An expansion assembly device for a sealing ring

Abstract

The present invention relates to the technical field of sealing ring expansion, and specifically to an expansion and assembly device for sealing rings, comprising a workbench, on which an expansion mechanism for automatically expanding an O-ring is arranged, and the expansion mechanism comprises a fixed table installed on the workbench, on which a plurality of sliding seats are slidably arranged, a rotating member is rotatably arranged at one end of the sliding seat, a rotating seat for assisting the sliding of the plurality of sliding seats is rotatably arranged on the fixed table, and one end of the rotating member is rotatably connected to the rotating seat. The purpose of the present invention is to provide an expansion and assembly device for sealing rings, wherein an expansion block can be used to position one side of the O-ring, and each side of the O-ring can be installed in sequence, so as to improve the assembly accuracy of the O-ring on the one hand, and give the staff modification time when assembling the O-ring on the other hand, thereby improving the fault tolerance of the O-ring assembly, and improving the assembly efficiency and quality of the O-ring.

Description

Technical Field

[0001] The invention relates to the technical field of sealing ring expansion, in particular to an expansion assembly device for a sealing ring. Background Art

[0002] In the current connector industry, it is difficult to assemble the O-ring for the positioning part. When assembling the O-ring into the corresponding groove of the connector, the O-ring needs to be expanded manually. Since the grooves corresponding to the O-ring and the connector are small in size, it is difficult to assemble manually, which makes it difficult for operators to assemble the O-ring on the connector and the processing efficiency is low. Therefore, there are machines that automatically expand and assemble the O-ring on the market.

[0003] However, the current expansion robot only expands the O-ring, then places the mounting part in a certain position, the expansion robot cancels the expansion of the O-ring, and then shrinks it on the mounting part. However, in the process of the expansion robot canceling the expansion of the O-ring, all edges of the O-ring will contact the mounting part at the same time. Once the O-ring shifts in the process of canceling contact with the expansion robot, the O-ring will not be able to shrink correctly into the ring groove on the mounting part, so that the O-ring shrinks to other positions of the mounting part, making it difficult to remove, thereby affecting assembly efficiency. Summary of the invention

[0004] The object of the present invention is to provide an expansion assembly device for a sealing ring, which can use an expansion block to position one side of the O-ring and install each side of the O-ring in sequence, on the one hand, improving the accuracy of the assembly of the O-ring, and on the other hand, giving the staff time to modify when assembling the O-ring, thereby improving the fault tolerance of the O-ring assembly and improving the assembly efficiency and quality of the O-ring.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an expansion assembly device for a sealing ring, comprising a workbench, wherein an expansion mechanism for automatically expanding an O-ring is arranged on the workbench, wherein the expansion mechanism comprises a fixed table installed on the workbench, wherein multiple groups of sliding seats are slidably arranged on the fixed table, a rotating member is rotatably arranged at one end of the sliding seat, and a rotating seat for assisting the sliding of multiple groups of sliding seats is rotatably arranged on the fixed table, wherein one end of the rotating member is rotatably connected to the rotating seat, and one end of the sliding seat passes through the fixed table and the workbench and is installed with a first expansion plate, a second hydraulic rod is arranged on one side of the first expansion plate, and a second expansion plate is arranged on the second hydraulic rod, wherein during the sliding of one of the sliding seats on the fixed table, the sliding seat drives the rotating seat to rotate on the fixed table by using the rotating member, and then the fixed table drives the other multiple groups of sliding seats to slide by using the multiple groups of rotating members, thereby causing the first expansion plates on the multiple groups of sliding seats to move synchronously on the workbench, and the multiple groups of the first expansion plates simultaneously drive the second expansion plates to move to squeeze multiple positions of the O-ring so as to automatically expand and contract, and at the same time, the second expansion plates are driven by the multiple groups of the second hydraulic rods The movement can change the extrusion state of multiple positions of the O-ring; the fixed table is provided with a positioning mechanism for assisting the positioning of the O-ring, the positioning mechanism includes a fixed cylinder fixed on the workbench, a main shaft rotates on the inner side of the fixed cylinder, a first rack is provided on one side of one of the first expansion plates, the first rack drives the main shaft to rotate while following the movement of the first expansion plate, a second rack driven by the rotation of the main shaft slides on the fixed cylinder, a guide rod is fixed on the second rack, an adjustment frame slides on the guide rod, an expansion block rotates on the adjustment frame, the A telescopic rod is slidably provided at the side wall of the main shaft, one end of the telescopic rod is fixed with a piston rod, the outer side of the piston rod is sleeved with a piston cylinder fixed on the adjusting frame, one end of the piston cylinder is connected with an expansion block, and one end of the expansion block is connected with an air bag; during the rotation of the main shaft, the telescopic rod is driven to move along the main shaft, the telescopic rod drives one end of the piston rod to move inside the piston cylinder, and squeezes the gas inside the piston cylinder into the expansion block, the gas enters the expansion block to expand the air bag and contact and squeeze the O-ring, and the expansion block is canceled after rotating on the adjusting frame.

