Round nut assembly type commutator drying, pressing and tightening device

Abstract

The invention discloses a round nut assembly type commutator drying, pressing and tightening device which comprises a pressing ring, a drive plate, a handle, a ring, a gasket, a shell, a mandrel, a large spring, a ratchet wheel, a pawl and a small spring. The ring is assembled in an inner hole of the shell and is connected with the shell; one end of the shell extends into an inner hole of the pressing ring and is connected with the pressing ring. The mandrel is assembled in the inner holes of the ring and the shell, and the two ends of the mandrel are limited through the drive plate and the gasket respectively. And a large spring is sleeved on the shaft body of the core shaft. The ratchet wheel is located in the kidney-shaped groove in the shell, and the inner wall of the ratchet wheel faces the square through hole in the mandrel. A mounting clamping groove is formed in the ratchet wheel and used for assembling the handle, so that the ratchet wheel is driven to rotate synchronously. Two pawls and a small spring connected with the two pawls are assembled in the square through hole, and self-locking of the round nut within a certain range is achieved through mutual matching of the pawls and the ratchet wheel. According to the invention, an assembly type structure is adopted, commutator of various specifications can be adapted through modular combination, and only corresponding modules need to be replaced when local damage occurs.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of baking and pressing molds, and particularly relates to a round nut assembly type commutator baking and pressing and tightening device. BACKGROUND

[0002] As a core component of direct current motors and general-purpose motors, the manufacturing precision of the commutator directly affects the performance and service life of the motor. In the assembly type commutator, the baking and pressing forming is a key process of the forming quality of the commutator. Through several times of baking and pressing, the mica ring is further stabilized, and at the same time, a certain interlamination pressure is formed between the commutator segment and the mica sheet, which ensures the combination of metal and wood and forms a stable insulation structure.

[0003] The traditional baking and pressing mold is of an integrated design. Different models of commutators need to be designed with separate molds, which leads to long development cycle, high cost, poor adaptability and other problems, and it is difficult to meet the needs of multi-model, small-batch and customized production. At the same time, the integrated mold needs to be rust-proofed or replaced as a whole after local wear, which causes serious waste of resources. In addition, the traditional baking and pressing mold is time-consuming in assembly, disassembly and cleaning during use, which affects the production efficiency and easily causes heat loss of the commutator, resulting in uneven temperature of the commutator and affecting the quality of the finished product. With the rapid development of new energy vehicles, intelligent home appliances and other industries, the market has increasingly high requirements for the diversification and high precision of the commutator, and there is an urgent need for an efficient, flexible and quickly adaptable baking and pressing technology for different specifications. SUMMARY

[0004] The purpose of the present application is to provide a round nut assembly type commutator baking and pressing and tightening device, which comprises a pressing ring, a dial, a handle, a ring, a gasket, a shell, a mandrel, a large spring, a ratchet wheel, a pawl and a small spring.

[0005] The pressing ring, the shell and the ring are all hollow rotary body structures. One end of the shell extends into the inner hole of the pressing ring and is fixedly connected with the pressing ring through a screw I. The ring is assembled in the inner hole of the shell and is fixedly connected with the shell through a screw II.

[0006] The mandrel is assembled in the inner holes of the ring and the shell, and one end is limited by the dial and the other end is limited by the gasket and the screw III.

[0007] One end of the mandrel facing the dial is provided with a convex rib, and the other end facing the gasket is provided with a strip-shaped groove, and a blind hole is arranged at the center of the end face.

[0008] The dial is a rotary body structure and is clamped in the inner hole of the pressing ring, and a limiting groove is arranged on the end face facing the mandrel. The dial and the mandrel are synchronously rotated through the cooperation of the limiting groove and the convex rib. A plurality of installation clamping teeth are arranged on the end face of the dial away from the mandrel in a circumferential direction. During work, the installation clamping teeth are embedded in the clamping grooves on the round nut.

