A device and method for automatically installing a seal ring on a cylindrical part

Abstract

The present application belongs to the field of aero-engine fuel regulator assembly, and particularly relates to a device and method for automatically installing sealing rings on cylindrical parts. The device comprises a bottom plate, a module motor mounting support plate, a module servo motor, a displacement sensor a, a lead screw, a module bottom plate, a module slide plate, a clamping tool, an inflation expansion sleeve, a push rod, a large gear, a support plate, a positioning shaft, a guide key, a mounting plate, an air pipe, an air source, a gear servo motor, a pinion, a module support plate, a displacement sensor b, and a sealing ring. The device expands the rubber expansion sleeve to expand the sealing ring, and uses the automatic device to push the sealing ring into the sealing groove to realize the automatic assembly of different sizes and quantities of O-shaped sealing rings. The present application has the advantages of simple structure design, convenient assembly operation, high installation precision, stable structure, long service life, automatic assembly instead of manual assembly, and no damage to the sealing ring.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of assembling an aero-engine fuel regulator, and relates to the field of assembling an O-shaped sealing ring on a cylindrical part, and particularly relates to a device and a method for automatically assembling a sealing ring on a cylindrical part. BACKGROUND

[0002] In an aero-engine fuel regulating system, an O-shaped sealing ring is a key part that plays a sealing role, and the installation quality of the O-shaped sealing ring has an important influence on the performance of the engine. Manual assembly is the main assembly method for the sealing ring, and the assembly efficiency is low, the consistency is poor, and there is a certain quality risk. For example, manual assembly is easy to bring in excess material, causing pollution or blockage of the fuel system; and when assembling the sealing ring on a threaded sharp edge part, the sealing ring is easy to be damaged.

[0003] The O-shaped sealing ring automatic assembly device is designed to improve the assembly efficiency and quality. SUMMARY

[0004] The purpose of the application is to design a device and a method for automatically assembling a sealing ring on a cylindrical part, so as to improve the installation efficiency and quality of the O-shaped sealing ring.

[0005] The technical scheme of the application is:

[0006] The utility model provides a kind of device for automatically installing sealing ring on cylindrical part, including bottom plate 1, module motor installation support plate 2, module servo motor 3, displacement sensor a 4, lead screw 5, module bottom plate 6, module slide plate 7, clamping tool 8, inflatable sleeve 9, push rod 10, large gear 11, support plate 12, positioning shaft 13, guide key 14, mounting plate 15, air pipe 16, gas source 17, gear servo motor 18, pinion 19, module support plate 20, displacement sensor b 21, sealing ring 23;Bottom plate 1 left end installs gas source 17, vertically installs mounting plate 15, support plate 12 in turn to right, right end is module bottom plate 6;The gas source 17 is connected with positioning shaft 13 by air pipe 16, and pressure gas is hit into inflatable sleeve 9 air bag during work;There are two installation positions above the mounting plate 15, respectively install positioning shaft 13 and displacement sensor 21;Positioning shaft 13 is pressed fit with mounting plate 15 hole and fastened;There are two mounting holes on the support plate 12, respectively install gear servo motor 18 and large gear 11, pinion 19 is installed on the rotating shaft of gear servo motor 18;Push rod 10 is installed into the hole of large gear 11, is connected by rectangular thread pair, positioning shaft 13 is installed into the hole of push rod 10;Positioning shaft 13 is installed guide key 14, and guide key 14 is slidably fitted with the key groove of push rod 10 without gap;Inflatable sleeve 9 is inserted into the hole of positioning shaft 13 and push rod 10, and is locked with positioning shaft 13;Inflatable sleeve 9 right end has thin-walled air bag;The both ends of module bottom plate 6 install module motor installation support plate 2 and module support plate 20, and install module slide plate 7 in the middle;Lead screw 5 is installed in the mounting hole of module motor installation support plate 2 and module support plate 20 respectively, and the parallelism of the "U" groove of lead screw 5 and bottom plate 6 is 0.01mm;Module servo motor 3 is installed on module motor installation support plate 2, and the rotating shaft of motor is connected with lead screw 5;Module slide plate 7 is installed in the sliding groove of module bottom plate 6, and is connected with lead screw 5 by screw transmission pair;Clamping tool 8 is installed on module slide plate 7, and part 22 is installed on clamping tool 8;

