CN212762064U

CN212762064U - Rotary assembly and rotary mechanism

Info

Publication number: CN212762064U
Application number: CN202022032266.8U
Authority: CN
Inventors: 祁宏
Original assignee: Dongguan Xinmeiyang Technology Co ltd
Current assignee: Dongguan Xinmeiyang Technology Co ltd
Priority date: 2020-09-16
Filing date: 2020-09-16
Publication date: 2021-03-23
Anticipated expiration: 2030-09-16

Abstract

The utility model relates to a close subassembly soon, include: a hollow cannula; a drive shaft fixed integrally with the sleeve, the drive shaft including a drive end disposed axially within the left side of the sleeve; the spiral rod is provided with a through hole in the middle in a penetrating manner and comprises a spiral rod body arranged in the axial right side of the sleeve and a screwing end extending out of the spiral rod body to the right side of the sleeve shaft; the ejector rod is inserted into the through hole of the screw rod and can move left and right; the first spring is abutted against the driving end in the sleeve and applies axial elastic force to the ejector rod. The application also comprises a rotary closing mechanism, and the rotary closing assembly and the rotary closing mechanism can realize automatic assembly operation of the microminiature structural member, and improve assembly efficiency and stability.

Description

Rotary assembly and rotary mechanism

Technical Field

The utility model relates to an automation equipment field especially relates to a close subassembly soon and close mechanism soon.

Background

Along with the fact that products around life are more and more precise, related structural parts are also more and more precise and small, a large bottleneck is generated in the assembly process of the products, in order to meet the quality and the capacity of the products, automatic production needs to be achieved for some micro precise structural parts, and the purposes of stabilizing the quality of the products and improving the production efficiency are achieved. Referring to fig. 1 and 2, a micro precision structural member is shown, which is a micro precision structural member that is matched and screwed with each other, and includes a first member 10 and a second member 20 screwed with the first member 10. The first component 10 is a screw rod of a precision die-casting aluminum piece; the second member 20 is a nut and is a precision stainless steel turned piece.

At present, the screwing of the first and

second components

10 and 20 is mainly manually operated under a magnifier by manpower, because the product is too small, the manual operation can block the sight range, the whole process can be completed only by consuming a long time, and the manual operation cannot be foolproof, so the production efficiency is low.

SUMMERY OF THE UTILITY MODEL

Based on this, the utility model provides a close subassembly soon and close mechanism soon that is used for the automatic assembly of microminiature structure spare.

In order to solve the above technical problem, the present application provides a screwing assembly, including:

a hollow cannula;

a drive shaft fixed integrally with the sleeve, the drive shaft including a drive end disposed axially within the left side of the sleeve;

the spiral rod is provided with a through hole in the middle in a penetrating manner and comprises a spiral rod body arranged in the axial right side of the sleeve and a screwing end extending out of the spiral rod body to the right side of the sleeve shaft;

the ejector rod is inserted into the through hole of the screw rod and can move left and right;

the first spring is abutted against the driving end in the sleeve and applies axial elastic force to the ejector rod.

Preferably, the right side of the sleeve is locked with the screw rod through a first locking nail, a moving groove is formed in the position, located at the first locking nail, of the sleeve along the axial direction, the screw rod and the sleeve can move relatively in the range of the moving groove, and the screw rod rotates along with the rotation of the sleeve; the left side of the sleeve is locked with the driving end of the driving shaft through a second locking nail so that the sleeve rotates along with the rotation of the driving shaft.

Preferably, a certain distance exists between the driving end and the screw rod, an engaging rod is further arranged between the first spring and the top rod, the engaging rod transmits the elastic force of the first spring to the top rod, and a first end of the engaging rod is located in a through hole of the screw rod.

Preferably, the driving end of the driving shaft is provided with a blind hole in the axial direction, the first spring is arranged in the blind hole, and the second end of the connecting rod is positioned in the blind hole and abuts against the first spring; a second spring is sleeved on the periphery of the connecting rod and clamped between the spiral rod and the driving end; a first end of the joint rod is in contact with the ejector rod in the through hole through a metal ball, and point contact is realized between the metal ball and the ejector rod as well as between the metal ball and the joint rod; the elastic force of the second spring is smaller than that of the first spring.