[0009] The gasket is overlapped on the mandrel and is fixedly connected with the mandrel by the screw III, and a convex rib is arranged on the end face of the gasket facing the mandrel, and the gasket is synchronously rotated with the mandrel through the cooperation of the convex rib and the strip-shaped groove.

[0010] A large spring is sleeved on the shaft of the mandrel, and the two ends of the large spring are respectively abutted against the step face of the inner hole of the shell and the end face of the dial plate.

[0011] Two waist-shaped grooves are symmetrically arranged on the middle side wall of the shell.

[0012] A square through hole is radially arranged on the shaft of the mandrel close to the gasket. A ratchet wheel is assembled between the outer wall of the mandrel and the inner hole of the shell. The ratchet wheel is located in the waist-shaped groove, and the inner wall faces the square through hole. An installation clamping groove is arranged on the ratchet wheel, and the handle is assembled in the installation clamping groove to synchronously rotate the ratchet wheel.

[0013] Two pawls and a small spring connecting the two pawls are assembled in the square through hole, and the pawls and the ratchet wheel are cooperated to realize the self-locking of the round nut within a certain range.

[0014] Further, when the pawl contacts one of the teeth of the ratchet wheel, and the handle drives the ratchet wheel to rotate clockwise, the pawl synchronously rotates with the ratchet wheel due to the engagement of the pawl and the ratchet wheel.

[0015] When the pawl contacts one of the teeth of the ratchet wheel, and the handle drives the ratchet wheel to rotate counterclockwise, the pawl moves radially inward, and at this time, the small spring is in a compressed state, and until the ratchet wheel rotates to the next tooth, the small spring is stretched.

[0016] Further, 8 teeth are evenly distributed in the inner circle of the ratchet wheel, and the adjacent tooth tips are spaced apart by 45°. When the ratchet wheel engages with the ratchet wheel, and the ratchet wheel rotates clockwise by 45°, the pawl can synchronously rotate with the ratchet wheel. When the ratchet wheel engages with the ratchet wheel, and the ratchet wheel rotates counterclockwise by 45°, the pawl can be matched with the next tooth of the ratchet wheel.

[0017] Further, the height of the ratchet wheel is greater than the height of the pawl.

[0018] When working, as the tightening degree of the round nut is different, the mandrel drives the pawl to move up and down, and the moving range of the pawl is kept within the height range of the ratchet wheel.

[0019] Further, the diameter of the gasket is greater than the diameter of the mandrel, so that when the mandrel moves up and down, the movement of the mandrel is limited through the cooperation of the gasket and the ring.

[0020] Further, the inner hole of the pressing ring is a stepped hole, which includes a large-diameter circular hole segment and a small-diameter circular hole segment arranged coaxially, and a circular truncated cone segment connecting the large-diameter circular hole segment and the small-diameter circular hole segment.

[0021] The flange of the dial is provided with an inclined surface on the side end face away from the shaft, the dial is overlapped on the hole wall of the circular cone hole segment of the pressing ring through the inclined surface, and the movement of the shaft is limited through the cooperation between the inclined surface of the dial and the circular cone segment of the pressing ring when the shaft moves up and down.

[0022] Further, during assembly, the mounting clamping groove on the ratchet wheel is aligned with the waist-shaped slot of the shell, the handle is passed through the waist-shaped slot and assembled in the mounting clamping groove.

[0023] Further, the shape of the inner hole of the shell is matched with the outer contour shape of the dial, the ring and the shaft respectively.

[0024] Further, a plurality of threaded holes I are provided on the side wall of the pressing ring at intervals.

[0025] A plurality of threaded blind holes I are provided on the one end of the shell extending into the inner hole of the pressing ring at intervals, and the screws I pass through the threaded holes I and the threaded blind holes I to fix the shell in the pressing ring.

[0026] A plurality of threaded holes II are provided on the side wall of the other end of the shell at intervals.

