Device and method for automatically installing sealing ring on cylindrical part

Abstract

The invention belongs to the field of aero-engine fuel regulator assembling, and particularly relates to a device and method for automatically installing a sealing ring on a cylindrical part. Comprising a bottom plate, a module motor mounting supporting plate, a module servo motor, a displacement sensor a, a lead screw, a module bottom plate, a module sliding plate, a clamping tool, an inflation expansion sleeve, a push rod, a large gear, a supporting plate, a positioning shaft, a guide key, a mounting plate, an air pipe, an air source, a gear servo motor, a small gear, a module supporting plate, a displacement sensor b and a sealing ring. The sealing rings are expanded through expansion of the rubber expansion sleeve, and the sealing rings are pushed into the sealing grooves through the automatic device, so that automatic assembly of O-shaped sealing rings of different sizes and specifications and different numbers is achieved. The device is simple in structural design and convenient to assemble and operate; the device is high in mounting precision, stable in structure and long in service life; manual assembly is replaced by automatic assembly; and parts in contact with the sealing ring are made of nonmetal, so that the sealing ring is not damaged.

Description

Technical Field

[0001] The invention belongs to the field of aviation engine fuel regulator assembly, relates to the technical field of O-ring assembly of cylindrical parts, and specifically relates to a device and method for automatically installing a sealing ring on a cylindrical part. Background Art

[0002] In the fuel regulating system of aircraft engines, the O-ring is a key component that plays a sealing role. Its installation quality has a significant impact on the performance of the engine. Manual assembly is the main way to assemble the seal, which has low assembly efficiency, poor consistency, and certain quality risks. For example, manual assembly is prone to bring in excess materials, causing contamination or blockage of the fuel system; it is easy to damage the seal when assembling it on a part with a threaded sharp edge.

[0003] By designing an automatic installation device for O-rings, the assembly efficiency and quality can be improved. Summary of the invention

[0004] The purpose of the present invention is to design a device and method for automatically installing a sealing ring on a cylindrical part to improve the installation efficiency and quality of the O-ring.

[0005] The technical solution of the present invention is:

[0006] A device for automatically installing a sealing ring on a cylindrical part, comprising a base plate 1, a module motor mounting support 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 tool 8, an inflatable expansion 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 b21, and a sealing ring 23; a base plate 1, a module motor mounting support plate 20, a module servo motor mounting support plate 21, and a displacement sensor b21, and a sealing ring 23; a base plate 1, a module motor mounting support plate 22, a module servo motor mounting support plate 23, a module servo motor mounting support plate 24, a module servo motor mounting support plate 25, a module servo motor mounting support plate 26, a module servo motor mounting support plate 27, a module servo motor mounting support plate 28, a module servo motor mounting support plate 29, a module servo motor mounting support plate 30, a module servo motor mounting support plate 31, a module servo motor mounting support plate 32, a module servo motor mounting support plate 33, a module servo motor mounting support plate 34, a module servo motor mounting support plate 35, a module servo motor mounting support plate 36, a module servo motor mounting support plate 37, a module servo motor mounting support plate 38, a module servo motor mounting support plate 39, a module servo motor mounting support plate 31, a module servo motor mounting support plate 32, a module servo motor mounting support plate 34, a module servo motor mounting support plate 35, a The air source 17 is installed at the left end of the plate 1, and the mounting plate 15 and the support plate 12 are installed vertically in sequence to the right, and the right end is the module bottom plate 6; the air source 17 is connected to the positioning shaft 13 through the air pipe 16, and the pressurized gas is injected into the airbag of the inflatable sleeve 9 during operation; there are two mounting positions above the mounting plate 15, respectively mounting the positioning shaft 13 and the displacement sensor 21; the positioning shaft 13 is press-fitted and fastened with the hole of the mounting plate 15; there are two mounting holes on the support plate 12, respectively mounting the gear servo motor 18 and the large gear 1 1. The pinion 19 is installed on the rotating shaft of the gear servo motor 18; the push rod 10 is installed in the hole of the large gear 11, connected by a rectangular thread pair, and the positioning shaft 13 is installed in the middle hole of the push rod 10; the guide key 14 is installed on the positioning shaft 13, and the guide key 14 and the keyway of the push rod 10 slide in a gapless manner; the inflatable expansion sleeve 9 is inserted into the positioning shaft 13 and the middle hole of the push rod 10, and locked with the positioning shaft 13; the right end of the inflatable expansion sleeve 9 has a thin-walled airbag; the module motor mounting support plate 2 and the module are installed at both ends of the module bottom plate 6 The support plate 20 has a module slide plate 7 installed in the middle; 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 of the lead screw 5 and the "U"-shaped groove of the bottom plate 6 is 0.01mm; the module servo motor 3 is installed on the module motor mounting support plate 2, and the motor rotating shaft is connected to the lead screw 5; the module slide plate 7 is installed in the slide groove of the module bottom plate 6, and is connected to the lead screw 5 through the lead screw transmission pair; the clamping tool 8 is installed on the module slide plate 7, and the part 22 is installed on the clamping tool 8;

