Rolled pipe heating device of three-roller planetary rolling mill

Abstract

The utility model discloses a rolled pipe heating device of a three-roller planetary rolling mill, and relates to the technical field related to pipe hot rolling. The conveying device comprises a conveying cylinder, an outer fixing sleeve, nuts and a supporting assembly, outer threaded cylinders are fixed to the two ends of the conveying cylinder, the nuts are in threaded connection with the peripheral sides of the outer threaded cylinders, heat insulation sleeves are fixed to the closed end portions of the nuts in a penetrating mode, the outer fixing sleeve is fixed to the middle of the peripheral side of the conveying cylinder, and the supporting assembly is further fixedly connected to the peripheral side of the conveying cylinder. Through the arrangement of the conveying cylinder, the outer fixing sleeve, the nut and the supporting assembly, the problems that after a rolled pipe heating device of the three-roller planetary rolling mill heats a pipe, heat of the pipe is dissipated quickly, and the conveying stability is affected due to the fact that the pipe is not supported on the heating device are solved; the rolling pipe heating device has the advantages that after the rolling pipe heating device of the three-roller planetary rolling mill heats a pipe, heat of the pipe is dissipated more slowly, the pipe can be stably conveyed and heated on the heating device, and stable conveying is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the technical field of hot rolling of pipes, and in particular relates to a pipe heating device for a three-roll planetary rolling mill. Background Technology

[0002] The three-roll planetary rolling mill mainly consists of a stand, a large disc, three conical rolls, and corresponding rotating mechanisms. The large disc is mounted on the stand, and the three conical rolls are arranged around the center of the large disc. Each roll has its own independent rotating mechanism, and the three conical rolls are at a 120-degree angle to each other. Their axes form an angle with the rolling line, and their centerlines form an angle with the 120-degree graduation line. This arrangement allows the rolls to rotate in the same direction and also revolve around the workpiece with the large disc during operation. In hot-rolled tubes, the tubes need to be heated, so a heating device is required to heat the tubes before they enter the planetary rolling mill. However, in actual use, it still has the following drawbacks:

[0003] In the heating process of the three-roll planetary rolling mill, the tube is directly passed through the induction heating coil. After being heated by the induction heating coil, it is sent to the planetary rolling mill for rolling. However, after the tube passes through the induction heater, the heat on it is directly dissipated, and the temperature of the tube drops, which will cause the temperature to be inaccurate during the final rolling.

[0004] Secondly, during the operation of the heating device, the pipe is directly transported through without support on the heating device and directly transported to the rolling mill. This will cause the pipe transport to be unstable and affect the dimensional accuracy of the pipe rolling. Utility Model Content

[0005] The purpose of this utility model is to provide a tube heating device for a three-roll planetary rolling mill. By setting up a conveying cylinder, an outer fixing sleeve, a nut, and a support assembly, it solves the problems that the heat dissipates quickly after the tube is heated by the tube heating device of the three-roll planetary rolling mill, and that the lack of support for the tube on the heating device affects the conveying stability.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] This utility model relates to a tube heating device for a three-roll planetary rolling mill, comprising a conveying cylinder, an outer fixing sleeve, a nut, and a support assembly. Both ends of the conveying cylinder are fixed with external threaded cylinders, and the circumference of the external threaded cylinder is threaded with a nut. The closed end of the nut is fixed with a heat insulation sleeve. The outer fixing sleeve is fixed in the middle of the circumference of the conveying cylinder, and the support assembly is also fixedly connected to the circumference of the conveying cylinder. During operation, the tube to be heated is conveyed through the conveying cylinder, and the induction heating coil is fixed in the outer fixing sleeve. The tube is conveyed through the structure in the nut, and the support assembly supports the conveying cylinder on the worktable.

[0008] Furthermore, a limiting disc is fixed at both ends of the conveying cylinder, and the two nuts abut against each other. During the operation of the conveying cylinder, the limiting disc restricts the position of the nuts.

[0009] Furthermore, an induction heating coil is fixed inside the outer fixing sleeve. The two electrodes of the induction heating coil extend through the outer fixing sleeve, and the ends of the two electrodes away from the outer fixing sleeve are used to fix the controller. When the outer fixing sleeve is working, the induction heating coil heats the pipe passing through the conveying cylinder.

[0010] Furthermore, a handle is fixed in a ring array around the periphery of the nut, and a fixing plate is fixed in a ring array on the inner wall of the heat insulation sleeve. By rotating the handle on the nut, the handle can be screwed into the external threaded cylinder or unscrewed from the external threaded cylinder.

[0011] Furthermore, all the fixed pieces are fixed together on the side that is close to each other, and the central axis of the inner movable sleeve coincides with the central axis of the heat insulation sleeve. The inner movable sleeve supports the pipe that is conveyed through the nut.

