Segmented telescopic roller for Pilger mill

Abstract

The invention belongs to the technical field of seamless tube rolling, and particularly relates to a segmented telescopic roller for a Pilger mill, which comprises a rim, a roller shaft assembly and a hydraulic transmission assembly, the wheel flange is uniformly divided into a plurality of fan-shaped wheel flange units; the roll shaft assembly comprises a rotating shaft, a shaft sleeve and a shaft sleeve cover; the hydraulic transmission assembly is arranged between the wheel flanges and the roller shaft assembly and comprises a hub, and the hub is provided with corresponding hydraulic units corresponding to the wheel flange units. According to the roller for the Pilger mill, the roller is arranged into the wheel flanges, the wheel shaft assemblies and the hydraulic transmission assemblies in a split mode, a hydraulic system is formed through cooperation of the wheel shaft assemblies and the hydraulic transmission assemblies, and the hydraulic system is used for providing telescopic power for each wheel flange unit in the wheel flanges; therefore, workers can accurately replace the abraded rim unit, waste of production cost caused by overall scrapping of the roller is avoided, and meanwhile the capacity of changing the model of a product output by the Pilger mill by replacing the rim unit is considered.

Description

Technical Field

[0001] The invention belongs to the technical field of seamless pipe rolling, and in particular relates to a segmented telescopic roller for a pilger rolling mill. Background Art

[0002] At present, traditional pilger rolling mills at home and abroad all use one-piece variable-section rolls, which are quite mature in preparation. The rolls have periodic hole grooves, which are used to roll the rough tube with an inserted mandrel into a steel pipe. In addition, the overall circumferential outer surface of the roll is divided into a working part and a rotating part. The working part is provided with hole grooves whose cross-sections change according to a certain rule, and the hole grooves are used to perform periodic rolling on the rough tube during rolling; the rotating part does not contact the rough tube at all times during rolling, and is used to rotate and feed the rough tube between periodic rolling.

[0003] Therefore, in the actual working environment, the roller surface of the working part is subjected to heavy work load and is severely worn, while the rest of the roller does not wear and can still be used. Therefore, when the roller surface of the working part is worn to a certain extent, the roller can only be scrapped as a whole due to its one-piece design, which greatly increases the production cost. At the same time, since the one-piece roller has only a fixed hole shape, it is not universal for rolling pipes of different specifications and materials. Therefore, it is necessary to increase the number of spare rollers of different specifications and materials, which further increases the production cost. Summary of the invention

[0004] The object of the present invention is to provide a segmented retractable roller for a pilger mill, aiming to overcome the defects of the original one-piece roller design, such as high replacement cost and inability to be applicable to rolling of pipes of multiple specifications.

