Screw cleaning mechanism for automatic screw locking device

Abstract

A screw cleaning mechanism for an automatic screw locking device comprises a mounting plate and a clamping assembly arranged on the mounting plate. A blanking through hole is formed in the mounting plate; the clamping assembly comprises a plurality of rotatable clamping jaws, a synchronous transmission part and a driving device; the multiple clamping jaws are distributed in the circumferential direction of the discharging through hole, and clamping parts are arranged on the clamping jaws; the synchronous transmission part is in transmission connection with the multiple clamping jaws, and the driving device drives the synchronous transmission part to move, so that the multiple clamping jaws are synchronously folded towards the interior of the discharging through hole to clamp the screws or synchronously away from the discharging through hole to open to release the screws. Compared with the prior art, the screw cleaning mechanism can automatically clean residual screws on the screwdriver rod assembly.

Description

A screw cleaning mechanism for an automatic screw fastening device Technical Field

[0001] This invention belongs to the technical field of screw cleaning mechanisms, specifically relating to a screw cleaning mechanism for an automatic screw fastening device. Background Technology

[0002] In automatic screw fastening equipment, the electric screwdriver picks up the screw through an adsorption head, for example, by setting a magnet inside the adsorption head to magnetically attract the screw, so as to realize the handling and fastening of the screw.

[0003] In actual production, if the screw is not precisely attached to the suction head, it may become misaligned or irregular. Alternatively, the screw may remain attached to the suction head even when the equipment is off, requiring removal upon startup. Due to the irregular shape of the screw and the difficulty in clamping it, manual removal is currently the most common method. However, manual screw removal requires checking each suction head individually, which is time-consuming and reduces processing efficiency. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a screw cleaning mechanism for an automatic screw fastening device.

[0005] To achieve the above objectives, the present invention discloses a screw cleaning mechanism for an automatic screw fastening device, comprising a mounting plate and a clamping assembly disposed on the mounting plate; the mounting plate is provided with a discharge through hole; the clamping assembly includes a plurality of rotatable jaws, a synchronous transmission member, and a driving device; the plurality of jaws are distributed circumferentially along the discharge through hole, and each jaw is provided with a clamping portion; the synchronous transmission member is pulsatorically connected to the plurality of jaws, and the driving device drives the synchronous transmission member to move, so that the plurality of jaws synchronously retract into the discharge through hole to clamp the screw, or synchronously open away from the discharge through hole to release the screw.

[0006] In some embodiments, there are one or more feeding through holes; when there are multiple feeding through holes, the multiple feeding through holes are circumferentially spaced, and the number of clamping components is half that of the feeding through holes; each set of clamping components is disposed opposite to a feeding through hole and is located between two adjacent feeding through holes.

[0007] In some embodiments, the synchronous transmission member is annular, and its inner sidewall is provided with a first transmission tooth; a plurality of grippers are rotatably disposed on the mounting plate and located inside the synchronous transmission member, and the grippers are provided with a second transmission tooth that meshes with the first transmission tooth.

[0008] In some embodiments, the gripper is fan-shaped and includes a first radial surface, an outer peripheral surface, and a second radial surface connected in sequence; the outer peripheral surface is an arc surface, one side of the outer peripheral surface is provided with the second transmission tooth, and the other side is a smooth arc surface; the clamping part is formed between the smooth arc surface and the second radial surface, and the second radial surface is adapted to and clearance-fitted with the smooth arc surface of the adjacent gripper.

[0009] In some embodiments, the synchronous transmission member is provided with a transmission handle, and the two ends of the driving device are a mounting part and an output end, respectively. One of the mounting part and the output end is rotatably connected to the mounting plate, and the other is rotatably connected to the transmission handle.

[0010] In some embodiments, the gripper has a pin hole, and the gripper is rotatably connected to the mounting plate by a pin passing through the pin hole.

[0011] In some embodiments, a cover plate is also included, which is connected to the mounting plate and located above the synchronous transmission member, and the cover plate is in a limiting engagement with the top of the synchronous transmission member.

[0012] In some embodiments, the two ends of the pin are respectively located inside the mounting plate and the cover plate.

[0013] In some embodiments, the bottom of the mounting plate is provided with a material drop box.

[0014] Compared with existing technologies, the advantages of this invention are as follows: multiple grippers are distributed circumferentially along the feeding through-hole, and synchronously converge towards the center under the cooperation of the drive device and synchronous transmission components, straightening and clamping the skewed screws. Then, mechanical force is used to remove the screws from the suction head of the automatic screw-locking device, automatically cleaning the screws remaining on the screwdriver assembly. This screw cleaning structure enables the automatic screw-locking device to automatically execute the screw-cleaning process after startup or screw-locking failure, automatically removing the screws that need cleaning without manual intervention, achieving truly unmanned production, avoiding equipment downtime caused by manual screw removal, and effectively improving production efficiency and stability.

