Optical fiber original tail handle wire drawing device

Abstract

The utility model relates to an optical fiber original tail handle wire drawing device, and relates to the field of optical fiber production technology, the optical fiber original tail handle wire drawing device comprises a hanging rod assembly, a wire drawing furnace, a first metal sleeve and a second metal sleeve, the second metal sleeve is sleeved with the first metal sleeve and abuts against the first metal sleeve, and the first metal sleeve is in sliding connection with the second metal sleeve; the hanging rod assembly is used for installing an original tail handle and lifting the original tail handle, and the original tail handle is located in the second metal sleeve and enters the wire drawing furnace from the second metal sleeve for wire drawing. By designing the sleeve made of the metal material, the stability of the structure is enhanced, the butt joint deviation is reduced, and the working stability is improved; and due to the design of the metal sleeve, the original tail handle can be completely pulled, the loss of the original tail handle is reduced, and the problem of high loss of an originally used quartz sleeve can be solved, so that the production cost is reduced.

Description

Technical Field

[0001] This application relates to the field of optical fiber production technology, and particularly to an optical fiber original tailstock wire drawing device. Background Art

[0002] The production process of optical fibers depends on the melting and wire drawing process of optical fiber preforms. Usually, an original tailstock is retained at one end of the optical fiber preform. The traditional treatment method is to cut off the invalid part at this end to ensure the smooth progress of subsequent wire drawing. However, with the increasing emphasis on cost control in the optical fiber market, major optical fiber manufacturers have begun to explore the possibility of directly using the original tailstock for wire drawing to reduce material waste and production costs.

[0003] Although using the original tailstock for wire drawing has potential economic advantages, it also introduces a series of technical challenges. Currently, existing wire drawing devices mainly include a furnace mouth quartz bowl, a T-shaped quartz sleeve, and an H-shaped quartz sleeve provided on the furnace mouth quartz bowl. During operation, the original tailstock is lifted and lowered by a crane and enters the furnace mouth quartz bowl for wire drawing. However, due to the short length of the original tailstock, abnormal phenomena such as wire diameter fluctuations, collimation mutations, and gas cross-flow often occur when the T-shaped quartz sleeve is docked with the H-shaped quartz sleeve during production. These problems may not only cause defects such as air leakage, oxidation, and furnace burnout, but also affect the strength and stability of the final optical fiber.

[0004] During the wire drawing process, the original tailstock sometimes gets stuck, resulting in the inability to complete the wire drawing operation. At the same time, the wobbling of collimation and the deviation during docking reduce the consistency of the optical fiber, further increasing the consumption of spare parts and production costs. In addition, the quartz sleeve, as a consumable, cannot be reused in production, further increasing the burden of manufacturing costs. Utility Model Content

[0005] In order to solve the problems of the tailstock getting stuck during the tailstock wire drawing process and the high material consumption cost, this application provides an optical fiber original tailstock wire drawing device.

[0006] The optical fiber original tailstock wire drawing device provided by this application adopts the following technical solutions:

[0007] An optical fiber original tailstock wire drawing device includes a rod hanging assembly, a wire drawing furnace, a first metal sleeve, and a second metal sleeve. The first metal sleeve is fixed on the wire drawing furnace. The second metal sleeve is sleeved inside the first metal sleeve and abuts against the first metal sleeve. The first metal sleeve and the second metal sleeve are slidably connected. The rod hanging assembly is used for installing the original tailstock and lifting and lowering the original tailstock. The original tailstock is located inside the second metal sleeve and enters the wire drawing furnace from the second metal sleeve for wire drawing.