[0027] A plurality of threaded blind holes II are provided on the side wall of the ring at intervals, and the screws II pass through the threaded holes II and the threaded blind holes II to fix the ring in the shell.

[0028] The technical effect of the present application is self-evident, and the beneficial effects of the present application are as follows:

[0029] The present application adopts an assembled structure, which can adapt to various specifications of commutators through modular combination, significantly reducing development cost; when a part is damaged, only the corresponding module needs to be replaced, without the need for overall scrapping, saving maintenance cost; the device is provided with a self-locking mechanism for anti-loosening, different clamping structures are adopted by replacing the corresponding modules, which can completely match the round nut, prevent slipping, make the drying, pressing and tightening more efficient; finally, the device is simple to use, only the corresponding structure of the device needs to be aligned with the clamping groove of the commutator round nut, and the assembly can be completed, and then the drying, pressing and tightening device and the commutator are pressed at the same time by using a pressing machine, so that the tightening can be performed. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a schematic view of the drying, pressing and tightening device;

[0031] Figure 2 It is an assembly schematic view of the handle, ratchet wheel, pawl, small spring and shaft;

[0032] Figure 3 It is a schematic view of the round nut assembled commutator;

[0033] Figure 4 It is a schematic view of the round nut structure, wherein (a) is an elevation view, and (b) is a plan view;

[0034] Figure 5 is a schematic view of the housing;

[0035] Figure 6 is a schematic view of the dial, wherein (a) is a top view and (b) is a sectional view;

[0036] Figure 7 is a schematic view of the pawl, wherein (a) is a sectional view and (b) is a top view;

[0037] Figure 8 is a schematic view of the ratchet, wherein (a) is a front view and (b) is a top view

[0038] Figure 9 is a schematic view of the working principle of the baking and tightening device.

[0039] In the figure: the pressing ring 1, the dial 2, the limiting groove 201, the mounting clamping tooth 202, the flange 203, the screw I 3, the handle 4, the screw II 5, the ring 6, the washer 7, the screw III 8, the housing 9, the waist-shaped groove 901, the mandrel 10, the convex rib 1001, the blind hole 1002, the square through hole 1003, the large spring 11, the ratchet 12, the mounting clamping groove 1201, the pawl 13, the small spring 14, the round nut 15, the clamping groove 1501, the mica sheet 16, the insulating cylinder 17, the steel sleeve 18, the pressing ring 19, the insulating coating 20. DETAILED DESCRIPTION

[0040] The application will be further described below in conjunction with the examples, but should not be understood as limiting the above-mentioned subject matter of the application to the following examples. According to the ordinary technical knowledge and common practice in the art, various substitutions and modifications can be made without departing from the above-mentioned technical idea of the application, and all of them should be included in the protection scope of the application.

[0041] Example 1

[0042] A round nut assembly type commutator baking and tightening device comprises a pressing ring 1, a dial 2, a handle 4, a ring 6, a washer 7, a housing 9, a mandrel 10, a large spring 11, a ratchet 12, a pawl 13 and a small spring 14.

[0043] The pressing ring 1, the housing 9 and the ring 6 are all hollow rotary body structures. One end of the housing 9 extends into the inner hole of the pressing ring 1 and is fixedly connected with the pressing ring 1 through the screw I 3. The ring 6 is assembled in the inner hole of the housing 9 and is fixedly connected with the housing 9 through the screw II 5.

[0044] The mandrel 10 is assembled in the inner holes of the ring 6 and the housing 9, and one end is limited by the dial 2 and the other end is limited by the washer 7 and the screw III 8.

[0045] The end of the mandrel 10 facing the dial 2 is provided with a ridge 1001, the end facing the washer 7 is provided with a strip-shaped groove, and the center of the end face is provided with a blind hole 1002.