[0005] In order to solve the above problems, the technical solutions provided by the present invention are as follows: A segmented retractable roller for a pilger rolling mill, characterized by comprising: The wheel rim is in a circular shape as a whole, and is evenly divided into a plurality of fan-shaped wheel rim units; A roller shaft assembly, comprising a rotating shaft, the rotating shaft is composed of an integrally formed transmission part and a working part, the transmission part is provided with a keyway for connecting with the main transmission shaft of the pilger rolling mill, the working part is sleeved with a shaft sleeve and a shaft sleeve cover, wherein the shaft sleeve comprises a mounting part and a first buckling part, the mounting part is provided with an oil separator along its circumferential outer wall, the first buckling part is integrally connected with one end of the mounting part through a first connecting part, a first oil port is also provided on the first connecting part, the shaft sleeve cover comprises an integrally arranged second buckling part and a second connecting part, and the shaft sleeve cover is bolted to the other end of the mounting part through the second connecting part, a second oil port is also provided on the second connecting part, based on the above structure, when the shaft sleeve and the shaft sleeve cover cooperate with each other and are installed on the working part of the rotating shaft, the second buckling part and the second connecting part on the shaft sleeve cover and the first buckling part and the first connecting part on the shaft sleeve are symmetrical with respect to the oil separator in terms of spatial structure; A hydraulic transmission assembly is arranged between the wheel rim and the roller assembly, and the hydraulic transmission assembly includes a wheel hub in an annular shape as a whole, and an annular groove is correspondingly provided on the two side surfaces of the wheel hub, and the two annular grooves are respectively matched with the first buckle part and the second buckle part, at this time, the top of the oil separator is in contact with the inner circumference of the wheel hub, and the oil separator separates the gap between the wheel hub and the shaft sleeve and the shaft sleeve cover into a first cavity and a second cavity which are not connected to each other, and the first oil port is connected to the first cavity, and the second oil port is connected to the second cavity; In addition, a corresponding hydraulic unit is arranged on the wheel hub corresponding to each wheel rim unit, and each hydraulic unit includes a hydraulic chamber opened on the wheel hub, the top opening direction of the hydraulic chamber coincides with the radial direction of the wheel hub, and a cover plate is fixedly arranged at the top opening of the hydraulic chamber, a through hole is arranged in the middle of the cover plate, a piston rod is slidably connected to the inside of the through hole, one end of the piston rod extends out of the hydraulic chamber and is connected to the wheel rim unit through a connecting plate, and a piston plate is integrally arranged on the other end of the piston rod, the piston plate is in contact with the inner wall of the hydraulic chamber, and divides the hydraulic chamber into a first oil chamber and a second oil chamber which are independent of each other and are in an upper and lower structure along the radial direction of the wheel hub, on this basis On the basis, each hydraulic unit also includes a first oil circuit and a second oil circuit which are independent of each other inside the wheel hub, the first oil circuit connects the first cavity with the first oil cavity, and the second oil circuit connects the second cavity with the second oil cavity, when the roller passes hydraulic oil into the first cavity through the first oil port, and the hydraulic oil enters the first oil cavity in each hydraulic unit through the first oil circuit, the piston rod will start from the initial state together with the wheel rim unit and move in the radial direction of the wheel hub toward the direction away from the rotating shaft; when the roller passes hydraulic oil into the second cavity through the second oil port, and the hydraulic oil enters the second oil cavity in each hydraulic unit through the second oil circuit, the piston rod will retreat to the initial state together with the wheel rim unit.

[0006] Preferably, in the rim, each rim unit includes a rim outer circumferential surface, a rim side wall and a rim inner circumferential surface, and a hole groove is opened on the rim outer circumferential surface of each rim unit. The hole grooves on several rim units are combined to constitute the rolling structure of the rollers in the pilger mill.

[0007] More preferably, in each of the rim units, a rim connecting groove is provided on the inner circumferential surface of the rim, and the inner circumferential surface of the rim and the rim side wall are connected by a transition slope.

[0008] Furthermore, in the rotating shaft, a connecting key is provided on the working part, and a positioning shoulder is provided at one end of the connecting key. The sleeve and sleeve cover are positioned and installed on the rotating shaft by cooperating with the connecting key and the positioning shoulder. In addition, the working part is threadedly connected with a shaft end retaining ring at the end away from the positioning shoulder, which is used to limit and fix the sleeve, sleeve cover and the rotating shaft when the sleeve and sleeve cover are cooperated and installed on the working part of the rotating shaft.

[0009] Furthermore, in the shaft sleeve, a dynamic sealing ring is installed on the side of the oil separator that is in contact with the inner circumferential surface of the hub through a first sealing groove, and in the shaft sleeve and the shaft sleeve cover, a plurality of second sealing grooves are provided on the first snap-fitting part and the second snap-fitting part, and a dynamic sealing ring is provided in each of the second sealing grooves.

[0010] Preferably, in the wheel hub, a plurality of third sealing grooves are provided inside the annular groove, and a dynamic sealing ring is also provided in each third sealing groove; In addition, in each hydraulic unit on the wheel hub, the cover plate is also equipped with a dynamic sealing ring through a fourth sealing groove at a position where a through hole is preset, which is used to prevent the hydraulic oil in the second oil chamber from leaking from the gap between the through hole and the piston rod when the piston rod slides in the through hole. On this basis, a limiting portion is provided on the circumferential outer wall of the piston rod. In the process when the piston rod moves from an initial state in the hydraulic chamber away from the rotating shaft to the limit portion and the bottom of the cover plate are in contact, the second oil chamber is always connected to the second cavity through the second oil circuit. On this basis, the piston plate is also equipped with a dynamic sealing ring through a fifth sealing groove at a position where it is in contact with the inner wall of the hydraulic chamber.