[0008] By adopting the above technical solution, during operation, first, the second metal sleeve is butt - jointed and installed with the first metal sleeve. The first metal sleeve is fixed on the wire - drawing furnace, while the second metal sleeve is sleeved inside the first metal sleeve and abuts against it to achieve a sliding connection. Then, through the hanging rod assembly, the original tail - stock is suspended and lifted. The original tail - stock is located inside the second metal sleeve and enters the wire - drawing furnace from it. During the heating process in the wire - drawing furnace, the original tail - stock is melted and wire - drawing is carried out. The sliding connection of the metal sleeve allows the tail - stock to smoothly enter the furnace, ensuring the stability of the wire - drawing operation. This application provides stronger structural stability by designing a sleeve made of metal, reduces the possible deviation during butt - jointing, guarantees the accuracy of optical fiber wire - drawing. The design of the sliding connection makes the original tail - stock not easy to get stuck during the wire - drawing process, thus reducing the downtime in production and improving the efficiency. The stable butt - joint and smooth wire - drawing process improve the diameter consistency of the optical fiber, ensuring the quality of the final product. At the same time, the structural design of the metal sleeve can better avoid gas leakage, reducing the risk of oxidation and other defects. And through optimized design, the loss of the tail - stock and the quartz sleeve is reduced, thereby reducing the production cost. The durability of the metal sleeve means that it can be used multiple times, reducing the replacement frequency and cost during long - term operation.

[0009] In a specific feasible implementation, the hanging rod assembly includes a hanging rod platform and a metal leading rod fixed on the hanging rod platform. One end of the metal leading rod away from the hanging rod platform is inserted into the second metal sleeve and connected to the original tail - stock, and the hanging rod platform drives the metal leading rod to lift and lower.

[0010] By adopting the above technical solution, the design of the metal leading rod allows accurate lifting and lowering, effectively controlling the entry and exit of the original tail - stock, improving the stability and efficiency of wire - drawing. And the structure of the metal leading rod simplifies the maintenance process, facilitating quick replacement or adjustment. The optimized connection method reduces the risk of the original tail - stock getting stuck, ensuring the continuity and efficiency of the production process.

[0011] In a specific feasible implementation, it further includes a seal. Between the metal leading rod and the second metal sleeve, and between the first metal sleeve and the second metal sleeve, they are sealed by the seal.

[0012] By adopting the above technical solution, the design of the seal effectively prevents gas leakage, ensures the pressure stability inside the system, while reducing the intrusion of external pollutants, protecting the normal operation of the equipment. This sealing mechanism not only improves the safety of the equipment, but also extends the service life, reduces the maintenance frequency, thus significantly improving the overall working efficiency and reliability.

[0013] In a specific feasible implementation, the seal is a polytetrafluoroethylene paper gasket.

[0014] By adopting the above technical solutions, the PTFE paper gasket can withstand high-temperature environments, maintain good sealing performance, ensure reliability under extreme conditions, effectively prevent gas and liquid leakage, improve the overall sealing performance of the system. The PTFE paper gasket also has excellent corrosion resistance to a variety of chemical substances, is suitable for various industrial applications, and the flexibility of the PTFE paper gasket makes it easy to install and replace, reducing the maintenance difficulty.

[0015] In a specific feasible implementation, the seal is a quartz wool strip.

[0016] By adopting the above technical solutions, the quartz wool strip can withstand extremely high temperatures, is suitable for sealing applications in high-temperature environments. The quartz wool strip has excellent elasticity and compressibility, can effectively fill gaps to ensure the sealing effect. The quartz wool strip also has strong resistance to a variety of chemical substances, extending its service life. And the softness of the quartz wool strip makes its installation simple, facilitating maintenance and replacement.

[0017] In a specific feasible implementation, the first metal sleeve, the second metal sleeve, and the wire drawing furnace are provided with a cooling component.

[0018] By adopting the above technical solutions, through effective cooling, the thermal stress on the metal sleeve and the wire drawing furnace caused by high temperature is reduced, extending the service life of the equipment. Stable temperature control helps to maintain the material properties during the optical fiber drawing process, thus ensuring the quality consistency and performance of the final product. And the cooling component reduces the risk of equipment overheating, enhances operation safety, reduces the downtime caused by equipment overheating, and thus improves production efficiency.

[0019] In a specific feasible implementation, it further includes a limit clamp, and the limit clamp is sleeved on the outer wall of the second metal sleeve and is slidably connected thereto; when the cooling component on the second metal sleeve contacts the limit clamp, the second metal sleeve stops moving.

[0020] By adopting the above technical solutions, the limit clamp effectively limits the movement range of the second metal sleeve, reduces the risk of mechanical damage caused by over-travel, ensures that the system automatically stops at the limit position, prevents the second metal sleeve from entering the wire drawing furnace excessively and being melted, thereby enhancing the safety of the operation process and reducing the possibility of accidents.

