A composite seal ring for gas inflation and upset and a sealing system thereof

Abstract

The present application relates to a kind of composite sealing ring for air upsetting and its sealing system, belong to sealing accessory technical field, solve the problem that sealing ring between sealed member and mould in prior art is easy to leak and fail and poor sealing effect, short service life.A kind of composite sealing ring for air upsetting includes sealing strip, silica gel ring and inflatable sealing ring;Silica gel ring is sleeved on the outer wall of inflatable sealing ring, sealing strip is sleeved on the outer wall of silica gel ring, sealing strip, silica gel ring and inflatable sealing ring are in close contact with each other.The silica gel ring and sealing strip of inflatable sealing ring outer wall setting in the present application, good protection effect is played to inflatable sealing ring, avoid inflatable sealing ring to leak, improve service life;While silica gel ring and sealing strip can multiply increase the friction between inflatable sealing ring and sealed member, improve the sealing effect of composite sealing ring.

Description

Technical Field

[0001] This invention relates to the field of sealing fittings technology, and in particular to a composite sealing ring and its sealing system for pneumatic upsetting. Background Technology

[0002] In the process of pneumatic upsetting, a reliable seal is required between the blank (i.e. the sealed part) and the mold.

[0003] However, existing sealing structures are simplistic and, while achieving a sealing effect, still have some shortcomings. Traditional methods commonly use pneumatic sealing rings, which rely on the interference fit between the outer ring of the sealing ring and the workpiece for sealing. When the workpiece is axially fed, the high friction between the workpiece and the outer ring of the sealing ring often causes excessive wear or even pulls the outer ring of the sealing ring out of the sealing groove. This results in the pneumatic sealing ring lacking external constraint, leading to sealing ring failure. Consequently, its service life is short, affecting the actual production process and increasing the production cycle and cost that requires frequent sealing ring replacements. Summary of the Invention

[0004] Based on the above analysis, the present invention aims to provide a composite sealing ring and its sealing system for pneumatic upsetting, in order to solve the problems of easy air leakage and failure of the sealing ring between the sealed part and the mold in the prior art, as well as poor sealing effect and short service life.

[0005] The objective of this invention is mainly achieved through the following technical solutions:

[0006] A composite sealing ring for pneumatic upsetting includes a sealing strip, a silicone ring, and an inflatable sealing ring; the silicone ring is sleeved on the outer wall of the inflatable sealing ring, the sealing strip is sleeved on the outer wall of the silicone ring, and the sealing strip, silicone ring, and inflatable sealing ring are in contact with each other.

[0007] Furthermore, multiple sealing strips are provided.

[0008] Furthermore, both the sealing strip and the silicone ring are solid structures.

[0009] Furthermore, the inflatable sealing ring has a hollow structure.

[0010] Furthermore, multiple sealing strips are fitted parallel to each other onto the outer wall of the silicone ring.

[0011] Furthermore, the silicone ring includes an outer wall and an inner wall; the outer wall of the ring is fitted with the sealing strip, and the inner wall of the ring is fitted with the inflatable sealing ring.

[0012] Furthermore, the inflatable sealing ring includes an inflation part and an air inlet part.

[0013] Furthermore, a sealing system for a composite sealing ring used in pneumatic upsetting includes the aforementioned composite sealing ring for pneumatic upsetting, a sealed component, and a mold; the composite sealing ring is fitted over the mold to seal the sealed component.

[0014] Furthermore, the mold includes a sealing groove and an air inlet hole.

[0015] Furthermore, the sealing groove is circumferentially disposed on the outer wall of the mold, and the air inlet hole is vertically disposed on the inner wall of the sealing groove.

[0016] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0017] (1) The composite sealing ring for pneumatic upsetting of the present invention includes a sealing strip, a silicone ring, and an inflatable sealing ring. The silicone ring is fitted onto the outer wall of the inflatable sealing ring, and one or more sealing strips are fitted onto the outer wall of the silicone ring. The three components are in close contact with each other to form a composite sealing ring structure for pneumatic upsetting. The composite sealing ring is fitted onto the mold. By inflating the inflatable sealing ring, the silicone ring and sealing strip expand, thereby making the sealing strip fit against the inner wall of the sealed part, achieving a sealing effect on the sealed part. The silicone ring and sealing strip on the outer wall of the inflatable sealing ring provide good protection for the inflatable sealing ring, preventing air leakage and improving its service life. At the same time, the silicone ring and sealing strip can multiply the friction between the inflatable sealing ring and the sealed part, improving the sealing effect of the composite sealing ring.

