Electric screwdriver

Abstract

The utility model relates to the technical field of electric screwdrivers, and particularly discloses an electric screwdriver which comprises a handle shell, a front locking ring, a circuit board, a motor, a clutch, a speed reduction torque conversion box, a transmission shaft, a forward and reverse rotation switch, a starting switch and a gear tail power line. The switch is characterized by further comprising a microswitch and a switch guide rod, a mounting frame is arranged in the handle shell, the microswitch is arranged in the mounting frame and matched with the circuit board, and one end of the switch guide rod is matched with the microswitch; therefore, after the screw is tightened, the spring cover, the torsion spring and the thrust plate vibrate up and down and move up and down along the transmission shaft, the stop steel ball is pressed into the first blind hole in the moving process of the spring cover, then the stop steel ball presses the wineglass-shaped stop block to move towards one end of the motor, the switch guide rod is pushed through the ceramic rod, and the switch is switched on and switched off. When the screw rotates, the switch guide rod triggers the microswitch, and when the switch guide rod is in contact with the microswitch, the circuit board controls the motor to be powered off so as to stop continuously applying the torsion to the screw.

Description

Technical Field

[0001] This utility model relates to the field of electric screwdriver technology, specifically to electric screwdrivers. Background Technology

[0002] An electric screwdriver, also known as an electric screwdriver, is a power tool used to tighten or loosen screws. Most common electric screwdrivers are handheld, equipped with a bit and a switch. Internally, they contain a power supply and a motor. Users can activate the switch to power the motor, which in turn rotates the bit.

[0003] CN208342688U discloses an electric screwdriver with adjustable torque, which can adjust the torque to adapt to different usage needs; however, in actual use, when tightening screws, the electric screwdriver will continue to apply torque to the screw after the screw has been rotated to the correct position, which can easily cause damage to the screw and the parts that have been screwed in, so it still has certain defects in use.

[0004] Therefore, electric screwdrivers are urgently needed to address the technical problems described above. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defects of the above-mentioned technology and provide an electric screwdriver.

[0006] To solve the above-mentioned technical problems, the present invention provides an electric screwdriver: comprising a handle housing, a front locking ring, a circuit board, a motor, a clutch, a reduction torque converter, a drive shaft, a forward / reverse switch, a start switch, and a tail power cord; the motor, clutch, and reduction torque converter are all disposed inside the handle housing; the circuit board is disposed at one end of the motor inside the handle housing; the drive shaft is disposed inside the clutch and reduction torque converter; the motor shaft is connected to the clutch; the forward / reverse switch is disposed on one side of the handle housing and is connected to the circuit board; the start switch is rotatably disposed on the handle housing and is connected to the circuit board; the tail power cord is disposed at the tail of the handle housing and is connected to the circuit board via a wire; the front locking ring is provided at the front end of the handle housing; the screwdriver is characterized in that it further comprises a micro switch and a switch guide rod; a mounting bracket is provided inside the handle housing; the micro switch is disposed inside the mounting bracket and cooperates with the circuit board; a first through hole is provided inside the motor shaft; the switch guide rod is slidably disposed in the first through hole; one end of the switch guide rod cooperates with the micro switch;

[0007] The drive shaft has a first blind hole at one end near the motor, and the drive shaft has symmetrical circular holes extending into the first blind hole;

