Locking device for anti-backlash worm and gear transmission
Through the combined structure of a continuously variable speed reduction motor and precision locking nut, the problem of reverse clearance in the worm gear and worm transmission device affecting the transmission accuracy is solved, higher accuracy and lower failure rate are achieved, and plate and belt straightening is improved quality.
Patent Information
- Application Number
- CN202420031396.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-07
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-01-07
AI Technical Summary
The existence of reverse gap in the worm gear and worm transmission device affects the transmission accuracy, causing idle thrust slide mechanism, causing errors and position instability of the equipment control system.
The worm gear and worm mechanism is driven by a continuously variable speed reduction motor. Through the combined structure of the spline screw shaft and the gap-extinguishing nut, the combined structure of the main nut and the auxiliary nut and the combined positioning of the thrust ball bearing and the needle roller bearing are realized to achieve precision locking. Tighten, reduce bidirectional clearance and improve accuracy.
It effectively reduces the reverse clearance between the spline screw shaft and the gap-extinguishing nut, improves the accuracy of worm gear and worm movement, ensures the straightening quality of the plate and belt, and reduces the failure rate and maintenance difficulty.
Smart Images
Figure CN222315871U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of metallurgical equipment, in particular to a locking device for high-precision backlash-eliminating worm gear transmission. Background Art
[0002] With the emergence of ultra-thin stainless steel and high-strength steel, the multi-roller straightening mode has been widely promoted. According to the repeated bending theory, the strip is bent repeatedly under the action of alternating stress and tension, which can eliminate the comprehensive defects of the strip during the rolling process at one time. The multi-roller straightening mode can achieve a thickness of 0.02~3.0mm and a yield strength of σ b ≤2000MPa strip processing. The upper roller system pressing mechanism of the multi-roller straightening machine is composed of a worm gear reduction mechanism, an upper slide seat body, an eccentric sway mechanism, etc. The worm gear in the reduction box is connected to the upper slide seat body through a nut and a screw. The lifting and tilting of the upper roller system are controlled by a reduction motor and a magnetostrictive displacement sensor, and the lifting amount and tilt angle of the upper roller system can be accurately adjusted. A set of worm gear anti-backlash mechanism is designed at the head of the screw, which is composed of a thrust bearing and a butterfly spring group. After the backlash is eliminated, the forward and reverse feeding accuracy of the upper roller system pressing mechanism is ≤0.05mm. The pressing mechanism also includes a set of sway mechanism, which controls the sway of the upper slide seat body through a reduction motor and a magnetostrictive displacement sensor to adjust the roller system inclination angle. The sway mechanism can tilt the upper roller system, forming a smaller opening at the inlet end, a larger strip deformation, a larger opening at the outlet end, and a gradually reduced strip deformation, so as to improve the correction quality of the plate and strip. The feeding accuracy of the sway mechanism is ≤0.05mm.
[0003] The accuracy of the worm gear transmission device in the pressing mechanism directly affects the quality of strip straightening. Due to the existence of the worm gear reverse clearance, it will have a certain impact on its transmission accuracy, causing the motor to idle while the thrust slider mechanism does not move when the thrust slider mechanism moves in the reverse direction, resulting in errors in the semi-closed loop system of the equipment control system and unstable position of the full closed loop system. Summary of the invention
[0004] In order to overcome the deficiencies of the prior art, the purpose of the invention of the utility model is to provide a locking device for an anti-backlash worm gear transmission to reduce the clearance of the spline screw shaft and avoid the influence of the reverse clearance between the spline screw shaft and the anti-backlash nut on the movement of the worm gear.
[0005] To achieve the above-mentioned purpose of the invention, the output hole of the continuously variable speed reduction motor of the utility model is connected with the worm key of the worm gear mechanism, and the worm drives the double worm gear group to rotate simultaneously; the spline shaft end at one end of the spline screw shaft is connected with the inner spline hole of the double worm gear group, and the rotation of the double worm gear group drives the spline screw shaft to rotate; the anti-backlash nut is fixed in the positioning frame, the spline screw shaft is threadedly connected with the anti-backlash nut, and the rotation of the spline screw shaft drives the thrust slider mechanism connected to the other end of the spline screw shaft to move, and the anti-backlash nut includes a main nut and a secondary nut, the secondary nut is pressed against the main nut in the reverse direction, and the secondary nut is fixed to the main nut by a positioning pin and a locking screw.