[0011] More preferably, the connecting piece is placed in a rim connecting groove on the inner circumferential surface of the rim, and the connecting piece is detachably connected to the rim unit by screws. On this basis, the connecting piece is also connected to the end of the piston rod at the same time.

[0012] Furthermore, the hydraulic transmission assembly further comprises a plurality of first bosses uniformly arranged on the outer circumferential surface of the wheel hub, each of the first bosses being in the same axial direction as the wheel hub, and on this basis, the plurality of first bosses uniformly divide the outer circumferential surface of the wheel hub into a plurality of contact surfaces having the same number as the wheel rim units and the same area as the inner circumferential surface of the wheel rim; In addition, second bosses are provided on both sides of the outer circumferential surface of the hub, and when the inner circumferential surface of the rim of each rim unit contacts the contact surface respectively, the transition inclined surface of each rim unit cooperates with the first boss and the second boss respectively. At this time, several rim units are enclosed on the outer circumferential surface of the hub to form a rim.

[0013] Furthermore, the material of each of the wheel rim units is H23.

[0014] The beneficial effects of the present invention are: The roller for the pilger mill provided by the present invention is configured as a wheel rim, an axle assembly and a hydraulic transmission assembly, and a hydraulic system is formed by the cooperation of the axle assembly and the hydraulic transmission assembly. The hydraulic system is used to provide telescopic power for each rim unit in the wheel rim, so that the staff can accurately replace the worn rim unit to avoid the waste of production costs caused by the overall scrapping of the roller. On this basis, through the design of the hole grooves on different rim units, the roller can change the model of the product output by the pilger mill by replacing the rim unit, and the production of the wheel rim replaces the production of the roller as a whole, saving production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the wheel rim in the present invention; Figure 3 It is a schematic diagram of the partial structure of the roller assembly in the present invention; Figure 4 It is a schematic diagram of the specific structure of the rotating shaft in the roller assembly; Figure 5 It is a schematic diagram of the specific structure of the shaft sleeve in the roller assembly; Figure 6 It is a schematic diagram of the specific structure of the shaft sleeve cover in the roller assembly; Figure 7It is a front view structural schematic diagram of the overall coordinated installation of the roller shaft assembly; Figure 8 It is a schematic diagram of the three-dimensional structure of the wheel hub in the hydraulic transmission assembly of the present invention; Fig. 9 It is a schematic diagram of a partial cross-sectional structure of a hub in the radial direction; Fig.10 for Fig. 9 A schematic diagram of the local enlarged structure at point A in the middle; Fig.11 It is a schematic diagram of a partial cross-sectional structure of the overall structure of the roller along the axial direction; In the figure: rim 1, rim unit 101, rim outer circumferential surface 102, rim side wall 103, rim inner circumferential surface 104, hole groove 105, rim connecting groove 106, transition slope 107; roller assembly 2, shaft 4, transmission part 401, working part 402, connecting key 403, positioning shoulder 404, shaft end retaining ring 405, sleeve 5, mounting part 501, first buckling part 502, oil separator 503, first connecting part 504, first oil port 505, sleeve cover 6, second buckling part 601, second connecting part 602, second oil port 603; first cavity 7; second cavity 8; hydraulic transmission assembly 3, wheel hub 301, annular groove 302, wheel hub inner circumference 303, wheel hub outer circumference 304, first boss 305, second boss 306, hydraulic unit 9, hydraulic cavity 901, cover plate 902, through hole 903, piston rod 904, connecting plate 905, piston plate 906, first oil path 907, second oil path 908, limiting portion 909; first oil cavity 10; second oil cavity 11; first sealing groove 12; second sealing groove 13; third sealing groove 14; fourth sealing groove 15; fifth sealing groove 16. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] The technical solution of the present application will be described in detail below with reference to the accompanying drawings.

