Multi-roller planetary rolling mill device for reducing processing of pipes

Abstract

The invention relates to the technical field of pipe processing, in particular to a multi-roller planetary rolling mill device for pipe hole shrinkage processing, which comprises a rotating drum rotating by taking the axis of the rotating drum as a rotating shaft, and a plurality of rolling units arranged in the rotating drum and circumferentially distributed around the axis of the rotating drum, the multiple rolling units are matched to roll the pipe between the rolling units. By means of the planetary rolling mill, the defect that in a traditional planetary rolling mill, pipe conveying needs to be dragged actively is effectively overcome, by means of the characteristic that the rollers are obliquely arranged, a direct and effective rolling mode can be provided for pipes, power can be provided for conveying of the pipes, and therefore a traction structure does not need to be arranged for the pipes, and the structural mode is simplified; by means of the mode that the rollers are used for rolling and reducing the pipes, rolling machining of the rollers on the pipes can be more effective, the relative friction force is reduced, and the pipe conveying stability is improved.

Description

Technical Field

[0001] This invention relates to the field of pipe processing technology, and in particular to a multi-roll planetary rolling mill apparatus for pipe diameter reduction processing. Background Technology

[0002] Tube reduction is one of the key processes in the field of metal plastic forming. Its main purpose is to reduce the diameter of a specific section of the tube to meet the needs of variable cross-section pipes in fluid transportation, structural connection or lightweight design. This process is widely used in industries such as petrochemical, power grid, automobile manufacturing and aerospace. Traditional reduction mainly relies on methods such as drawing, spinning or radial extrusion. Among them, multi-roll planetary rolling mills are valued for their continuous and efficient deformation capabilities.

[0003] In conventional multi-roll planetary rolling mills, the diameter reduction function is mainly achieved through conical working areas at the ends of the rolls. Multiple rolls are arranged planetarily along the circumference of the tube, and their conical regions together form a gradually shrinking deformation zone. When the rolls revolve around the tube and rotate on their own axes, the conical surfaces contact the outer surface of the tube, causing circumferential compression and axial elongation of the tube through radial extrusion, thereby achieving diameter reduction. However, in this traditional structure, the rolls only provide radial extrusion force, and the axial feed of the tube relies entirely on an independent drawing mechanism, resulting in a complex equipment system and increased energy consumption. Furthermore, the coupling of drawing force and rolling force can easily cause tube instability or uneven wall thickness. At the same time, since the movement trajectory of each point in the conical region is along the circumference of the tube, while the tube is transported along its own axis, there is a significant difference in linear velocity between the roll and the tube. This not only exacerbates sliding friction and generates a large amount of frictional heat, leading to increased workpiece temperature and decreased surface quality, but also requires a cooling system to control the thermal impact, increasing process costs. This structure has weak control over the axial movement of the tube and is prone to process instability phenomena such as vibration and material accumulation during high-speed or large deformation processing. Summary of the Invention

[0004] This invention provides a multi-roll planetary rolling mill device for tube diameter reduction processing, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A multi-roll planetary rolling mill device for tube diameter reduction processing includes a rotating drum that rotates around its own axis and a plurality of rolling units arranged in the drum and distributed circumferentially around the axis of the drum. The plurality of rolling units cooperate to roll the tube between them. The rolling unit includes a support column disposed inside the rotating drum, a mounting frame mounted on the support column, and a roller rotatably disposed on the mounting frame. The axis of the roller is inclined relative to the axis of the rotating drum. The outer circumference of the roller is concave with a middle diameter smaller than the diameters at both ends, and the cross-sectional shape of the concave shape is arc-shaped. On a plane perpendicular to the axis of the rotating drum, the projected shape of the roller is an arc shape consistent with the outer wall shape of the tube. The rolls are inclined in the same direction or in opposite directions.

[0006] Furthermore, the support column is movable along the radial direction of the rotating cylinder via a guide column, and the mounting bracket is rotatably mounted to the support column.

[0007] Furthermore, the roll is composed of two cones facing each other in opposite directions, and the two cones are rotatably mounted on the roll via a drive shaft, and the cones are slidably mounted on the drive shaft.

[0008] Furthermore, the cone consists of a conical working area and an annular area. A connecting ring that is rotatably connected to the other ring is provided on the annular area. A movable seat connected to the connecting ring is slidably provided on the mounting frame. The movable seat and the support column are rotatably connected by a connecting rod.

