Rotary assembly type electric wrench and assembly method

Abstract

The present invention discloses a rotary assembly type electric wrench with an impact function. The electric wrench includes a first component and a second component. The first component includes a rear housing and a stator mounted on the inner wall of the rear housing. An opening is provided at one end of the rear housing, and a threaded hole is provided at the bottom of the rear housing. The second component includes a cover plate, a rotor, a driving member, a driving mechanism body, an output shaft, a ball bearing and a bearing seat. The cover plate is mounted on the opening of the rear housing, the driving mechanism body is mounted on the outer side of the cover plate, the output shaft and the rotor are coaxially arranged on opposite sides of the cover plate, the driving member is arranged in the threaded hole and fixedly connected to the rotor, and the driving member is disengaged from the bearing seat. The rotor can slide freely along the axis of the rotor in the inner ring, and the driving member can contact the bearing seat to make the rotor and the bearing seat transmission connected. The present invention also proposes an assembly method of an electric wrench. The ball bearing is not easy to be damaged and has small vibration when used.

Description

Technical Field

[0001] The invention relates to the technical field of electric wrenches, and in particular to a rotary assembly type electric wrench. Background Art

[0002] The existing electric wrench with impact function includes a first component, which includes a cover plate and a driving mechanism. The driving mechanism includes a driving mechanism body, a rotor, an output shaft and a ball bearing. The driving mechanism body is installed on the cover plate, and the rotor and the output shaft are arranged on opposite sides of the cover plate. The rotor is coaxially connected with the output shaft through the driving mechanism body. The ball bearing includes an inner ring and an outer ring, and the inner ring is interference-fitted at one end of the rotor away from the output shaft; the electric wrench also includes a second component, which includes a rear shell, a stator installed on the inner side of the rear shell, and a handle fixedly connected to the outer side of the rear shell, one end of the rear shell is provided with an opening adapted to the cover plate, and the bottom of the rear shell is provided with a mounting groove adapted to the ball bearing.

[0003] When assembling the electric wrench, the ball bearing needs to be installed in the installation groove to assemble the first component and the second component together; the existing assembly methods are as follows:

[0004] The first reference Fig.13 and Fig.14 The rear shell is a split structure, and the rear shell is composed of two half shells 991. The stator 992 is installed on the inner side of the half shell, and the handle 993 is fixedly connected to the outer side of one of the half shells. One end of each half shell is provided with a limit groove 994 with a notch facing the other half shell. During assembly, the first component 995 is placed between the two half shells, and then the two half shells are assembled together. The ball bearing 996 is stuck between the two limit grooves. Finally, the cover plate is locked on the half shell to complete the installation. In this way, a gap is easily generated between the limit groove and the ball bearing, and the electric wrench vibrates greatly when in use.

[0005] The second reference Fig.15, the rear housing is integrally formed, the mounting groove 881 is adapted to the outer ring of the ball bearing, during assembly, the rotor 882 is coaxial with the mounting groove, the end of the rotor close to the ball bearing faces the mounting groove, and the pressing device is used to drive the rotor to move toward the mounting groove. After the outer ring 883 of the ball bearing contacts the side wall of the mounting groove, the pressing device continues to advance, and the pressing device transmits the pressure to the outer ring through the rotor, the inner ring 884 of the ball bearing, and the ball 885 of the ball bearing, and finally presses the outer ring into the mounting groove, and the outer ring and the mounting groove have an interference fit; in this way, although the outer ring and the mounting groove have an interference fit, the bearing is not easy to shake when the rotor rotates, that is, the stability of the rotor is good, but in this way, if the machining accuracy of the mounting groove does not meet the standard, when the ball bearing is pressed in, the inner ring, the ball and the outer ring are subjected to large force, and the ball bearing is easily crushed; and when the electric wrench impacts, the driving mechanism body generates axial vibration, and the axial vibration is transmitted to the ball bearing through the rotor, and the ball bearing is easily damaged under long-term vibration. Summary of the invention

[0006] In order to solve the shortcomings of the existing electric wrench, that the ball bearing is easily damaged and has large vibration during use, the present invention provides a rotary assembly type electric wrench, the ball bearing is not easily damaged and has small vibration during use.