Preferably, the inner diameter of a through hole in the screw rod body is larger than the inner diameter of a through hole in the screwing end, the ejector rod comprises an ejector rod main body, a positioning end formed at the right end of the ejector rod main body and capable of extending out of the screwing end rightwards and a pushing end limited in the through hole in the screw rod body, the outer diameter of the pushing end is larger than the inner diameter of the through hole in the screwing end, the outer diameter of the positioning end is gradually reduced at a free end, and the screw rod is in contact with the metal ball through the pushing end.

Preferably, lubricating oil is smeared on the periphery of the metal ball in the through hole.

Preferably, the screwing assembly is used for automatically screwing a first member and a second member, the first member comprises a main body part, a bolt formed by extending from the main body part, a through hole axially penetrating through the inner part of the bolt and an external thread arranged on the periphery of the bolt; the second component comprises a cylinder, internal threads arranged on the inner wall surface of the cylinder and a plurality of clamping grooves arranged on the end surface of the cylinder; the outer diameter of the screwing end of the spiral rod is smaller than that of the spiral rod body, a plurality of clamping blocks are arranged on the right end face of the screwing end, and the clamping groove of the second component and the clamping blocks are assembled on the screwing end in a buckled mode.

Preferably, the first member and the second member are coaxially fixed on the right side of the screw rod, and the top rod is inserted into the through hole of the first member after being ejected out of the through hole by elastic force, so that the first member and the second member are coaxially arranged.

In order to solve the technical problem, the application further provides a close mechanism soon, including the base, install in slide rail set spare on the base closes the subassembly with worm case, fixed subassembly and the aforesaid soon, close the subassembly soon connect in the worm subassembly right side, fixed subassembly is located close the subassembly right side soon, first component is fixed in on the fixed subassembly.

Preferably, the base comprises a first mounting part and a second mounting part which are arranged in the left-right direction, a fixing groove which is formed in the upper surface of the second mounting part in the longitudinal direction, and a first limiting column and a second limiting column which are fixed on the left side and the right side of the first mounting part, the second limiting column is close to one side of the fixing groove, and a guide inclined plane is arranged on one side, far away from the fixing groove, of the second limiting column; the sliding rail assembly comprises a sliding rail seat fixed on the surface of the first installation part along the left-right direction, a sliding block capable of moving left and right on the sliding rail seat, an installation plate fixed on the sliding block, and a limiting assembly assembled on the installation plate and capable of being matched with the second limiting column; the worm assembly and the screwing assembly are fixed above the mounting plate.

The automatic assembly of miniature structure spare has been realized to this application, realizes the ingenious transmission of packing force and moment of torsion simultaneously, reaches miniature structure spare's accurate assembly demand, and full automatic assembly guarantees product quality, improves production efficiency.

According to the screwing assembly and the rotating mechanism, the ejector rod arranged in the sleeve of the screwing assembly moves rightwards and is inserted into the through hole of the first component, so that the first component and the second component are positioned on the same axis, and then the screw rod rotates to drive the second component to be screwed on the first component.

Drawings

FIG. 1 is a perspective view and a cross-sectional view of a first member of the present application;

FIG. 2 is a perspective view of a second member of the present application;

FIG. 3 is a perspective view of the closure mechanism of the present application;

FIG. 4 is an exploded perspective view of the twist mechanism of the present application;

FIG. 5 is a perspective assembly view of the worm assembly and the screwing assembly of the screwing mechanism of the present application;

FIG. 6 is a perspective view of a twist assembly of the twist mechanism of the present application;

FIG. 7 is a cross-sectional view of a spin pack assembly of the spin mechanism of the present application;

FIG. 8 is a perspective view of a screw shaft of the screwing assembly of the screwing mechanism of the present application;

fig. 9 is a perspective view of a fixing block of the screwing mechanism of the present application.

