A short stress line rolling mill press nut fixing structure
By designing a fixed structure including bearing seat, pull rod, positioning sleeve and stop-rotation convex in a short stress line rolling mill, the problem of low strength of the stop-rotation structure of the pressed nut is solved, and high-strength and stable nut fixation is achieved to ensure the rolling mill's Long-term stable operation.
Patent Information
- Application Number
- CN202110934452.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-08-16
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2041-08-16
AI Technical Summary
In existing short stress line rolling mills, the stop-rotation structure of the pressed nut is low and easy to be damaged, resulting in loosening of the nut and bounce of the rolling mill, affecting product quality.
A fixed structure including bearing seat, tie rod, pressing nut, positioning sleeve, balance nut and stop rotating convex is designed. The nut is stably positioned and stopped rotating through threaded connection and elastic balance sleeve to ensure that the nut does not rotate with the tie rod, and Adjust the position of the positioning sleeve by threaded connection of the gland and the round nut to adjust the clearance.
It provides stable and sufficient rotation stopping force, improves the fixing strength and service life of the nut, and ensures the long-term stable operation of the rolling mill and product quality.
Smart Images
Figure CN113522986B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of short stress line rolling mills, in particular to a short stress line rolling mill press-down nut fixing structure. Background Art
[0002] The press-down nut is an important part of the short stress line rolling mill. Under normal circumstances, it fits tightly with the spherical pad installed on the bearing seat and cannot rotate with the tie rod. It is stationary relative to the bearing seat and needs to be restricted by relevant measures. To prevent the press-down nut from rotating with the tie rod, the general practice is to set external teeth on the outer circumference of the press-down nut and use a stop pin tooth set on the side of the bearing seat to insert between the two teeth to complete the stop. However, in actual use, this structure has low strength, often damaged and loses its anti-rotation ability, and the press-down nut loosens, causing the rolling mill to bounce significantly, resulting in damage to the rolling mill and unqualified quality of rolled products. Summary of the invention
[0003] In view of the deficiencies in the prior art, the present invention provides a short stress line rolling mill hold-down nut fixing structure, which can simultaneously stop the rotation of the balance nut and the hold-down nut and is firm and reliable.
[0004] The present invention is achieved through the following technical scheme, which provides a short stress line rolling mill press-down nut fixing structure, including a bearing seat, a pull rod passing through the bearing seat and a press-down nut threaded on the pull rod, the bearing seat is provided with a countersunk hole adapted to the press-down nut, and also includes a positioning sleeve sleeved on the pull rod, the positioning sleeve is located above the press-down nut and is fixed to the bearing seat, the pull rod is threadedly connected with a balancing nut supporting the positioning sleeve, the balancing nut is located between the positioning sleeve and the press-down nut, the lower end of the positioning sleeve is fixed with a plurality of stop protrusions, the balancing nut is provided with a slot A for allowing the stop protrusion to pass through, and the upper end of the press-down nut is provided with a slot B for allowing the stop protrusion to be inserted.
[0005] In this solution, a plurality of anti-rotation protrusions are fixedly connected to the lower end of the positioning sleeve, and the anti-rotation protrusions pass through slots A and B, so that the balancing nut and the push-down nut are positioned with the positioning sleeve in the circumferential direction, and can provide stable and sufficient anti-rotation force, effectively ensuring that the balancing nut and the push-down nut do not rotate with the rotation of the pull rod. When the pull rod rotates, the push-down nut is pressed down through the thread, thereby driving the bearing seat to move downward. The balancing nut is used to support structures such as the positioning sleeve and the bearing seat. A certain gap is maintained between the balancing nut and the push-down nut so that the weight is supported on the balancing nut. In a static state, the push-down nut is not subjected to force, and at the same time, the bearing seat is driven to move upward through the balancing nut.
[0006] As an optimization, it also includes a gland and a round nut. The upper end of the countersunk hole is provided with a round nut countersunk hole that matches the outer diameter of the round nut. The gland is fixed to the bearing seat by bolts and the round nut is pressed into the round nut countersunk hole. The inner ring of the gland and the inner ring of the round nut are both threadedly connected to the positioning sleeve. The threads of the gland and the round nut have opposite rotation directions. In this scheme, the threads of the gland and the round nut have opposite rotation directions. Because the gland presses the round nut into the round nut countersunk hole, the positioning sleeve and the gland are fixed so that the positioning sleeve cannot rotate. At the same time, the upper and lower positions of the positioning sleeve can be adjusted by removing the gland and adjusting the positional relationship between the gland round nut and the positioning sleeve, thereby facilitating the adjustment of the gap between the balance nut and the pressed nut.
