An automatic screw assembly machine

Abstract

This utility model discloses an automatic screw assembly machine, including a frame, a workpiece rotary table, a screw position marking component, a screw alignment component, a washer assembly component, a nut pre-assembly component, a nut tightening component, a vibrating feeder plate 1, a vibrating feeder plate 2, a linear feeder plate 1, a linear feeder plate 2, a feeding component, and a clamp. The workpiece rotary table is horizontally positioned above the frame; the screw alignment component, washer assembly component, nut pre-assembly component, and nut tightening component are vertically arranged around the workpiece rotary table; the vibrating feeder plate 1 is used to place washers and feed them to the washer assembly component; the vibrating feeder plate 2 is used to place nuts and feed them to the nut pre-assembly component. This automatic screw assembly machine has a simple and reasonable structural design, stable and smooth operation; high positioning and assembly accuracy of screws, washers, and nuts, facilitating the connection of washers, nuts, and screws; high assembly efficiency; and long service life.

Description

Technical Field

[0001] This utility model relates to the field of screw machine technology, and in particular to an automatic screw assembly machine. Background Technology

[0002] In modern manufacturing, the assembly of screws and nuts is a crucial step in the product manufacturing process, widely used in electronic equipment, automotive parts, home appliances, and many other fields. With the development of automation technology, various screw-making machines (including screw tightening machines and nut assembly machines) have gradually replaced manual operation, becoming important equipment for improving production efficiency and ensuring assembly consistency.

[0003] In existing technologies, screw-picking machines typically use mechanical grippers or pneumatic adsorption to grasp and transfer nuts. Mechanical grippers hold nuts by opening and closing mechanical structures, but for small, lightweight nuts (such as those smaller than M2), the gripping accuracy is difficult to guarantee, and improper gripping force control can easily lead to nut deformation or slippage. Pneumatic adsorption relies on suction force generated by negative pressure to grasp nuts, which is greatly affected by the stability of the air source. Adsorption failure is prone to occur in high-speed assembly scenarios, and it also requires a high degree of surface flatness of the nut, resulting in poor adaptability.

[0004] To address the aforementioned issues, magnetic nut gripping mechanisms have been increasingly adopted in screw-pressing machines. These mechanisms utilize magnetic force to attract ferromagnetic nuts, offering advantages such as simple structure, rapid response, and minimal damage to the nuts. However, existing magnetic screw-pressing machines still suffer from the following shortcomings: limited positioning accuracy, lack of effective alignment detection mechanisms in some devices, and a tendency for nuts to shift when transferred to the assembly station, affecting assembly quality.

[0005] Therefore, in view of the shortcomings of existing screw-picking machines in terms of nut gripping stability and positioning accuracy, there is an urgent need to develop a magnetic screw-picking machine that can improve assembly positioning accuracy and adapt to nuts of various specifications, so as to meet the needs of modern manufacturing industry for efficient, stable and flexible assembly. Utility Model Content

[0006] The purpose of this utility model is to provide an automatic screw assembly machine with a simple and reasonable structural design, stable and smooth operation; high positioning and assembly accuracy of screws, washers and nuts, and convenient connection of washers, nuts and screws.

[0007] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0008] An automatic screw assembly machine includes a frame, a workpiece rotary table, a screw position marking assembly, a screw alignment assembly, a washer assembly assembly, a nut pre-assembly assembly, a nut tightening assembly, a vibrating feeder 1, a vibrating feeder 2, a linear feeder 1, a linear feeder 2, a discharge assembly, and a fixture.

[0009] A workpiece rotating disk is horizontally positioned above the frame, and several workpiece limiting disks are evenly distributed on the rotating disk (eight are shown in the illustration). These workpiece limiting disks are used to place and limit the workpieces to be assembled, such as the lower and upper housings of a motor. The lower and upper housings are connected and fixed using screws, nuts, and washers. The lower housing, upper housing, and screws are placed inside the workpiece limiting disks. The screws pass through through holes in the lower and upper housings, with their tops protruding from the through hole in the upper housing, exposing the threaded section. The workpiece limiting disks have an opening at the top and a cavity in the middle, within which the assembled lower housing, upper housing, and screws are placed.