[0009] Furthermore, the rolling unit also includes a movable disc sleeved on the support column and slidably disposed therebetween, a plurality of gears distributed in the circumferential direction of the movable disc, and a plurality of side plates distributed in a ring on the mounting frame. The gears are rotatably disposed on the movable disc, the projection of the side plates on the surface of the movable disc is arc-shaped, the sidewalls of the side plates are set as inclined surfaces, and teeth that cooperate with the gears are provided on the inclined surfaces.

[0010] Furthermore, a guide groove is provided on the outer wall of the side plate corresponding to the inclined surface, and a sliding column is slidably arranged in the guide groove. The sliding column is connected to the gear through a connecting rod, and the gear is connected to the movable disc through a torsion spring.

[0011] Furthermore, the rolling unit also includes a retaining ring rotatably mounted on the movable disc, several retaining grooves formed on the retaining ring, and a storage chamber disposed opposite to the retaining ring. Fluid is stored in the retaining ring. A sliding arm is slidably mounted on the side plate along the moving direction of the support column. The sliding arm is fixed relative to the retaining ring. Several retaining posts that cooperate with each of the retaining grooves are slidably mounted on the storage chamber. The distance between two adjacent retaining grooves or the distance between two adjacent retaining posts gradually changes along the circumferential direction of the retaining ring.

[0012] Furthermore, a plurality of connecting columns are slidably arranged on the storage chamber, the connecting columns are fixed relative to the movable disk, and the storage chamber and the movable disk are connected by an elastic body. The storage chamber is equipped with several propulsion cylinders that provide power for the movement of the storage chamber.

[0013] Furthermore, the rolling mill device also includes a side ring platform, the rotating drum is coaxially arranged with the side ring platform and rotates relative to it, and a plurality of transmission wheels are rolled on the side wall of the side ring platform; A transmission ring coaxial with the support column is rotatably mounted on the mounting frame. Transmission wheel two and transmission wheel three are driven on the transmission ring. Transmission wheel two is connected to transmission wheel one through a telescopic rod. The fixed end and movable end of the telescopic rod are fixed relative to the support column and guide column, respectively. Transmission wheel three is drivenly connected to the roller.

[0014] Furthermore, both the outer wall of the side ring platform and the outer wall of the rotating cylinder are provided with arc-shaped outer edges. The two arc-shaped outer edges are arc-shaped with the same circle on the cross-section where the axis of the rotating cylinder is located. A power wheel is provided between the two arc-shaped outer edges, and the tilt angle of the power wheel between the two arc-shaped outer edges can be adjusted.

[0015] The technical solution of this invention can achieve the following technical effects: This invention effectively solves the drawback of traditional planetary rolling mills that require active traction for pipe transport. By utilizing the characteristic of several rollers tilted in this invention, it not only provides a direct and effective rolling mode for the pipe but also provides power for pipe transport. This eliminates the need for a traction structure for the pipe, simplifying the structure. The method of rolling and compressing the pipe diameter using rollers makes the rolling process more efficient, reduces relative friction, improves pipe transport stability, reduces wear and frictional heat, improves pipe processing quality, and avoids process instability phenomena such as vibration and material accumulation during high-speed or large-deformation pipe processing.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a multi-roll planetary rolling mill device for tube diameter reduction processing; Figure 2 This is a cross-sectional view of the rotating drum. Figure 3 for Figure 1 A schematic diagram of the internal structure of the transfer cylinder; Figure 4 for Figure 3 Schematic diagram of the intermediate rolling unit; Figure 5 for Figure 4 Schematic diagram of the intermediate roll and its structure; Figure 6 for Figure 4 Schematic diagram of the middle side plate and its superstructure; Figure 7 for Figure 6 A schematic diagram of the central movable plate and its upper structure; Figure 8 for Figure 6 A cross-sectional view of the central storage compartment; Attached reference numerals: 100, rotating drum; 200. Rolling unit; 201. Support column; 202. Mounting bracket; 203. Roll; 204. Guide column; 205. Cone; 206. Drive shaft; 207. Connecting ring; 208. Moving seat; 209. Connecting rod one; 210. Movable plate; 211. Gear; 212. Side plate; 213. Inclined surface; 214. Guide groove; 215. Sliding column; 216. Connecting rod two; 217. Torsion spring; 300. Snap ring; 301. Snap groove; 302. Sliding arm; 303. Storage chamber; 304. Snap pin; 305. Connecting pin; 306. Elastomer one; 307. Propulsion cylinder; 308. Fixing cover; 309. Sub-pipe; 310. Piston; 311. Elastomer two; 400. Side ring platform; 401. Transmission wheel one; 402. Transmission ring; 403. Transmission wheel two; 404. Transmission wheel three; 405. Telescopic rod; 406. Arc-shaped outer edge; 407. Power wheel; 408. Drive motor; 409. Fixing frame; 410. Adjustment seat. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] like Figures 1 to 5 As shown, this application provides a multi-roll planetary rolling mill device for tube diameter reduction processing, including a rotating drum 100 that rotates around its own axis and a plurality of rolling units 200 disposed inside the rotating drum 100 and distributed circumferentially around the axis of the rotating drum 100, wherein the plurality of rolling units 200 cooperate to roll the tube between them. The rolling unit 200 includes a support column 201 disposed inside the rotating drum 100, a mounting frame 202 mounted on the support column 201, and a roller 203 rotatably disposed on the mounting frame 202. The axis of the roller 203 is inclined relative to the axis of the rotating drum 100. The outer circumference of the roller 203 is concave with a middle diameter smaller than the diameters at both ends, and the cross-sectional shape of the concave shape is arc-shaped. On a plane perpendicular to the axis of the rotating drum 100, the projected shape of the roller 203 is an arc shape consistent with the outer wall shape of the tube. Several rolls 203 are tilted in the same direction or in opposite directions.

