CN212823821U

CN212823821U - Vacuum adsorption mechanism and screw locking device

Info

Publication number: CN212823821U
Application number: CN202021503247.2U
Authority: CN
Inventors: 李亮; 何庆珍
Original assignee: Shanghai Kelai Luojin Electrical And Mechanical Automation Engineering Co ltd; Shanghai Kelai Shengluo Automation Equipment Co ltd; SHANGHAI KELAI ELECTROMECHANICAL AUTOMATION ENGINEERING CO LTD
Current assignee: Shanghai aokewei Intelligent Equipment Co.,Ltd.; SHANGHAI KELAI ELECTROMECHANICAL AUTOMATION ENGINEERING Co.,Ltd.; SHANGHAI KELAI SHENGLUO AUTOMATION EQUIPMENT Co.,Ltd.
Priority date: 2020-07-27
Filing date: 2020-07-27
Publication date: 2021-03-30
Anticipated expiration: 2030-07-27

Abstract

The utility model belongs to the technical field of the screw installation, a device is paid to vacuum adsorption mechanism and screw lock is disclosed. This vacuum adsorption mechanism includes: the fixing component is arranged on the electric screw gun; the vacuum assembly penetrates through the fixing assembly and is detachably connected with the fixing assembly, and the vacuum assembly is communicated with the vacuum generator and is used for adsorbing the screw to be installed; criticize the head, criticize the head and wear to locate vacuum component and rather than can dismantle and be connected, criticize the one end of head and connect in the output of electronic screwdriver, the other end butt in the top of waiting to install the screw, electronic screwdriver can drive criticize the head and rotatory and follow its axial direction removal for vacuum component for the lock is paid and is waited to install the screw. This vacuum adsorption mechanism is earlier with whole vacuum assembly and criticize the head and dismantle from fixed subassembly as a whole, then will criticize the head and extract from vacuum assembly, accomplish the change of criticizing the head, need not to use other appurtenance to carry out the dismouting, reduce the degree of difficulty of changing, be convenient for install and maintain to the maintenance cost has been reduced.

Description

Vacuum adsorption mechanism and screw locking device

Technical Field

The utility model relates to a screw installation technical field especially relates to a device is paid to vacuum adsorption mechanism and screw lock.

Background

In the field of component assembly, screws are often required to be used as connecting pieces for fixing, and the screws are adsorbed and then accurately placed in mounting holes, which is an important factor for determining mounting quality.

The existing screw adsorption has two modes of magnetic adsorption and vacuum adsorption, the magnetic adsorption mode is adopted, the screw can be magnetized by magnetic force during working, the problems that the screw has residual magnetism after being screwed down and the magnetic force influences peripheral sensitive devices during screwing down exist, and the magnetic force is gradually weakened along with the time, so that the adsorption capacity of the screw is reduced. The vacuum adsorption mode is adopted, the original structure of the electric screw gun is required to be properly changed and then can be matched with the vacuum adsorption mechanism, the changed technical difficulty is high, the cost is high, and the replacement of the screwdriver bit is changed. . The parts need to be disassembled and assembled by using tools, so that the problems of inconvenience and difficult maintenance exist in the practical use.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a device is paid to vacuum adsorption mechanism and screw lock, the installation and the change of being convenient for, low in production cost.

To achieve the purpose, the utility model adopts the following technical proposal:

a vacuum adsorption mechanism comprising:

the fixing component is arranged on the electric screw gun;

the vacuum assembly penetrates through the fixing assembly and is detachably connected with the fixing assembly, and the vacuum assembly is communicated with the vacuum generator and used for adsorbing the screw to be installed;

criticize the head, criticize the head and wear to locate vacuum component and rather than can dismantle the connection, criticize the one end of head connect in the output of electronic screwdriver, the other end butt in the top of waiting to install the screw, electronic screwdriver can drive criticize the head for vacuum component is rotatory and remove along its axial direction, is used for the lock pay wait to install the screw.

Preferably, the fixing assembly includes:

a base connected to the electric screw gun;

the mounting base penetrates through the base station, the vacuum assembly penetrates through the mounting base, a communication hole is formed in the radial direction of the mounting base, and two ends of the communication hole are respectively communicated with the vacuum assembly and the vacuum generator.