[0020] The present application provides a segmented retractable roller for a pilger mill, such as Figure 1 As shown, the segmented telescopic roller comprises: a wheel rim 1, a roller shaft assembly 2, and a hydraulic transmission assembly 3, wherein: The rim 1 is in a circular shape as a whole, and is evenly divided into a number of sector-shaped rim units 101. The material of each rim unit 101 is H23. Figure 2 As shown, in this embodiment, the rim 1 is evenly divided into four rim units as an example, wherein each rim unit 101 includes a rim outer circumferential surface 102, a rim side wall 103 and a rim inner circumferential surface 104, and a hole groove 105 is opened on the rim outer circumferential surface 102 of each rim unit 101. The hole grooves 105 on several rim units 101 are combined to form a rolling structure of the roller in the pilger mill. In addition, in each rim unit 101, a rim connecting groove 106 is provided on the rim inner circumferential surface 104, and the rim inner circumferential surface 104 and the rim side wall 103 are connected by a transition slope 107.

[0021] In this technical solution, if Figure 3-7As shown, the roller assembly 2 includes a rotating shaft 4, which is composed of an integrally formed transmission part 401 and a working part 402. The transmission part 401 is provided with a keyway for connecting to the main transmission shaft of the pilger rolling mill, which is not shown in the figure; the working part 402 is sleeved with a shaft sleeve 5 and a shaft sleeve cover 6, wherein the shaft sleeve 5 includes a mounting part 501 and a first buckling part 502, and the mounting part 501 is provided with an oil separator 503 along its circumferential outer wall, the first buckling part 502 is integrally connected to one end of the mounting part 501 through a first connecting part 504, and a first oil port 505 is also provided on the first connecting part 504, and the shaft sleeve cover 6 includes an integrally arranged second buckling part 601 and a second connecting part 602, and the shaft sleeve cover 6 is bolted to the other end of the mounting part 501 through the second connecting part 602, and a second oil port 603 is also provided on the second connecting part 602.

[0022] Based on the above embodiment, when the sleeve 5 and the sleeve cover 6 cooperate with each other and are installed on the working part 402 of the rotating shaft 4, the second snap-fitting part 601 and the second connecting part 602 on the sleeve cover 6 and the first snap-fitting part 502 and the first connecting part 504 on the sleeve 5 are symmetrical with respect to the oil separator 503 in spatial structure.

[0023] In addition, in the rotating shaft 4, as Figure 4 , Figure 7 As shown, a connecting key 403 is provided on the working part 402, and a positioning shoulder 404 is provided at one end of the connecting key 403. The sleeve 5 and the sleeve cover 6 are positioned and installed on the rotating shaft 4 by cooperating with the connecting key 403 and the positioning shoulder 404. On this basis, a shaft end retaining ring 405 is threadedly connected at one end of the working part 402 away from the positioning shoulder 404, which is used to limit and fix the sleeve 5, the sleeve cover 6 and the rotating shaft 4 when the sleeve 5 and the sleeve cover 6 are cooperating and installed on the working part 402 of the rotating shaft 4. The specific installation structure is shown in FIG. Figure 7 shown.

[0024] In this technical solution, if Figure 8-11 As shown, the hydraulic transmission component 3 is arranged between the wheel rim 1 and the roller shaft component 2, and the hydraulic transmission component 3 includes a wheel hub 301 in an overall annular shape, and an annular groove 302 is respectively provided on the two side surfaces of the wheel hub 301, and the two annular grooves 302 are respectively matched with the first buckling portion 502 and the second buckling portion 601. At this time, the top of the oil separator 503 is in contact with the inner circumferential surface 303 of the wheel hub 301, and the oil separator 503 separates the gap between the wheel hub 301 and the shaft sleeve 5 and the shaft sleeve cover 6 into a first cavity 7 and a second cavity 8 that are not connected to each other, and the first oil port 505 is connected to the first cavity 7, and the second oil port 603 is connected to the second cavity 8.

