An inner tube vulcanization sealing device and method thereof

Abstract

The present invention discloses an inner tube vulcanization sealing device and its method. The device includes a valve nozzle, an O-ring, a steam pipe, a circulation channel, a dynamic sealing ring, a sealing ring, a solenoid valve and a cylinder; the O-ring is located in a groove on the inner wall of the steam pipe, and the O-ring is a rectangular ring; the O-ring forms a seal in the axial direction of the steam pipe through the pressure difference on both sides of the O-ring and the push of the pneumatic circuit. The valve nozzle includes an anti-corrosion rod and a valve nozzle rubber pad; the arc curvature of the edge of the valve nozzle rubber pad is less than 1, which can effectively reduce the phenomenon of tearing at the mouth edge. When the inner tube is vulcanized and clamped, pressure is applied to the valve nozzle through the die fork, so that the valve nozzle is located in the steam pipe and clamped by the O-ring. The present invention can enhance the sealing performance of the device, increase the inner diameter of the steam inlet pipe, improve the vulcanization and inflation speed of the inner tube and the discharge speed of the steam, and solve the problem of valve nozzle deviation.

Description

Technical Field

[0001] The present invention relates to an inner tube vulcanization process device, and specifically, to an inner tube vulcanization sealing device and method thereof. Background Art

[0002] Inner tube vulcanization is the last step in inner tube production. Inside the inner tube during vulcanization, steam is filled to ensure the basic elements of vulcanization - temperature and pressure. After vulcanization, the steam inside the inner tube is discharged, otherwise, the phenomenon of mold opening and tire bursting will occur. As Figure 1 shown, the existing inflation device includes a valve stem 1, a gasket 2, an air core 3, and a steam inlet pipe 4. The inflation device is provided with a gasket 2 to prevent leakage. The discharge of steam after inner tube vulcanization needs to be realized by connecting the valve stem 1 to a cylinder. When the mold is closed, the mold fork applies pressure to the valve stem 1 to achieve the seal between the valve stem 1 and the mating nozzle. In the existing technology, the inner diameter of the air core 3 of the commonly used valve stem 1, that is, the inner diameter of the steam inlet pipe 4 is only 2.5 mm, which severely restricts the inflation and exhaust speeds, and the vulcanization production efficiency is low. Therefore, when the mold is closed, there is often a problem that the air core 3 is not smoothly docked with the mating nozzle of the inflation device, and the edge part of the valve stem disc will be stressed in the opposite direction of the deflection direction of the valve stem 1, resulting in wrinkling at the stressed part. To ensure the complete and correct docking of the air core and the mating nozzle, it is necessary to slow down the mold closing speed. This will seriously affect the inner tube production efficiency, and also because the mold closing is slow, the inner tube on the lower mold is heated first, and the side of the inner tube close to the lower mold becomes soft and deformed, resulting in transverse folding of the tire body, which seriously affects the inner tube quality.

[0003] Therefore, how to improve the inner tube vulcanization sealing device, enhance the sealing performance, increase the inner diameter of the steam pipe, improve the inner tube vulcanization inflation speed and the steam discharge speed, improve the inner tube quality, and solve the problem of valve stem deflection during inner tube vulcanization is a technical problem to be solved currently.

[0004] In the inner tube vulcanization inflation device described in the patent document (China authorized announcement number CN 203863887 U), by adding a docking part, the inner tube vulcanization inflation speed and the steam discharge speed are improved, and the problem of valve stem deflection is solved. However, it still seals through the air core, does not change the sealing method of the steam pipe in the existing technology, does not redesign the inflation device, does not use static sealing to replace the original plane sealing to cancel the air core, does not have a valve stem that conforms to the inner tube vulcanization inflation and steam discharge, and does not have a connecting arc designed for improving the valve stem. Therefore, the production cost of this device is higher than that of the present application, the maintenance cost is higher than that of the present application, and the sealing performance of this device is not enhanced. Summary of the Invention

[0005] The object of the present invention is to provide an inner tube vulcanization sealing device, which is used to enhance the sealing performance, increase the inner diameter of the steam pipe, improve the vulcanization inflation speed of the inner tube and the discharge speed of steam, and solve the problem of valve stem deviation. The device includes a valve stem, an O-ring, a steam pipe, a flow passage, a one-way valve, a dynamic seal ring, a seal ring, a solenoid valve and a cylinder;

[0006] The seal ring is used to clamp the dynamic seal ring by the push of the cylinder, so that the dynamic seal ring is jointly affected by the seal ring and the pressure difference, and clamps the O-ring;

[0007] The solenoid valve and the cylinder are located outside the steam pipe;

[0008] The O-ring clamps the valve stem in the steam pipe, forming a seal in the axial direction of the steam pipe;

[0009] The O-ring, the dynamic seal ring and the seal ring are located in the groove on the inner wall of the steam pipe;

[0010] The flow passage is located inside the steam pipe wall and is used to make the air flow unidirectionally flow from the one-way valve at the installation end of the steam pipe into the upper side of the groove, forming a pressure difference.

