A nut tightening mechanism for generator pulley assembly

Abstract

The present invention belongs to the technical field of charging generator assembly processes, and specifically relates to a nut tightening mechanism for assembling a generator pulley. A mounting plate is provided on a support rod between a bottom plate and a top plate, with a linear guide rail provided on each side of the mounting plate; a slide is provided on the linear guide rail, and the two slides are connected by a connecting rod; a fixing plate is also provided on the mounting plate for placing a lower pressure cylinder; a fixing seat is provided above the front end of the top plate, on which a servo motor and a reducer are provided; a torque sensor is provided within the fixing seat; the upper end of the torque sensor is connected to the output shaft of the reducer, and the lower end passes through the top plate and is connected to a telescopic universal coupling; the bottom of the telescopic universal coupling is connected to a guide seat via a connecting shaft, and the bottom of the connecting shaft is connected to a nut sleeve; a connecting plate is also provided below the guide seat, and the middle part of the connecting plate is penetrated by the nut sleeve. The present invention can realize locking torque control and detection, and has good market application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of charging generator assembly technology, and particularly relates to a nut tightening mechanism for generator pulley assembly. Background Art

[0002] The existing method for tightening nuts on charging generators involves using an electric or manual wrench to tighten the nuts through impact force, followed by inspection and reinforcement with a torque wrench. While this method is simple to use, it suffers from the problem of uncontrollable tightening torque. Inspection with a torque wrench can only detect insufficient tightening torque, but cannot detect problems such as excessive tightening torque.

[0003] The present invention proposes a nut tightening mechanism for generator pulley assembly, which can realize locking torque control and detection, and can record torque data, equipment status data and production information, automatically monitor the above data, alarm and record, and export them to a computer for statistics and analysis.

[0004] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0005] The object of the present invention is to provide a nut tightening mechanism for assembling a generator pulley, so as to realize the control and detection of the locking torque.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A nut tightening mechanism for assembling a generator pulley, comprising:

[0008] A bottom plate, with a top plate provided above it; a plurality of support rods provided between the top plate and the bottom plate; a mounting plate provided on two of the support rods near the front end of the top plate, with a linear guide rail provided on each side of the mounting plate; a slide seat slidably engaged with the linear guide rail; the two slide seats are connected by a connecting rod;

[0009] A fixing plate is arranged on the mounting plate; a lower pressure cylinder is provided on the fixing plate, and the telescopic end of the lower pressure cylinder passes through the fixing plate and is connected and fixed to the middle part of the connecting rod;

[0010] A fixing seat is provided above the front end of the top plate; a servo motor and a reducer are provided on the fixing seat; the reducer is located below the servo motor and connected to the output shaft of the servo motor;

[0011] A torque sensor is disposed within the fixing seat, with its upper end connected to the output shaft of the reducer, and its lower end passing through the fixing seat bottom plate and the top plate and connected to a telescopic universal coupling; a spring is sleeved on the middle portion of the telescopic universal coupling, and its bottom is connected to a guide seat via a connecting shaft; a guide bearing is provided on each side of the guide seat, and a ball bearing is horizontally mounted in the middle portion; the inner ring of the ball bearing is penetrated by the connecting shaft and fixedly connected to the connecting shaft; a nut sleeve is connected to the bottom of the connecting shaft, and a magnet is installed inside the nut sleeve;

[0012] A connecting plate is arranged below the guide seat; the middle part of the connecting plate is penetrated by the nut sleeve, and its end close to the connecting rod is integrally formed with the connecting rod; a guide column is provided on each side of the connecting plate for sliding and guiding cooperation with the guide bearing at the corresponding position.

[0013] Preferably, both ends of the connecting rod are fixed to the sliding seats at corresponding positions by bolts.

[0014] Preferably, a limit block is provided on the connecting rod, and a limit groove is provided in the middle of the limit block; the lower end of the telescopic end of the downward pressure cylinder is located in the limit groove.

[0015] Preferably, the fixing seat includes two upper and lower load-bearing plates; four support columns are provided between the two load-bearing plates; the load-bearing plate located below is fixed to the top plate by bolts, and the lower end of the torque sensor penetrates the middle thereof.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The generator pulley assembly nut tightening mechanism of the present invention uses a servo motor in conjunction with a reducer to drive the telescopic universal coupling and the nut sleeve to rotate, which can achieve high-torque locking of the nut; a torque sensor is provided between the telescopic universal coupling and the reducer, which can be used to monitor the torque change during the nut tightening process.

[0018] (2) The nut tightening mechanism for assembling the generator pulley of the present invention, the telescopic end of the downward pressure cylinder can drive the connecting rod and the slides on both sides of the connecting rod to move up and down along the linear guide rails at corresponding positions; when the connecting rod moves, it can drive the connecting plate integrally formed with it to move, and then drive the nut sleeve to move to a height that matches the rechargeable generator; the nut sleeve and the connecting plate can slide relative to each other to adapt to rotors of different heights; when the connecting plate moves downward, it will drive the nut sleeve to move downward; when the nut in the nut sleeve contacts the end face of the rotor shaft, the nut sleeve stops moving downward, and at this time the elastic force generated by the spring above the connecting shaft makes the nut close to the rotor shaft, which is conducive to locking the nut into the thread of the rotor shaft.

