Electric screwdriver

Abstract

The utility model provides a kind of electric screwdriver, including seat, electric driver, screw supply nozzle, driving mechanism and control circuit board, electric driver is set on seat, screw supply nozzle has guide through-hole and supply through-hole, the pivot of electric driver is slidably inserted into guide through-hole;Supply through-hole is communicated with guide through-hole;Driving mechanism is set on seat and drives screw supply nozzle to move along the central axis direction of the pivot of electric driver;Driving mechanism includes motor, gear and rack, motor is installed on seat, control circuit board is electrically connected with motor and electric driver;Gear is connected with the output end of motor, gear is engaged with rack;Rack is arranged in parallel with the central axis of pivot and one end is connected with screw supply nozzle.The utility model drives screw using motor, need not to adopt driving cylinder drive, avoid the problem that the equipment volume is big, driving unstable caused by using gas supply equipment to carry gas, and the speed of driving screw is fast, work is stable, effectively improve production efficiency.

Description

Technical Field

[0001] This utility model relates to screw-driving tools, and more particularly to electric screwdrivers. Background Technology

[0002] Existing electric screwdrivers generally include an electric screwdriver, a screw feed nozzle, and a cylinder. The screw feed nozzle slides onto the shaft of the electric screwdriver. When a screw enters the nozzle, the cylinder drives the nozzle downwards, causing the shaft to leave the feed port of the nozzle, allowing the screw to enter the nozzle's outlet. The cylinder then drives the nozzle upwards, causing the shaft to re-enter the nozzle and eject the screw from the outlet, thus enabling the screwdriver to drive the screw. However, because existing electric screwdrivers use a cylinder as the screw feed driver, the cylinder requires a high-pressure gas supply. This high-pressure gas is either provided by a high-pressure gas tank or an air compressor, but these high-pressure gas supply devices are very bulky, occupying a significant amount of production space. Furthermore, using gas to drive the cylinder's extension and retraction is slow, and controlling the gas pressure stability is difficult, resulting in unstable driving and low sensitivity. This leads to long single screw driving times and low production efficiency. Utility Model Content

[0003] The purpose of this invention is to provide an electric screwdriver that uses a motor to drive screws, eliminating the need for a drive cylinder and avoiding the problems of large equipment size and unstable drive caused by using an air supply device. It can screw fast, work stably, and effectively improve production efficiency.

[0004] To achieve the above objectives, this utility model provides an electric screwdriver comprising a base, an electric screwdriver, a screw feed nozzle, a drive mechanism, and a control circuit board. The electric screwdriver is mounted on the base. The screw feed nozzle has a guide hole and a feed hole. The shaft of the electric screwdriver is slidably and telescopically inserted into the guide hole. The feed hole communicates with the guide hole to allow screws to be fed from the feed hole to the outlet of the guide hole. The drive mechanism is mounted on the base and drives the screw feed nozzle to move along the central axis of the shaft of the electric screwdriver. The drive mechanism includes a motor, a gear, and a rack. The motor is mounted on the base. The control circuit board is electrically connected to the motor and the electric screwdriver to control the motor and the electric screwdriver. The gear is connected to the output end of the motor and meshes with the rack. The rack is arranged parallel to the central axis of the shaft and one end is connected to the screw feed nozzle to drive the screw feed nozzle to slide, thereby outputting screws one by one from the outlet.

[0005] Compared with existing technologies, this utility model utilizes a rack and pinion connected to a screw feed nozzle, with a gear meshing with the rack and pinion for drive. The gear is then driven to rotate by a motor, allowing the screw feed nozzle to move linearly via the motor, thus achieving the screw-driving action on the electric screwdriver. The use of a motor for electric control eliminates the need for cylinders and air supply equipment, significantly reducing the size of the equipment. Furthermore, the electric drive is highly stable, and the motor's response is sensitive, resulting in a highly flexible and rapid screw-driving action, greatly increasing screw-driving speed and significantly improving production efficiency.

[0006] Preferably, the drive mechanism further includes a reduction mechanism connected between the output end of the motor and the gear. The reduction mechanism reduces the output speed of the motor, thereby providing a suitable movement speed for the screw feed nozzle.