[0018] (2) The present invention has multiple sealing strips arranged in parallel along the axial direction of the silicone ring and fitted onto the outer wall of the silicone ring to form a multi-level sealing structure. This multi-level sealing structure enables effective sealing between the sealed part and the mold. Since there are multiple sealing strips, even if individual sealing strips are damaged or fail to adhere to the inner wall of the sealed part, the other intact sealing strips can still ensure effective sealing of the sealed part. Even if there are assembly errors in the sealing strips that cause slight leakage in individual sealing strips, the multi-level sealing structure can reduce leakage step by step, meaning that the other undamaged sealing strips can still ensure effective sealing.

[0019] (3) The length of the multiple sealing strips arranged side by side in this invention is not greater than the width of the outer wall of the silicone ring, so that the sealing strips can be tightly attached to the outer wall of the silicone ring after the inflated sealing ring expands, so that each sealing strip has a fastening effect and a friction effect on the silicone ring.

[0020] (4) When multiple sealing strips are closely arranged on the outer wall of the silicone ring, some sealing strips may fold or overlap due to excessive density, resulting in slight air leakage at the folds. Even if there are multiple folds in the sealing ring, the unfolded parts still play a sealing role, which gradually reduces the leakage in the multi-stage sealing structure. Thus, the sealing effect of the composite sealing ring is still considerable and can meet the material replenishment requirements.

[0021] (5) After the air chamber of the composite sealing ring of the present invention is inflated, the inflated sealing ring expands and is simultaneously subjected to axial upsetting. The friction between the inner wall of the sealed part and the sealing strip is converted into rotational friction between the sealing strip and the inner wall of the sealed part, which greatly reduces the friction force on the sealing strip, which is beneficial to the axial feeding of the sealed part and avoids the composite sealing ring being pulled out of the sealing groove.

[0022] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or may be learned by practicing the invention. Attached Figure Description

[0023] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0024] Figure 1 This is a schematic diagram of the composite sealing ring used in pneumatic upsetting according to the present invention;

[0025] Figure 2 This is a schematic diagram of the composite sealing ring of the present invention used in pneumatic upsetting during the application process;

[0026] Figure 3 This is a cross-sectional view of a first embodiment of the composite sealing ring for pneumatic upsetting according to the present invention. Figure 1 ;

[0027] Figure 4 A cross-sectional view of a modified embodiment of the composite sealing ring for pneumatic upsetting according to the present invention. Figure 2 ;

[0028] Figure 5 This is a top view of a first embodiment of the composite sealing ring for pneumatic upsetting according to the present invention. Figure 1 ;

[0029] Figure 6 This is a top view of a first embodiment of the composite sealing ring for pneumatic upsetting according to the present invention. Figure 2 ;

[0030] Figure 7This is a cross-sectional view of the sealed component during the feeding process of the composite sealing ring used for pneumatic upsetting according to the present invention.

[0031] Figure 8 This is a cross-sectional view of Embodiment 2 of the composite sealing ring for pneumatic upsetting according to the present invention;

[0032] Figure 9 This is a cross-sectional view of a modified embodiment of the composite sealing ring for pneumatic upsetting according to the present invention;

[0033] Figure 10 This is a cross-sectional view of Embodiment 3 of the composite sealing ring for pneumatic upsetting according to the present invention;

[0034] Figure 11 This is a cross-sectional view of the composite sealing ring of the present invention for pneumatic upsetting before and after inflation, in Embodiment 4.

[0035] Figure 12 This is a cross-sectional view of Embodiment 5 of the composite sealing ring for pneumatic upsetting according to the present invention. Figure 1 ;

[0036] Figure 13 This is a cross-sectional view of Embodiment 5 of the composite sealing ring for pneumatic upsetting according to the present invention. Figure 2 .