The attached drawings are as follows:

a first member-10; a main body portion-11; an outer wall-12; bolt-13; a through-hole-14; an annular groove-15; external thread-16; positioning surface-17; a second member-20; a cylinder body-21; internal threads-22; a card slot-23; a base-30; a first mounting portion-31; a second mounting portion-32; a fixed groove-33; a first restraint post-34; a second limit post-35; a guide ramp-351; -40, a slide rail assembly; a slide rail seat-41; a slide rail slot-411; a slide-42; a slider slot-421; a mounting plate-43; a spacing assembly-44; a limiting seat-441; a through slot 442; driving lever-443; -444 of a rotating shaft; a locking part-445; pry-446; an elastic member-447; a worm assembly-50; a worm box-51; a worm casing-511; worm case cover-512; a power input shaft-52; input terminal-521; rotating the fixed end-522, 531, 532, 541; an input shaft turbine-523; a drive shaft-53; a first drive turbine-533; a second drive turbine-534; a drive shaft-54; a drive turbine-542; a drive end-543; a blind hole-544; -60, a screwing assembly; an engagement rod-61; metal ball-62; a mandril-63; a ram body-631; positioning end-632; a top pushing part-633; a sleeve-64; a moving groove-641; screw rod-65; a screw rod body-651; perforation-652; a hinged end-653; end-654; a clamping block-655; a first spring-66; a second spring-67; a first lock pin-68; a second locking pin-69; -a securing assembly-70; a fixed seat-71; a fixed groove-72; a fixed block-73; immobilization substrate-731; a sleeve shaft-732; a limiting part-733; a stop surface-734.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

In the present application, the direction is defined as shown in fig. 3, the X direction is the right direction of the lateral direction or the left-right direction, the Y direction is the rear direction of the longitudinal direction or the front-rear direction, and the Z direction is the vertical direction or the up-down direction.

Referring to fig. 1 and 2, the screwing mechanism of the present application is used to realize the automatic screwing of the first and

second components

10 and 20 to improve efficiency and yield. The first member 10 includes a body 11, an outer wall 12 and a bolt 13 extending from one side of the body 11, a through hole 14 penetrating the bolt 13 in the left and right directions, an annular groove 15 formed between the bolt 13 and the outer wall 12, and a male screw 16 provided on the outer periphery of the bolt 13. The through hole 14 penetrates through the bolt 13 to form a structure with two open ends, a positioning surface 17 is formed by cutting off part of the outer wall 12, part of the positioning surface 17 is communicated with the annular groove 15, and the positioning surface 17 is a horizontal plane. The first member 10 is a bolt or a screw.

The second member 20 is a nut, and the second member 20 includes a cylinder 21, an internal thread 22 provided on an inner wall surface of the cylinder 21, and a plurality of engaging grooves 23 provided on an end surface of the cylinder 21.

Referring to fig. 3 and 4, the screwing mechanism of the present application includes a base 30, a sliding rail assembly 40 and a worm assembly 50 mounted on the base 30, a screwing assembly 60 connected to the right side of the worm assembly 50, and a fixing assembly 70 fixed on the base 30 and opposite to the screwing assembly 60.

The base 30 includes a first mounting portion 31 and a second mounting portion 32 arranged in the left-right direction, a fixing groove 33 formed in the upper surface of the second mounting portion 32 in the longitudinal direction, and first and second limiting

posts

34, 35 fixed to the left and right sides of the first mounting portion 31. The second position-limiting pillar 35 is close to one side of the fixing groove 33, and a guiding inclined surface 351 is disposed on one side of the second position-limiting pillar 35 away from the fixing groove 33.

The slide rail assembly 40 includes a slide rail seat 41 fixed on the surface of the first installation portion 31 along the left-right direction, a slide block 42 movable left and right on the slide rail seat 41, an installation plate 43 fixed on the slide block 42, and a limit assembly 44 assembled on the installation plate 43 and capable of being matched with the second limit post 35.