[0006] Preferably, the fixed platform is fixedly arranged on the workbench, and the workbench and the fixed platform are provided with sliding grooves for the sliding seat to slide.

[0007] Preferably, a first hydraulic rod is fixed on one of the sliding seats, and an output end of the first hydraulic rod is connected to the other sliding seat.

[0008] Preferably, the first expansion plate and the second expansion plate are connected via a second hydraulic rod.

[0009] Preferably, gear a and gear b are respectively mounted on the main shaft, the gear a is meshed with the second rack, and the gear b is meshed with the first rack.

[0010] Preferably, the first rack and the second rack both slide on the fixed cylinder.

[0011] Preferably, a portion of the main shaft is provided with a thread on the outside, and the telescopic rod is connected to the thread on the outside of the main shaft via a ball nut pair.

[0012] Preferably, the adjustment frame slides in a damped manner on the guide rod, and a scale is provided on the outer side of the guide rod.

[0013] Preferably, one end of the piston cylinder is connected to a ventilation hose, and one end of the ventilation hose is connected to the expansion block.

[0014] Preferably, an air outlet is provided at the bottom of the expansion block, and the air outlet is sealed and connected to the adjustment frame.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention utilizes the expansion block to cancel contact with the O-ring in sequence. At this time, only the expansion block remains in contact and extrusion with the O-ring. At this time, except for the side of the O-ring that is in contact and extrusion with the expansion block, the other sides of the O-ring are evenly and accurately connected to the groove. At this time, the staff can be given a final adjustment opportunity to increase the assembly fault tolerance of the O-ring. At this time, the expansion block is rotated. After the expansion block rotates on the adjustment frame, the air outlet on the expansion block and the adjustment frame are unsealed. At this time, the internal gas of the expansion block overflows and the air bag no longer expands. Then, the expansion block and one side of the O-ring are cancelled, so that the O-ring is accurately and completely installed in the groove on the installation part. Therefore, the expansion block can be used to position one side of the O-ring, and each side of the O-ring can be installed in sequence. On the one hand, the accuracy of the assembly of the O-ring is improved, and on the other hand, when assembling the O-ring, the staff can be given modification time, the fault tolerance of the O-ring assembly is improved, and the assembly efficiency and quality of the O-ring are improved.

[0017] The present invention can make the degree of deformation of one side of the O-ring squeezed by the expansion block greater than the degree of deformation of the O-ring squeezed by the expansion block after the expansion block has pre-expanded the O-ring. Therefore, the O-ring can be tested for elasticity and compression resistance by using the expansion block to avoid the O-ring being unable to withstand squeezing within a certain range of force, resulting in poor quality and affecting its quality of use after assembly.

[0018] The present invention pre-expands the O-ring, then places the mounting piece at a certain position, and then uses a positioning mechanism to position the O-ring mounting position, and finally uses this to start the second hydraulic rod, so that the second hydraulic rod moves and cancels the connection with the O-ring, so that one side of the O-ring can be pre-connected with the mounting piece, and after the one side is correctly connected to the ring groove of the mounting piece, the second hydraulic rod moves in sequence, so that multiple sides of the O-ring are correctly connected to the ring groove in sequence, thereby connecting the O-ring to the ring groove in sequence in a certain order, which can ensure the accuracy of the connection between the O-ring and the ring groove, and when the position of the O-ring is offset, time can be reserved for the staff to make timely adjustments, thereby further improving the assembly accuracy of the O-ring and improving the assembly quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a partial structural schematic diagram of the present invention;

[0021] Figure 3 The second schematic diagram of the partial structure of the present invention;

[0022] Figure 4 The third is a partial structural schematic diagram of the present invention;

[0023] Figure 5 This is a partial cross-sectional view of the present invention;

[0024] Figure 6 It is the second partial cross-sectional view of the present invention;

[0025] Figure 7 It is a partial cross-sectional view of the positioning mechanism of the present invention;

[0026] Figure 8 This is the second partial cross-sectional view of the positioning mechanism of the present invention.

