Torsion control device and control method for electric wrench

Abstract

The invention provides an electric wrench torque control device and a control method, the electric wrench torque control device comprises a speed regulation motor for outputting torque, a speed reduction mechanism for adjusting the torque, a ratchet mechanism for slowly applying the torque to accurately control the torque and a sleeve mechanism for locking a nut, the ratchet mechanism is connected with the speed regulation motor through the speed reduction mechanism, and the sleeve mechanism is connected with the speed regulation motor through the speed reduction mechanism. And the sleeve mechanism is mounted on the ratchet mechanism. The speed regulating motor is adopted as a power source, the torque can be regulated by regulating the rotating speed of the motor, the torque can also be regulated by regulating the transmission ratio of the speed reducing mechanism, and the multi-stage speed reducing structure of the speed reducing mechanism can provide larger torque output.

Description

Technical Field

[0001] The present invention relates to the technical field of electric wrenches, and in particular to a torque control device and a control method for an electric wrench. Background Art

[0002] Electric wrenches are widely used in various industries and fields, especially in automobile manufacturing, machinery manufacturing, aerospace and other fields. Compared with traditional manual wrenches, electric wrenches have higher working efficiency. They can quickly rotate and tighten bolts or nuts, greatly shorten working time and improve production efficiency. However, the torque range of existing electric wrenches is fixed and cannot be flexibly adjusted, so the scope of application is small.

[0003] In view of this, the inventor of this case conducted in-depth research on the above-mentioned issues, which led to the emergence of this case. Summary of the invention

[0004] The first object of the present invention is to provide an electric wrench torque control device that can accurately control the torque output in view of the above shortcomings.

[0005] The first solution adopted by the present invention to solve the technical problem is: an electric wrench torque control device, including a speed regulating motor for generating torque, a speed reduction mechanism for adjusting the torque, a ratchet mechanism for slowly applying torque to accurately control the torque, and a sleeve mechanism for outputting a torque locking nut, wherein the ratchet mechanism is connected to the speed regulating motor via the speed reduction mechanism, and the sleeve mechanism is mounted on the ratchet mechanism;

[0006] The ratchet mechanism includes a ratchet box, a swing assembly and a ratchet assembly. The ratchet box is provided with a handle for holding. The swing assembly and the ratchet assembly are both arranged in the ratchet box. The swing assembly is transmission-connected with the reduction mechanism. The ratchet assembly is transmission-connected with the swing assembly so that the swing assembly can drive the ratchet assembly to rotate forward and reversely. The sleeve mechanism is installed on the ratchet assembly so that the ratchet assembly can drive the sleeve mechanism to rotate unidirectionally to tighten the bolts and nuts.

[0007] Furthermore, in order to slowly and stably output torque to achieve the purpose of accurately controlling torque; the swing assembly includes a driving shaft, a rotating rod, a swing rod, a swing shaft, a fan gear and a swing gear. The driving shaft is rotatably installed in the ratchet box, one end of the driving shaft is transmission-connected to the reduction mechanism, and the other end of the driving shaft is fixedly connected to one end of the rotating rod. The other end of the rotating rod is provided with a slider, the swing shaft is rotatably installed in the ratchet box, one end of the swing rod is fixedly installed on the swing shaft, the swing rod is provided with a slide groove, and the slider is slidably installed on the slide groove so that the swing rod can be driven to swing by the rotation of the rotating rod, the fan gear is coaxially fixedly installed on the swing shaft so as to swing with the swing rod, the swing gear is rotatably installed in the ratchet box, and the swing gear is meshed with the fan gear so as to drive the swing gear to reverse forward and reverse through the back and forth swing of the fan gear, and the swing gear is coaxially fixedly connected to the ratchet assembly to drive the ratchet assembly to reverse forward and reverse.

[0008] Furthermore, in order to achieve one back and forth swing of the swing assembly, the ratchet mechanism rotates one unit amount and slowly outputs torque; the ratchet assembly includes a ratchet shaft, a ratchet, a pawl, a spring and a connecting shaft for installing a sleeve mechanism, the ratchet shaft is rotatably installed in the ratchet box, the ratchet and the swing gear are coaxially fixedly installed on the ratchet shaft, and a turntable is rotatably installed on the ratchet shaft through a bearing, one end of the pawl is rotatably installed on the turntable, and the other end of the pawl is arranged beside the ratchet, one end of the spring is installed on one side of the pawl, and the other end of the spring is installed on the turntable and located on the other side of the pawl, the connecting shaft is rotatably installed on the ratchet box, one end of the connecting shaft is coaxially fixedly connected to the turntable, and the other end of the connecting shaft is connected to the sleeve mechanism via a dynamic torque sensor.