[0007] The module bottom plate 6 is rectangular, and the parallelism of upper and lower surfaces is 0.01mm, the cross section is "U" shape, the parallelism of two sides of "U" is 0.005mm, the perpendicularity to bottom surface is 0.005mm, and the surface roughness Ra is above 0.4.

[0008] There is one mounting hole in the middle of module motor installation support plate 2 and module support plate 20 respectively, and the coaxiality is 0.005mm.

[0009] The middle of lead screw 5 is outer screw thread, and both ends are cylinder, which are matched with the holes of module motor installation support plate 2 and module support plate 20 respectively, and the gap is 0.005mm; The straightness of lead screw 5 is 0.01mm.

[0010] The module slide plate 7 is "convex" shape, the convex side surface is matched with the "U" shape groove of the module bottom plate 6, the clearance is 0.005mm; the step surface is contacted with the upper end surface of the module bottom plate 6, the roughness is above 0.4; the module slide plate 7 is vertically distributed with two holes, the lower hole is the internal screw thread hole matched with the screw rod 5, the coaxiality is 0.005mm.

[0011] The inflation sleeve 9 is the split structure, which is composed of the air pipe and the expansion rubber, the expansion rubber has the air bag, when the air pipe is not connected, the expansion rubber is contracted; when the air pipe is connected, the expansion rubber is expanded, the right end is the cylindrical sleeve structure, the hole is matched with the clearance with the outer circle of the part 22, the clearance is 0.02-0.05mm, the wall thickness is 0.5mm; the air pipe is inserted into the expansion rubber and connected to the air bag.

[0012] The coaxiality of the clamping tool 8, the inflation sleeve 9 and the positioning shaft 13 is φ0.01mm.

[0013] The clearance between the hole of the push rod 10 and the outer circle of the positioning shaft 13 and the inflation sleeve 9 is not more than 0.01mm.

[0014] The outer circle of the push rod 10 is connected with the hole rectangular thread pair of the large gear 11, the horizontal moving precision is 0.02mm / 100mm.

[0015] The large gear 11 is connected with the small gear 19 by the gear pair, without the meshing clearance.

[0016] The left end of the clamping tool 8 can be automatically expanded, the part 22 is tightly supported, the right end is matched with the installation hole of the module slide plate 7 without the clearance.

[0017] The module slide plate 7 is connected with the screw rod 5 by the ball screw form, the horizontal moving precision is 0.02mm / 100mm.

[0018] The clearance between the hole of the inflation sleeve 9 and the outer circle of the part 22 is 0.02-0.05mm, the wall thickness is 0.5mm.

[0019] The push rod 10 is the non-metallic material with high strength and high elasticity, the hole has the key groove.

[0020] The side surface of the guide key 14 is interference matched with the groove of the positioning shaft 13, the clearance with the key groove of the push rod 10 is 0.005mm, the parallelism with the central axis is 0.005mm.

[0021] The displacement sensor a4 feeds back the position of the module slide plate 7, the position of the sealing groove of the part 22 is controlled by the numerical control program and the module servo motor 3.