Preferably, the vacuum assembly comprises:

the vacuum tube penetrates through the fixing component;

a guide bush provided inside the vacuum tube;

the sealing cover is arranged on the guide bushing and sealed on the vacuum tube, the batch head respectively penetrates through the vacuum tube, the guide bushing and the sealing cover, and a vacuum cavity is formed between the vacuum tube and the batch head.

Preferably, the vacuum adsorption mechanism further comprises a locking piece, a positioning ring groove is formed in the outer wall of the vacuum tube along the circumferential direction of the vacuum tube, and the locking piece can penetrate through the fixing component and abut against the inside of the positioning ring groove.

Preferably, the vacuum adsorption mechanism further comprises a sealing ring, wherein a sealing ring groove is formed in the outer wall of the vacuum tube along the circumferential direction of the outer wall of the vacuum tube, and the sealing ring is arranged in the sealing ring groove and abuts against the fixed component.

Preferably, the vacuum adsorption mechanism further comprises a limiting seat, the limiting seat is arranged on the fixing component, a boss is convexly arranged on the outer wall of the vacuum tube, and the boss can abut against the limiting seat.

Preferably, the guide bush is provided with a first guide hole along an axial direction thereof, and the bit is inserted into the first guide hole and is in sliding fit with the first guide hole.

Preferably, a transition hole and a vent hole are respectively arranged in the vacuum tube along the axial direction of the vacuum tube, the transition hole is positioned between the vacuum generator and the vent hole and is respectively communicated with the vacuum generator and the vent hole, and the batch head is respectively penetrated through the transition hole and the vent hole.

Preferably, an accommodating groove is formed in one end, far away from the sealing cover, of the vacuum tube, the accommodating groove is communicated with the vent hole, and the accommodating groove is used for partially accommodating the screw to be mounted.

The screw locking device is characterized by comprising an electric screw gun and the vacuum adsorption mechanism, wherein the electric screw gun is connected to the screwdriver head and used for driving the screwdriver head to rotate along the axis of the screwdriver head and move axially relative to the vacuum assembly.

The utility model has the advantages that:

the utility model provides a vacuum adsorption mechanism communicates in vacuum generator through vacuum assembly, utilizes vacuum adsorption's mode to realize waiting the absorption of installation screw, compares with prior art magnetic force adsorption mode, and the adsorption affinity can not weaken along with the lapse of time, adsorbs effectually lastingly, and vacuum adsorption can not arouse to wait to install that the screw exists remanence or peripheral sensitive device influence, excellent in use effect. Negative pressure is formed in the vacuum assembly through the vacuum generator and is used for adsorbing the screw to be installed, the verticality of the screw to be installed is guaranteed, the position of the screw to be installed cannot deviate even if the adsorbed screw to be installed is contacted with a workpiece, the relative position of the screw to be installed and the workpiece is guaranteed to be accurate during installation, and the assembly precision is improved; under the driving action of the electric screw gun, the screwdriver head rotates relative to the vacuum component and moves along the axial direction of the vacuum component, the screwdriver head drives the screw to be installed to move and rotate, the screw to be installed is quickly and accurately locked, and the assembling efficiency is improved.

When the batch head of wearing and tearing need to be changed, because set up vacuum assembly wear to locate fixed subassembly and rather than dismantling and be connected, dismantle from fixed subassembly whole vacuum assembly and batch head as a whole earlier, then will criticize the head and extract from vacuum assembly, and install new batch head in vacuum assembly, regard as a global mounting to fixed subassembly with vacuum assembly and new batch head jointly at last in, accomplish the quick replacement of batch head, need not to use other appurtenance to carry out the dismouting, reduce the degree of difficulty of changing, be convenient for installation and maintenance, thereby the maintenance cost has been reduced.

The utility model provides a device is paid to screw lock adopts above-mentioned vacuum adsorption mechanism, has guaranteed to criticize the head and has waited the relative position accuracy of installation screw to driving by electronic screwdriver head motion, accomplishing fast accurately and waiting to install screw locking, reduced intensity of labour, improved machining efficiency, do benefit to mass production. Meanwhile, the vacuum adsorption mechanism is independent and can be matched with an electric screw gun of any specification for use, the electric screw gun does not need to be changed, and the production cost is saved.

Drawings

Fig. 1 is a schematic structural view of the vacuum adsorption mechanism of the present invention;

fig. 2 is a cross-sectional view of the vacuum adsorption mechanism of the present invention;

FIG. 3 is a cross-sectional view of the vacuum tube in the vacuum suction mechanism of the present invention;

FIG. 4 is a cross-sectional view at A-A of FIG. 2;

fig. 5 is a cross-sectional view at B-B of fig. 2.