[0022] Specifically, the pipe passes through the rotating drum 100 and is conveyed. The axis of the rotating drum 100 can be set horizontally, vertically, or inclined, depending on the direction of pipe conveying or production requirements. The rotating drum 100 can be mounted on an external support, and an independent motor drive can be installed to enable the rotating drum 100 to rotate. Several rolling units 200 are installed inside the rotating drum 100 and distributed around the axis of the rotating drum 100. In this way, the rolling units 200 can contact different positions on the pipe passing through the rotating drum 100. With the rotation of the rotating drum 100, the rolling units 200 can move around the circumference of the pipe and squeeze the pipe, thereby achieving the pipe diameter reduction process. Of course, since the contact trajectory between the rolling units 200 and the pipe only occupies a part of the outer wall of the pipe, multiple sets of rolling units 200 can be set along the axis of the rotating drum 100, and each set can contain multiple rolling units 200. This allows the rolling area to fully cover the outer wall of the pipe.

[0023] The support column 201 can support the mounting frame 202 and the roll 203. The support column 201 is set along the radial direction of the rotating drum 100. The center point of the roll 203 is located on the plane where the support column 201 and the axis of the rotating drum 100 are located. Therefore, when the roll 203 is set at an angle, the axis of the roll 203 and the axis of the rotating drum 100 can still be aligned, and there will be no misalignment or deviation between the axis of the roll 203 and the axis of the rotating drum 100. The special design of the outer wall shape of the roll 203 allows it to occupy a large area in the circumferential direction of the tube and also a large area in the axial direction of the tube when it comes into contact with the tube. When the roll 203 rotates, it can provide both rolling force and lateral conveying force to the tube.

[0024] The arrangement of several rolls 203 around the circumference of the tube can be as follows: Figure 3 As shown, the inclination directions of the rolls 203 are the same. Of course, some rolls 203 can be inclined toward one side of the drum 100, and other rolls 203 can be inclined toward the other side of the drum 100, or the inclination directions of adjacent rolls 203 can be arranged opposite each other. As long as the oblique rolling effect of the rolls 203 on the tube can be achieved, and the force exerted by the rolls 203 on the tube is balanced, it is within the scope of protection of this case. In some embodiments, in order to consider that the oblique rolling effect of the rolls 203 on the tube will cause the tube to be subjected to a torsional force, the rolls 203 can be arranged in the same direction. Of course, different arrangement methods can be adopted based on other processing requirements.

[0025] In use, the tube passes through the gap between the rotating drum 100 and several rolling units 200, driving the rotating drum 100 and the rollers 203 on each rolling unit 200 to rotate. The rotating drum 100 drives the several rolling units 200 to move in a circular motion around the tube. At the same time, the rollers 203 in each rolling unit 200 roll on the surface of the tube. Due to the inclined arrangement of the rollers 203, the force exerted by the rollers 203 in the circumferential direction of the tube will reduce the diameter of the tube, thereby realizing direct rolling and diameter reduction processing of the tube. Meanwhile, along the axial direction of the tube, the rollers 203... The rotation utilizes friction to drive the tube forward, thus achieving the automatic conveying function of the tube; while in the traditional planetary rolling mill, the rotation axis of the roll 203 is coplanar with the tube axis. Along the tube conveying direction, the traditional rolling mill does not use the rolling rolling method, but the drawing rolling method. The rotation of the roll 203 is only for the extrusion of the tube deformation zone; in addition, this inclined setting of the roll 203 can also increase the length of the contact line between it and the tube, thereby increasing the force-bearing area and the deformation processing area, and reducing the number of rolling units 200.