[0025] It should be noted that if Figure 9-11As shown, a corresponding hydraulic unit 9 is provided on the wheel hub 301 corresponding to each wheel rim unit 101, and each hydraulic unit 9 includes a hydraulic chamber 901 opened on the wheel hub 301, the top opening direction of the hydraulic chamber 901 coincides with the radial direction of the wheel hub 301, and a cover plate 902 is fixedly provided at the top opening of the hydraulic chamber 901, a through hole 903 is provided in the middle of the cover plate 902, a piston rod 904 is slidably connected inside the through hole 903, and one end of the piston rod 904 extends out of the hydraulic chamber 901 and is connected to the wheel rim unit 101 through a connecting piece 905. Then, the other end of the piston rod 904 is integrally provided with a piston plate 906, which fits against the inner wall of the hydraulic chamber 901 and divides the hydraulic chamber 901 into a first oil chamber 10 and a second oil chamber 11 which are independent of each other and are in an upper and lower structure along the radial direction of the wheel hub 301. On this basis, each hydraulic unit 9 also includes a first oil circuit 907 and a second oil circuit 908 which are independent of each other inside the wheel hub 301. The first oil circuit 907 connects the first cavity 7 with the first oil chamber 10, and the second oil circuit 908 connects the second cavity 8 with the second oil chamber 11.

[0026] Based on the above structure, when the roller introduces hydraulic oil into the first cavity 7 through the first oil port 505, and the hydraulic oil enters the first oil chamber 10 in each hydraulic unit 9 through the first oil circuit 907, the piston rod 904 will move together with the wheel rim unit 101 from the initial state along the radial direction of the hub 301 toward the direction away from the rotating shaft 4. At this time, the second oil port 603 plays the role of oil discharge, that is, the movement of the piston rod 904 discharges the hydraulic oil in the second oil chamber 11 from the second oil port 603; when the roller introduces hydraulic oil into the second cavity 8 through the second oil port 603, and the hydraulic oil enters the second oil chamber 11 in each hydraulic unit 9 through the second oil circuit 908, the piston rod 904 will retreat to the initial state together with the wheel rim unit 101. At this time, the first oil port 505 plays the role of oil discharge, that is, the movement of the piston rod 904 discharges the hydraulic oil in the first oil chamber 10 from the first oil port 505, and the initial state described in this application is as follows Figure 1 , Fig.11 As shown, it shows a state where a plurality of rim units 101 are tightly closed together to form a rim 1 , and at this time, the rim inner circumferential surface 104 of each rim unit 101 is in contact with the hub outer circumferential surface 304 of the hub 301 .

[0027] In addition, a limit portion 909 is provided on the circumferential outer wall of the piston rod 904. When the piston rod 904 moves from an initial state in the hydraulic chamber 901 in a direction away from the rotating shaft 4 to a state where the limit portion 909 fits with the bottom of the cover plate 902, the second oil chamber 11 is always connected to the second cavity 8 through the second oil passage 908.

[0028] It should be noted that the connecting piece 905 is placed in the rim connecting groove 106 on the inner circumferential surface 104 of the rim, and the connecting piece 905 and the rim unit 101 are detachably connected by screws, thereby realizing the replacement of the rim unit 101 by disassembling the connecting piece 905 and the rim unit 101. On this basis, the connecting piece 905 is also connected to the end of the piston rod 904 at the same time.

[0029] In addition, the hydraulic oil circulating inside the roller assembly 2 and the hydraulic transmission assembly 3 is supplied through the oil pipeline provided by the external hydraulic equipment, and the oil pipeline is respectively connected to the first oil port 505 and the second oil port 603. Since the rollers used in the existing traditional pilger rolling mill are all of an integrated design, the rollers need to rotate as a whole when rolling the pipes. If the rollers provided in the present application continue to use the overall rotation operation scheme of the traditional rollers, the oil pipelines of the hydraulic equipment will be entangled when the rollers rotate, which will cause the oil pipelines to rupture in the long run.