[0010] The frame is horizontally positioned with a worktable on top. An indexer is mounted on the worktable, and a turntable motor is located below it. The output shaft of the turntable motor is connected to the indexer, and the output shaft of the indexer is connected to the turntable. The turntable rotates by a fixed angle each time, driven by the motor and the indexer. For example, with eight workpiece limiting discs, 360 degrees divided by 8 equals 45 degrees per rotation.

[0011] The workpiece rotary table is vertically equipped with a screw alignment assembly, a washer assembly assembly, a nut pre-assembly assembly, and a nut tightening assembly. The washer assembly assembly has a vibrating feeder and a linear feeder at its front end; the vibrating feeder is used to place washers and supply them to the washer assembly assembly. The nut pre-assembly assembly has a vibrating feeder and a linear feeder at its front end; the vibrating feeder is used to place nuts and supply them to the nut pre-assembly assembly.

[0012] The screw position marking component is located on one side of the screw alignment component. It includes a stand, a mounting plate, and laser emitters. The stand is vertically mounted on the frame, and the mounting plate is horizontally fixed to the top of the stand and directly above the workpiece positioning disc. Several laser emitters are used, their number matching the number of screws on the workpiece, and they are vertically fixed to the outer edge of the mounting plate. The laser emitters generate highly stable, highly collimated laser beams (usually red or green visible laser light for easy observation) as a measurement reference line. The workpiece is placed in the cavity of the workpiece positioning disc, and its position is adjusted by rotation until the screws on the workpiece are aligned with the laser spot emitted by the laser emitter. This establishes the reference position of the screws, providing a reference and positioning for subsequent assembly processes.

[0013] The screw alignment assembly is used to adjust slightly tilted screws to make them vertical; or it is used to detect whether there are tilted screws on the workpiece. If so, the workpiece is rotated at a large angle to the unloading assembly, which then removes it from the equipment.

[0014] The screw alignment assembly includes a vertical beam, a guide rail, a slider, an alignment cylinder, a carriage, and a screw sleeve. The vertical beam is vertically mounted on the frame, with its inner side connected to the vertically mounted guide rail. The slider is fitted onto the guide rail, and the carriage is fixed onto the slider. The alignment cylinder is vertically mounted on the vertical beam, and its output shaft is connected to the carriage, driving the carriage to move up and down. A vertically mounted screw sleeve is located at the bottom of the carriage, with a cavity at its bottom that matches the screw diameter. When the carriage moves down and presses against the workpiece, the cavity of the screw sleeve fits onto the outer wall of the screw. If a screw on the workpiece is tilted, the screw cannot be inserted into the screw sleeve, and the carriage will not descend to its intended stroke, sending a signal to the control system to move the workpiece directly to the unloading assembly. If the screw sleeve moves down until its bottom end touches the workpiece surface, the upper end of the screw is inserted into the cavity of the screw sleeve, indicating that the screw is vertical, providing a good position for subsequent assembly of washers and nuts.

[0015] The gasket assembly includes a second vertical beam, a second synchronous belt linear module, a second lifting cylinder, and pneumatic fingers. The second vertical beam is vertically arranged, with the second synchronous belt linear module horizontally mounted on it. The second lifting cylinder is vertically arranged and slidably connected to the second synchronous belt linear module. Its output shaft is connected to a horizontally arranged mounting frame, and the bottom of the mounting frame has several pneumatic fingers. The pneumatic fingers are used to grip the outer edge of the gasket to pick it up and place it on the screw. Briefly: The second synchronous belt linear module indirectly drives the pneumatic fingers to move above the first linear feeder. The second lifting cylinder pushes the second mounting frame downward, causing the pneumatic fingers to grip the outer edge of the gasket. Then, the second synchronous belt linear module indirectly drives the pneumatic fingers to move above the workpiece and place the gasket on the screw.

