A sealing body and a pipe end face cutting-in sealing device

Abstract

The application provides a sealing body and a pipe end face cutting sealing device, and relates to the technical field of sealing devices.A sealing body comprises a sealing ring, one end of the sealing ring is a cutting end, the other end is a sealing end, and the sealing end is provided with a vent hole.The application also provides a pipe end face cutting sealing device, which comprises the sealing body and further comprises a guide sealing seat and a driving mechanism, the sealing ring is slidingly arranged in the guide sealing seat, the driving mechanism is arranged on the guide sealing seat and is in driving connection with the sealing ring, and the driving mechanism is used for driving the sealing ring to axially and reciprocally slide along the guide sealing seat.By using the application, the original sealing form that the soft sealing device is attached to the high-temperature pipe blank is modified into the sealing form that the sealing body made of hard material cuts into the end face of the high-temperature pipe blank, the pipe blank material is tightly extruded, attached and wrapped on the surface of the sealing body to realize sealing, the problem that the production line is stopped due to the frequent damage of the soft sealing device is avoided, and the stability of the blowing process is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of sealing device technology, and more specifically, to a sealing body and a pipe end face cutting sealing device. Background Technology

[0002] To achieve better pressure resistance and crack resistance, PVC-O pipes and fittings require processes such as expansion and blow-blowing to alter the arrangement of molecular chains within the material, thereby improving its properties. The blow-blowing process involves introducing a high-pressure medium into a high-temperature pipe blank, causing it to expand and conform to a mold. During blow-blowing, the medium must be sealed within the high-temperature pipe blank to prevent leakage. Currently, these processes use soft, elastic materials as sealing devices. However, under high pressure, high temperature, and large gap conditions, these soft, elastic materials are extremely prone to cracking, wear, and detachment. Once these issues occur, production lines often need to be suspended, or even shut down, to address the problems. Furthermore, the failure rate of sealing devices is consistently high, sometimes requiring multiple repairs per shift, severely impacting production capacity and resulting in significant losses of manpower and resources. Summary of the Invention

[0003] The purpose of this invention is to provide a sealing body and a pipe end face cutting sealing device, which modifies the original method of sealing by attaching a soft sealing device to a high-temperature pipe blank, and instead uses a sealing body made of hard material to cut into the end face of the high-temperature pipe blank. The sealing is achieved by the tight compression, adhesion and wrapping of the pipe blank material and the surface of the sealing body, which avoids the production line stoppage caused by frequent damage to soft sealing devices and greatly improves the stability of the blowing process.

[0004] The technical solution adopted in this invention is as follows: In a first aspect, this application provides a sealing body, including a sealing ring, one end of which is a cutting end and the other end is a sealing end, and the sealing end is provided with at least one vent hole communicating with the interior of the sealing ring.

[0005] Furthermore, in some embodiments of the present invention, the thickness of the cut-in end gradually decreases from the sealing end toward the cut-in end.

[0006] Furthermore, in some embodiments of the present invention, the outer wall of the sealing ring is provided with a plurality of mounting slots at intervals.

[0007] Furthermore, in some embodiments of the present invention, the sealing end is provided with a mounting hole.

[0008] Secondly, this application provides a pipe end face cutting sealing device, including the aforementioned sealing body, and further comprising: The guide sealing seat has an open end, and the sealing ring is slidably disposed inside the guide sealing seat and coaxial with the guide sealing seat. The cutting end is located on the side close to the open end. The drive mechanism is located on the guide sealing seat and is driven to connect with the sealing ring. The drive mechanism is used to drive the sealing ring to slide back and forth along the axial direction of the guide sealing seat.

[0009] Furthermore, in some embodiments of the present invention, the other end of the guide sealing seat away from the open end is a closed end, and a sealed air intake and exhaust chamber is formed between the inner sidewall of the guide sealing seat, the closed end and the sealing end, and the guide sealing seat is provided with an air intake and exhaust connector that communicates with the air intake and exhaust chamber.

[0010] Furthermore, in some embodiments of the present invention, a sealing ring is sleeved on the outer wall of the sealing ring, and the outer wall of the sealing ring slides against the inner wall of the guide sealing seat.

[0011] Furthermore, in some embodiments of the present invention, a centering ring is sleeved on the outer wall of the sealing ring, and the outer wall of the centering ring is slidably connected to the inner wall of the guide sealing seat.

