A prefabricated baseball-shaped sealed wire drawing furnace device

Abstract

The present invention is applicable to the technical field of optical fiber production equipment, and provides a prefabricated baseball-shaped sealed wire drawing furnace device, including a wire drawing furnace body, a heating element is arranged in the wire drawing furnace body, an upper cover plate is arranged on the top of the wire drawing furnace body, a sealing sleeve is installed above the upper cover plate, a prefabricated rod channel is opened from the sealing sleeve to the wire drawing furnace body, and the upper cover plate is provided with a spherical sealing net with one or more layers of ring-shaped nets in the sealing sleeve. The spherical sealing net of the present invention is reusable, and the spherical sealing net is multi-layered, and the sealing ball has a tendency to move into the channel by relying on the gravity of the sealing ball, which can ensure that the inner ring sealing ball is closely connected with the prefabricated rod, and the gap is small, which is not easy to cause oxidation of the wire drawing furnace; and during the wire drawing process, the sealing ball and the contact surface of the prefabricated rod can slide relative to each other, which will not damage the surface of the prefabricated rod and is not easy to introduce impurities. It avoids the problem of the fragility of the sealing parts in the prior art and the high cost caused by the frequent replacement of the sealing filler.

Description

Technical Field

[0001] The invention belongs to the technical field of optical fiber production equipment, and in particular relates to a prefabricated baseball-shaped sealed wire drawing furnace device. Background Art

[0002] Optical fiber is formed by heating the formed optical fiber preform rod to the softening temperature of quartz in a drawing furnace and drawing it into a wire. The drawing furnace plays an important role in the entire drawing process. The graphite heating element is heated by induction or resistance in the drawing furnace to soften the preform rod. The temperature of the graphite parts in the drawing furnace is relatively high. In order to ensure that the graphite products are not oxidized and to ensure the stability of the temperature field of the drawing furnace, inert gas is filled in the drawing furnace. In order to prevent outside air from entering the drawing furnace and causing oxidation in the furnace, a sealing device needs to be installed at the upper mouth of the drawing furnace to ensure the quality and strength of the optical fiber.

[0003] With the development of optical fiber drawing technology, there are many ways to seal the upper part of the drawing furnace. However, most of the current technologies use quartz or graphite soft felt products placed on the upper mouth of the drawing furnace to fill the gap between the drawing furnace and the preform rod to seal. However, when replacing the preform rod or cleaning the drawing furnace, the upper seal needs to be replaced or frequently disassembled. The deformation of quartz or graphite soft felt deteriorates due to high temperature, and the container is quartz and the graphite product itself is fragile. Frequent disassembly will cause damage to the seal, thereby greatly increasing the drawing cost. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a prefabricated baseball-shaped sealed wire drawing furnace device, aiming to solve the technical problems of short service life and inconvenient disassembly and assembly of the sealing parts of the existing wire drawing furnace.

[0005] The present invention adopts the following technical solution:

[0006] The prefabricated baseball-shaped sealed wire drawing furnace device comprises a wire drawing furnace body, a heating element is arranged in the wire drawing furnace body, an upper cover plate is arranged on the top of the wire drawing furnace body, a sealing sleeve is installed above the upper cover plate, a prefabricated rod channel is opened from the sealing sleeve to the wire drawing furnace body, and the upper cover plate is provided with a spherical sealing net with one or more layers of ring-forming nets in the sealing sleeve.

[0007] Furthermore, the spherical sealing net includes multiple circles of high temperature resistant sealing balls, and the sealing balls in the same circle and / or adjacent circles are connected by high temperature resistant connecting lines.

[0008] Furthermore, in the spherical sealing net, the inner ring sealing balls of at least one layer of the spherical sealing net enter into the preformed rod channel of the upper cover plate, have a tendency to move into the channel and contact the preformed rod in the channel.

[0009] Furthermore, the spherical sealing nets are stacked in multiple layers, and the sealing balls of adjacent layers of spherical sealing nets are arranged in a staggered manner.

[0010] Furthermore, the side wall of the sealing sleeve is provided with an inert gas inlet pipe, and the upper cover plate is connected with a cooling circulation water channel.

[0011] Furthermore, the top of the upper cover plate is provided with a groove, and the sealing sleeve is sealingly installed in the groove.