[0015] By adjusting the drive device to control the clamping force and opening angle of each gripper, it can adapt to different screw specifications and production scenarios, making it highly versatile.

[0016] The material is fed through a through hole. After the jaws of each clamping component open, the material is fed through the through hole. At the same time, when the screwdriver rod assembly of the automatic screw-locking device moves to this cleaning structure, the material feeding through hole can avoid the screwdriver rod assembly and prevent interference. Attached Figure Description

[0017] Figure 1 is a three-dimensional structural diagram of the screw cleaning mechanism for the automatic screw fastening device of the embodiment; Figure 2 is a three-dimensional exploded structural diagram of the screw cleaning mechanism for the automatic screw fastening device of Figure 1; Figure 3 is a structural diagram of the clamp and synchronous transmission component in Figure 2 in the retracted state; Figure 4 is a structural diagram of the clamp in Figure 3; Figure 5 is a structural diagram of the clamp and synchronous transmission component in Figure 2 in the open state; Mounting plate 100; Discharge through hole 110; Clamping assembly 200; Clamp 210; First radial surface 211; Outer peripheral surface 212; Second transmission tooth 2121; Smooth arc surface 2122; Second radial surface 213; Pin hole 214; Clamping part 215; Synchronous transmission component 220; First transmission tooth 221; Transmission handle 222; Drive device 230; Mounting part 231; Output end 232; Pin 240; Cover plate 300; Discharge box 400. Detailed Implementation

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] A screw cleaning mechanism for an automatic screw fastening device, as shown in Figures 1-5, includes a mounting plate 100 and a clamping assembly 200 disposed on the mounting plate 100, the clamping assembly 200 being capable of clamping screws on the suction head.

[0020] In some embodiments, the mounting plate 100 is provided with a discharge through hole 110, which is a circular hole. The diameter of the discharge through hole 110 is larger than the outer diameter of the suction head of the automatic screw fastening device, allowing the suction head to extend through the discharge through hole 110. In other words, the discharge through hole 110 can avoid the suction head, preventing the suction head from interfering with the mounting plate 100 during screw cleaning. At the same time, after the grippers 210 of the clamping assembly 200 open, the screws are dropped through the discharge through hole 110, facilitating subsequent screw collection.

[0021] The clamping assembly 200 includes multiple rotatable jaws 210, a synchronous transmission member 220, and a drive device 230. The multiple jaws 210 are distributed circumferentially along the unloading through-hole 110, and each jaw 210 has a clamping portion 215. The synchronous transmission member 220 is connected to the multiple jaws 210, and the drive device 230 drives the synchronous transmission member 220 to move, causing the multiple jaws 210 to synchronously retract towards the center of the unloading through-hole 110 to clamp the screw, or synchronously open away from the center of the through-hole 110 to release the screw.

[0022] The clamping assembly 200, in conjunction with the drive device 230 and the synchronous transmission component 220, synchronously converges towards the center, straightening and clamping the misaligned screws. Then, mechanical force removes the screws from the suction head of the automatic screw-locking device, automatically cleaning any remaining screws from the screwdriver assembly. This screw-cleaning structure enables the automatic screw-locking device to automatically execute the screw-cleaning process upon startup or after a locking failure, automatically removing the screws that need cleaning without manual intervention. This achieves truly unmanned production, avoiding machine downtime caused by manual screw removal and effectively improving production efficiency and stability. By adjusting the drive device 230 to control the clamping force and opening angle of each gripper 210, it adapts to different screw specifications and production scenarios, offering strong versatility.

[0023] The mechanical force can be, in the automatic screw-locking mechanism, a suction mechanism consisting of multiple suction heads that can move up and down. When the screw on the suction head is clamped, the suction mechanism moves upward, and the mechanical force generated therefrom can cause the screw to detach from the suction head.

[0024] In some embodiments, the automatic screw-locking device has multiple suction heads, which are arranged on a turntable to form a turntable-type suction mechanism. For example, the multi-suction-head screw-locking robot disclosed in application number CN201611217016.3 uses this suction mechanism, which has eight suction heads. Correspondingly, there are eight discharge through holes 110, arranged one-to-one along the circumferential direction, allowing each suction head to extend through the discharge through hole 110. There are four sets of clamping assemblies 200, each set of clamping assemblies 200 being positioned opposite a discharge through hole 110 and between two adjacent discharge through holes 110.