In the figure:

100. a screw to be installed;

1. a fixing assembly; 2. a vacuum assembly; 3. a batch head; 4. a seal ring; 5. a seal ring; 6. a locking member; 7. a limiting seat; 8. a gas joint;

11. a base station; 12. a mounting seat; 121. a communicating hole;

21. a vacuum tube; 22. a guide bush; 23. a sealing cover;

210. a stepped bore; 211. sealing the ring groove; 212. a positioning ring groove; 213. a boss; 214. a second guide hole; 215. a transition hole; 216. a vent hole; 217. accommodating grooves; 218. and (4) air inlet holes.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

The present embodiment provides a vacuum adsorption mechanism, as shown in fig. 1-2, the vacuum adsorption apparatus including: fixed subassembly 1, vacuum module 2 and criticize first 3, fixed subassembly 1 sets up on electronic screw rifle, and fixed subassembly 1 is preferred fixed connection on the elevating system of electronic screw rifle for fixed subassembly 1 can carry out elevating movement along with electronic screw rifle together. The fixing component 1 plays a role of integral support of the whole vacuum adsorption mechanism. The vacuum assembly 2 is connected to a vacuum generator for absorbing the screw 100 to be mounted. Vacuum component 2 wears to locate fixed subassembly 1 and can dismantle rather than being connected, and batch head 3 wears to locate vacuum component 2 and rather than can dismantle the connection, is convenient for install and maintain. One end of the screwdriver head 3 is connected to the output end of the electric screwdriver, the other end of the screwdriver head is abutted to the top of the screw 100 to be installed, and the electric screwdriver can drive the screwdriver head 3 to rotate relative to the vacuum component 2 and move along the axial direction of the vacuum component for locking the screw 100 to be installed, so that the screw 100 to be installed is screwed into the installation hole in the workpiece.

The vacuum adsorption mechanism that this embodiment provided communicates in vacuum generator through vacuum subassembly 2, utilizes vacuum adsorption's mode to realize waiting to install the absorption of screw 100, compares with prior art magnetic force adsorption mode, and the adsorption affinity can not weaken along with the lapse of time, adsorbs effectually lastingly, and vacuum adsorption can not arouse to wait to install screw 100 and have remanence or peripheral sensitive device influence, excellent in use effect. Negative pressure is formed in the vacuum component 2 through a vacuum generator and is used for adsorbing the screw 100 to be installed, the verticality of the screw 100 to be installed is guaranteed, the relative position of the screw 100 to be installed and a workpiece is accurate during assembly, and the assembly precision is improved; under the driving action of the electric screw gun, the screwdriver head 3 rotates relative to the vacuum component 2 and moves along the axial direction of the vacuum component, the screwdriver head 3 drives the screw 100 to be installed to move and rotate, the screw 100 to be installed is quickly and accurately locked, and the assembling efficiency is improved.

When the batch head 3 of wearing and tearing need to be changed, because set up vacuum assembly 2 and wear to locate fixed subassembly 1 and rather than dismantling and be connected, dismantle from fixed subassembly 1 as a whole with whole vacuum assembly 2 and batch head 3 earlier, then extract batch head 3 from vacuum assembly 2, and install new batch head 3 in vacuum assembly 2, regard as a unit mount to fixed subassembly 1 with vacuum assembly 2 and new batch head 3 jointly at last in, accomplish the change of batch head 3, need not to use other appurtenance to carry out the dismouting, reduce the degree of difficulty of changing, be convenient for installation and maintenance, thereby the maintenance cost has been reduced.

Further, as shown in fig. 2, the fixing assembly 1 includes a base 11 and a mounting base 12, the base 11 has a shape similar to a rectangular parallelepiped structure, and the base 11 is connected to a lifting mechanism of the electric screw gun and serves as a support for the intermediate connection. The mounting seat 12 is inserted into the base 11, the vacuum module 2 penetrates through the mounting seat 12, and the mounting seat 12 is used for mounting the vacuum module 2. A communication hole 121 is formed in the mounting base 12 along a radial direction thereof, and both ends of the communication hole 121 are respectively communicated with the vacuum module 2 and the vacuum generator, so that the vacuum generator can draw vacuum to the vacuum module 2 through the communication hole 121.

