Screw driving mechanism

Abstract

The utility model discloses a screw driving mechanism which comprises a machine frame, a first-stage buffering mechanism, a sliding rail, an electric screwdriver assembly connected with the first-stage buffering mechanism, a second-stage buffering mechanism located below the electric screwdriver assembly, and a suction nozzle connected with the second-stage buffering mechanism and capable of being in clearance fit with the electric screwdriver assembly. The first-stage buffering mechanism comprises a first driving unit connected with the rack, a force applying seat connected to the lower end of the first driving unit and slidably connected with the sliding rail, and a first buffering elastic piece with one end connected with the lower end of the force applying seat and the other end connected with the electric screwdriver assembly. The moving electric screwdriver assembly can move in the direction away from the suction nozzle and compress the first buffering elastic piece after making contact with the workpiece. The first mounting seat is slidably connected with the sliding rail and used for mounting the suction nozzle, the first mounting seat is connected with the rack through the second buffering elastic piece, the first buffering mechanism and the second buffering mechanism are used for buffering and protecting the adsorption screws and the locking screws, and thin or brittle workpieces can be prevented from being crushed.

Description

Technical Field

[0001] The utility model belongs to the technical field of automated mechanical equipment, and particularly relates to a screw driving mechanism. Background Art

[0002] Screw assembly and locking are common fastening methods. To improve production efficiency, automatic screwdriving mechanisms are used in the electronics, automotive, and home appliance industries. However, conventional screwdriving mechanisms typically use linear actuators to control an electric screwdriver to tighten the screw. This not only easily wears the screwdriver bit, but can also damage thin or fragile workpieces, reducing product yield. Utility Model Content

[0003] Aiming at the technical problems in the prior art that screwdrivers are easily damaged and the working end is easily crushed to damage the product, the utility model provides a screw driving mechanism.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A screw driving mechanism comprises a frame, a primary buffer mechanism and a slide rail provided on the frame, an electric screwdriver assembly connected to the primary buffer mechanism and also slidably connected to the slide rail, a secondary buffer mechanism located below the electric screwdriver assembly and slidably connected to the slide rail, a suction nozzle connected to the secondary buffer mechanism and capable of clearance fit with the electric screwdriver assembly, the primary buffer mechanism comprises a first driving unit connected to the frame, a force-adding seat connected to the lower end of the first driving unit and slidably connected to the slide rail, and a first buffer elastic member connected at one end to the lower end of the force-adding seat and at the other end to the electric screwdriver assembly, the first driving unit being used to drive the electric screwdriver assembly to move toward a direction approaching the suction nozzle, and the electric screwdriver assembly, after contacting a workpiece, can move toward a direction away from the suction nozzle and compress the first buffer elastic member;

[0006] The electric screwdriver assembly includes a screwdriver assembly that is loosely fitted with the suction nozzle and can move within the suction nozzle, and a second driving unit connected to the screwdriver assembly for driving the screwdriver assembly to rotate;

[0007] The secondary buffer mechanism includes a first mounting seat slidably connected to the slide rail for mounting the suction nozzle, and a second buffer elastic member connecting the first mounting seat to the frame. When the suction nozzle contacts the workpiece or the feeding platform, the first mounting seat can be moved upward to stretch the second buffer elastic member.

[0008] Furthermore, the electric screwdriver assembly also includes a second mounting base for installing the second drive unit, the second mounting base includes a mounting panel having a vertical through cavity and located below the first buffer elastic member, and a side panel vertically connected to the upper end of the mounting panel, the vertical through cavity is for the screwdriver in the screwdriver assembly to pass through; the side wall of the mounting panel is also provided with an avoidance gap for avoiding the slide rail, and the side panel is arranged adjacent to the avoidance gap, and the side panel and the slide rail are slidably connected via a first slider.