[0026] It should be noted that when the rolling unit 200 performs diameter reduction processing on the pipe, it can also be configured with conventional structures such as mandrels and lubrication structures in the traditional structural method. The mandrel is mainly used to limit the inner diameter of the pipe.

[0027] The technical solution of this invention effectively solves the drawback of traditional planetary rolling mills that require active traction for tube transport. By utilizing the characteristic of the inclined arrangement of several rolls 203 in this invention, not only can a direct and effective rolling mode be provided for the tube, but also power can be provided for the transport of the tube. Thus, there is no need to configure a traction structure for the tube, simplifying the structure. The method of rolling and compressing the tube using the rolls 203 can make the rolling process of the tube by the rolls 203 more effective, reduce relative friction, improve the stability of tube transport, reduce wear and frictional heat, improve the tube processing quality, and avoid process instability phenomena such as vibration and material accumulation during high-speed or large deformation tube processing.

[0028] Furthermore, such as Figure 5 As shown, the support column 201 is movable along the radial direction of the rotating cylinder 100 via the guide column 204, and the mounting bracket 202 is rotatably mounted on the support column 201.

[0029] The guide column 204 and the support column 201 are coaxially arranged and both are along the radial direction of the rotating drum 100. The guide column 204 is mainly used to guide the support column 201. At the same time, the guide column 204 can restrict the rotation of the support column 201, so that the support column 201 can only move. The mounting bracket 202 is rotatably arranged on the support column 201, which can adjust the tilt angle of the roller 203, so that the radius of the arc of the projection of the roller 203 on the plane perpendicular to the axis of the rotating drum 100 can be increased or decreased. This realizes the adjustment of the position and radius of the arc. That is, when it is necessary to process pipes of different diameters, it is only necessary to adjust the tilt angle of the roller 203 to change the radius of its projected arc, and then adjust the position of the support column 201 so that the center of the arc coincides with the axis of the rotating drum 100, thus meeting the needs of the roller 203 for processing pipes of different diameters.

[0030] Furthermore, the roll 203 is composed of two cones 205 facing each other in two directions, and the two cones 205 are rotatably mounted on the roll 203 via a drive shaft 206, while the cones 205 are slidably mounted on the drive shaft 206.

[0031] like Figure 5As shown, when the pipe diameter is large, if the roller 203 adopts an integral structure, its action position on the pipe is relatively concentrated. In this case, the roller 203 can be combined with two cones 205, and the distance between the two cones 205 can be adjusted to increase the span between the two cones 205, which facilitates the dispersion of the action position. In addition, the combination of two cones 205 and roller 203 can also be matched with the tilt angle adjustment function of the roller 203. When processing pipes of different diameters, the projected radius can be adjusted by adjusting the tilt angle of the roller 203 and the distance between the two cones 205. The extrusion of the pipe by the two cones 205 makes the roundness of the outer wall of the pipe higher, thereby improving the processing quality of the pipe.

[0032] To enable the two cones 205 to rotate synchronously, a guide ridge can be provided on the outer wall of the drive shaft 206, or the cross-sectional shape of the drive shaft 206 can be set to a polygon or an irregular shape.

[0033] Furthermore, the cone 205 consists of a cone-shaped working area and an annular area. A connecting ring 207 is provided on the annular area and rotates with each other. A movable seat 208 connected to the connecting ring 207 is slidably provided on the mounting frame 202. The movable seat 208 and the support column 201 are rotatably connected by a connecting rod 209.

[0034] like Figure 5 As shown, the conical working area of ​​cone 205 is mainly used for extruding the pipe, while the annular area is mainly used for adjusting the position of cone 205 on drive shaft 206. When mounting bracket 202 rotates on support column 201, support column 201 can be pulled or pushed by connecting rod 209 to move moving seat 208. Moving seat 208 adjusts the position of cone 205 on drive shaft 206 through connecting ring 207, thereby adjusting the distance between the two cones 205.

