An assembly device for a valve core and an O-ring

Abstract

The present invention provides an assembly device for a valve core and an O-ring, which comprises a frame. A first feeding mechanism, a second feeding mechanism, a moving mechanism, an expanding mechanism and a sleeving mechanism are installed on the frame. The moving mechanism includes a first material taking shaft and a first driving part. The first material taking shaft is connected to the output end of the first driving part. The first driving part drives the first material taking shaft to move vertically and horizontally. The expanding mechanism is used for expanding the O-ring to enlarge the inner hole of the O-ring. The expanding mechanism is located on the moving path of the output end of the first driving part. The sleeving mechanism includes a second material taking shaft and a pushing part. Both the second material taking shaft and the pushing part are connected to the output end of the first driving part. The second material taking shaft takes out the expanded O-ring from the expanding mechanism through the movement of the output end of the first driving part. The pushing part is used for pushing out the O-ring in the annular groove and sleeving it onto the valve core. The above-mentioned device operates automatically, improves the assembly efficiency and quality, and reduces the labor intensity of workers.

Description

Technical Field

[0001] The present invention relates to the technical field of automated assembly, and more particularly, to an assembly device for a valve core and an O-ring. Background Art

[0002] A solenoid valve is a device that controls the flow of fluid using electromagnetic principles. It typically consists of an electromagnetic actuator and a valve body, and controls the opening and closing of the valve body through the action of electromagnetic force to achieve the control of fluid. The working principle of a solenoid valve is to use the magnetic field generated by an electromagnetic coil to control the movement of the valve core. When powered on, the electromagnetic coil generates a magnetic field, causing the valve core to be subjected to magnetic force and separate from the valve seat, allowing the fluid to pass through; when powered off, the magnetic field disappears, and the valve core returns to its original position due to the action of forces such as springs, the valve seat closes, and the fluid stops passing through. Solenoid valves are widely used in various industrial fields and equipment to control the flow rate, pressure, and direction of liquids or gases. They play an important role in automated systems, water supply systems, HVAC systems, metallurgy, chemical industry, food processing, and other industries. The valve core of a solenoid valve is commonly used to seal the liquid or gas medium inside the solenoid valve to ensure the normal operation of the solenoid valve and prevent leakage. An O-ring is a ring-shaped rubber seal with excellent elasticity and chemical corrosion resistance, and is commonly used for the seal of the valve core. Currently, the O-rings on the valve core are generally installed manually by workers one by one, which seriously affects the installation efficiency and quality. Summary of the Invention

[0003] The main object of the present invention is to provide an assembly device for a valve core and an O-ring, including but not limited to solving the technical problems of low installation efficiency and quality in the prior art.

[0004] To solve the above technical problems, the technical solution adopted by the present invention is as follows: An assembly device for a valve core and an O-ring, comprising a frame, on which a first feeding mechanism for supplying valve cores and a second feeding mechanism for supplying O-rings are installed. A moving mechanism, an expanding mechanism and a sleeving mechanism are also installed on the frame; the moving mechanism is arranged between the first feeding mechanism and the second feeding mechanism, and the moving mechanism includes a first picking shaft and a first driving part. The outer diameter of the first picking shaft is larger than the inner hole diameter of the O-ring. The first picking shaft is connected to the output end of the first driving part, and the first driving part is installed on the frame. The first driving part drives the first picking shaft to move vertically and horizontally; the expanding mechanism is arranged between the first feeding mechanism and the second feeding mechanism, and the expanding mechanism is used to expand the O-ring to enlarge the inner hole of the O-ring. The expanding mechanism is located on the moving path of the output end of the first driving part; the sleeving mechanism includes a second picking shaft and a pushing part. Both the second picking shaft and the pushing part are connected to the output end of the first driving part. A ring groove for the O-ring to be embedded is provided on the outer wall of the second picking shaft. The depth of the ring groove is less than the cross-sectional diameter of the O-ring. The second picking shaft takes out the expanded O-ring from the expanding mechanism through the movement of the output end of the first driving part, and the pushing part is used to push out the O-ring in the ring groove and sleeve it onto the valve core.