[0046] The dial 2 is a rotary body structure, is clamped in the inner hole of the pressing ring 1, and is provided with a limiting groove 201 on the end face facing the mandrel 10. The dial 2 and the mandrel 10 are synchronously rotated through the cooperation of the limiting groove 201 and the ridge. A plurality of installation clamping teeth 202 are provided on the end face of the dial 2 away from the mandrel 10 and are spaced apart in the circumferential direction. During work, the installation clamping teeth 202 are embedded in the clamping groove 1501 on the circular nut 15.

[0047] The washer 7 is lapped on the mandrel 10 and is fixedly connected with the mandrel 10 through the screw III 8. The end face of the washer 7 facing the mandrel 10 is provided with a ridge. The washer 7 and the mandrel 10 are synchronously rotated through the cooperation of the ridge and the strip-shaped groove.

[0048] The mandrel 10 is sleeved with a large spring 11 on the shaft body. The two ends of the large spring 11 are respectively abutted against the stepped surface of the inner hole of the shell 9 and the end face of the dial 2.

[0049] Two waist-shaped grooves 901 are symmetrically provided on the middle part of the side wall of the shell 9.

[0050] A square-shaped through hole 1003 is radially provided on the shaft body of the mandrel 10 close to the side of the washer 7. A ratchet wheel 12 is assembled between the outer wall of the mandrel 10 and the inner hole of the shell 9. The ratchet wheel 12 is located in the waist-shaped groove 901, and the inner wall faces the square-shaped through hole 1003. The ratchet wheel 12 is provided with an installation clamping groove 1201. The handle 4 is assembled in the installation clamping groove 1201 and drives the ratchet wheel 12 to synchronously rotate.

[0051] Two pawls 13 and a small spring 14 connecting the two pawls 13 are assembled in the square-shaped through hole 1003. The pawl 13 and the ratchet wheel 12 are mutually cooperated to realize the self-locking of the circular nut in a certain range.

[0052] Embodiment 2:

[0053] The main structure of the present embodiment is the same as that of embodiment 1. Further, when the pawl 13 contacts a certain tooth in the ratchet wheel 12 and the handle 4 drives the ratchet wheel 12 to rotate clockwise, the pawl 13 and the ratchet wheel 12 are engaged, and the pawl 13 synchronously rotates with the ratchet wheel 12.

[0054] When the pawl 13 contacts a certain tooth in the ratchet wheel 12 and the handle 4 drives the ratchet wheel 12 to rotate counterclockwise, the pawl 13 moves radially inward. At this time, the small spring 14 is in a compressed state, and until the ratchet wheel 12 rotates to the next tooth, the small spring 14 is stretched.

[0055] Embodiment 3:

[0056] The main structure of the embodiment is the same as any one of embodiments 1-2, further, 8 teeth are evenly distributed in the inner circle of the ratchet wheel 12, and the adjacent tooth tips are spaced 45° apart; when the ratchet wheel 12 is engaged with the ratchet wheel 12, and the ratchet wheel 12 rotates 45° clockwise, the pawl 13 can rotate synchronously with the ratchet wheel 12; when the ratchet wheel 12 is engaged with the ratchet wheel 12, and the ratchet wheel 12 rotates 45° counterclockwise, the pawl 13 can cooperate with the next tooth of the ratchet wheel 12.

[0057] Embodiment 4:

[0058] The main structure of the embodiment is the same as any one of embodiments 1-3, further, the height of the ratchet wheel 12 is greater than the height of the pawl 13.

[0059] During operation, with different tightening degrees of the circular nut 15, the mandrel 10 drives the pawl 13 to move up and down, and the moving range of the pawl 13 is kept within the height range of the ratchet wheel 12.

[0060] Embodiment 5:

[0061] The main structure of the embodiment is the same as any one of embodiments 1-4, further, the diameter of the gasket 7 is greater than the diameter of the mandrel 10, so as to limit the movement of the mandrel 10 through the cooperation of the gasket 7 and the ring 6 when the mandrel 10 moves up and down.