[0007] To achieve the above object, the present invention adopts the following technical solution:

[0008] A rotary assembly electric wrench with an impact function comprises a first component and a second component; the first component comprises a rear housing and a stator mounted on the inner wall of the rear housing, one end of the rear housing is provided with an opening, and the bottom of the rear housing is provided with a threaded hole; the second component comprises a cover plate, a rotor, a driving member, a driving mechanism body, an output shaft, a ball bearing and a bearing seat, the cover plate is installed on the opening of the rear housing, the driving mechanism body is installed on the outside of the cover plate, the output shaft and the rotor are coaxially arranged on opposite sides of the cover plate, the side of the rotor away from the cover plate passes through the inner ring of the ball bearing and is transmission-connected to the inner ring through a spline, the bearing seat is interference-fitted on the outside of the outer ring of the ball bearing, the bearing seat is threadedly connected to the threaded hole, the driving member is arranged in the threaded hole and fixedly connected to the rotor, and the driving member is disengaged from the bearing seat; the rotor can slide freely along the axis of the rotor in the inner ring, and the driving member can contact the bearing seat to transmission-connect the rotor and the bearing seat.

[0009] Through the above arrangement, firstly, the ball bearing is installed in the threaded hole by rotation to prevent the ball bearing from being crushed; secondly, the bearing seat is screwed into the threaded hole, and the bearing seat and the ball bearing are not easy to shake, thereby increasing the stability of the rotor and reducing the vibration of the rotor; thirdly, when the electric wrench impacts and the rotor vibrates axially, the rotor and the inner ring of the ball bearing can slide relative to each other, thereby reducing the force on the ball bearing and preventing the ball bearing from being damaged.

[0010] Furthermore, a protrusion is provided on the side of the bearing seat away from the cover plate, and a notch matched with the protrusion is provided on the driving member. When the protrusion is embedded in the notch, the rotor is connected to the bearing seat through the driving member.

[0011] Through the above arrangement, the driving member drives the bearing seat to rotate synchronously via the notch and the protrusion.

[0012] Furthermore, the cover plate is configured to be circular, and the axis of the rotor passes through the center of the cover plate.

[0013] The above arrangement further facilitates the installation of the electric wrench.

[0014] Furthermore, a spline groove is provided at one end of the rotor away from the cover plate, and the inner ring sliding sleeve is provided on the spline groove. The distance from the end of the spline groove close to the cover plate to the inner ring is greater than or equal to 3 mm, and the distance from the protrusion to the notch is greater than or equal to 3 mm.

[0015] Through the above arrangement, the inner ring has enough sliding space on the rotor to prevent the end of the spline groove from contacting the inner ring and the driving member from contacting the bearing seat when the rotor vibrates axially.

[0016] An assembly method, assembling the electric wrench by means of a limiting tool and a tightening lifting mechanism, the specific steps are as follows:

[0017] Step a, placing the first component on the limiting fixture, with the opening of the rear shell facing upward;

[0018] Step b, the output shaft is locked on the tightening lifting mechanism, the end of the rotor close to the ball bearing is vertically arranged just above the threaded hole, and the bearing seat contacts the driving member;

[0019] Step c, tightening the lifting mechanism to drive the second component to move downward, the outer ring of the ball bearing contacts the threaded hole, tightening the lifting mechanism to stop descending, tightening the lifting mechanism to drive the output shaft to rotate around the axis of the output shaft, the output shaft drives the bearing seat to rotate around the axis of the output shaft through the rotor and the driving member, and the bearing seat is tightened in the threaded hole;

[0020] Step d, tighten the lifting mechanism to drive the second component to move downward, the cover plate covers the opening of the rear shell, the driving member is disengaged from the bearing seat, the tightening lifting mechanism is separated from the output shaft, and the electric wrench is removed from the limit tooling.

[0021] Furthermore, the limiting tooling includes: a bottom plate and a limiting seat; the bottom plate is arranged horizontally; the limiting seat is fixedly connected to the upper side of the bottom plate, and the upper side of the limiting seat is provided with a contoured groove adapted to the rear shell;

[0022] In step a, the rear shell is placed into the contoured groove from the upper side of the limiting seat, and the contoured groove fits the outer wall of the rear shell to prevent the rear shell from shaking and rotating.