[0035] by Figure 5 For example, when the mounting frame 202 rotates, the connecting rod 209 moves along the radial direction of the support column 201, pulling the moving seat 208 to move, causing the two cones 205 to move closer to each other. If the connecting rod 209 is tilted relative to the support column 201 in its natural state, then when the mounting frame 202 rotates and the connecting rod 209 moves to a position along the radial direction of the support column 201, the two cones 205 will separate from each other. The specific setting method can be determined according to actual needs.

[0036] Since the distance between the two cones 205 can be adjusted by rotating the mounting frame 202, the tilt angle adjustment function of the roll 203 and the distance adjustment function between the two cones 205 can be linked together. By simply adjusting the tilt angle of the mounting frame 202 and the roll 203, the distance adjustment between the two cones 205 can be completed simultaneously.

[0037] Furthermore, such as Figures 6 to 7 As shown, the rolling unit 200 also includes a movable disk 210 sleeved on the support column 201 and slidably disposed therebetween, a plurality of gears 211 distributed in the circumferential direction of the movable disk 210, and a plurality of side plates 212 distributed in a ring on the mounting frame 202. The gears 211 are rotatably disposed on the movable disk 210, the projection of the side plates 212 on the surface of the movable disk 210 is arc-shaped, the side wall of the side plate 212 is set as an inclined surface 213, and teeth that cooperate with the gears 211 are provided on the inclined surface 213.

[0038] Since the movable plate 210 and the mounting frame 202 are connected by the side plate 212 and the gear 211, when the distance between the movable plate 210 and the mounting frame 202 changes, the side plate 212 and the gear 211 move relative to each other along the circumference of the movable plate 210. That is, the movable plate 210 and the mounting frame 202 rotate synchronously relative to each other, and the gear 211 rolls on the inclined surface 213.

[0039] In use, several mounting frames 202 are in a separated state. At this time, the tube can be passed through the gap between several rolling units 200. When rolling the tube, the movable disc 210 and the mounting frame 202 are pushed to move towards the tube. The support column 201 slides on the guide column 204. When the roll 203 contacts the tube, the mounting frame 202 stops moving. At this time, the movable disc 210 continues to move. The movable disc 210 pushes the side plate 212 to move around the circumference of the movable disc 210 through the gear 211. This causes the mounting frame 202 and the roll 203 to rotate around the axis of the support column 201. This changes the state from only the middle area of ​​the roll 203 contacting the tube to the state where the arc-shaped concave on the roll 203 is in full line contact with the tube. At this time, the larger diameter areas at both ends of the roll 203 will be stuck on the tube, and the roll 203 stops rotating. This achieves the adaptive adjustment of the roll 203 and the tube.

[0040] Using the above mode, there is no need to initially set the angle of the roll 203 separately. The roll 203 can be actively brought close to the tube and automatically rotated to a suitable position for contact with the tube. This effectively simplifies the operation, improves applicability, and enhances the fitting accuracy, thereby improving the processing quality. Since the roll 203 is composed of two cones 205, the two cones 205 can be in a mating state initially. When the roll 203 rotates and tilts relative to the tube, the two cones 205 separate from each other.

[0041] Based on the above implementation, the initial state of the roll 203 can be set such that the axis of the roll 203 is perpendicular to the axis of the drum 100. When the roll 203 contacts the tube, the roll 203 rotates and tilts relative to the axis of the drum 100.

[0042] Furthermore, a guide groove 214 is provided on the outer wall of the side plate 212 corresponding to the inclined surface 213. A sliding column 215 is slidably arranged in the guide groove 214. The sliding column 215 is connected to the gear 211 through a connecting rod 216. The gear 211 is connected to the movable disc 210 through a torsion spring 217.

[0043] like Figure 7 As shown, the torsion spring 217 can provide a restoring force for the gear 211. Initially, the movement of the movable disk 210 will push the mounting frame 202 to move synchronously through the gear 211, the side plate 212 and the torsion spring 217. When the mounting frame 202 stops moving, the continued movement of the movable disk 210 will overcome the torsion spring 217 and make the gear 211 roll on the inclined plane 213. Thus, by simply moving the movable disk 210, multiple functions such as driving the roller 203 to move, driving the roller 203 to rotate, and driving the two cones 205 to move relative to each other can be completed, making its operation more convenient.

[0044] The shape of the guide groove 214 is consistent with the shape of the inclined plane 213. When the gear 211 rolls on the inclined plane 213, the gear 211 will drive the sliding column 215 to slide in the guide groove 214 through the connecting rod 216. The guide groove 214 and the sliding column 215 guide and restrict the gear 211, so that the side plate 212 and the gear 211 can always be used in conjunction.