[0062] Embodiment 6:

[0063] The main structure of the embodiment is the same as any one of embodiments 1-5, further, the inner hole of the pressing ring 1 is a stepped hole, which includes a large-diameter circular hole segment and a small-diameter circular hole segment arranged coaxially, and a circular truncated cone segment connecting the large-diameter circular hole segment and the small-diameter circular hole segment.

[0064] The flange 203 is arranged on the dial 2, the side end surface of the flange 203 away from the mandrel 10 is a bevel, the dial 2 is lapped on the hole wall of the circular truncated cone segment of the pressing ring 1 through the bevel, and the movement of the mandrel 10 is limited through the cooperation of the bevel of the dial 2 and the circular truncated cone segment of the pressing ring 1 when the mandrel 10 moves up and down.

[0065] Embodiment 7:

[0066] The main structure of the embodiment is the same as any one of embodiments 1-6, further, during assembly, the mounting clamping groove on the ratchet wheel 12 is aligned with the waist-shaped groove 901 of the shell 9, so that the handle 4 passes through the waist-shaped groove 901 and is assembled in the mounting clamping groove 1201.

[0067] Embodiment 8:

[0068] The main structure of this embodiment is the same as any one of embodiments 1-7, further, the shape of the hole in the shell 9 is adapted to the outer contour shape of the dial 2, ring 6 and mandrel 10 respectively.

[0069] Embodiment 9:

[0070] The main structure of this embodiment is the same as any one of embodiments 1-8, further, a plurality of threaded holes I are provided on the side wall of the pressure ring 1 at intervals.

[0071] A plurality of threaded blind holes I are provided at intervals on the end of the shell 9 extending into the hole of the pressure ring 1, and the screw I 3 passes through the threaded hole I and the threaded blind hole I to fix the shell 9 in the pressure ring 1.

[0072] A plurality of threaded holes II are provided at intervals on the side wall of the other end of the shell 9.

[0073] A plurality of threaded blind holes II are provided at intervals on the side wall of the ring 6, and the screw II 5 passes through the threaded hole II and the threaded blind hole II to fix the ring 6 in the shell 9.

[0074] Embodiment 10:

[0075] The main structure of this embodiment is the same as any one of embodiments 1-9, further, the present patent discloses a drying, pressing and tightening device for commutator with round nut assembly, which is suitable for drying, pressing and tightening of the commutator with round nut assembly. The device comprises a pressure ring 1, a dial 2, a screw I 3, a handle 4, a screw II 5, a ring 6, a washer 7, a screw 8, a shell 9, a mandrel 10, a large spring 11, a ratchet wheel 12, a pawl 13 and a small spring 14.

[0076] The drying, pressing and tightening device is as follows:

[0077] The outer circle of the pressure ring 1 is provided with three evenly distributed clamping grooves, and the shell 9 is provided with three threaded blind holes for mounting three screws I 3. The pressure ring 1 and the shell 9 are connected and fixed by the clamping grooves and the screws I 3. By replacing pressure rings 1 of different sizes, the device can press different sizes of commutators; the outer circle of the middle part of the shell 9 is also provided with three evenly distributed threaded holes, and the ring 6 is fixed by the screws II; along the circumferential surface, the shell 9 is also provided with two symmetrical waist-shaped grooves for the moving window and the observation window of the handle 4.

[0078] Inside the shell 9, the washer 7, the screw 8, the mandrel 10, the large spring 11 and the dial 2 form an axial movement mechanism of the drying, pressing and tightening device.

[0079] The mandrel 10 has a strip-shaped groove and a raised ridge at both ends. The washer 7 has a raised ridge that matches the groove of the mandrel 10, which can prevent the two parts from rotating relative to each other. The two parts are fastened together by screws 8 and assembled on the flange of the ring 6. The upper end of the dial 2 also has a groove that matches the raised ridge of the mandrel 10, which can be assembled with the mandrel. When the mandrel 10 rotates, it can drive the dial 2 to rotate together. At the same time, a blind hole is also machined for venting and releasing pressure during heat pressing and tightening.