[0030] In order to complete the rolling process of the rolling mill normally while avoiding the occurrence of oil pipeline rupture, the present application designs the operation form of the rolling mill as follows: the roller shaft assembly 2 performs translational motion as a whole, and the hydraulic transmission assembly 3 and the wheel rim 1 can rotate with the rotating shaft 4 as the axis relative to the roller shaft assembly 2, that is, when the rolling mill is running, the rotating shaft 4, the shaft sleeve 5, and the shaft sleeve cover 6 all perform translational motion and do not rotate. At this time, the wheel hub 301 and the wheel rim 1 in the hydraulic transmission assembly 3 rotate with the rotating shaft 4 as the axis, which is specifically reflected in: the two annular grooves 302 respectively cooperate with the first buckling part 502 and the second buckling part 601, and the two annular grooves 302 respectively rotate relative to the first buckling part 502 and the second buckling part 601; the top of the oil separator 503 is in contact with the inner circumferential surface 303 of the hub 301, and the oil separator 503 and the inner circumferential surface 303 of the hub rotate relative to each other.

[0031] Based on the above roller operation mode, since the cooperation between the roller assembly 2 and the hydraulic transmission assembly 3 provides a flow channel for the hydraulic oil, the rotation cooperation between the roller assembly 2 and the components in the hydraulic transmission assembly 3 requires a seal to perform a sealing process, specifically, Figure 10-11As shown, in the shaft sleeve 5, a dynamic sealing ring is installed through the first sealing groove 12 on the side where the oil separator 503 is in contact with the inner circumferential surface 303 of the hub to prevent the first cavity 7 and the second cavity 8 from communicating with each other; in the shaft sleeve 5 and the shaft sleeve cover 6, a plurality of second sealing grooves 13 are arranged on the first buckling part 502 and the second buckling part 601, and a dynamic sealing ring is arranged in each second sealing groove 13 to prevent the hydraulic oil in the first cavity 7 and the second cavity 8 from overflowing from the roller; in the wheel hub 301, a plurality of third sealing grooves 14 are arranged inside the annular groove 302, and a dynamic sealing ring is also arranged in each third sealing groove 14; in addition, in the wheel hub 3 In each hydraulic unit 9 on 01, the cover plate 902 is also equipped with a dynamic sealing ring through the fourth sealing groove 15 at the position where the through hole 903 is preset, which is used to prevent the hydraulic oil in the second oil chamber 11 from leaking from the gap between the through hole 903 and the piston rod 904 when the piston rod 904 slides in the through hole 903; on this basis, the piston plate 906 is also equipped with a dynamic sealing ring through the fifth sealing groove 16 at the position where it fits with the inner wall of the hydraulic chamber 901, so as to prevent the first oil chamber 10 and the second oil chamber 11 from communicating with each other; it should be noted that the dynamic sealing ring is a conventional application of the prior art, and is used for relative sliding and relative rotation sealing in the present application.

[0032] At this point, the roller can carry out normal rolling operations. When the rim 1 of the roller is partially worn or the hole type is changed, all the rim units 101 can be lifted up through the cooperation of the roller shaft assembly 2 and the hydraulic transmission assembly 3, and the worn rim unit 101 or the rim unit 101 with a different hole type can be replaced through the connecting piece 905, avoiding the cost waste of traditional one-piece rollers.

[0033] The roller provided in the present application can be used for rolling when it is in the initial state. Considering the structural strength of the rim 1 and the hub 301 when the roller is in the rolling operation, Figure 8 As shown, the technical solution also has a plurality of first bosses 305 evenly distributed on the outer circumferential surface 304 of the hub, and each first boss 305 is in the same axial direction as the hub 301. On this basis, the plurality of first bosses 305 evenly divide the outer circumferential surface 304 of the hub into a plurality of contact surfaces whose number is the same as that of the rim unit 101 and whose area is the same as that of the inner circumferential surface 104 of the rim; in addition, second bosses 306 are provided on both sides of the outer circumferential surface 304 of the hub.

[0034] Based on the above embodiment, when the inner circumferential surface 104 of the rim of each rim unit 101 is in contact with the contact surface respectively, that is, when the roller is in the initial state, the transition slope 107 of each rim unit 101 is respectively matched with the first boss 305 and the second boss 306. At this time, several rim units 101 are enclosed on the outer circumferential surface 304 of the hub to form a rim 1 to prevent the rim unit 101 from being displaced during the operation of the roller.