[0012] The beneficial effects of the present invention are:

[0013] First, the spherical sealing net of the present invention is reusable. During the wire drawing process, the sealing ball and the contact surface of the preform rod can slide relative to each other, which will not damage the surface of the preform rod and is not easy to introduce impurities. Second, the spherical sealing net of the present invention is multi-layered. Relying on the gravity of the sealing ball, the sealing ball has a tendency to move into the channel, which can ensure that the inner ring sealing ball is in close contact with the preform rod, and the gap is small, which is not easy to cause oxidation in the wire drawing furnace. Third, the diameter of the preform rod changes during the wire drawing process, and the sealing ball can still be in close contact with the preform rod, which can avoid the phenomenon of gas blowby oxidation caused by the change in the diameter of the preform rod, extend the service life of the graphite parts in the wire drawing furnace, and reduce the production cost. Fourth, the wire drawing furnace sealing sleeve of the present invention is integrated with the wire drawing furnace, detachable, does not need to add a customized quartz gas seal, is not easy to be damaged, and can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a structural diagram of a prefabricated baseball-shaped sealed wire drawing furnace device provided in an embodiment of the present invention;

[0015] Figure 2 is a cross-sectional view of a prefabricated baseball-shaped sealed wire drawing furnace device provided by an embodiment of the present invention;

[0016] Figure 3 is a structural diagram of an upper cover plate provided by an embodiment of the present invention;

[0017] Figure 4 is a structural diagram of a spherical sealing net provided by an embodiment of the present invention;

[0018] Figure 5 It is a partial structural diagram of the spherical sealing net;

[0019] Figure 6 It is a schematic diagram of the superposition of two adjacent layers of spherical sealing nets. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] In order to illustrate the technical solution of the present invention, a specific embodiment is provided below for illustration.

[0022] Figure 1 The structure of a prefabricated baseball-shaped sealed wire drawing furnace device provided in an embodiment of the present invention is shown. For the sake of convenience of explanation, only the parts related to the embodiment of the present invention are shown.

[0023] like Figure 1-3 As shown, the prefabricated baseball-shaped sealed wire drawing furnace device provided in this embodiment includes a wire drawing furnace body 6, a heating element 5 is arranged inside the wire drawing furnace body 6, an upper cover plate 4 is provided on the top of the wire drawing furnace body 6, a sealing sleeve 1 is installed above the upper cover plate 4, a prefabricated rod channel is opened from the sealing sleeve 1 to the wire drawing furnace body 6, and the upper cover plate 4 and the sealing sleeve 1 are provided with a spherical sealing net 3 with one or more layers of ring-forming nets.

[0024] As a specific structure, the top of the upper cover plate 4 has a groove 42, and the sealing sleeve 1 is sealed and installed in the groove 42. In this structure, the integrated groove on the top of the upper cover plate is placed with one or more layers of high-temperature resistant spherical sealing nets, preferably multiple layers, and 5 layers are shown in the figure. The spherical sealing net is a ring-shaped spherical mesh structure, and the sealing is maintained by superimposing the spherical mesh structure. The spherical sealing net is a high-temperature resistant sealing material and can be reused. The high-temperature resistant spherical sealing net is stored in an integrated sealing sleeve on the upper part of the wire drawing furnace, and protective gas is introduced into the sealing sleeve. In the figure, the side wall of the sealing sleeve 1 has an inert gas inlet pipe 2, and protective gas is introduced to keep the air isolated, so as to ensure that the external gas cannot enter the heating cavity of the wire drawing furnace, affect the temperature field of the wire drawing furnace and thus affect the wire drawing quality. In addition, the upper cover plate 4 is connected to a cooling circulation water channel 41, which plays a cooling role.

[0025] In this embodiment, the sealing sleeve is a metal structure, with a round hole on the top as a preform passage, the diameter of the round hole is slightly larger than the diameter of the preform, and the preform can move up and down in it. The lower part of the sealing sleeve is an open structure, which can be placed in the annular groove opened on the upper cover of the wire drawing furnace, and its height can accommodate multiple layers of spherical sealing nets.

[0026] The material of the spherical sealing net is high temperature resistant material. The inner diameter of the spherical sealing net is slightly larger than the gap between the preform rod and the furnace mouth, so that the preform rod can penetrate the center of the spherical sealing net. The spherical sealing material is made of high temperature resistant material and threaded into a mesh. The woven ring mesh structure can be placed in the groove of the upper cover plate of the wire drawing furnace, and the spherical sealing nets can be staggered and stacked.

