A segmented telescopic roll for a pilger rolling mill

Abstract

The present invention belongs to the technical field of seamless pipe rolling, and particularly relates to a segmented telescopic roll for a Pilger mill. The roll includes a rim, a roll shaft assembly and a hydraulic drive assembly; the rim is evenly divided into a number of fan-shaped rim units; the roll shaft assembly includes a rotating shaft, a bushing and a bushing cover; the hydraulic drive assembly is disposed between the rim and the roll shaft assembly and includes a hub, and corresponding hydraulic units are provided on the hub corresponding to each rim unit; for the roll for the Pilger mill provided by the present invention, the roll is divided into a rim, a roll shaft assembly and a hydraulic drive assembly, and a hydraulic system is formed by the cooperation of the roll shaft assembly and the hydraulic drive assembly. The hydraulic system provides telescopic power for each rim unit in the rim, so that the staff can accurately replace the worn rim unit, avoiding waste of production costs caused by the overall scrapping of the roll, and at the same time taking into account the ability to change the model of the product output by the Pilger mill by replacing the rim unit.

Description

Technical Field

[0001] The invention belongs to the technical field of seamless pipe rolling, and particularly relates to a segmented telescopic roll for a Pilger mill. Background Art

[0002] At present, traditional Pilger mills at home and abroad all adopt integrally formed variable-section rolls. This kind of roll is quite mature in preparation. The roll has periodic pass grooves for rolling a mandrel-inserted shell 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 pass grooves with cross-sections changing according to a certain law. During rolling, the shell is periodically rolled using the pass grooves; the rotating part never contacts the shell during rolling and is used for rotating and feeding the shell during periodic rolling.

[0003] Therefore, in the actual working environment, the roll surface of the working part of the roll bears a large working load and is severely worn, while the rest of the roll does not wear and can still be used. Therefore, when the roll surface of the working part is worn to a certain extent, due to the integrally formed design of the roll, the roll can only be scrapped as a whole, greatly increasing the production cost; at the same time, since the integral roll has only fixed passes and has no versatility for rolling pipes of different specifications and materials, it is necessary to increase the spare quantity of rolls of different specifications and materials, further increasing the production cost. Summary of the Invention

[0004] The purpose of the invention is to provide a segmented telescopic roll for a Pilger mill, aiming to overcome the defects of high replacement cost and inability to apply to rolling of multi-specification pipes brought by the original integrally formed design of the roll.

[0005] To solve the above problems, the technical solution provided by the invention is as follows:

[0006] A segmented telescopic roll for a Pilger mill, characterized by comprising:

[0007] A rim, which is integrally circular ring-shaped, and the rim is evenly divided into a plurality of fan-shaped rim units;

[0008] Roller assembly, including a rotating shaft, the rotating shaft is composed of an integrally formed transmission part and a working part, a keyway is provided on the transmission part for connecting with the main transmission shaft of the Pilger rolling mill, a bushing and a bushing cover are sleeved on the working part. Among them, the bushing includes an installation part and a first fastening part, an oil separation plate is provided on the circumferential outer wall of the installation part, the first fastening part is integrally connected to one end of the installation part through a first connecting part, and a first oil port is further opened on the first connecting part. The bushing cover includes a second fastening part and a second connecting part which are integrally arranged, and the bushing cover is bolted to the other end of the installation part through the second connecting part, and a second oil port is further opened on the second connecting part. Based on the above structure, when the bushing and the bushing cover are mutually matched and installed on the working part of the rotating shaft, the second fastening part and the second connecting part on the bushing cover and the first fastening part and the first connecting part on the bushing are symmetric with respect to the oil separation plate in the spatial structure;

[0009] A hydraulic transmission assembly is arranged between the rim and the roller assembly. The hydraulic transmission assembly includes a hub that is integrally circular. Annular grooves are respectively provided on the two side surfaces of the hub, and the two annular grooves are respectively matched with the first fastening part and the second fastening part. At this time, the top of the oil separation plate is attached to the inner circumferential surface of the hub of the hub, and the oil separation plate divides the gap between the hub and the bushing and the bushing cover into a non-communicating first cavity and a second cavity. The first oil port communicates with the first cavity, and the second oil port communicates with the second cavity;