The slide rail seat 41 is long and is provided with slide rail grooves 411 at the outer edges of the two longitudinal sides, the bottom of the slide block 42 is recessed upwards, and slide block grooves 421 matched with the slide rail grooves 411 are arranged at the two longitudinal sides of the recessed part, so that the slide block 42 can slide left and right on the slide rail seat 41 through the matching of the slide block grooves 421 and the slide rail grooves 411. The slide rail seat 41 is fixedly locked on the base 30 through a plurality of screws, the left side of the slide rail seat 41 abuts against the first limiting column 34, and the mounting plate 43 is fixedly locked on the sliding block 42 through screws. The position-limiting assembly 44 includes a position-limiting seat 441, a through slot 442 passing through the bottom of the position-limiting seat 441, a driving lever 443 rotatably mounted in the through slot 442, and an elastic member 447 for providing an elastic supporting force to one end of the driving lever 443. The limiting seat 441 is fixed to the mounting plate 43 near the second limiting column 35 by screws, and the through groove 442 is opposite to the second limiting column 35 in the left-right direction. The shifting lever 443 is rotatably installed in the through groove 442 of the stopper seat 441 through a rotating shaft 444, the shifting lever 443 includes a locking portion 445 located on one side of the second stopper post 35 and a levering portion 446 located on the left side, the lower surface of the levering portion 446 becomes thinner gradually towards the free end direction so that a pressing space is formed between the lower surface of the levering portion 446 and the upper surface of the mounting plate 43, and the elastic member 447 is supported between the levering portion 446 and the mounting plate 43. The bottom of the locking portion 445 can cooperate with the guiding inclined surface 351 of the second position-limiting pillar 35 to lock the locking portion on the side of the second position-limiting pillar 35 close to the fixing groove 33 beyond the top of the second position-limiting pillar 35, so as to lock the position of the sliding block 42 and the mounting plate 43 via the position-limiting component 44.

The worm assembly 50 includes a worm case 51 fixed to the left side of the mounting portion 43, a power input shaft 52 mounted in the worm case 51 and partially extending out of the worm case 51, a transmission shaft 53 having two ends limited in the worm case 51 and engaged with the power input shaft 52, and a driving shaft 54 engaged with the transmission shaft 53. The worm case 51 includes a worm case 511 and a worm case cover 512. The input shaft 52 includes an input end 521 extending out of the left side of the worm case 51, a rotation fixing end 522 rotatably fixed to the right side of the worm case 51, and an input shaft turbine 523 disposed on the input shaft 52 and located in the worm case 511.

The transmission shaft 53 is vertically matched with the input shaft 52, and the transmission shaft 53 includes two rotating fixing

parts

531, 532 rotationally fixed at two longitudinal sides of the worm box 511, a first transmission turbine 533 matched with the input shaft turbine 523, and a second transmission turbine 534 arranged at the other longitudinal side of the transmission shaft 53. The driving shaft 54 is disposed in parallel with the input shaft 53, and the driving shaft 54 includes a rotation fixing end 541 rotatably fixed to the lateral outer side of the worm housing 51 and a driving worm gear 542 disposed on the driving shaft 54 and engaged with the second driving worm gear 534.

As shown in fig. 6 to 8, the screwing assembly 60 includes a driving end 543 extending from one end of the driving shaft 54, a screw rod 65, a top rod 63 inserted into the screw rod 65 and capable of moving in a transverse direction, a metal ball 62 disposed in the screw rod 65 and abutting against the top rod 63, a connecting rod 61 connecting the driving end 543 and the metal ball 62, a second spring 67 sleeved outside the connecting rod 61 and clamped between the screw rod 65 and the driving end 543, a first spring 66 disposed in the connecting rod 61 and elastically supporting the connecting rod 61 and the driving end 543, and a sleeve 64 wrapped outside the screw rod 61 and the driving end 543 and fixed to the driving end 543 and the screw rod 61, respectively.