[0005] The beneficial effects of the present invention are as follows: By setting the first picking shaft and the first driving part, the O-ring is effectively moved from the second feeding mechanism to the expanding mechanism. The expanding mechanism enlarges the inner hole diameter of the O-ring, replacing manual expansion of the O-ring and avoiding damage to the O-ring. By setting the second picking shaft and the pushing part, the ring groove on the second picking shaft can maintain the expanded state of the O-ring, and driven by the pushing part, the expanded O-ring is effectively sleeved onto the valve core. The entire installation process is automated, greatly improving the assembly efficiency and quality of the valve core and the O-ring, and reducing the labor intensity of workers.

[0006] Preferably, the expanding mechanism includes a base, on which a positioning hole for positioning the O-ring is provided. The positioning hole is for the first picking shaft to insert. A plurality of chucks are installed on the base. The plurality of chucks are circumferentially distributed outside the positioning hole for clamping the O-ring. A second driving part for driving the plurality of chucks to approach or move away from the positioning hole is also installed on the base. By adopting the above structure, the O-ring is effectively expanded. By setting the positioning hole, the O-ring can be accurately positioned, improving the accuracy of the expansion action.

[0007] Preferably, the chuck includes a first clamping block and a second clamping block. The middle part of the second clamping block is hinged to the first clamping block through a pin shaft. The O-ring is clamped between the upper end of the second clamping block and the first clamping block. When the lower end of the second clamping block opens outwards, the second clamping block rotates around the pin shaft, reducing the distance between the upper end of the second clamping block and the first clamping block to clamp the O-ring. By adopting the above structure, stable clamping of the O-ring is achieved, and the stability of the expansion action is improved.

[0008] Preferably, the second driving part includes a roller, a slider and a downward pulling cylinder. The cylinder body of the downward pulling cylinder is fixedly connected to the base. The piston rod of the downward pulling cylinder is fixedly connected to the slider. The slider is slidably arranged on the base in the vertical direction. The roller is rotatably connected to the slider. A groove for cooperating with the roller is provided at the lower end of the second clamping block. The lower groove wall of the groove is inclined from top to bottom towards the central axis of the base. When the piston rod of the downward pulling cylinder moves downwards, the slider drives the roller to move downwards. The roller rolls on the lower groove wall of the groove, causing the lower end of the second clamping block to open outwards. The first clamping block is movably connected to the base along the radial direction of the positioning hole. When the roller continues to move downwards, the second clamping block drives the first clamping block to move away from the positioning hole. By adopting the above structure, the lower end of the second clamping block is opened outwards, and the first clamping block is driven to move away from the positioning hole. The structure connection is stable, the operation is reliable, and the reliability of the expansion action is improved.

[0009] Preferably, the second driving part further includes a return spring. One end of the return spring is connected to the base, and the other end of the return spring is connected to the first clamping block, so as to make the first clamping block move towards the positioning hole. By adopting the above structure, the chuck moves towards the positioning hole, which is convenient for the chuck to quickly reset and is beneficial to the expansion operation of the next O-ring.

[0010] Preferably, the pushing part includes a sleeve and a pushing cylinder. The sleeve is slidably sleeved on the second material taking shaft. The sleeve is fixedly connected to the piston rod of the pushing cylinder. The cylinder body of the pushing cylinder is fixedly installed at the output end of the first driving part. By adopting the above structure, effective pushing of the pushing part is achieved, and the sleeving stability of the O-ring is improved.

[0011] Preferably, the first feeding mechanism includes a first vibrating disk, a first feeding track and a reversing device. The first vibrating disk is fixedly installed on the frame. The valve core is placed in the first vibrating disk. The first feeding track is connected to the first vibrating disk to enable the valve core to be discharged in an orderly arrangement. The reversing device is located at the discharge end of the first feeding track. The reversing device is used to turn the valve core to match the sleeving direction of the O-ring. By adopting the above structure, effective feeding of the valve core is achieved, and the reversing device is set to improve the sleeving efficiency.

[0012] Preferably, the commutation device includes a pneumatic chuck, a rotary cylinder, and a lifting part. The pneumatic chuck is used to clamp the end of the valve core. The pneumatic chuck is connected to the rotating shaft of the rotary cylinder. The cylinder body of the rotary cylinder is connected to the output end of the lifting part. The lifting part is installed on the frame for height adjustment. By adopting the above structure, reliable commutation of the valve core is achieved, and the stability of commutation is improved.