[0080] The lower end of the dial 2 is machined with mounting teeth that match the commutator round nut. By changing the dial 2, various commutator round nuts can be matched to complete the heating and tightening action.

[0081] In addition, a radial square through hole is provided in the middle section of the spindle 10 for mounting the pawl 13 and the small spring 14. Since it is connected by the small spring 14, the pawl 13 retracts inward under the condition of force at both ends, and returns to its original shape by the spring force after the force is removed.

[0082] A ratchet 12 is fitted around the outer circumference of the spindle 10. The inner circumference of the ratchet 12 has eight teeth evenly distributed. For every 45-degree clockwise rotation of the ratchet 12, the pawl 13 rotates 45 degrees accordingly. Simultaneously, within this 45-degree range, if the ratchet rotates counter-clockwise, the pawl 13 remains stationary, achieving self-locking of the round nut within a 45-degree range. When the rotation exceeds 45 degrees, the pawl 13 pops out and engages with the next tooth of the ratchet 12. The height of the ratchet 12 is greater than the height of the pawl 13. During use, depending on the tightness of the round nut, the spindle drives the pawl to slide up and down within a certain range, always remaining within the height range of the ratchet. A threaded hole is provided on the outer circumference of the ratchet 12 for mounting the handwheel 4.

[0083] Working principle:

[0084] ① Select pressure ring 1 and dial 2 that match the size of the commutator and the round nut, and install them on the baking and tightening device. Place the baked assembled commutator on the press table while it is still hot with the round nut facing upwards, and install the baking and tightening device on the commutator. Insert the calipers on the dial into the groove of the round nut.

[0085] ② Set a certain pressure and use a press to press and hold the drying and tightening device and the commutator together.

[0086] ③ For example Figure 2 As shown, the initial positions of ratchet 12 and pawl 13 are both 0°. The inner teeth of the ratchet at this position are marked as tooth 1, and in the clockwise direction, they are marked as teeth 2 to teeth 8. At this time, pawl 13 is stuck by tooth 1 of ratchet 12.

[0087] The handle 4 is rotated clockwise, the ratchet wheel 12 is rotated clockwise, the pawl 13 is rotated clockwise with the ratchet wheel 12, the mandrel 10, the dial 2 and the commutator nut are rotated clockwise with the pawl 13, and the rotating angle of them is equal to the rotating angle of the handle, so the commutator nut is tightened by 45° clockwise.

[0088] When the rotating angle is greater than 45°, the handle 4 is rotated counterclockwise, the ratchet wheel 12 is rotated counterclockwise, the pawl 13, the mandrel 10, the dial 2 and the commutator nut are not rotated, and the rotating angle of them is maintained at the present angle; with the ratchet wheel rotating counterclockwise, the moving diameter of the pawl top of the pawl 13 is reduced, the pawl 13 is contracted inward along the center line of the square hole of the mandrel 10, when the counterclockwise rotating angle is greater than 45°, the tooth 2 of the ratchet wheel 12 reaches the position of the pawl 13, the moving diameter of the pawl top of the pawl 13 is suddenly increased, the pawl 13 is reset and popped out under the action of the small spring 14, the pawl 13 is clamped by the tooth 2 of the ratchet wheel 12, the pawl 13 is changed from cooperating with the tooth 1 of the ratchet wheel 12 to cooperating with the tooth 2, and the preparation for the next clockwise rotation of the ratchet wheel-pawl-commutator nut is completed.