[0007] Preferably, the electric screwdriver further includes a stroke controller, which includes a drive circuit board, a Hall sensor, and a magnet. The drive circuit board is disposed on the base and extends parallel to the rack. The Hall sensor is disposed at the front, middle, and rear ends of the drive circuit board facing the rack. The magnet is disposed on one side of the rack. The Hall sensor controls the stroke of the rack by sensing the position of the magnet. By distributing Hall sensors at the front, middle, and rear ends of the drive circuit board, the magnet can be sensed at these three points, thereby controlling the stroke of the rack. This allows control over the distance the screwdriver's shaft extends beyond the screw feed nozzle, thus controlling the length of the screw extension. When the screw is made of a magnetically attracted material such as iron or steel, the screw can be completely pushed out of the screw feed nozzle by the screwdriver's shaft, where the magnet at the end of the shaft holds the screw in place, preventing it from falling and facilitating screw driving. When the screw is made of a non-magnetic material such as aluminum, part of the screw can be pushed out of the screw feed nozzle by the shaft of the electric screwdriver, while the other part remains wrapped by the screw feed nozzle. This also prevents the screw from falling out and makes it easier to drive the screw.

[0008] Preferably, a connecting rod is connected to one end of the rack near the screw feed nozzle, and the other end of the connecting rod is connected to the screw feed nozzle.

[0009] Preferably, the base body is provided with a guide tube along a direction parallel to the central axis of the rotation shaft, and the rack is slidably disposed within the guide tube. The guide tube can guide the rack, making the movement of the rack more stable.

[0010] Preferably, the electric screwdriver is connected to a screw feeding device, and the screw feeding device and its output port are connected to the input port of the screw feeding nozzle via a flexible tube to feed screws to the screw feeding nozzle.

[0011] Specifically, the screw feeding device is a screw vibratory feeder, and the horizontal height of the output port of the screw vibratory feeder is greater than the horizontal height of the input port of the screw feeding nozzle, so that the screw is delivered from the output port of the screw vibratory feeder to the input port of the screw feeding nozzle under the action of gravity.

[0012] Specifically, the screw feeding device is an air-blowing screw feeder, which drives the screw to be fed to the input port of the screw feeding nozzle by blowing air into the hose.

[0013] Preferably, the electric screwdriver further includes a screw connector fixed to the base. When the screw feed nozzle slides to its upper limit of travel, it engages with the screw connector to receive screws output from it. By providing the screw connector, some screws can be temporarily stored within it. After the screw feed nozzle engages with the screw connector, it outputs a screw to the screw feed nozzle, allowing the screw feed nozzle to supply screws to the electric screwdriver again, thus achieving the purpose of continuous screw driving. The separate arrangement of the screw connector and the screw feed nozzle avoids the motor driving the entire screw feeding assembly up and down, reducing the weight of the screw feed nozzle and consequently reducing the load on the motor, which helps protect the motor and extends its service life.

[0014] Specifically, the screw connector includes a trigger switch. When the screw feed nozzle engages with the screw connector, it triggers the trigger switch, causing the trigger switch to release a screw from the screw connector to the screw feed nozzle. By setting the trigger switch, the screw feed nozzle can automatically release the screw each time it engages with the screw connector, eliminating the need for manual operation or program monitoring and control. The structure is very simple and easy to control, ensuring smooth screw delivery when the screw feed nozzle separates from or engages with the screw connector, thus improving operational stability. Attached Figure Description

[0015] Figure 1 This is a perspective view of the electric screwdriver connecting screw feeding device of this utility model.

[0016] Figure 2 This is a perspective view of the electric screwdriver of this utility model.

[0017] Figure 3 This is another perspective view of the electric screwdriver of this utility model.

[0018] Figure 4 This is an internal structural diagram of the drive mechanism of the electric screwdriver of this utility model.

[0019] Figure 5This is an exploded view of the drive mechanism of the electric screwdriver of this utility model.

[0020] Figure 6 This is a cross-sectional view of the screw feed nozzle and screw mating nozzle of the electric screwdriver of this utility model.

[0021] Figure 7 This is a cross-sectional view of the screw connector of the electric screwdriver of this utility model.

[0022] Figure 8 This is a structural diagram of the slider of the screw-connecting nozzle of the electric screwdriver of this utility model.

[0023] Figure 9 This is a structural diagram of the trigger drive mechanism of the trigger switch of the electric screwdriver of this utility model.