[0010] In addition, a corresponding hydraulic unit is provided on the hub corresponding to each rim unit. Each hydraulic unit includes a hydraulic cavity opened on the hub. The top opening direction of the hydraulic cavity coincides with the radial direction of the hub, and a cover plate is fixedly provided at the top opening of the hydraulic cavity. A through hole is provided in the middle of the cover plate, and a piston rod is slidably connected inside the through hole. One end of the piston rod extends out of the hydraulic cavity and is connected to the rim unit through a connecting piece. The other end of the piston rod is integrally provided with a piston piece. The piston piece is attached to the inner wall of the hydraulic cavity and divides the hydraulic cavity into a first oil cavity and a second oil cavity which are vertically structured and independent of each other along the radial direction of the hub. On this basis, each hydraulic unit further includes a first oil passage and a second oil passage that are independent of each other inside the hub. The first oil passage connects the first cavity and the first oil cavity, and the second oil passage connects the second cavity and the second oil cavity. When hydraulic oil is introduced into the first cavity through the first oil port of the rolling mill, and the hydraulic oil enters the first oil cavity of each hydraulic unit through the first oil passage, the piston rod will move along with the rim unit from the initial state in the radial direction of the hub away from the rotating shaft; when the rolling mill introduces hydraulic oil into the second cavity through the second oil port, and the hydraulic oil enters the second oil cavity of each hydraulic unit through the second oil passage, the piston rod will move back to the initial state together with the rim unit.

[0011] Preferably, in the rim, each rim unit includes an outer circumferential surface of the rim, a side wall of the rim, and an inner circumferential surface of the rim. A hole-shaped groove is formed on the outer circumferential surface of each rim unit, and the hole-shaped grooves on a plurality of rim units are combined to form the rolling structure of the roll in the Pilger rolling mill.

[0012] More preferably, in each rim unit, a rim connection groove is provided on the inner circumferential surface of the rim, and the inner circumferential surface of the rim and the side wall of the rim are connected by a transition inclined surface.

[0013] Further, in the rotating shaft, a connection key is provided on the working portion. A positioning shoulder is provided at one end of the connection key. The shaft sleeve and the shaft sleeve cover are positioned and installed on the rotating shaft through cooperation with the connection key and the positioning shoulder. In addition, an end retaining ring is threadedly connected to the working portion of the rotating shaft at the end far from the positioning shoulder, so as to limit and fix the shaft sleeve and the shaft sleeve cover between the shaft sleeve and the rotating shaft when the shaft sleeve and the shaft sleeve cover are cooperatively installed on the working portion of the rotating shaft.

[0014] Even further, in the shaft sleeve, a dynamic seal ring is also installed on one side of the oil separation plate that fits against 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 fastening portion and the second fastening portion, and a dynamic seal ring is provided in each second sealing groove.

[0015] Preferably, in the hub, a plurality of third sealing grooves are provided inside the annular groove, and a dynamic seal ring is also provided in each third sealing groove;

[0016] In addition, in each hydraulic unit on the hub, a dynamic seal ring is also installed on the cover plate at the position where a through hole is provided through a fourth sealing groove, so as 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. During the process that the piston rod moves away from the initial state in the hydraulic chamber to the position where the limiting portion fits against the bottom of the cover plate, the second oil chamber is always communicated with the second cavity through the second oil passage. On this basis, a dynamic seal ring is also installed on the piston piece at the position where it fits against the inner wall of the hydraulic chamber through a fifth sealing groove.

[0017] More preferably, the connecting piece is placed in the rim connection groove on the inner circumferential surface of the rim, and the connecting piece and the rim unit are detachably connected by screws. On this basis, the connecting piece is also connected to the end of the piston rod at the same time.

[0018] Further, the hydraulic transmission assembly further includes a plurality of first bosses evenly arranged on the outer circumferential surface of the hub. Each first boss has the same axial direction as the hub. On this basis, the plurality of first bosses evenly divide the outer circumferential surface of the hub into a plurality of contact surfaces with the same number as the rim units and the same area as the inner circumferential surface of the rim.

[0019] In addition, second bosses are provided on both sides of the outer circumferential surface of the hub. And when the inner circumferential surface of each rim unit is respectively in contact with the contact surfaces, the transition inclined surfaces of each rim unit are respectively matched with the first bosses and the second bosses. At this time, the plurality of rim units enclose to form a rim on the outer circumferential surface of the hub.