[0023] Furthermore, the tightening lifting mechanism includes: a guide rod, a lifting plate, a rotating mechanism, a top plate and a lifting mechanism; the guide rod is vertically installed on the upper side of the bottom plate; the lifting plate is slidably connected to the guide rod; the rotating mechanism includes a transmission sleeve, a connector, a spring, a locking piece and a servo motor, the transmission sleeve is vertically rotatably connected to the lower side of the lifting plate, the upper end of the connector is slidably connected to the transmission sleeve, the transmission sleeve can drive the connector to rotate synchronously, the spring is installed between the transmission sleeve and the connector to help the connector reset, the lower end of the connector is provided with a slot adapted to the output shaft, the locking piece is threadedly connected to one side of the connector, the servo motor is installed on the lifting plate, and can drive the transmission sleeve to rotate; the top plate is installed on the upper end of the guide rod; the lifting mechanism is installed on the top plate, and the lifting mechanism can drive the lifting plate to move up and down;

[0024] In step b, the output shaft is inserted into the slot, and the locking piece is tightened, so that the locking piece presses the output shaft to lock the output shaft on the connector;

[0025] In step c, the lifting mechanism drives the lifting plate, the rotating mechanism and the second component to move downward, the servo motor drives the transmission sleeve to rotate, the transmission sleeve drives the output shaft to rotate around the output shaft axis through the connector, the connector moves downward along the slot, and the bearing seat is tightened in the threaded hole;

[0026] In step d, the lifting mechanism drives the second component to move downward to cover the opening of the rear shell, the driving member is disengaged from the bearing seat, the locking member is loosened, the locking member is disengaged from the output shaft, and the lifting mechanism drives the connecting head to move upward. After the output shaft leaves the slot, the lifting mechanism is tightened to separate the output shaft, and after taking it out of the contoured groove in the rear shell, the electric wrench is taken out from the limit tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of an electric wrench according to an embodiment.

[0028] Figure 2 for Figure 1 Enlarged view of point A.

[0029] Figure 3 for Figure 2 BB cross-sectional view.

[0030] Figure 4 Schematic diagram of a bearing seat of an embodiment.

[0031] Figure 5 Schematic diagram of a driving member of an embodiment.

[0032] Figure 6 Schematic diagram of the contact between the bearing seat and the threaded hole of the embodiment.

[0033] Figure 7 for Figure 6 Enlarged view of point D.

[0034] Figure 8 It is a schematic diagram of the bearing seat of the embodiment being screwed into the threaded hole.

[0035] Fig. 9 for Figure 8 Enlarged view of point E.

[0036] Fig.10 Schematic diagram of a cover plate covering the rear housing according to an embodiment.

[0037] Fig.11 for Fig.10 Enlarged view of point F.

[0038] Fig.12 A schematic diagram of assembling the second component.

[0039] Fig.13 The assembly diagram of the existing electric wrench is shown as follows: Figure 1 .

[0040] Fig.14 The assembly diagram of the existing electric wrench is shown as follows: Figure 2 .

[0041] Fig.15 The assembly diagram of the existing electric wrench is shown as follows: Figure 3 . DETAILED DESCRIPTION

[0042] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0043] See also Figures 1 to 12 , a rotary assembly type electric wrench with an impact function, the electric wrench comprising a first component 3 and a second component 4;

[0044] The first component 3 includes a rear housing 31 and a stator 32 mounted on the inner wall of the rear housing 31 , one end of the rear housing 31 is provided with an opening, and the bottom of the rear housing 31 is provided with a threaded hole 311 ;

[0045] The second component 4 includes a cover plate 41, a rotor 42, a driving member 43, a driving mechanism body 44, an output shaft 45, a ball bearing 46 and a bearing seat 47. The cover plate 41 is installed on the opening of the rear housing 31, and the driving mechanism body 44 is installed on the outside of the cover plate 41. The output shaft 45 and the rotor 42 are coaxially arranged on opposite sides of the cover plate 41. The side of the rotor 42 away from the cover plate 41 passes through the inner ring 461 of the ball bearing 46 and is transmission-connected to the inner ring 461 through a spline. The bearing seat 47 is interference-fitted on the outside of the outer ring 462 of the ball bearing 46. The bearing seat 47 is threadedly connected to the threaded hole 311. The driving member 43 is arranged in the threaded hole 311 and fixedly connected to the rotor 42. The driving member 43 is disengaged from the bearing seat 47; the rotor 42 can slide freely along the axis of the rotor 42 in the inner ring 461, and the driving member 43 can contact with the bearing seat 47 to make the rotor 42 and the bearing seat 47 transmission-connected.

