Active y-type rolling mill for cold rolled steel bars

Abstract

A kind of active Y type rolling mill for cold rolled steel, including gear box, three output shafts are rotatably installed in gear box, three output shafts are evenly distributed on the same circle, and one same pinion is fixedly installed on three output shafts;A large gear is rotatably installed between the three pinions, the adjacent pinion and large gear are engaged, the output end of speed reducer motor is fixedly connected with one of the output shafts, and one universal shaft is fixedly connected on three output shafts, and the other end of each universal shaft is fixedly connected on a roller shaft box mechanism.The Y type rolling mill is automatically powered, and the structure is compact, the requirement for installation space is lower, and the turbine screw lift can provide larger rolling force, which is described in detail in combination with specific embodiments.

Description

Technical Field

[0001] This utility model relates to steel bar rolling mills, and more particularly to an active Y-type rolling mill for producing three-sided ribbed steel bars, belonging to the field of cold rolling equipment technology. Background Technology

[0002] The production of three-sided ribbed steel bars must be carried out using a three-roll mill. The three rolls of a three-roll mill are evenly distributed around the circumference. A three-roll mill is also called a Y-type mill. Depending on whether the mill is equipped with a drive power, three-roll mills are divided into active mills and passive mills. The passive mill method, also known as the drawing process, was commonly used in the past. In this process, the three-roll mill does not have a drive system; instead, traction rolls are placed upstream of the mill. The steel bar is wound several times on the traction rolls, and the driving force generated by the friction of the traction rolls pulls the steel bar, thus achieving passive rolling production. The new national standard GB13788-2024 for cold-rolled ribbed steel bars was released and implemented in September 2024. The new standard strictly requires the shape of three-sided ribbed steel bars, especially the height of the transverse ribs. Steel bars produced using the drawing process and passive method must pass through the traction rolls after forming, and straightening mechanisms are also required when producing straight steel bars. These two processes inevitably generate strong friction on the outer circle of the steel bar, especially abrading the transverse ribs, ultimately causing the product quality to fail to meet the standard requirements. Active rolling mills can overcome the above problems, but since all three rolls of an active rolling mill need to be driven, its drive system is generally more complex. For example, the active three-sided ribbed cold rolling mill for ribbed steel bars disclosed in Chinese patent application No. 2009101915613 is a rolling mill with all three rolls being active. Its drive mechanism is complex and the installation space is limited, which leads to a limitation on the rolling pressure (bearing capacity). Chinese patent CN120644462A discloses a three-sided ribbed active rolling mill for steel bar production, which also has the above problems. Summary of the Invention

[0003] The purpose of this utility model is to provide an active Y-type rolling mill for cold-rolled steel bars.

[0004] To achieve the purpose of this utility model, the following technical solution is adopted: A cold-rolled steel bar active Y-type rolling mill includes a gearbox, within which three output shafts are rotatably mounted, evenly distributed on the same circle, and each of the three output shafts is fixedly mounted with an identical small gear; a large gear is rotatably mounted between each of the three small gears, with adjacent small gears and large gears meshing; the output end of a reduction motor is fixedly connected to one of the output shafts; a universal joint is fixedly connected to each of the three output shafts, and the other end of each universal joint is fixedly connected to a roller box mechanism, wherein the roller box mechanism includes a roller box. The roller box input shaft is rotatably mounted on the roller box, and the universal joint is fixedly connected to the roller box input shaft. A first bevel gear is fixedly connected to the roller box input shaft. The roller is rotatably mounted on the roller box, and a second bevel gear is fixedly mounted on the roller. The first bevel gear and the second bevel gear mesh with each other. The roller ring is fixedly connected to the roller of the roller box mechanism. A slider is fixedly connected to the roller box mechanism. Three guide rails are installed on the base, and the three guide rails are distributed at 120-degree intervals. The three roller box mechanisms are respectively slidably engaged on the guide rails through the slider. The bodies of the three worm gear screw jacks are all fixedly connected to the base, and the moving ends are respectively connected to the roller box mechanisms.

[0005] Furthermore, the three large gears are rotatably connected to three intermediate shafts, which are fixedly connected to the gearbox.

[0006] Furthermore, the three large gears are fixedly connected to three intermediate shafts, which are rotatably connected to the gearbox.

[0007] The positive and beneficial technical effects of this utility model are as follows: This Y-type rolling mill is automatically powered and has a compact structure, requiring less installation space. The turbine screw jack can provide a large rolling force. The specific implementation method will be described in detail below. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the gear arrangement inside the gearbox.

[0009] Figure 2 This is a simplified structural diagram of part of the Y-shaped rolling mill.

[0010] Figure 3 This is a schematic diagram of the roll box mechanism mounted on the machine base. Detailed Implementation

[0011] To more fully explain the implementation of this utility model, implementation examples are provided. These implementation examples are merely illustrative of this utility model and do not limit its scope.

[0012] The present invention will be further explained in detail with reference to the accompanying drawings, in which the following references are made: 1: First output shaft; 2: First pinion; 3: Second output shaft; 4: Second pinion; 5: Third output shaft; 6: Third pinion; 7: First intermediate shaft; 8: First large gear; 9: Second intermediate shaft; 10: Second large gear; 11: Third intermediate shaft; 12: Third large gear; 13: Gearbox; 14: First universal joint; 15: First roller box input shaft; 16: First bevel gear; 17: Second bevel gear; 18: First roller shaft; 19: First roller ring; 20: Gearbox; 21: Second universal joint; 22: Machine base; 23: Guide rail; 24: Worm gear screw jack; 25: Second roller box mechanism; 26: Second roller ring; 27: Third roller box mechanism; 28: Third roller ring; 29: First roller box mechanism; 30: First roller box.