[0020] Furthermore, the material of each rim unit is H23.

[0021] The beneficial effects of the present invention are as follows:

[0022] The roll for a Pilger rolling mill provided by the present invention divides the roll into a rim, a roll shaft assembly and a hydraulic transmission assembly in a split manner, and forms a hydraulic system by the cooperation of the roll shaft assembly and the hydraulic transmission assembly. The hydraulic system provides telescopic power for each rim unit in the rim, so that the staff can accurately replace the worn rim unit, avoiding the waste of production cost caused by the scrapping of the whole roll. On this basis, through the design of the hole-shaped grooves on different rim units, the roll can change the model of the product output by the Pilger rolling mill by replacing the rim unit, replacing the production of the whole roll with the production of the rim, and saving the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 is a three-dimensional structure diagram of the rim in the present invention;

[0026] Figure 3 is a partial structure diagram of the roll shaft assembly in the present invention;

[0027] Figure 4 is a specific structure diagram of the rotating shaft in the roll shaft assembly;

[0028] Figure 5It is a schematic structural diagram of the bushing in the roller shaft assembly;

[0029] Figure 6 It is a schematic structural diagram of the bushing cover in the roller shaft assembly;

[0030] Figure 7 It is a front view structural schematic diagram of the overall mating installation of the roller shaft assembly;

[0031] Figure 8 It is a three-dimensional structural schematic diagram of the hub in the hydraulic transmission component of the present invention;

[0032] Figure 9 It is a partial sectional structural schematic diagram in the radial direction of the hub;

[0033] Figure 10 For Figure 9 It is a partial enlarged structural schematic diagram at position A in

[0034] Figure 11 It is a partial sectional structural schematic diagram of the overall structure of the roll along the axial direction;

[0035] In the figure: Rim 1, Rim unit 101, Outer circumferential surface of the rim 102, Side wall of the rim 103, Inner circumferential surface of the rim 104, Groove pattern 105, Rim connection groove 106, Transition inclined surface 107; Roller shaft assembly 2, Rotating shaft 4, Transmission part 401, Working part 402, Connecting key 403, Positioning shoulder 404, Axial end retaining ring 405, Bushing 5, Installation part 501, First fastening part 502, Oil separation plate 503, First connecting part 504, First oil port 505, Bushing cover 6, Second fastening part 601, Second connecting part 602, Second oil port 603; First cavity 7; Second cavity 8; Hydraulic transmission component 3, Hub 301, Annular groove 302, Inner circumferential surface of the hub 303, Outer circumferential surface of the hub 304, First boss 305, Second boss 306, Hydraulic unit 9, Hydraulic cavity 901, Cover plate 902, Through hole 903, Piston rod 904, Connecting piece 905, Piston piece 906, First oil circuit 907, Second oil circuit 908, Limiting part 909; First oil chamber 10; Second oil chamber 11; First sealing groove 12; Second sealing groove 13; Third sealing groove 14; Fourth sealing groove 15; Fifth sealing groove 16. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention; the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside 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.

[0038] The technical solution of this application will be introduced in detail below with reference to the drawings.

[0039] This application provides a segmented telescopic roll for a pilger mill, as Figure 1 shown. The segmented telescopic roll includes: a rim 1, a roll shaft assembly 2, and a hydraulic drive assembly 3, where:

[0040] The rim 1 is integrally circular. The rim 1 is evenly divided into a number of fan-shaped rim units 101. The material of each rim unit 101 is H23. As Figure 2 shown, in this embodiment, the rim 1 is evenly divided into 4 rim units as an example. Among them, each rim unit 101 includes a rim outer circumferential surface 102, a rim side wall 103, and a rim inner circumferential surface 104. A pass groove 105 is provided on the rim outer circumferential surface 102 of each rim unit 101. The pass grooves 105 on a number of rim units 101 combine to form the rolling structure of the roll in the pilger mill. In addition, in each rim unit 101, a rim connection 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 inclined surface 107.