[0021] In a specific feasible implementation, the cooling component is a circulating water cooling component.

[0022] By adopting the above technical solutions, the circulating water cooling component can continuously and rapidly remove the heat generated by the equipment, ensure that the working temperature is maintained within a safe range, improve the overall performance of the system. Through continuous circulation, the cooling component can effectively prevent temperature fluctuations and reduce the risk of material deformation and damage caused by temperature changes. Moreover, compared with other cooling methods, the circulating water system usually has lower energy consumption, which helps to reduce production costs and at the same time reduces the negative impact on the environment.

[0023] In a specific feasible embodiment, a metal ring is provided at the furnace mouth of the wire drawing furnace, and the first metal sleeve is sleeved within the metal ring and sealed with the metal ring.

[0024] By adopting the above technical solutions, the sealed connection between the metal ring and the first metal sleeve effectively prevents the leakage of gas or liquid, ensures the stability of the internal environment of the wire drawing furnace, and the metal ring provides additional supporting force, enhancing the structural stability and resisting vibration and pressure changes during operation.

[0025] In a specific feasible embodiment, it further includes a hanging component, which is used for hanging and lifting the second metal sleeve so that the second metal sleeve is inserted into the first metal sleeve for docking with it.

[0026] By adopting the above technical solutions, the hanging component makes the lifting of the second metal sleeve more flexible, facilitating adjustment and maintenance, and ensures the stable docking of the second metal sleeve and the first metal sleeve, improving the sealing effect and overall stability.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. The present application enhances the structural stability by designing sleeves made of metal, reduces the docking deviation, ensures the accuracy of optical fiber drawing and the consistency of wire diameter, reduces the production downtime, and improves the efficiency. Moreover, the metal structure can effectively avoid gas leakage, reduce the risk of oxidation and defects. In addition, compared with the prior art, the optimized design of the metal sleeve can ensure that the original tail stock is completely drawn, reduce the loss of the original tail stock, and solve the problem of high loss of the previously used quartz sleeve, thereby reducing the production cost;

[0029] 2. By using the design of the limit clamp, the movement range of the second metal sleeve is effectively limited, reducing the risk of mechanical damage caused by over-travel, ensuring that the system automatically stops at the limit position, preventing the second metal sleeve from entering the wire drawing furnace too much and being melted, thereby enhancing the safety of the operation process and reducing the possibility of accidents;

[0030] 3. The design of the seal effectively prevents gas leakage, ensures the pressure stability inside the system, reduces the intrusion of external pollutants at the same time, and protects the normal operation of the equipment. This sealing mechanism not only improves the safety of the equipment, but also extends its service life, reduces the maintenance frequency, and thus significantly improves the overall working efficiency and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of the wire drawing device in the embodiment of the present application.

[0032] Description of the reference numerals: 1. Wire drawing furnace; 11. Metal ring; 2. First metal sleeve; 3. Second metal sleeve; 4. Original tail handle; 5. Hanging rod assembly; 51. Hanging rod platform; 52. Metal guiding rod; 6. Seal; 7. Cooling assembly; 71. Water inlet pipe; 72. Water outlet pipe; 8. Limit clamp. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The following will Figure 1 further describe the present application in detail with reference to the attached drawings.

[0034] The embodiment of the present application discloses an optical fiber original tail handle wire drawing device. The wire drawing device includes a wire drawing furnace 1, a first metal sleeve 2 and a second metal sleeve 3. The first metal sleeve 2 is fixed on the wire drawing furnace 1. A metal ring 11 is provided at the furnace mouth of the wire drawing furnace 1. The first metal sleeve 2 is sleeved in the metal ring 11 and forms a metal seal with the metal ring 11; thus effectively preventing the gas leakage in the wire drawing furnace 1, ensuring the stability of the internal environment of the wire drawing furnace 1, and the metal ring 11 provides additional supporting force, enhancing the structural stability and resisting the vibration and pressure changes during the operation;

[0035] The second metal sleeve 3 is sleeved in the first metal sleeve 2 and abuts against the first metal sleeve 2. The first metal sleeve 2 and the second metal sleeve 3 are slidably connected, and a metal seal is formed between the first metal sleeve 2 and the second metal sleeve 3; thus effectively preventing the gas leakage in the first metal sleeve 2 and the second metal sleeve 3, and further ensuring the stability of the wire drawing working environment;