[0037] Figure label:

[0038] 1-Sealing strip; 2-Silicone ring; 21-Outer wall of the ring; 22-Inner wall of the ring; 3-Inflatable sealing ring; 31-Inflatable part; 311-Inflatable ring; 312-Inflatable cavity; 32-Inlet part; 321-Inlet nozzle; 322-Inlet cavity; 4-Sealed part; 5-Mold; 51-Sealing groove; 52-Inlet hole. Detailed Implementation

[0039] The following describes specific embodiments and accompanying drawings. Figures 1-13 A further detailed description of a composite sealing ring for pneumatic upsetting is provided. These embodiments are for comparative and illustrative purposes only, and the invention is not limited to these embodiments.

[0040] Example 1

[0041] A specific embodiment of the present invention, such as Figure 1 As shown, a composite sealing ring for pneumatic upsetting is disclosed, including a sealing strip 1, a silicone ring 2 and a pneumatic sealing ring 3. The silicone ring 2 is sleeved on the outer wall of the pneumatic sealing ring 3, and one or more sealing strips 1 are sleeved on the outer wall of the silicone ring 2. The three are in close contact with each other to form a composite sealing ring structure for pneumatic upsetting.

[0042] A sealing system for a composite sealing ring used in pneumatic upsetting includes a composite sealing ring for pneumatic upsetting, a sealed component 4, and a mold 5.

[0043] The composite sealing ring is fitted onto the mold 5. By inflating the gas sealing ring 3, the silicone ring 2 and the sealing strip 1 expand, thereby making the sealing strip 1 fit against the inner wall of the sealed part 4, achieving a sealing effect on the sealed part 4.

[0044] When implementing, such as Figure 2 As shown, in order to effectively seal the part to be sealed 4 and the mold 5, the part to be sealed 4 and the mold 5 are first separated, the composite sealing ring is put on the part to be sealed 4, the mold 5 with the composite sealing ring is then placed into the part to be sealed 4, and then the inflatable sealing ring 3 in the composite sealing ring is inflated so that the outermost sealing strip 1 of the composite sealing ring is tightly attached to the inner wall of the part to be sealed 4, thus completing the seal.

[0045] Among them, the sealing strip 1, silicone ring 2 and inflatable sealing ring 3 are all made of thermosetting materials with high elasticity and high toughness.

[0046] Specifically, the inflatable sealing ring 3 is made of silicone, and the sealing strip 1 is made of rubber.

[0047] Compared with the prior art, in addition to the inflatable sealing ring 3, the composite sealing ring of this embodiment also has a silicone ring 2 and a sealing strip 1 on the outer wall of the inflatable sealing ring 3, which play a good protective role for the inflatable sealing ring 3 and prevent the inflatable sealing ring from leaking air. At the same time, the silicone ring 2 and the sealing strip 1 can multiply the friction between the inflatable sealing ring 3 and the sealed part 4, and improve the sealing effect of the composite sealing ring.

[0048] The composite sealing ring is constructed by placing an inflatable sealing ring 3 on the innermost side of the sealing groove of the mold 5, then placing a silicone ring 2 on the outer side of the inflatable sealing ring 3, and finally placing the sealing strips 1 one by one along the axial direction of the sealing groove of the mold 5 on the outer side of the silicone ring 2.

[0049] After the composite sealing ring is installed, the inflatable sealing ring 3 is inflated. The inflatable sealing ring 3 expands, which in turn causes the silicone ring 2 and the sealing strip 1 to expand. After expansion, the sealing strip 1 is in close contact with the sealed part 4 on the relatively flat outer surface of the silicone ring 2, thereby obtaining a reliable seal.

[0050] In actual production, the inflatable sealing ring 3, which is in direct contact with air pressure, is most prone to failure. The silicone ring 2 tightly wraps around the inflatable sealing ring 3, thus protecting it. Similarly, the sealing strip 1 also protects the silicone ring 2.

[0051] Among them, such as Figure 3 As shown, sealing strip 1, silicone ring 2, and inflatable sealing ring 3 are all closed rings.

[0052] Specifically, both the sealing strip 1 and the silicone ring 2 are solid circular structures, with the sealing strip 1 having a circular cross-section and the silicone ring 2 having a rectangular or rectangular cross-section.

[0053] Multiple sealing strips 1 are arranged in parallel along the axial direction of the silicone ring 2 and fitted onto the outer wall of the silicone ring 2.