[0041] In this technical solution, as Figures 3 - 7As shown in the figure, the roller shaft assembly 2 includes a rotating shaft 4, which is composed of an integrally formed transmission part 401 and a working part 402. A keyway is provided on the transmission part 401 for connecting with the main transmission shaft of the pilger mill, which is not shown in the figure; a bushing 5 and a bushing cover 6 are sleeved on the working part 402. Among them, the bushing 5 includes an installation part 501 and a first fastening part 502. An oil separation plate 503 is provided on the outer circumferential wall of the installation part 501 along its circumference. The first fastening part 502 is integrally connected to one end of the installation part 501 through a first connecting part 504, and a first oil port 505 is also opened on the first connecting part 504. The bushing cover 6 includes a second fastening part 601 and a second connecting part 602 which are integrally arranged, and the bushing cover 6 is fixedly connected to the other end of the installation part 501 by bolts through the second connecting part 602, and a second oil port 603 is also opened on the second connecting part 602.

[0042] Based on the above embodiment, when the bushing 5 and the bushing cover 6 are fitted with each other and installed on the working part 402 of the rotating shaft 4, the second fastening part 601 and the second connecting part 602 on the bushing cover 6 and the first fastening part 502 and the first connecting part 504 on the bushing 5 are symmetrically arranged with respect to the oil separation plate 503 in terms of spatial structure.

[0043] In addition, in the rotating shaft 4, as Figure 4 , Figure 7 shown, a connection key 403 is provided on the working part 402, and a positioning shoulder 404 is provided at one end of the connection key 403. The bushing 5 and the bushing cover 6 are positioned and installed on the rotating shaft 4 through the cooperation with the connection key 403 and the positioning shoulder 404. On this basis, a shaft end retaining ring 405 is threadedly connected to the end of the working part 402 far from the positioning shoulder 404, which is used to limit and fix the bushing 5, the bushing cover 6 and the rotating shaft 4 when the bushing 5 and the bushing cover 6 are fitted and installed on the working part 402 of the rotating shaft 4. The specific installation structure is as Figure 7 shown.

[0044] In this technical solution, as Figures 8 - 11 shown, the hydraulic transmission assembly 3 is arranged between the wheel rim 1 and the roller shaft assembly 2. The hydraulic transmission assembly 3 includes a hub 301 which is integrally annular. Annular grooves 302 are respectively provided on the two side surfaces of the hub 301, and the two annular grooves 302 are respectively matched with the first fastening part 502 and the second fastening part 601. At this time, the top of the oil separation plate 503 is attached to the inner circumferential surface 303 of the hub of the hub 301, and the oil separation plate 503 divides the gap between the hub 301 and the bushing 5 and the bushing cover 6 into a non-communicating first cavity 7 and a second cavity 8. The first oil port 505 is communicated with the first cavity 7, and the second oil port 603 is communicated with the second cavity 8.

[0045] It should be noted that, as Figures 9 - 11As shown, corresponding to each rim unit 101 on the wheel hub 301, a corresponding hydraulic unit 9 is provided. 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 at the top opening of the hydraulic chamber 901, a cover plate 902 is fixedly provided. 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. One end of the piston rod 904 extends out of the hydraulic chamber 901 and is connected to the rim unit 101 through a connecting piece 905. The other end of the piston rod 904 is integrally provided with a piston piece 906. The piston piece 906 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 vertically structured and independent of each other along the radial direction of the wheel hub 301. On this basis, each hydraulic unit 9 further includes a first oil passage 907 and a second oil passage 908 which are independently opened inside the wheel hub 301. The first oil passage 907 communicates the first cavity 7 with the first oil chamber 10, and the second oil passage 908 communicates the second cavity 8 with the second oil chamber 11.

[0046] Based on the above structure, when the roll passes hydraulic oil into the first cavity 7 through the first oil port 505, and the hydraulic oil enters the first oil chamber 10 of each hydraulic unit 9 through the first oil passage 907, the piston rod 904 will move together with the rim unit 101 from the initial state in the radial direction of the wheel hub 301 away from the rotating shaft 4. At this time, the second oil port 603 functions as an oil outlet, 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 roll passes hydraulic oil into the second cavity 8 through the second oil port 603, and the hydraulic oil enters the second oil chamber 11 of each hydraulic unit 9 through the second oil passage 908, the piston rod 904 will move back together with the rim unit 101 to the initial state. At this time, the first oil port 505 functions as an oil outlet, 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 Figure 1 、 Figure 11 shown, which represents the state where several rim units 101 are closely joined together to form the rim 1. At this time, the inner circumferential surface 104 of the rim of each rim unit 101 fits against the outer circumferential surface 304 of the wheel hub 301.

