Automatic assembling device and method for annular workpiece

Abstract

The invention relates to the technical field of automobile pressure sensor assembling, in particular to an automatic annular workpiece assembling device and method.The automatic annular workpiece assembling device comprises a stand column, a workbench longitudinally installed at the top end of the stand column and a feeding channel transversely installed in the middle of the table top of the workbench and further comprises a material staggering mechanism, a material distributing mechanism, a circulation jig and a material taking and press fitting mechanism; the material staggering mechanism is longitudinally installed on the rear portion of the table top of the workbench so as to push out materials in the material supply channel. The material distributing mechanism is vertically installed at the front end of the workbench so as to store materials pushed out of the material supply channel. The circulation jig is arranged on the right side of the workbench and conveyed by the line body. The material taking and press fitting mechanism is installed at the top end of the workbench so as to take away the materials stored on the material distributing mechanism and assemble the materials into the products on the circulation jig. According to the automatic assembling device and method for the annular workpieces, the structural design is simple, the assembling efficiency is high, the assembling quality is stable, and the automatic assembling device and method can be compatible with various products.

Description

Technical Field

[0001] The invention relates to the technical field of automobile pressure sensor assembly, and in particular to an annular workpiece automatic assembly device and an assembly method. Background Art

[0002] In the process of assembling automotive pressure sensors, O-rings are mainly used for end face sealing, that is, the O-rings are assembled to the inner hole of the product. The traditional assembly methods of O-rings mainly use O-ring clamps and expansion shafts. The two methods have similar principles. The inner diameter of the O-ring is enlarged by clamps or expansion shafts, and then the O-ring is pulled down and fitted on the product by a pusher mechanism. The above two methods are suitable for radial sealing, but are obviously not suitable for end face sealing.

[0003] At present, the O-rings are usually assembled manually in automotive pressure sensors, which is time-consuming and labor-intensive, and the stability of assembly quality is difficult to guarantee. There are also special assembly equipment on the market that can realize the automatic assembly of O-rings, but its structural design is complex, the assembly efficiency is low, and it is not compatible with multiple products. For example, some products have steps in the inner hole (such as Figure 1 As shown), some products have no steps in the inner hole (such as Figure 2 As shown in Figure 2, the assembly equipment needs to be designed separately. In addition, due to the flexibility of the O-ring itself, its roundness consistency is very poor, and the automated assembly process is difficult to achieve. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide an annular workpiece automatic assembly device and assembly method with simple structural design, high assembly efficiency, stable assembly quality, and compatibility with multiple products.

[0005] The technical solution adopted by the present invention to solve the technical problem is: an annular workpiece automatic assembly device, including a column, a workbench longitudinally installed on the top of the column and a feeding channel transversely installed in the middle of the workbench table, and also includes:

[0006] The material error mechanism is installed longitudinally at the rear of the workbench to push out the material in the feeding channel;

[0007] The material distribution mechanism is vertically installed at the front end of the workbench to store the materials pushed out of the feeding channel;

[0008] The flow fixture is set on the right side of the workbench and transported by the line;

[0009] And a material taking and pressing mechanism is installed on the top of the workbench to take away the materials stored on the material dividing mechanism and assemble them into the products on the flow fixture.

[0010] Furthermore, the material picking and pressing mechanism includes a bracket, a two-dimensional motion component and a material picking and pressing component, the bracket is horizontally installed at the top rear of the workbench, the two-dimensional motion component is installed on the bracket, and the material picking and pressing component is vertically installed at the driving end of the two-dimensional motion component.

[0011] Furthermore, the material picking press-fitting assembly includes a sleeve, a material picking shaft, a retaining ring, a return spring, a press-fitting sleeve, a chamfered table and a limit piece. The sleeve is a hollow structure, the material picking shaft is coaxially arranged in the sleeve and is clearance-matched with the sleeve, the top end of the material picking shaft passes through a first through hole opened in the top end of the sleeve, and its bottom end passes through a second through hole opened in the bottom end of the sleeve, the retaining ring and the return spring are both arranged in the sleeve and sleeved on the material picking shaft, the outer ring of the retaining ring is supported on an annular ridge formed on the inner wall of the sleeve, and the inner ring of the retaining ring is supported on a shoulder formed in the middle part of the material picking shaft, the top end of the return spring is in contact with the top wall of the sleeve, and the bottom end is in contact with the top end of the retaining ring, the press-fitting sleeve is installed at the bottom end of the sleeve and sleeved on the material picking shaft, the chamfered table is installed at the bottom end of the material picking shaft, and there are several limit pieces installed on the bottom circumferential wall of the material picking shaft.