[0011] Preferably, the O-ring is a rectangular ring.

[0012] Preferably, the dynamic seal ring has an annular flange.

[0013] Preferably, the valve stem includes an anti-corrosion rod and a valve stem rubber pad. The anti-corrosion rod connects the valve stem rubber pad and the steam pipe, and the edge arc curvature of the valve stem rubber pad is less than 1.

[0014] Preferably, the O-ring is a double-ring structure.

[0015] The embodiment of the present application provides an inner tube vulcanization sealing method, and the method includes:

[0016] When the inner tube is vulcanized and clamped, pressure is applied to the valve stem through the die fork, so that the valve stem is clamped by the O-ring in the steam pipe. Through the pressure difference on both sides of the O-ring and the push of the pneumatic circuit on the O-ring, a seal is formed in the axial direction of the steam pipe.

[0017] Therefore, through the technical solution of the present application, the improvement of the inner tube vulcanization sealing device can be realized, the inner diameter of the steam pipe can be increased, the vulcanization inflation speed of the inner tube and the discharge speed of steam can be improved, the problem of valve stem deviation can be solved, and even new workers with unskilled operations can start operating immediately, improving the inner tube production efficiency and reducing the enterprise production cost. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Shows a schematic diagram of an existing inflating device;

[0020] Figure 2 Shows a schematic diagram of the sealing device of the present application;

[0021] Figure 3 Shows a force analysis diagram of the rectangular ring of the present application;

[0022] Figure 4 Shows a pneumatic circuit diagram of the present application;

[0023] Figure 5 Shows a schematic diagram of the conical ring of the present application. Detailed implementation manners

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0025] The embodiment of the present application provides an inner tube vulcanization sealing device, which is used to increase the inner diameter of the steam pipe, improve the vulcanization and inflation speed of the inner tube and the discharge speed of steam, and solve the problem of valve nozzle deviation.

[0026] As Figure 2 shown, the device is a redesigned device for the inner tube vulcanization and inflation device in the prior art, and includes a valve nozzle 5, an O-ring 6, a steam pipe 7, a flow passage 15, a check valve 16, a dynamic seal ring 14, a sealing ring 18, a solenoid valve 20 and a cylinder 21.

[0027] The O-ring 6 is located in the groove on the inner wall of the steam pipe 7, and this groove is located directly below the mounting shaft end 8. There is also a dynamic seal ring 14 and a sealing ring 18 in this groove. The enlarged view A of this groove is as Figure 3 shown.

[0028] There are at least 2 O-rings 6, preferably 2 to 3.

[0029] The O-ring 6 is a rectangular ring, as Figure 3As shown, the cross-section of the rectangular ring is rectangular. It has a simple structure and is easy to manufacture, and can be mass-produced to reduce production costs.

[0030] The steam pipe 7 is provided with an inlet angle at the installation shaft end 8, which is convenient for the installation and replacement of the O-ring.

[0031] Before the inner tube is vulcanized, the mold fork 9 applies pressure to one end of the valve nozzle 5, so that the other end of the valve nozzle 5 is clamped by the O-ring 6. However, there are still gaps between the valve nozzle 5 and the steam pipe 7 and between the valve nozzle 5 and the O-ring 6 at this time, and the purpose of sealing cannot be achieved. Therefore, it is necessary for the O-ring to be closely attached to the valve nozzle 5 through the pressure difference on both sides of the O-ring and the push of the pneumatic circuit, so that the air flow in the gap between the valve nozzle 5 and the steam pipe 7 cannot pass through the gap between the valve nozzle 5 and 2 to 3 O-rings 6 at all.