[0047] In addition, a limiting portion 909 is provided on the circumferential outer wall of the piston rod 904. During the process that the piston rod 904 moves away from the rotating shaft 4 from the initial state in the hydraulic chamber 901 until the limiting portion 909 fits against the bottom of the cover plate 902, the second oil chamber 11 is always communicated with the second cavity 8 through the second oil passage 908.

[0048] 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 is detachably connected to the rim unit 101 by screws. Thus, when the connecting piece 905 and the rim unit 101 are disassembled, the replacement of the rim unit 101 is realized. On this basis, the connecting piece 905 is also connected to the end of the piston rod 904.

[0049] In addition, the hydraulic oil flowing inside the roller shaft assembly 2 and the hydraulic transmission assembly 3 is supplied by an oil delivery pipe provided by an external hydraulic device. The oil delivery pipe is respectively connected to the first oil port 505 and the second oil port 603. Since the rollers of the existing traditional Pilger rolling mill are all integrally designed, the rollers need to rotate as a whole when rolling the pipes. If the rollers provided in this application follow the overall rotation operation scheme of the traditional rollers, the oil delivery pipes of the hydraulic device will be entangled when the rollers rotate. In the long run, phenomena such as the rupture of the oil delivery pipes will occur.

[0050] In order to be able to complete the rolling process of the rollers normally and at the same time avoid the occurrence of the phenomenon of the rupture of the oil delivery pipes, the operation form of the rollers in this application is designed as follows: the roller shaft assembly 2 as a whole performs a translation movement, and the hydraulic transmission assembly 3 and the rim 1 can perform a rotational movement around the rotating shaft 4 relative to the roller shaft assembly 2. That is, when the rollers are operating, the rotating shaft 4, the shaft sleeve 5, and the shaft sleeve cover 6 all perform translation movements and do not rotate. At this time, the hub 301 in the hydraulic transmission assembly 3 and the rim 1 rotate around the rotating shaft 4. Specifically, on the basis that the two annular grooves 302 are respectively matched with the first fastening part 502 and the second fastening part 601, the two annular grooves 302 respectively rotate relative to the first fastening part 502 and the second fastening part 601; on the basis that the top of the oil separation plate 503 is attached to the inner circumferential surface 303 of the hub of the hub 301, the oil separation plate 503 rotates relative to the inner circumferential surface 303 of the hub.

[0051] Based on the above operation form of the rollers, since the cooperation between the roller shaft assembly 2 and the hydraulic transmission assembly 3 provides a flow channel for the hydraulic oil, the rotational cooperation of the various components in the roller shaft assembly 2 and the hydraulic transmission assembly 3 needs to be sealed by a sealing member. Specifically, such as Figures 10 - 11As shown, in the bushing 5, a dynamic seal ring is installed on one side of the oil separation plate 503 that fits against the inner circumferential surface 303 of the hub to prevent the first cavity 7 from communicating with the second cavity 8; in the bushing 5 and the bushing cover 6, a number of second seal grooves 13 are provided on both the first fastening portion 502 and the second fastening portion 601, and a dynamic seal ring is provided in each second seal groove 13 to prevent the hydraulic oil in the first cavity 7 and the second cavity 8 from overflowing the roll; in the hub 301, a number of third seal grooves 14 are provided inside the annular groove 302, and a dynamic seal ring is also provided in each third seal groove 14; in addition, in each hydraulic unit 9 on the hub 301, a dynamic seal ring is also installed through a fourth seal groove 15 at the position where the cover plate 902 is provided with a preset through hole 903, so as to prevent the hydraulic oil in the second oil cavity 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, a dynamic seal ring is also installed through a fifth seal groove 16 at the position where the piston piece 906 fits against the inner wall of the hydraulic cavity 901 to prevent the first oil cavity 10 from communicating with the second oil cavity 11; it should be noted that the dynamic seal ring is a conventional application of the prior art and is used for the sealing situations of relative sliding and relative rotation in this application.