[0046] Through the above arrangement, first, the ball bearing 46 is installed in the threaded hole 311 by rotation to prevent the ball bearing 46 from being crushed; second, the bearing seat 47 is screwed into the threaded hole 311, and the bearing seat 47 and the ball bearing 46 are not easy to shake, thereby increasing the stability of the rotor 42 and reducing the vibration of the rotor 42; third, when the electric wrench impacts and the rotor 42 vibrates axially, the rotor 42 and the inner ring 461 of the ball bearing 46 can slide relative to each other, thereby reducing the force on the ball bearing 46 and preventing the ball bearing 46 from being damaged.

[0047] In the present application, the driving mechanism body 44 has an impact function, and reference can be made to the existing electric wrench; the first component 3 and the second component 4 have been pre-assembled. Specifically, when the second component 4 is pre-assembled, refer to Fig.12 , the outer ring 462 of the ball bearing 46 can be press-fitted into the bearing seat 47 by a press-fitting device. During press-fitting, the press-fitting device only squeezes the outer ring 462 to prevent the ball bearing 46 and the inner ring 461 from being subjected to force and causing the ball bearing 46 to be crushed. Then, the inner ring 461 of the ball bearing 46 equipped with the bearing seat 47 is sleeved on the rotor 42 from the lower end of the rotor 42 to realize the spline connection between the rotor 42 and the inner ring 461. The extension direction of the spline is parallel to the axis of the rotor 42. When the inner ring 461 and the rotor 42 are connected by spline transmission, the rotor 42 can drive the inner ring 461 to rotate synchronously, and the inner ring 461 and the rotor 42 can slide relative to each other, and the sliding direction is parallel to the axis of the rotor 42. After that, the driving member 43 is installed at the lower end of the rotor 42 by welding or other methods. The present application can assemble the electric wrench by means of a limit fixture and a tightening lifting mechanism. Specifically, the first component 3 and the second component 4 are assembled together by means of a limit fixture and a tightening lifting mechanism. The specific steps of assembly are as follows:

[0048] Step a, see Figure 6 and Figure 7, place the first component 3 on the limiting fixture, with the opening of the rear shell 31 facing upward; the opening of the rear shell 31 is horizontal, and a plurality of bolt holes are arranged on the edge of the opening, and the limiting fixture prevents the rear shell 31 from shaking and rotating; wherein the limiting fixture can adopt an existing fixture;

[0049] Step b, the output shaft 45 is locked on the tightening lifting mechanism, the end of the rotor 42 close to the ball bearing 46 is vertically arranged directly above the threaded hole 311, and the bearing seat 47 contacts the driving member 43; specifically, after the output shaft 45 is locked on the tightening lifting mechanism, the cover plate 41 is horizontal, the end of the rotor 42 close to the ball bearing 46 is downward and arranged directly above the threaded hole 311, under the action of gravity, the ball bearing 46 and the bearing seat 47 slide downward along the rotor 42, the bearing seat 47 contacts the driving member 43, the driving member 43 supports the bearing seat 47, and the rotor 42 is connected to the bearing seat 47 through the driving member 43;

[0050] Step c, see Figure 8 and Fig. 9 , tighten the lifting mechanism to drive the second component 4 to move downward, the outer ring 462 of the ball bearing 46 contacts the threaded hole 311, tighten the lifting mechanism to stop the descent, tighten the lifting mechanism to drive the output shaft 45 to rotate around the axis of the output shaft 45, see Fig.10 and Fig.11 , the output shaft 45 drives the bearing seat 47 to rotate around the axis of the output shaft 45 through the rotor 42 and the driving member 43, and the bearing seat 47 is screwed into the threaded hole 311; specifically, the tightening and lifting mechanism has the lifting and rotating functions. The tightening and lifting mechanism first drives the second component 4 to move downward, so that the bearing seat contacts the threaded hole 311, and drives the second component 4 to rotate around the axis of the rotor 42. The rotor 42 drives the bearing seat 47 to rotate synchronously around the axis of the rotor 42 through the driving member 43, and the bearing seat 47 is screwed downward into the threaded hole 311. During the process of the bearing seat 47 being screwed downward, the bearing The seat 47 is pressed downwardly against the upper side of the driving member 43, so that the transmission between the bearing seat 47 and the driving member 43 is stable, and at the same time, the second component 4 and the ball bearing 46 are pushed downwardly, so that the ball bearing 46 smoothly enters the threaded hole 311 until the bearing seat 47 is screwed into the threaded hole 311. In the process of the bearing seat 47 being screwed into the threaded hole 311, the ball bearing 46 is basically not subjected to torque and vertical pressure, so the ball bearing 46 is prevented from being damaged during the installation process; after the bearing seat 47 is screwed into the threaded hole 311, there is a gap between the cover plate 41 and the opening of the rear housing 31;