[0025] Because the existing rotary suction mechanism has a small spacing between two adjacent suction heads, if a clamping component 200 is installed in each discharge through-hole 110, the spacing between the suction heads would need to be larger, which cannot meet the characteristics of a small suction head spacing and a compact suction mechanism structure. Therefore, the number of clamping components 200 is set to half the number of discharge through-holes 110. Each set of clamping components 200 is located between two adjacent discharge through-holes 110, without requiring additional installation space or modification to the original suction head spacing and rotary main structure. It perfectly adapts to the existing compact rotary suction mechanism and can be directly and seamlessly integrated into the existing 8-station suction head equipment, exhibiting extremely strong compatibility. In use, the four sets of clamping components 200 first clean the screws of four suction heads. Since the mounting plate 100 has eight discharge through-holes 110, the other four discharge through-holes 110 can avoid the remaining four sets of suction heads. After cleaning the first four suction heads, the rotary table rotates to clean the remaining four suction heads.

[0026] In some embodiments, the synchronous transmission member 220 is annular, with its inner sidewall being a circular surface and having first transmission teeth 221 continuously arranged in the circumferential direction. There are five grippers 210, which are rotatably mounted on the mounting plate 100 and located within the synchronous transmission member 220. The rotation axes of the five grippers 210 are located in the same radial region. Each gripper 210 has a second transmission tooth 2121 that meshes with the first transmission tooth 221. Through the aforementioned synchronous transmission member 220, the continuously arranged first transmission teeth 221 can simultaneously drive the second transmission teeth 2121 of all grippers 210, ensuring that the rotation angle, rotation speed, and clamping force of all grippers 210 are completely consistent. This completely solves the problems of asynchronous movement, jamming, and clamping deviation of multiple grippers 210, achieving stable circumferential clamping even when facing screws with skewed or irregular postures. After the five grippers 210 are rotatably connected to the mounting plate, the second transmission tooth 2121 of each gripper 210 can horizontally limit and center the synchronous transmission component 220 in the opposite direction, eliminating the need for an assembly structure for the synchronous transmission component 220, resulting in a simpler and more compact structure. Furthermore, since the synchronous transmission component 220 has no other constraints, and there is a gap between the teeth of the synchronous transmission component 220 and the corresponding five grippers 210, the synchronous transmission component 220 experiences rotational resistance when driven, resulting in fast transmission response, low operating noise, and significantly improved operational stability.

[0027] In some embodiments, the gripper 210 is fan-shaped, comprising a first radial surface 211, an outer peripheral surface 212, and a second radial surface 213 connected in sequence. The first radial surface 211 is close to the inner wall of the synchronous transmission member 220, while the second radial surface 213 is relatively far away. The rotation axis of the gripper 210 is near the intersection of the first radial surface 211 and the second radial surface 213. The outer peripheral surface 212 is an arc surface, with the aforementioned second transmission tooth 2121 on one side and a smooth arc surface 2122 on the other side. The smooth arc surface 2122 has the same curvature as the second radial surface 213, and the aforementioned clamping portion is formed between the smooth arc surface 2122 and the second radial surface 213. The second radial surface 213 is adapted to and clearance-fitted with the smooth arc surface 2122 of the adjacent gripper 210 to ensure smooth rotation of both.

[0028] The design of the gripper 210, with its smooth arc surface 2122 having the same curvature as the second radial surface 213, and the second radial surface 213 matching and having a clearance fit with the smooth arc surface 2122 of the adjacent gripper 210, provides auxiliary guidance and limitation for the rotation of each gripper 210. The mating surfaces of adjacent grippers 210 can limit the radial movement of the gripper 210, further improving the coaxiality and accuracy of the gripper 210 rotation and avoiding meshing failure and clamping misalignment caused by the wobble of the gripper 210. At the same time, the clearance fit between the two grippers 210 ensures that there is no hard friction or jamming between adjacent grippers 210 during rotation, resulting in smooth and noiseless operation. It also ensures that when the grippers 210 are fully retracted, the mating surfaces of adjacent grippers 210 form a seamless connection with minimal clearance, preventing screws from slipping out of the gap between the grippers 210 and further enhancing clamping reliability. In addition, this mating structure allows multiple grippers 210 to be arranged in a tight circumferential arrangement without redundancy. No additional clearance space is required between adjacent grippers 210, maximizing the use of circumferential installation space. It perfectly matches the characteristics of the rotary suction mechanism, such as small spacing between adjacent suction heads and compact structure, and can be integrated and installed without changing the original equipment layout.