[0009] Furthermore, in order to adapt to nuts of different sizes; the sleeve mechanism includes an outer sleeve and an inner sleeve, the outer sleeve is mounted on the ratchet mechanism, the inner sleeve is fixedly mounted in the outer sleeve through a connecting bracket, six clips for forming hexagonal holes are evenly distributed in the inner sleeve, the six clips are radially slidably mounted on the inner sleeve, and an adjustment component for driving the six clips to slide radially is provided on the outer sleeve so as to adapt to bolts and nuts of different diameters by adjusting the spacing between the clips;

[0010] The adjusting assembly includes six screws evenly distributed in the inner sleeve and an adjusting gear threadedly mounted on the outside of the screws. The six screws are radially slidably mounted on the inner sleeve. A sliding groove is formed on the screws which is radially recessed inward. The inner sleeve is provided with a limiting rib for embedding in the sliding groove to lock the rotation of the screw. The clip is mounted on the inner side of the screw. The adjusting gear is rotatably mounted on the inner sleeve through a bearing so that the screw can be driven to slide radially in the inner sleeve by rotating the adjusting gear.

[0011] Furthermore, in order to drive the six adjusting gears to rotate synchronously, and then drive the six screws to move synchronously to change the spacing between the clips; the sleeve mechanism also includes a synchronization component for synchronously driving the six screws to slide, the synchronization component includes a synchronization gear, a driven gear and a driving gear, a synchronization shaft is rotatably installed between the inner sleeve and the outer sleeve, the synchronization gear is coaxially fixedly installed on the lower side of the synchronization shaft, and the synchronization gear is simultaneously meshed with the six adjusting gears so that the six adjusting gears are driven to rotate synchronously through the rotation of the synchronization gear;

[0012] The driven gear is coaxially fixedly mounted on the upper side of the synchronous shaft, the driving gear is rotatably mounted on the outer sleeve and the driving gear is meshed with the driven gear to drive the synchronous shaft to rotate and then drive the synchronous gear to rotate. The upper side of the outer sleeve is provided with an axially upwardly protruding joint, and the joint is provided with a notch for the driving gear to mesh with the driven gear.

[0013] Furthermore, in order to transmit torque to the socket mechanism; the electric wrench torque control device also includes a plastic shell, a head shell, an impact mechanism and a square shaft, the head shell is installed on the front side of the plastic shell, the speed regulating motor, the reduction mechanism, the impact mechanism and the square shaft are arranged in the plastic shell from the inside to the outside, the reduction mechanism includes a transmission shaft, a sliding gear assembly, a driven gear assembly and a clutch assembly, one end of the transmission shaft is connected to the speed regulating motor, and the other end of the transmission shaft is connected to the sliding gear assembly, the sliding gear assembly is slidably installed in the plastic shell, the driven gear assembly is arranged on the side of the sliding gear assembly so as to engage with the sliding gear assembly, and the clutch assembly is connected to the sliding gear assembly to drive the sliding gear assembly to slide, thereby switching the meshing state of the sliding gear assembly and the driven gear assembly.

[0014] Furthermore, in order to provide multiple transmission ratios to adjust the torque output of the electric wrench; the sliding gear assembly includes a gear seat and a gear shaft, the gear shaft is rotatably mounted on the gear seat, one end of the gear shaft is connected to the transmission shaft, a transmission key is provided on the transmission shaft, a transmission shaft hole for inserting the transmission shaft and a keyway for inserting the transmission key are provided in the gear shaft, a first gear, a second gear and a third gear with different numbers of teeth are provided on the gear shaft along the axial direction of the gear shaft, the gear seat is slidably mounted in a plastic housing, and the clutch assembly is connected to the gear seat to drive the gear seat to slide, thereby switching the first gear, the second gear or the third gear to engage with the driven gear group.

[0015] Furthermore, in order to form a multi-stage gear transmission mechanism to provide a greater torque output; the driven gear assembly includes a primary gear, an intermediate gear, a primary gear shaft, a secondary gear, a secondary gear shaft and a planetary gear set, the primary gear shaft is rotatably mounted in a plastic housing and is located next to the gear shaft, the primary gear is coaxially fixed on the primary gear shaft so as to mesh with the first gear, the second gear or the third gear, the intermediate gear is coaxially fixed on the primary gear shaft, the secondary gear shaft is rotatably mounted in the plastic housing, the secondary gear is coaxially fixed on the secondary gear shaft and the secondary gear meshes with the intermediate gear, the secondary gear shaft is connected to the planetary gear set, and the planetary gear set is connected to the impact mechanism.

[0016] Furthermore, in order to drive the gear seat to slide so as to switch the first gear, the second gear or the third gear to mesh with the driven gear assembly; the clutch assembly includes a clutch motor and a clutch screw group, the clutch motor is installed in a plastic housing, the clutch screw group includes a screw and a screw nut seat, the screw is rotatably installed in the plastic housing, one end of the screw is transmission-connected to the clutch motor, the screw nut seat is transmission-installed on the screw, and the screw nut seat is fixedly connected to the gear seat to drive the gear seat to reciprocate so as to switch the first gear, the second gear or the third gear to mesh with the driven gear assembly.

[0017] A second object of the present invention is to address the above shortcomings and provide a control method for an electric wrench torque control device that can accurately control torque output.