[0022] The displacement sensor b21 feeds back the position of the push rod 10, the position of the sealing ring 23 is controlled by the numerical control program and the gear servo motor 18;

[0023] The displacement sensor a4 and the displacement sensor b21 are non-contact displacement sensors with a measurement accuracy of 0.05mm;

[0024] When in use, the outer cylindrical surface of the inflatable sleeve 9 should be smeared with lubricating grease;

[0025] A mounting method of a device for automatically mounting sealing rings on cylindrical parts: the sealing ring 23 is an elastic member, and the inner hole diameter is smaller than the outer circle of the sealing groove of the part 22; the sealing ring 23 needs to be expanded to pass through the outer circle of the sealing groove of the part 22 and then be put into the sealing groove of the part 22; before use, the numerical control program control module slide plate 7 and the push rod 10 are moved to the coordinate origin; the inflatable sleeve 9 matching the size of the sealing ring 23 is installed in the positioning shaft 13 and is fastened; the gas source 17 is not working, there is no pressure gas in the device, and the inflatable sleeve 9 is in a contracted state; four parts 22 are sleeved on the outer circle of the contracted inflatable sleeve 9, at this time the gas source 17 works, the pressure gas is punched into the air bag of the inflatable sleeve 9 through the air pipe 16 and the hole in the positioning shaft 13, and the air bag is expanded; the part 22 is mounted on the clamping tool 8, and the clamping tool 8 is mounted on the support plate 7, so that the coaxiality of the part 22 and the inflatable sleeve 9 is not greater than φ0.01mm; the numerical control program control module servo motor 3 is rotated to drive the lead screw 5 to rotate, the module slide plate 7 is moved, the movement position of the part 22 is controlled through the displacement sensor a4 and the numerical control program, the part 22 is stopped when the left side of the sealing groove of the part 22 is flush with the left end of the inflatable sleeve 9, and the first sealing groove from the right side is started; the numerical control program control gear servo motor 18 drives the pinion 19 to rotate, and drives the large gear 11 to rotate, the push rod 10 is driven to move to the right side through the threaded pair, the hole of the push rod 10 is larger than the outer circle of the inflatable sleeve 9 by 0.2-0.3mm, the sealing ring 23 can be pushed along the inflatable sleeve 9 until the right end, so that the sealing ring 23 falls into the sealing groove of the part 22; the module servo motor 3 is controlled to drive the part 22 to move to the right, so that the right end surface of the inflatable sleeve 9 is flush with the left end of the second sealing groove; the gear servo motor 18 is controlled to rotate to drive the push rod 10 to move to the right, and the second sealing ring is pushed into the second sealing groove; according to the number of sealing rings to be installed, the above process is repeated; after the installation of the sealing ring is completed, the module slide plate 7 and the push rod 10 are moved to the coordinate origin, and the part 22 is taken off, and the installation is completed.

[0026] The advantages of the present application are: the present application expands the sealing ring through the expansion of the rubber sleeve, pushes the sealing ring into the sealing groove by using the automatic device, and realizes the automatic assembly of O-shaped sealing rings with different sizes and different numbers. The present application has the advantages of simple structure design, convenient assembly operation, high installation precision, stable structure, long service life, automatic assembly instead of manual assembly, and non-metal material of the part in contact with the sealing ring without damage to the sealing ring. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1is a part assembly diagram;

[0028] Figure 2 is an assembly device top view;

[0029] Figure 3 is an assembly device sectional view A-A;

[0030] Figure 4 is an assembly device sectional view B-B;

[0031] Figure 5 is an assembly device sectional view C-C;

[0032] Figure 6 is an assembly device three-dimensional view;

[0033] Figure 7 is an inflatable sleeve 9 diagram.

[0034] In the figure, 1 - base plate, 2 - module motor mounting support plate, 3 - module servo motor, 4 - displacement sensor a, 5 - lead screw, 6 - module base plate, 7 - module slide plate, 8 - clamping tool, 9 - inflatable sleeve, 10 - push rod, 11 - large gear, 12 - support plate, 13 - positioning shaft, 14 - guide key, 15 - mounting plate, 16 - air pipe, 17 - air source, 18 - gear servo motor, 19 - small gear, 20 - module support plate, 21 - displacement sensor b, 22 - part, 23 - sealing ring. DETAILED DESCRIPTION

[0035] The application will be further described in detail below in combination with the drawings. See Figures 2-5 .