[0008] The reduction torque converter includes a sleeve housing, a clutch head, a torque push plate, a torque spring, a spring cover, a thrust plate, a ceramic rod, a screwdriver bit cap spring, a screwdriver bit cap, a torque adjusting ring, and a goblet-shaped stop block. One end of the sleeve housing is threadedly connected to the clutch. The drive shaft is housed within the sleeve housing. The clutch head is fitted onto the end of the drive shaft with a first blind hole. The torque push plate is fitted onto one side of the clutch head on the drive shaft. A two-stage spring is fitted onto the torque push plate. The spring cover is fitted onto one side of the two-stage spring on the drive shaft. The torque spring is fitted onto one side of the spring cover on the drive shaft. The thrust plate is fitted onto one side of the torque spring on the drive shaft. A spherical groove is symmetrically provided on one side of the thrust plate on the drive shaft. A screwdriver bit insertion port is provided at the end of the drive shaft with the spherical groove. The spherical groove and the screwdriver bit insertion port are connected. A screwdriver bit cap steel rod is provided inside the spherical groove. The drive shaft has a spherical groove at one end, which is fitted with a screwdriver bit cap spring. A screwdriver bit cap is fitted over the spring. The drive shaft also has a screwdriver bit cap groove at the spherical groove, with a screwdriver bit cap C-ring inside the groove. The other end of the sleeve housing and the torque adjusting ring are both threaded. The sleeve housing and the torque adjusting ring are connected by threads. The sleeve housing has an end sleeve at one end. Multiple insertion holes are evenly distributed on the outer side of the end sleeve at one end, extending into the sleeve housing. A torque adjusting rod is installed in each insertion hole. One end of the torque adjusting rod extends into the sleeve housing and abuts against the thrust plate. The other end of the torque adjusting rod abuts against the inner wall of the torque adjusting ring. The end sleeve has a torque ring groove at one end, with a torque ring C-ring inside. The torque ring C-ring and the torque adjusting ring cooperate.

[0009] The goblet-shaped stop block is disposed in the first blind hole, and a stop steel ball is disposed in the round hole. The stop steel ball and the goblet-shaped stop block cooperate. One end of the goblet-shaped stop block is provided with a second blind hole. One end of the ceramic rod is located in the second blind hole, and the other end of the ceramic rod is located in the first through hole and in contact with the switch guide rod. The stop steel ball cooperates with the spring cover.

[0010] The advantages of this utility model compared with the prior art are as follows:

[0011] The device includes a micro switch and a switch guide rod. A first through hole is located within the motor shaft, and the switch guide rod slides within this hole. One end of the switch guide rod engages with the micro switch. A goblet-shaped stop block is positioned within a first blind hole, containing a stop ball that engages with the goblet-shaped stop block. A second blind hole is located at one end of the goblet-shaped stop block, with one end of a ceramic rod positioned within the second blind hole and the other end positioned within the first through hole, contacting the switch guide rod. When the screw is tightened, the spring cover, torsion spring, and thrust plate vibrate up and down, moving along the drive shaft. During this movement, the spring cover presses the stop ball into the first blind hole, which in turn presses the goblet-shaped stop block towards the motor end. This, in turn, pushes the switch guide rod via the ceramic rod, triggering the micro switch. When the switch guide rod contacts the micro switch, the circuit board cuts off power to the motor, stopping the application of torque to the screw and better protecting the screw and the parts fitted with it. Attached Figure Description

[0012] Figure 1 This is an exploded view of the structure of the electric screwdriver of this utility model.

[0013] Figure 2 This is a front perspective view of the drive shaft of the electric screwdriver of this utility model.

[0014] Figure 3 This is a rear perspective view of the drive shaft of the electric screwdriver of this utility model.

[0015] Figure 4 This is a structural schematic diagram of the electric screwdriver sleeve housing of this utility model.

[0016] As shown in the figure:

[0017] 1. Handle housing; 2. Front locking ring; 3. Circuit board; 4. Motor; 5. Clutch; 6. Reducer torque converter; 7. Drive shaft; 8. Forward / reverse switch; 9. Start switch; 10. Gearbox power cable; 11. Micro switch; 12. Switch guide rod; 13. Mounting bracket; 14. First through hole; 15. First blind hole; 16. Round hole; 17. Sleeve housing; 18. Clutch head; 19. Torque push plate; 20. Torque spring; 21. Spring cover; 22. Thrust plate; 23. Ceramic rod; 24. Screwdriver bit cap spring; 25. 26. Screwdriver bit cap, 27. Torque adjusting ring, 28. Goblet-shaped stop block, 29. Two-stage spring, 30. Spherical groove, 31. Screwdriver bit groove, 32. Screwdriver bit socket, 33. Screwdriver bit ball, 34. Screwdriver bit C-ring, 35. Thread, 36. End shell, 37. Insertion hole, 38. Torque adjusting bar, 49. Torque ring groove, 40. Torque ring C-ring, 41. Stop ball, 42. Second blind hole, 43. Limiting post, 44. Limiting groove, 45. Fixing plate, 46. Ground wire, 47. Main power cable. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Combined with appendix Figure 1-4 An electric screwdriver includes a handle housing 1, a front locking ring 2, a circuit board 3, a motor 4, a clutch 5, a reduction torque converter 6, a drive shaft 7, a forward / reverse switch 8, a start switch 9, and a power cord 10. The motor 4, clutch 5, and reduction torque converter 6 are all housed within the handle housing 1. The circuit board 3 is located at one end of the motor 4 within the handle housing 1. The drive shaft 7 is located within the clutch 5 and the reduction torque converter 6. The shaft of the motor 4 is connected to the clutch 5. The forward / reverse switch 8 is located on one side of the handle housing 1 and is connected to the circuit board 3. The start switch 9 is rotatably mounted on the handle housing 1 and is connected to the circuit board 3. The circuit board 3 is connected and cooperates with the power cord 10 at the tail of the handle housing 1 and is connected to the circuit board 3 through a line. The power cord 10 is connected to the power supply through the main power cord 46. The front end of the handle housing 1 is provided with a front locking ring 2. The handle housing 1 is characterized by further including a micro switch 11 and a switch guide rod 12. The handle housing 1 is provided with a mounting bracket 13. The micro switch 11 is provided in the mounting bracket 13 and cooperates with the circuit board 3. The rotating shaft of the motor 4 is provided with a first through hole 14. The switch guide rod 12 is slidably disposed in the first through hole 14. One end of the switch guide rod 12 cooperates with the micro switch 11.

[0020] The drive shaft 7 is provided with a first blind hole 15 at one end near the motor 4, and the drive shaft 7 is provided with symmetrical circular holes 16 extending into the first blind hole 15.

[0021] The reduction torque converter 6 includes a sleeve housing 17, a clutch head 18, a torque push plate 19, a torque spring 20, a spring cover 21, a thrust plate 22, a ceramic rod 23, a screwdriver bit cap spring 24, a screwdriver bit cap 25, a torque adjusting ring 26, and a goblet-shaped stop block 27. One end of the sleeve housing 17 is threadedly connected to the clutch 5. The drive shaft 7 is disposed inside the sleeve housing 17. The clutch head 18 is fitted onto one end of the drive shaft 7, which has a first blind hole 15. The torque push plate 19 is fitted onto one side of the clutch head 18 on the drive shaft 7. A two-segment spring 28 is fitted onto the torque push plate 19. A spring cover 21 is fitted onto one side of the two-segment spring 28 on the drive shaft 7. A torque spring 20 is fitted onto one side of the spring cover 21 on the drive shaft 7. A thrust plate 22 is fitted onto one side of the torque spring 20 on the drive shaft 7. A spherical groove 29 is symmetrically provided on one side of the thrust plate 22 on the drive shaft 7. A screwdriver bit insertion port 31 is provided at one end of the drive shaft 7 with the spherical groove 29. The spherical groove 29 and the screwdriver bit insertion port 31 are connected. A screwdriver bit cap is provided inside the spherical groove 29. The drive shaft 7 has a ball bearing 32. A screwdriver bit cap spring 24 is fitted onto one end of the drive shaft 7 with a spherical groove 29. A screwdriver bit cap 25 is fitted over the screwdriver bit cap spring 24 on the drive shaft 7. A screwdriver bit cap ring groove 30 is provided at one end of the drive shaft 7 with the spherical groove 29. A screwdriver bit cap C-ring 33 is provided inside the screwdriver bit cap ring groove 30. The other end of the sleeve housing 17 and the torque adjusting ring 26 are both provided with threads 34. The sleeve housing 17 and the torque adjusting ring 26 are connected by the threads 34. An end sleeve 35 is provided at the end of the sleeve housing 17. The sleeve shell 17 has a plurality of insertion holes 36 evenly provided on the outer side of the end shell 35. The insertion holes 36 penetrate into the interior of the sleeve shell 17. A torque adjusting rod 37 is provided in the insertion hole 36. One end of the torque adjusting rod 37 extends into the sleeve shell 17 and abuts against the thrust plate 22. The other end of the torque adjusting rod 37 abuts against the inner wall of the torque adjusting ring 26. The end shell 35 has a torque ring groove 38. A torque ring C ring 39 is provided in the torque ring groove 38. The torque ring C ring 39 and the torque adjusting ring 26 cooperate.