[0018] The second solution adopted by the present invention to solve the technical problem is: a control method of an electric wrench torque control device, comprising the following steps:

[0019] (1) Before use, set the speed of the speed regulating motor and the transmission ratio of the speed reduction mechanism according to the nut to output the required torque;

[0020] (2) Put the inner sleeve on the nut and rotate the driving gear. The driving gear rotates to drive the driven gear to rotate. The synchronous gear coaxially connected to the driven gear rotates synchronously, which will drive the six adjusting gears meshing with the synchronous gear to rotate. Since the adjusting gear is installed on the inner sleeve, the rotational motion of the adjusting gear will be converted into horizontal movement of the screw, which in turn drives the six clips to be fixed on the nut, completing the installation of the sleeve mechanism;

[0021] (3) Install the ratchet mechanism on the square shaft, connect one end of the dynamic torque sensor to the sleeve mechanism, and connect the other end of the dynamic torque sensor to the ratchet mechanism;

[0022] (4) Start the speed regulating motor. The torque of the speed regulating motor is transmitted to the ratchet mechanism through the reduction mechanism, the impact mechanism and the square shaft. The power output by the square shaft will drive the rotating rod to rotate 360 ​​degrees. Because the slider is always in the slide groove, the 360-degree rotation of the slider will drive the swing rod to swing left and right within a certain angle, and the fan gear will swing accordingly, which will drive the swing gear to alternately rotate forward and reverse. When the swing gear rotates forward, it drives the ratchet to rotate forward. The pawl will not get stuck on the ratchet, the pawl will not rotate, and the turntable will remain stationary. At this time, the nut will not rotate. When the swing gear rotates forward to the end and starts to reverse, the pawl is stuck on the ratchet. The ratchet continues to rotate, pushing the pawl and the turntable fixed to the pawl to rotate, thereby driving the sleeve mechanism to rotate, tightening the nut, and slowly outputting torque until the dynamic torque sensor detects the set torque and controls the speed regulating motor to stop working, thereby achieving precise torque control.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] (1) The present invention adopts a speed-regulating motor as a power source, and the torque can be adjusted by adjusting the speed of the motor. The torque can also be adjusted by adjusting the transmission ratio of the reduction mechanism, thereby realizing the adjustable torque of the electric wrench. In addition, the multi-stage reduction structure of the reduction mechanism can provide a greater torque output;

[0025] (2) In order to achieve accurate torque output, the present invention also provides a ratchet mechanism. When installing a nut with high torque requirements, the ratchet mechanism is installed on the square shaft. The power output by the square shaft will drive the rotating rod to rotate 360 ​​degrees. Since the slider is always in the slide groove, the 360-degree rotation of the slider will drive the swing rod to swing left and right within a certain angle, and the fan gear will swing accordingly, which will drive the swing gear to alternately rotate forward and reverse. When the swing gear rotates forward, driving the ratchet to rotate forward, the pawl will not get stuck on the ratchet, the pawl will not rotate, and the turntable will also remain stationary. At this time, the nut will not rotate. When the swing gear rotates forward to the end and starts to reverse, the pawl is stuck on the ratchet. The ratchet continues to rotate, which will push the pawl and the turntable fixedly connected to the pawl to rotate, thereby driving the sleeve to rotate, tightening the nut, and slowly outputting torque, thereby achieving accurate torque control;

[0026] (3) The sleeve mechanism of the present invention can be applied to nuts of different sizes. When in use, the inner sleeve is sleeved on the nut, and the driving gear is rotated. The driving gear rotates to drive the driven gear to rotate, and the synchronous gear coaxially fixedly connected to the driven gear rotates synchronously, which will simultaneously drive the six adjusting gears meshing with the synchronous gear to rotate. Since the adjusting gear is rotatably installed on the inner sleeve, the rotational motion of the adjusting gear will be converted into horizontal movement of the screw, thereby driving the six clips to be fixed on the nut. The displacement distances of the clips are different for nuts of different diameters, thereby completing the locking operation of nuts of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings in conjunction with embodiments:

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 It is a structural front view of the present invention;

[0030] Figure 3 The structure diagram of the swing assembly Figure 1 ;

[0031] Figure 4 The structure diagram of the swing assembly Figure 2 ;

[0032] Figure 5 Schematic diagram of the ratchet assembly Figure 1 ;

[0033] Figure 6 Schematic diagram of the ratchet assembly Figure 2 ;

[0034] Figure 7 Schematic diagram of the sleeve mechanism Figure 1 ;

[0035] Figure 8 Schematic diagram of the sleeve mechanism Figure 2 ;

[0036] Fig. 9 The schematic diagram of the structure of the sleeve mechanism without the top of the outer sleeve;

[0037] Fig.10 The schematic diagram of the structure of the sleeve mechanism without the top of the outer sleeve and the synchronous gear;

[0038] Fig.11 The structure diagram of the reduction mechanism Figure 1 ;

[0039] Fig.12 The structure diagram of the reduction mechanism Figure 2 .