[0036] The utility model provides a kind of automatic installation sealing ring's device on cylindrical part, and the assembly device for automatically installing sealing ring into annular sealing groove of cylindrical part is characterized by comprising bottom plate 1, module motor installation support plate 2, module servo motor 3, displacement sensor a 4, lead screw 5, module bottom plate 6, module sliding plate 7, clamping tool 8, inflatable sleeve 9, push rod 10, large gear 11, support plate 12, positioning shaft 13, guide key 14, mounting plate 15, air pipe 16, gas source 17, gear servo motor 18, pinion 19, module support plate 20, displacement sensor b 21, sealing ring 23;Bottom plate 1 is rectangle, left end installs gas source 17, vertically installs mounting plate 15, support plate 12 in turn to right, right end is module bottom plate 6;The gas source 17 can provide 2bar or more pressure compressed gas, be connected with positioning shaft 13 by air pipe 16, and pressure gas is hit into inflatable sleeve 9 air bag in working time;There are two installation positions on the mounting plate 15, respectively install positioning shaft 13 and displacement sensor 21, and the distance from bottom edge is consistent;Positioning shaft 13 is pressed fit with mounting plate 15 hole and fastened;There are two installation holes on the support plate 12, respectively install gear servo motor 18 and large gear 11, and the vertical direction position of both is consistent;The coaxiality of the installation hole of mounting plate 15, positioning shaft 13 and the installation hole of large gear of support plate 12 is 0.005mm;Pinion 19 is installed on the rotating shaft of gear servo motor 18, and pinion 19 and large gear 11 form gear pair, and are engaged without clearance;Push rod 10 is installed into the hole of large gear 11, is connected by rectangular thread pair, and positioning shaft 13 is installed into the hole of push rod 10, and is engaged without clearance slidingly;Positioning shaft 13 is installed guide key 14, and guide key 14 is engaged without clearance slidingly with the key groove of push rod 10;Inflatable sleeve 9 is inserted into the hole of positioning shaft 13 and push rod 10, and is locked with positioning shaft 13;Inflatable sleeve 9 right end has thin-walled air bag, shrinks when no gas, expands when inflation, and after expanding, right end hole diameter is 0.02-0.05mm larger than the size of part 22 outer circle, wall thickness is 0.5mm, and hole depth is greater than the distance of sealing ring installation position from part end face;The both ends of module bottom plate 6 are installed module motor installation support plate 2 and module support plate 20, and module sliding plate 7 is installed in the middle;Lead screw 5 is installed in the installation hole of module motor installation support plate 2 and module support plate 20 respectively, and the parallelism of lead screw 5 and the "U" groove of bottom plate 6 is 0.01mm;Module servo motor 3 is installed on module motor installation support plate 2, and motor rotating shaft is connected with lead screw 5;Module sliding plate 7 is installed in the sliding groove of module bottom plate 6, is engaged without clearance slidingly, and is connected with lead screw 5 through screw transmission pair;Clamping tool 8 is installed on module sliding plate 7, and part 22 is installed on clamping tool 8;

[0037] Module bottom plate 6 is rectangle, and the parallelism of upper and lower faces is 0.01mm, the cross section is "U" shape, the parallelism of "U" two side faces is 0.005mm, the perpendicularity with bottom face is 0.005mm, and the surface roughness Ra is above 0.4.

[0038] The module base plate 6 has two installation holes in the middle of the module motor installation support plate 2 and the module support plate 20 respectively, and the coaxiality is 0.005 mm.

[0039] The middle of the screw rod 5 is an external screw thread, and the two ends are cylinders, which are matched with the holes of the module motor installation support plate 2 and the module support plate 20 respectively, and the clearance is 0.005 mm; the linearity of the screw rod 5 is 0.01 mm.