[0013] Preferably, a clamping device for clamping the valve core one by one is provided between the first feeding track and the commutation device. The clamping device includes a vertical frame, a moving cylinder, a clamping cylinder, and clamping jaws. The clamping jaws are connected to the output end of the clamping cylinder. The cylinder body of the clamping cylinder is connected to the output end of the moving cylinder. The moving cylinder is installed on the vertical frame, and the vertical frame is installed on the frame. The moving cylinder is used to move the valve core towards the commutation device. By adopting the above structure, when the valve core on the commutation device is sleeved with an O-ring, the clamping device can still feed the material stably, improving the feeding efficiency of the valve core.

[0014] Preferably, the clamping device further includes a limiting swing rod. The limiting swing rod is L-shaped. The bent part of the limiting swing rod is hinged to the output end of the moving cylinder through a rotating shaft. The long rod of the limiting swing rod is used for limiting and abutting the valve core. The short rod of the limiting swing rod is connected with a third driving part for making the limiting swing rod rotate around the rotating shaft. The third driving part includes a resisting plate fixed on the vertical frame. The resisting plate is provided with a first contact surface and a second contact surface for the short rod to abut against. The first contact surface and the second contact surface are transitioned by an arc surface. When the short rod abuts against the first contact surface, the long rod abuts against the valve core. When the short rod abuts against the second contact surface, the long rod moves away from the valve core. By adopting the above structure, the valve core is effectively limited, avoiding the valve core falling off from the clamping device. At the same time, after the long rod moves away from the valve core, it is convenient for the pneumatic chuck to grab the valve core. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of an assembly device for a valve core and an O-ring of the present invention;

[0016] Figure 2 is a schematic structural diagram of the first feeding mechanism;

[0017] Figure 3 is a schematic structural diagram of the commutation device;

[0018] Figure 4 is a schematic structural diagram of the clamping device;

[0019] Figure 5 is a schematic structural diagram of the second feeding mechanism;

[0020] Figure 6 is a schematic structural diagram of the moving mechanism;

[0021] Figure 7 It is a structural schematic diagram of the set mechanism;

[0022] Figure 8 It is a partial structural schematic diagram of the expansion mechanism Figure 1 ;

[0023] Figure 9 It is a partial structural schematic diagram of the expansion mechanism Figure 2 ;

[0024] Figure 10 It is the use state of the expansion mechanism Figure 1 ;

[0025] Figure 11 It is the use state of the expansion mechanism Figure 2 ;

[0026] Figure 12 It is the use state of the expansion mechanism Figure 3 ;

[0027] Explanation of reference numerals:

[0028] 1. Frame; 2. First feeding mechanism; 21. First vibrating bowl; 22. First feeding track; 23. Reversing device; 231. Pneumatic jaw chuck; 232. Rotary cylinder; 233. Lifting part; 24. Gripping device; 241. Vertical frame; 242. Moving cylinder; 243. Gripping cylinder; 244. Jaw; 245. Limit swing rod; 246. Rotating shaft; 247. Bracing plate; 2471. First contact surface; 2472. Second contact surface; 2473. Arc surface; 3. Second feeding mechanism; 31. Second vibrating bowl; 32. Second feeding track; 321. Limit baffle; 322. Avoidance hole; 4. Moving mechanism; 41. First picking shaft; 42. First driving part; 421. Bracket; 422. Transverse sliding cylinder; 423. Vertical sliding cylinder; 424. Slide block; 5. Expansion mechanism; 51. Base; 511. Positioning hole; 52. Chuck; 521. First clamping block; 522. Second clamping block; 5221. Groove; 523. Pin shaft; 53. Second driving part; 531. Roller; 532. Slide block; 533. Pull-down cylinder; 534. Return spring; 6. Set mechanism; 61. Second picking shaft; 611. Ring groove; 62. Pushing part; 621. Sleeve; 622. Pushing cylinder; 10. Spool; 20. O-ring. Detailed implementation manners

[0029] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description will be given to the specific embodiments of the present invention with reference to the accompanying drawings.