[0027] In the figure: 1. workbench; 2. expansion mechanism; 21. fixed table; 22. first hydraulic rod; 23. rotating member; 24. sliding seat; 25. slide groove; 26. rotating seat; 27. first expansion plate; 28. second expansion plate; 29. ​​second hydraulic rod; 3. positioning mechanism; 31. main shaft; 32. fixed cylinder; 33. first rack; 34. second rack; 35. telescopic rod; 36. guide rod; 37. adjustment frame; 38. expansion block; 39. piston rod; 310. piston cylinder; 311. ventilation hose; 312. airbag. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The present invention provides an expansion assembly device for a sealing ring, comprising a workbench 1, on which an expansion mechanism 2 for automatically expanding an O-ring is arranged, the expansion mechanism 2 comprising a fixed table 21 mounted on the workbench 1, on which a plurality of sliding seats 24 are slidably arranged, a rotating member 23 is rotatably arranged at one end of the sliding seat 24, a rotating seat 26 for assisting the sliding of the plurality of sliding seats 24 is rotatably arranged on the fixed table 21, one end of the rotating member 23 is rotatably connected to the rotating seat 26, one end of the sliding seat 24 passes through the fixed table 21 and the workbench 1 and is installed with a first expansion plate 27, a second hydraulic rod 29 is arranged on one side of the first expansion plate 27, a second expansion plate 28 is arranged on the second hydraulic rod 29, in the process of one sliding seat 24 sliding on the fixed table 21, the sliding seat 24 drives the rotating seat 26 on the fixed table by using the rotating member 23 The fixed table 21 rotates on the workbench 1, and then the fixed table 21 drives the other multiple groups of sliding seats 24 to slide by using multiple groups of rotating parts 23, thereby making the first expansion plates 27 on the multiple groups of sliding seats 24 move synchronously on the workbench 1, and the multiple groups of first expansion plates 27 simultaneously drive the second expansion plates 28 to move to squeeze multiple positions of the O-ring, thereby automatically expanding and contracting, and at the same time, multiple groups of second hydraulic rods 29 are used to drive the second expansion plates 28 to move, so as to change the squeezing state of multiple positions of the O-ring; the fixed table 21 is fixedly set on the workbench 1, and the workbench 1 and the fixed table 21 are provided with a slide groove 25 for the sliding of the sliding seat 24, one of the sliding seats 24 is fixed with a first hydraulic rod 22, the output end of the first hydraulic rod 22 is connected to another sliding seat 24, and the first expansion plate 27 and the second expansion plate 28 are connected through the second hydraulic rod 29;

[0030] See also Figures 1 to 5As shown, when expanding the O-ring, the O-ring is pre-placed on the outside of the plurality of second expansion plates 28, and then the first hydraulic rod 22 is started. The output end of the first hydraulic rod 22 drives the sliding seat 24 to move inside the slide groove 25. The sliding seat 24 drives the rotating seat 26 to rotate through the rotating member 23. During the rotation of the rotating seat 26, the rotating seat 26 drives other groups of sliding seats 24 to move on the slide groove 25, thereby the plurality of sliding seats 24 move synchronously, and the plurality of sliding seats 24 drive the first expansion plate 27 to move. The first expansion plate 27 drives the second expansion plate 28 to move through the second hydraulic rod 29 to achieve the expansion effect, thereby pre-expanding the O-ring, and then the mounting member is placed The O-ring is placed at a certain position, and then the positioning mechanism 3 is used to position the O-ring installation position. Finally, the second hydraulic rod 29 can be started to move the second hydraulic rod 29 to cancel the connection with the O-ring. Therefore, one side of the O-ring can be connected to the mounting piece in advance. After the connection position of one side with the ring groove of the mounting piece is correct, the second hydraulic rod 29 moves in sequence to correctly connect multiple sides of the O-ring with the ring groove in sequence. In this way, the O-ring is connected to the ring groove in sequence in a certain order, which can ensure the accuracy of the connection between the O-ring and the ring groove. When the position of the O-ring is offset, time can be reserved for the staff to make timely adjustments, thereby further improving the assembly accuracy of the O-ring and improving the assembly quality.