[0040] The module slide plate 7 is in the shape of "convex", and the two side surfaces of the convex part are matched with the "U" shaped groove of the module base plate 6 with a clearance of 0.005 mm; the stepped surface is in contact with the upper end surface of the module base plate 6 with a roughness Ra of 0.4 or more; the module slide plate 7 has two holes vertically distributed, and the lower hole is an internal screw thread hole matched with the screw rod 5 with a coaxiality of 0.005 mm.

[0041] The inflatable sleeve 9 is a split structure composed of an air pipe and an inflatable rubber, and the inflatable rubber has an air bag. When there is no air, the inflatable rubber is contracted; when there is air, the inflatable rubber is expanded. The right end is a cylindrical sleeve structure, and the hole is matched with the outer circle of the part 22 with a clearance of 0.02-0.05 mm, and the wall thickness is 0.5 mm. The air pipe is inserted into the inflatable rubber and connected to the air bag, and is sealed by bonding, so that the air bag cavity is only connected with the outside through the air inlet.

[0042] The coaxiality of the clamping tool 8, the inflatable sleeve 9 and the positioning shaft 13 is φ0.01 mm.

[0043] The clearance between the hole in the push rod 10 and the outer circle of the positioning shaft 13 and the inflatable sleeve 9 is not more than 0.01 mm.

[0044] The outer circle of the push rod 10 is connected with the rectangular thread pair of the hole of the large gear 11, and the horizontal movement precision is 0.02 mm / 100 mm.

[0045] The large gear 11 and the small gear 19 are connected by a gear pair without meshing clearance.

[0046] The left end of the clamping tool 8 can automatically expand to tightly support the part 22, and the right end is matched with the installation hole of the module slide plate 7 without clearance.

[0047] The module slide plate 7 and the screw rod 5 are connected by a ball screw form, and the horizontal movement precision is 0.02 mm / 100 mm.

[0048] The hole in the right end of the inflatable sleeve 9 is matched with the outer circle of the part 22 with a clearance of 0.02-0.05 mm, and the wall thickness is 0.5 mm.

[0049] The push rod 10 is made of a non-metallic material with high strength and high elasticity, and the hole has a key groove.

[0050] The guide key 14 side with positioning shaft 13 groove interference fit, with push rod 10 key groove clearance fit, clearance 0.005mm, parallelism with the center axis 0.005mm.

[0051] The displacement sensor a4 feedback module skateboard 7 position, through numerical control program and module servo motor 3 control parts 22 sealing groove position.

[0052] The displacement sensor b21 feedback push rod 10 position, through numerical control program and gear servo motor 18 control sealing ring 23 out of position;

[0053] The device is automatic control, can realize different parts, different specifications of sealing ring automatic assembly; different specifications of sealing assembly need to replace the matching inflatable sleeve 9; different position need to compile different numerical control program;

[0054] Through the industrial robot (mechanical hand) dress and dress clamp tool, can realize automatic; installation visual identification system, can realize the automatic detection of installation process and result;

[0055] The large gear and the small gear are small modulus gear, modulus 0.5;

[0056] The displacement sensor a4 and the displacement sensor b21 are non contact displacement sensor, measurement accuracy 0.05mm;

[0057] When using, the inflatable sleeve 9 outer cylindrical surface should be smeared with lubricating grease;