[0013] As shown in the attached figure, a driven Y-type rolling mill for cold-rolled steel bars includes a gearbox 13. Three output shafts are rotatably mounted inside the gearbox, evenly distributed on the same circle. The three shafts are designated as first drive shaft 1, second drive shaft 3, and third drive shaft 5. Each of the three output shafts has an identical small gear fixedly mounted on it. A first small gear 2 is fixedly mounted on the first drive shaft, a second small gear 4 is fixedly mounted on the second drive shaft, and a third small gear 6 is fixedly mounted on the third drive shaft. A large gear is rotatably mounted between each of the three small gears. The gears mesh with the large gears. The three large gears in the diagram are designated as the first large gear (8), the second large gear (10), and the third large gear (12). They are mounted via intermediate shafts, designated as the first intermediate shaft (7), the second intermediate shaft (9), and the third intermediate shaft (11). The three large gears can be rotatably mounted in either of the following two ways: First, the three large gears are rotatably connected to the three intermediate shafts, which are then fixedly connected to the gearbox. Second, the three large gears are fixedly connected to the three intermediate shafts, which are rotatably connected to the gearbox.

[0014] The output end of the geared motor 20 is fixedly connected to one of the output shafts, and a universal joint is fixedly connected to each of the three output shafts. Figure 2 The diagram shows two universal joints, namely the first universal joint 14 and the second universal joint 21, with the other end of each universal joint fixedly connected to a roller box mechanism. Figure 3The diagram shows three identical roller box mechanisms: a first roller box mechanism 29, a second roller box mechanism 25, and a third roller box mechanism 27. Taking the first roller box mechanism as an example, it includes a first roller box, a first roller box input shaft 15 rotatably mounted on a first roller box 30, a first universal joint 14 fixedly connected to the first roller box input shaft 14, a first bevel gear 16 fixedly connected to the first roller box input shaft 15, a first roller shaft 18 rotatably mounted on the first roller box, and a second bevel gear 17 fixedly mounted on the first roller shaft. The first bevel gear and the second bevel gear mesh with each other. The first roller ring 19 is fixedly connected to the outer end of the first roller shaft of the first roller shaft box mechanism; sliders are fixedly connected to each of the three roller shaft box mechanisms, and three guide rails are installed on the machine base 22. Figure 23 shows the guide rail corresponding to the first roller shaft box mechanism. The three guide rails are distributed at 120-degree intervals. The three roller shaft box mechanisms are respectively slidably engaged on the guide rails through sliders. The bodies of the three worm gear screw jacks are fixedly connected to the machine base, and the moving ends are respectively connected to the roller shaft box mechanisms. Figure 24 shows the worm gear screw jack connected to the first roller shaft box mechanism. The worm gear screw jacks connected to the other two roller shaft box mechanisms are the same as those on the first roller shaft box mechanism.

[0015] This Y-type rolling mill is driven by a geared motor, which inputs power to a gearbox via a drive shaft. The meshing of a large gear and a small gear drives the small gears on the other two drive shafts, achieving synchronous rotation of all three shafts and outputting power. The three drive shafts rotate in the same direction. Power is transmitted to three corresponding roller box mechanisms via universal joints. In these mechanisms, a first bevel gear meshes with a second bevel gear to drive the rotation of the three corresponding rollers. Roll rings are fixedly connected to the rollers; their rotation simultaneously drives the roll rings, achieving active rolling. A worm gear screw jack drives the roller box mechanism to slide on guide rails, adjusting the gap between the three roll rings and providing a large tonnage of rolling force. The worm gear screw jack is an existing product and can be selected according to process requirements.

[0016] After a detailed description of the embodiments of this utility model, those skilled in the art will clearly understand that various changes and modifications can be made without departing from the scope and spirit of the above-mentioned patent applications. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the scope of the technical solution of this utility model, and this utility model is not limited to the embodiments of the examples given in the specification.

Claims

1. An active Y-type rolling mill for cold-rolled steel bars, comprising a gearbox, characterized in that: Three output shafts are rotatably mounted inside the gearbox, evenly distributed on the same circle. Each of the three output shafts has an identical small gear fixedly mounted on it. A large gear is rotatably mounted between each of the three small gears, with adjacent small and large gears meshing. The output end of the geared motor is fixedly connected to one of the output shafts. A universal joint is fixedly connected to each of the three output shafts, and the other end of each universal joint is fixedly connected to a roller box mechanism. The roller box mechanism includes a roller box, an input shaft rotatably mounted on the roller box, and universal joints fixedly connected to the input shaft. The roller box has a first bevel gear fixedly connected to the input shaft. The roller shaft is rotatably mounted on the roller box. A second bevel gear is fixedly mounted on the roller shaft. The first bevel gear meshes with the second bevel gear. The roller ring is fixedly connected to the roller shaft of the roller box mechanism. A slider is fixedly connected to the roller box mechanism. Three guide rails are installed on the base. The three guide rails are distributed at 120-degree intervals. The direction of the three guide rails is consistent with the radial direction of the corresponding roller ring. The three roller box mechanisms are respectively slidably engaged on the guide rails by the slider. The bodies of the three worm gear screw jacks are all fixedly connected to the base, and the moving ends are respectively connected to the roller box mechanisms.

2. The active Y-type rolling mill for cold-rolled steel bars according to claim 1, characterized in that: The three large gears are rotatably connected to three intermediate shafts, which are fixedly connected to the gearbox.

3. The active Y-type rolling mill for cold-rolled steel bars according to claim 1, characterized in that: The three large gears are fixedly connected to the three intermediate shafts, which are rotatably connected to the gearbox.

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