[0006] Furthermore, the double worm gear set is a combined structure in which a tin bronze worm gear is connected to a second mounting seat; a thrust ball bearing is installed between the second mounting seat above the double worm gear set and the spline screw shaft, and the thrust ball bearing is positioned by the pressure cover and the second mounting seat; two rows of needle roller bearings are installed between the outer circle of the tin bronze worm gear below the double worm gear set and the inner hole of the first mounting seat, and the thrust ball bearing combination is installed between the end face of the tin bronze worm gear, the inner hole of the first mounting seat, and the spline screw shaft, and the tin bronze worm gear, the first mounting seat, and the spline screw shaft position the two rows of needle roller bearings and the thrust ball bearing combination.
[0007] Furthermore, the secondary nut is provided with a waist-shaped groove. After the secondary nut adjusts the clamping force on the spline screw shaft, the positioning pin accurately positions the secondary nut and the main nut from the waist-shaped groove, and then the secondary nut and the main nut are fixed by a locking screw.
[0008] Furthermore, the arc-shaped slider of the thrust slider mechanism is mounted on the spline screw shaft through a locking nut, and a copper slider is provided between the arc-shaped slider and the end surface of the spline screw shaft.
[0009] Compared with the prior art, the utility model adopts a stepless speed reduction motor to drive the worm gear mechanism to rotate, thereby driving the spline screw shaft to rotate, so that the spline screw shaft can flexibly move up and down under the control of the anti-backlash precision nut, the spline screw shaft and the thrust slider mechanism are connected by a precision locking nut, so that the thrust slider mechanism can be pressed down and adjusted under the push of the spline screw shaft; the anti-backlash nut adopts a combined structure of a main nut and a secondary nut, with high positioning accuracy, long service life, low failure rate, and the precision nut is convenient to eliminate reverse clearance and adjust, so that the two-way clearance between the nut and the screw is ≤0.01mm, and after the structure is componentized, maintenance is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a simplified structural diagram of the utility model.
[0011] Figure 2 for Figure 1 Schematic diagram of the connection structure between the anti-backlash nut and the spline screw shaft.
[0012] Figure 3 for Figure 1 Schematic diagram of the structure of the secondary nut.
[0013] In the figure: 1. Worm gear mechanism; 2. Stepless speed reduction motor; 3. Thrust ball bearing; 4. Double worm gear set; 5. Tin bronze worm gear; 6. Needle roller bearing; 7. Thrust ball bearing combination; 8. Mounting seat one; 9. Secondary nut; 10. Locating pin; 11. Main nut; 12. Thrust slider mechanism; 13. Locking nut; 14. Copper slider; 15. Arc slider; 16. Worm; 17. Mounting seat two; 18. Spline screw shaft; 19. Positioning frame; 20. Anti-backlash nut; 21. Locking screw; 22. Pressure cover; 23. Waist-shaped groove. DETAILED DESCRIPTION
[0014] like Figure 1 , Figure 2 , Figure 3 As shown, the output hole of the stepless speed reduction motor 2 of the utility model is key-connected with the worm 16 of the worm gear mechanism 1, and the worm 16 drives the double worm gear set 4 to rotate simultaneously; the double worm gear set 4 is a combined structure connected with the tin bronze worm wheel 5 and the second mounting seat 17; a thrust ball bearing 3 is installed between the second mounting seat 17 above the double worm gear set 4 and the spline screw shaft 18, and the thrust ball bearing 3 is positioned by the pressure cover 22 and the second mounting seat 17; two rows of needle roller shafts are installed between the outer circle of the tin bronze worm wheel 5 below the double worm gear set 4 and the inner hole of the first mounting seat 8 The bearing 6 and the thrust ball bearing combination 7 are installed between the end face of the tin bronze worm wheel 5, the inner hole of the mounting seat 8, and the spline screw shaft 18. The tin bronze worm wheel 5, the mounting seat 8, and the spline screw shaft 18 position the two-row needle roller bearings 6 and the thrust ball bearing combination 7; the spline shaft end at one end of the spline screw shaft 18 is connected to the inner spline hole of the double worm wheel group 4. The double worm wheel group 4 rotates, driving the spline screw shaft 18 to rotate flexibly under the action of force, which can effectively ensure the precise positioning of the worm gear mechanism 1 and make the rotation accuracy of the worm gear mechanism 1 ≤0.02mm.