[0040] In the figure: plastic shell 1; head shell 2; speed regulating motor 3; reduction mechanism 4; transmission shaft 41; sliding gear assembly 42; gear shaft 421; gear seat 422; first gear 423; second gear 424; third gear 425; driven gear assembly 43; primary gear 431; intermediate gear 432; primary gear shaft 433; secondary gear 434; secondary gear shaft 435; planetary gear set 436; clutch assembly 44; clutch motor 441; screw rod 442; screw rod nut seat 443; impact mechanism 5; square shaft 6; ratchet mechanism 7; ratchet box 71; handle 711; pendulum Driving assembly 72; driving shaft 721; rotating rod 722; sliding block 7221; swing rod 723; sliding groove 7231; swing shaft 724; sector gear 725; swing gear 726; ratchet assembly 73; ratchet shaft 731; ratchet 732; pawl 733; spring 734; connecting shaft 735; turntable 736; sleeve mechanism 8; sleeve mechanism 8; outer sleeve 81; joint 811; notch 812; inner sleeve 82; connecting bracket 83; clip 84; screw 85; adjusting gear 86; synchronous gear 87; driven gear 88; driving gear 89; dynamic torque sensor 9. DETAILED DESCRIPTION

[0041] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments:

[0042] Embodiment 1: Figure 1-12 As shown, an electric wrench torque control device comprises a speed regulating motor 3 for generating torque, a speed reduction mechanism 4 for adjusting the torque, a ratchet mechanism 7 for slowly applying torque to accurately control the torque, and a sleeve mechanism 8 for outputting a torque locking nut, wherein the ratchet mechanism 7 is connected to the speed regulating motor 3 via the speed reduction mechanism 4, and the sleeve mechanism 8 is mounted on the ratchet mechanism 7;

[0043] The ratchet mechanism 7 includes a ratchet box 71, a swing assembly 72 and a ratchet assembly 73. The ratchet box 71 is provided with a handle 711 for holding. The swing assembly 72 and the ratchet assembly 73 are both arranged in the ratchet box 71. The swing assembly 72 is transmission-connected to the reduction mechanism 4. The ratchet assembly 73 is transmission-connected to the swing assembly 72 so that the ratchet assembly 73 can be driven by the swing assembly 72 to rotate forward and reversely. The sleeve mechanism 8 is installed on the ratchet assembly 73 so that the ratchet assembly 73 can drive the sleeve mechanism 8 to rotate unidirectionally to tighten the bolts and nuts.

[0044] In this embodiment, in order to slowly and stably output torque to achieve the purpose of accurately controlling torque; the swing assembly 72 includes a drive shaft 721, a rotating rod 722, a swing rod 723, a swing shaft 724, a fan gear 725 and a swing gear 726. The drive shaft 721 is rotatably installed in the ratchet box 71, one end of the drive shaft 721 is transmission-connected to the reduction mechanism 4, the other end of the drive shaft 721 is fixedly connected to one end of the rotating rod 722, the other end of the rotating rod 722 is provided with a slider 7221, the swing shaft 724 is rotatably installed in the ratchet box 71, and one end of the swing rod 723 is fixedly installed on the swing On the driving shaft 724, a slide groove 7231 is provided on the swing rod 723, the slider 7221 is slidably installed on the slide groove 7231 so that the swing rod 723 can be driven to swing by the rotating rod 722, the fan gear 725 is coaxially fixedly installed on the swing shaft 724 so as to swing with the swing rod 723, the swing gear 726 is rotatably installed in the ratchet box 71, and the swing gear 726 is meshed with the fan gear 725 so that the swing gear 726 is driven to rotate forward and reverse through the back and forth swing of the fan gear 725, and the swing gear 726 is coaxially fixedly connected with the ratchet assembly 73 to drive the ratchet assembly 73 to rotate forward and reverse.

[0045] In this embodiment, in order to realize the swing assembly 72 to swing back and forth once, the ratchet mechanism 7 rotates a unit amount and slowly outputs torque; the ratchet assembly 73 includes a ratchet shaft 731, a ratchet wheel 732, a pawl 733, a spring 734 and a connecting shaft 735 for installing the sleeve mechanism 8, the ratchet shaft 731 is rotatably installed in the ratchet box 71, the ratchet wheel 732 and the swing gear 726 are coaxially fixedly installed on the ratchet shaft 731, and a rotating shaft 731 is rotatably installed on the ratchet shaft 731 through a bearing. Disc 736, one end of the pawl 733 is rotatably mounted on the turntable 736, the other end of the pawl 733 is arranged beside the ratchet 732, one end of the spring 734 is mounted on one side of the pawl 733, the other end of the spring 734 is mounted on the turntable 736 and is located on the other side of the pawl 733, the connecting shaft 735 is rotatably mounted on the ratchet box 71, one end of the connecting shaft 735 is coaxially fixedly connected to the turntable 736, and the other end of the connecting shaft 735 is connected to the sleeve mechanism 8 via the dynamic torque sensor 9.