[0052] Thus, on the basis that the roll can perform normal rolling operations, when the rim 1 of the roll is locally worn or the pass is replaced, all the rim units 101 can be lifted through the cooperation of the roll shaft assembly 2 and the hydraulic drive assembly 3, and then the worn rim unit 101 or the rim unit 101 with different passes can be replaced through the connecting piece 905, avoiding the cost waste of traditional integral rolls.

[0053] When the roll provided by this application is in the initial state, it can perform rolling operations. Considering the structural strength of the cooperation between the rim 1 and the hub 301 when the roll performs rolling operations, as Figure 8 shown, a number of first bosses 305 are evenly distributed on the outer circumferential surface 304 of the hub, and each first boss 305 has the same axial direction as the hub 301. On this basis, the number of first bosses 305 evenly divides the outer circumferential surface 304 of the hub into a number of contact surfaces that are the same as the number of rim units 101 and have the same area as 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.

[0054] Based on the above embodiments, when the inner circumferential surface 104 of each rim unit 101 is in contact with the contact surface respectively, that is, when the roll is in the initial state, the transition inclined surfaces 107 of each rim unit 101 cooperate with the first boss 305 and the second boss 306 respectively. At this time, a number of rim units 101 enclose to form the rim 1 on the outer circumferential surface 304 of the hub, preventing the rim units 101 from shifting during the operation of the roll.

[0055] Specifically, for the roll used in a pilger rolling mill provided in this application, the conventional design scheme of an integral roll is abandoned. The roll is separately provided with a rim 1, a roll shaft assembly 2, and a hydraulic drive assembly 3. A hydraulic system is formed by the cooperation of the roll shaft assembly 2 and the hydraulic drive assembly 3. The hydraulic system provides telescopic power for each rim unit 101 in the rim 1, enabling workers to accurately replace the worn rim unit 101, avoiding waste of production costs caused by the overall scrapping of the roll. On this basis, through the design of the pass grooves 105 on different rim units 101, the roll can change the model of the product output by the pilger rolling mill by replacing the rim unit 101. The production and preparation of the rim 1 replace the production and preparation of the whole roll, saving production costs.

[0056] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A segmented telescopic roll for a pilger rolling mill, characterized in that, Comprising: A rim, which is integrally circular ring-shaped, and the rim is evenly divided into a plurality of fan-shaped rim units; each rim unit includes a rim outer circumferential surface, a rim side wall, and a rim inner circumferential surface, and a hole-shaped groove is formed on the rim outer circumferential surface of each rim unit, and the hole-shaped grooves on a plurality of rim units are combined to form the rolling structure of the roll in the pilger mill; A roll shaft assembly, including a rotating shaft, the rotating shaft is composed of a transmission part and a working part formed integrally, a key groove is provided on the transmission part for connecting with the main transmission shaft of the pilger mill, a shaft sleeve and a shaft sleeve cover are sleeved on the working part, wherein, the shaft sleeve includes an installation part and a first fastening part, an oil separation plate is provided on the circumferential outer wall of the installation part, the first fastening part is integrally connected with one end of the installation part through a first connecting part, a first oil port is further formed on the first connecting part, the shaft sleeve cover includes a second fastening part and a second connecting part which are integrally arranged, and the shaft sleeve cover is bolted to the other end of the installation part through the second connecting part, a second oil port is further formed on the second connecting part, based on the above structure, when the shaft sleeve and the shaft sleeve cover are mutually matched and installed on the working part of the rotating shaft, the second fastening part and the second connecting part on the shaft sleeve cover and the first fastening part and the first connecting part on the shaft sleeve are symmetric with respect to the oil separation plate in the spatial structure; A hydraulic transmission assembly, which is arranged between the rim and the roll shaft assembly, the hydraulic transmission assembly includes a hub which is integrally circular ring-shaped, annular grooves are respectively formed on two side surfaces of the hub, the two annular grooves are respectively matched with the first fastening part and the second fastening part, at this time, the top of the oil separation plate is attached to the hub inner circumferential surface of the hub, and the oil separation plate divides the gap between the hub and the shaft sleeve and the shaft sleeve cover into a non-communication first cavity and a second cavity, the first oil port is communicated with the first cavity, and the second oil port is communicated with the second cavity; In addition, corresponding to each rim unit on the hub, a corresponding hydraulic unit is provided. Each hydraulic unit includes a hydraulic chamber formed in the hub. The top opening direction of the hydraulic chamber coincides with the radial direction of the hub. A cover plate is fixedly provided at the top opening of the hydraulic chamber. A through hole is provided in the middle of the cover plate. A piston rod is slidably connected inside the through hole. One end of the piston rod extends out of the hydraulic chamber and is connected to the rim unit through a connecting piece. The other end of the piston rod is integrally provided with a piston piece. The piston piece fits against the inner wall of the hydraulic chamber and divides the hydraulic chamber into a first oil chamber and a second oil chamber which are vertically structured and independent of each other along the radial direction of the hub. On this basis, each hydraulic unit further includes a first oil passage and a second oil passage which are independently formed inside the hub. The first oil passage connects the first cavity and the first oil chamber, and the second oil passage connects the second cavity and the second oil chamber. When hydraulic oil is introduced into the first cavity through the first oil port of the roll, and the hydraulic oil enters the first oil chamber of each hydraulic unit through the first oil passage, the piston rod will move in the radial direction of the hub away from the rotating shaft together with the rim unit from the initial state. When hydraulic oil is introduced into the second cavity through the second oil port of the roll, and the hydraulic oil enters the second oil chamber of each hydraulic unit through the second oil passage, the piston rod will move back to the initial state together with the rim unit.