[0007] The module bottom plate 6 is rectangular, with a parallelism of 0.01 mm between the upper and lower surfaces, a U-shaped cross section, a parallelism of 0.005 mm between the two sides of the "U", a perpendicularity of 0.005 mm to the bottom surface, and a surface roughness of Ra0.4 or above.

[0008] There is a mounting hole in the middle of each of the module motor mounting support plate 2 and the module support plate 20, with a coaxiality of 0.005 mm.

[0009] The middle of the lead screw 5 is an external lead screw thread, and both ends are cylinders, which respectively cooperate with the holes of the module motor mounting support plate 2 and the module support plate 20, with a clearance of 0.005mm; the straightness of the lead screw 5 is 0.01mm.

[0010] The module slide plate 7 is in a "convex" shape, and the two side surfaces of the convex part cooperate with the "U"-shaped groove of the module bottom plate 6, with a gap of 0.005mm; the step surface contacts the upper end surface of the module bottom plate 6, with a roughness of Ra0.4 or above; the module slide plate 7 has two vertically distributed holes, the lower hole is an internal screw threaded hole, which cooperates with the screw 5 with a coaxiality of 0.005mm.

[0011] The inflatable sleeve 9 is a split structure, consisting of a ventilation tube and an expansion rubber. The expansion rubber has an air bag and shrinks when not ventilated. It expands after ventilation. The right end is a cylindrical sleeve structure. The hole and the outer circle of the part 22 are matched with each other. The gap is 0.02-0.05mm and the wall thickness is 0.5mm. The ventilation tube is inserted into the expansion rubber and passed into the air bag, and then bonded and sealed.

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

[0013] The clearance between the hole in the push rod 10 and the outer circle of the positioning shaft 13 and the inflatable expansion sleeve 9 is no more than 0.01 mm.

[0014] The outer circle of the push rod 10 is connected to the rectangular threaded pair of the hole of the large gear 11, and the horizontal movement accuracy is 0.02mm / 100mm.

[0015] The large gear 11 and the small gear 19 are connected by a gear pair without meshing clearance.

[0016] The left end of the clamping fixture 8 can automatically expand to hold the component 22 tightly, and the right end is matched with the mounting hole of the module slide plate 7 without clearance.

[0017] The module slide plate 7 is connected to the lead screw 5 via a ball screw, and the horizontal movement accuracy is 0.02mm / 100mm.

[0018] The right end hole of the inflatable sleeve 9 is matched with the outer circle of the part 22, the gap is 0.02-0.05mm, and the wall thickness is 0.5mm.

[0019] The push rod 10 is made of a non-metallic material with high strength and high elasticity, and a keyway is provided in the middle hole.

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

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

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

[0023] Displacement sensor a4 and 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 inflation sleeve 9 should be smeared with grease;