[0012] Furthermore, the support assembly includes a support base, fixing rings, and fixing ports. Fixing rings are fixed at the two short sides of the top of the support base, and fixing ports are provided through each fixing ring. The conveying cylinder is fixed through the fixing ports on the two fixing rings, and the two fixing rings are respectively set at both ends of the outer fixing sleeve. When the support assembly is working, the conveying cylinder is supported on the worktable by the support base and the fixing rings.

[0013] This utility model has the following beneficial effects:

[0014] This invention solves the problem of rapid heat dissipation from the tube after heating by the tube heating device in a three-roll planetary rolling mill by setting up a conveyor cylinder and an outer fixing sleeve. When the tube to be heated is conveyed through the conveyor cylinder, the controller controls the induction heating coil to work. The metal tube passing through the conveyor cylinder is induction heated to a suitable temperature. After induction heating, the tube becomes hot and red-hot, and the dissipated heat remains in the conveyor cylinder and will not be directly lost to the environment, thus reducing temperature errors in the hot rolling process.

[0015] This invention solves the problem of pipes lacking support on the heating device, which affects conveying stability, by setting up a conveying cylinder, an outer fixing sleeve, nuts, and a support assembly. The diameter of the pipe to be processed is determined, a suitable nut is selected, and the nut is aligned with the external threaded cylinders at both ends of the conveying cylinder. The handle on the nut is rotated, causing the nut to screw onto the external threaded cylinder until it abuts against the limiting plate. After abutment, the pipe to be processed can be passed through the inner movable sleeve on one nut and into the conveying cylinder, where it is induction heated until it passes through the inner movable sleeve of the other nut and exits into the three-roll planetary mill. During the process of the pipe passing through the inner movable sleeve, the fixing plates on the periphery of the inner movable sleeve support the pipe on the heat insulation sleeve, reducing heat transfer to the nut, thus ensuring good support of the pipe on the heating device and guaranteeing conveying stability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional view of the tube heating device of a three-roll planetary rolling mill after partial cross-section.

[0018] Figure 2 This is a three-dimensional structural diagram of the conveyor cylinder;

[0019] Figure 3 This is a three-dimensional structural view of the external fixing sleeve;

[0020] Figure 4 This is a three-dimensional structural diagram of the nut;

[0021] Figure 5 A three-dimensional structural diagram of the supporting components;

[0022] Figure 6 This is a three-dimensional view of the assembly structure of a tube heating device for a three-roll planetary rolling mill.

[0023] Figure label:

[0024] 1. Conveying cylinder; 101. Limiting plate; 102. External threaded cylinder; 2. External fixing sleeve; 201. Induction heating coil; 202. Controller; 3. Nut; 301. Handle; 302. Heat insulation sleeve; 303. Fixing plate; 304. Inner movable sleeve; 4. Support assembly; 401. Support base; 402. Fixing ring; 403. Fixing port. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. Specific Implementation Example 1

[0026] Please see Figure 1-3 This utility model is a tube heating device for a three-roll planetary rolling mill, including a conveying cylinder 1, an outer fixing sleeve 2, a nut 3, and a support assembly 4. Both ends of the conveying cylinder 1 are fixed with external threaded cylinders 102. When the conveying cylinder 1 is working, it conveys the tube that has been hot-rolled by the rolling mill. The external threaded cylinder 102 is threadedly connected to the nut 3, connecting the nut 3 to the conveying cylinder 1. The nut 3 is threadedly connected to the periphery of the external threaded cylinder 102. The nut 3 connects to the structure supporting the tube in the conveyed tube. The end of the nut 3, which is closed, is fixed with a heat insulation sleeve 302. The heat insulation sleeve 302 isolates the heat on the tube passing through the inner movable sleeve 304, reducing the heat transfer to the nut 3. The outer fixing sleeve 2 is fixed in the middle of the periphery of the conveying cylinder 1. The outer fixing sleeve 2 fixes the induction heating coil 201 in it, so that the tube passing through the conveying cylinder 1 is heated. The support assembly 4 is also fixedly connected to the periphery of the conveying cylinder 1. When the support assembly 4 is working, it supports the conveying cylinder 1 on the worktable.

[0027] Specifically, a limiting plate 101 is fixed at both ends of the conveying cylinder 1. Two nuts 3 abut against the limiting plate 101 respectively. The limiting plate 101 on the conveying cylinder 1 restricts the position of the nut 3 and the threaded connection between the threaded cylinder 102 and the external threaded cylinder 102.

[0028] Furthermore, an induction heating coil 201 is fixed inside the outer fixing sleeve 2. The two electrodes of the induction heating coil 201 extend through the outer fixing sleeve 2, and the ends of the two electrodes away from the outer fixing sleeve 2 are jointly fixed to the controller 202. The outer fixing sleeve 2 fixes the induction heating coil 201 therein, and the controller 202 controls the operation of the induction heating coil 201.

