Rolling device of seamless steel pipe diameter-increasing and wall-reducing hot mill

Abstract

The utility model relates to the technical field of steel pipe machining, in particular to a seamless steel pipe diameter-increasing and wall-reducing hot mill calendering device which comprises a base, a heating coil arranged on the base, a driving assembly and an adjusting assembly arranged on the base, the driving assembly comprises a supporting plate, a circular ring fixedly connected to the supporting plate, and three limiting rings fixedly connected to the circular ring. Round rods are slidably connected to the interiors of the three limiting rings correspondingly, rollers are fixedly connected to the three round rods correspondingly, the three round rods penetrate through the three rollers correspondingly, a motor is fixedly connected to the base, prismatic tables are fixedly connected to the three round rods correspondingly, a prism is fixedly connected to an output shaft of the motor, a friction shaft is slidably connected to the prism, and the friction shaft is connected with the three prismatic tables. According to the utility model, the elastic force of the spring can be utilized to control the pin roller to extrude the steel pipe, so as to control the outer diameter of the steel pipe, reduce the extrusion force of the pin roller on the steel pipe and slow down the diameter-increasing and wall-reducing speed of the steel pipe, but the density and internal stress of the finally produced steel pipe can be kept stable.

Description

Technical Field

[0001] This utility model relates to the field of steel pipe processing technology, specifically to a hot rolling mill rolling device for increasing diameter and reducing wall thickness of seamless steel pipes. Background Technology

[0002] Seamless steel pipe diameter increase and wall thickness reduction refers to the process of increasing the diameter of the steel pipe and reducing the wall thickness through specific processes during production.

[0003] In the process of increasing diameter and reducing wall thickness of seamless steel pipes, three rollers are often used to extrude and shape the heated and softened steel pipe to control its outer diameter. At the same time, another roller is inserted into the steel pipe to control its inner diameter. During this process, the movement of the rollers is mechanically controlled, which generates strong extrusion pressure on the steel pipe. If the movement speed of the rollers is not well controlled, the final produced steel pipe will have uneven density and uneven internal stress. Therefore, a new type of rolling device is needed to solve this problem. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model proposes a hot rolling mill rolling device for increasing diameter and reducing wall thickness of seamless steel pipes. It can use the elastic force of springs to control the rollers to squeeze the steel pipe, thereby controlling the outer diameter of the steel pipe, reducing the squeezing force of the rollers on the steel pipe, and slowing down the speed of increasing diameter and reducing wall thickness of the steel pipe. However, it can keep the density and internal stress of the final produced steel pipe stable.

[0005] The technical solution to achieve the purpose of this utility model is as follows: a hot rolling mill rolling device for increasing diameter and reducing wall of seamless steel pipe, including a base, a heating coil on the base, a drive assembly and an adjustment assembly on the base, the drive assembly including a support plate, a ring fixedly connected to the support plate, three limiting rings fixedly connected to the ring, a round rod slidably connected inside each of the three limiting rings, a roller fixedly connected to each of the three round rods, the three round rods respectively passing through the three rollers, a motor fixedly connected to the base, a frustum fixedly connected to each of the three round rods, a prism fixedly connected to the output shaft of the motor, a friction shaft slidably connected to the prism, the friction shaft being connected to the three frustums, and an adjustment assembly on the base.

[0006] Preferably, the adjustment component includes a sliding seat that is slidably connected to the base, and the sliding seat has a groove.

[0007] Preferably, the adjustment assembly further includes fixing rods, and each of the three prisms is fixedly connected to a fixing rod, with the ends of the three fixing rods slidably connected to the inner wall of the groove.

[0008] Preferably, the adjustment assembly further includes a cylinder and a push rod. The cylinder is fixedly connected to the base, and the push rod is fixedly connected to the output shaft of the cylinder. The push rod is rotatably connected to one end of the friction shaft.

[0009] Preferably, the adjusting assembly further comprises a spring fixedly connected between the base and the sliding seat, and the spring is located on the side of the sliding seat away from the fixed rods.

[0010] Preferably, vertical lines exist on the side of the friction shaft and the side of the three prisms.

[0011] Compared with the prior art, the utility model has the following remarkable advantages:

[0012] Firstly, in the utility model, the steel pipe to be processed is placed between the three rollers, at this time, the motor can be started, the rotation of the output shaft of the motor drives the prism to rotate, and then the friction shaft rotates, when the friction shaft rotates, the vertical lines on the friction shaft and the vertical lines on the three prisms generate a large static friction force, therefore, the rotation of the friction shaft drives the three prisms to rotate, the rotation of the three prisms drives the rollers and the round rod to rotate, and the rotation of the three rollers gradually shapes the softened steel pipe, and the diameter is increased and the wall is reduced.