[0009] Furthermore, the screwdriver assembly includes a clamping base detachably connected to the second drive unit, a screwdriver installed in the clamping base, a sleeve movably installed on the outside of the clamping base, a return spring provided below the clamping base for returning the sleeve, and a plurality of limiting steel balls for limiting the position of the screwdriver, the upper portion of the screwdriver is defined as a mounting section, the mounting section has a recessed portion, the mounting section with the recessed portion is mounted in the clamping base, and the clamping base is provided with at least two limiting holes at positions corresponding to the recessed portions, and the limiting steel ball is installed in each of the limiting holes for locking the position of the mounting section;

[0010] The upper end of the sleeve is provided with a first groove for installing the return spring, and the lower end of the sleeve is provided with a second groove, and a limit clamping spring is installed on the outer wall of the clamp seat, and when the limit clamping spring and the second groove are abutted, it can be used to limit the position of the sleeve; the sleeve can move back and forth along the height direction of the clamp seat, and the lower end of the clamp seat is installed in the inner cavity of the sleeve, and the inner cavity of the sleeve is provided with an avoidance groove distributed close to the second groove. When the sleeve moves toward the direction close to the clamp seat, the limiting steel ball can move toward the outside of the limiting hole and cooperate with the avoidance groove at the corresponding position to separate the mounting section from the clamp seat; when the return spring pushes the sleeve to reset, the limiting steel ball moves toward the direction close to the mounting section until the limiting steel ball is clamped in the recessed portion and the limiting hole, thereby fixing the screwdriver to the clamp seat.

[0011] Furthermore, two notched grooves arranged opposite to each other are provided at the lower end of the clamping seat, and bosses corresponding to the notched grooves are provided at corresponding positions of the screwdriver.

[0012] Furthermore, the first-level buffer mechanism also includes a guide shaft, one end of which is connected to the force-increasing seat and the other opposite end passes through the mounting panel. The two guide shafts are respectively located on both sides of the side plate, and the two guide shafts are respectively sleeved in the first buffer elastic member at the corresponding position. Each guide shaft is connected to a gasket distributed at the lower end of the mounting panel to limit the position of the mounting panel.

[0013] Furthermore, the force-adding seat is slidably connected to the slide rail via a third slider.

[0014] Furthermore, the frame includes a main frame plate and a limit plate vertically connected to the lower end of the main frame plate, the slide rail is arranged along the height direction of the main frame plate and its lower end is in contact with the upper end of the limit plate, and the main frame plate is provided with a plurality of spaced mounting holes on both sides of the slide rail;

[0015] The limiting plate is provided with a mounting notch which vertically passes through the limiting plate and is used for mounting the first mounting seat.

[0016] Furthermore, the first mounting seat includes a T-shaped slide plate slidably arranged in the mounting notch, two first bolt groups for mounting the second buffer elastic member and respectively located on both sides of the mounting notch, a second slide block provided between the T-shaped slide plate and the slide rail, and a base plate vertically connected to the lower end of the T-shaped slide plate, the T-shaped slide plate having two L-shaped limiting portions respectively located on both sides of the mounting notch and capable of contacting the limiting plate, the L-shaped limiting portion being used to limit the position of the T-shaped slide plate to prevent the T-shaped slide plate from disengaging from the mounting notch when moving downward; one side of the second slide block is slidably connected to the slide rail, and the end face away from the slide rail is detachably connected to the T-shaped slide plate;

[0017] Each of the first bolt groups includes two first bolts arranged at intervals and located on the same straight line, one of the first bolts is provided on the T-shaped slide, and the other first bolt is provided on the limiting plate, and the two first bolts on the same side are connected by the second buffer elastic member.

[0018] Furthermore, the suction nozzle includes a suction nozzle seat connected to the base plate, a sealed bearing provided in the inner cavity of the suction nozzle seat and gap-fitted with the screwdriver, a suction nozzle head connected to the lower end of the suction nozzle seat, and an air source connector provided on the outer wall of the suction nozzle head and internally communicated with the vacuum chamber of the suction nozzle head. The vacuum chamber and the inner cavity of the air source connector form a vacuum circuit, and a limiting flange is provided in the vacuum chamber for limiting the screw adsorption position.

[0019] Furthermore, a strong annular magnet is provided in the inner cavity of the nozzle holder and is located at the lower end of the sealed bearing, and the working end of the screwdriver can pass through the inner cavity of the strong annular magnet.