[0046] In this embodiment, in order to adapt to nuts of different sizes; the sleeve mechanism 8 includes an outer sleeve 81 and an inner sleeve 82, the outer sleeve 81 is mounted on the ratchet mechanism 7, the inner sleeve 82 is fixedly mounted in the outer sleeve 81 through a connecting bracket 83, six clips 84 for forming hexagonal holes are evenly distributed in the inner sleeve 82, the six clips 84 are radially slidably mounted on the inner sleeve 82, and the outer sleeve 81 is provided with an adjustment component for driving the six clips 84 to slide radially so as to adapt to bolts and nuts of different diameters by adjusting the spacing between the clips 84;

[0047] The adjustment assembly includes six screws 85 evenly distributed in the inner sleeve 82 and an adjustment gear 86 threadedly installed on the outside of the screws 85. The six screws 85 are radially slidably installed on the inner sleeve 82. The screws 85 are radially recessed inward to form a sliding groove. The inner sleeve 82 is provided with a limiting rib for embedding in the sliding groove to lock the rotation of the screws 85. The clip 84 is installed on the inner side of the screw 85. The adjustment gear 86 is rotatably installed on the inner sleeve 82 through a bearing so that the screw 85 can be driven to slide radially in the inner sleeve 82 by rotating the adjusting gear 86.

[0048] In this embodiment, in order to drive the six adjusting gears 86 to rotate synchronously, and then drive the six screw rods 85 to move synchronously to change the spacing between the clips 84; the sleeve mechanism 8 also includes a synchronization component for synchronously driving the six screw rods 85 to slide, and the synchronization component includes a synchronization gear 87, a driven gear 88 and a driving gear 89. A synchronization shaft is rotatably installed between the inner sleeve 82 and the outer sleeve 81, and the synchronization gear 87 is coaxially fixedly installed on the lower side of the synchronization shaft. The synchronization gear 87 is simultaneously engaged with the six adjusting gears 86 so that the six adjusting gears 86 are driven to rotate synchronously through the rotation of the synchronization gear 87;

[0049] The driven gear 88 is coaxially fixedly installed on the upper side of the synchronous shaft, the driving gear 89 is rotatably installed on the outer sleeve 81 and the driving gear 89 is meshed with the driven gear 88 to drive the synchronous shaft to rotate and then drive the synchronous gear 87 to rotate. The upper side of the outer sleeve 81 is provided with an axially upwardly protruding joint 811, and the joint 811 is provided with a square hole for embedding the square shaft 6, and the joint 811 is provided with a notch 812 for the driving gear 89 to mesh with the driven gear 88.

[0050] In this embodiment, in order to transmit torque to the sleeve mechanism 8; the electric wrench torque control device also includes a plastic shell 1, a head shell 2, an impact mechanism 5 and a square shaft 6, the head shell 2 is installed on the front side of the plastic shell 1, the speed regulating motor 3, the reduction mechanism 4, the impact mechanism 5 and the square shaft 6 are arranged in the plastic shell 1 from the inside to the outside, the reduction mechanism 4 includes a transmission shaft 41, a sliding gear assembly 42, a driven gear assembly 43 and a clutch assembly 44, one end of the transmission shaft 41 is connected to the speed regulating motor 3, and the other end of the transmission shaft 41 is connected to the sliding gear assembly 42, the sliding gear assembly 42 is slidably installed in the plastic shell 1, the driven gear assembly 43 is arranged on the side of the sliding gear assembly 42 so as to engage with the sliding gear assembly 42, and the clutch assembly 44 is connected to the sliding gear assembly 42 to drive the sliding gear assembly 42 to slide, thereby switching the meshing state of the sliding gear assembly 42 and the driven gear assembly 43.

[0051] In this embodiment, in order to provide a variety of transmission ratios to adjust the torque output of the electric wrench; the sliding gear assembly 42 includes a gear seat 422 and a gear shaft 421, the gear shaft 421 is rotatably mounted on the gear seat 422, one end of the gear shaft 421 is connected to the transmission shaft 41, the transmission shaft 41 is provided with a transmission key, the gear shaft 421 is provided with a transmission shaft 41 hole for inserting the transmission shaft 41 and a keyway for inserting the transmission key, the gear shaft 421 is provided with a first gear 423, a second gear 424 and a third gear 425 with different numbers of teeth along the axial direction of the gear shaft 421, the gear seat 422 is slidably mounted in the plastic housing 1, the clutch assembly 44 is connected to the gear seat 422 to drive the gear seat 422 to slide, thereby switching the first gear 423, the second gear 424 or the third gear 425 to engage with the driven gear 88 group.

[0052] In this embodiment, in order to form a multi-stage gear transmission mechanism to provide a larger torque output; the driven gear assembly 43 includes a primary gear 431, an intermediate gear 432, a primary gear shaft 421, a secondary gear 434, a secondary gear shaft 421 and a planetary gear set 436, the primary gear shaft 421 is rotatably mounted in the plastic housing 1 and is located next to the gear shaft 421, the primary gear 431 is coaxially fixedly mounted on the primary gear shaft 421 so as to mesh with the first gear 423, the second gear 424 or the third gear 425, the intermediate gear 432 is coaxially fixed on the primary gear shaft 421, the secondary gear shaft 421 is rotatably mounted in the plastic housing 1, the secondary gear 434 is coaxially fixed on the secondary gear shaft 421 and the secondary gear 434 meshes with the intermediate gear 432, the secondary gear shaft 421 is connected to the planetary gear set 436, and the planetary gear set 436 is connected to the impact mechanism 5.