[0030] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0031] As Figures 1 to 12 shown, this embodiment provides an assembly device for a valve core and an O-ring, including a frame 1. A first feeding mechanism 2 for supplying the valve core 10, a second feeding mechanism 3 for supplying the O-ring 20, a moving mechanism 4 for moving the O-ring 20, an expanding mechanism 5 for expanding the O-ring 20, and a sleeving mechanism 6 are installed on the frame 1.

[0032] In this embodiment, the moving mechanism 4 is arranged between the first feeding mechanism 2 and the second feeding mechanism 3. The moving mechanism 4 includes a first picking shaft 41 and a first driving part 42. The outer diameter of the first picking shaft 41 is larger than the inner hole diameter of the O-ring 20. The first picking shaft 41 is connected to the output end of the first driving part 42. The first driving part 42 is installed on the frame 1. The first driving part 42 drives the first picking shaft 41 to move vertically and horizontally. Specifically, the first driving part 42 includes a bracket 421, a horizontal sliding cylinder 422, a vertical sliding cylinder 423, and a sliding seat 424. The bracket 421 is fixedly installed on the frame 1. The fixed part of the horizontal sliding cylinder 422 is connected to the bracket 421. The moving part of the horizontal sliding cylinder 422 is connected to the fixed part of the vertical sliding cylinder 423. The moving part of the vertical sliding cylinder 423 is connected to the sliding seat 424. The sliding seat 424 is connected to the first picking shaft 41.

[0033] In this embodiment, the expansion mechanism 5 is disposed between the first feeding mechanism 2 and the second feeding mechanism 3. The expansion mechanism 5 is configured to expand the O-ring 20 to enlarge the inner hole of the O-ring 20, and the expansion mechanism 5 is located on the moving path of the slide block 424. Specifically, the expansion mechanism 5 includes a base 51. A positioning hole 511 for positioning the O-ring 20 is provided on the base 51. The first material taking shaft 41 is inserted into the positioning hole 511. Four sets of chucks 52 are mounted on the base 51. The four sets of chucks 52 are evenly distributed circumferentially outside the positioning hole 511 for clamping the O-ring 20. A second driving part 53 for driving the multiple sets of chucks 52 to approach or move away from the positioning hole 511 is further mounted on the base 51. The chuck 52 includes a first clamping block 521 and a second clamping block 522. The middle of the second clamping block 522 is hinged to the first clamping block 521 through a pin shaft 523. The O-ring 20 is clamped between the upper end of the second clamping block 522 and the first clamping block 521. When the lower end of the second clamping block 522 opens outwards, the second clamping block 522 rotates around the pin shaft 523, so that the distance between the upper end of the second clamping block 522 and the first clamping block 521 decreases to clamp the O-ring 20. The second driving part 53 includes a roller 531, a slider 532 and a downward pulling air cylinder 533. The cylinder body of the downward pulling air cylinder 533 is fixedly connected to the base 51. The piston rod of the downward pulling air cylinder 533 is fixedly connected to the slider 532. The slider 532 is slidably arranged vertically on the base 51. The roller 531 is rotatably connected to the slider 532. A groove 5221 for cooperating with the roller 531 is provided at the lower end of the second clamping block 522. The lower groove wall of the groove 5221 is inclined towards the central axis of the base 51 from top to bottom. When the piston rod of the downward pulling air cylinder 533 moves downwards, the slider 532 drives the roller 531 to move downwards. The roller 531 rolls on the lower groove wall of the groove 5221, so that the lower end of the second clamping block 522 opens outwards. The first clamping block 521 is movably connected to the base 51 along the radial direction of the positioning hole 511. When the roller 531 continues to move downwards, the second clamping block 522 drives the first clamping block 521 to move away from the positioning hole 511. The second driving part 53 further includes a return spring 534. One end of the return spring 534 is connected to the base 51, and the other end of the return spring 534 is connected to the first clamping block 521 for moving the first clamping block 521 towards the positioning hole 511.