[0020] In summary, the beneficial effects of the present invention are as follows: First, when the suction nozzle is used to suck the screw, the secondary buffer mechanism can provide a buffer when the suction nozzle contacts the feeding platform or the workpiece. The suction nozzle does not make hard contact with the feeding platform, but can press against the feeding platform to suck the screw, thus avoiding air leakage in the vacuum circuit and making the screw adsorption more stable. During the screw locking process, after the suction nozzle contacts the workpiece, there is a buffer protection of the secondary buffer mechanism, which can prevent the suction nozzle from contacting the workpiece contact surface due to excessive contact force and damaging the surface of thin parts or brittle parts, thereby helping to improve the product yield. Second, the first drive unit is started, and the electric screwdriver assembly moves downward to lock the screw. When the reaction force pushes the mounting panel upward along the slide rail, it can form a buffer for the screwdriver, thus avoiding the mismatch between the screw locking speed and the advancement speed, and forcing the screw into the screw hole. In particular, it can prevent the screw hole of brittle workpieces (such as plastic workpieces) from being damaged when locking the screw, so as to avoid slipping or failure to achieve the required locking force, further preventing damage to the workpiece. The first-stage buffer mechanism cushions the screwdriver assembly, preventing damage to the screw caused by excessive compression. This buffer control not only protects the workpiece but also prevents damage to the screw, saving processing materials. When replacing a screwdriver, simply move the operating sleeve upward, and the limit steel ball moves out of the limit hole and falls into the avoidance groove. The screwdriver can then be easily removed from the clamp and replaced with a new one. The replacement process is simple, convenient, and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a front view of a screw driving mechanism provided by the utility model.

[0022] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure.

[0023] Figure 3 yes Figure 1 side view.

[0024] Figure 4 yes Figure 3 Cross-sectional view along the AA axis.

[0025] Figure 5 yes Figure 4 A partial enlarged view of part A in the middle.

[0026] Figure 6 It is a structural schematic diagram of the connection between the second drive unit and the screwdriver in the utility model.

[0027] Figure 7 yes Figure 6 Cross-sectional view along the BB direction.

[0028] Figure 8 yes Figure 7 A partial enlarged view of part B in the middle.

[0029] Figure 9 This is a structural schematic diagram of the utility model in which the clamping seat is not installed with a jacket.

[0030] Figure 10 It is a top view of the base plate in the utility model.

[0031] Figure 11 yes Figure 10 Cross-sectional view along CC direction.

[0032] In the figure, 100-frame, 110-main frame plate, 111-slide rail, 112-mounting hole, 120-limiting plate, 200-primary buffer mechanism, 210-first drive unit, 220-force seat, 221-third slider, 230-first buffer elastic member, 240-guide shaft, 241-washer, 300-electric screwdriver assembly, 310-screwdriver assembly, 311-clamp seat, 3110-limiting retaining spring, 312-clamping sleeve, 3120-first groove, 3121-second groove, 3122-avoidance groove, 313-screwdriver, 3130-recessed portion, 3131-convex Table, 314-reset spring, 315-limiting steel ball, 320-second drive unit, 330-second mounting seat, 331-mounting panel, 332-side plate, 3320-first slider, 400-secondary buffer mechanism, 410-first mounting seat, 411-T-type slide plate, 412-first bolt, 413-second slider, 414-base plate, 420-second buffer elastic member, 500-nozzle, 510-nozzle seat, 511-ring-shaped strong magnet, 520-sealed bearing, 530-nozzle head, 531-vacuum chamber, 540-air source connector, 600-screw. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to specific drawings.