[0013] Secondly, in the utility model, in order to control the outer diameter of the steel pipe, the distance between the three rollers needs to be adjusted, at this time, the cylinder can be started, the push rod is reciprocated by the cylinder, the friction shaft is reciprocated, the sliding seat is moved to the direction of the friction shaft due to the elastic force of the spring, therefore, the three fixed rods are pushed by the sliding seat, the three fixed rods are limited by the inner wall of the groove, at this time, the three fixed rods are close to the middle, and the three rollers are close to the middle, so that the steel pipe between the three rollers is extruded, and the steel pipe is shaped.

[0014] Thirdly, in the utility model, because there is a large tangential friction force between the three prisms and the friction shaft, the position of the friction shaft limits the position of the three prisms, that is, the position of the three rollers, when the three rollers clamp the steel pipe, not only the three rollers rotate to help shape the steel pipe, but also the three rollers slowly close to the middle under the action of the spring and the sliding seat, and the specific size shaping is gradually completed. BRIEF DESCRIPTION OF DRAWINGS

[0015] The utility model will be explained further in combination with the drawings and embodiments:

[0016] Figure 1 It is the three-dimensional structure schematic of the utility model Figure 1 ;

[0017] Figure 2 It is the three-dimensional structure schematic of the utility model Figure 2 ;

[0018] Figure 3 It is the connecting structure schematic drawing of the driving assembly and the adjusting assembly in the utility model

[0019] Figure 4It is the A part structure enlarged view of the utility model Figure 1 It is the B part structure enlarged view of the utility model

[0020] Figure 5 It is the A part structure enlarged view of the utility model Figure 1 It is the B part structure enlarged view of the utility model

[0021] Figure 6 It is the connection structure schematic diagram of friction axle and prism of the utility model.

[0022] Mark explanation:

[0023] 1, base, 2, heating coil, 3, drive assembly, 31, support plate, 32, circular ring, 33, limit ring, 34, roller, 35, round rod, 36, prism, 37, motor, 38, prism, 39, friction axle, 4, adjusting assembly, 41, air cylinder, 42, push rod, 43, sliding seat, 44, groove, 45, fixed rod, 46, spring. Specific implementation

[0024] The utility model is described in detail below, and the technical scheme in the embodiment of the utility model is clearly and completely described. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all. Based on the embodiment of the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the scope of protection of the utility model.

[0025] The utility model provides seamless steel pipe increasing diameter and reducing wall hot rolling mill calendering device through improvement, and the technical scheme of the utility model is:

[0026] As Figures 1-6 Seamless steel pipe increasing diameter and reducing wall hot rolling mill calendering device, including base 1, base 1 is provided with heating coil 2, base 1 is provided with drive assembly 3 and adjusting assembly 4, drive assembly 3 includes support plate 31, support plate 31 is fixedly connected with circular ring 32, three limit rings 33 are fixedly connected on circular ring 32, three limit rings 33 are slidably connected with round rod 35 in the inside, three round rods 35 are fixedly connected with roller 34, three round rods 35 are respectively through three rollers 34, base 1 is fixedly connected with motor 37, three round rods 35 are fixedly connected with prism 36, the output shaft of motor 37 is fixedly connected with prism 38, prism 38 is slidably connected with friction axle 39, friction axle 39 is connected with three prisms 36, base 1 is provided with adjusting assembly 4, the shape of prism 36 and friction axle 39 is fitted, three prisms 36 are simultaneously rotated when friction axle 39 rotates.

[0027] Further, adjusting assembly 4 includes sliding seat 43, sliding seat 43 is slidably connected on base 1, recess 44 is formed in sliding seat 43.

[0028] Further, the adjusting assembly 4 further comprises fixing rods 45, each of the three prisms 36 is fixedly connected with a fixing rod 45, the end of each of the three fixing rods 45 is slidably connected with the inner wall of the groove 44, the fixing rod 45 abuts against the inner wall of the groove 44, when the sliding seat 43 moves, the inner wall of the groove 44 forces the fixing rod 45 to move.

[0029] Further, the adjusting assembly 4 further comprises a cylinder 41 and a push rod 42, the cylinder 41 is fixedly connected with the base 1, the push rod 42 is fixedly connected with the output shaft of the cylinder 41, and the push rod 42 is rotatably connected with one end of the friction shaft 39.

[0030] Further, the adjusting assembly 4 further comprises a spring 46, the spring 46 is fixedly connected between the base 1 and the sliding seat 43, the spring 46 is located at the side of the sliding seat 43 which is away from the fixing rods 45, the elastic force of the spring 46 is applied to the sliding seat 43, and then to the three fixing rods 45, so when the friction shaft 39 moves, the elastic force of the spring 46 will promote the three rollers 34 to move towards the middle, and the steel pipe is slowly shaped by the elastic force, instead of being shaped by mechanical external force.