[0019] (3) The nut tightening mechanism for assembling the generator pulley of the present invention can realize the tightening of the nuts of different models of generators by replacing the tooling, which is highly flexible; the use of a servo motor to realize the automation of nut tightening can not only save labor hours, but also can be used in conjunction with a torque sensor to realize locking torque control and detection, avoiding the problem of uncontrollable torque size when using an electric or manual wrench to tighten the nut through impact force. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is an external schematic diagram of the present invention;

[0021] Figure 2 It is a cross-sectional schematic diagram of the present invention;

[0022] Figure 3 yes Figure 1 Enlarged view of point A in the middle;

[0023] Figure 4 It is a flow chart of the operation of the equipment of the present invention;

[0024] Description of main reference numerals:

[0025] 1. Bottom plate; 2. Top plate; 3. Support rod; 4. Mounting plate; 5. Linear guide; 6. Slide; 7. Connecting rod; 8. Fixed plate; 9. Down-pressure cylinder; 10. Fixed seat; 11. Servo motor; 12. Reducer; 13. Torque sensor; 14. Telescopic universal joint; 15. Guide seat; 16. Nut sleeve; 17. Connecting plate; 18. Limit block; 19. Limit groove; 20. Load-bearing plate; 21. Support column; 22. Rechargeable generator; 23. Spring; 24. Guide bearing; 25. Guide column; 26. Product seat; 27. Connecting shaft; 28. Automatic card rotation module. DETAILED DESCRIPTION

[0026] The following is a clear and complete description of the technical solution of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention.

[0028] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and connections within two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention.

[0029] Referring to the accompanying drawings, a nut tightening mechanism for assembling a generator pulley comprises:

[0030] A bottom plate 1 is provided with a top plate 2 above it; a plurality of support rods 3 are provided between the top plate 2 and the bottom plate 1; a mounting plate 4 is provided on two support rods 3 near the front end of the top plate 2, and a linear guide rail 5 is provided on each side of the mounting plate 4; a slide 6 is provided on the linear guide rail 5 and is slidably engaged with the slide 6; the two slides 6 are connected by a connecting rod 7;

[0031] A fixing plate 8 is provided on the mounting plate 4; a lower pressure cylinder 9 is provided on the fixing plate 8, the telescopic end of the lower pressure cylinder 9 passes through the fixing plate 8 and is connected and fixed to the middle of the connecting rod 7;

[0032] A fixing base 10 is provided above the front end of the top plate 2; a servo motor 11 and a reducer 12 are provided on the fixing base 10; the reducer 12 is located below the servo motor 11 and is connected to the output shaft of the servo motor 11;

[0033] The torque sensor 13 is disposed within the fixed seat 10, with its upper end connected to the output shaft of the reducer 12 and its lower end penetrating the bottom plate 1 and top plate 2 of the fixed seat 10 and connected to a telescopic universal coupling 14. A spring 23 is sleeved in the middle of the telescopic universal coupling 14, and its bottom is connected to a guide seat 15 via a connecting shaft 27. A guide bearing 24 is provided on each side of the guide seat 15, and a ball bearing is horizontally mounted in the middle thereof. The inner ring of the ball bearing is penetrated by the connecting shaft 27 and fixedly connected to the connecting shaft 27. The ball bearing can also elastically deflect radially within the guide seat 15 to offset the axial center deviation that may occur when tightening the nut. The bottom of the connecting shaft 27 is connected to a nut sleeve 16, and a magnet is installed inside the nut sleeve 16 to attract the nut to prevent it from falling.

[0034] The connecting plate 17 is arranged below the guide seat 15; the middle part of the connecting plate 17 is penetrated by the nut sleeve 16, and its end close to the connecting rod 7 is integrally formed with the connecting rod 7; a guide column 25 is provided on each side of the connecting plate 17 for sliding and guiding cooperation with the guide bearing 24 at the corresponding position.

[0035] In this embodiment, the two ends of the connecting rod 7 are respectively fixed to the slide 6 at the corresponding position by bolts. A limit block 18 is provided on the connecting rod 7, and a limit slot 19 is provided in the middle of the limit block 18; the lower end of the telescopic end of the downward-pressing cylinder 9 is located in the limit slot 19. The fixed seat 10 includes two upper and lower load-bearing plates 20; four support columns 21 are provided between the two load-bearing plates 20; the load-bearing plate 20 located at the bottom is fixed to the top plate 2 by bolts, and the middle part is penetrated by the lower end of the torque sensor 13. It should be noted that when the telescopic end of the downward-pressing cylinder 9 extends downward, it drives the connecting plate 17 to move downward; at this time, the downward movement of the guide seat 15 and the nut sleeve 16 is due to the elastic force generated by the compression of the spring 23; when the telescopic end of the downward-pressing cylinder 9 moves upward, the connecting plate 17 drives the guide seat 15 to move upward, and the spring 23 is compressed again.