[0058] The principle is that the sealing ring 23 is an elastic member, the inner hole diameter is smaller than the outer circle of the sealing groove of the part 22, the sealing ring 23 needs to be expanded to pass through the outer circle of the sealing groove of the part 22 and then put into the sealing groove of the part 22; before use, the numerical control program control module slide plate 7 and the push rod 10 are moved to the coordinate origin (the right side is the coordinate origin of the module slide plate 7, and the left side is the coordinate origin of the push rod 10); the inflatable expansion sleeve 9 matched with the size of the sealing ring 23 is installed in the positioning shaft 13 and fastened; the gas source 17 is not working, there is no pressure gas in the device, and the inflatable expansion sleeve 9 is in a contracted state; the four parts 22 are sleeved on the outer circle of the contracted inflatable expansion sleeve 9, at this time the gas source 17 works, the pressure gas is punched into the air bag of the inflatable expansion sleeve 9 through the air pipe 16 and the hole of the positioning shaft 13, and the air bag is expanded; the part 22 is installed on the clamping tool 8, and the clamping tool 8 is installed on the support plate 7, so that the coaxiality of the part 22 and the inflatable expansion sleeve 9 is not greater than φ0.01mm; the numerical control program control module servo motor 3 is rotated to drive the lead screw 5 to rotate, the module slide plate 7 is moved, the displacement sensor a4 and the numerical control program are used to control the moving position of the part 22, the part 22 is stopped when the left side of the sealing groove of the part 22 is flush with the left end of the inflatable expansion sleeve 9, and the first sealing groove from the right side is started; the numerical control program control gear servo motor 18 drives the pinion 19 to rotate and drives the large gear 11 to rotate, the push rod 10 is driven to move to the right side through the threaded pair, the push rod 10 hole is 0.2-0.3mm larger than the outer circle of the inflatable expansion sleeve 9, the sealing ring 23 can be pushed along the inflatable expansion sleeve 9, and the sealing ring 23 is pushed to the right end until the sealing ring 23 falls into the sealing groove of the part 22; the module servo motor 3 is controlled to drive the part 22 to move to the right, so that the right end surface of the inflatable expansion sleeve 9 is flush with the left end of the second sealing groove; the gear servo motor 18 is controlled to rotate to drive the push rod 10 to move to the right, and the second sealing ring is pushed into the second sealing groove; according to the number of sealing rings to be installed, the above process is repeated; after the installation of the sealing ring is completed, the module slide plate 7 and the push rod 10 are moved to the coordinate origin, and the part 22 is taken off, and the installation is completed.

Claims

1. A device for automatically installing a sealing ring on a cylindrical part, characterized in that: Includes a base plate (1), a module motor mounting plate (2), a module servo motor (3), a displacement sensor a4, a lead screw (5), a module base plate (6), a module slide plate (7), a clamping fixture (8), an inflation sleeve (9), a push rod (10), a large gear (11), a support plate (12), a positioning shaft (13), a guide key (14), a mounting plate (15), an air pipe (16), an air source (17), a gear servo motor (18), a small gear (19), a module support plate (20), a displacement sensor b (21), and a sealing ring (23); the air source is installed on the left end of the base plate (1). (17) Vertically install the mounting plate (15) and support plate (12) to the right, with the module base plate (6) at the right end; The air source (17) is connected to the positioning shaft (13) through the air pipe (16), and pressurized gas is injected into the air bladder of the inflation sleeve (9) during operation; There are two mounting positions on the top of the mounting plate (15), where the positioning shaft (13) and displacement sensor b (21) are installed respectively; The positioning shaft (13) and the mounting plate (15) are press-fitted and fastened; There are two mounting holes on the support plate (12), where the gear servo motor (18) and the large gear (11) and the small gear (12) are installed respectively. 9) Installed on the rotating shaft of the gear servo motor (18); the push rod (10) is installed into the hole of the large gear (11) and connected by a rectangular thread pair; the positioning shaft (13) is installed into the middle hole of the push rod (10); the guide key (14) is installed on the positioning shaft (13), and the guide key (14) slides with the keyway of the push rod (10) without clearance; the inflatable sleeve (9) is inserted into the middle hole of the positioning shaft (13) and the push rod (10) and locked with the positioning shaft (13); the right end of the inflatable sleeve (9) has a thin-walled airbag; the module base plate (6) is equipped with module motor mounting plate (2) and module support plate (2) at both ends. 0), the middle module slide plate (7) is installed; the two ends of the lead screw (5) are respectively installed in the mounting holes of the module motor mounting support plate (2) and the module support plate (20), and the parallelism between the lead screw (5) and the "U" groove of the module base plate (6) is 0.01mm; the module servo motor (3) is installed on the module motor mounting support plate (2), and the motor rotation shaft is connected to the lead screw (5); the module slide plate (7) is installed in the slide groove of the module base plate (6) and connected to the lead screw (5) through the lead screw transmission pair; the clamping fixture (8) is installed on the module slide plate (7), and the part (22) is installed on the clamping fixture (8).