[0089] The above movement is repeated continuously, the pawl 13 can be rotated to the tooth 3, the tooth 4, …, the tooth 8, the tooth 1, …, in turn, the rotation of the commutator nut is 1 turn, 2 turns, …, until tightening. The position relationship between the ratchet wheel 12, the pawl 13 and the tooth is shown in the following table:

[0090] Position Start Forward Reverse Reverse Forward Forward Reverse Reverse Forward Ratchet 0° 45° 0° 315° 0° 45° 0° 315° 0° Pawl 0° 45° 45° 45° 90° 135° 135° 135° 180° Engaging teeth Tooth 1 Tooth 1 Tooth 2 Tooth 3 Tooth 3 Tooth 3 Tooth 4 Tooth 5 Tooth 5

[0091] Position Forward Reverse Reverse Forward Forward Reverse Reverse Forward ... Ratchet 45° 0° 315° 0° 45° 0° 315° 0° ... Pawl 225° 225° 225° 270° 315° 315° 315° 0° ... Engaging teeth Tooth 5 Tooth 6 Tooth 7 Tooth 8 Tooth 8 Tooth 1 Tooth 2 Tooth 2 ...

[0092] After the commutator nut is tightened, the pressure of the press is removed, the upper press plate of the press is loosened, the drying and pressing tightening device and the commutator are taken out in turn, and the commutator is tightened once.

Claims

1. A round nut assembly commutator baking and tightening device, characterized in that: It comprises a pressing ring (1), a dial (2), a handle (4), a ring (6), a washer (7), a shell (9), a mandrel (10), a large spring (11), a ratchet wheel (12), a pawl (13) and a small spring (14); The pressing ring (1), the shell (9) and the ring (6) are all hollow rotary body structures; one end of the shell (9) extends into the inner hole of the pressing ring (1) and is fixedly connected with the pressing ring (1) through a screw I (3); the ring (6) is assembled in the inner hole of the shell (9) and is fixedly connected with the shell (9) through a screw II (5); The mandrel (10) is assembled in the inner holes of the ring (6) and the shell (9) and is limited by the dial (2) at one end and by the washer (7) and the screw III (8) at the other end; One end of the mandrel (10) facing the dial (2) is provided with a convex rib (1001) and the other end facing the washer (7) is provided with a strip-shaped groove, and the center of the end face is provided with a blind hole (1002); The dial (2) is a rotary body structure and is clamped in the inner hole of the pressing ring (1), and the end face facing the mandrel (10) is provided with a limiting groove (201), the dial (2) and the mandrel (10) are synchronously rotated through the cooperation of the limiting groove (201) and the convex rib, a plurality of installation clamping teeth (202) are symmetrically arranged on the end face of the dial (2) away from the mandrel (10) in the circumferential direction, and the installation clamping teeth (202) are embedded in the clamping grooves (1501) on the circular nut (15) during work; The washer (7) is lapped on the mandrel (10) and is fixedly connected with the mandrel (10) through the screw III (8), and the end face of the washer (7) facing the mandrel (10) is provided with a convex rib, and the washer (7) and the mandrel (10) are synchronously rotated through the cooperation of the convex rib and the strip-shaped groove; The large spring (11) is sleeved on the shaft of the mandrel (10), and the two ends of the large spring (11) are respectively abutted against the stepped surface of the inner hole of the shell (9) and the end face of the dial (2); Two waist-shaped grooves (901) are symmetrically arranged on the side wall of the middle part of the shell (9); A square through hole (1003) is radially arranged on the shaft of the mandrel (10) near the side of the washer (7); the ratchet wheel (12) is assembled between the outer wall of the mandrel (10) and the inner hole of the shell (9); the ratchet wheel (12) is located in the waist-shaped groove (901) and the inner wall faces the square through hole (1003); the ratchet wheel (12) is provided with an installation clamping groove (1201), and the handle (4) is assembled in the installation clamping groove to synchronously rotate the ratchet wheel (12); Two pawls (13) and a small spring (14) connecting the two pawls (13) are assembled in the square through hole (1003), and the pawl (13) and the ratchet wheel (12) are cooperated to realize the self-locking of the circular nut in a certain range.

