A connecting structure at a speed regulating gear of a three-roller sizing machine set transmission case

Abstract

The utility model provides a kind of connection structure at three-roll sizing unit transmission case speed regulation gear, including speed regulation gear ring, speed regulation pinion, speed regulation gear, first interval sleeve, second interval sleeve, first bearing inner spacer ring, first rolling bearing, second bearing inner spacer ring, second rolling bearing, speed regulation pinion bore two sides are respectively set first rolling bearing, speed regulation gear bore two sides are respectively set second rolling bearing, speed regulation gear ring is connected with speed regulation pinion and speed regulation gear, speed regulation pinion bore sets up pinion boss step, speed regulation gear bore sets up gear boss step, first rolling bearing outer ring and pinion boss step between are set first interval sleeve, first rolling bearing inner ring and first bearing inner spacer ring are in abutment, second rolling bearing outer ring and gear boss step between are set second interval sleeve, second rolling bearing inner ring and second bearing inner spacer ring are in abutment.Positioning step can effectively resist axial force impact generated in rolling process.

Description

Technical Field

[0001] This utility model relates to the field of metal rolling transmission technology, and in particular to a connection structure at the speed regulating gear of the transmission box of a three-roll sizing mill. Background Technology

[0002] Currently, high-precision three-roll sizing mills are frequently used in the production of high-quality special steel bars and tubes. The principle of a three-roll sizing mill is to roll metal through the relative movement of three rollers. To achieve rolling of more sizes, spanning from small to large specifications, its transmission structure must be designed with multi-stage transmission to realize high-speed and low-speed switching. Three-roll sizing mills offer advantages such as compact design, high transmission efficiency, low energy consumption, ability to perform low-temperature rolling, uniform cross-sectional deformation, and improved product performance, thus gaining widespread application both domestically and internationally.

[0003] The drive output of the three-roll sizing mill is connected to the main motor via a transmission box, then distributed by an intermediate distribution box, and finally connected to the three-roll mill to achieve the rolling of the workpiece. The transmission box is generally designed with two output modes: high speed ratio and low speed ratio. Figure 1 As shown, the speed-regulating pinion 12 of the transmission box is supported and driven by rolling bearings. The outer ring of the rolling bearing abuts against the retaining ring 14 and the spacer sleeve 16, and the inner ring of the rolling bearing abuts against the inner spacer ring. The gears are then locked in place by the locking nut 18. The speed-regulating gear 13 of the transmission box is also supported and driven by rolling bearings. The outer ring of the rolling bearing abuts against the retaining ring 15 and the spacer sleeve 17, and the inner ring of the rolling bearing abuts against the inner spacer ring. A connecting cover 19 abuts against the rolling bearing, and the connecting cover 19 is connected by bolts and a shaft. The internal spline of the speed-regulating gear ring 11 mates with the external splines of the speed-regulating pinion 12 and the speed-regulating gear 13 to achieve high-speed / low-speed switching. In existing three-roll sizing mills, the speed-regulating gears of the transmission box generally adopt this connection structure to cope with the impact forces during the rolling process.

[0004] In the above-mentioned connection structure, the retaining rings installed in the inner holes of the speed regulating pinion and speed regulating gear are mostly made of standard materials and sizes. Their dimensions are too small and their strength is insufficient. During the load-bearing process, the speed regulating pinion and speed regulating gear are subjected to axial force impact. After a period of use, the retaining rings will wear out severely or even break, affecting the axial position of the speed regulating pinion and speed regulating gear, and even causing the speed regulating gear ring to be damaged by tooth loss. Utility Model Content