[0029] The operation process of this embodiment is as follows: During operation, the pipe to be rolled passes through the conveying cylinder 1. The controller 202 activates the induction heating coil 201 to heat the pipe to the preset temperature. After induction heating, the pipe becomes hot and red. The heat dissipated remains in the conveying cylinder 1 and will not be directly lost in the environment, thus reducing the temperature error in the hot rolling process. Specific Implementation Example 2

[0030] Please see Figure 1-6Based on the first specific embodiment, the nut 3 has a handle 301 fixed in a ring array around its periphery, and a fixing plate 303 fixed in a ring array on the inner wall of the heat insulation sleeve 302. When the nut 3 is working, rotating the handle 301 will cause the nut 3 to rotate, and the fixing plate 303 on the inner wall of the heat insulation sleeve 302 will fix the inner movable sleeve 304 therein.

[0031] Specifically, all the fixed pieces 303 are fixed together on the side that are close to each other, and the central axis of the inner movable sleeve 304 coincides with the central axis of the heat insulation sleeve 302. The inner movable sleeve 304 contacts and supports the pipes conveyed through the conveying cylinder 1, so that the pipes passing through the conveying cylinder 1 are supported during operation.

[0032] Furthermore, the support assembly 4 includes a support base 401, a fixing ring 402, and a fixing port 403. The two short sides of the top of the support base 401 are fixed with fixing rings 402, and each fixing ring 402 has a through-hole 403. The conveying cylinder 1 is fixed through the fixing ports 403 on the two fixing rings 402, and the two fixing rings 402 are respectively set at both ends of the outer fixing sleeve 2. When the support assembly 4 is working, the support base 401 is supported on the workbench, and the conveying cylinder 1 is fixed through the fixing ports 403 on the fixing rings 402, thus supporting the conveying cylinder 1 on the support base 401.

[0033] The operation process of this embodiment is as follows: During operation, first determine the diameter of the pipe to be processed, select a suitable nut 3, align the nut 3 with the external threaded cylinders 102 at both ends of the conveying cylinder 1, rotate the handle 301 on the nut 3 to drive the nut 3 to be screwed onto the external threaded cylinder 102 until the nut 3 rotates to abut against the limiting plate 101. After abutment, the pipe to be processed can be passed through the inner movable sleeve 304 on one nut 3 and into the conveying cylinder 1, where it is induction heated until it passes through the inner movable sleeve 304 inside the other nut 3 and exits to be conveyed to the three-roll planetary mill. During the process of the pipe passing through the inner movable sleeve 304, the fixing plate 303 on the periphery of the inner movable sleeve 304 supports the pipe on the heat insulation sleeve 302, reducing the heat transfer to the nut 3. When the nut 3 needs to be replaced, simply turn the handle 301 on the periphery of the nut 3 to unscrew the nut 3 from the external threaded cylinder 102 at the end of the conveying cylinder 1. After unscrewing, select a nut 3 with an inner movable sleeve 304 of appropriate inner diameter, align the nut 3 with the external threaded cylinder 102, turn the handle 301 to screw it onto the external threaded cylinder 102, and then press it onto the limiting plate 101 to complete the replacement work.

[0034] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A tube heating device for a three-roll planetary rolling mill, comprising a conveying cylinder (1), an outer fixing sleeve (2), a nut (3), and a support assembly (4), characterized in that: Both ends of the conveying cylinder (1) are fixed with external threaded cylinders (102). The external threaded cylinder (102) is threaded with a nut (3) on its periphery. The end of the nut (3) is closed and fixed with a heat insulation sleeve (302). An external fixing sleeve (2) is fixed in the middle of the periphery of the conveying cylinder (1). A support component (4) is also fixedly connected to the periphery of the conveying cylinder (1).

2. The tube heating device for a three-roll planetary rolling mill according to claim 1, characterized in that: Limiting discs (101) are fixed at both ends of the conveying cylinder (1), and the two nuts (3) abut against each other.

3. The tube heating device for a three-roll planetary rolling mill according to claim 1, characterized in that: An induction heating coil (201) is fixed inside the outer fixing sleeve (2). The two electrodes of the induction heating coil (201) extend through the outer fixing sleeve (2), and the two electrodes are fixed together at the ends away from the outer fixing sleeve (2) to the controller (202).

4. The tube heating device for a three-roll planetary rolling mill according to claim 1, characterized in that: The nut (3) has a handle (301) fixed in a ring array on its periphery, and the heat insulation sleeve (302) has a fixing plate (303) fixed in a ring array on its inner wall.

5. The tube heating device for a three-roll planetary rolling mill according to claim 4, characterized in that: All the fixing pieces (303) are fixed together on the side close to each other with an inner movable sleeve (304), and the central axis of the inner movable sleeve (304) coincides with the central axis of the heat insulation sleeve (302).

6. The tube heating device for a three-roll planetary rolling mill according to claim 1, characterized in that: The support assembly (4) includes a support base (401), a fixing ring (402) and a fixing port (403). The two short sides of the top of the support base (401) are fixed with fixing rings (402). Each fixing ring (402) has a through fixing port (403). The conveying cylinder (1) is fixed through the fixing ports (403) on the two fixing rings (402). The two fixing rings (402) are respectively set at both ends of the outer fixing sleeve (2).

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