[0016] The nut pre-assembly assembly includes a vertical beam (3), a synchronous belt linear module (3), a lifting cylinder (4), and a magnetic suction assembly. The vertical beam (3) is vertically positioned, with the synchronous belt linear module (3) horizontally mounted on top of it. The lifting cylinder (4) is vertically positioned and slidably connected to the synchronous belt linear module (3). Its output shaft is connected to a horizontally positioned mounting frame (3), which has several magnetic suction assemblies. Each magnetic suction assembly includes an electromagnet and a screwdriver bit. The screwdriver bit is vertically positioned and has a recessed cavity at its bottom that matches the shape of the nut, typically an internal hexagonal cavity. The electromagnet is fixed to the mounting frame (3), and its bottom is connected to the screwdriver bit. The screwdriver bit attracts the nut from the linear feeder (2), and then places the nut onto the top of the screw. The energization and de-energization of the electromagnet control the screwdriver bit's attraction and release of the nut.

[0017] The nut tightening assembly includes a fourth upright frame, a fourth lifting cylinder, a lifting base, a tightening motor, a connecting rod, and a second screwdriver bit. The fourth upright frame is vertically fixed to the machine frame, and the fourth lifting cylinder is vertically fixed to its top. Its output shaft is connected to the lifting base, driving the lifting base to move up and down. There are several tightening motors, which are vertically fixed to the lifting base. Their output shafts are connected to vertically arranged connecting rods, and the bottom of the connecting rods is connected to the second screwdriver bit. The second screwdriver bit has the same structure as the screwdriver bit.

[0018] The unloading assembly is used to clamp the workpiece and remove it from the workpiece rotary table. The unloading assembly includes a vertical beam, a synchronous belt linear module, a lifting cylinder, and a clamping cylinder; the unloading assembly is conventional prior art and will not be described in detail here.

[0019] The beneficial effects of this utility model are:

[0020] Its structural design is simple and reasonable, and its operation is stable and smooth; the positioning and assembly accuracy of screws, washers and nuts is high, and it is convenient to connect washers, nuts and screws; it has high assembly efficiency and long service life. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of an automatic screw assembly machine according to the present invention;

[0022] Figure 2 This is a top view of an automatic screw assembly machine according to the present invention;

[0023] Figure 3 A schematic diagram showing the workpiece being placed into the workpiece positioning disc;

[0024] Figure 4 A structural diagram of the screw position marking assembly;

[0025] Figure 5 This is a schematic diagram of the screw alignment assembly.

[0026] Figure 6 This is a schematic diagram of the structure of a linear feeder.

[0027] Figure 7 for Figure 6 A magnified view of a portion of the image;

[0028] Figure 8 A schematic diagram of the pre-assembled nut assembly;

[0029] Figure 9 Bottom view of the nut pre-assembled assembly;

[0030] Figure 10 This is a schematic diagram of the nut tightening assembly.

[0031] Figure 11 This is a structural diagram of the feeding assembly;

[0032] Figure 12 This is a schematic diagram of the nut lifting mechanism and a structural schematic diagram of the nut lifting device. Detailed Implementation

[0033] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0034] like Figures 1-12 As shown, an automatic screw assembly machine includes a frame 1, a workpiece rotary table 2, a screw position marking assembly 3, a screw alignment assembly 4, a washer assembly assembly 5, a nut pre-assembly assembly 6, a nut tightening assembly 7, a vibrating feeder 1 8, a vibrating feeder 2 9, a linear feeder 1 10, a linear feeder 2 11, a feeding assembly 12, and a clamp 13.