[0053] In this embodiment, in order to drive the gear seat 422 to slide, so as to switch the first gear 423, the second gear 424 or the third gear 425 to mesh with the driven gear assembly 43; the clutch assembly 44 includes a clutch motor 441 and a clutch screw rod 442 group, the clutch motor 441 is installed in the plastic housing 1, the clutch screw rod 442 group includes a screw rod 442 and a screw nut 443 seat, the screw rod 442 is rotatably installed in the plastic housing 1, one end of the screw rod 442 is transmission-connected to the clutch motor 441, the screw nut 443 seat is transmission-installed on the screw rod 442, and the screw nut 443 seat is fixedly connected to the gear seat 422 to drive the gear seat 422 to reciprocate, thereby switching the first gear 423, the second gear 424 or the third gear 425 to mesh with the driven gear assembly 43.

[0054] Embodiment 2: A control method of an electric wrench torque control device, comprising the following steps:

[0055] (1) Before use, set the speed of the speed regulating motor 3 and the transmission ratio of the speed reduction mechanism 4 according to the nut to output the required torque;

[0056] (2) The inner sleeve 82 is put on the nut, and the driving gear 89 is rotated. The driving gear 89 rotates to drive the driven gear 88 to rotate, and the synchronous gear 87 coaxially fixedly connected to the driven gear 88 rotates synchronously, which will drive the six adjusting gears 86 meshing with the synchronous gear 87 to rotate. Since the adjusting gear 86 is rotatably installed on the inner sleeve 82, the rotational movement of the adjusting gear 86 will be converted into horizontal movement of the screw 85, thereby driving the six clips 84 to be fixed on the nut, and the installation of the sleeve mechanism 8 is completed;

[0057] (3) Install the ratchet mechanism 7 on the square shaft 6, connect one end of the dynamic torque sensor to the sleeve mechanism 8, and connect the other end of the dynamic torque sensor to the ratchet mechanism 7;

[0058] (4) Start the speed regulating motor 3. The torque of the speed regulating motor 3 is transmitted to the ratchet mechanism 7 through the reduction mechanism 4, the impact mechanism 5 and the square shaft 6. The power output by the square shaft 6 will drive the rotating rod 722 to rotate 360 ​​degrees. Since the slider 7221 is always in the slide groove 7231, the 360-degree rotation of the slider 7221 will drive the swing rod 723 to swing left and right within a certain angle, and the fan gear 725 will swing accordingly, which will in turn drive the swing gear 726 to alternately rotate forward and reverse. When the swing gear 726 rotates forward, it drives the ratchet 732 to rotate forward, and the ratchet pawl 733 does not rotate. The ratchet 732 will be stuck, the pawl 733 will not rotate, and the turntable 736 will also remain stationary. At this time, the nut will not rotate. When the swing gear 726 rotates to the end and starts to reverse, the pawl 733 will be stuck on the ratchet 732. The ratchet 732 continues to rotate, which will push the pawl 733 and the turntable 736 fixedly connected to the pawl 733 to rotate, thereby driving the sleeve mechanism 8 to rotate, tightening the nut, and slowly outputting the torque until the dynamic torque sensor detects the set torque and controls the speed control motor 3 to stop working, thereby achieving precise control of the torque.

[0059] Specific implementation process: When in use, according to the installation requirements, adjust the speed of the speed regulating motor 3, and start the clutch motor 441 to select the transmission ratio of the reduction mechanism 4. After adjustment, put the inner sleeve 82 on the nut, rotate the driving gear 89, and the driving gear 89 rotates to drive the driven gear 88 to rotate. The synchronous gear 87 coaxially fixedly connected to the driven gear 88 rotates synchronously, which will drive the six adjusting gears 86 meshing with the synchronous gear 87 to rotate. Since the adjusting gear 86 is rotatably installed on the inner sleeve 82, the rotational movement of the adjusting gear 86 will be converted into the horizontal movement of the screw 85, and then drive the six clips 84 to be fixed on the nut. The displacement distances of the clips 84 are different for nuts of different diameters, thereby completing the locking operation of nuts of various sizes;

[0060] After the installation is completed, the speed regulating motor 3 is driven, and the torque of the speed regulating motor 3 is transmitted to the tool head through the reduction mechanism 4, the impact mechanism 5 and the square shaft 6 to control the rotation of the nut or screw to complete the installation. If a nut with a high torque requirement needs to be installed, the ratchet mechanism 7 is installed on the square shaft 6. The power output by the square shaft 6 will drive the rotating rod 722 to rotate 360 ​​degrees. Because the slider 7221 is always in the slide groove 7231, the 360-degree rotation of the slider 7221 will drive the swing rod 723 to swing left and right within a certain angle, and the fan gear 725 will swing accordingly, which will drive the swing rod 723 to rotate 360 ​​degrees. The movable gear 726 rotates forward and reverse alternately. When the swing gear 726 rotates forward, it drives the ratchet 732 to rotate forward. The pawl 733 will not get stuck on the ratchet 732, the pawl 733 will not rotate, and the turntable 736 also remains stationary. At this time, the nut does not rotate. When the swing gear 726 rotates forward to the end and starts to reverse, the pawl 733 is stuck on the ratchet 732. The ratchet 732 continues to rotate, which will push the pawl 733 and the turntable 736 fixedly connected to the pawl 733 to rotate, thereby driving the sleeve to rotate, tighten the nut, and slowly output torque, thereby achieving precise control of torque.