[0005] This utility model proposes a connection structure for the speed regulating gear in the transmission box of a three-roll sizing mill, in order to solve the problems caused by the easy wear of the retaining ring in the existing connection structure, which affects the axial position of the speed regulating pinion and gear, and even causes the speed regulating gear ring to be damaged by tooth breakage.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a connection structure for the speed regulating gear of a three-roll sizing mill transmission box, comprising a speed regulating gear ring, a speed regulating pinion, a speed regulating gear, a first spacer sleeve, a second spacer sleeve, a first bearing inner spacer ring, a first rolling bearing, a second bearing inner spacer ring, and a second rolling bearing. First rolling bearings are respectively arranged on both sides of the inner hole of the speed regulating pinion, and second rolling bearings are respectively arranged on both sides of the inner hole of the speed regulating gear. The speed regulating gear ring is located in the middle of the speed regulating pinion and the speed regulating gear and is connected to both. A pinion protrusion is machined into the inner hole of the speed regulating pinion, and a large gear protrusion is machined into the inner hole of the speed regulating gear. A first spacer sleeve is arranged between the outer ring of the first rolling bearing and the pinion protrusion ring, and the inner ring of the first rolling bearing abuts against the first bearing inner spacer ring. A second spacer sleeve is arranged between the outer ring of the second rolling bearing and the large gear protrusion ring, and the inner ring of the second rolling bearing abuts against the second bearing inner spacer ring.

[0007] Preferably, the speed regulating pinion is provided with an external spline, which is connected to the internal spline of the speed regulating gear ring.

[0008] Preferably, the speed regulating gear is provided with an external spline, which is connected to the internal spline of the speed regulating gear ring.

[0009] Compared with the prior art, the advantages and positive effects of this utility model are as follows: The connection structure of this utility model has virtually no impact on other structures and dimensions in the prior art. It can be applied to most speed-regulating gears. After the improvement, the structure is simple and the assembly is more convenient. It can effectively resist the axial force impact during the rolling process, greatly improve the problem of easy wear of the retaining ring for the hole, and even avoid the occurrence of tooth breakage after the retaining ring breaks. At the same time, the increase in the contact length of the speed-regulating gear ring can reduce the wear rate of the spline fit and the risk of tooth breakage to a certain extent, effectively improving the shaft life. Attached Figure Description

[0010] Figure 1 This is a cross-sectional schematic diagram of the connection structure at the speed regulating gear of the transmission box in a three-roll sizing mill in the prior art.

[0011] Figure 2 This is a cross-sectional schematic diagram of the connection structure at the speed regulating gear of the transmission box of the three-roll sizing mill unit according to an embodiment of the present invention.

[0012] Figure 3 This is a cross-sectional schematic diagram of the speed-regulating pinion in an embodiment of the present invention.

[0013] Figure 4 This is a cross-sectional structural diagram of the speed-regulating gear in an embodiment of the present invention.

[0014] Figure 5 This is a cross-sectional structural diagram of the speed regulating gear ring in an embodiment of this utility model. Detailed Implementation

[0015] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0016] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification. Example

[0017] like Figure 2 As shown, this embodiment provides a connection structure at the speed regulating gear of the transmission box of a three-roll sizing mill, including a speed regulating gear ring 21, a speed regulating pinion 22, a speed regulating gear 23, a first spacer sleeve 24, a second spacer sleeve 25, a first bearing inner spacer ring 26, a first rolling bearing 27, a second bearing inner spacer ring 28, and a second rolling bearing 29.

[0018] like Figure 3 As shown, a pinion step 221 is machined from the inner hole of the speed regulating pinion 22, and an external spline 222 is machined from the outside.

[0019] like Figure 4 As shown, on the speed regulating gear 23, a gear protrusion step 231 is machined from the inner hole of the speed regulating gear 23, and an external spline 232 is machined from the outside.

[0020] like Figure 2 and Figure 3 As shown, the speed regulating pinion 22 is supported by the first rolling bearings 27 installed on both sides of the inner hole. A first spacer sleeve 24 is provided between the outer ring of the first rolling bearing 27 and the pinion protrusion 221 positioned inside the speed regulating pinion 22. The inner ring of the first rolling bearing 27 abuts against the inner spacer ring 26 of the first bearing and is locked on the shaft by the lock nut 30 after assembly.