Further, as shown in fig. 2, the vacuum assembly 2 includes a vacuum tube 21, a guide bushing 22 and a sealing cover 23, a central hole is opened at a central position of the mounting seat 12, and the vacuum tube 21 is inserted through the central hole to install the vacuum tube 21 into the fixing assembly 1. The bulb 21 is a stepped shaft having a hollow structure, and a guide bush 22 is provided inside the bulb 21. Specifically, a stepped hole 210 (shown in fig. 3) is provided at one end of the vacuum tube 21 close to the electric screwdriver and inside the vacuum tube 21, and the stepped hole 210 is used for accommodating and limiting the guide bush 22. The sealing cover 23 is arranged on the guide bush 22 and is sealed and plugged on the vacuum pipe 21, the sealing cover 23 plays a role in sealing and plugging, the batch head 3 respectively penetrates through the vacuum pipe 21, the guide bush 22 and the sealing cover 23, the batch head 3 and an inner hole of the guide bush 22 are matched and centered in a sliding mode, and a vacuum cavity is formed between the vacuum pipe 21 and the batch head 3.

In order to further ensure the sealing effect of the vacuum chamber, as shown in fig. 2-3, the vacuum suction mechanism further includes a sealing ring 4, a sealing ring groove 211 is formed on the outer wall of the vacuum tube 21 along the circumferential direction thereof, and the sealing ring 4 is disposed in the sealing ring groove 211 and abuts against the mounting seat 12 of the fixing component 1. The sealing ring 4 is located between the sealing ring groove 211 and the central hole of the mounting seat 12, and sealing between the vacuum tube 21 and the mounting seat 12 is achieved. It can be understood that the number of the sealing ring grooves 211 and the sealing rings 4 is two, the two sealing ring grooves 211 are respectively arranged on two sides of the vent hole 216, and each sealing ring groove 211 is used for installing one sealing ring 4, so that the sealing effect is further ensured.

Preferably, a sealing ring 5 is arranged between the sealing cover 23 and the guide bushing 22, the sealing ring 5 is sleeved on the batch head 3, and the sealing ring 5 is used for sealing among the batch head 3, the guide bushing 22 and the sealing cover 23 through compression deformation of the sealing ring 5, so as to ensure the vacuum degree of the vacuum cavity.

In order to facilitate the installation and the disassembly of the vacuum tube 21 and the mounting seat 12, as shown in fig. 2 to 3, the vacuum adsorption mechanism further includes a locking member 6, a positioning ring groove 212 is formed on the outer wall of the vacuum tube 21 along the circumferential direction thereof, the locking member 6 is specifically a pulling pin, the locking member 6 can pass through the base platform 11 and the mounting seat 12 and abut against the inside of the positioning ring groove 212, so that the extending portion of the pulling pin is matched with and clamped with the positioning ring groove 212 and used for limiting the upper end and the lower end of the vacuum tube 21 along the axial direction. The locking element 6 can be brought into contact with the positioning ring groove 212 of the vacuum tube 21, thereby making it possible to detachably connect the vacuum tube 21 to the mounting socket 12. When disassembly is needed, the locking piece 6 is pulled outwards, and after the locking piece 6 is separated from the positioning ring groove 212, the vacuum tube 21 can be taken out of the mounting seat 12; when the vacuum tube 21 is required to be installed, after the vacuum tube 21 is placed in the installation seat 12, the locking piece 6 penetrates through the installation seat 12 and abuts against the positioning ring groove 212, and the installation of the vacuum tube 21 in the installation seat 12 is completed.

In order to ensure the accuracy of the installation position of the vacuum tube 21 in the installation seat 12 when the vacuum tube 21 is installed in the installation seat 12, as shown in fig. 2-3, the vacuum adsorption mechanism further includes a limiting seat 7, the limiting seat 7 is disposed on the installation seat 12 of the fixing assembly 1, and specifically, the limiting seat 7 is fixed on the lower surface of the installation seat 12 by a bolt. A boss 213 is provided on the outer wall of the vacuum tube 21, and the boss 213 can abut against the lower end surface of the stopper base 7. Through the mutual cooperation of boss 213 and spacing seat 7, realized vacuum tube 21's spacing, guaranteed vacuum tube 21's installation accuracy.