[0031] The fixed table 21 is provided with a positioning mechanism 3 for assisting the positioning of the O-ring. The positioning mechanism 3 includes a fixed cylinder 32 fixed on the workbench 1. A main shaft 31 is rotatably arranged on the inner side of the fixed cylinder 32. A first rack 33 is arranged on one side of one of the first expansion plates 27. The first rack 33 drives the main shaft 31 to rotate while following the movement of the first expansion plate 27. A second rack 34 driven by the rotation of the main shaft 31 slides on the fixed cylinder 32. A guide rod 36 is fixed on the second rack 34. An adjusting frame 37 slides on the guide rod 36. An expansion block 38 rotates on the adjusting frame 37. A telescopic rod 35 is slidably arranged on the side wall of the main shaft 31. A piston rod 39 is fixed on one end of the telescopic rod 35. A piston cylinder 310 fixed on the adjusting frame 37 is sleeved on the outer side of the piston rod 39. One end of the piston cylinder 310 is connected to the expansion block 38. One end of the expansion block 38 is connected to an air bag 312. During the rotation of the main shaft 31, the telescopic rod 35 is driven to move along the main shaft 31. The retracting rod 35 drives one end of the piston rod 39 to move inside the piston cylinder 310, and squeezes the gas inside the piston cylinder 310 into the expansion block 38. The gas enters the expansion block 38 to expand the airbag 312 and contact and squeeze the O-ring. The expansion block 38 rotates on the adjustment frame 37 to cancel the closed state; the main shaft 31 is respectively installed with a gear a and a gear b, the gear a is meshed with the second rack 34, the gear b is meshed with the first rack 33, the first rack 33 and the second rack 34 are both slid on the fixed cylinder 32, a part of the main shaft 31 is provided with a thread on the outside, the telescopic rod 35 is connected to the outer thread of the main shaft 31 through a ball nut pair, the adjustment frame 37 is damped and slided on the guide rod 36, and the outer side of the guide rod 36 is provided with a scale, one end of the piston cylinder 310 is connected with a ventilation hose 311, one end of the ventilation hose 311 is connected with the expansion block 38, and the bottom of the expansion block 38 is provided with an air outlet, and the air outlet is closed and connected with the adjustment frame 37;

[0032] See also Figures 4 to 8As shown, before the sliding seat 24 moves to pre-expand the O-ring, the sliding adjustment frame 37 is slid. According to the scale on the guide rod 36, the position of the adjustment frame 37 can be adjusted according to the installation position of the O-ring. During the movement of the sliding seat 24, the sliding seat 24 drives the first rack 33 to move through the first expansion plate 27. Since the first rack 33 is meshed with the gear b on the main shaft 31, the main shaft 31 is driven to rotate when the first rack 33 moves. When the main shaft 31 rotates, the second rack 34 is driven to move through the gear a. The second rack 34 is driven by the guide rod 36. The adjusting frame 37 is driven to move, and the adjusting frame 37 drives the expansion block 38 to move, so that the expansion block 38 contacts and squeezes one side of the O-ring. In addition, due to the size design of the adjusting frame 37, after the expansion block 38 has pre-expanded the O-ring, the degree of deformation of the one side of the O-ring squeezed by the expansion block 38 is greater than the degree of deformation of the O-ring squeezed by the expansion block 38. Therefore, the expansion block 38 can be used to test the elasticity and pressure resistance of the O-ring to avoid the O-ring being unable to withstand squeezing within a certain range of force, resulting in poor quality, which affects its quality of use after assembly.

[0033] In addition, during the rotation of the main shaft 31, since the telescopic rod 35 is connected to the outer thread of the main shaft 31 through the ball nut pair, the telescopic rod 35 moves along the main shaft 31 when the main shaft 31 rotates, and the piston rod 39 is driven to move when the telescopic rod 35 moves. At this time, the adjustment frame 37 is fixed on the guide rod 36 after the position adjustment is completed. Therefore, one end of the piston rod 39 moves inside the piston cylinder 310 to drive the internal gas therein to enter the inside of the ventilation hose 311, and the gas enters the inside of the expansion block 38 through the ventilation hose 311. After the gas enters the inside of the expansion block 38, the airbag 312 is driven to expand, so that the airbag 312 is inflated and contacts and squeezes the O-ring, so as to avoid the expansion block 38 being too hard to damage the O-ring and increase the assembly cost; in addition, after the airbag 312 expands, it squeezes the O-ring to form a middle groove, which protects the O-ring on the one hand, and on the other hand, the surface can play a positioning role for the O-ring, so as to avoid the O-ring from being offset when the expansion block 38 successively cancels the contact with the O-ring, thereby improving the accuracy of the position of the O-ring during assembly;