[0012] Furthermore, the outer side surface of the limiting member includes a curved surface, a straight surface and a sloped surface which are sequentially connected from top to bottom, and the sloped surface is seamlessly connected with the peripheral wall of the inverted frustum.

[0013] Furthermore, the two-dimensional motion component includes a transverse module and a vertical module, the transverse module is installed on the top of the bracket, the vertical module is installed on the slide of the transverse module, and the material picking and pressing assembly is installed on the slide of the vertical module.

[0014] The cam is connected to the bottom of the workbench by a plurality of lifting and lowering means, and the lifting and lowering means are connected to the bottom of the workbench by a plurality of lifting and lowering means.

[0015] Furthermore, the material error mechanism includes a material error cylinder and a push block, the material error cylinder is longitudinally installed on the table top of the workbench, and its driving end is connected to the rear end of the push block, and the push block is longitudinally arranged on the workbench.

[0016] Furthermore, the flow fixture includes a base plate, a boss, a placement seat and a stop pin, the base plate is installed on the wire body, the boss is installed in the middle of the top end of the base plate, the bottom end of the placement seat is inserted into a fourth through hole opened in the middle of the boss, and is detachably connected to the boss through the stop pin.

[0017] Furthermore, the feed channel includes a guide plate, a reference block and a second counter-shooting sensor. The guide plate is horizontally arranged on the table surface of the workbench. The guide plates are two in number and are arranged side by side at intervals. Grooves are symmetrically provided at the bottom ends of opposite sides of the guide plates. The reference blocks are arranged at intervals on the right side of the guide plates. The second counter-shooting sensor is arranged at the top of the reference block and the bottom of the workbench. An avoidance through hole is provided in the middle of the workbench.

[0018] A method for automatically assembling an annular workpiece, the steps are as follows:

[0019] S1. Loading: Materials are transported to the feeding channel in an orderly manner;

[0020] S2. Material distribution: The material dislocation mechanism pushes the material in the feed channel to the material distribution mechanism for storage;

[0021] S3. Material taking and pressing: The material taking and pressing mechanism takes the material stored on the material distribution mechanism and assembles it into the product on the flow fixture.

[0022] The beneficial effects of the present invention are:

[0023] (1) The present invention pushes the material in the feed channel into the material distribution mechanism for storage through the material error mechanism, and then takes out the material stored on the material distribution mechanism through the material taking and pressing mechanism, and assembles it into the product on the flow fixture, thereby realizing the assembly of the material in the inner hole of the product. The whole process is automated, the assembly efficiency is significantly improved, and the stability of the assembly quality is guaranteed.

[0024] (2) The present invention can realize accurate assembly of materials by setting the material picking and pressing assembly, regardless of whether the inner hole of the product has a step, and has strong compatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 It is a schematic diagram of a product with a step in the inner hole;

[0027] Figure 2 This is a schematic diagram of a product with no steps in the inner hole;

[0028] Figure 3 It is a schematic diagram of the structure of the present invention;

[0029] Figure 4 It is a schematic diagram of the feed channel in the present invention;

[0030] Figure 5 It is a schematic diagram of the material taking and pressing mechanism in the present invention;

[0031] Figure 6 is a cross-sectional view of the material taking and pressing assembly of the present invention;

[0032] Figure 7 It is a schematic diagram of the material taking shaft in the present invention;

[0033] Figure 8 It is a schematic diagram of the material distribution mechanism in the present invention;

[0034] Fig. 9 It is a cross-sectional view of the material dispensing mechanism in the present invention;

[0035] Fig.10 It is a schematic diagram of the circulation fixture in the present invention;

[0036] Fig.11 It is a cross-sectional view of the circulation fixture in the present invention.