[0054] Specifically, the surface of the silicone ring 2 that is in contact with the sealing strip 1 is the outer wall 21 of the silicone ring, and the surface of the silicone ring 2 that is in contact with the inflatable sealing ring 3 is the inner wall 22 of the silicone ring.

[0055] like Figure 4 As shown, the inflatable sealing ring 3 includes an inflation part 31 and an air inlet part 32. The inflation part 31 is a hollow annular structure with a hollow rectangular cross-section. There is only one air inlet part 32, which is used for gas filling. The air inlet part 32 is a hollow cylindrical structure and is vertically arranged on the inner wall of the inflation part 31.

[0056] The inflation part 31 includes an inflation ring 311 and an inflation cavity 312, with the hollow space inside the inflation ring 311 forming the inflation cavity 312.

[0057] In addition, the air inlet 32 ​​includes an air inlet nozzle 321 and an air inlet cavity 322. The hollow space inside the air inlet nozzle 321 forms the air inlet cavity 322. The inflation cavity 312 is connected to the air inlet cavity 322 to form an integral cavity for filling the inflation sealing ring 3 with gas during inflation upsetting.

[0058] like Figure 2 As shown, mold 5 is a mandrel, and mold 5 includes a sealing groove 51 and an air inlet hole 52. The sealing groove 51 and the air inlet hole 52 are arranged in pairs. The sealing groove 51 is circumferentially disposed on the outer wall of mold 5, and the air inlet hole 52 is vertically disposed on the inner side wall of the sealing groove 51. The sealing groove 51 is used to accommodate the inflation ring 311, and the air inlet hole 52 is used to accommodate the air inlet nozzle 321.

[0059] When the inflatable sealing ring 3 is put on the mold 5, first insert the air inlet 32 ​​of the inflatable sealing ring 3 into the air inlet hole 52 of the mold 5, use the air inlet 32 ​​for positioning, and then put the entire inflatable part 31 into the sealing groove 51 of the mold 5 with the air inlet as the reference.

[0060] Among them, the length of multiple sealing strips 1 arranged side by side is not greater than the width of the outer wall 21 of the silicone ring 2, so that the sealing strips 1 can be tightly attached to the outer wall 21 of the silicone ring 2 after the inflated sealing ring 3 expands, so that each sealing strip 1 has a fastening effect and a friction effect on the silicone ring 2.

[0061] Furthermore, the axial width of the inflatable part 31 of the inflatable sealing ring 3, the axial width of the silicone ring 2, and the axial width of the sealing groove 51 of the mold 5 are the same. This is to ensure that the composite sealing ring can fit tightly and prevent displacement.

[0062] Furthermore, the diameter of the cross-section of the sealing strip 1 is 0.05 to 0.2 times the axial width of the outer wall 21 of the rubber ring, so that the outer wall 21 of the rubber ring can accommodate 5 to 20 sealing strips 1 arranged side by side, so that the composite sealing ring has enough sealing strips 1 to play an effective sealing role.

[0063] Furthermore, the radial width of the silicone ring 2 is 0.1 to 1 times the axial width of the silicone ring 2.

[0064] Furthermore, before inflation, the gap between the sealing strip 1 and the sealed part 4 is 0.5mm to 3mm.

[0065] Preferably, the gap between the sealing strip 1 and the sealed part 4 is 2mm.

[0066] Furthermore, the inner diameter of the silicone ring 2 is smaller than the outer diameter of the inflatable sealing ring 3, with the inner diameter of the silicone ring 2 being 97%-99% of the outer diameter of the inflatable sealing ring 3; the inner diameter of the inflatable sealing ring 3 is smaller than the diameter of the sealing groove 51, with the inner diameter of the inflatable sealing ring 3 being 97%-99% of the diameter of the sealing groove 51; and the diameter of the sealing strip 1 is smaller than the inner diameter of the inflatable sealing ring 3, with the diameter of the sealing strip 1 being 70%-80% of the inner diameter of the inflatable sealing ring 3. This ensures that the sealing strip 1, silicone ring 2, and inflatable sealing ring 3 can tightly wrap together, preventing them from coming off.

[0067] Furthermore, the outer wall 21, inner wall 22, and outer wall surface of the cross-section of the silicone ring 2 and the inflatable ring 311 are all straight lines, which allows the silicone ring 2 to fit well with the inflatable sealing ring 3, while the sealing strip 1 can be evenly disposed on the outer wall 21 of the silicone ring.