[0034] In this embodiment, the set mechanism 6 includes a second material taking shaft 61 and a pushing part 62. The second material taking shaft 61 and the pushing part 62 are both connected to the sliding seat 424. An annular groove 611 for embedding the O-ring 20 is provided on the outer wall of the second material taking shaft 61. The depth of the annular groove 611 is less than the cross-sectional diameter of the O-ring 20. The second material taking shaft 61 takes out the expanded O-ring 20 from the expansion mechanism 5 through the movement of the output end of the first driving part 42. The pushing part 62 is used to push out the O-ring 20 in the annular groove 611 and sleeved it onto the valve core 10. Specifically, the pushing part 62 includes a sleeve 621 and a pushing cylinder 622. The sleeve 621 is slidably sleeved on the second material taking shaft 61. The sleeve 621 is fixedly connected to the piston rod of the pushing cylinder 622. The cylinder body of the pushing cylinder 622 is fixedly installed on the sliding seat 424.

[0035] In this embodiment, the first feeding mechanism 2 includes a first vibrating disk 21, a first feeding track 22 and a commutation device 23. The first vibrating disk 21 is fixedly installed on the frame 1. The valve core 10 is placed in the first vibrating disk 21. The first feeding track 22 is connected to the first vibrating disk 21 to enable the valve core 10 to be discharged in an orderly manner. The commutation device 23 is located at the discharge end of the first feeding track 22. The commutation device 23 is used to change the direction of the valve core 10 for matching the sleeving direction of the O-ring 20. Specifically, the commutation device 23 includes a pneumatic claw chuck 231, a rotary cylinder 232 and a lifting part 233. The pneumatic claw chuck 231 is used to clamp the end of the valve core 10. The pneumatic claw chuck 231 is connected to the rotating shaft of the rotary cylinder 232. The cylinder body of the rotary cylinder 232 is connected to the output end of the lifting part 233. The lifting part 233 is installed on the frame 1 for adjusting the height. The lifting part 233 includes a lead screw, a lifting column, a guide frame and a motor.

[0036] In this embodiment, a clamping device 24 for clamping the valve core 10 one by one is provided between the first feeding track 22 and the reversing device 23. The clamping device 24 includes a vertical frame 241, a moving cylinder 242, a clamping cylinder 243 and clamping jaws 244. The clamping jaws 244 are connected to the output end of the clamping cylinder 243. The cylinder body of the clamping cylinder 243 is connected to the output end of the moving cylinder 242. The moving cylinder 242 is installed on the vertical frame 241, and the vertical frame 241 is installed on the machine frame 1. The moving cylinder 242 is used to move the valve core 10 towards the reversing device 23. The clamping device 24 further includes a limiting swing rod 245. The limiting swing rod 245 is L-shaped. The bent portion of the limiting swing rod 245 is hinged to the output end of the moving cylinder 242 through a rotating shaft 246. The long rod of the limiting swing rod 245 is used for limiting and abutting against the valve core 10. The short rod of the limiting swing rod 245 is connected with a third driving part for making the limiting swing rod 245 rotate around the rotating shaft 246. The third driving part includes a resisting plate 247 fixed on the vertical frame 241. The resisting plate 247 is provided with a first contact surface 2471 and a second contact surface 2472 for the short rod to abut against. The first contact surface 2471 and the second contact surface 2472 are transitioned through an arc surface 2473. When the short rod abuts against the first contact surface 2471, the long rod abuts against the valve core 10. When the short rod abuts against the second contact surface 2472, the long rod is away from the valve core 10.

[0037] In this embodiment, the second feeding mechanism 3 includes a second vibrating disk 31 and a second feeding track 32. The second vibrating disk 31 is fixedly installed on the machine frame 1. The O-ring 20 is placed in the second vibrating disk 31. The second feeding track 32 is connected with the second vibrating disk 31 to enable the O-ring 20 to be discharged in an orderly manner. The discharging end of the second feeding track 32 is provided with a limiting baffle 321 and an avoidance hole 322. The limiting baffle 321 is used to prevent the O-ring 20 from escaping from the discharging end of the second feeding track 32. The avoidance hole 322 is used to avoid the first picking shaft 41 and facilitate the first picking shaft 41 to insert into the inner hole of the O-ring 20.