[0021] like Figure 2 and Figure 4 As shown, the speed regulating gear 23 is supported by the second rolling bearings 29 installed on both sides of the inner hole. A second spacer sleeve 25 is provided between the outer ring of the second rolling bearing 29 and the large gear protrusion step 231 positioned inside the speed regulating gear 23. The inner ring of the second rolling bearing 29 abuts against the inner spacer ring 28 of the second bearing. After the assembly is completed, the connecting cover 31 abuts against the second rolling bearing 29, and the connecting cover 31 is connected by bolts and shaft.

[0022] like Figure 5 , Figure 2 , Figure 3 and Figure 4 As shown, the speed regulating gear ring 21 is located between the speed regulating pinion 22 and the speed regulating gear 23. By amplifying the speed regulating gear ring 21 through an external power source, the internal spline 211 is connected to the external spline 222 of the pinion and the external spline 232 of the gear. In this structure, the contact length between the speed regulating gear ring 21 and the speed regulating pinion 22 and the speed regulating gear 23 is increased.

[0023] In this embodiment, the retaining rings for axial positioning of the speed-regulating pinion 22 and the speed-regulating gear 23 are eliminated. An integral manufacturing design with a raised step at the inner hole is adopted, which has virtually no impact on other structures and dimensions in the prior art and can be applied to most speed-regulating gears. This improvement simplifies the structure, makes assembly easier, improves assembly accuracy, and enhances transmission stability. Furthermore, the outer diameters at both ends of the inner holes of the speed-regulating pinion 22 and the speed-regulating gear 23 are larger than the outer diameter of the middle step. The inner diameter of the spacer sleeve is consistent with the outer diameter at the step of the inner hole of the speed-regulating gear. The inner holes of the speed-regulating pinion 22 and the speed-regulating gear 23 are used to mate with the outer surface of the spacer sleeve, effectively resisting axial force impact during rolling. This significantly improves the problem of easy wear of the retaining rings and can even prevent tooth breakage after the retaining ring breaks. In addition, the increased contact length of the speed-regulating gear ring 21 can reduce the wear rate of the spline fit and the risk of tooth breakage to a certain extent, effectively improving the shaft life.

[0024] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A connection structure at the speed regulating gear of a transmission box in a three-roll sizing mill, comprising a speed regulating gear ring, a speed regulating pinion, a speed regulating gear, a first spacer sleeve, a second spacer sleeve, a first bearing inner spacer ring, a first rolling bearing, a second bearing inner spacer ring, and a second rolling bearing; the first rolling bearings are respectively arranged on both sides of the inner hole of the speed regulating pinion, and the second rolling bearings are respectively arranged on both sides of the inner hole of the speed regulating gear; the speed regulating gear ring is located in the middle of the speed regulating pinion and the speed regulating gear and is connected to the speed regulating pinion and the speed regulating gear, characterized in that: The inner hole of the speed-regulating pinion is machined with a pinion convex step, and the inner hole of the speed-regulating gear is machined with a large gear convex step. A first spacer sleeve is provided between the outer ring of the first rolling bearing and the pinion convex step. The inner ring of the first rolling bearing abuts against the inner spacer ring of the first bearing. A second spacer sleeve is provided between the outer ring of the second rolling bearing and the large gear convex step. The inner ring of the second rolling bearing abuts against the inner spacer ring of the second bearing.

2. The connection structure at the speed regulating gear of the transmission box of the three-roll sizing mill unit according to claim 1, characterized in that, The speed regulating pinion is provided with an external spline, which is connected to the internal spline of the speed regulating gear ring.

3. The connection structure at the speed regulating gear of the transmission box of the three-roll sizing mill as described in claim 1, characterized in that: The speed regulating gear is provided with an external spline, which is connected to the internal spline of the speed regulating gear ring.

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