[0045] Furthermore, such as Figures 7 to 8 As shown, the rolling unit 200 also includes a retaining ring 300 rotatably mounted on the movable disk 210, a plurality of retaining grooves 301 formed on the retaining ring 300, and a storage chamber 303 disposed opposite to the retaining ring 300. Along the circumferential direction of the movable disk 210, the storage chamber 303 is relatively stationary with respect to the movable disk 210. Fluid is stored in the retaining ring 300. A sliding arm 302 is slidably mounted on the side plate 212 along the moving direction of the support column 201. The sliding arm 302 is relatively fixed to the retaining ring 300. A plurality of retaining posts 304 that cooperate with each retaining groove 301 are slidably mounted on the storage chamber 303. Along the circumferential direction of the retaining ring 300, the distance between two adjacent retaining grooves 301 or the distance between two adjacent retaining posts 304 gradually changes.

[0046] When the movable disk 210 rotates relative to the mounting frame 202, the side plate 212 drives the retaining ring 300 to rotate on the movable disk 210 through the sliding arm 302. The several retaining grooves 301 on the retaining ring 300 and the several retaining posts 304 on the storage chamber 303 will move relative to each other. After the position of the roll 203 is adjusted, the retaining ring 300 and the movable disk 210 are relatively stationary. At this time, the storage chamber 303 can be driven to move toward the retaining ring 300. Some of the retaining posts 304 on the storage chamber 303 will be inserted into the corresponding several retaining grooves 301, thereby locking the movable disk 210 and the retaining ring 300 together and realizing the function of locking the position of the roll 203.

[0047] By gradually varying the distance between two adjacent slots 301 or the distance between two adjacent pins 304, some slots 301 and some pins 304 will always be engaged in locking after the roll 203 has completed its angle adjustment. This greatly improves the randomness of the roll 203's position locking and avoids the drawback that when several slots 301 and pins 304 are equidistantly distributed, the slots 301 and pins 304 can only be used when the movable disc 210 and the retaining ring 300 rotate relative to each other by a specified angle. In other words, the roll 203 can only achieve position locking at a specific tilt position.

[0048] When some of the locking posts 304 cannot be matched with the corresponding locking slots 301, the oil stored in the storage chamber 303 can be squeezed by the top surface of the locking ring 300 and retracted into the storage chamber 303. At this time, the locking posts 304 will squeeze the liquid in the storage chamber 303, so that the liquid squeezes the locking posts 304 that can be matched, thereby improving the matching and locking effect between the locking ring 300 and the storage chamber 303.

[0049] Furthermore, such as Figure 4 , Figure 6 and Figure 8 As shown, a plurality of connecting posts 305 are slidably arranged on the storage chamber 303. The connecting posts 305 are fixed relative to the movable disk 210. The storage chamber 303 and the movable disk 210 are connected by an elastic body 306. The storage chamber 303 is equipped with several propulsion cylinders 307 that provide power for the movement of the storage chamber 303.

[0050] The connecting post 305 guides the movable disk 210 and the storage chamber 303, preventing them from rotating relative to each other. The elastic body 306 provides elastic force to the storage chamber 303. When the push cylinder 307 pushes the storage chamber 303 to move, it drives the movable disk 210 to move through the elastic body 306. When the gear 211 rolls to the specified position on the inclined plane 213, the movable disk 210 stops moving, and the movable disk 210 and the retaining ring 300 stop rotating relative to each other. At this time, the push cylinder 307 continues to push the storage chamber 303 to overcome the elastic force of the elastic body 306 and move. The retaining post 304 on the storage chamber 303 engages with the corresponding retaining groove 301, thereby realizing the locking function.

[0051] In some embodiments, the rolling unit 200 may further include a fixed cover 308, which is fixed to the inner wall of the rotating drum 100. The push cylinder 307 and the guide column 204 are both disposed on the fixed cover 308, thereby providing overall support for the rolling unit 200 through the fixed cover 308. To buffer the movement of the liquid in the storage chamber 303 and the several clamping columns 304, a secondary pipe 309 is connected to the storage chamber 303. A piston 310 and an elastic body 311 are disposed in the secondary pipe 309. The elastic body 311 provides elastic force to the piston 310. When the liquid in the storage chamber 303 is moved, the pressure of the liquid is reduced. Force can be transmitted to piston 310 and push piston 310 to move, and elastic body 311 undergoes elastic deformation; in the natural state, in order to fix the position of several locking pins 304 on storage chamber 303, each locking pin 304 is provided with a limiting outer edge at its end. The elastic force provided by elastic body 311 to piston 310 will cause piston 310 to squeeze the liquid in secondary tube 309 into storage chamber 303. At this time, the liquid in storage chamber 303 will push locking pins 304 to move outward until the outer edge on locking pin 304 contacts the inner wall of storage chamber 303, thereby limiting the initial position of several locking pins 304.