[0037] In the figure: 100, column; 200, workbench; 210, third through hole; 220, avoidance through hole; 300, feeding channel; 310, guide plate; 311, groove; 320, reference block; 330, second counter-shooting sensor; 400, material error mechanism; 410, material error cylinder; 420, push block; 500, material distribution mechanism; 510, frame; 520, material distribution motor; 530, rotating shaft; 540, material distribution plate; 541, step cavity; 542, notch; 543, avoidance channel; 550, lifting column; 560, tightening spring; 570, first counter-shooting sensor; 600, flow fixture; 61 0, bottom plate; 620, boss; 621, fourth through hole; 630, placement seat; 640, stop pin; 700, material picking and pressing mechanism; 710, bracket; 720, two-dimensional motion component; 721, horizontal module; 722, vertical module; 730, material picking and pressing assembly; 731, sleeve; 7311, first through hole; 7312, second through hole; 732, material picking shaft; 7321, shaft shoulder; 733, retaining ring; 734, return spring; 735, press-fitting sleeve; 736, inverted frustum; 737, limit piece; 7371, arc surface; 7372, straight surface; 7373, inclined surface; 738, annular edge. DETAILED DESCRIPTION

[0038] The present invention will now be further described in conjunction with the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0039] Example 1

[0040] like Figure 3 As shown, an automatic assembly device for annular workpieces includes a column 100, a workbench 200 longitudinally installed on the top of the column 100, and a feeding channel 300 transversely installed in the middle of the table top of the workbench 200, and also includes a material error mechanism 400, a material dividing mechanism 500, a flow fixture 600 and a material picking and pressing mechanism 700. The material error mechanism 400 is longitudinally installed at the rear of the table top of the workbench 200 to push out the material in the feeding channel 300; the material dividing mechanism 500 is vertically installed at the front end of the workbench 200 to store the material pushed out of the feeding channel 300; the flow fixture 600 is arranged on the right side of the workbench 200 and is transported by a line body; the material picking and pressing mechanism 700 is installed at the top of the workbench 200 to take away the material stored on the material dividing mechanism 500 and assemble it into the product on the flow fixture 600. The material in the feeding channel 300 is pushed into the dividing mechanism 500 for storage through the material error mechanism 400, and then the material stored on the dividing mechanism 500 is taken away by the material taking and pressing mechanism 700, and assembled into the product on the flow fixture 600, thereby realizing the assembly of the material in the inner hole of the product. The whole process is automated, the assembly efficiency is significantly improved, and the stability of the assembly quality is guaranteed.

[0041] Specifically, Figure 3 and Figure 4 As shown, the feeding channel 300 includes a guide plate 310, a reference block 320 and a second cross-shooting sensor 330. The guide plate 310 is horizontally arranged on the table surface of the workbench 200. There are two guide plates 310, which are arranged side by side at intervals. The bottom ends of the opposite sides of the guide plates 310 are symmetrically provided with grooves 311. The reference block 320 is arranged at intervals on the right side of the guide plate 310. The second cross-shooting sensor 330 is arranged at the top of the reference block 320 and the bottom end of the workbench 200. The middle part of the workbench 200 is provided with an avoidance through hole 220. The material enters the feeding channel 300 in an orderly manner from the vibration plate and the straight vibration track (not shown in the figure). The material moves horizontally along the groove 311 until the material contacts the reference block 320. At this time, the material covers the avoidance through hole 220, and the second cross-shooting sensor 330 senses the material, and the material error mechanism 400 pushes the material into the material distribution mechanism 500.

[0042] like Figure 3 and Figure 5As shown, the material picking and pressing mechanism 700 includes a bracket 710, a two-dimensional motion component 720 and a material picking and pressing component 730. The bracket 710 is horizontally installed at the top rear of the workbench 200, the two-dimensional motion component 720 is installed on the bracket 710, and the material picking and pressing component 730 is vertically installed at the driving end of the two-dimensional motion component 720. The two-dimensional motion component 720 drives the material picking and pressing component 730 to move horizontally to the top of the material distribution mechanism 500, and then drives the material picking and pressing component 730 to rise and fall to pick up the material. After the material picking is completed, the material picking and pressing component 730 is driven to move horizontally to the top of the flow fixture 600, and finally drives the material picking and pressing component 730 to descend to press the material. Specifically, the two-dimensional motion component 720 includes a horizontal module 721 and a vertical module 722. The horizontal module 721 is installed at the top of the bracket 710, and the vertical module 722 is installed on the slide of the horizontal module 721. The material picking and pressing assembly 730 is installed on the slide of the vertical module 722. The material picking and pressing assembly 730 is divided into two groups, which are installed side by side on the slide of the vertical module 722 through a mounting plate, thereby realizing double-station material picking and pressing, and further improving the pressing efficiency.