[0035] A workpiece rotating disk 2 is horizontally positioned above the frame 1. Several workpiece limiting disks 21 are evenly distributed on the workpiece rotating disk 2, eight of which are shown in the diagram. The workpiece limiting disks 21 are used to place and limit the workpieces 100 to be assembled, such as the lower housing 200 and upper housing 300 of a motor. The lower housing and upper housing 300 are connected and fixed using screws 400, nuts 500, and washers 600. The lower housing, upper housing 300, and screws 400 are placed inside the workpiece limiting disks 21. The screws 400 pass through through holes in the lower housing and upper housing 300, with their tops protruding from the through hole in the upper housing 300, exposing the threaded section. The workpiece limiting disks 21 have an opening at the top and a cavity in the middle. The lower housing 200, upper housing 300, and screws 400 are assembled and placed within the cavity.

[0036] The frame 1 is horizontally positioned, with a worktable 14 on top. An indexer 15 is mounted on the worktable 14, and a turntable motor 16 is mounted below it. The output shaft of the turntable motor 16 is connected to the indexer 15, and the output shaft of the indexer 15 is connected to the turntable. The turntable rotates by a fixed angle each time, driven by the motor and the indexer 15. For example, if eight workpiece limiting discs 21 are set, then 360 degrees divided by 8 equals 45 degrees per rotation.

[0037] The workpiece rotary disk 2 is vertically surrounded by a screw alignment assembly 4, a washer assembly assembly 5, a nut pre-assembly assembly 6, and a nut tightening assembly 7. The washer assembly assembly 5 has a vibrating feeder 8 and a linear feeder 10 at its front end. The vibrating feeder 8 is used to place washer 600 and feed washer 600 to the washer assembly assembly 5. The nut pre-assembly assembly 6 has a vibrating feeder 9 and a linear feeder 11 at its front end. The vibrating feeder 9 is used to place nut 500 and feed nut 500 to the nut pre-assembly assembly 6.

[0038] The screw position marking component 3 is located on one side of the screw alignment component 4. It includes a stand 31, a mounting plate 32, and a laser emitter 33. The stand 31 is vertically mounted on the frame 1, and the mounting plate 32 is horizontally fixed to the top of the stand 31 and directly above the workpiece positioning disc 21. Several laser emitters 33 are used, their number matching the number of screws 400 on the workpiece 100. They are vertically fixed to the outer edge of the mounting plate 32. The laser emitter generates a highly stable and highly collimated laser beam (usually red or green visible laser for easy observation) as a measurement reference line. The workpiece is placed in the cavity of the workpiece positioning disc 21, and the position of the workpiece 100 is adjusted by rotation until the screws 400 on the workpiece 100 are aligned with the laser spot emitted by the laser emitter. This serves as the reference position for the screws 400, establishing a reference and positioning for subsequent assembly processes.

[0039] The screw alignment component 4 is used to detect whether there are tilted screws 400 on the workpiece. If so, the workpiece 100 is rotated directly to the unloading component 12 at a large angle, and the unloading component 12 removes it from the equipment. The screw alignment component 4 can also be used to adjust slightly tilted screws 400 so that the screws 400 are in a vertical and upright state.

[0040] The screw alignment assembly 4 includes a vertical beam 41, a guide rail 42, a slider 43, an alignment cylinder 44, a slide 45, and a screw sleeve 46. The vertical beam 41 is vertically mounted on the frame 1, with its inner side attached to the vertically mounted guide rail 42. The slider 43 is fitted onto the guide rail 42, and the slide 45 is fixed onto the slider 43. The alignment cylinder 44 is vertically mounted on the vertical beam 41, and its output shaft is connected to the slide 45, driving the slide 45 to move up and down. The bottom of the slide 45 has a vertically mounted screw sleeve 46, and the bottom of the screw sleeve 46 has a cavity 461, the diameter of which matches the diameter of the screw 400. When the slide 45 moves down and presses against the workpiece 100, the cavity 461 of the screw sleeve 46 fits onto the outer wall of the screw 400. If the screw 400 on the workpiece 100 is tilted, the screw 400 cannot be inserted into the screw sleeve 46, and the slide 45 will not descend to the required stroke. The system will be given a signal to move the workpiece 100 directly to the unloading assembly 12. If the screw sleeve 46 moves down to the point where its bottom end is in contact with the surface of the workpiece 100, the upper end of the screw 400 is inserted into the cavity 461 of the screw sleeve 46. This also indicates that the screw 400 is in a vertical state, providing a good condition for the subsequent assembly of the washer and nut 500.