[0038] Assembly process of the valve core and the O-ring: The O-ring 20 is moved to the discharge end of the second feeding track 32 through the second vibrating bowl 31. The first driving part 42 drives the first material taking shaft 41 to sleeved the O-ring 20 on the first material taking shaft 41. Then the first driving part 42 moves the O-ring 20 to the positioning hole 511 of the base 51. The second driving part 53 drives a plurality of chucks 52 to operate to expand the inner hole of the O-ring 20. Then the second material taking shaft 61 takes out the expanded O-ring 20 from the expansion mechanism 5 through the movement of the sliding seat 424. At the same time, the valve core 10 is moved to the discharge end of the first feeding track 22 through the first vibrating bowl 21. The clamping device 24 clamps the valve core 10 and sends it to the commutation device 23. The commutation device 23 commutes the valve core 10 so that the valve core 10 is arranged vertically to match the sleeving direction of the O-ring 20. Finally, through the operation of the pushing cylinder 622, the sleeve 621 pushes out the O-ring 20 and sleeved it on the valve core 10, thus realizing automatic assembly and improving the assembly efficiency and quality.

[0039] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will all fall within the protection scope of the present invention.

Claims

1. An assembly device for a valve core and an O-ring, comprising a frame (1), wherein a first feeding mechanism (2) for supplying the valve core (10) and a second feeding mechanism (3) for supplying the O-ring (20) are installed on the frame (1), and it is characterized in that, A moving mechanism (4), an expanding mechanism (5) and a sleeving mechanism (6) are also installed on the frame (1); The moving mechanism (4) is arranged between the first feeding mechanism (2) and the second feeding mechanism (3). The moving mechanism (4) includes a first material taking shaft (41) and a first driving part (42). The outer diameter of the first material taking shaft (41) is larger than the inner hole diameter of the O-ring (20). The first material taking shaft (41) is connected to the output end of the first driving part (42). The first driving part (42) is installed on the frame (1). The first driving part (42) drives the first material taking shaft (41) to move vertically and horizontally; The expanding mechanism (5) is arranged between the first feeding mechanism (2) and the second feeding mechanism (3). The expanding mechanism (5) is used to expand the O-ring (20) so as to enlarge the inner hole of the O-ring (20). The expanding mechanism (5) is located on the moving path of the output end of the first driving part (42); The sleeving mechanism (6) includes a second material taking shaft (61) and a pushing part (62). The second material taking shaft (61) and the pushing part (62) are both connected to the output end of the first driving part (42). A ring groove (611) for the O-ring (20) to be embedded is arranged on the outer wall of the second material taking shaft (61). The depth of the ring groove (611) is less than the cross-sectional diameter of the O-ring (20). The second material taking shaft (61) takes out the expanded O-ring (20) from the expanding mechanism (5) through the movement of the output end of the first driving part (42). The pushing part (62) is used to push out the O-ring (20) in the ring groove (611) and sleeved onto the valve core (10); The pushing part (62) includes a sleeve (621) and a pushing cylinder (622). The sleeve (621) is slidably sleeved on the second material taking shaft (61). The sleeve (621) is fixedly connected to the piston rod of the pushing cylinder (622). The cylinder body of the pushing cylinder (622) is fixedly installed on the output end of the first driving part (42); The first feeding mechanism (2) includes a first vibrating bowl (21), a first feeding track (22) and a reversing device (23). The first vibrating bowl (21) is fixedly installed on the frame (1). The valve core (10) is placed in the first vibrating bowl (21). The first feeding track (22) is connected to the first vibrating bowl (21) to enable the valve core (10) to be discharged in an orderly manner. The reversing device (23) is located at the discharging end of the first feeding track (22). The reversing device (23) is used to turn the valve core (10) to match the sleeving direction of the O-ring (20); The reversing device (23) includes a pneumatic chuck (231), a rotary cylinder (232) and a lifting part (233). The pneumatic chuck (231) is used to clamp the end of the valve core (10). The pneumatic chuck (231) is connected to the rotating shaft of the rotary cylinder (232). The cylinder body of the rotary cylinder (232) is connected to the output end of the lifting part (233). The lifting part (233) is installed on the frame (1) for height adjustment.