[0061] The above descriptions are merely embodiments of the present invention, and are not intended to limit the scope of patent protection of the invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the scope of patent protection of the present invention.

Claims

1. An electric wrench torque control device, characterized in that: It includes a speed regulating motor for generating torque, a speed reduction mechanism for adjusting the torque, a ratchet mechanism for slowly applying torque to accurately control the torque, and a sleeve mechanism for outputting a torque locking nut, wherein the ratchet mechanism is connected to the speed regulating motor via the speed reduction mechanism, and the sleeve mechanism is mounted on the ratchet mechanism; The ratchet mechanism includes a ratchet box, a swing assembly and a ratchet assembly. The ratchet box is provided with a handle for holding. The swing assembly and the ratchet assembly are both arranged in the ratchet box. The swing assembly is transmission-connected with the reduction mechanism. The ratchet assembly is transmission-connected with the swing assembly so that the swing assembly can drive the ratchet assembly to rotate forward and reversely. The sleeve mechanism is installed on the ratchet assembly so that the ratchet assembly can drive the sleeve mechanism to rotate unidirectionally to tighten the bolts and nuts.

2. The electric wrench torque control device according to claim 1, characterized in that: The swing assembly comprises a driving shaft, a rotating rod, a swing rod, a swing shaft, a fan gear and a swing gear. The driving shaft is rotatably installed in the ratchet box, one end of the driving shaft is transmission-connected to the reduction mechanism, and the other end of the driving shaft is fixedly connected to one end of the rotating rod. The other end of the rotating rod is provided with a slider. The swing shaft is rotatably installed in the ratchet box, one end of the swing rod is fixedly installed on the swing shaft, the swing rod is provided with a slide groove, and the slider is slidably installed on the slide groove so that the swing rod can be driven to swing by the rotation of the rotating rod. The fan gear is coaxially fixedly installed on the swing shaft so as to swing with the swing rod. The swing gear is rotatably installed in the ratchet box, and the swing gear is meshed with the fan gear so as to drive the swing gear to be forward and reversed through the back and forth swing of the fan gear. The swing gear is coaxially fixedly connected with the ratchet assembly to drive the ratchet assembly to be forward and reverse.

3. The electric wrench torque control device according to claim 2, characterized in that: The ratchet assembly includes a ratchet shaft, a ratchet, a pawl, a spring and a connecting shaft for installing a sleeve mechanism, the ratchet shaft is rotatably installed in a ratchet box, the ratchet and the swing gear are coaxially fixedly installed on the ratchet shaft, and a turntable is rotatably installed on the ratchet shaft through a bearing, one end of the pawl is rotatably installed on the turntable, and the other end of the pawl is arranged beside the ratchet, one end of the spring is installed on one side of the pawl, and the other end of the spring is installed on the turntable and located on the other side of the pawl, the connecting shaft is rotatably installed on the ratchet box, one end of the connecting shaft is coaxially fixedly connected to the turntable, and the other end of the connecting shaft is connected to the sleeve mechanism via a dynamic torque sensor.

4. The electric wrench torque control device according to claim 1, characterized in that: The sleeve mechanism comprises an outer sleeve and an inner sleeve, the outer sleeve is mounted on the ratchet mechanism, the inner sleeve is fixedly mounted in the outer sleeve through a connecting bracket, six clips for forming inner hexagonal holes are evenly distributed in the inner sleeve, the six clips are radially slidably mounted on the inner sleeve, and an adjustment component for driving the six clips to slide radially is provided on the outer sleeve so as to adapt to bolts and nuts of different diameters by adjusting the spacing between the clips; The adjusting assembly includes six screws evenly distributed in the inner sleeve and an adjusting gear threadedly mounted on the outside of the screws. The six screws are radially slidably mounted on the inner sleeve. A sliding groove is formed on the screws which is radially recessed inward. The inner sleeve is provided with a limiting rib for embedding in the sliding groove to lock the rotation of the screw. The clip is mounted on the inner side of the screw. The adjusting gear is rotatably mounted on the inner sleeve through a bearing so that the screw can be driven to slide radially in the inner sleeve by rotating the adjusting gear.

5. The electric wrench torque control device according to claim 4, characterized in that: The sleeve mechanism also includes a synchronization component for synchronously driving the six screws to slide, the synchronization component includes a synchronization gear, a driven gear and a driving gear, a synchronization shaft is rotatably installed between the inner sleeve and the outer sleeve, the synchronization gear is coaxially fixedly installed on the lower side of the synchronization shaft, and the synchronization gear is simultaneously engaged with the six adjustment gears so that the six adjustment gears are driven to rotate synchronously through the rotation of the synchronization gear; The driven gear is coaxially fixedly installed on the upper side of the synchronous shaft, the driving gear is rotatably installed on the outer sleeve and the driving gear is meshed with the driven gear to drive the synchronous shaft to rotate and then drive the synchronous gear to rotate. The upper side of the outer sleeve is provided with an axially upwardly protruding joint, and the joint is provided with a notch for the driving gear to mesh with the driven gear.