[0052] Furthermore, such as Figure 2 and Figure 4 As shown, the rolling mill device also includes a side ring platform 400, the rotating drum 100 is coaxially arranged with the side ring platform 400 and rotates relative to it, and a number of transmission wheels 401 are rolled on the side wall of the side ring platform 400. A transmission ring 402, coaxial with the support column 201, is rotatably mounted on the mounting frame 202. A second transmission wheel 403 and a third transmission wheel 404 are driven on the transmission ring 402. The second transmission wheel 403 is connected to the first transmission wheel 401 by a telescopic rod 405. The fixed end and the movable end of the telescopic rod 405 are fixed relative to the support column 201 and the guide column 204, respectively. The third transmission wheel 404 is driven by the roller 203.

[0053] When the rotating drum 100 moves relative to the side ring platform 400, the first transmission wheel 401 rolls on the side wall of the side ring platform 400. At this time, the first transmission wheel 401 drives the roll 203 to rotate through the telescopic rod 405, the second transmission wheel 403, the transmission ring 402, and the third transmission wheel 404, thereby linking the revolution and rotation of the roll 203 together, and eliminating the need for a separate power source for the roll 203. Since the roll 203 can move at an angle, in order to ensure that the power source for the roll 203 is always provided, a structure of transmission ring 402, second transmission wheel 403, and third transmission wheel 404 can be adopted, that is, the transmission ring 402 always connects the second transmission wheel 403 and the third transmission wheel 404 together. The relative movement between the side ring platform 400 and the rotating drum 100 can provide a higher speed for the rotation of the roll 203. In some embodiments, a separate drive motor structure can be provided for both the side ring platform 400 and the rotating drum 100.

[0054] Furthermore, such as Figure 2 As shown, arc-shaped outer edges 406 are provided on the outer wall of the side ring platform 400 and the outer wall of the rotating cylinder 100. The two arc-shaped outer edges 406 are arc-shaped with the same circle on the cross section where the axis of the rotating cylinder 100 is located. A power wheel 407 is driven between the two arc-shaped outer edges 406. The tilt angle of the power wheel 407 between the two arc-shaped outer edges 406 can be adjusted.

[0055] When the drive wheel 407 rotates, it drives the two arc-shaped outer edges 406 to move synchronously relative to each other. The two arc-shaped outer edges 406 drive the side ring platform 400 and the rotating drum 100 to move synchronously relative to each other. When the tilt angle of the drive wheel 407 changes, the transmission ratio between the drive wheel 407 and the two arc-shaped outer edges 406 changes. At this time, the drive wheel 407 and the two arc-shaped outer edges 406 still maintain the transmission state, thereby adjusting the relative speed ratio between the side ring platform 400 and the rotating drum 100.

[0056] The center point of the drive wheel 407 can coincide with or be offset from the center of the arc of the cross section of the arc-shaped outer edge 406, as long as the drive wheel 407 and the two arc-shaped outer edges 406 can be mutually transmitted.

[0057] like Figure 2 As shown, in order to support the power wheel 407, the rolling mill device also includes a fixed frame 409 and an adjusting seat 410 that is slidably arranged on the fixed frame 409 in an arc shape. The adjusting seat 410 is equipped with a drive motor 408, which is connected to the power wheel 407 in a transmission. Thus, by simply adjusting the position of the adjusting seat 410 on the fixed frame 409, the transmission ratio between the power wheel 407 and the two arc-shaped outer edges 406 can be adjusted.

[0058] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of the application as defined herein, and are to be considered as covering any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Thus, if such modifications and modifications fall within the scope of this application and its equivalents, this application intends to include such modifications and modifications.

