Linear module driven single-station screw locking precision positioning device

Abstract

The utility model discloses a single work position lock screw precision positioning device of linear module drive belongs to screw lock equipment technical field. Including servo lifting module, buffer air cylinder, guide rail sliding block unit and clamping mouth unit, servo electric wrench, servo lifting module includes screw rod sliding table, the sliding end of screw rod sliding table is fixed with slide, and the drive end of screw rod sliding table is installed with lifting servo motor, buffer air cylinder is fixed in the front side of slide, guide rail sliding block unit includes with the guide rail of inlaying fixed of slide, the sliding block is set up on the guide rail and slides, the piston rod of buffer air cylinder and sliding block side portion fixed mounting, servo electric wrench and sliding block fixed mounting, the front end of servo electric wrench is fixed with the wrench head, the utility model discloses a single work position lock screw precision positioning device of linear module drive has established the lock system of accurate lifting, flexible buffering and parameter controllable, can realize the precision positioning and lock of screw.

Description

Technical Field

[0001] This utility model specifically relates to a single-station screw fastening precision positioning device driven by a linear module, belonging to the technical field of screw fastening equipment. Background Technology

[0002] A screw fastening machine is an automated device used for screw fastening operations. Using a screw fastening machine can greatly improve the efficiency and accuracy of screw assembly. For example, Chinese Patent Publication No. CN119927613A discloses a fastening mechanism and a screw fastening machine. The fastening mechanism includes a base plate, a fastening assembly, a storage tray, and a storage drive assembly. The fastening assembly is located on the base plate and is used to pick up screws and place them into the workpiece to fasten them. Existing screw fastening machines use a cylinder as the power source for the electric screwdriver's lifting and lowering. The extension and retraction of the cylinder piston rod drives the electric screwdriver up and down along a simple guide rail. The electric screwdriver used for fastening can only achieve "start / stop" on / off control. For example, when fastening screws to plate-like workpieces (door panels, window frames), the cylinder is vented, the piston rod extends, and the electric screwdriver descends along the guide rail; the electric screwdriver contacts the workpiece. Afterwards, the rotation is started to screw the screw into the workpiece; after the fastening is completed, the cylinder exhausts air, the piston rod retracts, and the electric screwdriver rises to reset; however, the lifting accuracy of this structure is poor, and the cylinder is affected by air pressure fluctuations and piston clearance, making it impossible to stably control the height of the electric screwdriver (the error can reach more than 0.5mm), resulting in misalignment of the screw holes between the electric screwdriver and the board-type workpiece, and the screws are easy to be crooked or tilted; moreover, the electric screwdriver can only work in an "on-off" manner, and cannot accurately adjust the torque and speed; when fastening solid wood door panels, excessive torque can easily crack the wood; when fastening aluminum profile window frames, excessive speed can easily strip the threads, and the fastening quality is unstable; in addition, the existing fastening machine uses rigid contact or simple spring buffer, which cannot effectively absorb the instantaneous reaction force of fastening. Utility Model Content

[0003] To address the aforementioned issues, this invention proposes a linear module-driven single-station screw-locking precision positioning device, which constructs a precise lifting, flexible buffering, and parameter-controllable locking system, enabling precise positioning and locking of screws.

[0004] This utility model discloses a linear module-driven single-station screw-locking precision positioning device, comprising:

[0005] The servo lifting module includes a lead screw slide, with a slide block fixed to the sliding end of the lead screw slide, and a lifting servo motor installed at the driving end of the lead screw slide. The lifting servo motor serves as the lifting power source, outputting precise driving force to control the electric screwdriver's lifting movement along the lead screw slide, accurately adjusting the electric screwdriver's height to ensure alignment with the screw holes of plate-like cubic workpieces. The lead screw slide is the track for the vertical movement of the electric screwdriver, providing guidance for its lifting and lowering, ensuring stable vertical movement, and working in conjunction with the lifting servo motor to achieve precise lifting and lowering.

[0006] A buffer cylinder is fixed to the front side of the slide block. Employing a flexible structure with a buffer mechanism, the cylinder acts as a flexible buffer unit. During screw fastening, air pressure compression absorbs the instantaneous reaction force, preventing rigid collisions between the electric screwdriver and the workpiece and protecting the appearance of the door panel paint, profile surface, and other workpieces. When tightening screws, air pressure buffering absorbs the locking reaction force, preventing rigid impact damage to the workpiece and affecting the electric screwdriver, maintaining stable fastening. This solves the nonlinearity problem and chain-reaction damage from rigid contact inherent in existing spring buffers. Specifically, with spring buffers, insufficient initial buffering leads to rigid impacts from the electric screwdriver on the workpiece surface (e.g., scratches on the door panel paint, dents on the aluminum profile), and later, excessive spring force pushes the electric screwdriver back, resulting in insufficient screw fastening depth. Without a buffer structure, the chain-reaction damage from rigid contact between the electric screwdriver and the workpiece, such as direct collisions, causes surface damage and significantly increases the defect rate. Long-term impacts also accelerate the wear of the linear module, continuously deteriorating the lifting accuracy.