[0034] See also Figure 1 and Figure 2The present invention provides a screw driving mechanism, comprising a frame 100, a primary buffer mechanism 200 and a slide rail 111 disposed on the frame 100, an electric screwdriver assembly 300 connected to the primary buffer mechanism 200 and also slidably connected to the slide rail 111, a secondary buffer mechanism 400 located below the electric screwdriver assembly 300 and slidably connected to the slide rail 111, and a suction nozzle 500 connected to the secondary buffer mechanism 400 and capable of clearance fit with the electric screwdriver assembly 300. The primary buffer mechanism 200 comprises a first drive unit 210 connected to the frame 100, a force-applying seat 220 connected to the lower end of the first drive unit 210 and slidably connected to the slide rail 111, and a first elastic buffer member 230 connected at one end to the lower end of the force-applying seat 220 and at the other end to the electric screwdriver assembly 300. The first drive unit 210 is configured to drive the electric screwdriver assembly 300 toward the suction nozzle 500. After contacting a workpiece, the electric screwdriver assembly 300 can move away from the suction nozzle 500 and compress the first elastic buffer member 230. The electric screwdriver assembly 300 includes a screwdriver assembly 310 that is loosely fitted with the suction nozzle 500 and can move within the suction nozzle 500, and a second drive unit 320 connected to the screwdriver assembly 310 for driving the screwdriver assembly 310 to rotate. The secondary buffer mechanism 400 includes a first mounting seat 410 that is slidably connected to the slide rail 111 for mounting the suction nozzle 500, and a second buffer elastic member 420 that connects the first mounting seat 410 to the frame 100. When the suction nozzle 500 contacts the workpiece or the feeding platform, the first mounting seat 410 can be moved upward, thereby stretching the second buffer elastic member 420. The rack 100 is mounted on a robotic arm that can be raised and lowered. The robotic arm controls the screw driving mechanism to first reach the screw feeding platform. The robotic arm drives the screw driving mechanism to move downward close to the feeding platform, and starts the second drive unit 320 to drive the screwdriver assembly 310 to rotate. The second drive unit 320 preferably adopts a servo motor, which contacts the feeding platform through the suction nozzle 500 to adsorb the screw 600 and enter the suction nozzle 500 to connect with the screwdriver assembly 310. In the process of adsorbing the screw 600, the second buffer elastic member 420 can absorb part of the impact force and provide additional buffering when the suction nozzle 500 contacts the workpiece or the feeding platform, thereby reducing the damage that may be caused by hard contact. At the same time, it can also reduce the vibration and shaking of the screw driving mechanism, thereby ensuring that the screw 600 can be accurately adsorbed and placed. The robotic arm drives the screw-driving mechanism to the top of the workpiece, and the first driving unit 210 in the first-level buffer mechanism 200 drives the force seat 220 to move downward along the slide rail 111. The first driving unit 210 preferably adopts a servo cylinder, and the force seat 220 is slidably connected to the slide rail 111 through the third slider 221, so that the electric screwdriver assembly 300 moves toward the direction close to the suction nozzle 500 (that is, moves toward the direction close to the workpiece) until the screw 600 is aligned with the screw hole on the workpiece and extends into the screw hole for locking. The screwdriver assembly 310 rotates to automatically tighten the screw 600.During the screwing process, after the screw 600 contacts the workpiece, the primary buffer mechanism 200 is subjected to the reaction force given by the screw 600. The first buffer elastic member 230 can absorb part of the impact force to prevent damage to the electric screwdriver assembly 300. It can also reduce deformation or damage to the workpiece caused by excessive pressure, thereby avoiding crushing the workpiece and ensuring product quality. The buffering of the primary buffer mechanism 200 and the secondary buffer mechanism 400 provides buffering protection for the feeding platform when sucking the screw 600. During the screwing operation, it can reduce the damage that hard contact may cause to thin or fragile parts, thereby improving product yield.

[0035] Please continue reading Figure 2 The frame 100 includes a main frame plate 110 and a stop plate 120 vertically connected to the lower end of the main frame plate 110. Slide rails 111 are arranged along the height of the main frame plate 110, with their lower ends contacting the upper end of the stop plate 120. The main frame plate 110 has a plurality of spaced mounting holes 112 on both sides of the slide rails 111. Bolts are installed in the mounting holes 112 to connect the frame 100 to the robotic arm. The screw-type screw mechanism is easy to disassemble and disassemble, making it convenient for maintenance or replacement.

[0036] The limiting plate 120 is provided with a mounting notch that extends vertically through the limiting plate 120 for mounting the first mounting seat 410. The first mounting seat 410 includes a T-shaped slide 411 that slides within the mounting notch, two first bolt groups located on either side of the mounting notch for mounting the second elastic buffer member 420, a second slider 413 located between the T-shaped slide 411 and the slide rail 111, and a base plate 414 vertically connected to the lower end of the T-shaped slide 411. The T-shaped slide 411 has two L-shaped limiting portions located on either side of the mounting notch and capable of contacting the limiting plate 120. The L-shaped limiting portions are used to limit the position of the T-shaped slide 411 to prevent it from disengaging from the mounting notch when moving downward. One side of the second slider 413 is slidably connected to the slide rail 111, while the end face away from the slide rail 111 is detachably connected to the T-shaped slide 411. The T-shaped slide 411 is preferably connected to the second slider 413 using bolts.