[0031] Further, the side surface of the friction shaft 39 and the side surface of the three prisms 36 are both provided with vertical lines, so when the friction shaft 39 rotates, the three prisms 36 will rotate accordingly, but in the horizontal direction, the friction shaft 39 can move relative to the three prisms 36, and the three prisms 36 will always be attached to the friction shaft 39.

[0032] Specific working method is: first, the steel pipe to be processed is placed between the three rollers 34, at this time, the motor 37 can be started, the rotation of the output shaft of the motor 37 drives the prism 38 to rotate, and then drives the friction shaft 39 to rotate, when the friction shaft 39 rotates, the vertical lines on the friction shaft 39 and the vertical lines on the three prisms 36 will generate a large static friction, so the rotation of the friction shaft 39 drives the three prisms 36 to rotate, the rotation of the three prisms 36 drives the rollers 34 and the round rods 35 to rotate, the rotation of the three rollers 34 gradually shapes the softened steel pipe, and the diameter is increased and the wall is reduced.

[0033] In order to control the outer diameter of the steel pipe, the distance between the three rollers 34 needs to be adjusted, at this time the cylinder 41 can be started, the push rod 42 is reciprocated by the cylinder 41, the friction shaft 39 is reciprocated, the sliding seat 43 is received by the spring 46, and the sliding seat 43 has a tendency to move to the friction shaft 39, so the three fixed rods 45 are pushed by the sliding seat 43, and the three fixed rods 45 are limited by the inner wall of the groove 44, at this time the three fixed rods 45 are close to the middle, and the three rollers 34 are close to the middle, so that the steel pipe between the three rollers 34 is extruded, so that the steel pipe is shaped, and since there is a large tangential friction force between the three prisms 36 and the friction shaft 39, the position of the friction shaft 39 limits the position of the three prisms 36, that is, the three rollers 34, when the three rollers 34 clamp the steel pipe, not only will rotate to help the steel pipe shape, but also will slowly move to the middle under the action of the spring 46 and the sliding seat 43, and gradually complete the shaping of the specific size.

[0034] The technical means disclosed by the utility model scheme is not limited to the technical means disclosed by the above technical means, and also includes technical solutions composed of equivalent replacement of the above technical features. The unfinished matters of the utility model belong to the common knowledge of those skilled in the art.

Claims

1. Calender device for a seamless steel pipe hot rolling mill for increasing the diameter and reducing the wall, comprising a base (1), characterized by the fact that: The base (1) is provided with a heating coil (2), the base (1) is provided with a driving assembly (3) and an adjusting assembly (4), the driving assembly (3) comprises a supporting plate (31), the supporting plate (31) is fixedly connected with a circular ring (32), the circular ring (32) is fixedly connected with three limiting rings (33), the interiors of the three limiting rings (33) are slidably connected with three round rods (35), the three round rods (35) are fixedly connected with rollers (34), the three round rods (35) penetrate through the three rollers (34) respectively, the base (1) is fixedly connected with a motor (37), the three round rods (35) are fixedly connected with prisms (36), the output shaft of the motor (37) is fixedly connected with a prism (38), the prism (38) is slidably connected with a friction shaft (39), the friction shaft (39) is connected with the three prisms (36), and the base (1) is provided with the adjusting assembly (4).

2. The seamless pipe sizing and wall-reducing hot-rolling mill calendering device according to claim 1, characterized in that: The adjusting assembly (4) comprises a sliding seat (43), the sliding seat (43) is slidably connected to the base (1), and the sliding seat (43) is provided with a groove (44).

3. The seamless pipe sizing and wall-reducing hot-rolling mill calendering device according to claim 2, characterized in that: The adjusting assembly (4) further comprises a fixing rod (45), the three prisms (36) are fixedly connected with the fixing rod (45), and the end portions of the three fixing rods (45) are slidably connected with the inner wall of the groove (44).

4. The seamless pipe sizing and wall-reducing hot-rolling mill calendering device according to claim 3, characterized in that: The adjusting assembly (4) further comprises a cylinder (41) and a push rod (42), the cylinder (41) is fixedly connected to the base (1), the push rod (42) is fixedly connected to the output shaft of the cylinder (41), and the push rod (42) is rotatably connected with one end of the friction shaft (39).

5. The seamless pipe sizing and wall-reducing hot-rolling mill calendering device according to claim 4, characterized in that: The adjusting assembly (4) further comprises a spring (46), the spring (46) is fixedly connected between the base (1) and the sliding seat (43), and the spring (46) is located on the side, away from the fixing rod (45), of the sliding seat (43).

6. The seamless pipe sizing and wall-reducing hot-rolling mill calendering device according to claim 1, characterized in that: The side surface of the friction shaft (39) and the side surface of the three prisms (36) are all provided with vertical lines.

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