The driving end 543 is formed with a blind hole 544, and the first spring 66 is disposed in the blind hole 544. The driving end 543 has an outer diameter larger than that of the driving shaft 54, and the blind hole 544 extends in the left-right direction and is open at a free end. The screw rod 65 comprises a screw rod body 651, a screwing end 653 formed at the right end of the screw rod body 651, a through hole 652 penetrating the screw rod body 651 from left to right, and a clamping block 655 arranged on the end face 654 of the screwing end 653. The outer diameter of the screw body 651 is larger than the outer diameter of the screwing end 653, and the inner diameter of the through hole 652 in the screw body 651 is larger than the inner diameter of the through hole 652 in the screwing end 653.

The push rod 63 includes a push rod main body 631, a positioning end 632 formed at the right end of the push rod main body 631 and extending out of the screwing end 653, and a pushing end 633 limited in the through hole 652 of the spiral rod body 651. The outer diameter of the pushing tip 633 is not larger than the inner diameter of the through hole 652 in the spiral rod body 651, and the outer diameter of the pushing tip 633 is larger than the inner diameter of the through hole 652 of the screwing end 653. The outer diameter of the positioning end 632 is no greater than the inner diameter of the bore 652 of the twist end 653 and the outer diameter of the positioning end 632 tapers at the free end. The metal ball 62 is disposed in the through hole 652 of the spiral rod body 651 and abuts against the pushing tip 633.

The two ends of the connecting rod 61 are respectively sleeved in the through hole 652 of the spiral rod body 651 and the blind hole 544 of the driving end 543. The second spring 67 is sleeved outside the connecting rod 61, one end of the connecting rod 61 abuts against the metal ball 62 in the through hole 652, and the other end is located in the blind hole 544 and abuts against the first spring 66. Two ends of the second spring 67 respectively abut against the end edges of the spiral rod 651 and the driving end 543.

The sleeve 64 is sleeved outside the spiral rod body 651, the driving end 543 and the second spring 67, the sleeve 64 and the spiral rod body 651 are fixed together through a first lock pin 68, and the sleeve 64 and the driving end 543 are fixed together through a second lock pin 69. The sleeve 64 is provided with a moving groove 641 at the position of the first locking pin 68, the moving groove 641 is provided in the axial direction, the first locking pin 68 can move along the moving groove 641 in the axial direction, that is, the screw rod 65 and the sleeve 64 can move in the axial direction, and when rotating, the screw rod 65 can rotate with the rotation of the sleeve 64.

The outer diameter of the screwing end 653 of the screw rod 65 is the same as the outer diameter of the nut 20, and the locking groove 23 of the nut 20 is locked on the locking block 655 on the end face 654 of the screwing end 653. The clamping blocks 655 correspond to the clamping grooves 23 in number, and are preferably evenly distributed in four at 360 degrees.

Referring to fig. 4 and 9, the fixing assembly 70 is mounted and fixed in the fixing groove 33 of the base 30, and the fixing assembly 70 includes a fixing seat 71 locked in the fixing groove 33, a fixing block 73 fixed on the left side of the fixing seat 71, and a sleeve 732 protruding from the left side of the fixing block 73.

A fixing groove 72 is formed in the left side of the fixing seat 71 in the vertical direction, and the fixing block 73 is fixed in the fixing groove 72. The fixing block 73 includes a fixing base 731, a position-limiting portion 733 formed to protrude from a left side portion of the fixing base 731, and a position-limiting surface 734 formed on the position-limiting portion 733. The middle portion of the stopper 733 is formed with a notch 735, the sleeve 732 is formed to protrude leftward from the left middle portion of the fixed block 73, the outer diameter of the sleeve 732 is equal to the inner diameter of the through hole 14 of the bolt 13, so that the bolt 13 is sleeved on the sleeve 732, the positioning surface 17 of the first member 10 is positioned in cooperation with the stopper surface 734 of the fixed block 73, and the notch 735 is formed to avoid the external thread 16 of the bolt 13 in the middle of the positioning surface 17.