Further, as shown in fig. 2 to 3, the vacuum adsorption mechanism further includes an air connector 8 disposed in the limiting seat 7, specifically, one of the inner wall of the limiting seat 7 and the outer wall of the air connector 8 is provided with an external thread, and the other is provided with an internal thread, and the external thread and the internal thread are engaged with each other to screw the air connector 8 in the limiting seat 7. An air inlet hole 218 is formed in the vacuum tube 21 along the radial direction thereof, one end of the air connector 8 is communicated with the vacuum generator, and the other end is communicated with the air inlet hole 218 through the communication hole 121 of the mounting base 12, so that the vacuum generator draws air from the inner cavity of the vacuum tube 21 through the air connector 8, via the communication hole 121 and the air inlet hole 218, to form a vacuum chamber.

In order to facilitate the axial movement of the bit 3 in the vacuum tube 21, a first guide hole is axially formed in the guide bushing 22, and the bit 3 is inserted into the first guide hole and slidably engaged therewith. Through setting up first guiding hole and criticizing the upper end sliding fit of head 3, played the direction effect. Simultaneously, the upper end of wholesale head 3 can be supported by first guiding hole, has guaranteed the stability of structure.

In order to further facilitate the axial movement of the batch head 3 in the vacuum tube 21, as shown in fig. 2-3, a second guiding hole 214 is axially disposed at one end of the vacuum tube 21 away from the sealing cover 23, and the batch head 3 is inserted into and slidably engaged with the second guiding hole 214. Through setting up second guiding hole 214 and the lower extreme sliding fit of batch head 3, played the direction effect. Meanwhile, the lower end of the batch head 3 can be supported by the second guide hole 214, so that the structural stability is ensured. Under the common supporting action of the first guide hole and the second guide hole 214 on the batch head 3, the radial run-out of the batch head 3 is limited, and the accurate positioning of the batch head 3 is realized.

Further, as shown in fig. 4 and 5, a transition hole 215 and a vent hole 216 are respectively arranged in the vacuum tube 21 along the axial direction thereof, the transition hole 215 is located between the vacuum generator and the vent hole 216 and is respectively communicated with the vacuum generator and the vent hole 216, the vent hole 216 is arranged along the circumferential direction of the second guide hole 214 and is communicated with the second guide hole 214, and the batch head 3 is respectively penetrated through the transition hole 215 and the vent hole 216. Because the air joint 8 is connected with the vacuum generator, the air inlet hole 218, the transition hole 215, the second guide hole 214 and the vent hole 216 form a vacuum pipeline system, so that the screw 100 to be installed can be conveniently adsorbed. Through setting up transition hole 215, the clearance between transition hole 215 and the batch head 3 is bigger, and the pipeline resistance is little when the evacuation, is convenient for form the high vacuum fast.

Furthermore, an accommodating groove 217 is provided at an end of the vacuum tube 21 away from the sealing cover 23, the accommodating groove 217 may also be referred to as a contour hole, an inner contour of the accommodating groove 217 is adapted to a top portion of the screw 100 to be installed, and the accommodating groove 217 is used for partially accommodating the screw 100 to be installed. The receiving groove 217 is communicated with the vent hole 216 and is used for absorbing the screw 100 to be mounted.

The working process of the vacuum adsorption mechanism provided by the embodiment is as follows:

when replacing the worn batch head 3, the locking piece 6 is pulled out to the outside, after the locking piece 6 is separated from the positioning ring groove 212, the vacuum tube 21, the guide bush 22, the sealing cover 23, the batch head 3, the sealing ring 4 and the sealing ring 5 can be pulled out from the lower end of the mounting seat 12 as a whole, then the batch head 3 is pulled out from the upper end of the vacuum tube 21, a new batch head 3 is mounted from the upper end, finally, the whole vacuum sleeve system is inserted from the lower end of the mounting seat 12, the boss 213 of the vacuum tube 21 abuts against the lower end surface of the limiting seat 7, and the locking piece 6 penetrates through the mounting seat 12 and abuts against the positioning ring groove 212.

The embodiment provides a screw locking device, including electronic screw gun and vacuum adsorption mechanism, vacuum adsorption mechanism is used for adsorbing and treats installation screw 100, and electronic screw gun is drive element, and electronic screw gun is connected in criticizing first 3 for the axial displacement of first 3 edge self axis rotation and for vacuum component 2 is criticized in the drive to will treat the mounting hole of installation screw 100 screw in work piece.