[0037] See also Figure 3Each first bolt 412 group includes two first bolts 412 arranged at intervals and located on the same straight line, one first bolt 412 is provided on the T-shaped slide 411, and the other first bolt 412 is provided on the limiting plate 120, and the two first bolts 412 on the same side are connected by a second buffer elastic member 420. The second buffer elastic member 420 preferably adopts a tension spring, and the two ends of the tension spring are respectively hung on the first bolt 412 at the corresponding position. When sucking the screw 600 or locking the screw 600, after the suction nozzle 500 contacts the workpiece or the feeding platform, the reaction force pushes the T-shaped slide 411 to move upward along the installation notch, and the second slider 413 and the slide rail 111 cooperate to guide the movement of the T-shaped slide 411. At this time, the second buffer elastic member 420 is in a stretched state, and the suction nozzle 500 will also move upward a distance accordingly. When the reaction force disappears or decreases to a certain extent, due to the restoring force of the tension spring, the T-shaped slide 411 will move downward along the installation notch, driving the suction nozzle 500 back to the initial position or a state close to the initial position. During the above-mentioned return process, the restoring force of the tension spring gradually decreases, so the return is relatively smooth, thereby avoiding the impact and vibration caused by sudden return. Therefore, it can provide buffering protection for the workpiece or feeding platform in contact with the suction nozzle 500, and when locking the screw 600, it can prevent the suction nozzle 500 from pressing the contact surface of the workpiece due to excessive contact force.

[0038] See also Figure 10 and Figure 11 The suction nozzle 500 includes a suction nozzle seat 510 connected to the base plate 414, a sealed bearing 520 provided in the inner cavity of the suction nozzle seat 510 and having a clearance fit with the screwdriver 313, a suction nozzle head 530 connected to the lower end of the suction nozzle seat 510, and an air source connector 540 provided on the outer wall of the suction nozzle head 530 and internally communicating with the vacuum chamber 531 of the suction nozzle head 530. The vacuum chamber 531 and the inner cavity of the air source connector 540 form a vacuum circuit, and a limiting flange is provided in the vacuum chamber 531 for limiting the suction position of the screw 600. After the screw 600 is sucked into the suction nozzle 500, the limiting flange can prevent the screwdriver 313 from going too deep when sucking the screw 600, thereby avoiding damage to the suction nozzle 500 or the screwdriver 313 that may be caused by excessive force. The screw 600 is effectively confined to a specific area of ​​the nozzle head 530, making it easier to control the suction and placement process of the screw 600, thereby improving the accuracy and efficiency of operations on automated or high-speed assembly lines.

[0039] See also Figure 4The inner cavity of the nozzle holder 510 is also equipped with a strong annular magnet 511 located at the lower end of the sealed bearing 520. The working end of the screwdriver 313 can pass through the inner cavity of the strong annular magnet 511. The inner ring of the sealed bearing 520 and the small gap between the screwdriver 313 and the inner ring of the sealed bearing 520 cooperate to form a seal. The suction nozzle 500, cushioned by the secondary buffer mechanism 400, can press against the screw feeder platform to prevent vacuum gas leakage and effectively and stably absorb the screw 600. The strong annular magnet 511 serves to enhance the magnetic force of the screwdriver 313, helping the screwdriver 313 to maintain a stable and secure connection with the screw 600.

[0040] The electric screwdriver assembly 300 also includes a second mounting base 330 for mounting the second drive unit 320. The second mounting base 330 includes a mounting panel 331 having a vertical through cavity and located below the first buffer elastic member 230, and a side plate 332 vertically connected to the upper end of the mounting panel 331. The vertical through cavity is for the screwdriver 313 in the screwdriver assembly 310 to pass through.

[0041] The primary buffer mechanism 200 also includes a guide shaft 240, one end of which is connected to the force base 220 and the other end of which passes through the mounting panel 331. Two guide shafts 240 are located on either side of the side plate 332. Each guide shaft 240 is slotted into a corresponding first elastic buffer member 230. Each guide shaft 240 is connected to a washer 241 located at the lower end of the mounting panel 331 to constrain the mounting panel 331. The sidewall of the mounting panel 331 also has a clearance notch for the slide rail 111. The side plate 332 is positioned adjacent to the clearance notch and is slidably connected to the slide rail 111 via a first slider 3320. The first elastic buffer member 230 is preferably a spring. When the screw tightening process 600 begins, the first drive unit 210 is activated, driving the force base 220 and the electric screwdriver assembly 300 (comprising the screwdriver assembly 310 and the second drive unit 320) toward the workpiece. During this movement, the screwdriver assembly 310 of the electric screwdriver assembly 300 is ready to screw the screw 600 into the workpiece. Once the screwdriver assembly 310 contacts the screw hole on the workpiece and begins to apply force to tighten the screw 600, a large impact force or resistance may be generated due to factors such as a slight deviation of the screw hole or the initial friction between the screw and the screw hole. At this time, the first buffer elastic member 230 (spring) plays a key role. Since the spring is elastic, when the electric screwdriver assembly 300 is subjected to resistance from the workpiece, the spring can absorb and buffer this part of the impact force, allowing the electric screwdriver assembly 300 to move slightly backward relative to the force seat 220 and the first drive unit 210 (that is, the mounting panel 331 drives the second drive unit 320 to move upward along the slide rail 111). This backward movement helps to reduce the mechanical stress caused by direct impact, thereby protecting the electric screwdriver assembly 300 and the screw 600 from damage or deformation.