[0012] Furthermore, in some embodiments of the present invention, the driving mechanism includes a telescopic cylinder disposed on the guide sealing seat, the telescopic cylinder having a piston rod, one end of which is inserted into the guide sealing seat and connected to the sealing ring.

[0013] Compared with the prior art, the present invention has at least the following advantages or beneficial effects: This application modifies the original method of sealing by attaching soft sealing devices to high-temperature tube blanks by inserting a sealing body made of hard material into the end face of the high-temperature tube blank. The sealing is achieved by the tight compression, adhesion and wrapping of the tube blank material and the surface of the sealing body. This avoids the production line stoppage caused by frequent damage to soft sealing devices and greatly improves the stability of the blow-up process. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A partial cross-sectional view of the sealing body provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the pipe end face cutting sealing device provided in an embodiment of the present invention; Figure 3 A partial cross-sectional view of the pipe end face cutting sealing device provided in an embodiment of the present invention in an unsealed state; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 A partial cross-sectional view of the pipe end face cutting sealing device provided in an embodiment of the present invention in a sealed state; Figure 6 This is a partial cross-sectional view of the pipe end face cutting sealing device provided in an embodiment of the present invention after the pipe blank has expanded.

[0016] Icons: 10-Sealing ring; 11-Cutting end; 12-Sealing end; 121-Vent hole; 13-Mounting slot; 14-Mounting hole; 15-Sealing ring; 16-Centering ring; 20-Guide sealing seat; 21-Inlet and outlet chamber; 22-Inlet and outlet connector; 30-Drive mechanism; 31-Telescopic cylinder; 32-Piston rod; 40-Tube blank; 50-Mold. Detailed Implementation

[0017] The embodiments of this application will now be described in detail with reference to the accompanying drawings. Example

[0018] Please refer to Figure 1 This embodiment provides a sealing body, including a sealing ring 10. The sealing ring 10 in this embodiment is made of a hard material, preferably a metal ring, but it can also be made of hard materials such as ceramics or engineering plastics. One end of the sealing ring 10 is a cutting end 11, and the other end is a sealing end 12. The sealing end 12 is provided with at least one vent hole 121 communicating with the interior of the sealing ring 10. The sealing end 12 has a planar structure, and there are multiple vent holes 121 evenly distributed on the sealing end 12. The cutting end 11 is used to cut into the end face of the tube blank. In order to facilitate cutting into the end face of the tube blank, the thickness of the cutting end 11 gradually decreases from the sealing end 12 toward the cutting end 11, so the end of the cutting end 11 has a pointed structure. The end of the cutting end 11 can also be a rounded or blunt structure, which facilitates cutting into the end face of the tube blank to form a seal. In this embodiment, the outer side wall of the sealing ring 10 is provided with a plurality of mounting slots 13 at intervals, and the sealing end 12 is provided with mounting holes 14. The mounting slots 13 are used to install the sealing ring 15 and the centering ring 16, and the mounting holes 14 are used to install the piston rod 32.

[0019] like Figures 1-6As shown, this embodiment also provides a pipe end face cutting sealing device, including the sealing body described above, and further including a guide sealing seat 20 and a driving mechanism 30. The guide sealing seat 20 is a hollow cylindrical structure. One end of the guide sealing seat 20 is an open end. The sealing ring 10 is slidably disposed in the guide sealing seat 20 and coaxial with the guide sealing seat 20. The cutting end 11 is located on the side close to the open end. The vent hole 121 of the sealing ring 10 is used to connect to the air source to introduce high pressure medium. Preferably, the other end of the guide sealing seat 20 away from the open end is a closed end. A sealed air inlet and outlet chamber 21 is formed between the inner wall of the guide sealing seat 20, the closed end and the sealing end 12. The guide sealing seat 20 is provided with an air inlet and outlet connector 22 that connects to the air inlet and outlet chamber 21.

[0020] A drive mechanism 30 is located on the guide sealing seat 20 and is drivenly connected to the sealing ring 10. The drive mechanism 30 is used to drive the sealing ring 10 to slide back and forth axially along the guide sealing seat 20. In this embodiment, the drive mechanism 30 is preferably a telescopic cylinder 31. The telescopic cylinder 31 is located on the closed end side of the guide sealing seat 20. The telescopic cylinder 31 has a piston rod 32. One end of the piston rod 32 is slidably inserted into the guide sealing seat 20 and passes through the mounting hole 14 of the sealing ring 10 before connecting with the sealing ring 10. In this embodiment, the drive mechanism 30 can also be a telescopic motor, hydraulic cylinder, or other power source.

