Hot rolling mill long guide roll assembly with self-locking mortise and tenon connection
Patent Information
- Application Number
- CN202522379877.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-10
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-11-10
AI Technical Summary
而现有的热轧机后台长导辊组件多采用销轴、螺栓或联轴器的连接形式，连接处存在较大间隙，在高速旋转过程中易产生振动和晃动，导致连接处的导辊棱边或螺栓销轴与钢管外表面发生碰撞，造成钢管表面损伤，严重影响产品质量，使成材率下降
本申请所述的自锁式榫卯连接的热轧机长导辊组件，其各段导辊部件的组装连接处通过公榫连接头和母榫连接座的榫卯结构实现紧密的机械互锁，在高速旋转过程中不易发生振动和晃动，不会因振动和晃动而碰撞损伤钢管表面，保障产品质量；并且该长导辊组件利用材料自身的弹性变形实现无紧固件的高刚性连接，不会有销轴或螺栓发生松动，降低了检修频率，使可靠性得到了极大提升。
Smart Images
Figure CN224895243U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of steel pipe processing, and specifically relates to a self-locking tenon and mortise connection hot rolling mill long guide roll assembly. Background Technology
[0002] Long guide rolls, which guide and transport high-temperature steel pipes during hot rolling, are typically assembled from multiple sections due to their considerable length. However, existing long guide roll assemblies in the back row of hot rolling mills often use pins, bolts, or couplings for connection. These connections have significant gaps, which can easily lead to vibration and swaying during high-speed rotation. This can cause the edges of the guide rolls or the bolts / pins at the connection points to collide with the outer surface of the steel pipe, resulting in surface damage. This severely impacts product quality and reduces the yield.
[0003] In addition, bolts or pins at the connection points are prone to loosening, requiring frequent maintenance, which increases equipment downtime and maintenance costs. According to statistics, our company experienced 11 downtimes in 2023 due to long guide roller failures, totaling 353 minutes, with quarterly maintenance costs reaching 4,800 yuan.
[0004] Therefore, there is an urgent need to develop another type of long guide roller assembly with different connection methods. Summary of the Invention
[0005] In view of the above, this application provides a self-locking tenon and mortise joint hot rolling mill long guide roll assembly, which includes a first guide roll section, a second guide roll section, a third guide roll section, a male tenon connector and a female tenon connector. A female tenon connector is fixedly connected to the connecting end face of the first guide roller section; a male tenon connector is fixedly connected to one end of the second guide roller section, and a female tenon connector is fixedly connected to the other end; a male tenon connector is fixedly connected to the connecting end face of the third guide roller section. The male tenon connector has a protruding square head integrally connected to its end face, and the female tenon connector has a corresponding square groove on its end face. The square head of the male tenon connector is inserted into the corresponding square groove of the female tenon connector in an interference fit, so that the first guide roller, the second guide roller and the third guide roller are connected in sequence.
[0006] This type of mortise and tenon joint, when axially inserted, generates increasing contact stress with increasing insertion depth, forming a tight mechanical interlocking structure. It utilizes the material's own elastic deformation to achieve a high-rigidity connection without fasteners. During operation, a motor drives a long guide roller to rotate at high speed. This self-locking mortise and tenon structure, with its excellent shear resistance and self-locking characteristics, ensures stability at the connection point when transmitting torque and bearing loads, eliminating harmful vibrations and relative displacements, and preventing damage to the steel pipe surface due to vibration and shaking. Furthermore, this connection structure requires no external fasteners, preventing loosening of pins or bolts, reducing maintenance frequency, and greatly improving reliability.
[0007] Furthermore, both the male tenon connector and the female tenon connector are frustum-shaped.
[0008] Preferably, the slope α of the frustum is 3°.
[0009] The shape of the male tenon connector and the female tenon connector, compared to the original coupling connection, has no protruding parts, making the transition at the connection smoother and avoiding scratches on the steel pipe during transportation.
[0010] Furthermore, the outer edges of the male tenon connector and the female tenon connector are both smooth arc-shaped transition surfaces. The arc-shaped transition surfaces completely eliminate all sharp edges that may scratch the steel pipe. When the steel pipe comes into contact with the end of the guide roller, a smooth transition can be achieved, ensuring the surface quality of the steel pipe.
[0011] Through the above technical solutions, this utility model has at least the following beneficial effects: The self-locking tenon-and-mortise joint hot rolling mill long guide roll assembly described in this application achieves tight mechanical interlocking at the assembly and connection points of each section of the guide roll component through the tenon-and-mortise structure of the male tenon connector and the female tenon connector. During high-speed rotation, it is not prone to vibration and shaking, and will not collide and damage the surface of the steel pipe due to vibration and shaking, thus ensuring product quality. Furthermore, this long guide roll assembly utilizes the elastic deformation of the material itself to achieve a high-rigidity connection without fasteners, preventing the loosening of pins or bolts, reducing maintenance frequency, and greatly improving reliability.