Claims

1. A multi-roll planetary rolling mill apparatus for tube diameter reduction processing, characterized in that, It includes a rotating drum that rotates around its own axis and a plurality of rolling units arranged in a circle around the axis of the drum. The plurality of rolling units cooperate to roll the tube between them. The rolling unit includes a support column disposed inside the rotating drum, a mounting frame mounted on the support column, and a roller rotatably disposed on the mounting frame. The axis of the roller is inclined relative to the axis of the rotating drum. The outer circumference of the roller is concave with a middle diameter smaller than the diameters at both ends, and the cross-sectional shape of the concave shape is arc-shaped. On a plane perpendicular to the axis of the rotating drum, the projected shape of the roller is an arc shape consistent with the outer wall shape of the tube. The rolls are inclined in the same direction or in opposite directions.

2. The multi-roll planetary rolling mill apparatus for tube diameter reduction processing according to claim 1, characterized in that, The support column is movable along the radial direction of the rotating cylinder via a guide column, and the mounting bracket is rotatably mounted to the support column.

3. The multi-roll planetary rolling mill apparatus for tube diameter reduction processing according to claim 1, characterized in that, The roll is composed of two cones facing each other, and the two cones are rotatably mounted on the roll via a drive shaft, and the cones are slidably mounted on the drive shaft.

4. A multi-roll planetary rolling mill apparatus for tube diameter reduction processing according to claim 3, characterized in that, The cone consists of a conical working area and an annular area. A connecting ring that is rotatably connected to the other ring is provided on the annular area. A movable seat that is connected to the connecting ring is slidably provided on the mounting frame. The movable seat is rotatably connected to the support column through a connecting rod.

5. A multi-roll planetary rolling mill apparatus for tube diameter reduction processing according to claim 1, characterized in that, The rolling unit also includes a movable disc sleeved on the support column and slidably disposed therebetween, a plurality of gears distributed in the circumferential direction of the movable disc, and a plurality of side plates distributed in a ring on the mounting frame. The gears are rotatably disposed on the movable disc, the projection of the side plates on the surface of the movable disc is arc-shaped, the sidewalls of the side plates are set as inclined surfaces, and teeth that cooperate with the gears are provided on the inclined surfaces.

6. A multi-roll planetary rolling mill apparatus for tube diameter reduction processing according to claim 5, characterized in that, A guide groove is provided on the outer wall of the side plate corresponding to the inclined surface. A sliding column is slidably arranged in the guide groove. The sliding column is connected to the gear through a connecting rod. The gear is connected to the movable disc through a torsion spring.

7. A multi-roll planetary rolling mill apparatus for tube diameter reduction processing according to claim 5, characterized in that, The rolling unit further includes a retaining ring rotatably mounted on the movable disc, several retaining grooves formed on the retaining ring, and a storage chamber disposed opposite to the retaining ring. Fluid is stored in the retaining ring. A sliding arm is slidably mounted on the side plate along the moving direction of the support column. The sliding arm is fixed relative to the retaining ring. Several retaining posts that cooperate with each of the retaining grooves are slidably mounted on the storage chamber. The distance between two adjacent retaining grooves or the distance between two adjacent retaining posts gradually changes along the circumferential direction of the retaining ring.

8. A multi-roll planetary rolling mill apparatus for tube diameter reduction processing according to claim 7, characterized in that, A plurality of connecting columns are slidably disposed on the storage chamber, the connecting columns are fixed relative to the movable disk, and the storage chamber and the movable disk are connected by an elastic body. The storage chamber is equipped with several propulsion cylinders that provide power for the movement of the storage chamber.

9. A multi-roll planetary rolling mill apparatus for tube diameter reduction processing according to claim 2, characterized in that, The rolling mill device also includes a side ring platform, the rotating drum is coaxially arranged with the side ring platform and rotates relative to it, and a plurality of transmission wheels are rolled on the side wall of the side ring platform; A transmission ring coaxial with the support column is rotatably mounted on the mounting frame. Transmission wheel two and transmission wheel three are driven on the transmission ring. Transmission wheel two is connected to transmission wheel one through a telescopic rod. The fixed end and movable end of the telescopic rod are fixed relative to the support column and guide column, respectively. Transmission wheel three is drivenly connected to the roller.

10. A multi-roll planetary rolling mill apparatus for tube diameter reduction processing according to claim 9, characterized in that, Both the outer wall of the side ring platform and the outer wall of the rotating drum are provided with arc-shaped outer edges. The two arc-shaped outer edges are arc-shaped with the same circle on the cross section where the axis of the rotating drum is located. A power wheel is provided between the two arc-shaped outer edges for transmission. The tilt angle of the power wheel between the two arc-shaped outer edges can be adjusted.

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