[0021] In actual use, such as Figure 3 As shown, the high-temperature tube blank 40 is transferred from the oven to the mold 50 by an external device. After being placed in one mold 50, the two molds 50 (only one side is shown in the figure) quickly close together, cutting the two tube end faces at both ends of the tube blank 40 into the guide sealing seats 20 corresponding to the sealing device, and the high-temperature tube blank 40 are fastened together in the mold 50. The state at this time is as follows. Figure 3 As shown, this is the unsealed state of tube blank 40.

[0022] Then, the telescopic cylinder 31 is activated, and the piston rod 32 moves towards the tube blank 40, pushing the sealing ring 10 to move towards the tube blank 40 simultaneously. The cutting end 11 of the sealing ring 10 quickly cuts into the two end faces of the high-temperature tube blank 40, and cuts into a certain depth in a very short time to form a reliable sealing state. The state at this time is as follows: Figure 5 As shown.

[0023] Then, a high-pressure medium is introduced through the inlet / outlet connector 22. After entering the inlet / outlet chamber 21, the high-pressure medium enters the tube blank 40 through the vent hole 121. Under the action of the high-pressure medium, the tube blank 40 expands and deforms. After expansion, the outer surface of the tube blank 40 fits into the inner cavity of the mold 50, and the product is formed into a semi-finished tube. The state at this point is as follows: Figure 6 As shown. After the product is formed, the high-pressure medium can be discharged again through the inlet and outlet joints 22.

[0024] Then, the telescopic cylinder 31 is activated, and the piston rod 32 moves away from the tube blank 40 and pulls the sealing ring 10 to move and reset towards the tube blank 40 at the same time. The cutting end 11 of the sealing ring 10 quickly separates from the two end faces of the semi-finished tube. At this time, the semi-finished tube can be transferred out of the mold 50 by the external mechanism and the material head with sealing cut marks can be cut off at other stations to obtain the finished product (Note: In the high temperature tube blank blowing process, there are material heads at both ends of the semi-finished product).

[0025] Thus, the tube end face cutting sealing device provided in this application modifies the original method of sealing by attaching a soft sealing device to a high-temperature tube blank, by inserting a sealing body made of a hard material into the end face of the high-temperature tube blank. It utilizes the tight compression, adhesion, and encapsulation between the tube blank material and the surface of the sealing body to achieve sealing, avoiding the production line downtime caused by frequent damage to soft sealing devices and significantly improving the stability of the blowing process. Furthermore: 1. It virtually eliminates production line downtime caused by damage to soft sealing devices: Existing sealing technologies suffer from a high probability of seal failure due to damage. While pipe fitting production lines can replace spare parts within minutes, seal failure often results in the inability to remove semi-finished products, prolonging production line downtime. Replacement of damaged sealing devices on pipeline production lines typically takes 2-3 days, severely impacting production capacity. In contrast, the pipe end face cutting-in sealing device provided in this application withstands a load limit far below the material's inherent performance limit when operating through the sealing ring 10, thus virtually eliminating the possibility of damage.

[0026] 2. Significantly extended maintenance cycle of sealing devices: The longest known maintenance cycle for existing sealing technologies is 14 days. Long-term use can lead to fatigue cracks in sealing devices, which can cause rupture and failure if not replaced promptly. In contrast, the pipe end face cutting-in sealing device provided in this application operates in a normal, stable, and well-lubricated working environment, requiring only periodic inspection and maintenance on an annual basis, eliminating the need for frequent maintenance. This significantly reduces usage and maintenance costs.

[0027] 3. Reduced use of custom seals: Existing sealing technologies use custom-made soft seals, which require mold making and outsourcing to manufacturers, resulting in extremely high costs and long production and delivery cycles. In contrast, the sealing ring 10 of the pipe end face cutting sealing device provided in this application requires almost no replacement. Furthermore, the internal soft sealing components (such as the sealing ring 15) are all mature commercial products, inexpensive but with long replacement cycles, resulting in extremely low overall operating costs.