The outer diameter of the free end of the positioning end 632 of the ejector rod 63 is smaller than the inner diameter of the through hole 14 of the bolt 13. The sleeve shaft 732 and the push rod 63 are on the same axis.

When the concrete screwing operation is carried out, the screwing mechanism carries out the operation according to the following steps:

first, the first and

second members

10 and 20 are fixed to the sleeve shaft 732 of the fixed block 73 and the end surface 654 of the screw rod 65, respectively, by a robot or a worker;

the sleeve shaft 732 is inserted into the through hole 14 of the first member 10, and the positioning surface 17 is positioned in contact with the limiting surface 734 of the fixing block 73 and can prevent the first member 10 from rotating around the sleeve shaft 732; the notch 735 is configured to clear the external threads 16 of the bolt 13 intermediate the locating surfaces 17.

Subsequently, the slide rail assembly 40 is moved to move the mounting plate 43 and the worm assembly 50 thereon and the screwing assembly 60 rightward until the locking portion 445 of the limiting assembly 44 is locked by being caught on the second limiting post 35. During the moving process, the bottom surface of the locking portion 445 is an inclined surface and cooperates with the guiding inclined surface 351 of the second position-limiting pillar 35 to slide over the guiding inclined surface 351 to lock the lock, and the elastic member 447 is compressed to provide an elastic force. The step can be manual movement, or the movement of the slide block 42 can be driven by a power source to realize automation.

In the process, the screwing mechanism 60 moves rightwards, the screw rod 65 moves rightwards to enable the second member 20 to be in fit with the first member 10, meanwhile, the driving end 543 continues to move rightwards, at the moment, the driving end 543 and the connecting rod 61 compress the first spring 66, the first spring 66 applies force F1 to the connecting rod 61, the connecting rod 61 applies force to the metal ball 62 and pushes the top rod 63 to move rightwards through the metal ball 62 until the free end of the top rod 63 moves out of the right end of the through hole 652 and passes through the second member 20 to enter the through hole 14 of the bolt 13 of the first member 10, so that the first member 10 and the second member 20 are on the same axis.

Finally, the power source is started, and the power source outputs power to rotate the power input shaft 52, so as to drive the worm assembly 50 to rotate, force the driving end 543 to rotate and move rightwards, so that the second member 20 is screwed on the bolt 13 of the first member 10;

in this step, the sleeve 64, the driving end 543 and the screw rod 65 are fixed together, and when the driving end 543 rotates, the screw rod 65 rotates simultaneously to drive the second member 20 to rotate and screw on the bolt 13. The driving end 543 still drives the screw rod 65 to move rightward continuously, so that the screwing end 653 of the screw rod 65 drives the second member 20 to rotate into the annular groove 15 between the outer wall 12 of the first member 10 and the bolt 13, thereby completing the locking. In the process, the top rod 63 is in point contact with the connecting rod 61 through the metal ball 62, when the driving end 543 rotates, the top rod 63 only generates axial force without rotating, and meanwhile, friction between the connecting rod 61, the metal ball 62 and the top rod and the blind hole 544 of the driving end 543 and the through hole 652 of the screw rod 65 is reduced through the action of lubricating oil. In the process, the driving end 543 and the screw rod 63 compress the second spring 67, the second spring 67 exerts a second axial force F2, F2 is smaller than F1, and the F2 acts on the screw rod 65 to eliminate the thread gap between the first member 10 and the second member 20.

The first member 10 and the second member 20 are not limited to a screw and a nut, and may be any components that need to be fastened by means of threads. Meanwhile, the first member 10 may be a nut, and the second member 20 may be a screw.