2. The device for automatically installing a sealing ring on a cylindrical part according to claim 1, characterized in that: The module base plate (6) is rectangular, with a parallelism of 0.01mm between the top and bottom surfaces, a "U" shaped cross section, a parallelism of 0.005mm between the two sides of the "U", a perpendicularity of 0.005mm to the bottom surface, and a surface roughness of Ra0.4 or higher.

3. The device for automatically installing a sealing ring on a cylindrical part according to claim 1, characterized in that: There is one mounting hole in the middle of the module motor mounting plate (2) and the module support plate (20), with a coaxiality of 0.005mm.

4. The device for automatically installing a sealing ring on a cylindrical part according to claim 1, characterized in that: The lead screw (5) has an external lead screw thread in the middle and cylindrical ends, which respectively mate with the holes of the module motor mounting plate (2) and the module support plate (20), with a clearance of 0.005mm; the straightness of the lead screw (5) is 0.01mm.

5. The device for automatically installing a sealing ring on a cylindrical part according to claim 1, characterized in that: The module slide plate (7) is "convex" shaped, and the two side surfaces of the convex part are fitted with the "U" - shaped groove of the module base plate (6) with a clearance of 0.005 mm; the step surface contacts the upper end surface of the module base plate (6) with a roughness Ra of more than 0.4; there are 2 holes vertically distributed on the module slide plate (7). The lower hole is an internal screw thread hole, which is fitted with the screw rod (5) with a coaxiality of 0.005 mm.

6. The device for automatically installing a sealing ring on a cylindrical part according to claim 1, characterized in that: The inflatable expansion sleeve (9) is a split structure, composed of an air pipe and expanding rubber. The expanding rubber has an airbag. When not inflated, it shrinks; after inflation, it expands. The right end is a cylindrical sleeve structure. The hole has a clearance fit with the outer circle of the part (22) with a clearance of 0.02 - 0.05 mm and a wall thickness of 0.5 mm; the air pipe is inserted into the expanding rubber and leads to the airbag and is adhesively sealed.

7. The device for automatically installing a sealing ring on a cylindrical part according to claim 1, characterized in that: The coaxiality of the clamping tooling (8), the inflatable expansion sleeve (9) and the positioning shaft (13) is φ0.01 mm.

8. The device for automatically installing a sealing ring on a cylindrical part according to claim 1, characterized in that: The clearance between the middle hole of the push rod (10) and the outer circles of the positioning shaft (13) and the inflatable expansion sleeve (9) is not more than 0.01 mm.

9. The device for automatically installing a sealing ring on a cylindrical part according to claim 1, characterized in that: The outer circle of the push rod (10) is connected with the hole of the large gear (11) by a rectangular thread pair with a horizontal movement accuracy of 0.02 mm / 100 mm.

10. The device for automatically installing a sealing ring on a cylindrical part according to claim 1, characterized in that: The large gear (11) and the small gear (19) are connected by a gear pair with no meshing clearance.

11. The device for automatically installing a sealing ring on a cylindrical part according to claim 1, characterized in that: The left end of the clamping tooling (8) automatically expands to tighten the part (22), and the right end has a clearance - free fit with the mounting hole of the module slide plate (7).

12. The device for automatically installing a sealing ring on a cylindrical part according to claim 1, characterized in that: The module slide plate (7) and the screw rod (5) are connected in the form of a ball screw with a horizontal movement accuracy of 0.02 mm / 100 mm.