[0024] Figure 10 This is a diagram showing the screw-on state of the electric screwdriver of this utility model.

[0025] Figure 11 This is a diagram showing the state in which the rotating shaft of the electric screwdriver of this utility model pushes out the screw. Detailed Implementation

[0026] To explain in detail the technical content, structural features, objectives and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0027] Please see Figures 1 to 6 The electric screwdriver 100 of this utility model includes a base 1, an electric screwdriver 2, a screw feed nozzle 3, a drive mechanism 4, and a control circuit board 5. The electric screwdriver 2 is mounted on the base 1. After the electric screwdriver 2 is powered on, its shaft 21 rotates to output torque, thereby tightening the screw. The screw feed nozzle 3 has a guide hole 31 and a feed hole 32. The guide hole 31 extends through the upper and lower ends of the screw feed nozzle 3. The shaft 21 of the electric screwdriver 2 is slidably and telescopically inserted into the guide hole 31. The feed hole 32 is inclined relative to the guide hole 31; the outlet of one end of the feed hole 32 communicates with the guide hole 31, so that the screw is fed from the feed hole 32 to the outlet of the guide hole 31. The drive mechanism 4 is mounted on the base 1 and its output end is connected to the screw feed nozzle 3 to drive the screw feed nozzle 3 to move along the central axis of the rotating shaft 21 of the electric screwdriver 2. When the screw feed nozzle 3 moves downward, the end of the rotating shaft 21 leaves the outlet of the feed through hole 32, thereby causing the screw located in the feed through hole 32 to slide into the outlet of the guide through hole 31. When the screw feed nozzle 3 moves upward, the end of the rotating shaft 21 abuts against the screw head, thereby pushing the screw at the outlet, causing the screw to extend out of the outlet.

[0028] For example Figure 4 and Figure 5 As shown, the drive mechanism 4 includes a motor 41, a gear 42, and a rack 43. The motor 41 is mounted on the base 1. The control circuit board 5 is electrically connected to the motor 41 and the electric screwdriver 2 to control the motor 41 and the electric screwdriver 2. The gear 42 is connected to the output end of the motor 41 and meshes with the rack 43. The rack 43 is parallel to the central axis of the rotating shaft 21 and has a connecting rod 44 connected to one end via a threaded connection. The other end of the connecting rod 44 is connected to the connecting lug of the screw feed nozzle 3 via a threaded connection for easy assembly, thereby driving the screw feed nozzle 3 to slide and output screws one by one from the outlet. The drive mechanism 4 also includes a reduction mechanism 45, which is connected between the output end of the motor 41 and the gear 42. The reduction mechanism reduces the output speed of the motor 41, thereby providing a suitable movement speed for the screw feed nozzle 3. The reduction mechanism 45 is a reduction gear set. The structure of the reduction gear set is common knowledge and will not be described in detail here.

[0029] Please see again Figure 5The electric screwdriver 100 also includes a stroke controller 6, which includes a drive circuit board 61, Hall effect sensors 62, and a magnet 63. The drive circuit board 61 is disposed on the base 1 and electrically connected to the control circuit board 5, and its extension direction is parallel to the rack 43. There are three Hall effect sensors 62, respectively disposed at the front, middle, and rear ends of the drive circuit board 61 facing the rack 43. The magnet 63 is disposed on one side of the rack 43. Each Hall effect sensor 62 senses the position of the magnet 63 and controls the start and stop of the motor 41 via the control circuit board 5, thereby controlling the stroke of the rack 43. By distributing Hall effect sensors 62 at the front, middle, and rear ends of the drive circuit board 61, the magnet 63 can be sensed at these three points, thereby controlling the stroke of the rack 43. This allows control over the distance the shaft 21 of the electric screwdriver 2 extends beyond the screw feed nozzle 3, thus controlling the length of the screw extension. When the screw is made of a magnetically attractive material such as iron or steel, two Hall effect sensors 62 located at the front and rear ends of the drive circuit board 61 can be used to sense the magnet 63, thereby controlling the rack 43 to move to its maximum stroke. This allows the screw to be completely ejected from the screw feed nozzle 3 via the shaft 21 of the electric screwdriver 2. The screw is then held in place by a magnet at the end of the shaft 21, preventing it from falling off and facilitating screw driving. Furthermore, to prevent the screw from detaching from the shaft 21 after being ejected, another magnet 3a is positioned near the outlet of the screw feed nozzle 3. This magnet 3a provides magnetic attraction to the screw, ensuring it doesn't detach from the lower end of the shaft 21. When the screw is made of a non-magnetically attracted material such as aluminum, two Hall effect sensors 62 located at the front and middle of the drive circuit board 61 can be set to sense the magnet 63, thereby controlling the rack 43 to move only half of its maximum stroke. This allows part of the screw to be pushed out of the screw feed nozzle 3 by the shaft 21 of the electric screwdriver 2, while the other part continues to be wrapped by the screw feed nozzle 3. This also prevents the screw from falling out and makes it easier to drive the screw.