6. The electric wrench torque control device according to claim 1, characterized in that: The electric wrench torque control device also includes a plastic shell, a head shell, an impact mechanism and a square shaft, the head shell is installed on the front side of the plastic shell, the speed regulating motor, the reduction mechanism, the impact mechanism and the square shaft are arranged in the plastic shell from the inside to the outside, the reduction mechanism includes a transmission shaft, a sliding gear assembly, a driven gear assembly and a clutch assembly, one end of the transmission shaft is connected to the speed regulating motor, the other end of the transmission shaft is connected to the sliding gear assembly, the sliding gear assembly is slidably installed in the plastic shell, the driven gear assembly is arranged on the side of the sliding gear assembly so as to mesh with the sliding gear assembly, and the clutch assembly is connected to the sliding gear assembly to drive the sliding gear assembly to slide, thereby switching the meshing state of the sliding gear assembly and the driven gear assembly.

7. The electric wrench torque control device according to claim 1, characterized in that: The sliding gear assembly includes a gear seat and a gear shaft, the gear shaft is rotatably mounted on the gear seat, one end of the gear shaft is connected to the transmission shaft, a transmission key is provided on the transmission shaft, a transmission shaft hole for inserting the transmission shaft and a keyway for inserting the transmission key are provided in the gear shaft, a first gear, a second gear and a third gear with different numbers of teeth are provided on the gear shaft along the axial direction of the gear shaft, the gear seat is slidably mounted in a plastic housing, and the clutch assembly is connected to the gear seat to drive the gear seat to slide so as to switch the first gear, the second gear or the third gear to mesh with the driven gear set.

8. The electric wrench torque control device according to claim 7, characterized in that: The driven gear assembly includes a primary gear, an intermediate gear, a primary gear shaft, a secondary gear, a secondary gear shaft and a planetary gear set. The primary gear shaft is rotatably mounted in a plastic housing and is located beside the gear shaft. The primary gear is coaxially fixed on the primary gear shaft so as to mesh with the first gear, the second gear or the third gear. The intermediate gear is coaxially fixed on the primary gear shaft. The secondary gear shaft is rotatably mounted in the plastic housing. The secondary gear is coaxially fixed on the secondary gear shaft and the secondary gear meshes with the intermediate gear. The secondary gear shaft is connected to the planetary gear set, and the planetary gear set is connected to the impact mechanism.

9. The electric wrench torque control device according to claim 7, characterized in that: The clutch assembly includes a clutch motor and a clutch screw group, the clutch motor is installed in a plastic housing, the clutch screw group includes a screw and a screw nut seat, the screw is rotatably installed in the plastic housing, one end of the screw is transmission-connected to the clutch motor, the screw nut seat is transmission-connected on the screw, and the screw nut seat is fixedly connected to the gear seat to drive the gear seat to reciprocate so as to switch the first gear, the second gear or the third gear to mesh with the driven gear assembly.

10. A control method for the electric wrench torque control device according to any one of claims 1 to 9, characterized in that: The following steps are involved: (1) Before use, set the speed of the speed regulating motor and the transmission ratio of the speed reduction mechanism according to the nut to output the required torque; (2) Put the inner sleeve on the nut and rotate the driving gear. The driving gear rotates to drive the driven gear to rotate. The synchronous gear coaxially connected to the driven gear rotates synchronously, which will drive the six adjusting gears meshing with the synchronous gear to rotate. Since the adjusting gear is installed on the inner sleeve, the rotational motion of the adjusting gear will be converted into horizontal movement of the screw, which in turn drives the six clips to be fixed on the nut, completing the installation of the sleeve mechanism; (3) Install the ratchet mechanism on the square shaft, connect one end of the dynamic torque sensor to the sleeve mechanism, and connect the other end of the dynamic torque sensor to the ratchet mechanism; (4) Start the speed regulating motor. The torque of the speed regulating motor is transmitted to the ratchet mechanism through the reduction mechanism, the impact mechanism and the square shaft. The power output by the square shaft will drive the rotating rod to rotate 360 ​​degrees. Because the slider is always in the slide groove, the 360-degree rotation of the slider will drive the swing rod to swing left and right within a certain angle, and the fan gear will swing accordingly, which will drive the swing gear to alternately rotate forward and reverse. When the swing gear rotates forward, it drives the ratchet to rotate forward. The pawl will not get stuck on the ratchet, the pawl will not rotate, and the turntable will remain stationary. At this time, the nut will not rotate. When the swing gear rotates forward to the end and starts to reverse, the pawl is stuck on the ratchet. The ratchet continues to rotate, pushing the pawl and the turntable fixed to the pawl to rotate, thereby driving the sleeve mechanism to rotate, tightening the nut, and slowly outputting torque until the dynamic torque sensor detects the set torque and controls the speed regulating motor to stop working, thereby achieving precise torque control.

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