[0034] In addition, when the expansion block 38 is successively cancelled from contact with the O-ring, only the expansion block 38 is left in contact with and squeezed by the O-ring. At this time, except for the side of the O-ring that is in contact with and squeezed by the expansion block 38, the other sides of the O-ring are evenly connected with the groove accurately. At this time, the staff can be given a final adjustment opportunity to increase the assembly tolerance of the O-ring. At this time, the expansion block 38 is rotated. After the expansion block 38 rotates on the adjustment frame 37, the air outlet on the expansion block 38 is cancelled from the adjustment frame 37. At this time, the internal gas of the expansion block 38 overflows, and the air bag 312 no longer expands. Then, the expansion block 38 is cancelled from squeezing one side of the O-ring, so that the O-ring is accurately and completely installed in the groove on the mounting part. Therefore, the expansion block 38 can be used to position one side of the O-ring, and each side of the O-ring can be installed in turn. On the one hand, the accuracy of the assembly of the O-ring is improved, and on the other hand, when assembling the O-ring, the staff can be given modification time, the fault tolerance of the O-ring assembly is improved, and the assembly efficiency and quality of the O-ring are improved.

[0035] Working principle: When expanding the O-ring, the O-ring is placed on the outside of the multiple sets of second expansion plates 28 in advance, and then the first hydraulic rod 22 is started. The output end of the first hydraulic rod 22 drives the sliding seat 24 to move inside the slide groove 25. The sliding seat 24 drives the rotating seat 26 to rotate through the rotating member 23. During the rotation of the rotating seat 26, the rotating seat 26 drives other sets of sliding seats 24 to move on the slide groove 25. Thus, the multiple sets of sliding seats 24 move synchronously, and the multiple sets of sliding seats 24 drive the first expansion plate 27 to move. The first expansion plate 27 drives the second expansion plate 28 to move through the second hydraulic rod 29 to achieve the expansion effect. When the sliding seat 24 moves to Before the O-ring is pre-expanded, the sliding adjustment frame 37 can be adjusted according to the scale on the guide rod 36 according to the installation position of the O-ring. During the movement of the sliding seat 24, the sliding seat 24 drives the first rack 33 to move through the first expansion plate 27. Since the first rack 33 is meshed with the gear b on the main shaft 31, the main shaft 31 is driven to rotate when the first rack 33 moves. When the main shaft 31 rotates, the second rack 34 is driven to move through the gear a. The second rack 34 drives the adjustment frame 37 to move through the guide rod 36, and the adjustment frame 37 drives the expansion block 38 to move, so that the expansion block 38 contacts and squeezes one side of the O-ring. Due to the size design of the adjustment frame 37, after the expansion block 38 has pre-expanded the O-ring, the degree of deformation of the O-ring squeezed by the expansion block 38 is greater than the degree of deformation of the O-ring squeezed by the expansion block 38; during the rotation of the main shaft 31, since the telescopic rod 35 is connected to the outer thread of the main shaft 31 through the ball nut pair, the telescopic rod 35 moves along the main shaft 31 when the main shaft 31 rotates, and the movement of the telescopic rod 35 drives the piston rod 39 to move. At this time, the adjustment frame 37 is fixed on the guide rod 36 after the position adjustment is completed, so one end of the piston rod 39 moves inside the piston cylinder 310 to drive the internal gas thereof into the ventilation hose 3 11, the gas enters the expansion block 38 through the ventilation hose 311, and the gas enters the expansion block 38 to drive the airbag 312 to expand, thereby causing the airbag 312 to expand and contact and squeeze the O-ring, and finally the second hydraulic rod 29 can be started to move the second hydraulic rod 29 to cancel the connection with the O-ring, so that one side of the O-ring can be connected to the mounting part in advance, and after the connection position of one side with the ring groove of the mounting part is correct, the second hydraulic rod 29 moves in sequence to connect multiple sides of the O-ring with the ring groove correctly in sequence, thereby connecting the O-ring with the ring groove in sequence in a certain order, which can ensure the accuracy of the connection between the O-ring and the ring groove.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An expansion assembly device for a sealing ring, comprising a workbench (1), characterized in that: The workbench (1) is provided with an expansion mechanism (2) for automatically expanding the O-ring, the expansion mechanism (2) comprising a fixed table (21) mounted on the workbench (1), a plurality of groups of sliding seats (24) sliding on the fixed table (21), a rotating member (23) rotating at one end of the sliding seat (24), a rotating seat (26) for assisting the sliding of the plurality of groups of sliding seats (24) rotating on the fixed table (21), one end of the rotating member (23) being rotatably connected to the rotating seat (26), one end of the sliding seat (24) passing through the fixed table (21) and the workbench (1) and being installed with a first expansion plate (27), a second hydraulic rod (29) being arranged on one side of the first expansion plate (27), a second hydraulic rod (29) being arranged on the second hydraulic rod (29) two expansion plates (28), wherein when one of the sliding seats (24) slides on the fixed table (21), the sliding seat (24) drives the rotating seat (26) to rotate on the fixed table (21) by using the rotating member (23), and then the fixed table (21) drives the other multiple groups of sliding seats (24) to slide by using multiple groups of rotating members (23), thereby making the multiple groups of first expansion plates (27) on the sliding seats (24) move synchronously on the workbench (1), and the multiple groups of the first expansion plates (27) simultaneously drive the second expansion plates (28) to move to squeeze multiple positions of the O-ring and thereby automatically expand and contract, and at the same time, the multiple groups of the second hydraulic rods (29) drive the second expansion plates (28) to move so as to change the squeezing state of multiple positions of the O-ring; The fixed table (21) is provided with a positioning mechanism (3) for assisting in positioning the O-ring, the positioning mechanism (3) comprising a fixed cylinder (32) fixed on the workbench (1), a main shaft (31) being rotatable on the inner side of the fixed cylinder (32), a first rack (33) being provided on one side of one of the first expansion plates (27), the first rack (33) driving the main shaft (31) to rotate while following the movement of the first expansion plate (27), a second rack (34) being slidably provided on the fixed cylinder (32) and being driven by the rotation of the main shaft (31), the second rack (34) being rotatable on the inner side of the fixed cylinder (32), A guide rod (36) is fixed on the strip (34), an adjustment frame (37) is slidably mounted on the guide rod (36), an expansion block (38) is rotatably mounted on the adjustment frame (37), a telescopic rod (35) is slidably mounted on the side wall of the main shaft (31), a piston rod (39) is fixed to one end of the telescopic rod (35), a piston cylinder (310) fixed to the adjustment frame (37) is sleeved on the outer side of the piston rod (39), one end of the piston cylinder (310) is communicated with the expansion block (38), and one end of the expansion block (38) is communicated with an air bag (312); During the rotation of the main shaft (31), the telescopic rod (35) is driven to move along the main shaft (31). The telescopic rod (35) drives one end of the piston rod (39) to move inside the piston cylinder (310) and squeezes the gas inside the piston cylinder (310) into the expansion block (38). The gas enters the expansion block (38) to expand the airbag (312) and contact and squeeze the O-ring. After the expansion block (38) rotates on the adjustment frame (37), the closed state is canceled.