[0025] A method for installing a sealing ring on a cylindrical part automatically: the sealing ring 23 is an elastic part, the inner diameter of which is smaller than the outer diameter of the sealing groove of the part 22, and the sealing ring 23 needs to be expanded to pass through the outer diameter of the sealing groove of the part 22, and then placed in the sealing groove of the part 22; before use, the numerical control program controls the module slide 7 and the push rod 10 to move to the coordinate origin; the inflatable expansion sleeve 9 matching the size of the sealing ring 23 is installed in the positioning shaft 13 and tightened; the air source 17 does not work, there is no pressurized gas in the device, and the inflatable expansion sleeve 9 is in a contracted state; four parts 22 are inserted into the outer circle of the contracted inflatable expansion sleeve 9, and the gas source 17 works at this time, and the pressurized gas is injected into the airbag of the inflatable expansion sleeve 9 through the air pipe 16 and the hole in the positioning shaft 13, so that the airbag expands; 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 of the parts 22 and the inflatable expansion sleeve 9 is not greater than φ0.01mm; the module servo motor 3 is controlled to rotate through the CNC program, the screw 5 is driven to rotate, and the module slide plate 7 is driven to move, through The displacement sensor a4 and the CNC program control the moving position of the part 22, and ensure that the part 22 stops when the left side of the sealing groove is flush with the left end of the inflatable expansion sleeve 9, starting from the first sealing groove on the far right; the gear servo motor 18 is controlled by the CNC program to drive the small gear 19 to rotate, and drives the large gear 11 to rotate, and drives the push rod 10 to move to the right through the thread pair. The orifice of the push rod 10 is 0.2 to 0.3 mm larger than the outer circle of the inflatable expansion sleeve 9, and can push the sealing ring 23 to move along the inflatable expansion sleeve 9 until it is pushed to 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 face 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, and the push rod 10 is driven to move to the right to push the second sealing ring into the second sealing groove; the above process is repeated according to the number of sealing rings to be installed; after the sealing ring is installed, the module slide 7 and the push rod 10 are controlled to move to the coordinate origin, and the part 22 is removed, and the installation is completed.

[0026] The advantages of the present invention are: the present invention expands the sealing ring by expanding the rubber expansion sleeve, and uses the automatic device of the present invention to push the sealing ring into the sealing groove, so as to realize the automatic assembly of O-rings of different sizes and quantities. The present invention has a simple structural design and convenient assembly operation; the device has high installation accuracy, stable structure and long service life; automatic assembly replaces manual assembly; the parts in contact with the sealing ring are made of non-metallic materials, which do not damage the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1It is a parts assembly diagram;

[0028] Figure 2 is a top view of the assembly device;

[0029] Figure 3 is the cross-sectional view AA of the assembly;

[0030] Figure 4 is the cross-sectional view BB of the assembly device;

[0031] Figure 5 is the assembly device cross-sectional view CC;

[0032] Figure 6 is a three-dimensional illustration of the assembly device;

[0033] Figure 7 It is an inflatable sleeve 9 shown in figure.

[0034] In the figure, 1-base plate, 2-module motor mounting support plate, 3-module servo motor, 4-displacement sensor a, 5-screw, 6-module base plate, 7-module slide plate, 8-clamping tooling, 9-inflatable expansion 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-parts, 23-sealing ring. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings. Figure 2 to Figure 5 .

[0036] A device for automatically installing a sealing ring on a cylindrical part, an assembly device for automatically installing the sealing ring into the annular sealing groove of the cylindrical part, characterized in that it includes: a bottom plate 1, a module motor mounting support plate 2, a module servo motor 3, a displacement sensor a4, a lead screw 5, a module bottom plate 6, a module slide plate 7, a clamping tool 8, an inflatable expansion 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 b21, and a sealing ring 23; the bottom plate 1 is rectangular, the air source 17 is installed on the left end, and the air source 17 is installed vertically to the right in sequence The mounting plate 15 and the support plate 12 are installed, and the right end is the module bottom plate 6; the gas source 17 can provide compressed gas with a pressure of more than 2 bar, which is connected to the positioning shaft 13 through the air pipe 16, and the pressurized gas is injected into the airbag of the inflatable sleeve 9 during operation; there are two mounting positions above the mounting plate 15, respectively installing the positioning shaft 13 and the displacement sensor 21, and the distance between the two and the bottom edge is consistent; the positioning shaft 13 and the mounting plate 15 hole are press-fitted and tightened; there are two mounting holes on the support plate 12, respectively installing the gear servo motor 18 and the large gear 11, and the vertical positions of the two are consistent; the mounting holes of the mounting plate 15 and the positioning shaft 13 are coaxial with the mounting holes of the large gear of the support plate 12 0.00 5mm; pinion 19 is installed on the rotating shaft of gear servo motor 18, pinion 19 and large gear 11 form a gear pair, meshing without gap; push rod 10 is installed in the hole of large gear 11, connected by rectangular thread pair, positioning shaft 13 is installed in the middle hole of push rod 10, sliding fit without gap; guide key 14 is installed on positioning shaft 13, guide key 14 and keyway of push rod 10 slide fit without gap; inflatable expansion sleeve 9 is inserted into the middle hole of positioning shaft 13 and push rod 10, and locked with positioning shaft 13; there is a thin-walled airbag at the right end of inflatable expansion sleeve 9, which shrinks when there is no air and expands when inflated. After expansion, the diameter of the hole at the right end is 0.02-0.05mm larger than the outer diameter of part 22, and the wall thickness is 0. 5mm, the hole depth is greater than the distance between the sealing ring installation position and the part end face; the module motor mounting support plate 2 and the module support plate 20 are installed at both ends of the module bottom plate 6, and the module slide plate 7 is installed in the middle; the two ends of the 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 of the screw 5 and the "U"-shaped groove of the bottom plate 6 is 0.01mm; the module servo motor 3 is installed on the module motor mounting support plate 2, and the motor rotating shaft is connected to the screw 5; the module slide plate 7 is installed in the slide groove of the module bottom plate 6, with no clearance sliding fit, and is connected to the screw 5 through the screw transmission pair; the clamping tool 8 is installed on the module slide plate 7, and the part 22 is installed on the clamping tool 8;