[0042] See also Figure 5-Figure 9 The screwdriver assembly 310 includes a clamping base 311 detachably connected to the second driving unit 320, a screwdriver 313 installed in the clamping base 311, a sleeve 312 movably installed on the outside of the clamping base 311, a return spring 314 provided below the clamping base 311 for returning the sleeve 312, and a plurality of limiting steel balls 315 for limiting the position of the screwdriver 313. The upper portion of the screwdriver 313 is defined as a mounting section, and the mounting section has a recessed portion 3130. The mounting section with the recessed portion 3130 is mounted in the clamping base 311, and the clamping base 311 is provided with at least two limiting holes at positions corresponding to the recessed portion 3130, and a limiting steel ball 315 is installed in each limiting hole for locking the position of the mounting section. Please continue to refer to Figure 8 The upper end of the jacket 312 is provided with a first groove 3120 for installing a return spring 314, and the lower end of the jacket 312 is provided with a second groove 3121. The outer wall of the clamping seat 311 is provided with a limit spring 3110. When the limit spring 3110 abuts against the second groove 3121, it can be used to limit the position of the jacket 312. The jacket 312 can move back and forth along the height direction of the clamping seat 311, and the lower end of the clamping seat 311 is installed in the inner cavity of the jacket 312. The inner cavity of the jacket 312 is provided with an avoidance groove 3122 distributed near the second groove 3121. When the jacket 312 moves toward the direction close to the clamping seat 311, the limiting steel ball 315 can move toward the outside of the limiting hole and cooperate with the avoidance groove 3122 at the corresponding position to separate the installation section from the clamping seat 311. When the return spring 314 pushes the sleeve 312 back to its original position, the limiting steel ball 315 moves toward the mounting section until it engages with the recess 3130 and the limiting hole, thereby securing the screwdriver 313 to the clamping base 311. The design of the return spring 314 allows the sleeve 312 to automatically reset when no external force is applied, thereby driving the limiting steel ball 315 to reengage with the limiting hole, quickly securing the screwdriver 313. When the limiting steel ball 315 engages with the recess 3130 and the limiting hole, they form a secure locking mechanism that ensures that the screwdriver 313 will not loosen or fall off due to vibration or external force during the screw tightening process, thereby ensuring the stability and safety of the screw driving operation.

[0043] With the above structure, since the mounting section of the screwdriver 313 is locked within the clamping base 311 by the design of the limiting steel ball 315 and the limiting hole, when the screwdriver 313 needs to be replaced, the limiting steel ball 315 can be easily removed from the limiting hole by moving the sleeve 312 and falling into the avoidance groove 3122. The screwdriver 313 can then be easily removed from the clamping base 311 and a new screwdriver 313 can be installed. This design greatly simplifies the process of replacing the screwdriver 313 and improves work efficiency. Because the clamping base 311 and the sleeve 312 are detachably connected, screwdrivers 313 of different specifications or types can be replaced according to different work needs, thereby improving the flexibility and adaptability of the screwdriver assembly 310.

[0044] The lower end of the clamping base 311 is equipped with two opposing notches. Bosses 3131 corresponding to the notches are located at corresponding positions on the screwdriver 313. When the second drive unit 320 rotates the screwdriver 313, the notches contact the bosses 3131, effectively transmitting torque to the screwdriver 313. This ensures that the screw 600 is properly tightened to the desired torque value. This optimized torque transmission reduces wear and fatigue on the screwdriver 313 and the drive unit, thereby extending the service life of the tool and equipment.