[0051] Step d, see Fig.11 and Fig.12, the tightening and lifting mechanism drives the second component 4 to move downward, the cover plate 41 covers the opening of the rear shell 31, the driving member 43 is disengaged from the bearing seat 47, the tightening and lifting mechanism is separated from the output shaft 45, and the electric wrench is removed from the limit fixture; specifically, when the tightening and lifting mechanism continues to drive the second component 4 to move downward, the cover plate 41 and the rotor 42 and the driving member 43 move downward synchronously, the cover plate 41 is attached to the upper side of the rear shell 31, and the bearing seat 47 is tightened in the threaded hole 311, so the height of the bearing seat 47 is fixed, and the lower end of the rotor 42 slides relatively with the bearing seat 47, and the driving member 43 The cover plate 41 moves downward and disengages from the bearing seat 47; mounting holes matching the bolt holes are provided on the cover plate 41. In step c, when the lifting mechanism is tightened to drive the rotor 42 to rotate, the cover plate 41 may rotate; in step d, when the cover plate 41 is attached to the upper side of the rear housing 31, the mounting holes and the bolt holes may be misaligned. The cover plate 41 can be manually rotated around the axis of the rotor 42 to make the mounting holes and the bolt holes coincide with each other, and then screws are manually driven into the mounting holes and the bolt holes to lock the cover plate 41 on the rear housing 31. After the lifting mechanism is tightened and the output shaft 45 is separated, the electric wrench is removed from the limit fixture.

[0052] When the electric wrench is in use, the rotor 42 rotates around its own axis driven by electric energy, and the inner ring 461 and the outer ring 462 rotate relative to each other. The ball bearing 46 reduces the rotation resistance of the rotor 42. At the same time, since the bearing seat 47 is screwed into the threaded hole 311, the bearing seat 47 stably supports the ball bearing 46, and the ball bearing 46 is not easy to shake, thereby reducing the shaking of the rotor 42 and further reducing the vibration of the electric wrench; the rotor 42 drives the output shaft 45 to rotate through the driving mechanism body 44. After the output shaft 45 tightens the threaded part to be screwed, the impact function is triggered, and the driving mechanism body 44 vibrates axially. The driving mechanism body 44 drives the rotor 42 to vibrate axially, and the rotor 42 and the inner ring 461 slide relative to each other, preventing the rotor 42 from transmitting the axial vibration to the ball bearing 46, reducing the vibration on the ball bearing 46, and preventing the ball bearing 46 from being damaged.

[0053] As an implementation method, a protrusion 471 is provided on the side of the bearing seat 47 away from the cover plate 41, and a notch 431 adapted to the protrusion 471 is provided on the driving member 43. When the protrusion 471 is embedded in the notch 431, the rotor 42 is connected to the bearing seat 47 through the driving member 43.

[0054] Through the above arrangement, the driving member 43 drives the bearing seat 47 to rotate synchronously through the notch 431 and the protrusion 471 .