[0022] The goblet-shaped stop block 27 is disposed in the first blind hole 15, and the round hole 16 is provided with a stop steel ball 40. The stop steel ball 40 and the goblet-shaped stop block 27 cooperate. One end of the goblet-shaped stop block 27 is provided with a second blind hole 41. One end of the ceramic rod 23 is located in the second blind hole 41, and the other end of the ceramic rod 23 is located in the first through hole 14 and contacts the switch guide rod 12. The stop steel ball 40 cooperates with the spring cover 21.

[0023] The inner wall of the handle housing 1 is provided with a limiting post 42, and the motor 4 and clutch 5 are provided with limiting grooves 43. The limiting post 42 and the limiting groove 43 cooperate to limit the motor 4 and clutch 5.

[0024] The mounting bracket 13 is provided with a fixing plate 44 at its upper end, and the fixing plate 44 and the mounting bracket 13 are connected by screws.

[0025] The screwdriver bit cap C-ring 33 and screwdriver bit cap 25 cooperate to limit the screwdriver bit cap 25.

[0026] One end of the gear tail power line 10 is provided with a ground wire 45, and the other end of the ground wire 45 is connected to the clutch 5.

[0027] In specific implementation of this utility model:

[0028] Connect the main power line 46 and the tail power line 10, then connect to the mains power through the main power line 46, and transmit the power to the circuit board 3 through the tail power line 10. The start and stop of the motor 4 are controlled by the start switch 9, and the forward and reverse rotation of the motor 4 is controlled by the forward and reverse rotation switch 8.

[0029] When the electric screwdriver is working, the motor 4 is powered and rotates, which drives the transmission shaft 7 to rotate via the clutch 5 and the reduction torque converter 6. This drives the screwdriver bit installed in the screwdriver bit socket 31 to rotate and tighten the screw. After the screw is tightened, the spring cover 21, the torsion spring 20, and the thrust plate 22 will vibrate up and down and move up and down along the transmission shaft 7. During the movement of the spring cover 21, the stop steel ball 40 will be pressed into the first blind hole 15. Then the stop steel ball 40 will enter the groove of the goblet-shaped stop block 27, which will then press the goblet-shaped stop block 27 to move towards the motor 4. The goblet-shaped stop block 27 will push the switch guide rod 12 through the ceramic rod 23. The switch guide rod 12 will touch the micro switch 11. When the switch guide rod 12 and the micro switch 11 are in contact, the circuit board 3 will control the motor 4 to cut off the power, thereby stopping the application of torque to the screw and better protecting the screw and the parts with the screw in it.

[0030] When adjusting the torque, rotating the torque adjusting ring 26 in the forward direction will cause the torque adjusting ring 26 to press down the torque adjusting rod 37. One end of the torque adjusting rod 37 will then press down the thrust plate 22, which in turn presses down the torque spring 20, causing the torque spring 20 to be compressed and thus increasing the torque. Rotating the torque adjusting ring 26 in the reverse direction will decrease the torque.

[0031] In the description of the embodiments of this utility model, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, 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, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and "third" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of the embodiments of this utility model, "a plurality of" means at least two.

[0034] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.