Before the screwing component 60 of the screwing mechanism of the present application is rotated, the push rod 65 arranged in the sleeve 64 of the screwing component 60 moves rightwards and is inserted into the through hole 14 of the first member 10, so that the first member 10 and the second member 20 are positioned on the same axis, and then the rotation of the screw rod 65 drives the second member 20 to be screwed on the first member 10.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only represent preferred embodiments of the present invention, which are described in more detail and detail, but are not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A spin-on assembly, comprising:

a hollow cannula;

2. The screwing assembly of claim 1, wherein the right side of the sleeve is locked with the screw rod by a first locking nail, the sleeve is provided with a moving groove along the axial direction at the first locking nail position, the screw rod and the sleeve can move relatively within the range of the moving groove, and the screw rod simultaneously rotates along with the rotation of the sleeve; the left side of the sleeve is locked with the driving end of the driving shaft through a second locking nail so that the sleeve rotates along with the rotation of the driving shaft.

3. The screwing assembly of claim 2 wherein said driving end is spaced from said screw shaft, an engaging rod is disposed between said first spring and said top rod, said engaging rod transmitting the elastic force of said first spring to said top rod, a first end of said engaging rod being disposed within said bore of said screw shaft.

4. The screwing assembly of claim 3 wherein the driving end of the driving shaft is provided with a blind hole in the axial direction, the first spring is disposed in the blind hole, and the second end of the connecting rod is disposed in the blind hole and abuts against the first spring; a second spring is sleeved on the periphery of the connecting rod and clamped between the spiral rod and the driving end; a first end of the joint rod is in contact with the ejector rod in the through hole through a metal ball, and point contact is realized between the metal ball and the ejector rod as well as between the metal ball and the joint rod; the elastic force of the second spring is smaller than that of the first spring.

5. The screwing assembly of claim 4, wherein the inner diameter of the through hole in the screw rod body is larger than the inner diameter of the through hole in the screwing end, the push rod comprises a push rod main body, a positioning end formed at the right end of the push rod main body and capable of extending out of the screwing end rightwards and a pushing end limited in the through hole in the screw rod body, the outer diameter of the pushing end is larger than the inner diameter of the through hole in the screwing end, the outer diameter of the positioning end is gradually reduced at the free end, and the screw rod is in contact with the metal ball through the pushing end.

6. The spin-on assembly of claim 5 wherein the metal balls in the through holes are coated on their outer circumference with a lubricant.

7. The screwing assembly of claim 5, wherein the screwing assembly is used for automatically screwing a first member and a second member, and the first member comprises a main body part, a bolt formed by extending from the main body part, a through hole axially formed through the inner part of the bolt, and an external thread arranged on the periphery of the bolt; the second component comprises a cylinder, internal threads arranged on the inner wall surface of the cylinder and a plurality of clamping grooves arranged on the end surface of the cylinder; the outer diameter of the screwing end of the spiral rod is smaller than that of the spiral rod body, a plurality of clamping blocks are arranged on the right end face of the screwing end, and the clamping groove of the second component and the clamping blocks are assembled on the screwing end in a buckled mode.

8. The screwing assembly of claim 7, wherein said first member and said second member are coaxially fixed to the right side of said screw rod, and said top rod is inserted into the through hole of said first member after being ejected out of said through hole by elastic force so that said first member and said second member are coaxially arranged.

9. A screwing mechanism is characterized by comprising a base, a sliding rail assembly and a worm assembly which are arranged on the base, a fixing assembly and the screwing assembly as claimed in claim 8, wherein the screwing assembly is connected to the right side of the worm assembly, the fixing assembly is positioned on the right side of the screwing assembly, and the first component is fixed on the fixing assembly.

10. The screwing mechanism as claimed in claim 9, wherein the base includes a first mounting portion and a second mounting portion arranged in a left-right direction, a fixing groove opened on an upper surface of the second mounting portion in a longitudinal direction, and first and second position-limiting posts fixed to left and right sides of the first mounting portion, the second position-limiting post being adjacent to one side of the fixing groove, the second position-limiting post being provided with a guide slope on a side away from the fixing groove; the sliding rail assembly comprises a sliding rail seat fixed on the surface of the first installation part along the left-right direction, a sliding block capable of moving left and right on the sliding rail seat, an installation plate fixed on the sliding block, and a limiting assembly assembled on the installation plate and capable of being matched with the second limiting column; the worm assembly and the screwing assembly are fixed above the mounting plate.