[0036] The wire drawing device further includes a hanging rod assembly 5. The hanging rod assembly 5 is used for installing the original tail handle 4 and lifting and lowering the original tail handle 4. The original tail handle 4 is located in the second metal sleeve 3 and enters the wire drawing furnace 1 from the second metal sleeve 3 for wire drawing;

[0037] The hanging rod assembly 5 includes a hanging rod platform 51 and a metal guide rod 52 fixed on the hanging rod platform 51. One end of the metal guide rod 52 away from the hanging rod platform 51 is inserted into the second metal sleeve 3 and connected to the original tail stock 4. The hanging rod platform 51 drives the metal guide rod 52 to lift and lower, thereby driving the original tail stock 4 to continuously enter the wire drawing furnace 1 for wire drawing; the design of the hanging rod platform 51 and the metal guide rod 52 allows for the accurate lifting and lowering of the original tail stock 4, effectively controlling the entry and exit of the original tail stock 4, improving the stability and efficiency of wire drawing. Moreover, the structure of the metal guide rod 52 simplifies the maintenance process, facilitates quick replacement or adjustment, and the optimized connection method reduces the risk of the original tail stock 4 getting stuck, ensuring the continuity and efficiency of the production process;

[0038] The wire drawing device further includes a hanging component, which is used to hang and lift the second metal sleeve 3 so that the second metal sleeve 3 is inserted into and docked with the first metal sleeve 2, and drives the second metal sleeve 3 to slide within the first metal sleeve 2; the hanging component can flexibly adjust the height of the second metal sleeve 3 to enable it to smoothly insert into the first metal sleeve 2, ensuring the smoothness and precision of the docking process. After the docking is completed, the hanging component also supports the sliding of the second metal sleeve 3 within the first metal sleeve 2, ensuring stability and efficiency during the wire drawing process. Moreover, the stability of the hanging component improves the operating stability of the overall device, reducing the risk of failures caused by vibration or deviation;

[0039] During operation, the first metal sleeve 2 is fixed on the wire drawing furnace 1. First, the second metal sleeve 3 is hung and lifted by the hanging component for lifting and moving, so that the second metal sleeve 3 is docked and installed with the first metal sleeve 2. The second metal sleeve 3 abuts against and is slidably connected to the first metal sleeve 2. Then, through the hanging rod assembly 5, the original tail stock 4 is suspended on the metal guide rod 52 and lifted and lowered by the hanging rod platform 51. The original tail stock 4 is located within the second metal sleeve 3 and enters the wire drawing furnace 1 therefrom. The hanging rod platform 51 drives the metal guide rod 52 to drive the original tail stock 4 to continuously enter the wire drawing furnace 1 for wire drawing. During the heating process in the wire drawing furnace 1, the original tail stock 4 is continuously melted and drawn until the original tail stock 4 is completely drawn, completing the wire drawing work;

[0040] During this process, the metal sleeves provide stronger structural stability, reducing the possible deviations during docking, ensuring the accuracy of optical fiber wire drawing. The design of the sliding connection makes it difficult for the original tail stock 4 to get stuck during the wire drawing process, thereby reducing the downtime in production and improving efficiency. The stable docking and smooth wire drawing process improve the wire diameter consistency of the optical fiber, ensuring the quality of the final product; at the same time, the structural design of the metal sleeves can better avoid gas leakage, reducing the risk of oxidation and other defects; and through optimized design, the loss of the tail stock and the quartz sleeve is reduced, thereby reducing the production cost. The durability of the metal sleeves means they can be used multiple times, reducing the replacement frequency and cost during long-term operation.