[0015] The anti-backlash nut 20 is fixed in the positioning frame 19, the spline screw shaft 18 is threadedly connected to the anti-backlash nut 20, the arc slider 15 of the thrust slider mechanism 12 is installed on the spline screw shaft 18 through the locking nut 13, and a copper slider 14 is provided between the arc slider 15 and the end face of the spline screw shaft 18. The copper slider 14 can protect the spline screw shaft 18 and the arc slider 15, and is easy to replace and maintain. The locking nut 13 connects and fixes the arc slider 15 to the spline screw shaft 18; the spline screw shaft 18 rotates, pushing the copper slider 14 and the arc slider 15 connected to the other end of the spline screw shaft 18 to move axially, converting the rotational motion of the spline screw shaft 18 into precise axial movement of the thrust slider mechanism 12, so that the arc slider 15 can move smoothly.
[0016] The anti-backlash nut 20 includes a main nut 11 and a secondary nut 9. The main nut 11 is mainly positioned on the spline screw shaft 18, and the secondary nut 9 is pressed against the main nut 11 in the reverse direction. The secondary nut 9 is provided with a waist-shaped groove 23. After the secondary nut 9 adjusts the clamping force on the spline screw shaft 18, the locating pin 10 accurately positions the secondary nut 9 and the main nut 11 from the waist-shaped groove, and then the secondary nut 9 and the main nut 11 are fixed by the locking screw 21, so that the gap between the secondary nut 9 and the spline screw shaft 18 is ≤0.02mm, and the bidirectional gap between the spline screw shaft 18 and the anti-backlash nut 20 is 0.005mm, thereby improving the adjustment accuracy of the pressing mechanism.
Claims
1. A locking device for anti-backlash worm gear transmission, characterized in that: The output hole of the stepless speed reduction motor (2) is key-connected with the worm (16) of the worm gear mechanism (1), and the worm (16) drives the double worm gear set (4) to rotate simultaneously; the spline shaft end of one end of the spline screw shaft (18) is connected with the inner spline hole of the double worm gear set (4), and the rotation of the double worm gear set (4) drives the spline screw shaft (18) to rotate; the anti-backlash nut (20) is fixed in the positioning frame (19), the spline screw shaft (18) is threadedly connected to the anti-backlash nut (20), and the rotation of the spline screw shaft (18) drives the thrust slider mechanism (12) connected to the other end of the spline screw shaft (18) to move, and the anti-backlash nut (20) includes a main nut (11) and a secondary nut (9), the secondary nut (9) is reversely pressed toward the main nut (11), and the secondary nut (9) is fixed to the main nut (11) by a positioning pin (10) and a locking screw (21).
2. The locking device for anti-backlash worm gear transmission according to claim 1, characterized in that: The double worm gear assembly (4) is a combined structure in which a tin bronze worm gear (5) and a second mounting seat (17) are connected together; a thrust ball bearing (3) is installed between the second mounting seat (17) and the spline screw shaft (18) above the double worm gear assembly (4), and the thrust ball bearing (3) is positioned by a pressure cover (22) and the second mounting seat (17); two rows of needle roller bearings (6) are installed between the outer circle of the tin bronze worm gear (5) and the inner hole of the first mounting seat (8) below the double worm gear assembly (4); a thrust ball bearing assembly (7) is installed between the end face of the tin bronze worm gear (5), the inner hole of the first mounting seat (8), and the spline screw shaft (18); the tin bronze worm gear (5), the first mounting seat (8), and the spline screw shaft (18) position the two rows of needle roller bearings (6) and the thrust ball bearing assembly (7).
3. The locking device for anti-backlash worm gear transmission according to claim 1, characterized in that: The secondary nut (9) is provided with a waist-shaped groove (23). After the secondary nut (9) adjusts the pressing force on the spline screw shaft (18), the positioning pin (10) accurately positions the secondary nut (9) and the main nut (11) from the waist-shaped groove, and then the secondary nut (9) and the main nut (11) are fixed by a locking screw (21).
4. The locking device for anti-backlash worm gear transmission according to claim 1, characterized in that: The arc-shaped slider (15) of the thrust slider mechanism (12) is mounted on the spline screw shaft (18) via a locking nut (13), and a copper slider (14) is provided between the end surface of the arc-shaped slider (15) and the spline screw shaft (18).