2. The assembling device for a valve core and an O-ring according to claim 1, characterized in that, The expansion mechanism (5) includes a base (51). A positioning hole (511) for positioning the O-ring (20) is provided on the base (51). The positioning hole (511) is for the first material taking shaft (41) to be inserted. A plurality of groups of chucks (52) are installed on the base (51). The plurality of groups of chucks (52) are circumferentially distributed outside the positioning hole (511) for clamping the O-ring (20). A second driving part (53) for driving the plurality of groups of chucks (52) to approach or move away from the positioning hole (511) is also installed on the base (51).

3. The assembly device for a valve core and an O-ring according to claim 2, characterized in that, The chuck (52) includes a first clamping block (521) and a second clamping block (522). The middle part of the second clamping block (522) is hinged to the first clamping block (521) through a pin shaft (523). The O-ring (20) is clamped between the upper end of the second clamping block (522) and the first clamping block (521). When the lower end of the second clamping block (522) opens outwards, the second clamping block (522) rotates around the pin shaft (523), so that the distance between the upper end of the second clamping block (522) and the first clamping block (521) decreases to clamp the O-ring (20).

4. The assembling device for a valve core and an O-ring according to claim 3, characterized in that, The second driving part (53) includes a roller (531), a slider (532) and a downward pulling air cylinder (533). The cylinder body of the downward pulling air cylinder (533) is fixedly connected to the base (51). The piston rod of the downward pulling air cylinder (533) is fixedly connected to the slider (532). The slider (532) is slidably arranged vertically on the base (51). The roller (531) is rotatably connected to the slider (532). A groove (5221) for cooperating with the roller (531) is provided at the lower end of the second clamping block (522). The lower groove wall of the groove (5221) is inclined from top to bottom towards the central axis of the base (51). When the piston rod of the downward pulling air cylinder (533) moves downwards, the slider (532) drives the roller (531) to move downwards. The roller (531) rolls on the lower groove wall of the groove (5221), so that the lower end of the second clamping block (522) opens outwards. The first clamping block (521) is movably connected to the base (51) along the radial direction of the positioning hole (511). When the roller (531) continues to move downwards, the second clamping block (522) drives the first clamping block (521) to move away from the positioning hole (511).

5. The assembling device for a valve core and an O-ring according to claim 4, characterized in that, The second driving part (53) further includes a return spring (534). One end of the return spring (534) is connected to the base (51), and the other end of the return spring (534) is connected to the first clamping block (521) for moving the first clamping block (521) towards the positioning hole (511).

6. The assembling device for a valve core and an O-ring according to claim 1, characterized in that, A clamping device (24) for individually clamping the valve core (10) is provided between the first feeding track (22) and the reversing device (23). The clamping device (24) includes a vertical frame (241), a moving cylinder (242), a clamping cylinder (243), and clamping jaws (244). The clamping jaws (244) are connected to the output end of the clamping cylinder (243). The cylinder body of the clamping cylinder (243) is connected to the output end of the moving cylinder (242). The moving cylinder (242) is mounted on the vertical frame (241). The vertical frame (241) is mounted on the machine frame (1). The moving cylinder (242) is used to move the valve core (10) towards the reversing device (23).

7. An assembling device for a valve core and an O-ring according to claim 6, characterized in that, The clamping device (24) further includes a limiting swing rod (245). The limiting swing rod (245) is L-shaped. The bent portion of the limiting swing rod (245) is hinged to the output end of the moving cylinder (242) through a rotating shaft (246). The long rod of the limiting swing rod (245) is used for limiting and abutting against the valve core (10). A third driving part for enabling the limiting swing rod (245) to rotate around the rotating shaft (246) is connected to the short rod of the limiting swing rod (245). The third driving part includes a resisting plate (247) fixed on the vertical frame (241). A first contact surface (2471) and a second contact surface (2472) for the short rod to abut against are provided on the resisting plate (247). The first contact surface (2471) and the second contact surface (2472) are transitioned through an arc surface (2473). When the short rod abuts against the first contact surface (2471), the long rod abuts against the valve core (10). When the short rod abuts against the second contact surface (2472), the long rod is away from the valve core (10).

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