[0007] The guide rail slider unit includes a guide rail that is fitted and fixed to a slide block, and a slider that is slidably disposed on the guide rail. The piston rod of the buffer cylinder is fixedly installed on the side of the slider. The guide rail slider unit assists in the lifting and lowering of the servo electric screwdriver, guides and bears the load, and works with the linear module to limit the deviation of the electric screwdriver.

[0008] A servo electric screwdriver is fixedly installed with a slider; a screwdriver bit is fixed at the front end of the servo electric screwdriver; as the core component for screw fastening, the servo electric screwdriver precisely controls torque and speed, adapts to the material of plate-type workpieces and screw types, solves the problem of fixed parameters of traditional electric screwdrivers, and ensures the quality of screw fastening; the screwdriver bit performs the screw fastening action, receives the torque and speed of the servo electric screwdriver, screws the screw into the workpiece, adapts to common screw types, and ensures smooth fastening;

[0009] The clamping unit includes a clamping mount, on which a screw clamp is mounted. The clamping mount is fixed to the bottom of the slide and is positioned directly opposite the slide. The screw clamp is coaxially aligned with the bit. The screw clamp receives and secures the screw, stabilizing its position and ensuring coaxial alignment with the bit and the screw hole on the workpiece, thus preventing locking misalignment.

[0010] Working Process: Initially, the lifting servo motor drives the electric screwdriver to a high position, and the screw chuck receives the screw to be tightened, with the screwdriver bit aligned with the screw. Then, the lifting servo motor starts, driving the electric screwdriver vertically downwards along the servo lifting module and guide rail slider unit, with the buffer cylinder moving downwards synchronously. When it reaches the set position, the buffer cylinder activates, driving the slider and chuck mounting base to engage and align, causing the servo electric screwdriver to press down, and the screwdriver bit contacts the screw. Next, the servo electric screwdriver precisely adjusts the torque and speed according to the workpiece and screw parameters to tighten the screw. At this time, the buffer cylinder provides compression and buffering, while maintaining continuous flexible support. After tightening, the lifting servo motor reverses its rotation, driving the electric screwdriver upwards along the servo lifting module and guide rail slider unit to reset, and the screw chuck prepares to receive the next screw, entering the next tightening cycle.

[0011] Furthermore, the slide block has a mounting groove on its front side, and a row of screw holes is provided inside the mounting groove. A cylinder seat is movably embedded inside the mounting groove, and the cylinder seat is fastened to the screw holes by bolts. The buffer cylinder is fixed to the cylinder seat. The height of the buffer cylinder can be adjusted by moving the cylinder seat up and down in the mounting groove. After adjustment, the height of the buffer cylinder can be adjusted by locking it with bolts and screw holes.

[0012] Furthermore, the screw chuck is an air-feed screw chuck, and the feed connector of the air-feed screw chuck is connected to the screw feeding device through a feed pipe; a tube seat is fixed at the lower part of the slide; the feed pipe passes through the tube seat; the screw feeding device first vibrates and sorts the screws, and then drives the screws into the screw chuck through the feed pipe, waiting for the screwdriver bit to receive the screws and perform the fastening work.

[0013] Furthermore, a laser ranging module is fitted and fixed on the clamping nozzle mounting base. The laser ranging module can realize the distance between the clamping nozzle mounting base and the workpiece, thereby enabling precise positioning of the distance between the screw clamping nozzle and the locking screw hole.

[0014] Furthermore, the lead screw slide is fixed directly above the screw fastening station of the workpiece mounting platform.

[0015] Compared with the prior art, the linear module driven single-station screw-locking precision positioning device of this utility model has the following advantages:

[0016] (1) The lifting drive adopts a lifting servo motor. The lifting servo motor realizes the precise adjustment of the lifting height of the electric screwdriver through closed-loop control, solves the positioning deviation problem caused by air pressure fluctuation of the cylinder, and ensures the precise alignment of the electric screwdriver with the screw hole of the plate workpiece. The lead screw slide provides a stable vertical guide for the electric screwdriver, and the guide rail slider unit constrains the motion deviation, forming a dual precise control of "power + track", breaking through the technical bottleneck of "fuzzy height control" of traditional cylinder.