[0032] The sealing ring is used to clamp the dynamic sealing ring through the push of the cylinder, so that the dynamic sealing ring is jointly acted on by the sealing ring and the air pressure difference to clamp the O-ring, as Figure 3 shown, including:

[0033] During the vulcanization process of the inner tube, the force analysis of the O-ring is as Figure 3 shown. F2 is the pressure received by the O-ring, the pressing force F1 is the acting force of the O-ring on the valve nozzle 5, the first sealing surface 11 is the sealing surface between the valve nozzle 5 and the steam pipe 7, that is, the radial sealing surface of the steam pipe 7, and the second sealing surface 10 is the axial sealing surface of the steam pipe 7 above and below the O-ring. Through the action of F1 and F2, the first sealing surface 11 and the second sealing surface 10 are sealed to form the axial sealing of the steam pipe 7.

[0034] The downward force in the figure is generated by the pressure of the high-pressure gas formed by the air pressure difference on both sides of the O-ring, that is, the air flow on the side close to the installation end 8 is much greater than that on the other side, that is, the sealed end. However, only through the gap between the valve nozzle 5 and the steam pipe 7, it is not enough to make the air flow on the installation end 8 side form high-pressure gas. Therefore, the flow channel 15 and the one-way valve 16 are added, so that the air flow flows unidirectionally into the installation end 8 side through the one-way valve 16 and the flow channel 15 to form high-pressure gas, generating a downward pressure to seal the second sealing surface 10.

[0035] The flow channel 15 also includes a communication channel between the grooves on the outside of the two O-rings.

[0036] The clamping force F1 in the figure is generated by the pressure of the high-pressure gas formed by the pressure difference and the push of the pneumatic circuit. Since the dynamic seal ring 14 has an annular flange, the airflow passes through the gap between the valve and the steam pipe, and the airflow from the one-way valve 16 and the flow channel to the outside of the O-ring 6 flows into the annular channel 17, forming high-pressure gas and generating partial radial clamping force. However, this radial clamping force is not enough to seal between the O-ring 6 and the steam pipe 7. Therefore, the sealing ring 18, the solenoid valve and the cylinder are added to increase the radial clamping force, such as Figure 4 As shown, specifically:

[0037] When the solenoid valve 20 is energized, the gas path is opened, so that the air pressure generated by the air source device flows into the cylinder 21, so that the cylinder 21 has a certain pressure and remains stable.

[0038] The cylinder 21 enters the outside of the sealing ring 18 through the hole on the wall of the steam pipe 7 to generate thrust.

[0039] The solenoid valve 20 may be an internally controlled internally leaking sequence valve, which can prevent a large error in the thrust generated by the cylinder.

[0040] Therefore, the cylinder 21 can smoothly push the sealing ring 18, clamp the dynamic sealing ring 14 and the O-ring 6, and make the first sealing surface 11 sealed.

[0041] Therefore, the O-ring is a static seal, and the inner diameter of the steam pipe 7 can be equivalent to the inner diameter of the valve 5. In this embodiment, it is specifically 4.2 mm, and the inner diameter of the O-ring is 4.45 mm according to the first-level repair size. After each replacement and maintenance, the inner diameter of the O-ring is increased by 0.25 mm according to the repair size.

[0042] During the vulcanization process of the inner tube, the valve 5 is connected to the cylinder and the steam pipe 7 is fixed in the vulcanization mold.

[0043] A seal is formed between the valve 5 and the steam pipe 7.

[0044] In another embodiment of the present application, the O-ring is a conical ring to reduce the impact on the groove of the steam pipe. Figure 5 As shown, specifically:

[0045] The cross section of the conical ring 6 is conical, and a conical surface of 0.5 to 1.5 degrees is machined on its outer circumferential working surface. Figure 5 shown.

[0046] The cross section of the conical ring 6 reduces the contact surface between the ring and the steam pipe 7 , increases the surface contact pressure, and reduces the impact on the groove of the steam pipe 7 .

[0047] During the vulcanization process of the inner tube, the oil wedge effect of the conical surface of the conical surface ring 6 can allow a small amount of sulfide and impurities generated after vulcanization to pass through the oil film, thereby reducing the impact and wear on the groove of the steam pipe 7.

[0048] The valve 6 comprises an anti-corrosion rod 12 and a valve rubber pad 13, wherein the anti-corrosion rod connects the valve rubber pad and the steam pipe.

[0049] The edge arc curvature of the valve rubber pad 13 is less than 1, so the edge of the valve rubber pad 13 is smooth. When the inner tube is inflated or deflated, the forces in the four positive force directions of the edge of the valve rubber pad 13 are dispersed, and the stress concentration phenomenon is greatly reduced compared with a circular or elliptical rubber pad.