2. The segmented telescopic roll for a pilger mill according to claim 1, wherein: In each of the rim units, a rim connection 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 inclined surface.

3. A segmented telescopic roll for a pilger rolling mill according to claim 2, characterized in that: In the rotating shaft, a connection key is provided on the working part. A positioning shoulder is provided at one end of the connection key. The shaft sleeve and the shaft sleeve cover are positioned and installed on the rotating shaft through cooperation with the connection key and the positioning shoulder. In addition, an end retaining ring is threadedly connected to the end of the working part away from the positioning shoulder for limiting and fixing the shaft sleeve, the shaft sleeve cover and the rotating shaft when the shaft sleeve and the shaft sleeve cover are cooperatively installed on the working part of the rotating shaft.

4. A segmented telescopic roll for a pilger rolling mill according to claim 3, wherein: In the shaft sleeve, a dynamic seal ring is further installed on the side of the oil separation plate that fits against the inner circumferential surface of the hub through a first seal groove. In the shaft sleeve and the shaft sleeve cover, a plurality of second seal grooves are provided on the first fastening part and the second fastening part. A dynamic seal ring is provided in each of the second seal grooves.

5. A segmented telescopic roll for a pilger rolling mill according to claim 4, characterized in that: In the hub, a plurality of third seal grooves are provided inside the annular groove. A dynamic seal ring is also provided in each of the third seal grooves. In addition, in each hydraulic unit on the hub, a dynamic seal ring is further installed on the cover plate at the position where the through hole is preset through a fourth seal groove 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 part is provided on the circumferential outer wall of the piston rod. During the process that the piston rod moves away from the rotating shaft in the hydraulic chamber from the initial state to the position where the limiting part fits against the bottom of the cover plate, the second oil chamber is always connected to the second cavity through the second oil passage. On this basis, a dynamic seal ring is further installed on the piston piece at the position where it fits against the inner wall of the hydraulic chamber through a fifth seal groove.

6. The segmented telescopic roll for a pilger rolling mill according to claim 5, characterized in that: The connecting piece is placed in the 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.

7. The sectional retractable roll for a pilger rolling mill according to claim 6, wherein: The hydraulic transmission assembly further includes a plurality of first bosses evenly arranged on the outer circumferential surface of the hub, and each of the first bosses has the same axial direction as the hub. On this basis, the plurality of first bosses evenly divide the outer circumferential surface of the hub into a plurality of contact surfaces with the same number as the rim units and the same area as the inner circumferential surface of the rim; In addition, second bosses are provided on both sides of the outer circumferential surface of the hub, and when the inner circumferential surfaces of the rims of each rim unit are respectively in contact with the contact surfaces, the transition inclined surfaces of each rim unit are respectively matched with the first bosses and the second bosses. At this time, a plurality of rim units enclose to form a rim on the outer circumferential surface of the hub.

8. A segmented telescopic roll for a pilger rolling mill according to claim 7, characterized in that: The material of each rim unit is H23.

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