[0030] Please see again Figure 5 The base 1 is provided with a guide tube 11 along a direction parallel to the central axis of the rotating shaft 21, and the rack 43 and the connecting rod 44 are both slidably disposed within the guide tube 11. The guide tube 11 can guide the rack 43, making the movement of the rack 43 more stable.

[0031] For example Figure 1As shown, the electric screwdriver 100 is connected to the screw feeding device 200. The screw feeding device 200 is connected to the screw feeding nozzle 3 via a hose 101, which feeds screws to the screw feeding nozzle 3. The inner diameter of the hose 101 is larger than the screw head diameter, allowing only one screw to pass through at a time. Specifically, in this embodiment, the screw feeding device 200 is a screw vibratory feeder. The horizontal height of the output port of the vibratory feeder is greater than the horizontal height of the input port of the screw feeding nozzle 3, so that the screw is fed from the output port of the vibratory feeder to the input port of the screw feeding nozzle 3 under gravity. This eliminates the need for high-pressure gas to be blown onto the screw feeding nozzle 3 during screw feeding, thus eliminating the need for an air supply device and significantly reducing the size of the equipment. Of course, the screw feeding device 200 can also be a blow-type screw feeder, which can drive the screw to the input port of the screw feeding nozzle 3 by blowing air into the hose 101.

[0032] Please see Figure 3 , Figure 4 and Figure 6 The electric screwdriver 100 also includes a screw connector 7, which is separable from the screw feed nozzle 3. The screw connector 7 is fixed to the base 1. When the screw feed nozzle 3 slides to the upper limit of its stroke, it engages with the screw connector 7 to receive screws output from the screw connector 7. By setting the screw connector 7, some screws can be temporarily stored in the screw connector 7. When the screw feed nozzle 3 engages with the screw connector 7, the screw connector 7 outputs a screw to the screw feed nozzle 3, so that the screw feed nozzle 3 can supply screws to the electric screwdriver 2 again, achieving the purpose of connecting and screwing. The screw connector 7 and the screw feed nozzle 3 are separately set, which can avoid the motor 41 driving the entire screw feeding assembly to move up and down, and also avoid pulling the hose 101 during up and down movement, thereby reducing the weight of the screw feed nozzle 3, and thus reducing the load on the motor 41, which is beneficial to protecting the motor 41 and extending the service life of the motor 41.

[0033] Please see again Figure 6 and Figure 7The screw connector 7 includes a trigger switch 71. When the screw feed nozzle 3 engages with the screw connector 7, it triggers the trigger switch 71, causing the trigger switch 71 to release a screw from the screw connector 7, allowing the screw to be fed to the screw feed nozzle 3. Specifically, the screw connector 7 has a feed channel 72, which is inclined relative to the guide hole 31. When the screw feed nozzle 3 engages with the screw connector 7, one end of the feed hole 32 is connected to the feed channel 72, and the other end of the feed channel 72 is connected to the flexible hose 101 for conveying the screw. The trigger switch 71 can block or release the screw in the feed channel 72. By setting the trigger switch 71, the screw feeding nozzle 3 can automatically release the screw each time it is connected to the screw docking nozzle 7. No manual operation or program monitoring and control is required. The structure is very simple and easy to control. This ensures that the screw feeding nozzle 3 can smoothly deliver screws when it is separated or connected to the screw docking nozzle 7, thus improving the stability of operation.