[0055] In the present application, a plurality of protrusions 471 are evenly arranged along the circumference of the bearing seat 47, and the height of the protrusions is 3-4mm. The lower side of the protrusions 471 is lower than the lower side of the ball bearing 46. The driving member 43 is basically circular, and the end of the rotor 42 is fixedly connected to the center of the driving member 43. A plurality of notches 431 are evenly arranged along the circumference of the driving member 43, and the shape of the notches 431 is adapted to the protrusions 471. In step b, the driving member 43 supports the bearing seat 47, and the protrusions 471 are embedded in the groove, and the upper side of the driving member is fitted with the lower side of the bearing seat; in step c, the lifting mechanism is tightened to drive the rotor, the ball bearing and the bearing seat to move downward. When the bearing seat contacts the upper end of the threaded hole, the lifting mechanism is tightened to continue to drive the rotor to move downward for 1mm and then stop, so that the external thread of the bearing seat is re-engaged in the bearing seat. The driving member 43 is in full contact with the inner thread of the threaded hole under the force. At this time, the upper side of the driving member and the lower side of the bearing are disengaged by 1mm, which is less than the height of the protrusion. The protrusion is still embedded in the notch, that is, the rotor is still connected to the bearing seat through the driving member. When the lifting mechanism is tightened to drive the rotor to rotate around its axis, the rotor drives the bearing seat to rotate through the driving member, and the bearing seat is rotated into the threaded hole and fits with the upper side of the driving member again. As the bearing seat continues to rotate, the bearing seat pushes the rotor, the cover plate, the driving mechanism body, and the output shaft downward through the driving member; in step d, the driving member 43 moves downward and disengages from the bearing seat 47, and the protrusion 471 disengages from the notch 431. When the electric wrench is in use, the driving member 43 idles and does not contact the bearing seat 47. The bearing seat 47 is stably tightened in the threaded hole 311.

[0056] As an implementation manner, the cover plate 41 is configured to be circular, and the axis of the rotor 42 passes through the center of the cover plate 41 .

[0057] The above arrangement further facilitates the installation of the electric wrench.

[0058] In the present application, the outer edge of the upper side of the rear shell 31 is circular and matches the shape of the cover plate 41. In step d, when the cover plate 41 is attached to the upper side, the outer edge of the cover plate 41 coincides with the outer edge of the upper side of the rear shell 31. The cover plate 41 is manually rotated around the axis of the rotor 42 so that the mounting hole coincides with the bolt hole.

[0059] As an implementation method, a spline groove 421 is provided at one end of the rotor 42 away from the cover plate 41, and a sliding sleeve of an inner ring 461 is provided on the spline groove 421. A distance L1 from an end of the spline groove 421 close to the cover plate 41 to the inner ring 461 is greater than or equal to 3 mm, and a distance L2 from the protrusion 471 to the notch 431 is greater than or equal to 3 mm.

[0060] Through the above arrangement, the inner ring 461 has sufficient sliding space on the rotor 42 to prevent the end of the spline groove 421 from contacting the inner ring 461 when the rotor 42 vibrates axially, and to prevent the driving member 43 from contacting the bearing seat 47.

[0061] As an implementation method, the limiting tooling includes: a bottom plate 5 and a limiting seat 6; the bottom plate 5 is horizontally arranged; the limiting seat 6 is fixedly connected to the upper side of the bottom plate 5, and the upper side of the limiting seat 6 is provided with a contoured groove adapted to the rear housing 31;

[0062] In step a, the rear housing 31 is placed into the contoured groove from the upper side of the limiting seat 6 , and the contoured groove fits the outer wall of the rear housing 31 to prevent the rear housing 31 from shaking and rotating.

[0063] In the present application, an avoidance groove is provided on one side of the profiling groove, and the upper end of the avoidance groove passes through the upper side of the limit seat 6. The electric wrench also includes a handle, which is fixedly connected to one side of the rear shell 31. The rear shell 31 is placed in the profiling groove, and the handle is located in the avoidance groove. The width of the avoidance groove is adapted to the outer diameter of the handle, thereby further preventing the rear shell 31 from rotating.

[0064] As an implementation method, the tightening lifting mechanism includes: a guide rod 7, a lifting plate 8, a rotating mechanism 9, a top plate 10 and a lifting mechanism 11; the guide rod 7 is vertically installed on the upper side of the bottom plate 5; the lifting plate 8 is slidably connected to the guide rod 7; the rotating mechanism 9 includes a transmission sleeve 91, a connector 92, a spring 93, a locking member 94 and a servo motor 95, the transmission sleeve 91 is vertically rotatably connected to the lower side of the lifting plate 8, the upper end of the connector 92 is slidably connected to the transmission sleeve 91, the transmission sleeve 91 can drive the connector 92 to rotate synchronously, the spring 93 is installed between the transmission sleeve 91 and the connector 92 to help the connector 92 reset, the lower end of the connector 92 is provided with a slot adapted to the output shaft 45, the locking member 94 is threadedly connected to one side of the connector 92, the servo motor 95 is installed on the lifting plate 8, and can drive the transmission sleeve 91 to rotate; the top plate 10 is installed on the upper end of the guide rod 7; the lifting mechanism 11 is installed on the top plate 10, and the lifting mechanism 11 can drive the lifting plate 8 to move up and down;