[0036] Working principle: The nut tightening mechanism for assembling the generator pulley of the present invention can realize locking torque control and detection, and control the equipment operation through a controller connected to an electrical control cabinet to realize servo tightening nut automation; the assembled rechargeable generator 22 waiting for nut tightening is placed on the product seat 26. Before use, the nut tightening mechanism of the present invention needs to be initialized and self-checked, and then the servo motor 11 is controlled by the non-standard independently designed control system built into the electrical control cabinet to tighten the nut in three stages with the set torque: in the first stage of assembly, the nut rotates at a speed of 25r / min and is coaxially aligned with the shaft, and the control system simultaneously detects and calculates whether the nut is obliquely locked; in the second stage of pre-locking, the nut is quickly locked at a speed of 100r / min; in the third stage of tightening, the nut is locked to the set torque at a speed of 25r / min, and at the same time detects whether there is any slipping; the torque sensor 13 collects data during the nut tightening process, and feeds back the torque to the control system in real time for PID calculation until the detected torque reaches the set value and the tightening is completed.

[0037] Furthermore, the generator pulley assembly nut tightening mechanism of the present invention can be configured to adjust the number of nut tightening cycles and time intervals, as well as monitor the rotation of the nut sleeve after tightening, to facilitate separation of the nut sleeve 16 from the nut. The generator pulley assembly nut tightening mechanism of the present invention also includes an automatic locking module 28 mounted on the base plate 1 at the rear. As a specialized module for internally bladed generators, its front end automatically radially engages with the grooves on the circumferential surface of the rotor claw poles during operation.

[0038] The nut tightening mechanism for assembling the generator pulley of the present invention can achieve a maximum locking torque of 250 N.m by the servo motor 11, and the torque error is controlled within 7%. The nut tightening mechanism for assembling the generator pulley of the present invention can automatically detect oblique locking and slipping and alarm. When the nut is tightened to the standard, qualified information is fed back; when it is detected that the nut is tightened unqualified, the press-fitting is stopped and an audible and visual alarm is triggered. It should be noted that oblique locking and slipping are both judged by monitoring and implementing torque calculations; if oblique locking occurs, the servo motor 11 will stop rotating, and the downward pressure cylinder 9 will not reset; if slipping occurs, the servo motor 11 will continue to run, and the downward pressure cylinder 9 will not reset. For the above two abnormal situations, corresponding alarm information will be displayed on the display screen of the controller.

[0039] The nut tightening mechanism for assembling the generator pulley of the present invention also has a remote data uploading function. By making corresponding programs and reserving interfaces in the control system independently designed in the electric control cabinet, data can be exchanged with the remote computer in real time through the network, thereby facilitating automatic remote data uploading, remote monitoring and control; the tightening data and bearing pressing force are automatically recorded and summarized for analysis, and quality control can be easily achieved.

[0040] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A nut tightening mechanism for assembling a generator pulley, characterized in that: include: A bottom plate, with a top plate provided above it; a plurality of support rods provided between the top plate and the bottom plate; a mounting plate provided on two of the support rods near the front end of the top plate, with a linear guide rail provided on each side of the mounting plate; a slide seat slidably engaged with the linear guide rail; the two slide seats are connected by a connecting rod; A fixing plate is arranged on the mounting plate; a lower pressure cylinder is provided on the fixing plate, and the telescopic end of the lower pressure cylinder passes through the fixing plate and is connected and fixed to the middle part of the connecting rod; A fixing seat is provided above the front end of the top plate; a servo motor and a reducer are provided on the fixing seat; the reducer is located below the servo motor and connected to the output shaft of the servo motor; A torque sensor is disposed within the fixing seat, with its upper end connected to the output shaft of the reducer, and its lower end passing through the fixing seat bottom plate and the top plate and connected to a telescopic universal coupling; a spring is sleeved on the middle portion of the telescopic universal coupling, and its bottom is connected to a guide seat via a connecting shaft; a guide bearing is provided on each side of the guide seat, and a ball bearing is horizontally mounted in the middle portion; the inner ring of the ball bearing is penetrated by the connecting shaft and fixedly connected to the connecting shaft; a nut sleeve is connected to the bottom of the connecting shaft, and a magnet is installed inside the nut sleeve; A connecting plate is arranged below the guide seat; the middle part of the connecting plate is penetrated by the nut sleeve, and its end close to the connecting rod is integrally formed with the connecting rod; a guide column is provided on each side of the connecting plate for sliding and guiding cooperation with the guide bearing at the corresponding position.

2. The nut tightening mechanism for assembling a generator pulley according to claim 1, characterized in that: Both ends of the connecting rod are fixed to the sliding seats at corresponding positions by bolts.

3. The nut tightening mechanism for assembling a generator pulley according to claim 1, characterized in that: The connecting rod is provided with a limit block, and a limit slot is provided in the middle of the limit block; the lower end of the telescopic end of the downward pressure cylinder is located in the limit slot.

4. The nut tightening mechanism for assembling a generator pulley according to claim 1, characterized in that: The fixing seat includes two upper and lower load-bearing plates; four support columns are provided between the two load-bearing plates; the load-bearing plate located at the bottom is fixed to the top plate by bolts, and the lower end of the torque sensor penetrates the middle thereof.

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