[0027] The working process of this device is as follows:

[0028] First, hang the preform rod on the lifting platform of the drawing tower and raise it above the sealing sleeve. Place the spherical sealing net made of high-temperature resistant spherical material in the groove of the upper cover of the drawing furnace. To ensure sealing, stagger and stack more than five layers. Cover the sealing sleeve on the drawing furnace. The preform rod passes through the round hole on the top of the sealing barrel until it reaches the heating cavity of the heating element. During the drawing process, inert gas is filled in the upper sealing sleeve until the drawing is completed.

[0029] As a specific structure of the spherical sealing net, Figure 4-6 As shown, the spherical sealing net 3 includes multiple circles of high temperature resistant sealing balls 31, and the sealing balls in the same circle and / or the sealing balls in adjacent circles are connected by high temperature resistant connecting wires 32. The sealing balls in the same circle are connected by connecting wires in the following manner: the connecting wires directly pass through the ball centers of the sealing balls in the same circle to form a whole; the sealing balls in adjacent circles are connected by connecting wires in the following manner: the adjacent sealing balls in adjacent circles are connected by connecting wires, or two adjacent circles are connected by connecting wires.

[0030] In this structure, the sealing balls in the same circle and the sealing balls in the adjacent circle are connected, so that the entire spherical sealing net forms a whole. The spherical sealing net is stacked and placed in multiple layers, with more than five layers stacked. The sealing balls of adjacent layers of spherical sealing nets are arranged in a staggered manner, that is, the sealing balls of the upper layer are located in the concave area between the two adjacent circles of sealing balls in the lower layer, so as to ensure the airtightness of the wire drawing furnace.

[0031] In the spherical sealing net, at least one layer of the inner ring sealing ball of the spherical sealing net enters the preformed rod channel range of the upper cover plate, and has a tendency to move into the channel and contact the preformed rod in the channel. During wire drawing, the preformed rod passes through the spherical sealing net made of multiple layers of high temperature resistant materials. The contact surface of the sealing ball in contact with the preformed rod and the preformed rod is very smooth, and can even rotate with the preformed rod, which can avoid scratching the preformed rod. The preformed rod directly reaches the heating body of the wire drawing furnace. As the wire drawing proceeds, the preformed rod gradually becomes thinner. On the one hand, the preformed rod will carry the sealing ball to the central channel of the upper cover plate and tighten inward and downward. On the other hand, the spherical sealing net of the thinned preformed rod will also gradually press down and tighten the central channel of the upper cover plate with gravity, maintaining the tendency to move into the channel. The sealing ball can always be in close contact with the surface of the preformed rod, providing an excellent sealing effect.

[0032] In summary, the structural design of the device of the present invention can ensure the airtightness of the upper opening of the wire drawing furnace and the quality of wire drawing, while improving the shortcomings of the prior art such as the fragility of the seals and the high cost caused by the frequent replacement of the sealing fillers.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A prefabricated baseball-shaped sealed wire drawing furnace device, comprising a wire drawing furnace body, a heating element is arranged in the wire drawing furnace body, an upper cover plate is arranged on the top of the wire drawing furnace body, a sealing sleeve is installed above the upper cover plate, and a prefabricated rod channel is opened from the sealing sleeve to the wire drawing furnace body, characterized in that: The upper cover plate is provided with one or more layers of spherical sealing nets in the form of a ring-shaped net in the sealing sleeve; the spherical sealing net includes multiple circles of high-temperature resistant sealing balls, and the sealing balls in the same circle and / or adjacent circles are connected by high-temperature resistant connecting lines; in the spherical sealing net, at least one layer of the inner circle sealing balls of the spherical sealing net enters the preform rod channel range of the upper cover plate, has a tendency to move into the channel and contacts the preform rods in the channel; the spherical sealing nets are stacked and placed in multiple layers, and the sealing balls of adjacent layers of the spherical sealing nets are arranged in a staggered manner.

2. The prefabricated baseball-shaped sealed wire drawing furnace device according to claim 1, characterized in that: The side wall of the sealing sleeve is provided with an inert gas inlet pipe, and the upper cover plate is connected with a cooling circulation water channel.

3. The prefabricated baseball-shaped sealed wire drawing furnace device according to claim 2, characterized in that: The top of the upper cover plate is provided with a groove, and the sealing sleeve is sealingly installed in the groove.

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