2. An expansion assembly device for a sealing ring according to claim 1, characterized in that: The fixed platform (21) is fixedly arranged on the workbench (1), and a sliding groove (25) for the sliding seat (24) to slide is provided on the workbench (1) and the fixed platform (21).

3. The expansion assembly device for a sealing ring according to claim 1, characterized in that: A first hydraulic rod (22) is fixed on one of the sliding seats (24), and an output end of the first hydraulic rod (22) is connected to the other sliding seat (24).

4. The expansion assembly device for a sealing ring according to claim 1, characterized in that: The first expansion plate (27) and the second expansion plate (28) are connected via a second hydraulic rod (29).

5. The expansion assembly device for a sealing ring according to claim 1, characterized in that: A gear a and a gear b are respectively mounted on the main shaft (31); the gear a meshes with the second rack (34), and the gear b meshes with the first rack (33).

6. The expansion assembly device for a sealing ring according to claim 1, characterized in that: The first rack (33) and the second rack (34) both slide on the fixed cylinder (32).

7. The expansion assembly device for a sealing ring according to claim 1, characterized in that: A portion of the main shaft (31) is provided with a thread on its outer side, and the telescopic rod (35) is connected to the thread on the outer side of the main shaft (31) via a ball nut pair.

8. The expansion assembly device for a sealing ring according to claim 1, characterized in that: The adjustment frame (37) slides damped on the guide rod (36), and a scale is provided on the outer side of the guide rod (36).

9. The expansion assembly device for a sealing ring according to claim 1, characterized in that: One end of the piston cylinder (310) is connected to a ventilation hose (311), and one end of the ventilation hose (311) is connected to an expansion block (38).

10. The expansion assembly device for a sealing ring according to claim 1, characterized in that: The bottom of the expansion block (38) is provided with an air outlet hole, and the air outlet hole is closed and connected to the adjustment frame (37).

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