2. A round nut assembly type commutator baking and tightening device according to claim 1, characterized in that: When the pawl (13) contacts with one of the teeth in the ratchet wheel (12) and the handle (4) drives the ratchet wheel (12) to rotate clockwise, the pawl (13) is synchronously rotated with the ratchet wheel (12) due to the engagement of the pawl (13) and the ratchet wheel (12). When the pawl (13) is in contact with one of the teeth of the ratchet wheel (12) and the handle (4) drives the ratchet wheel (12) to rotate counterclockwise, the pawl (13) moves radially inward, at this time the small spring (14) is in a compressed state, until the ratchet wheel (12) turns to the next tooth, the small spring (14) is stretched.

3. A round nut assembly type commutator baking and tightening device according to claim 1 or 2, characterized in that: The inner circle of the ratchet wheel (12) is provided with 8 teeth on average, and the adjacent tooth tips are spaced apart by 45°; when the ratchet wheel (12) is engaged with the ratchet wheel (12) and the ratchet wheel (12) rotates clockwise by 45°, the pawl (13) can rotate synchronously with the ratchet wheel (12); when the ratchet wheel (12) is engaged with the ratchet wheel (12) and the ratchet wheel (12) rotates counterclockwise by 45°, the pawl (13) can be engaged with the next tooth of the ratchet wheel (12).

4. A round nut assembly type commutator baking and tightening device according to claim 1, characterized in that: The height of the ratchet wheel (12) is greater than the height of the pawl (13); During operation, as the tightening degree of the circular nut (15) is different, the mandrel (10) drives the pawl (13) to move up and down, and the movement range of the pawl (13) is kept within the height range of the ratchet wheel (12).

5. A round nut assembly type commutator baking and tightening device according to claim 1, characterized in that: The diameter of the gasket (7) is greater than the diameter of the mandrel (10), which is used to limit the movement of the mandrel (10) when the mandrel (10) moves up and down through the cooperation of the gasket (7) and the ring (6).

6. A round nut assembly type commutator baking and tightening device according to claim 1, characterized in that: The inner hole of the pressing ring (1) is a stepped hole, which includes a large-diameter circular hole segment and a small-diameter circular hole segment arranged coaxially, and a circular truncated cone segment connecting the large-diameter circular hole segment and the small-diameter circular hole segment; The flange (203) is provided on the dial (2), and the side end surface of the flange (203) away from the mandrel (10) is a bevel. The dial (2) is lapped on the hole wall of the circular truncated cone segment of the pressing ring (1) through the bevel, and the movement of the mandrel (10) is limited through the cooperation of the bevel of the dial (2) and the circular truncated cone segment of the pressing ring (1) when the mandrel (10) moves up and down.

7. A round nut assembly type commutator baking and tightening device according to claim 1, characterized in that: During assembly, the mounting clamping groove on the ratchet wheel (12) is aligned with the waist-shaped groove (901) of the shell (9), so that the handle (4) passes through the waist-shaped groove (901) and is assembled in the mounting clamping groove (1201).

8. A round nut assembly type commutator baking and tightening device according to claim 1, characterized in that: The shape of the inner hole of the shell (9) is matched with the outer contour shape of the dial (2), the ring (6) and the mandrel (10) respectively.

9. A round nut assembly type commutator baking and tightening device according to claim 1, characterized in that: A plurality of threaded holes I are spaced apart on the side wall of the pressing ring (1); A plurality of threaded blind holes I are spaced apart on one end of the shell (9) extending into the inner hole of the pressing ring (1), and the screws I (3) pass through the threaded holes I and the threaded blind holes I to fix the shell (9) in the pressing ring (1). A plurality of threaded holes II are spaced apart on the side wall of the other end of the shell (9); A plurality of threaded blind holes II are spaced apart on the side wall of the ring (6), and the screws II (5) pass through the threaded holes II and the threaded blind holes II to fix the ring (6) in the shell (9).

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