[0034] For example Figure 7 and Figure 8As shown, the trigger switch 71 includes a mounting base 711 and a first trigger mechanism 712. The mounting base 711 is connected to the base body 1, and the first trigger mechanism 712 is disposed on the mounting base 711 to block or release the screw. The first trigger mechanism 712 includes a slider 7121, a first elastic element 7122, and a first roller 7123. The slider 7121 is slidably disposed on the mounting base 711 along the radial direction of the feed channel 72. The first elastic element 7122 is disposed between the slider 7121 and the mounting base 711 to provide an elastic force that allows one end of the slider 7121 to extend into the feed channel 72 through an opening, thereby blocking the screw. The first elastic element 7122 is a compression spring. By configuring the slider 7121 and the first elastic element 7122, the first elastic element 7122 resets the slider 7121, allowing it to automatically block the screw. Triggering the slider 7121 to slide releases the screw, thus cooperating with the screw feed nozzle 3 to achieve automatic screw feeding. The slider 7121 has a connecting portion 7121a and a ring portion 7121b. The connecting portion 7121a is connected to the outside of the ring portion 7121b, which is fitted over the feed channel 72. The inner side of the ring portion 7121b, away from the connecting portion 7121a, has an inwardly protruding protrusion 7121c. This protrusion 7121c extends into the feed channel 72 under the action of the first elastic element. The first roller 7123 is pivotally connected to the end of the connecting portion 7121a away from the ring portion 7121b, allowing it to roll upon triggering. This allows the connecting part 7121a to form a rolling contact during triggering, thereby reducing frictional resistance and improving the smoothness of triggering.

[0035] For example Figure 7As shown, the trigger switch 71 further includes a second trigger mechanism 713, which is disposed on the mounting base 711. The second trigger mechanism 713 is located in front of the first trigger mechanism 712 in the conveying direction of the material channel 72, i.e., on the side away from the outlet of the material channel 72, so as to block other screws in front of the first screw when the first trigger mechanism 712 releases the first screw. The second trigger mechanism 713 includes a sliding member 7131, a second elastic element 7132, and a second roller 7133. The sliding member 7131 is slidably disposed on the mounting base 711 along the radial direction of the material channel 72. The second elastic element 7132 is disposed between the sliding member 7131 and the mounting base 711 to provide an elastic force that causes one end of the sliding member 7131 to exit the material channel 72 and thus release the screw; the second elastic element 7132 is a compression spring. By configuring the slider 7131 and the second elastic element 7132, the second elastic element 7132 resets the slider 7131, allowing it to automatically release the screw. Conversely, triggering the slider 7131 to slide automatically blocks the screw, thus cooperating with the first triggering mechanism 712 to automatically feed a screw. The second roller 7133 is located at the end of the slider 7131 away from the feed channel 72, allowing it to roll during triggering. This creates rolling contact during triggering, reducing frictional resistance and improving triggering smoothness.

[0036] Please see Figure 6 , Figure 7 and Figure 9The trigger switch 71 further includes a trigger drive mechanism 73, which includes a trigger rod 731, a reset element 732, a drive gear 733, and a drive rod 734. The trigger rod 731 and the drive rod 734 are arranged in parallel and slidably disposed within each slide tube inside the mounting base 711, with the sliding direction parallel to the central axis of the rotating shaft 21. When the screw feed nozzle 3 mates with the screw mating nozzle 7, the screw feed nozzle 3 pushes the trigger rod 731, causing the trigger rod 731 to retract into the screw mating nozzle 7. The reset element 732 is disposed between the trigger rod 731 and the mounting base 711, so that the trigger rod 731 extends toward the screw feed nozzle 3. The reset element 732 is a compression spring. The trigger rod 731 and the drive rod 734 are respectively provided with racks 731a and 734a on opposite sides, or multiple gear teeth are arranged axially to form a rack. The drive gear 733 meshes with the racks 731a of the trigger rod 731 and 734a of the drive rod 734. The drive rod 734 is provided with a protrusion 734b and a recess 734c from top to bottom on the side facing the first trigger mechanism 712 and the second trigger mechanism 713. When the protrusion 734b abuts against the second trigger mechanism 713 and the first trigger mechanism 712 in sequence, the second trigger mechanism 713 blocks all screws except the first screw below, and the first trigger mechanism 712 releases the first screw, allowing the first screw to enter the screw feed nozzle 3 from the screw docking nozzle 7. When the recess 734c sequentially contacts the first triggering mechanism 712 and the second triggering mechanism 713, the first triggering mechanism 712 blocks all screws; the second triggering mechanism 713 releases all screws, thus both releasing the screws in the hose 101 into the feed channel 72 and blocking all screws to prevent them from falling out of the feed channel 72. Since the screw connector 7 can only output one screw to the screw feed nozzle 3 at a time, other screws need to be intercepted at the screw connector 7. This requires first triggering the second triggering mechanism 713 to block the second screw, and then triggering the first triggering mechanism 712 to release the first screw. Therefore, the moving parts need to move from top to bottom. By setting the triggering drive mechanism 73, the driving force of the upward movement of the screw feed nozzle 3 can be converted into the driving force of the downward movement of the drive rod 734. This driving force is then used to trigger the second triggering mechanism 712 and the first triggering mechanism 713 sequentially to achieve the effect of feeding one screw, thereby avoiding jamming caused by feeding multiple screws simultaneously and ensuring operational stability.