[0045] This screw-driving mechanism: 1. When the suction nozzle 500 picks up the screw 600, the secondary buffer mechanism 400 can provide cushioning when the suction nozzle 500 contacts the feed platform or workpiece. The suction nozzle 500 does not make direct contact with the feed platform, but can instead press against the feed platform to pick up the screw 600, preventing air leaks in the vacuum circuit and ensuring more secure attachment of the screw 600. During the screw-driving process, after the suction nozzle 500 contacts the workpiece, the secondary buffer mechanism 400 provides buffering protection, preventing the suction nozzle 500 from contacting the workpiece due to excessive contact force and damaging the surface of thin or fragile parts, thereby helping to improve product yield. Second, the first drive unit 210 is activated, and the electric screwdriver assembly 300 moves downward to tighten the screw 600. When the reaction force pushes the mounting panel 331 upward along the slide rail 111, a buffer is formed for the screwdriver 313, which can prevent the screw 600 from being locked and pushed into the screw hole due to a mismatch between the screw 600 locking speed and the advancement speed. This can prevent the screw 600 from being forced into the screw hole. In particular, it can prevent brittle workpieces (such as plastic workpieces) from being damaged when the screw 600 is tightened, thereby avoiding the occurrence of slipping threads or failure to achieve the required tightening force, further preventing damage to the workpiece. In addition, the first-level buffer mechanism 200 can buffer the electric screwdriver assembly 300, which can avoid excessive squeezing of the screw 600 and damage to the screw 600. The buffer control not only protects the workpiece, but also avoids damage to the screw 600, saving processing materials. 3. When replacing the screwdriver 313, the operating sleeve 312 is moved upward, the limiting steel ball 315 is moved out of the limiting hole and falls into the avoidance groove 3122, and the screwdriver 313 can be easily removed from the clamping seat 311 and a new screwdriver 313 can be installed. The replacement process is simple and convenient.

[0046] The above is only an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure made using the contents of the description and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the patent protection scope of the present invention.

Claims

1. A screw driving mechanism, characterized in that: The invention comprises a frame, a primary buffer mechanism and a slide rail provided on the frame, an electric screwdriver assembly connected to the primary buffer mechanism and also slidably connected to the slide rail, a secondary buffer mechanism located below the electric screwdriver assembly and slidably connected to the slide rail, a suction nozzle connected to the secondary buffer mechanism and capable of gap-matching with the electric screwdriver assembly, the primary buffer mechanism comprises a first driving unit connected to the frame, a force-adding seat connected to the lower end of the first driving unit and slidably connected to the slide rail, and a first buffer elastic member connected at one end to the lower end of the force-adding seat and at the other end to the electric screwdriver assembly, the first driving unit being used to drive the electric screwdriver assembly to move toward a direction close to the suction nozzle, and the electric screwdriver assembly, after contacting the workpiece, can move toward a direction away from the suction nozzle and compress the first buffer elastic member; The electric screwdriver assembly includes a screwdriver assembly that is loosely fitted with the suction nozzle and can move within the suction nozzle, and a second driving unit connected to the screwdriver assembly for driving the screwdriver assembly to rotate; The secondary buffer mechanism includes a first mounting seat slidably connected to the slide rail for mounting the suction nozzle, and a second buffer elastic member connecting the first mounting seat to the frame. When the suction nozzle contacts the workpiece or the feeding platform, the first mounting seat can be moved upward to stretch the second buffer elastic member.

2. The screw driving mechanism according to claim 1, characterized in that: The electric screwdriver assembly also includes a second mounting base for mounting the second drive unit, the second mounting base includes a mounting panel having a vertical through cavity and located below the first buffer elastic member, and a side panel vertically connected to the upper end of the mounting panel, the vertical through cavity is for the screwdriver in the screwdriver assembly to pass through; the side wall of the mounting panel is also provided with an avoidance gap for avoiding the slide rail, and the side panel is arranged adjacent to the avoidance gap, and the side panel and the slide rail are slidably connected via a first slider.