[0065] In the present application, at least two guide rods 7 are provided, both of which are vertically installed on the upper side of the base, the lifting plate 8 and the top plate 10 are both horizontally arranged, and the top plate 10 is arranged parallel to the lifting plate 8. The servo motor 95 can directly drive the transmission sleeve 91, or drive the transmission sleeve 91 through the gear assembly. The servo motor 95 has a torque feedback function. When the bearing seat 47 is tightened in the threaded hole 311, the servo motor 95 stops automatically; the upper end cross section of the connector 92 is square, and the connector 92 can only slide up and down relative to the transmission sleeve 91. but cannot rotate relative to each other; the spring 93 is arranged in the transmission sleeve 91, the upper end of the spring 93 is connected to the transmission sleeve 91, the lower end of the spring 93 is connected to the upper end of the connecting head 92, and the upper end of the connecting head 92 is coaxially fixedly connected with a positioning column, which passes through the spring 93 to prevent the spring 93 from bending; the slot is adapted to the output shaft 45 to prevent the output shaft 45 from shaking in the slot; the lifting mechanism 11 can adopt an electric cylinder, when the electric cylinder is extended, the lifting plate 8 moves downward along the guide rod 7, and when the electric cylinder is shortened, the lifting plate 8 moves upward along the guide rod 7.

[0066] In step b, the output shaft 45 is inserted into the slot, and the locking member 94 is tightened, so that the locking member 94 presses the output shaft 45 to lock the output shaft 45 on the connector 92;

[0067] In step c, the lifting mechanism 11 drives the lifting plate 8, the rotating mechanism 9 and the second component 4 to move downward, the servo motor 95 drives the transmission sleeve 91 to rotate, the transmission sleeve 91 drives the output shaft 45 to rotate around the axis of the output shaft 45 through the connector 92, the connector 92 moves downward along the slot, and the bearing seat 47 is tightened in the threaded hole 311; wherein, a proximity switch or a through-beam switch can be installed on the guide rod 7 to monitor the position of the lifting plate 8, when the bearing seat 47 contacts the threaded hole 311, the electric cylinder stops driving the lifting plate; when the bearing seat 47 is rotated into the threaded hole 311, the connector 92 moves downward along the transmission sleeve 91, and the spring 93 stretches;

[0068] In step d, the lifting mechanism 11 drives the second component 4 to move downward to cover the cover plate 41 on the opening of the rear shell 31, the driving member 43 is disengaged from the bearing seat 47, the locking member 94 is loosened, the locking member 94 is disengaged from the output shaft 45, and the lifting mechanism 11 drives the connecting head 92 to move upward. After the output shaft 45 leaves the slot, the lifting mechanism is tightened to separate the output shaft 45, and after taking it out of the contoured groove in the rear shell 31, the electric wrench is taken out from the limit tooling.

[0069] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A rotary assembly type electric wrench with impact function, characterized in that: The electric wrench comprises a first component and a second component; The first component includes a rear housing and a stator mounted on the inner wall of the rear housing, one end of the rear housing is provided with an opening, and the bottom of the rear housing is provided with a threaded hole; The second component comprises a cover plate, a rotor, a driving member, a driving mechanism body, an output shaft, a ball bearing and a bearing seat, wherein the cover plate is mounted on the opening of the rear housing, the driving mechanism body is mounted on the outside of the cover plate, the output shaft and the rotor are coaxially arranged on opposite sides of the cover plate, the side of the rotor away from the cover plate passes through the inner ring of the ball bearing and is drivingly connected to the inner ring through a spline, the bearing seat is interference-fitted on the outside of the outer ring of the ball bearing, the bearing seat is threadedly connected to the threaded hole, the driving member is arranged in the threaded hole and fixedly connected to the rotor, and the driving member is disengaged from the bearing seat; A protrusion is provided on the side of the bearing seat away from the cover plate, and a notch matched with the protrusion is provided on the driving member. The rotor can slide freely along the axis of the rotor in the inner ring. When the protrusion is embedded in the notch, the rotor is transmission-connected to the bearing seat through the driving member.