[0043] like Figure 5-Figure 7 As shown, the material picking press-fitting assembly 730 includes a sleeve 731, a material picking shaft 732, a retaining ring 733, a return spring 734, a press-fitting sleeve 735, a rounded table 736 and a stopper 737. The sleeve 731 is a hollow structure. The material picking shaft 732 is coaxially arranged in the sleeve 731 and has a clearance fit with the sleeve 731. The top end of the material picking shaft 732 passes through a first through hole 7311 opened at the top end of the sleeve 731, and its bottom end passes through a second through hole 7312 opened at the bottom end of the sleeve 731. The retaining ring 733 and the return spring 734 are both arranged in the sleeve 731. The outer ring of the retaining ring 733 is supported on the annular ridge 738 formed on the inner wall of the sleeve 731, and its inner ring is supported on the shoulder 7321 formed in the middle of the material taking shaft 732. The top of the return spring 734 contacts the top wall of the sleeve 731, and its bottom contacts the top of the retaining ring 733. The press-fitting sleeve 735 is installed at the bottom end of the sleeve 731 and is sleeved on the material taking shaft 732. The rounded table 736 is installed at the bottom end of the material taking shaft 732. There are several limiters 737 installed on the bottom peripheral wall of the material taking shaft 732. Through the setting of the material taking press-fitting assembly 730, whether there is a step in the inner hole of the product, the material can be accurately assembled, and the compatibility is strong. Specifically, the limiting members 737 are evenly distributed along the circumference of the material taking shaft 732 ; the outer side surface of the limiting member 737 includes an arc surface 7371 , a straight surface 7372 and an inclined surface 7373 which are sequentially connected from top to bottom, and the inclined surface 7373 is seamlessly connected with the peripheral wall of the inverted rounded table 736 .

[0044] like Figure 3 , Figure 4 , Figure 8 and Fig. 9As shown, the material dispensing mechanism 500 includes a frame 510, a material dispensing motor 520, a rotating shaft 530, a material dispensing plate 540, a lifting column 550, a tightening spring 560 and a first matching sensor 570. The frame 510 is arranged below the workbench 200, and its top four corners are respectively connected to the workbench 200 through short shafts. The material dispensing motor 520 is vertically installed in the middle of the bottom end of the frame 510, and its output end is connected to the bottom end of the rotating shaft 530 through a coupling. The middle part of the rotating shaft 530 is rotatably connected to the middle part of the top end of the frame 510, and its top is connected to the middle part of the bottom end of the material dispensing plate 540. The material dispensing plate 540 is arranged at The lifting column 550 and the tightening spring 560 are both arranged in the step cavity 541 arranged in the material distribution plate 540, and the lifting column 550 and the step cavity 541 are slidably matched. The top of the tightening spring 560 contacts the bottom of the lifting column 550, and its bottom contacts the bottom wall of the step cavity 541. The top of the material distribution plate 540 is provided with a notch 542 connected to the step cavity 541. The first beam sensor 570 is arranged on the left and right sides of the front of the workbench 200, and the top of the material distribution plate 540 is provided with an avoidance channel 543. Specifically, the outer diameter of the top of the lifting column 550 is slightly larger than the inner diameter of the material, and smaller than the outer diameter of the material; the force of the reset spring 734 is greater than the force of the tightening spring 560; there are two notches 542, which are symmetrically arranged, and the cross section of the notch 542 is U-shaped.

[0045] During storage, the material error mechanism 400 first pushes a material in the feed channel 300 into a gap 542 of the material distribution plate 540, and then the material distribution motor 520 drives the material distribution plate 540 to rotate 180 degrees, and the material error mechanism 400 then pushes a material in the feed channel 300 into another gap 542 of the material distribution plate 540. When picking up materials, the two-dimensional motion component 720 drives the picking up and pressing component 730 to move horizontally to just above the material distribution mechanism 500, and then drives the picking up and pressing component 730 to descend until the picking up shaft 732 contacts and presses down the lifting column 550. The lifting column 550 descends in the step cavity 541 and squeezes the tightening spring 560. As the picking up shaft 732 descends, the inclined surface 7373 of the limit member 737 contacts the inner circle of the material and slightly stretches the material. Then the inner circle of the material slides over the straight surface 7372 of the limit member 737, and the material shrinks and contacts the curved surface 7371 of the limit member 737 to realize material picking. During press-fitting, the two-dimensional motion component 720 drives the material picking and pressing component 730 to move horizontally to just above the flow fixture 600, and then drives the material picking and pressing component 730 to descend until the material picking shaft 732 contacts the bottom wall of the product inner hole. As the vertical module 722 continues to drive the material picking and pressing component 730 to descend, the sleeve 731 compresses the return spring 734 and moves downward relative to the material picking shaft 732 until the material is peeled off the material picking shaft 732 to achieve assembly.