[0017] (2) Parameterized control of locking execution: Equipped with a servo electric screwdriver to replace the ordinary electric screwdriver, the locking process can be precisely controlled by multiple parameters: The torque and speed can be flexibly adjusted according to the material of the board workpiece (such as solid wood and aluminum profile) and the screw specifications, avoiding problems such as screw stripping and workpiece breakage caused by fixed parameters of traditional electric screwdrivers; The dynamic response characteristics of the servo electric screwdriver are linked with the lifting servo motor in real time, solving the defect of asynchronous start-stop and lifting action of electric screwdriver in the existing technology, and improving the timing coordination of locking;

[0018] (3) The flexible support of the buffer cylinder can offset the impact vibration during the locking process, prevent the electric screwdriver from shifting its posture, further consolidate the lifting and positioning accuracy, and form a stable working process of lifting, positioning, contact, buffering and locking.

[0019] (4) For screw fastening of plate-type cubic workpieces (such as door panels and window frames), it significantly improves the screw fastening accuracy and production yield in the assembly industry. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the single-station screw-locking precision positioning device of this utility model.

[0021] Figure 2 For the present utility model Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0022] Figure 3 This is a schematic diagram of the mounting structure of the clamp mount and laser ranging module of this utility model.

[0023] Reference numerals: 1. Lead screw slide, 2. Slide, 3. Lifting servo motor, 4. Servo electric screwdriver, 5. Buffer cylinder, 6. Guide rail, 7. Slider, 8. Screwdriver bit, 9. Grip mount, 10. Screw gripper, 11. Mounting slot 1, 12. Cylinder seat, 13. Feed tube, 14. Laser ranging module. Detailed Implementation

[0024] Example 1:

[0025] like Figures 1 to 3 The linear module-driven single-station screw-locking precision positioning device shown includes:

[0026] The servo lifting module includes a lead screw slide 1, a slide block 2 fixed to the sliding end of the lead screw slide 1, and a lifting servo motor 3 installed on the driving end of the lead screw slide 1. The lifting servo motor 3 serves as the lifting power source, outputting precise driving force to control the electric screwdriver to move up and down along the lead screw slide 1, precisely adjusting the height of the electric screwdriver to ensure alignment with the screw holes of plate-type cubic workpieces. The lead screw slide 1 is the track for the vertical movement of the electric screwdriver, providing guidance for the lifting of the electric screwdriver and ensuring stable movement of the electric screwdriver in the vertical direction, thus achieving precise lifting in conjunction with the lifting servo motor 3.

[0027] A buffer cylinder 5 is fixed to the front side of the slide block 2. It employs a flexible structure with a buffer mechanism, using the buffer cylinder 5 as a flexible buffer unit. During screw fastening, air pressure compression absorbs the instantaneous reaction force, preventing rigid collision between the electric screwdriver and the workpiece and protecting the appearance of the workpiece, such as the door panel paint and profile surface. When tightening screws, air pressure buffering absorbs the locking reaction force, preventing rigid impact damage to the workpiece and affecting the electric screwdriver, maintaining stable fastening. This solves the nonlinearity problem and chain damage from rigid contact inherent in existing spring buffers. Specifically, if spring buffering is used, insufficient initial buffering leads to rigid impact of the electric screwdriver on the workpiece surface (such as scratches on the door panel paint or dents on the aluminum profile), and later, excessive spring force pushes the electric screwdriver back, resulting in insufficient screw fastening depth. Without a buffer structure, the chain damage from rigid contact between the electric screwdriver and the workpiece, such as direct collision between the electric screwdriver and the workpiece, causes surface damage and significantly increases the defect rate. Long-term impact also accelerates the wear of the linear module, causing continuous deterioration of lifting accuracy.

[0028] The guide rail slider unit includes a guide rail 6 that is fitted and fixed to the slide block 2, and a slider 7 that is slidably disposed on the guide rail 6. The piston rod of the buffer cylinder 5 is fixedly installed on the side of the slider 7. The guide rail 6 slider 7 unit assists the servo electric screwdriver 4 in lifting, guiding and bearing weight, and cooperates with the linear module to limit the deviation of the electric screwdriver.

[0029] The servo electric screwdriver 4 is fixedly installed with the slider 7; the front end of the servo electric screwdriver 4 is fixed with a screwdriver bit 8; the servo electric screwdriver 4 is the core component for screw fastening, which can precisely control the torque and speed, adapt to the material of plate-type workpieces and screw types, solve the problem of fixed parameters of traditional electric screwdrivers, and ensure the fastening quality; the screwdriver bit 8 performs the screw fastening action, receives the torque and speed of the servo electric screwdriver 4, screws the screw into the workpiece, adapts to common screw types, and ensures smooth fastening;

[0030] The clamping unit includes a clamping mount 9 on which a screw clamp 10 is mounted. The clamping mount 9 is fixed to the bottom of the slide block 2 and is positioned directly opposite the slide block 7. The screw clamp 10 is coaxially aligned with the bit 8. The screw clamp 10 receives and secures the screw, stabilizing its posture and ensuring coaxial alignment with the bit 8 and the screw hole of the workpiece, thus preventing locking misalignment.

