the center of the copper sleeve.

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