[0046] like Figure 3and Figure 4 As shown, the material error mechanism 400 includes a material error cylinder 410 and a material pusher block 420. The material error cylinder 410 is longitudinally mounted on the table top of the workbench 200, and its driving end is connected to the rear end of the material pusher block 420. The material pusher block 420 is longitudinally arranged on the workbench 200. The material error cylinder 410 drives the material pusher block 420 to move longitudinally to push the material into the notch 542.

[0047] like Figure 3 , Fig.10 and Fig.11 As shown, the circulation fixture 600 includes a bottom plate 610, a boss 620, a placement seat 630 and a stop pin 640. The bottom plate 610 is installed on the wire body, the boss 620 is installed in the middle of the top of the bottom plate 610, and the bottom end of the placement seat 630 is inserted into the fourth through hole 621 opened in the middle of the boss 620, and is detachably connected to the boss 620 through the stop pin 640. Through the setting of the stop pin 640, the placement seat 630 is detachably connected to the boss 620, which facilitates the rapid replacement of the placement seat 630 to be compatible with multiple products. Specifically, there are two bosses 620.

[0048] Example 2

[0049] A method for automatically assembling an annular workpiece, the steps are as follows:

[0050] S1. Loading: Materials are transported to the feeding channel 300 in an orderly manner;

[0051] S2. Material distribution: The material distribution mechanism 400 pushes the material in the feed channel 300 to the material distribution mechanism 500 for storage;

[0052] S3. Material taking and pressing: The material taking and pressing mechanism 700 takes the material stored on the material distribution mechanism 500 and assembles it into the product on the circulation fixture 600.

[0053] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic assembly device for annular workpieces, comprising a column (100), a workbench (200) longitudinally mounted on the top of the column (100), and a feed channel (300) transversely mounted in the middle of the workbench (200), characterized in that: Also includes: A material error mechanism (400) is longitudinally mounted on the rear portion of the workbench (200) to push out the material in the material supply channel (300); A material distribution mechanism (500) is vertically mounted at the front end of the workbench (200) to store materials pushed out of the material supply channel (300); The circulation jig (600) is arranged on the right side of the workbench (200) and is transported by the line body; And a material taking and pressing mechanism (700) is installed on the top of the workbench (200) to take away the materials stored on the material distribution mechanism (500) and assemble them into the products on the circulation fixture (600).

2. The automatic assembly device for annular workpieces according to claim 1, characterized in that: The material picking and pressing mechanism (700) comprises a bracket (710), a two-dimensional motion component (720) and a material picking and pressing component (730), wherein the bracket (710) is horizontally mounted at the top rear portion of the workbench (200), the two-dimensional motion component (720) is mounted on the bracket (710), and the material picking and pressing component (730) is vertically mounted at the driving end of the two-dimensional motion component (720).

3. The automatic assembly device for annular workpieces according to claim 2, characterized in that: The material taking and pressing assembly (730) comprises a sleeve (731), a material taking shaft (732), a retaining ring (733), a return spring (734), a pressing sleeve (735), a rounded table (736) and a stopper (737). The sleeve (731) is a hollow structure. The material taking shaft (732) is coaxially arranged in the sleeve (731) and is clearance-matched with the sleeve (731). The top end of the material taking shaft (732) passes through a first through hole (7311) provided at the top end of the sleeve (731), and the bottom end thereof passes through a second through hole (7312) provided at the bottom end of the sleeve (731). The retaining ring (733) and the return spring (734) are both arranged in the sleeve (731). 31), and is sleeved on the material taking shaft (732), the outer ring of the retaining ring (733) is supported on the annular ridge (738) formed on the inner wall of the sleeve (731), and the inner ring thereof is supported on the shaft shoulder (7321) formed in the middle of the material taking shaft (732), the top end of the reset spring (734) is in contact with the top wall of the sleeve (731), and the bottom end thereof is in contact with the top end of the retaining ring (733), the press-fitting sleeve (735) is installed at the bottom end of the sleeve (731), and is sleeved on the material taking shaft (732), the inverted truncated table (736) is installed at the bottom end of the material taking shaft (732), and the limiting members (737) are multiple and are installed on the peripheral wall of the bottom end of the material taking shaft (732).