[0007] As an optimization, a tie rod passing hole is opened on the gland, and a sealing ring adapted to the tie rod is installed in the tie rod passing hole. The tie rod passing hole in this solution is convenient for the tie rod to pass through, and the sealing ring plays a sealing role.
[0008] As an optimization, the anti-rotation protrusions are provided with three and are evenly distributed along the circumference. In this solution, the anti-rotation protrusions are provided with three and are evenly distributed along the circumference, which can play a good anti-rotation role and improve the practical life.
[0009] As an optimization, an elastic balancing sleeve is installed between the balancing nut and the positioning sleeve. The elastic balancing sleeve in this solution plays a buffering role between the balancing nut and the positioning sleeve.
[0010] As an optimization, the anti-rotation convex is arranged on the outer side of the lower end surface of the positioning sleeve, and the elastic balancing sleeve is located on the inner side of the anti-rotation convex. In this solution, the anti-rotation convex is arranged on the outer side of the lower end surface of the positioning sleeve, so as to be supported on the inner side of the lower end surface of the positioning sleeve by the elastic balancing sleeve.
[0011] As an optimization, a spherical pad located below the pressing nut is mounted on the pull rod. In this solution, the pressing nut provides downward pressure to the bearing seat through the spherical pad.
[0012] The beneficial effects of the present invention are as follows: a short stress line rolling mill hold-down nut fixing structure of the present invention is quick to install and adjust, has high strength, eliminates the structure and connectors between the balancing nut and the hold-down nut to prevent relative rotation, and more importantly, can provide stable and sufficient anti-rotation force, effectively ensuring that the balancing nut and the hold-down nut do not shift with the rotation of the pull rod, ensuring that the rolling mill maintains a balanced effect, and the short stress line rolling mill can stably exert its equipment performance for a long time. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a cross-sectional view of the present invention;
[0014] Figure 2 A top view of the press-down nut of the present invention;
[0015] Figure 3 A top view of the balancing nut of the present invention;
[0016] As shown in the figure:
[0017] 1. Pull rod, 2. Spherical washer, 3. Press-down nut, 4. Balance nut, 5. Bearing seat, 6. Elastic balance sleeve, 7. Pressure cover, 8. Internal thread A, 9. Positioning sleeve, 10. External thread A, 11. External thread B, 12. Round nut, 13. Internal thread B, 14. Stop cam, 15. Notch A, 16. Notch B. DETAILED DESCRIPTION
[0018] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.
[0019] like Figures 1 to 3 As shown, a short stress line rolling mill press-down nut fixing structure of the present invention includes a bearing seat 5, a pull rod 1 passing through the bearing seat 5, and a press-down nut 3 threadedly connected to the pull rod 1, the pull rod 1 is provided with a spherical pad 2 located below the press-down nut 3, and the lower end surface of the press-down nut 3 is provided with a spherical surface corresponding to the spherical pad 2.
[0020] The bearing seat 5 is provided with a countersunk hole adapted to the pressing nut 3, and the pressing nut 3 presses the spherical pad 2 to the bottom of the countersunk hole.
[0021] It also includes a positioning sleeve 9 sleeved on the pull rod 1. The positioning sleeve 9 is located above the pressing nut 3 and is fixedly connected to the bearing seat 5. The positioning sleeve 9 is located at the opening of the countersunk hole.
[0022] It also includes a gland 7 and a round nut 12. The gland 7 covers the opening of the countersunk hole. The gland 7 is fixed to the bearing seat 5 by bolts. A tie rod passing hole is opened on the gland 7. A sealing ring adapted to the tie rod 1 is installed in the tie rod passing hole.
[0023] A round nut countersink matching the outer diameter of the round nut 12 is opened at the upper end of the countersink. The diameter of the round nut countersink is larger than the diameter of the countersink. The round nut 12 is placed in the round nut countersink. After the pressure cover 7 is installed, the round nut 12 is pressed tightly in the round nut countersink, thereby fixing the round nut 12.
[0024] The inner ring of the gland 7 and the inner ring of the round nut 12 are both threadedly connected to the positioning sleeve 9. Figure 1 As shown, the upper end of the positioning sleeve 9 is provided with an external thread A10, the inner circle of the pressure cover 7 is provided with an internal thread A8 corresponding to the external thread A10, the positioning sleeve 9 is provided with an external thread B11, the external thread B11 is located below the external thread A10, and the inner circle of the round nut 12 is provided with an internal thread B13 corresponding to the external thread B11.