[0037] The module bottom plate 6 is rectangular, with a parallelism of 0.01 mm between the upper and lower surfaces, a U-shaped cross section, a parallelism of 0.005 mm between the two sides of the "U", a perpendicularity of 0.005 mm to the bottom surface, and a surface roughness of Ra0.4 or above.

[0038] The two ends of the module bottom plate 6 are respectively mounted with the module motor mounting support plate 2 and the module support plate 20, each having a mounting hole in the middle, with a coaxiality of 0.005 mm.

[0039] The middle of the lead screw 5 is an external lead screw thread, and both ends are cylinders, which respectively cooperate with the module motor mounting support plate 2 and the module support plate 20 holes, with a clearance of 0.005mm; the straightness of the lead screw 5 is 0.01mm.

[0040] The module slide plate 7 is in a "convex" shape, and the two side surfaces of the convex part cooperate with the "U"-shaped groove of the module bottom plate 6, with a gap of 0.005mm; the step surface contacts the upper end surface of the module bottom plate 6, with a roughness of Ra0.4 or above; the module slide plate 7 has two vertically distributed holes, the lower hole is an internal screw threaded hole, which cooperates with the screw 5 with a coaxiality of 0.005mm.

[0041] The inflatable sleeve 9 is a split structure, consisting of a ventilation tube and an expansion rubber. The expansion rubber has an airbag and shrinks when not ventilated. It expands after ventilation. The right end is a cylindrical sleeve structure. The hole and the outer circle of the part 22 are matched with each other. The gap is 0.02-0.05mm and the wall thickness is 0.5mm. The ventilation tube is inserted into the expansion rubber and passed into the airbag, and is bonded and sealed to ensure that the airbag cavity is connected to the outside world only through the ventilation port.

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

[0043] The clearance between the hole in the push rod 10 and the outer circle of the positioning shaft 13 and the inflatable expansion sleeve 9 is no more than 0.01 mm.

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

[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 fixture 8 can automatically expand to hold the component 22 tightly, and the right end is matched with the mounting hole of the module slide plate 7 without clearance.

[0047] The module slide plate 7 is connected to the lead screw 5 via a ball screw, and the horizontal movement accuracy is 0.02mm / 100mm.

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

[0049] The push rod 10 is made of a non-metallic material with high strength and high elasticity, and a keyway is provided in the middle hole.

[0050] The side surface of the guide key 14 has an interference fit with the groove of the positioning shaft 13, and has a clearance fit with the keyway of the push rod 10, the clearance is 0.005mm, and the parallelism with the central axis is 0.005mm.

[0051] The displacement sensor a4 feeds back the position of the module slide 7, and controls the position of the sealing groove of the part 22 through the numerical control program and the module servo motor 3.