[0050] Therefore, the valve rubber pad 13 can effectively reduce the tearing phenomenon at the valve edge and increase the vulcanization and inflation speed of the inner tube and the exhaust speed of steam.

[0051] The O-ring may also be a double-ring structure.

[0052] Therefore, the inner diameter of the steam pipe of the device of the present application is 4.2 mm, which is much larger than the inner diameter of the steam pipe of 2.5 mm in the prior art. Combined with the valve rubber pad, the vulcanization and inflation speed of the inner tube and the steam discharge speed are improved, and new workers who are not skilled in operation can also start operating immediately, thereby improving production efficiency by more than 50%.

[0053] Therefore, the inner diameter of the steam pipe of the device of the present application can be consistent with the inner diameter of the valve stem, which solves the problem in the prior art that the edge of the valve stem disc will be subjected to force in the opposite direction of the valve stem's deviation, resulting in wrinkles at the force-bearing point due to inconsistent inner diameters and improper docking, and enhances the sealing of the device.

[0054] The present application provides a method for vulcanizing and sealing an inner tube, the method comprising:

[0055] The fixed position is the groove of the steam inlet pipe 7.

[0056] When the inner tube is vulcanized and molded, pressure is applied to the valve stem through the mold fork, so that the valve stem is located in the steam pipe and clamped by the O-ring. The air pressure difference on both sides of the O-ring and the push of the pneumatic circuit on the O-ring form an axial seal on the steam pipe.

[0057] Before the inner tube is vulcanized, the valve 5 is connected to the cylinder, and the steam inlet pipe 7 is fixed in the vulcanization mold.

[0058] During the inner tube vulcanization process, the cylinder is filled with steam through the device of the present application.

[0059] After the inner tube is vulcanized, the cylinder discharges steam through the device of the present application.

[0060] Therefore, the method of the present application can achieve sealing of the inner tube before and after vulcanization, enhance the sealing performance, increase the vulcanization inflation speed of the inner tube and the steam discharge speed, improve production efficiency, and solve the technical problem in the prior art that due to inconsistent inner diameters and improper docking, the edge of the valve stem disc is subjected to force in the opposite direction of the valve stem deviation, resulting in wrinkles at the force-bearing location.

[0061] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. An inner tube vulcanization sealing device, comprising: a valve nozzle, an O-ring, a steam pipe, a circulation channel, a one-way valve, a dynamic seal ring, a sealing ring, a solenoid valve and a cylinder; the sealing ring is used to clamp the dynamic seal ring by the push of the cylinder, so that the dynamic seal ring is jointly acted on by the sealing ring and the air pressure difference to clamp the O-ring; the solenoid valve and the cylinder are located outside the steam pipe; the O-ring clamps the valve nozzle in the steam pipe to form a seal in the axial direction of the steam pipe; the O-ring, the dynamic seal ring and the sealing ring are located in the groove on the inner wall of the steam pipe; the circulation channel is located inside the steam pipe wall and is used to make the air flow unidirectionally flow from the one-way valve at the installation end of the steam pipe into the upper side of the groove to form an air pressure difference.

2. The device according to claim 1, wherein the O-ring is a rectangular ring.

3. The device according to claim 1, wherein the dynamic seal ring has an annular flange.

4. The device according to claim 1, wherein the sealing ring is used to clamp the dynamic seal ring by the push of the cylinder, comprising: the solenoid valve enables the cylinder to push the sealing ring through the hole on the steam pipe to clamp the dynamic seal ring.

5. The device according to claim 1, wherein the valve nozzle comprising: an anti-corrosion rod and a valve nozzle rubber pad; the anti-corrosion rod connects the valve nozzle rubber pad and the steam pipe; the edge arc curvature of the valve nozzle rubber pad is less than 1.

6. The device according to claim 1, wherein the O-ring is a double-ring structure.

7. A sealing method for the inner tube vulcanization sealing device according to any one of claims 1 to 6, comprising: when the inner tube is vulcanized and the mold is closed, pressure is applied to the valve nozzle through the mold fork, so that the valve nozzle is located in the steam pipe and is clamped by the O-ring, and through the air pressure difference on both sides of the O-ring and the push of the pneumatic circuit on the O-ring, a seal is formed in the axial direction of the steam pipe.

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