[0037] In this embodiment, there are two trigger rods 731, two reset elements 732, and two drive gears 733. Each trigger rod 731, reset element 732, and drive gear 733 forms a drive assembly, and the two drive assemblies are respectively arranged on opposite sides of the drive rod 734. By setting two drive assemblies, the drive rod 734 can be subjected to balanced forces, thereby making the drive more stable.

[0038] In summary and in combination Figure 7 , Figure 10 and Figure 11 The working principle of the electric screwdriver 100 of this utility model will be explained in detail below:

[0039] First, before screwing, the screw feeding device 200 outputs a screw to the hose 101. Under the action of gravity, the screw falls along the hose 101 and enters the feed channel 72 of the screw docking nozzle 7. At this time, the second triggering mechanism 713 is not triggered, the sliding member 7131 is in the state of being withdrawn from the feed channel 72, and the first triggering mechanism 712 is also not triggered. The protrusion 7121c of the ring 7121b extends into the feed channel 72 to intercept the first screw, thereby intercepting all screws. One screw is temporarily stored in the feed through hole 32 of the screw feeding nozzle 3.

[0040] When screwing is required, the operator holds the base 1 and presses the switch button on the base 1. At this time, the motor 41 rotates, and the motor 41 drives the gear 42 to rotate through the reduction mechanism 45. The gear 42 drives the rack 43 to move downward. The rack 43 pushes the screw feed nozzle 3 downward along the rotating shaft 21, so that the end of the rotating shaft 21 leaves the outlet of the feed through hole 32. The screw in the feed through hole 32 slides into the guide through hole 31 under the action of gravity after being unobstructed by the rotating shaft 21. Then, the motor 41 rotates in the opposite direction, driving the rack 43 to move upward. The rack 43 pushes the screw feed nozzle 3 upward along the rotating shaft 21, so that the end of the rotating shaft 21 pushes the screw in the guide through hole 31. When the rack 43 reaches its maximum stroke, the rotating shaft 21 pushes the screw out of the outlet of the guide through hole 31. Then, the control system controls the electric screwdriver 2 to start, the electric screwdriver 2 drives the rotating shaft 21 to rotate, the rotating shaft 21 drives the screw to rotate, and the screw can be tightened.

[0041] During the screw-tightening process of the electric screwdriver 2, the screw feed nozzle 3 moves upward to its highest point and aligns with the screw mating nozzle 7. The screw feed nozzle 3 pushes the trigger rod 731, causing the trigger rod 731 to move upward. The trigger rod 731 drives the drive gear 733, which in turn drives the drive rod 734 to move downward. The recess 734c of the drive rod 734 moves away from the second trigger mechanism 713 and the first trigger mechanism 712, while the protrusion 734b abuts against the second trigger mechanism 713 and the first trigger mechanism 712 in succession. The sliding member 7131 of the second trigger mechanism 713 extends into the feed channel 72 and blocks the second screw and other screws above it. The protrusion 7121c of the first trigger mechanism 712 exits the feed channel 72 and releases the first screw, allowing the first screw to enter the feed through hole 32 of the screw feed nozzle 3 from the feed channel 72, providing a screw for the next screw-tightening operation. After the electric screwdriver 2 finishes screwing, the motor 41 drives the screw feed nozzle 3 to move downwards. At this time, the screw feed nozzle 3 disengages from the screw mating nozzle 7, the drive rod 734 moves upwards, and the protrusion 734b disengages from the first trigger mechanism 712 and the second trigger mechanism 713. Meanwhile, the concave part 734c successively abuts against the first trigger mechanism 712 and the second trigger mechanism 713. At this point, the first trigger mechanism 712 and the second trigger mechanism 713 reset, causing the first trigger mechanism 712 to intercept all screws, while the second trigger mechanism 713 releases screws into the feed channel 72, preparing for the next screw feeding to the screw mating nozzle 7. By repeating this cycle, continuous screw-driving operations can be achieved.