[0041] The gasket assembly 5 includes a second upright beam 41, a second synchronous belt linear module, a second lifting cylinder, and pneumatic fingers. The second upright beam 41 is vertically arranged, with the second synchronous belt linear module horizontally mounted on it. The second lifting cylinder is vertically arranged and slidably connected to the second synchronous belt linear module. Its output shaft is connected to a horizontally arranged mounting frame 2, and the bottom of the mounting frame 2 is provided with several pneumatic fingers. The pneumatic fingers are used to grip the outer edge of the gasket to pick it up and place the gasket onto the screw 400. Brief description: The second synchronous belt linear module indirectly drives the pneumatic fingers to move above the linear feeder 10. The second lifting cylinder pushes the second mounting frame 2 downward, causing the pneumatic fingers to grip the outer edge of the gasket. Then, the second synchronous belt linear module indirectly drives the pneumatic fingers to move above the workpiece, placing the gasket 600 onto the screw 400.

[0042] The nut pre-assembly assembly 6 includes a vertical beam 61, a synchronous belt linear module 62, a lifting cylinder 72, and a magnetic attraction assembly 64. The vertical beam 61 is vertically positioned, with the synchronous belt linear module 62 horizontally mounted on it. The lifting cylinder 72 is vertically positioned and slidably connected to the synchronous belt linear module 62. Its output shaft is connected to a horizontally positioned mounting frame 65, which has several magnetic attraction assemblies 64. Each magnetic attraction assembly 64 includes an electromagnet 641 and a screwdriver bit 642. The screwdriver bit 642 is vertically positioned, with a recessed cavity at its bottom that matches the shape of the nut 500, typically an internal hexagonal cavity. The electromagnet 641 is fixed to the mounting frame 65, and its bottom is connected to the screwdriver bit 642. The screwdriver bit 642 attracts the nut 500 from the linear feeder 11 and then places the nut 500 onto the top of the screw 400. The screwdriver bit 642 picks up and releases the nut 500 by energizing and de-energizing the electromagnet 641.

[0043] The nut tightening assembly 7 includes a fourth upright frame 71, a fourth lifting cylinder 72, a lifting seat 73, a tightening motor 74, a connecting rod 75, and a second screwdriver bit 76. The fourth upright frame 71 is vertically fixed on the frame 1, and the fourth lifting cylinder 72 is vertically fixed on its top. Its output shaft is connected to the lifting seat 73, driving the lifting seat 73 to move up and down. There are several tightening motors 74, which are vertically fixed on the lifting seat 73. Their output shafts are connected to the vertically arranged connecting rods 75. The bottom of the connecting rods 75 is connected to the second screwdriver bit 76, and the tightening motors 74 indirectly drive the second screwdriver bit 76 to rotate. The second screwdriver bit 76 has the same structural shape as the screwdriver bit 642.

[0044] The unloading assembly 12 is used to clamp the workpiece and remove it from the workpiece rotary table 2. The unloading assembly 12 includes a vertical beam 121, a synchronous belt linear module 122, a lifting cylinder 123, and a clamping cylinder 124. The unloading assembly 12 is conventional prior art and will not be described in detail here.