13. The device for automatically installing a sealing ring on a cylindrical part according to claim 1, characterized in that: The hole at the right end of the inflatable expansion sleeve (9) has a clearance fit with the outer circle of the part (22) with a clearance of 0.02 - 0.05 mm and a wall thickness of 0.5 mm.

14. The device for automatically installing a sealing ring on a cylindrical part according to claim 1, characterized in that: The push rod (10) is made of non - metallic material and has a keyway in the middle hole.

15. The device for automatically installing a sealing ring on a cylindrical part according to claim 1, characterized in that: The side surface of the guide key (14) has an interference fit with the groove of the positioning shaft (13) and a clearance fit with the keyway of the push rod (10) with a clearance of 0.005 mm and a parallelism with the central axis of 0.005 mm.

16. The device for automatically installing a sealing ring on a cylindrical part according to claim 1, characterized in that: The displacement sensor a4 feedbacks the position of the module slide plate (7), and controls the position of the sealing groove of the part (22) through the numerical control program and the module servo motor (3).

17. The device for automatically installing a sealing ring on a cylindrical part according to claim 1, characterized in that: The displacement sensor b (21) feedbacks the position of the push rod (10), and controls the position where the sealing ring (23) disengages through the numerical control program and the gear servo motor (18).

18. The device for automatically installing a sealing ring on a cylindrical part according to claim 1, characterized in that: The displacement sensor a4 and the displacement sensor b (21) are non - contact displacement sensors with a measurement accuracy of 0.05 mm.

19. A method for installing a device for automatically installing a sealing ring on a cylindrical part: characterized in that, Using the device as described in any one of claims 1-18, the sealing ring (23) is an elastic element with an inner diameter smaller than the outer circle of the sealing groove of the part (22). The sealing ring (23) needs to be expanded to pass through the outer circle of the sealing groove of the part (22) before being placed into the sealing groove of the part (22). Before use, the CNC program controls the module slide plate (7) and push rod (10) to move to the coordinate origin. The inflatable expansion sleeve (9) matching the size of the sealing ring (23) is installed into the positioning shaft (13) and tightened. The air source (17) is not working, there is no pressurized gas in the device, and the inflatable expansion sleeve (9) is in a position where In the contracted state, four parts (22) are fitted onto the outer circle of the contracted inflatable sleeve (9). At this time, the air source (17) is working, and pressurized gas is injected into the air bladder of the inflatable sleeve (9) through the air pipe (16) and the central hole of the positioning shaft (13), causing the air bladder to expand. The parts (22) are mounted on the clamping fixture (8), and the clamping fixture (8) is mounted on the support plate 7 to ensure that the coaxiality between the parts (22) and the inflatable sleeve (9) is not greater than φ0.01mm. The module servo motor (3) is controlled to rotate by the CNC program, which drives the lead screw (5) to rotate and moves the module slide plate (7). The displacement sensor a4 and the CNC program control the movement of part (22) to ensure that the left side of the sealing groove of part (22) is flush with the left end of the inflatable sleeve (9) and stop. Starting from the first sealing groove on the far right, the CNC program controls the gear servo motor (18) to drive the small gear (19) to rotate and drive the large gear (11) to rotate. The push rod (10) is driven to move to the right through the threaded pair. The opening of the push rod (10) is 0.2 to 0.3 mm larger than the outer circle of the inflatable sleeve (9), which can push the sealing ring (23) to move along the inflatable sleeve (9) until... Push to the right end to make the sealing ring (23) fall into the sealing groove of the part (22); control the module servo motor (3) to drive the part (22) to move to the right so that the right end face of the inflatable sleeve (9) is flush with the left end of the second sealing groove; control the gear servo motor (18) to rotate and drive the push rod (10) to move to the right to push the second sealing ring into the second sealing groove; repeat the above process according to the number of sealing rings to be installed; after the sealing ring is installed, control the module slide plate (7) and push rod (10) to move to the coordinate origin, remove the part (22), and the installation is completed.

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