[0012] In addition, the frustum-shaped and arc-shaped transition surfaces of the male tenon connector and the female tenon connector completely eliminate the possibility of scratching or abrading the steel pipe, further ensuring the surface quality of the steel pipe. Attached Figure Description
[0013] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of this utility model in a schematic manner. Therefore, they only show the components related to this utility model.
[0014] Figure 1 This is a schematic diagram of the overall structure of the hot rolling mill long guide roll assembly with self-locking tenon and mortise connection as described in the embodiments of this application. Figure 2 for Figure 1 Enlarged view of point A in the middle. Detailed Implementation
[0015] In the description of this application, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships are for illustrative purposes only and should not be construed as limiting this patent. If terms such as "first" and "second" are used for descriptive purposes only, they should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of the stated features. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.
[0016] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0017] refer to Figure 1 and Figure 2 A self-locking tenon and mortise joint hot rolling mill long guide roll assembly includes a first guide roll part 1, a second guide roll part 2, a third guide roll part 3, a male tenon connector 4, and a female tenon connector 5. The first guide roller section 1 is fixedly connected to a female tenon connector 5 at its connecting end face; the second guide roller section 2 is fixedly connected to a male tenon connector 4 at one end and a female tenon connector 5 at the other end; and the third guide roller section 3 is fixedly connected to a male tenon connector 4 at its connecting end face. The male tenon connector 4 has a protruding square head 401 integrally connected to its end face, and the female tenon connector 5 has a corresponding square groove 501 on its end face. The square head 401 of the male tenon connector 4 is embedded in the corresponding square groove 501 of the female tenon connector 5 in an interference fit, so that the first guide roller 1, the second guide roller 2 and the third guide roller 3 are connected in sequence.
[0018] This type of mortise and tenon joint, when axially inserted, generates increasing contact stress with increasing insertion depth, forming a tight mechanical interlocking structure. It utilizes the material's own elastic deformation to achieve a high-rigidity connection without fasteners. During operation, the motor drives the long guide roller assembly to rotate at high speed. This self-locking mortise and tenon structure, with its excellent shear resistance and self-locking characteristics, ensures stability at the connection point when transmitting torque and bearing loads, eliminating harmful vibrations and relative displacements, and preventing damage to the steel pipe surface from vibrations and shaking. Furthermore, this connection structure requires no external fasteners, preventing loosening of pins or bolts, reducing maintenance frequency, and greatly improving reliability.
[0019] refer to Figure 2 Both the male tenon connector 4 and the female tenon connector 5 are frustum-shaped, with an inclination α of 3°. Compared to the original coupling connection method, this shape of the male tenon connector 4 and the female tenon connector 5 has no protruding parts, making the transition at the connection of the two guide rollers smoother and avoiding scratches on the steel pipe during transportation.
[0020] refer to Figure 2 The outer edges of the male tenon connector 4 and the female tenon connector 5 are both smooth arc-shaped transition surfaces 6. The arc-shaped transition surface 6 completely eliminates all sharp edges that may scratch the steel pipe. When the steel pipe comes into contact with the end of the guide roller, a smooth transition can be achieved, ensuring the surface quality of the steel pipe.
[0021] Since the aforementioned long guide roller assembly was modified and applied in our company, no failures caused by friction of the long guide rollers have occurred since 2024. The failure rate has been significantly reduced, and maintenance costs have been greatly reduced. Furthermore, the replacement cycle has been extended from once every 2 months to at least 6 months, saving approximately RMB 126,000 in spare parts costs and RMB 256,000 in replacement costs annually, for a total annual saving of approximately RMB 501,000. In addition, it can minimize surface scratches on steel pipes, improve yield, and enhance product quality.
[0022] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Based on the present utility model and the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A self-locking tenon-and-mortise joint hot rolling mill long guide roll assembly, characterized in that: It includes a first guide roller section (1), a second guide roller section (2), a third guide roller section (3), a male tenon connector (4), and a female tenon connector (5); The first guide roller section (1) is fixedly connected to a female tenon connector (5) at its connecting end face; the second guide roller section (2) is fixedly connected to a male tenon connector (4) at one end and to a female tenon connector (5) at the other end; and the third guide roller section (3) is fixedly connected to a male tenon connector (4) at its connecting end face. The male tenon connector (4) has a protruding square head (401) integrally connected to its end face, and the female tenon connector (5) has a corresponding square groove (501) on its end face. The square head (401) of the male tenon connector (4) is embedded in the corresponding square groove (501) of the female tenon connector (5) in an interference fit, so that the first guide roller (1), the second guide roller (2) and the third guide roller (3) are connected in sequence.
2. The self-locking tenon-and-mortise connection hot rolling mill long guide roll assembly according to claim 1, characterized in that: Both the male tenon connector (4) and the female tenon connector (5) are frustum-shaped.
3. The self-locking tenon-and-mortise connection hot rolling mill long guide roll assembly according to claim 2, characterized in that: The slope α of the frustum is 3°.
4. A self-locking tenon-and-mortise connected long guide roll assembly for a hot rolling mill according to claim 1 or 2, characterized in that: The outer edge of the male tenon connector (4) and the outer edge of the female tenon connector (5) are both smooth arc-shaped transition surfaces (6).