[0068] Specifically, the sealing strip 1 is an O-ring sealing strip, and multiple parallel sealing strips 1 make the outer layer of the composite sealing ring form a multi-level sealing structure.

[0069] This multi-stage sealing structure enables effective sealing between the sealed component 4 and the mold 5. Since there are multiple sealing strips 1, even if one sealing strip 1 is damaged or fails to adhere to the inner wall of the sealed component, the other intact sealing strips 1 can still ensure effective sealing of the sealed component 4. Even if there is an assembly error in the sealing strip 1 that causes slight leakage in one of the sealing strips 1, the multi-stage sealing structure can reduce the leakage step by step, meaning that the other undamaged sealing strips 1 can still ensure effective sealing.

[0070] like Figures 5-6As shown, when multiple sealing strips 1 are arranged closely side by side, the a ring and b ring of sealing strip 1 fold or overlap during the sealing process due to the excessive tightness between the sealing strips 1. The sealing strip 1 folded on top cannot fit with the silicone ring 2, resulting in a slight air leakage at the fold.

[0071] Even so, the c-ring of the next sealing strip 1 still provides a seal if it does not fold. Even with multiple folds in sealing strip 1, which gradually reduces leakage in the multi-stage sealing structure, the composite sealing ring still provides a considerable sealing effect and meets the material replenishment requirements.

[0072] Preferred, such as Figure 7 As shown, during the pneumatic upsetting process of the composite sealing ring, when multiple sealing strips 1 are evenly distributed on the outer wall 21 of the silicone ring 2, and the distance L1 between the feed end of the outer wall 21 of the ring and the nearest sealing strip 1 is greater than or equal to the amount of material added, the sealing strip 1 can contact the inner wall of the sealed component 4, allowing the sealing strip 1 to roll and rub on the silicone ring 2 without the aforementioned folding between the sealing strips 1, and the silicone ring 2 does not contact the sealed component 4. This is the most ideal sealing state in this embodiment.

[0073] In addition, during the inflation and upsetting process of the composite sealing ring, after the inflation chamber 312 is inflated, the inflation sealing ring 3 expands and undergoes axial upsetting at the same time. The friction between the inner wall of the sealed part 4 and the sealing strip 1 is transformed into rotational friction between the sealing strip 1 and the inner wall of the sealed part 4, which greatly reduces the friction force on the sealing strip 1, which is beneficial to the axial feeding of the sealed part 4 and prevents the composite sealing ring from being pulled out of the sealing groove 51.

[0074] Compared with the prior art, this embodiment transforms the friction between the sealed part 4 and the composite sealing ring into the rolling friction of the sealing strip 1 by setting a sealing strip 1 and a silicone ring 2 on the outside of the inflatable sealing ring 3. This greatly reduces the friction force, reduces the wear of the composite sealing ring, and also reduces the probability of the composite sealing ring being pulled out of the sealing groove 511.

[0075] Example 2

[0076] like Figure 8 As shown, in Example 2, based on Example 1, the outer wall 21, inner wall 22, and outer wall of the inflatable ring 311 of the silicone ring 2 are all changed to convex shape.

[0077] This structure increases the contact area between the silicone ring 2 and the inflatable sealing ring 3, thereby increasing the friction between them. The outer wall 21 of the silicone ring 2 is convex, allowing the sealing strip 1 to avoid the convex part of the outer wall 21 and be positioned at both ends of the outer wall 21. This allows part of the outer wall 21 of the silicone ring 2 to directly contact the inner wall of the sealed component 4, achieving friction. The sealing strips 1 on both sides also achieve rolling friction with the inner wall of the sealed component 4.

[0078] Therefore, the composite sealing ring can combine rolling friction and contact friction to enhance the sealing effect. Furthermore, even if adjacent sealing strips overlap, it can actually improve the sealing effect.

[0079] like Figure 9 As shown, the variation of Example 2 is based on Example 1, except that the outer wall 21 of the silicone ring 2 is changed to a convex shape.

[0080] Example 3

[0081] like Figure 10 As shown, in Example 3, based on Example 1, the outer wall 21 of the silicone ring 2 is changed to a concave shape.