4. The automatic assembly device for annular workpieces according to claim 3, characterized in that: The outer side surface of the limiting member (737) comprises a curved surface (7371), a straight surface (7372) and a sloped surface (7373) which are sequentially connected from top to bottom, and the sloped surface (7373) is seamlessly connected to the peripheral wall of the inverted frustum (736).

5. The automatic assembly device for annular workpieces according to claim 2, characterized in that: The two-dimensional motion component (720) includes a transverse module (721) and a vertical module (722), wherein the transverse module (721) is mounted on the top of the bracket (710), the vertical module (722) is mounted on the slide of the transverse module (721), and the material picking and pressing component (730) is mounted on the slide of the vertical module (722).

6. The automatic assembly device for annular workpieces according to claim 1, characterized in that: The material dispensing mechanism (500) comprises a frame (510), a material dispensing motor (520), a rotating shaft (530), a material dispensing plate (540), a lifting column (550), a tightening spring (560) and a first corresponding radiation sensor (570). The frame (510) is arranged below the workbench (200), and the four corners of the top end thereof are respectively connected to the workbench (200) via short shafts. The material dispensing motor (520) is vertically mounted at the middle of the bottom end of the frame (510), and the output end thereof is connected to the bottom end of the rotating shaft (530) via a coupling. The middle part of the rotating shaft (530) is rotatably connected to the middle part of the top end of the frame (510), and the top end thereof is connected to the middle part of the bottom end of the material dispensing plate (540). The material dispensing plate (540) is arranged above the workbench (510). The lifting column (550) and the tensioning spring (560) are both arranged in a step cavity (541) arranged in the material distribution plate (540). The lifting column (550) and the tensioning spring (560) are slidably matched with the step cavity (541). The top end of the tensioning spring (560) contacts the bottom end of the lifting column (550), and the bottom end of the tensioning spring (560) contacts the bottom wall of the step cavity (541). The top end of the material distribution plate (540) is provided with a notch (542) connected to the step cavity (541). The first matching sensor (570) is arranged on the left and right sides of the front end of the workbench (200). The top end of the material distribution plate (540) is provided with an avoidance channel (543).

7. The automatic assembly device for annular workpieces according to claim 1, characterized in that: The material error mechanism (400) comprises a material error cylinder (410) and a material push block (420). The material error cylinder (410) is longitudinally mounted on the table top of the workbench (200), and a driving end thereof is connected to the rear end of the material push block (420). The material push block (420) is longitudinally arranged on the workbench (200).

8. The automatic assembly device for annular workpieces according to claim 1, characterized in that: The circulation fixture (600) comprises a base plate (610), a boss (620), a placement seat (630) and a stop pin (640); the base plate (610) is mounted on the wire body; the boss (620) is mounted at the middle of the top end of the base plate (610); the bottom end of the placement seat (630) is inserted into a fourth through hole (621) provided in the middle of the boss (620), and is detachably connected to the boss (620) via the stop pin (640).

9. The automatic assembly device for annular workpieces according to claim 1, characterized in that: The feeding channel (300) comprises a guide plate (310), a reference block (320) and a second counter-radiation sensor (330); the guide plate (310) is transversely arranged on the table surface of the workbench (200); the guide plates (310) are two pieces, which are arranged side by side at intervals; grooves (311) are symmetrically provided at the bottom ends of opposite sides of the guide plates (310); the reference blocks (320) are arranged at intervals on the right side of the guide plates (310); the second counter-radiation sensor (330) is arranged at the top end of the reference block (320) and the bottom end of the workbench (200); and an avoidance through hole (220) is provided in the middle of the workbench (200).

10. An assembly method based on the annular workpiece automatic assembly device according to any one of claims 1 to 9, characterized in that: Here are the steps: S1. Loading: Materials are transported to the feeding channel (300) in an orderly manner; S2. Material distribution: the material error mechanism (400) pushes the material in the feeding channel (300) into the material distribution mechanism (500) for storage; S3. Material taking and pressing: The material taking and pressing mechanism (700) takes the material stored on the material distribution mechanism (500) and assembles it into the product on the circulation fixture (600).

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