[0041] The first metal sleeve 2, the second metal sleeve 3, and the wire drawing furnace 1 are all provided with a cooling component 7; the cooling component 7 includes but is not limited to a circulating water cooling component 7. In this embodiment, the circulating water cooling component 7 includes a water inlet pipe 71, a water outlet pipe 72, a cooling water tank, and a water pump. The cooling water tank stores cooling water and provides a stable water source, facilitating the control of water temperature and water level; the circulating water pump is responsible for introducing the cooling water in the cooling water tank into the cooling system through the water inlet pipe 71 to ensure sufficient flow to meet the cooling requirements. The water outlet pipe 72 discharges the cooling water that has undergone heat exchange and returns it to the cooling water tank to maintain the circulation of the water flow and ensure the continuity of the cooling effect. When the cooling water flows through each of the first metal sleeve 2, the second metal sleeve 3, and the wire drawing furnace 1, it conducts heat exchange with the metal surface to reduce its temperature and prevent overheating;

[0042] The circulating water cooling component 7 can continuously and quickly remove the heat generated by the equipment, ensuring that the working temperature is maintained within a safe range, improving the overall performance of the system. Through continuous circulation, the cooling component 7 can effectively prevent temperature fluctuations and reduce the risk of material deformation and damage caused by temperature changes; moreover, compared with other cooling methods, the circulating water system usually has lower energy consumption, which helps to reduce production costs and at the same time reduce the negative impact on the environment.

[0043] The wire drawing device further includes a limit clamp 8. The limit clamp 8 is sleeved on the outer wall of the second metal sleeve 3 and is slidably connected to the second metal sleeve 3; during operation, the hanging component drives the second metal sleeve 3 to move. When the cooling component 7 on the second metal sleeve 3 contacts the limit clamp 8, the second metal sleeve 3 stops moving, ensuring that during the wire drawing process, the second metal sleeve 3 does not enter the wire drawing furnace 1 excessively;

[0044] The limit clamp 8 can effectively limit the movement range of the second metal sleeve 3, avoid mechanical damage caused by overtravel, and reduce the risk of equipment failure due to improper operation; this design realizes an automatic shutdown function, ensuring that the system can react immediately when reaching the limit position and preventing the second metal sleeve 3 from being melted. This function not only improves the operation safety but also reduces the dependence on operators and improves the overall intelligence level of the system.

[0045] The wire drawing device further includes a seal 6. Between the metal guide rod 52 and the second metal sleeve 3, and between the first metal sleeve 2 and the second metal sleeve 3, they are all sealed by the seal 6;

[0046] The seal 6 is a PTFE paper gasket or a quartz wool strip; as the seal 6, the PTFE paper gasket can withstand high-temperature environments, maintain a good sealing effect, ensure reliability under extreme conditions, effectively prevent gas and liquid leakage, improve the overall sealing performance of the system, and the PTFE paper gasket also has excellent corrosion resistance to a variety of chemical substances, suitable for various industrial applications, and the flexibility of the PTFE paper gasket makes it easy to install and replace, reducing the maintenance difficulty; as the seal 6, the quartz wool strip can withstand extremely high temperatures, suitable for sealing applications in high-temperature environments, the quartz wool strip has excellent elasticity and compressibility, can effectively fill gaps, ensure the sealing effect, the quartz wool strip also has strong resistance to a variety of chemical substances, extending the service life, and the softness of the quartz wool strip makes its installation simple, convenient for maintenance and replacement;

[0047] Utilizing the design of the seal 6 further prevents gas leakage, ensures the pressure stability inside the system, while reducing the intrusion of external pollutants, protecting the normal operation of the equipment. This sealing mechanism not only improves the safety of the equipment but also extends the service life, reduces the maintenance frequency, thereby significantly improving the overall working efficiency and reliability.

[0048] The implementation principle of the embodiment of this application is: This application mainly enhances the stability of the structure by designing a metal sleeve, reduces the butt joint deviation, ensures the accuracy of optical fiber drawing and the consistency of wire diameter, reduces the production downtime, and improves the efficiency; and the metal structure can effectively avoid gas leakage, reduce the risks of oxidation and defects. In addition, compared with the prior art, the optimized design of the metal sleeve can ensure that the original tailstock 4 is completely drawn, reduce the loss of the original tailstock 4, and can solve the problem of high loss of the previously used quartz sleeve, thereby reducing production costs and improving production quality and efficiency;