[0031] Working Process: In the initial state, the lifting servo motor 3 drives the electric screwdriver to a high position, the screw chuck 10 receives the screw to be locked, and the screwdriver bit 8 is aligned with the screw. Then, the lifting servo motor 3 starts, driving the electric screwdriver vertically downwards along the servo lifting module and the slider 7 unit of the guide rail 6, while the buffer cylinder 5 moves downwards synchronously. When it reaches the set position, the buffer cylinder 5 activates, driving the slider 7 and the chuck mounting base 9 to engage and align, and the servo electric screwdriver 4 presses down, with the screwdriver bit 8 contacting the screw. Next, the servo electric screwdriver 4 precisely adjusts the torque and speed according to the workpiece and screw parameters to tighten the screw. At this time, the buffer cylinder 5 provides compression and buffering, and continuous flexible support. After locking is completed, the lifting servo motor 3 reverses its rotation, driving the electric screwdriver upwards and resets along the servo lifting module and the slider 7 unit of the guide rail 6, and the screw chuck 10 prepares to receive the next screw, entering the next locking cycle.

[0032] The slide block 2 has a mounting groove 11 on its front side. A row of screw holes is provided inside the mounting groove 11. A cylinder seat 12 is movably embedded inside the mounting groove 11. The cylinder seat 12 is fastened to the screw holes by bolts. The buffer cylinder 5 is fixed to the cylinder seat 12. The vertical position of the cylinder seat 12 can be adjusted within the mounting groove 11. After adjustment, the height of the buffer cylinder 5 can be adjusted by locking it with bolts and screw holes.

[0033] The screw chuck 10 is an air-feed screw chuck, and the feed connector of the air-feed screw chuck is connected to the screw feeding device through the feed pipe 13; the lower part of the slide 2 is fixed with a pipe seat; the feed pipe 13 passes through the pipe seat; the screw feeding device first vibrates and sorts the screws, and then drives the screws into the screw chuck 10 through the feed pipe 13, waiting for the screwdriver bit 8 to receive the screws and perform the fastening work.

[0034] A laser ranging module 14 is fitted and fixed on the clamping nozzle mounting base 9. The laser ranging module 14 can realize the distance between the clamping nozzle mounting base 9 and the workpiece, thereby accurately positioning the distance between the screw clamping nozzle 10 and the locking screw hole.

[0035] The lead screw slide 1 is fixed directly above the screw fastening station of the workpiece mounting platform.

[0036] The above embodiments are merely preferred embodiments of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model are included within the scope of the present utility model.

Claims

1. A single-station precision screw-locking positioning device driven by a linear module, characterized in that: include: A servo lifting module, comprising a lead screw slide, a slide block fixed to the sliding end of the lead screw slide, and a lifting servo motor mounted on the driving end of the lead screw slide; A buffer cylinder, wherein the buffer cylinder is fixed to the front side of the slide block; A guide rail slider unit includes a guide rail that is fitted and fixed to a slide block, a slider that is slidably disposed on the guide rail, and a piston rod of a buffer cylinder that is fixedly installed on the side of the slider. A servo electric screwdriver, wherein the servo electric screwdriver is fixedly mounted to a slider; a screwdriver bit is fixed to the front end of the servo electric screwdriver; The clamping unit includes a clamping mount, on which a screw clamp is mounted; the clamping mount is fixed to the bottom of the slide and is positioned directly opposite the slide; the screw clamp is coaxially arranged with the screwdriver bit.

2. The linear module-driven single-station screw-locking precision positioning device according to claim 1, characterized in that: The slide block has a mounting groove on its front side, and a row of screw holes is opened inside the mounting groove. A cylinder seat is movably embedded inside the mounting groove, and the cylinder seat is fastened to the screw holes by bolts; the buffer cylinder is fixed to the cylinder seat.

3. The linear module-driven single-station screw-locking precision positioning device according to claim 1, characterized in that: The screw clamp is an air-feed screw clamp, and the feed connector of the air-feed screw clamp is connected to the screw feeding device through a feed pipe; a tube seat is fixed at the lower part of the slide; the feed pipe passes through the tube seat.

4. The linear module-driven single-station screw-locking precision positioning device according to claim 1, characterized in that: A laser ranging module is fitted and fixed on the clamp mounting base.

5. The linear module-driven single-station screw-locking precision positioning device according to claim 1, characterized in that: The lead screw slide is fixed directly above the screw fastening station of the workpiece mounting platform.

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