[0028] like Figures 1-6As shown, in some embodiments, a sealing ring 15 is fitted onto the outer wall of the sealing ring 10, and the outer wall of the sealing ring 15 slides against the inner wall of the guide sealing seat 20. A centering ring 16 is fitted onto the outer wall of the sealing ring 10, and the outer wall of the centering ring 16 slides against the inner wall of the guide sealing seat 20. The centering ring 16 is preferably made of engineering plastic, such as... Figure 4 As shown, this embodiment has four mounting slots 13. The two end mounting slots 13 are used to install the centering ring 16, and the two middle mounting slots 13 are used to install the sealing ring 15. The sealing ring 15 can improve the sealing performance between the outer wall of the sealing ring 10 and the inner wall of the guide sealing seat 20. By having the centering ring 16 directly contact the inner wall of the guide sealing seat 20, the frictional loss between the sealing ring 10 and the inner wall of the guide sealing seat 20 is reduced, thereby increasing the service life of the sealing ring 10.

[0029] Furthermore, unless otherwise explicitly specified or limited, the terms "installation" and "connection" in this application embodiment should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The terms "upper," "lower," "left," "right," "inner," "outer," and "side," etc., are merely for reference to the direction in the accompanying drawings or the usual placement of the product during use. They are only for clearly describing this application and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limitations on this application. The terms "first," "second," etc., are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance; "multiple" refers to at least two. In this application embodiment, the limitations on relative positional relationships such as parallel, perpendicular, and aligned are all relative to the current technological level and are not absolutely strict limitations. Slight deviations are allowed; approximations of parallel, perpendicular, and aligned are all acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 degrees and 10 degrees.

[0030] The above are only some embodiments and implementation methods of this application. The protection scope of this application is not limited thereto. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Any combination of features in different embodiments is also within the protection scope of this application. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application.

Claims

1. A sealing body, characterized in that, Includes a sealing ring (10), one end of which is a cutting end (11) and the other end is a sealing end (12). The sealing end (12) is provided with at least one vent hole (121) that communicates with the interior of the sealing ring (10).

2. A sealing body according to claim 1, characterized in that, The thickness of the cut-in end (11) gradually decreases from the sealing end (12) toward the cut-in end (11).

3. A sealing body according to claim 1, characterized in that, The outer wall of the sealing ring (10) is provided with multiple mounting slots (13) at intervals.

4. A sealing body according to claim 1, characterized in that, The sealing end (12) is provided with a mounting hole (14).

5. A pipe end face cutting sealing device, characterized in that, Including a sealing body as described in any one of claims 1-4, further comprising: Guide sealing seat (20), one end of the guide sealing seat (20) is an open end, the sealing ring (10) is slidably disposed in the guide sealing seat (20) and coaxial with the guide sealing seat (20), and the cutting end (11) is located on the side close to the open end; A drive mechanism (30) is provided on the guide sealing seat (20) and drivenly connected to the sealing ring (10). The drive mechanism (30) is used to drive the sealing ring (10) to slide back and forth along the axial direction of the guide sealing seat (20).

6. The pipe end face cutting sealing device according to claim 5, characterized in that, The other end of the guide sealing seat (20) away from the open end is the closed end. A sealed air intake and exhaust chamber (21) is formed between the inner wall of the guide sealing seat (20), the closed end and the sealing end (12). The guide sealing seat (20) is provided with an air intake and exhaust connector (22) that communicates with the air intake and exhaust chamber (21).

7. A pipe end face cutting sealing device according to claim 6, characterized in that, The outer wall of the sealing ring (10) is fitted with a sealing ring (15), and the outer wall of the sealing ring (15) slides against the inner wall of the guide sealing seat (20).

8. A pipe end face cutting sealing device according to claim 6, characterized in that, The outer wall of the sealing ring (10) is fitted with a centering ring (16), and the outer wall of the centering ring (16) is slidably connected to the inner wall of the guide sealing seat (20).

9. A pipe end face cutting sealing device according to claim 5, characterized in that, The drive mechanism (30) includes a telescopic cylinder (31) disposed on the guide sealing seat (20). The telescopic cylinder (31) has a piston rod (32). One end of the piston rod (32) is inserted into the guide sealing seat (20) and connected to the sealing ring (10).

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