[0045] Preferably, to facilitate fixing the workpiece 100 (during the assembly of the gasket 600 and nut 500) and prevent the workpiece 100 from shaking, a disc 80 is provided in the middle of the frame 1, and three clamps 13 are provided on the disc. The clamps 13 include a clamping cylinder 131 and a clamping block 132. The clamping cylinder 131 is horizontally arranged, and its output shaft is connected to the clamping block 132. When the clamping block 132 is pushed out, it presses against the workpiece 100, so that the workpiece 100 is fixed in the workpiece limiting disc 21.

[0046] Preferably, the tail end of the linear feeder 10 is provided with a clearance groove 81 to facilitate the insertion of pneumatic fingers into the clamping pad 600.

[0047] Preferably, the tail end of the linear feeder 2 11 is provided with a nut lifting device 91, which facilitates the bit 642 to pick up and absorb the nut 500. The nut lifting device 91 includes a lifting cylinder 92 and a push rod 93. The lifting cylinder 92 is vertically arranged, and its output shaft is connected to the push rod 93, which is located at the discharge port at the tail end of the linear feeder 2 11.

[0048] Briefly describe its working principle:

[0049] The workpiece rotary table 2 is equipped with a loading station. The lower and upper housings 300 of the motor are manually assembled, and the screw 400 is inserted into the through holes on the lower and upper housings 300, with the top of the screw 400 protruding from the through hole of the upper housing 300, exposing the threaded section. The above-mentioned "workpiece" (the combination of the lower housing, upper housing 300, and screw 400) is placed in the workpiece limiting disc 21; the position of the workpiece is adjusted by rotation so that the screw 400 on the workpiece is aligned with the light spot emitted by the laser emitter; the screw alignment component 4 is pressed down to pre-assemble the screw sleeve 46 with the screw 400, and the position of the screw 400 and its verticality are tested, and whether it can be smoothly assembled with the nut 500 is tested. If the screw sleeve 46 can be smoothly inserted into the screw 400, the position and condition of the screw 400 meet the standards. The workpiece rotates with the workpiece rotary table 2 and enters the next station. The washer assembly assembly 5 places the washer 600 on the screw 400; the nut pre-assembly assembly 6 places the nut 500 on top of the screw 400; the nut tightening assembly 7 drives the nut 500 to rotate and move downward, so that the nut 500 is tightened on the screw 400, thereby connecting and fastening the lower shell and upper shell 300 with the screw 400, washer 600, and nut 500. Subsequently, the assembled workpiece is removed by the unloading assembly 12.

[0050] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and alterations to these embodiments without departing from the principles and spirit of this utility model will still fall within the protection scope of this utility model.

Claims

1. An automatic screw assembly machine characterized by: Includes frame, workpiece rotary table, screw position marking assembly, screw alignment assembly, washer assembly assembly, nut pre-assembly assembly, nut tightening assembly, vibrating feeder 1, vibrating feeder 2, linear feeder 1, linear feeder 2, unloading assembly, and fixture; A workpiece rotating disk is horizontally arranged above the frame, and a number of workpiece limiting disks are evenly distributed on the workpiece rotating disk; the workpiece limiting disks have an opening at the upper end and a cavity in the middle. The frame is horizontally arranged, with a worktable on top, an indexer on the worktable, and a turntable motor below the worktable. The output shaft of the turntable motor is connected to the indexer, and the output shaft of the indexer is connected to the turntable. The workpiece rotary disk is vertically equipped with a screw alignment assembly, a washer assembly assembly, a nut pre-assembly assembly, and a nut tightening assembly. The front end of the gasket assembly is provided with a vibrating feeding plate and a linear feeder. The vibrating feeding plate is used to place the gasket and feed the gasket to the gasket assembly assembly. The front end of the nut pre-assembly assembly is provided with a vibrating feeding plate and a linear feeder. The vibrating feeding plate is used to place the nut and feed the nut to the nut pre-assembly assembly.