[0035] Specifically, the roller for the pilger mill provided in the present application abandons the integrated traditional roller design scheme, and sets the roller separately into a rim 1, an axle assembly 2 and a hydraulic transmission assembly 3, and uses the cooperation of the axle assembly 2 and the hydraulic transmission assembly 3 to form a hydraulic system, and uses the hydraulic system to provide telescopic power for each rim unit 101 in the rim 1, so that the staff can accurately replace the worn rim unit 101, avoiding the waste of production costs caused by the overall scrapping of the roller. On this basis, through the design of the hole groove 105 on different rim units 101, the roller can change the model of the product output by the pilger mill by replacing the rim unit 101, and the production preparation of the rim 1 replaces the production preparation of the roller as a whole, saving production costs.

[0036] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A segmented retractable roller for a pilger mill, characterized in that: include: The wheel rim is in a circular shape as a whole, and is evenly divided into a plurality of fan-shaped wheel rim units; A roller shaft assembly, comprising a rotating shaft, the rotating shaft is composed of an integrally formed transmission part and a working part, the transmission part is provided with a keyway for connecting with the main transmission shaft of the pilger rolling mill, the working part is sleeved with a shaft sleeve and a shaft sleeve cover, wherein the shaft sleeve comprises a mounting part and a first buckling part, the mounting part is provided with an oil separator along its circumferential outer wall, the first buckling part is integrally connected with one end of the mounting part through a first connecting part, a first oil port is also provided on the first connecting part, the shaft sleeve cover comprises an integrally arranged second buckling part and a second connecting part, and the shaft sleeve cover is bolted to the other end of the mounting part through the second connecting part, a second oil port is also provided on the second connecting part, based on the above structure, when the shaft sleeve and the shaft sleeve cover cooperate with each other and are installed on the working part of the rotating shaft, the second buckling part and the second connecting part on the shaft sleeve cover and the first buckling part and the first connecting part on the shaft sleeve are symmetrical with respect to the oil separator in terms of spatial structure; A hydraulic transmission assembly is arranged between the wheel rim and the roller assembly, and the hydraulic transmission assembly includes a wheel hub in an annular shape as a whole, and an annular groove is correspondingly provided on the two side surfaces of the wheel hub, and the two annular grooves are respectively matched with the first buckle part and the second buckle part, at this time, the top of the oil separator is in contact with the inner circumference of the wheel hub, and the oil separator separates the gap between the wheel hub and the shaft sleeve and the shaft sleeve cover into a first cavity and a second cavity which are not connected to each other, and the first oil port is connected to the first cavity, and the second oil port is connected to the second cavity; In addition, a corresponding hydraulic unit is arranged on the wheel hub corresponding to each wheel rim unit, and each hydraulic unit includes a hydraulic chamber opened on the wheel hub, the top opening direction of the hydraulic chamber coincides with the radial direction of the wheel hub, and a cover plate is fixedly arranged at the top opening of the hydraulic chamber, a through hole is arranged in the middle of the cover plate, a piston rod is slidably connected to the inside of the through hole, one end of the piston rod extends out of the hydraulic chamber and is connected to the wheel rim unit through a connecting plate, and a piston plate is integrally arranged on the other end of the piston rod, the piston plate is in contact with the inner wall of the hydraulic chamber, and divides the hydraulic chamber into a first oil chamber and a second oil chamber which are independent of each other and are in an upper and lower structure along the radial direction of the wheel hub, on this basis On the basis, each hydraulic unit also includes a first oil circuit and a second oil circuit which are independent of each other inside the wheel hub, the first oil circuit connects the first cavity with the first oil cavity, and the second oil circuit connects the second cavity with the second oil cavity, when the roller passes hydraulic oil into the first cavity through the first oil port, and the hydraulic oil enters the first oil cavity in each hydraulic unit through the first oil circuit, the piston rod will start from the initial state together with the wheel rim unit and move in the radial direction of the wheel hub toward the direction away from the rotating shaft; when the roller passes hydraulic oil into the second cavity through the second oil port, and the hydraulic oil enters the second oil cavity in each hydraulic unit through the second oil circuit, the piston rod will retreat to the initial state together with the wheel rim unit.