The screw locking device that this embodiment provided adopts above-mentioned vacuum adsorption mechanism to drive by electronic screw rifle and criticize first 3 motions, it is accurate to treat the relative position of installation screw 100 and work piece when having guaranteed the assembly, improves the assembly precision, and quick accurate completion is treated installation screw 100 and is locked, has reduced intensity of labour, has improved assembly efficiency, does benefit to mass production. Meanwhile, the vacuum adsorption mechanism is independent and can be matched with an electric screw gun of any specification for use, the electric screw gun does not need to be changed, and the production time is saved.

In the description herein, it is to be understood that the terms "upper", "lower", "right", and the like are used in an orientation or positional relationship based on that shown in the drawings for convenience of description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.

In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied thereto. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. A vacuum adsorption mechanism, comprising:

a fixing assembly (1) arranged on the electric screw gun;

the vacuum component (2) penetrates through the fixing component (1) and is detachably connected with the fixing component, and the vacuum component (2) is communicated with a vacuum generator and is used for adsorbing a screw (100) to be installed;

criticize head (3), criticize head (3) wear to locate vacuum component (2) and rather than dismantling the connection, criticize the one end of head (3) connect in the output of electronic screw rifle, other end butt in wait to install the top of screw (100), electronic screw rifle can drive criticize head (3) for vacuum component (2) are rotatory and move along its axial direction, are used for the lock to pay wait to install screw (100).

2. Vacuum suction mechanism according to claim 1, characterized in that the fixing assembly (1) comprises:

a base (11) connected to the electric screw gun;

the mounting base (12) penetrates through the base (11), the vacuum assembly (2) penetrates through the mounting base (12), a communication hole (121) is formed in the mounting base (12) along the radial direction of the mounting base, and two ends of the communication hole (121) are respectively communicated with the vacuum assembly (2) and the vacuum generator.

3. Vacuum suction mechanism according to claim 1, characterized in that the vacuum assembly (2) comprises:

a vacuum tube (21) inserted in the fixed assembly (1);

a guide bush (22) provided inside the vacuum tube (21);

the sealing cover (23) is arranged on the guide bushing (22) and is sealed and plugged on the vacuum pipe (21), the batch head (3) is respectively arranged on the vacuum pipe (21), the guide bushing (22) and the sealing cover (23) in a penetrating mode, and a vacuum cavity is formed between the vacuum pipe (21) and the batch head (3).

4. Vacuum suction mechanism according to claim 3, further comprising a locking element (6), a positioning ring groove (212) being provided on the outer wall of the vacuum tube (21) along its circumference, the locking element (6) being able to pass through the fixing component (1) and abut into the positioning ring groove (212).

5. The vacuum suction mechanism according to claim 3, further comprising a sealing ring (4), wherein a sealing ring groove (211) is formed on the outer wall of the vacuum tube (21) along the circumferential direction of the vacuum tube, and the sealing ring (4) is disposed in the sealing ring groove (211) and abuts against the fixing component (1).

6. The vacuum suction mechanism according to claim 3, further comprising a limiting seat (7), wherein the limiting seat (7) is disposed on the fixing component (1), a boss (213) is convexly disposed on an outer wall of the vacuum tube (21), and the boss (213) can abut against the limiting seat (7).

7. The vacuum adsorption mechanism according to claim 3, wherein the guide bushing (22) is provided with a first guide hole along the axial direction thereof, and the batch head (3) is arranged through the first guide hole and is in sliding fit with the first guide hole.

8. The vacuum suction mechanism according to claim 3, wherein a transition hole (215) and a vent hole (216) are respectively arranged in the vacuum tube (21) along the axial direction thereof, the transition hole (215) is positioned between the vacuum generator and the vent hole (216) and is respectively communicated with the vacuum generator and the vent hole, and the batch head (3) is respectively penetrated through the transition hole (215) and the vent hole (216).

9. Vacuum suction mechanism according to claim 8, wherein a receiving groove (217) is provided at an end of the vacuum tube (21) remote from the sealing cover (23), the receiving groove (217) communicating with the vent hole (216), the receiving groove (217) being adapted to partially receive the screw (100) to be mounted.

10. A screw-tightening device, characterized in that it comprises an electric screw gun and a vacuum suction mechanism according to any one of claims 1 to 9, said electric screw gun being connected to said bits (3) for driving said bits (3) in rotation along their own axis and in axial movement with respect to said vacuum assembly (2).