2. The automatic assembly screw machine according to claim 1, characterized in that: The screw position marking component is located on one side of the screw alignment component. It includes a stand, a mounting plate, and a laser emitter. The stand is vertically mounted on the frame, and the mounting plate is horizontally fixed to the top of the stand and directly above the workpiece limiting disc. There are several laser emitters, which are vertically fixed to the outer edge of the mounting plate.

3. The automatic assembly screw machine according to claim 1, characterized in that: The screw alignment assembly includes a vertical beam, a guide rail, a slider, an alignment cylinder, a slide, and a screw sleeve. The vertical beam is vertically mounted on the frame, with its inner side attached to the vertically mounted guide rail. The slider is mounted on the guide rail, and the slide is fixed to the slider. The alignment cylinder is vertically mounted on the vertical beam, and its output shaft is connected to the slide, driving the slide to move up and down. The bottom of the slide has a vertically mounted screw sleeve with a cavity at the bottom, the cavity diameter matching the screw diameter.

4. The automatic assembly screw machine according to claim 1, characterized in that: The gasket assembly includes a second upright beam, a second synchronous belt linear module, a second lifting cylinder, and pneumatic fingers; the second upright beam is vertically arranged, and the second synchronous belt linear module is horizontally arranged on it; the second lifting cylinder is vertically arranged and slidably connected to the second synchronous belt linear module, and its output shaft is connected to a horizontally arranged mounting frame, and the bottom of the mounting frame is provided with several pneumatic fingers. Pneumatic fingers are used to grip the outer edge of the washer to pick it up and place it onto the screw.

5. The automatic assembly screw machine according to any one of claims 1-4, characterized in that: The nut pre-assembly assembly includes a vertical beam three, a synchronous belt linear module three, a lifting cylinder four, and a magnetic attraction assembly; the vertical beam three is vertically arranged, and the synchronous belt linear module three is horizontally arranged on it; the lifting cylinder four is vertically arranged and slidably connected to the synchronous belt linear module three, and its output shaft is connected to the horizontally arranged mounting frame three, which is provided with several magnetic attraction assemblies. The magnetic attraction assembly includes an electromagnet and a bit. The bit is vertically positioned and has a recess at its bottom that matches the shape of the nut. The electromagnet is fixed on the mounting bracket three, and the bottom of the bracket is connected to the bit.

6. The automatic screw machine of claim 5, wherein: The nut tightening assembly includes a fourth upright frame, a fourth lifting cylinder, a lifting seat, a tightening motor, a connecting rod, and a second screwdriver bit. The fourth upright frame is vertically fixed on the machine frame, and the fourth lifting cylinder is vertically fixed on its top. Its output shaft is connected to the lifting seat, driving the lifting seat to move up and down. There are several tightening motors, which are vertically fixed on the lifting seat. Their output shafts are connected to vertically arranged connecting rods, and the bottom of the connecting rods is connected to the second screwdriver bit. The tightening motors indirectly drive the second screwdriver bit to rotate. The structure of bit two is the same as that of bit one.

7. The automatic screw machine of claim 6, wherein: The feeding assembly includes five vertical beams, five synchronous belt linear modules, five lifting cylinders, and five clamping cylinders.

8. The automatic screw machine of claim 5, wherein: The frame has a disc in the middle, and the disc has three clamps. The fixture includes a clamping cylinder and a pressure block. The clamping cylinder is horizontally positioned, and its output shaft is connected to the pressure block. When the pressure block is pushed out, it presses against the workpiece, fixing the workpiece within the workpiece limiting disc.

9. The automatic screw installing machine according to claim 5, characterized in that: The tail end of the linear feeder is provided with a clearance groove.

10. The automatic screw assembly machine according to claim 5, characterized in that: The tail end of the linear feeder 2 is equipped with a nut lifting device, which facilitates the screwdriver bit to put on and absorb the nut; the nut lifting device includes a lifting cylinder and a push rod; the lifting cylinder is vertically set, and its output shaft is connected to the push rod, which is located at the discharge port at the tail end of the linear feeder 2.

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