[0035] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. An electric screwdriver, comprising a handle housing (1), a front locking ring (2), a circuit board (3), a motor (4), a clutch (5), a reduction torque converter (6), a drive shaft (7), a forward / reverse switch (8), a start switch (9), and a tail power cord (10); wherein the motor (4), clutch (5), and reduction torque converter (6) are all disposed inside the handle housing (1), the circuit board (3) is disposed at one end of the motor (4) inside the handle housing (1), the drive shaft (7) is disposed inside the clutch (5) and the reduction torque converter (6), the rotating shaft of the motor (4) is connected to the clutch (5), the forward / reverse switch (8) is disposed on one side of the handle housing (1) and is connected to the circuit board (3), the start switch (9) is rotatably disposed on the handle housing (1) and is connected to the circuit board (3), the tail power cord (10) is disposed at the tail of the handle housing (1) and is connected to the circuit board (3) via a line, and the front locking ring (2) is provided at the front end of the handle housing (1), characterized in that: It also includes a micro switch (11) and a switch guide rod (12). The handle housing (1) is provided with a mounting bracket (13). The micro switch (11) is set in the mounting bracket (13) and cooperates with the circuit board (3). The rotating shaft of the motor (4) is provided with a first through hole (14). The switch guide rod (12) is slidably set in the first through hole (14). One end of the switch guide rod (12) cooperates with the micro switch (11). The drive shaft (7) is provided with a first blind hole (15) at one end near the motor (4). The drive shaft (7) is symmetrically provided with round holes (16) extending into the first blind hole (15).The reduction torque converter (6) includes a sleeve housing (17), a clutch head (18), a torque push plate (19), a torque spring (20), a spring cover (21), a thrust plate (22), a ceramic rod (23), a screwdriver bit cap spring (24), a screwdriver bit cap (25), a torque adjusting ring (26), and a goblet-shaped stop block (27). One end of the sleeve housing (17) is threadedly connected to the clutch (5). The drive shaft (7) is disposed inside the sleeve housing (17). The clutch head (18) is fitted onto the end of the drive shaft (7) that has a first blind hole (15). The torque push plate (19) is fitted onto the clutch head (18) on the drive shaft (7). On one side, a two-segment spring (28) is fitted on the torque push plate (19). The spring cover (21) is fitted on one side of the two-segment spring (28) on the drive shaft (7). The torque spring (20) is fitted on one side of the spring cover (21) on the drive shaft (7). The thrust plate (22) is fitted on one side of the torque spring (20) on the drive shaft (7). A spherical groove (29) is symmetrically provided on one side of the thrust plate (22) on the drive shaft (7). A screwdriver bit insertion port (31) is provided at one end of the drive shaft (7) with the spherical groove (29). The spherical groove (29) and the screwdriver bit insertion port (31) are connected. The spherical groove (29) is provided with The drive shaft (7) has a screwdriver bit cap ball (32), and a screwdriver bit cap spring (24) is fitted on one end of the drive shaft (7) with a spherical groove (29). A screwdriver bit cap (25) is fitted on the screwdriver bit cap spring (24) on the drive shaft (7). A screwdriver bit cap ring groove (30) is provided on one end of the drive shaft (7) with a spherical groove (29). A screwdriver bit cap C-ring (33) is provided in the screwdriver bit cap ring groove (30). The other end of the sleeve shell (17) and the torque adjusting ring (26) are both provided with threads (34). The sleeve shell (17) and the torque adjusting ring (26) are connected by threads (34). An end sleeve shell is provided at the end of the sleeve shell (17). (35) A plurality of insertion holes (36) are evenly provided on the outer side of one end of the sleeve shell (17). The insertion holes (36) penetrate into the inside of the sleeve shell (17). A torque adjusting rod (37) is provided in the insertion hole (36). One end of the torque adjusting rod (37) extends into the sleeve shell (17) and abuts against the thrust plate (22). The other end of the torque adjusting rod (37) abuts against the inner wall of the torque adjusting ring (26). A torque ring groove (38) is provided at the end of the end of the sleeve shell (35). A torque ring C ring (39) is provided in the torque ring groove (38). The torque ring C ring (39) and the torque adjusting ring (26) cooperate.The goblet-shaped stop block (27) is disposed in the first blind hole (15), and a stop ball (40) is disposed in the round hole (16). The stop ball (40) and the goblet-shaped stop block (27) cooperate. One end of the goblet-shaped stop block (27) is provided with a second blind hole (41). One end of the ceramic rod (23) is located in the second blind hole (41), and the other end of the ceramic rod (23) is located in the first through hole (14) and contacts the switch guide rod (12). The stop ball (40) and the spring cover (21) cooperate.

2. The electric screwdriver according to claim 1, characterized in that: The inner wall of the handle housing (1) is provided with a limiting post (42), and the motor (4) and clutch (5) are provided with limiting grooves (43). The limiting post (42) and the limiting groove (43) cooperate to limit the motor (4) and clutch (5).

3. The electric screwdriver according to claim 1, characterized in that: The mounting bracket (13) has a fixing plate (44) at its upper end, and the fixing plate (44) and the mounting bracket (13) are connected by screws.

4. The electric screwdriver according to claim 1, characterized in that: The screwdriver bit cap C-ring (33) and screwdriver bit cap (25) work together to limit the screwdriver bit cap (25).

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