[0049] Before work, the first metal sleeve 2 is fixed on the drawing furnace 1. First, the second metal sleeve 3 is hung by the hanging component for lifting and moving, so that the second metal sleeve 3 is butt-jointed and installed with the first metal sleeve 2. The second metal cylinder 3 is in contact with and slidably connected to the first metal sleeve 2. Then, through the hanging rod component 5, the original tailstock 4 is hung on the metal guide rod 52 and lifted and lowered through the hanging rod platform 51. The original tailstock 4 is located inside the second metal sleeve 3 and enters the drawing furnace 1 therefrom. During this process, the hanging component will continue to drive the second metal sleeve 3 to move. When the cooling component 7 on the second metal sleeve 3 contacts the limit clamp 8, the second metal sleeve 3 stops moving, ensuring that during the drawing process, the second metal sleeve 3 will not enter the drawing furnace 1 excessively;

[0050] During operation, the metal guide rod 52 is driven by the rod hanging platform 51 to drive the original tailstock 4 to continuously enter the wire drawing furnace 1 for wire drawing. During the heating process in the wire drawing furnace 1, the original tailstock 4 is continuously melted and drawn until the original tailstock 4 is completely drawn, completing the wire drawing work;

[0051] During the wire drawing process, the circulating water cooling component 7 can continuously and quickly remove the heat generated by the equipment, ensure that the working temperature is maintained within a safe range, improve the overall performance of the system. Through continuous circulation, the cooling component 7 can effectively prevent temperature fluctuations and reduce the risk of material deformation and damage caused by temperature changes, thereby improving the wire drawing quality.

[0052] The above are all preferred embodiments of this application, and the protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. An optical fiber original tail handle wire drawing device, characterized in that: It includes a hanging rod assembly (5), a wire drawing furnace (1), a first metal sleeve (2) and a second metal sleeve (3). The first metal sleeve (2) is fixed on the wire drawing furnace (1). The second metal sleeve (3) is sleeved inside the first metal sleeve (2) and abuts against the first metal sleeve (2). The first metal sleeve (2) is slidably connected to the second metal sleeve (3). The hanging rod assembly (5) is used for installing the original tail stock (4) and lifting and lowering the original tail stock (4). The original tail stock (4) is located inside the second metal sleeve (3) and enters the wire drawing furnace (1) from the second metal sleeve (3) for wire drawing.

2. The optical fiber original tail handle wire drawing device according to claim 1, wherein: The hanging rod assembly (5) includes a hanging rod table (51) and a metal guide rod (52) fixed on the hanging rod table (51). One end of the metal guide rod (52) far from the hanging rod table (51) is inserted into the second metal sleeve (3) and connected to the original tail stock (4). The hanging rod table (51) drives the metal guide rod (52) to lift and lower.

3. The optical fiber original tail handle wire drawing device according to claim 2, characterized in that: It further includes a seal (6). The space between the metal guide rod (52) and the second metal sleeve (3), and the space between the first metal sleeve (2) and the second metal sleeve (3) are both sealed by the seal (6).

4. The optical fiber original tail handle wire drawing device according to claim 3, characterized in that: The seal (6) is a polytetrafluoroethylene paper gasket.

5. The optical fiber original tail handle wire drawing device according to claim 3, characterized in that: The seal (6) is a quartz wool strip.

6. The optical fiber original tail handle wire drawing device according to claim 1, wherein: The first metal sleeve (2), the second metal sleeve (3), and the wire drawing furnace (1) are provided with a cooling assembly (7).

7. The optical fiber original tail handle wire drawing device according to claim 6, characterized in that: It further includes a limit clamp (8). The limit clamp (8) is sleeved on the outer wall of the second metal sleeve (3) and is slidably connected to it. When the cooling assembly (7) on the second metal sleeve (3) contacts the limit clamp (8), the second metal sleeve (3) stops moving.

8. The optical fiber original tail handle wire drawing device according to claim 6, characterized in that: The cooling assembly (7) is a circulating water cooling assembly (7).

9. The optical fiber original tail handle wire drawing device according to claim 1, characterized in that: A metal ring (11) is provided at the furnace mouth of the wire drawing furnace (1). The first metal sleeve (2) is sleeved inside the metal ring (11) and is sealed with the metal ring (11).

10. The optical fiber original tail handle wire drawing device according to claim 1, characterized in that: It further includes a hanging assembly. The hanging assembly is used for hanging and lifting the second metal sleeve (3) so that the second metal sleeve (3) is inserted into the first metal sleeve (2) for docking.

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