[0025] The thread rotation directions of the pressure cap 7 and the round nut 12 are opposite, so the rotation directions of the external thread A10 and the external thread B11 are opposite, and the rotation directions of the internal thread A8 and the internal thread B13 are opposite. Therefore, when the pressure cap 7 presses the round nut 12 into the round nut countersunk hole, the positioning sleeve 9 cannot rotate or move up and down.
[0026] The pull rod 1 is threadedly connected with a balancing nut 4 supporting a positioning sleeve 9. The balancing nut 4 is located between the positioning sleeve 9 and the pressing nut 3. A certain gap is left between the balancing nut 4 and the pressing nut 3. An elastic balancing sleeve 6 is installed between the balancing nut 4 and the positioning sleeve 9. The elastic balancing sleeve 6 is an elastic annular sleeve.
[0027] A plurality of anti-rotation protrusions 14 are fixedly connected to the lower end of the positioning sleeve 9. In this embodiment, three anti-rotation protrusions 14 are provided and are evenly distributed along the circumferential direction.
[0028] like Figure 2 , 3 As shown, the balancing nut 4 is provided with a slot A15 for allowing the stop protrusion 14 to pass through, and the upper end of the pressing nut 3 is provided with a slot B16 for allowing the stop protrusion 14 to be inserted into, the width of the slot A15 is the same as the width of the stop protrusion 14, and the width of the slot B16 is the same as the width of the stop protrusion 14.
[0029] The anti-rotation protrusion 14 is arranged on the outer side of the lower end surface of the positioning sleeve 9 , and the elastic balancing sleeve 6 is located on the inner side of the anti-rotation protrusion 14 .
[0030] The method of using the present invention is as follows: when pressing down, the pull rod 1 rotates, and drives the pressing nut 3 to be pressed down through the thread, thereby driving the bearing seat 5 to move downward. The balancing nut 4 is used to support the positioning sleeve 9 and the bearing seat 5 and other structures. A certain gap is maintained between the balancing nut 4 and the pressing nut 3, so that the weight is supported on the balancing nut 4, and the pressing nut is not subjected to force in a static state.
[0031] The pull rod 1 rotates in the opposite direction, and the bearing seat 5 is driven to move upward through the balance nut 4.
[0032] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.
Claims
1. A short stress line rolling mill press-down nut fixing structure, comprising a bearing seat (5), a tie rod (1) passing through the bearing seat (5), and a press-down nut (3) threadedly connected to the tie rod (1), wherein the bearing seat (5) is provided with a countersunk hole adapted to the press-down nut (3), and characterized in that: It also includes a positioning sleeve (9) sleeved on the pull rod (1), the positioning sleeve (9) is located above the press-down nut (3) and is fixedly connected to the bearing seat (5), the pull rod (1) is threadedly connected with a balancing nut (4) supporting the positioning sleeve (9), the balancing nut (4) is located between the positioning sleeve (9) and the press-down nut (3), the lower end of the positioning sleeve (9) is fixedly connected with a plurality of stop protrusions (14), the balancing nut (4) is provided with a slot A (15) for allowing the stop protrusions (14) to pass through, and the upper end of the press-down nut (3) is provided with a stop protrusion (14) is inserted into the slot B (16); it also includes a gland (7) and a round nut (12); the upper end of the countersunk hole is provided with a round nut countersunk hole adapted to the outer diameter of the round nut (12); the gland (7) and the bearing seat (5) are fixedly connected by bolts and the round nut is pressed into the round nut countersunk hole; the inner ring of the gland (7) and the inner ring of the round nut (12) are both threadedly connected to the positioning sleeve (9); the threads of the gland (7) and the round nut (12) are in opposite directions; an elastic balancing sleeve (6) is installed between the balancing nut (4) and the positioning sleeve (9).
2. A short stress line rolling mill press-down nut fixing structure according to claim 1, characterized in that: The gland (7) is provided with a tie rod passing hole, and a sealing ring adapted to the tie rod (1) is installed in the tie rod passing hole.
3. The short stress line rolling mill pressing nut fixing structure according to claim 1 is characterized in that: The anti-rotation protrusions (14) are provided in three numbers and are evenly distributed along the circumferential direction.
4. The short stress line rolling mill pressing nut fixing structure according to claim 1 is characterized in that: The anti-rotation protrusion (14) is arranged on the outer side of the lower end surface of the positioning sleeve (9), and the elastic balancing sleeve (6) is located on the inner side of the anti-rotation protrusion (14).
5. The short stress line rolling mill pressing nut fixing structure according to claim 1, characterized in that: The pull rod (1) is provided with a spherical pad (2) located below the pressing nut (3).