Four-shaft balance transmission device of high-speed rolling mill
By introducing a four-axis balanced transmission device into the rolling mill, using a small balance block and a 1:3 transmission ratio balanced crank motion inertia, the problem of unstable rolling mill at high speeds is solved, the production efficiency is improved and the equipment life is extended.
Patent Information
- Application Number
- CN202421770361.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-07-25
AI Technical Summary
After the existing rolling mill transmission device increases the rotation speed, the moment of motion inertia increases, resulting in unstable equipment and high noise, limiting the production efficiency and life of the rolling mill.
Using a four-axis balanced transmission device, by setting concentric gears with small balance blocks on both sides of the crank gear, the 1:3 transmission ratio balances the moment of motion inertia of the crank, which increases the balance effect and reduces vibration and noise.
It improves the production efficiency of the rolling mill, extends the service life of the equipment, reduces noise, and achieves stable operation of high-speed rolling steel.
Smart Images
Figure CN223250218U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a high-speed rolling mill, in particular to a transmission device of the high-speed rolling mill. Background Art
[0002] Rolling mill parameters include feed rate, wall reduction, diameter reduction (elongation), and roll shape. Assuming these parameters remain constant, increasing the reciprocating frequency of the mill and raising the main machine speed will proportionally increase production capacity and output. Therefore, simply increasing the speed can improve production efficiency. However, as the speed increases, the moment of inertia of moving parts such as the mill roll assembly and connecting rods also increases exponentially, reducing equipment stability and increasing noise.
[0003] The existing rolling mill transmission mechanism is a two-shaft transmission mechanism. Two driving gears are mounted on the first shaft as the power input shaft, and two crank gears with counterweights are mounted on the second shaft. During operation, the two driving gears on the first shaft rotate counterclockwise and engage the crank gears on the second shaft. The crank gears rotate clockwise, and the counterweights drive the pins on the frame through the connecting rods, causing the frame to roll. At this point, the connecting rod and the crankshaft rotate in a circular motion around the center of the crank gear. If the vibration of the crank gear cannot be fully or even largely balanced at this connection point during movement, even a slight increase in the speed will cause the crank gear to vibrate violently and make extremely loud noise, significantly reducing the service life of the rolling mill. To ensure the life of the rolling mill, the speed must be limited, making high-speed rolling impossible. Summary of the Invention
[0004] The utility model aims to solve the above-mentioned defects of the prior art and provides a four-axis balanced transmission device for a high-speed rolling mill.
[0005] Compared with the existing equipment, the utility model improves the rolling efficiency and prolongs the service life of the rolling mill.
[0006] The utility model is implemented as follows: a four-axis balanced transmission device for a high-speed rolling mill, which includes a power input shaft and a shaft with a crank gear, the power input shaft is provided with a transmission gear, the crank gear is provided with a counterweight block and a connecting rod of a drive frame; it is characterized in that a transmission shaft is provided on both sides of the shaft where the crank gear is located, and a gear with a small balance block is provided on each transmission shaft, the gear on one side is located between the power input shaft gear and the crank gear shaft and is meshed with them, and the transmission shaft on the other side is provided with a gear with a small balance block meshed with the crank gear, the diameter of the two gears with small balance blocks is the same as that of the crank gear, and the two gears with small balance blocks can be interchanged.
[0007] The four-axis balancing transmission device of a high-speed rolling mill is described, wherein the counterweight block is two concentrically opposed fan-shaped parts, the small balancing block is a fan-shaped part, and when the symmetry axes of the two fan-shaped parts of the counterweight block are in a vertical position, the fans of the two small balancing blocks are arranged in the same direction, and their symmetry axes are also arranged vertically.
[0008] In the four-axis balanced transmission device of a high-speed rolling mill, the diameter ratio of the transmission gear and the crank gear is 1:3.
[0009] The present invention incorporates a shaft on either side of the existing second shaft, each equipped with a gear with a small counterweight that meshes with the crank gear. During installation, ensure that the small counterweights on the gears on the two newly added shafts are positioned opposite the existing crank gear. This allows the power input shaft's gear to mesh with the crank gear through the newly added gear, while the crank gear also meshes with the gear on the other side. Consequently, when the power input shaft rotates clockwise, the shaft containing the crank gear also rotates clockwise, while the two newly added shafts rotate counterclockwise. When the crank gear rotates 90 degrees clockwise to the right, the small counterweights on its left and right gears are positioned 90 degrees to the left. Regardless of the crank gear's rotation angle, the small counterweights on its left and right gears remain aligned with the counterweights on the crank gear, effectively balancing the crank's moment of inertia. Since the diameter ratio of the power shaft gear, crank gear, and newly added gear is 1:3, resulting in a transmission ratio of 3:1, when the power gear rotates three times, the crank gear rotates one revolution, the connecting rod completes one cycle, and the rolling mill completes one cycle. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The present invention will be further described below with reference to the accompanying drawings:
[0011] Figure 1 It is a schematic structural diagram of the utility model. DETAILED DESCRIPTION
[0012] See Figure 1 , 7 in the figure is a load, a four-axis balanced transmission device for a high-speed rolling mill, which includes a power input shaft and a shaft with a crank gear 4, the power input shaft is provided with a transmission gear 1, the crank gear is provided with a counterweight 5 and a connecting rod 6 for driving a frame; there is a transmission shaft on each side of the shaft where the crank gear is located, and each transmission shaft is provided with a gear 2, 9 with a small balance block 3, 8, the gear 9 on one side is located between the power input shaft gear and the crank gear shaft and meshes with the crank gear 4, and the transmission shaft on the other side is provided with a gear 9 with a small balance block 8 meshing with the crank gear, the diameters 2, 9 of these two gears with small balance blocks 3, 8 are the same as those of the crank gear, and the two gears with small balance blocks can be interchanged.
[0013] The four-axis balancing transmission device of a high-speed rolling mill is described, wherein the counterweight block is two concentrically opposed fan-shaped parts, the small balancing block is a fan-shaped part, and when the symmetry axes of the two fan-shaped parts of the counterweight block are in a vertical position, the fans of the two small balancing blocks are arranged in the same direction, and their symmetry axes are also arranged vertically.
[0014] In the four-axis balanced transmission device of a high-speed rolling mill, the diameter ratio of the transmission gear and the crank gear is 1:3.
Claims
1. A four-axis balanced transmission device for a high-speed rolling mill, comprising a power input shaft and a shaft with a crank gear, wherein the power input shaft is provided with a transmission gear, and the crank gear is provided with a counterweight and a connecting rod for driving a frame; characterized in that: There is a transmission shaft on each side of the shaft where the crank gear is located, and a gear with a small balance block is set on each transmission shaft. The gear on one side is located between the power input shaft gear and the crank gear shaft and is engaged with them. The transmission shaft on the other side is provided with a gear with a small balance block that is engaged with the crank gear. The diameter of these two gears with small balance blocks is the same as that of the crank gear, and the two gears with small balance blocks can be interchanged.
2. A four-axis balanced transmission device for a high-speed rolling mill according to claim 1, characterized in that: The counterweight block is two concentrically opposed sector-shaped pieces, and the small balancing block is a sector-shaped piece. When the symmetry axes of the two sector-shaped pieces of the counterweight block are in a vertical position, the sectors of the two small balancing blocks are arranged in the same direction, and their symmetry axes are also arranged vertically.
3. The four-axis balanced transmission device for a high-speed rolling mill according to claim 1, characterized in that: The diameter ratio of the transmission gear and the crank gear is 1:3.