[0029] The gripper 210 has a pin hole 214, and the gripper 210 is rotatably connected to the mounting plate 100 by a pin 240 passing through the pin hole 214.

[0030] In some embodiments, the synchronous transmission member 220 is provided with a transmission handle 222, and the driving device 230 is a telescopic cylinder, such as a pneumatic cylinder, with a mounting part 231 and an output end 232 at its two ends, respectively. The mounting part 231 and the output end 232 are rotatably connected to the mounting plate 100 and the transmission handle 222, respectively. In use, the piston rod of the pneumatic cylinder extends or retracts to push / pull the transmission handle 222, causing the synchronous transmission member 220 to rotate, thereby causing the corresponding five grippers 210 to rotate synchronously and close or open.

[0031] In some embodiments, the screw cleaning mechanism further includes a cover plate 300, which is connected to the mounting plate 100 and located above the synchronous transmission member 220. The cover plate 300 is in a limiting fit with the top of the synchronous transmission member 220. By providing the cover plate 300, the synchronous transmission member 220 can be constrained in the vertical direction, and the gripper 210, especially the transmission part between the gripper 210 and the synchronous transmission member 220, can be protected, thereby improving the reliability of the structure and the service life of the mechanism. Furthermore, the two ends of the aforementioned pin 240 are respectively located within the mounting plate 100 and the cover plate 300, which improves the assembly stability of the pin 240.

[0032] Understandably, the cover plate 300 is provided with a through hole corresponding to the material discharge through hole.

[0033] In some embodiments, the bottom of the mounting plate 100 is provided with a dropping box 400. After the clamping assembly 200 clamps the screw, the claws 210 open, and the screw falls into the dropping box 400, which facilitates the subsequent collection of the screw.

[0034] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A screw cleaning mechanism for an automatic screw fastening device, characterized in that: The device includes a mounting plate and a clamping assembly disposed on the mounting plate; the mounting plate has a discharge through hole; the clamping assembly includes multiple rotatable jaws, a synchronous transmission component, and a driving device; the multiple jaws are distributed circumferentially along the discharge through hole, and each jaw has a clamping portion; the synchronous transmission component is pulsatorically connected to the multiple jaws, and the driving device drives the synchronous transmission component to move, so that the multiple jaws synchronously retract into the discharge through hole to clamp the screw, or synchronously open away from the discharge through hole to release the screw.

2. The screw cleaning mechanism for the automatic screw fastening device according to claim 1, characterized in that: There are one or more feeding through holes; when there are multiple feeding through holes, the multiple feeding through holes are circumferentially spaced, and the number of clamping components is half of the feeding through holes; each set of clamping components is arranged opposite to a feeding through hole and is located between two adjacent feeding through holes.

3. The screw cleaning mechanism for the automatic screw fastening device according to claim 1, characterized in that: The synchronous transmission component is annular, and its inner sidewall is provided with a first transmission tooth; a plurality of grippers are rotatably mounted on the mounting plate and located inside the synchronous transmission component, and the grippers are provided with a second transmission tooth that meshes with the first transmission tooth.

4. The screw cleaning mechanism for the automatic screw fastening device according to claim 3, characterized in that: The gripper is fan-shaped and includes a first radial surface, an outer peripheral surface, and a second radial surface connected in sequence. The outer peripheral surface is an arc surface, with the second transmission tooth on one side and a smooth arc surface on the other side. The gripping part is formed between the smooth arc surface and the second radial surface, and the second radial surface is adapted to and has a clearance fit with the smooth arc surface of the adjacent gripper.

5. The screw cleaning mechanism for the automatic screw fastening device according to claim 3, characterized in that: The synchronous transmission component is provided with a transmission handle. The two ends of the driving device are a mounting part and an output end, respectively. One of the mounting part and the output end is rotatably connected to the mounting plate, and the other is rotatably connected to the transmission handle.

6. The screw cleaning mechanism for the automatic screw fastening device according to claim 3, characterized in that: The gripper has a pin hole, and the gripper is rotatably connected to the mounting plate by a pin that passes through the pin hole.

7. The screw cleaning mechanism for the automatic screw fastening device according to claim 6, characterized in that: It also includes a cover plate, which is connected to the mounting plate and located above the synchronous transmission member, and the cover plate is in a limiting engagement with the top of the synchronous transmission member.

8. The screw cleaning mechanism for the automatic screw fastening device according to claim 7, characterized in that: The two ends of the pin are respectively located inside the mounting plate and the cover plate.

9. The screw cleaning mechanism for the automatic screw fastening device according to claim 1, characterized in that: The mounting plate has a material drop box at its bottom.

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