3. The screw driving mechanism according to claim 2, characterized in that: The screwdriver assembly includes a clamping base detachably connected to the second driving unit, a screwdriver installed in the clamping base, a sleeve movably installed on the outside of the clamping base, a return spring provided below the clamping base for returning the sleeve, and a plurality of limiting steel balls for limiting the position of the screwdriver, the upper portion of the screwdriver is defined as a mounting section, the mounting section has a recessed portion, the mounting section with the recessed portion is mounted in the clamping base, and the clamping base is provided with at least two limiting holes at positions corresponding to the recessed portions, and the limiting steel ball is installed in each of the limiting holes for locking the position of the mounting section; The upper end of the sleeve is provided with a first groove for installing the return spring, and the lower end of the sleeve is provided with a second groove, and a limit clamping spring is installed on the outer wall of the clamp seat, and when the limit clamping spring and the second groove are abutted, it can be used to limit the position of the sleeve; the sleeve can move back and forth along the height direction of the clamp seat, and the lower end of the clamp seat is installed in the inner cavity of the sleeve, and the inner cavity of the sleeve is provided with an avoidance groove distributed close to the second groove. When the sleeve moves toward the direction close to the clamp seat, the limiting steel ball can move toward the outside of the limiting hole and cooperate with the avoidance groove at the corresponding position to separate the mounting section from the clamp seat; when the return spring pushes the sleeve to reset, the limiting steel ball moves toward the direction close to the mounting section until the limiting steel ball is clamped in the recessed portion and the limiting hole, thereby fixing the screwdriver to the clamp seat.

4. The screw driving mechanism according to claim 3, characterized in that: The lower end of the clamping seat is provided with two notched grooves arranged opposite to each other, and a boss corresponding to the notched grooves is provided at a corresponding position of the screwdriver.

5. The screw driving mechanism according to claim 2, characterized in that: The first-level buffer mechanism also includes a guide shaft, one end of which is connected to the force-adding seat and the other opposite end passes through the mounting panel. The two guide shafts are respectively located on both sides of the side plate, and the two guide shafts are respectively sleeved in the first buffer elastic member at the corresponding position. Each guide shaft is connected to a gasket distributed at the lower end of the mounting panel to limit the position of the mounting panel.

6. The screw driving mechanism according to claim 1, characterized in that: The force-adding seat is slidably connected to the slide rail via a third sliding block.

7. The screw driving mechanism according to any one of claims 1 to 6, characterized in that: The frame includes a main frame plate and a limit plate vertically connected to the lower end of the main frame plate, the slide rail is arranged along the height direction of the main frame plate and its lower end is in contact with the upper end of the limit plate, and the main frame plate is provided with a plurality of spaced mounting holes on both sides of the slide rail; The limiting plate is provided with a mounting notch which vertically passes through the limiting plate and is used for mounting the first mounting seat.

8. The screw driving mechanism according to claim 7, characterized in that: The first mounting seat includes a T-shaped slide plate slidably arranged in the mounting notch, two first bolt groups for mounting the second buffer elastic member and respectively located on both sides of the mounting notch, a second slide block provided between the T-shaped slide plate and the slide rail, and a base plate vertically connected to the lower end of the T-shaped slide plate, the T-shaped slide plate having two L-shaped limiting portions respectively located on both sides of the mounting notch and capable of contacting the limiting plate, the L-shaped limiting portion being used to limit the position of the T-shaped slide plate to prevent the T-shaped slide plate from disengaging from the mounting notch when moving downward; one side of the second slide block is slidably connected to the slide rail, and the end face away from the slide rail is detachably connected to the T-shaped slide plate; Each of the first bolt groups includes two first bolts arranged at intervals and located on the same straight line, one of the first bolts is provided on the T-shaped slide, and the other first bolt is provided on the limiting plate, and the two first bolts on the same side are connected by the second buffer elastic member.

9. The screw driving mechanism according to claim 8, characterized in that: The suction nozzle includes a suction nozzle seat connected to the base plate, a sealed bearing arranged in the inner cavity of the suction nozzle seat and gap-matched with the screwdriver, a suction nozzle head connected to the lower end of the suction nozzle seat, and an air source connector arranged on the outer wall of the suction nozzle head and internally communicated with the vacuum chamber of the suction nozzle head. The vacuum chamber and the inner cavity of the air source connector form a vacuum circuit, and a limiting flange is provided in the vacuum chamber for limiting the screw adsorption position.

10. The screw driving mechanism according to claim 9, characterized in that: An annular strong magnet located at the lower end of the sealed bearing is further provided in the inner cavity of the nozzle seat, and the working end of the screwdriver can pass through the inner cavity of the annular strong magnet.

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