2. The segmented retractable roller for a pilger mill according to claim 1, characterized in that: In the rim, each rim unit includes a rim outer circumferential surface, a rim side wall and a rim inner circumferential surface. A hole groove is opened on the rim outer circumferential surface of each rim unit. The hole grooves on several rim units are combined to form the rolling structure of the rollers in the pilger mill.

3. The segmented retractable roller for a pilger mill according to claim 2, characterized in that: In each of the wheel rim units, a wheel rim connecting groove is provided on the inner circumferential surface of the wheel rim, and the inner circumferential surface of the wheel rim and the wheel rim side wall are connected by a transition slope.

4. The segmented retractable roller for a pilger mill according to claim 3, characterized in that: In the rotating shaft, a connecting key is provided on the working part, and a positioning shoulder is provided at one end of the connecting key. The sleeve and sleeve cover are positioned and installed on the rotating shaft by cooperating with the connecting key and the positioning shoulder. In addition, the working part is threadedly connected with a shaft end retaining ring at the end away from the positioning shoulder, which is used to limit and fix the sleeve, sleeve cover and the rotating shaft when the sleeve and sleeve cover are cooperated and installed on the working part of the rotating shaft.

5. The segmented retractable roller for a pilger mill according to claim 4, characterized in that: In the shaft sleeve, a dynamic sealing ring is installed on the side of the oil separator that is in contact with the inner circumferential surface of the hub through a first sealing groove, and in the shaft sleeve and the shaft sleeve cover, a plurality of second sealing grooves are provided on the first snap-fitting part and the second snap-fitting part, and a dynamic sealing ring is provided in each of the second sealing grooves.

6. The segmented retractable roller for a pilger mill according to claim 5, characterized in that: In the wheel hub, a plurality of third sealing grooves are provided inside the annular groove, and a dynamic sealing ring is also provided in each third sealing groove; In addition, in each hydraulic unit on the wheel hub, the cover plate is also equipped with a dynamic sealing ring through a fourth sealing groove at a position where a through hole is preset, which is used to prevent the hydraulic oil in the second oil chamber from leaking from the gap between the through hole and the piston rod when the piston rod slides in the through hole. On this basis, a limiting portion is provided on the circumferential outer wall of the piston rod. In the process when the piston rod moves from an initial state in the hydraulic chamber away from the rotating shaft to the limit portion and the bottom of the cover plate are in contact, the second oil chamber is always connected to the second cavity through the second oil circuit. On this basis, the piston plate is also equipped with a dynamic sealing ring through a fifth sealing groove at a position where it is in contact with the inner wall of the hydraulic chamber.

7. The segmented retractable roller for a pilger mill according to claim 6, characterized in that: The connecting piece is placed in the wheel rim connecting groove on the inner circumferential surface of the wheel rim, and the connecting piece is detachably connected to the wheel rim unit by screws. On this basis, the connecting piece is also connected to the end of the piston rod at the same time.

8. The segmented retractable roller for a pilger mill according to claim 7, characterized in that: The hydraulic transmission assembly further comprises a plurality of first bosses uniformly arranged on the outer circumferential surface of the wheel hub, each of the first bosses being in the same axial direction as the wheel hub, and on this basis, the plurality of first bosses uniformly divide the outer circumferential surface of the wheel hub into a plurality of contact surfaces having the same number as the wheel rim units and the same area as the inner circumferential surface of the wheel rim; In addition, second bosses are provided on both sides of the outer circumferential surface of the hub, and when the inner circumferential surface of the rim of each rim unit contacts the contact surface respectively, the transition inclined surface of each rim unit cooperates with the first boss and the second boss respectively. At this time, several rim units are enclosed on the outer circumferential surface of the hub to form a rim.

9. The segmented retractable roller for a pilger mill according to claim 8, characterized in that: The material of each wheel rim unit is H23.

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