[0042] Compared with existing technologies, this utility model utilizes a rack 43, a connecting rod 44, and a screw feed nozzle 3. A gear 42 meshes with the rack 43 for drive, and the gear 42 is driven to rotate by a motor 41. Therefore, the motor 41 drives the screw feed nozzle 3 to move linearly, achieving the screw-on action of the electric screwdriver 2. Using a motor 41 for electric control eliminates the need for cylinders and air supply equipment, significantly reducing the size of the equipment. Furthermore, the electric drive is highly stable, and the motor 41 is responsive, resulting in a flexible and rapid screw-on action, greatly increasing screw-on speed and significantly improving production efficiency.

[0043] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. An electric screwdriver, characterized in that: The device includes a base, an electric screwdriver, a screw feed nozzle, a drive mechanism, and a control circuit board. The electric screwdriver is mounted on the base. The screw feed nozzle has a guide hole and a feed hole. The shaft of the electric screwdriver is slidably and telescopically inserted into the guide hole. The feed hole communicates with the guide hole to allow screws to be fed from the feed hole to the outlet of the guide hole. The drive mechanism is mounted on the base and drives the screw feed nozzle to move along the central axis of the shaft of the electric screwdriver. The drive mechanism includes a motor, a gear, and a rack. The motor is mounted on the base. The control circuit board is electrically connected to the motor and the electric screwdriver to control the motor and the electric screwdriver. The gear is connected to the output end of the motor and meshes with the rack. The rack is parallel to the central axis of the shaft and one end is connected to the screw feed nozzle to drive the screw feed nozzle to slide, thereby outputting screws one by one from the outlet.

2. The electric screwdriver according to claim 1, characterized in that: The drive mechanism also includes a reduction mechanism, which is connected between the output end of the motor and the gear.

3. The electric screwdriver according to claim 1, characterized in that: The electric screwdriver also includes a stroke controller, which includes a drive circuit board, a Hall sensor, and a magnet. The drive circuit board is disposed on the base and extends parallel to the rack. The Hall sensor is disposed at the front end, middle, and rear end of the drive circuit board facing the rack. The magnet is disposed on one side of the rack. The Hall sensor controls the stroke of the rack by sensing the position of the magnet.

4. The electric screwdriver according to claim 1, characterized in that: The rack is connected to a connecting rod at one end near the screw feed nozzle, and the other end of the connecting rod is connected to the screw feed nozzle.

5. The electric screwdriver according to claim 1, characterized in that: The base is provided with a guide tube along the central axis direction parallel to the rotating shaft, and the rack is slidably disposed within the guide tube.

6. The electric screwdriver according to claim 1, characterized in that: The electric screwdriver is connected to a screw feeding device, and the screw feeding device is connected to the screw feeding nozzle via a flexible tube to feed screws into the screw feeding nozzle.

7. The electric screwdriver according to claim 6, characterized in that: The screw feeding device is a screw vibratory feeder. The horizontal height of the output port of the screw vibratory feeder is greater than the horizontal height of the input port of the screw feeding nozzle, so that the screw is delivered from the output port of the screw vibratory feeder to the input port of the screw feeding nozzle under the action of gravity.

8. The electric screwdriver according to claim 6, characterized in that: The screw feeding device is an air-blowing screw feeder, which drives the screw to be fed to the input port of the screw feeding nozzle by blowing air into the hose.

9. The electric screwdriver according to claim 1, characterized in that: The electric screwdriver also includes a screw connector, which is fixed to the base. When the screw feed nozzle slides to the upper limit of its stroke, it engages with the screw connector to receive the screw output from the screw connector.

10. The electric screwdriver according to claim 9, characterized in that: The screw connector includes a trigger switch. When the screw feed nozzle engages with the screw connector, it triggers the trigger switch, causing the trigger switch to release a screw from the screw connector to the screw feed nozzle.

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