[0052] The displacement sensor b21 feeds back the position of the push rod 10, and controls the position where the sealing ring 23 escapes through the numerical control program and the gear servo motor 18;

[0053] The device is automatically controlled and can realize the automatic assembly of different parts and sealing rings of different specifications; the assembly of sealing rings of different specifications requires the replacement of matching inflatable expansion sleeves 9; different positions require the preparation of different CNC programs;

[0054] The installation and disassembly of parts and the clamping of tools can be fully automated by industrial robots (manipulators); the installation of visual recognition systems can realize automatic detection of the installation process and results;

[0055] The large gear and the small gear are small module gears, with a module of 0.5;

[0056] Displacement sensor a4 and displacement sensor b21 are non-contact displacement sensors with a measurement accuracy of 0.05mm;

[0057] When in use, the outer cylindrical surface of the inflation sleeve 9 should be smeared with grease;

[0058] The principle is as follows: the sealing ring 23 is an elastic part, 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 placed in the sealing groove of the part 22; before use, the CNC program controls the module slide 7 and the push rod 10 to move to the coordinate origin (the right side is the coordinate origin of the module slide 7, and the left side is the coordinate origin of the push rod 10); the inflatable expansion sleeve 9 matching the size of the sealing ring 23 is installed in the positioning shaft 13 and tightened; the gas source 17 does not work, and there is no pressurized gas in the device , the inflatable expansion sleeve 9 is in a contracted state; the four parts 22 are inserted into the outer circle of the contracted inflatable expansion sleeve 9, and the gas source 17 works at this time, and the pressurized gas is injected into the airbag of the inflatable expansion sleeve 9 through the air pipe 16 and the hole in the positioning shaft 13, so that the airbag expands; 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 of the parts 22 and the inflatable expansion sleeve 9 is not greater than φ0.01mm; the module servo motor 3 is controlled to rotate through the CNC program, driving the screw 5 to rotate, driving the module slide plate 7 to move The displacement sensor a4 and the numerical control program are used to control the moving position of the part 22, and the part 22 stops when the left side of the sealing groove is flush with the left end of the inflatable expansion sleeve 9, starting from the first sealing groove on the far right; the gear servo motor 18 is controlled by the numerical control program to drive the small gear 19 to rotate, and drives the large gear 11 to rotate, and drives the push rod 10 to move to the right through the thread pair. The orifice of the push rod 10 is 0.2-0.3mm larger than the outer circle of the inflatable expansion sleeve 9, and the sealing ring 23 can be pushed to move along the inflatable expansion sleeve 9 until Push to the right end to make the sealing ring 23 fall into the sealing groove of 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, drive the push rod 10 to move to the right, and 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 7 and the push rod 10 to move to the coordinate origin, remove the part 22, and the installation is completed.

Claims

1. A device for automatically installing a sealing ring on a cylindrical part, characterized in that: The invention comprises a base plate (1), a module motor mounting support 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 tool (8), an inflatable expansion 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 at the left end of the base plate (1). (17), the mounting plate (15) and the support plate (12) are vertically installed in sequence to the right, and the right end is the module bottom plate (6); the gas source (17) is connected to the positioning shaft (13) through the air pipe (16), and the pressurized gas is injected into the airbag of the inflatable sleeve (9) during operation; there are two mounting positions above the mounting plate (15), respectively mounting the positioning shaft (13) and the displacement sensor b (21); the positioning shaft (13) and the mounting plate (15) hole are press-fitted and fastened; there are two mounting holes on the support plate (12), respectively mounting the gear servo motor (18) and the large gear (11), and the small gear (1 9) is installed on the rotating shaft of the gear servo motor (18); the push rod (10) is installed in the hole of the large gear (11), connected by a rectangular thread pair, and the positioning shaft (13) is installed in the middle hole of the push rod (10); the guide key (14) is installed on the positioning shaft (13), and the guide key (14) and the keyway of the push rod (10) are slidably matched without clearance; the inflatable expansion sleeve (9) is inserted into the middle hole of the positioning shaft (13) and the push rod (10), and is locked with the positioning shaft (13); the right end of the inflatable expansion sleeve (9) is provided with a thin-walled air bag; the module motor mounting support plate (2) and the module support plate (2) are installed at both ends of the module bottom plate (6). 0), a module slide plate (7) is installed in the middle; the two ends of the lead screw (5) are respectively installed in the installation holes of the module motor installation support plate (2) and the module support plate (20), and the parallelism of the lead screw (5) and the "U"-shaped groove of the module bottom plate (6) is 0.01mm; the module servo motor (3) is installed on the module motor installation support plate (2), and the motor rotating shaft is connected to the lead screw (5); the module slide plate (7) is installed in the slide groove of the module bottom plate (6), and is connected to the lead screw (5) through a lead screw transmission pair; a clamping tool (8) is installed on the module slide plate (7), and a part (22) is installed on the clamping tool (8).