2. A rotary assembly type electric wrench according to claim 1, characterized in that: The cover plate is arranged in a circular shape, and the axis of the rotor passes through the center of the circle of the cover plate.

3. The rotary assembly type electric wrench according to claim 1, characterized in that: A spline groove is provided at one end of the rotor away from the cover plate, the inner ring sliding sleeve is provided on the spline groove, the distance from the end of the spline groove close to the cover plate to the inner ring is greater than or equal to 3 mm, and the distance from the protrusion to the notch is greater than or equal to 3 mm.

4. An assembly method, assembling the electric wrench according to claim 1 by means of a limiting fixture and a tightening lifting mechanism, characterized in that: The specific steps are as follows: Step a, placing the first component on the limiting fixture, with the opening of the rear shell facing upward; Step b, the output shaft is locked on the tightening lifting mechanism, the end of the rotor close to the ball bearing is vertically arranged directly above the threaded hole, and the bearing seat contacts the driving member; Step c, the tightening and lifting mechanism drives the second component to move downward, the outer ring of the ball bearing contacts the threaded hole, the tightening and lifting mechanism stops descending, the tightening and lifting mechanism drives the output shaft to rotate around the axis of the output shaft, the output shaft drives the bearing seat to rotate around the axis of the output shaft through the rotor and the driving member, and the bearing seat is tightened in the threaded hole; Step d, the tightening and lifting mechanism drives the second component to move downward, the cover plate covers the opening of the rear shell, the driving member is disengaged from the bearing seat, the tightening and lifting mechanism is separated from the output shaft, and the electric wrench is removed from the limit tooling.

5. An assembly method according to claim 4, characterized in that: The limiting tooling comprises: A bottom plate, the bottom plate is arranged horizontally; A limit seat, the limit seat is fixedly connected to the upper side of the bottom plate, and the upper side of the limit seat is provided with a contoured groove adapted to the rear shell; In step a, the rear shell is placed into the contoured groove from the upper side of the limiting seat, and the contoured groove fits the outer wall of the rear shell to prevent the rear shell from shaking and rotating.

6. An assembly method according to claim 5, characterized in that: The tightening lifting mechanism comprises: A guide rod, the guide rod being vertically mounted on the upper side of the base plate; A lifting plate, the lifting plate being slidably connected to the guide rod; A rotating mechanism, the rotating mechanism comprising a transmission sleeve, a connector, a spring, a locking piece and a servo motor, the transmission sleeve is vertically rotatably connected to the lower side of the lifting plate, the upper end of the connector is slidably connected to the transmission sleeve, the transmission sleeve can drive the connector to rotate synchronously, the spring is installed between the transmission sleeve and the connector to help the connector reset, the lower end of the connector is provided with a slot adapted to the output shaft, the locking piece is threadedly connected to one side of the connector, the servo motor is installed on the lifting plate, and can drive the transmission sleeve to rotate; A top plate, the top plate being mounted on the upper end of the guide rod; A lifting mechanism, the lifting mechanism is installed on the top plate, and the lifting mechanism can drive the lifting plate to move up and down; In step b, the output shaft is inserted into the slot, and the locking member is tightened, so that the locking member presses the output shaft to lock the output shaft on the connector; In step c, the lifting mechanism drives the lifting plate, the rotating mechanism and the second component to move downward, the servo motor drives the transmission sleeve to rotate, the transmission sleeve drives the output shaft to rotate around the output shaft axis through the connector, the connector moves downward along the slot, and the bearing seat is tightened in the threaded hole; In step d, the lifting mechanism drives the second component to move downward to cover the opening of the rear shell, the driving member is disengaged from the bearing seat, the locking member is loosened, the locking member is disengaged from the output shaft, and the lifting mechanism drives the connecting head to move upward. After the output shaft leaves the slot, the tightening lifting mechanism is separated from the output shaft, and after taking it out of the contoured groove in the rear shell, the electric wrench is taken out from the limiting fixture.

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