[0082] The outer wall 21 of the silicone ring 2 is concave, which allows the sealing strip 1 to be confined in the concave part of the outer wall 21 of the silicone ring, preventing the sealing strip 1 from falling off the silicone ring 2 when replenishing material.

[0083] At this point, the two ends of the outer wall 21 of the silicone ring 2 directly contact the inner wall of the sealed component 4, achieving sealing and contact friction, while the middle sealing strip 1 achieves rolling friction with the inner wall of the sealed component 4. Therefore, the composite sealing ring can achieve a combination of rolling friction and contact friction, increasing the sealing effect. In addition, even if there is overlap between adjacent sealing strips 1, it can actually promote the sealing effect.

[0084] Example 4

[0085] like Figure 11 As shown, in Example 4, the air ring 311 of the air sealing ring 3 is changed to a concave shape, based on Example 1.

[0086] This design allows for a greater degree of expansion of the inflatable sealing ring 3, improving the sealing effect. Furthermore, after expansion, the inflatable sealing ring 3 becomes convex, as shown in Example 2, causing the sealing strip 1 to converge on both sides of the silicone ring, achieving the sealing effect described in Example 2.

[0087] Furthermore, this embodiment can further improve the sealing effect by changing the degree of bulging of the inflatable sealing ring after expansion and increasing the thickness of the silicone ring 2.

[0088] Example 5

[0089] like Figures 12-13 As shown, in Embodiment 5, based on Embodiment 1, the air inlet 32 ​​of the inflatable sealing ring 3 is vertically disposed on the side wall of the inflatable part 31, with the openings facing two different directions of the side walls. This arrangement requires that the air inlet holes 52 of the mold 5 be disposed at both ends of the mold, corresponding to the positions of the air inlet 32. This makes the inflation method more flexible, allowing inflation to be performed from the side of the mold 5, avoiding the need to insert the inlet hole into the mold 5 for inflation.

[0090] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A sealing system for a composite sealing ring used in pneumatic upsetting, characterized in that, It includes a composite sealing ring for pneumatic upsetting, a sealed component (4), and a mold (5); the composite sealing ring is fitted onto the mold (5) to seal the sealed component (4); The composite sealing ring includes a sealing strip (1), a silicone ring (2), and an inflatable sealing ring (3); the silicone ring (2) is fitted onto the outer wall of the inflatable sealing ring (3), the sealing strip (1) is fitted onto the outer wall of the silicone ring (2), and the sealing strip (1), silicone ring (2), and inflatable sealing ring (3) are in contact with each other; multiple sealing strips (1) are provided, and multiple sealing strips (1) are fitted parallel to the outer wall of the silicone ring (2), so that the outer layer of the composite sealing ring forms a multi-level sealing structure; the silicone ring (2) includes an outer wall (21) and an inner wall (22), the outer wall (21) is in contact with the sealing strip (1), the inner wall (22) is in contact with the inflatable sealing ring (3), the outer wall (21) is concave, and the sealing strip (1) is confined to the concave part of the outer wall; The inflatable sealing ring (3) includes an inflation part (31) and an air inlet part (32), the air inlet part (32) being vertically disposed on the outer wall of the inflation part (31); the mold (5) includes a sealing groove (51) and an air inlet hole (52), the sealing groove (51) and the air inlet hole (52) being arranged in pairs, the sealing groove (51) being circumferentially disposed on the outer wall of the mold (5), the air inlet hole (52) being vertically disposed on the side wall of the sealing groove (51), the sealing groove (51) being used to accommodate the inflation part (31), and the air inlet hole (52) being used to accommodate the air inlet part (32); The sealing strip (1) is an O-type sealing strip, and multiple sealing strips (1) can roll on the silicone ring (2); after the inflation part (31) is inflated, the inflation sealing ring (3) expands and simultaneously undergoes axial upsetting. During the upsetting process, the sealing strip (1) rolls along the inner wall of the sealed part (4).

2. The sealing system for a composite sealing ring used in pneumatic upsetting according to claim 1, characterized in that, Both the sealing strip (1) and the silicone ring (2) are solid structures.

3. The sealing system for a composite sealing ring used in pneumatic upsetting according to claim 1, characterized in that, The inflatable sealing ring (3) is a hollow structure.

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