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

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

4. The device for automatically installing a sealing ring on a cylindrical part according to claim 1, characterized in that: The middle of the lead screw (5) is an external lead screw thread, and both ends are cylindrical, respectively matching with the holes of the module motor mounting support 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 in a "convex" shape, and the two side surfaces of the convex part cooperate with the "U"-shaped groove of the module bottom plate (6) with a clearance of 0.005mm; the step surface contacts the upper end surface of the module bottom plate (6) with a roughness of Ra0.4 or above; the module slide plate (7) has two holes distributed vertically, and the lower hole is an internal screw thread hole, which cooperates with the screw (5) with a coaxiality of 0.005mm.

6. The device for automatically installing a sealing ring on a cylindrical part according to claim 1, characterized in that: The inflatable sleeve (9) is a split structure, consisting of a vent pipe and an expansion rubber. The expansion rubber has an air bag and contracts when not ventilated. It expands after ventilation. The right end is a cylindrical sleeve structure. The hole and the outer circle of the part (22) are matched with each other. The gap is 0.02-0.05mm and the wall thickness is 0.5mm. The vent pipe is inserted into the expansion rubber and passed into the air bag, and then bonded and 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 tool (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 circle of the positioning shaft (13) and the inflatable expansion sleeve (9) is no 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 to the rectangular threaded pair of the hole of the large gear (11), and the horizontal movement accuracy is 0.02mm / 100mm.

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 without 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 tool (8) automatically expands to hold the part (22) tight, and the right end fits with the mounting hole of the module slide plate (7) without clearance.

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) is connected to the lead screw (5) via a ball screw, and the horizontal movement accuracy is 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 right end hole of the inflatable sleeve (9) is clearance-matched with the outer circle of the part (22), the clearance is 0.02-0.05 mm, and the wall thickness is 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 its 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) is interference fit with the groove of the positioning shaft (13), and is clearance fit with the key groove of the push rod (10), the clearance is 0.005mm, and the parallelism with the central axis is 0.005mm.

16. The device for automatically installing a sealing ring on a cylindrical part according to claim 1, characterized in that: The displacement sensor a4 feeds back 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) feeds back the position of the push rod (10), and controls the position where the sealing ring (23) comes out through a numerical control program and a gear servo motor (18).

18. The device for automatically installing a sealing ring on a cylindrical part according to claim 1, characterized in that: Displacement sensor a4 and 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: The device as described in any one of claims 1 to 18 is used, wherein 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 placed in the sealing groove of the part (22); before use, the CNC program controls the module slide (7) and the push rod (10) to move to the coordinate origin; the inflatable expansion sleeve (9) matching the size of the sealing ring (23) is installed in 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 Contracted state; four parts (22) are inserted into the outer circle of the contracted inflatable expansion sleeve (9), and the gas source (17) works at this time, and the pressurized gas is injected into the airbag of the inflatable expansion sleeve (9) through the air pipe (16) and the hole of the positioning shaft (13), so that the airbag expands; the parts (22) are mounted on the clamping tool (8), and the clamping tool (8) is mounted on the support plate 7 to ensure that the coaxiality of the parts (22) and the inflatable expansion sleeve (9) is not greater than φ0.01mm; the module servo motor (3) is controlled to rotate through the CNC program, driving the screw (5) to rotate, driving the module slide plate (7) to move , through the displacement sensor a4 and the numerical control program, the moving position of the part (22) is controlled to ensure that the left side of the sealing groove of the part (22) is flush with the left end of the inflatable expansion sleeve (9) and stops, starting from the first sealing groove on the far right; through the numerical control program, the gear servo motor (18) drives the small gear (19) to rotate, and drives the large gear (11) to rotate, and drives the push rod (10) to move to the right through the thread pair. The orifice of the push rod (10) is 0.2 to 0.3 mm larger than the outer circle of the inflatable expansion sleeve (9), and can push the sealing ring (23) to move along the inflatable expansion sleeve (9) until Push to the right end, so that the sealing ring (23) falls 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 surface of the inflation sleeve (9) is flush with the left end of the second sealing groove; control the gear servo motor (18) to rotate, drive the push rod (10) to move to the right, and 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 the push rod (10) to move to the coordinate origin, remove the part (22), and the installation is completed.

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