Liquid nitrogen rapid cooling shaft hole assembly sealing device

Abstract

The utility model belongs to the technical field of mechanical installation devices, and relates to a liquid nitrogen rapid cooling shaft hole assembly sealing device which comprises a liquid nitrogen containing body, sealing glands are connected to the front side and the rear side of the liquid nitrogen containing body, flange holes are formed in the two ends of the liquid nitrogen containing body in a surrounding mode, and sealing cover grooves are formed in the inner walls of the sealing glands. A liquid nitrogen injection port and a positioning hole are respectively formed in the top of the liquid nitrogen accommodating body, and a lower drain outlet is formed in the bottom of the liquid nitrogen accommodating body. The utility model has the advantages of simple, scientific and economic operation, reduced production accident rate, accurate assembly of increased shaft hole clearance, elimination of maintenance time delay caused by shaft hole assembly jamming, improved maintenance plan rate, prolonged service life of equipment, close fit of all parts, reduced wear in operation, and enhanced durability.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical installation device technology, specifically relating to a liquid nitrogen rapid cooling shaft hole assembly sealing device. Background Technology

[0002] Most mechanical assembly in steel enterprises involves the dismantling and installation of equipment such as speed reducers, motor couplings, large fans, and hydraulic couplings. This requires the assembly of numerous shaft holes in various components. Maintenance work typically employs hot assembly, but this method presents several problems, including: ① Polishing shaft holes with polishing pads affects assembly accuracy; ② Assembling large workpieces presents drawbacks, necessitating the use of impact hammers. Manual pushing of the workpiece can lead to rework if obstruction occurs, causing maintenance delays and impacting production; ③ Obstruction in the assembly of large couplings requires forceful impact with impact hammers, which can reduce equipment lifespan. Hot assembly operations pose a high risk of maintenance delays, low efficiency, and high labor intensity for employees.

[0003] The following problems exist in actual use:

[0004] 1. Hot assembly requires specialized heating equipment and fuel, especially for shafts, bearings, and gears with a diameter greater than 200 mm. Some equipment requires the manufacture of heating equipment, such as oil boiling tanks and heating boxes. The large size and weight of spare parts increase the difficulty of assembly and also increase costs.

[0005] 2. Before each assembly, the shaft head of the equipment is usually polished with a polishing machine. Through the regular maintenance cycle, the shaft head will be polished and polished multiple times, which will damage the assembly interference accuracy of the shaft hole.

[0006] 3. For example, when assembling a coupling with a diameter exceeding 300mm*500mm, the large size or weight of the workpiece can easily cause the shaft hole to jam if pushed manually during the assembly process. It must be quickly inserted into place. Otherwise, the heated coupling will quickly transfer heat to the shaft head, causing it to expand and resulting in excessive clearance in the shaft hole, leading to rework. This can easily cause maintenance delays and production accidents.

[0007] 4. For example, conventional assembly of couplings requires the use of a sledgehammer for striking, especially for couplings larger than 300mm. A hammer must be used; otherwise, if jamming occurs during the manual assembly process, the hammer must be used to violently strike the coupling to help it be assembled in place. The bearing housing will then bear a strong impact force, which can easily damage the bearing housing and reduce the bearing life.

[0008] Therefore, a liquid nitrogen rapid cooling shaft hole assembly sealing device is proposed. Utility Model Content

[0009] The purpose of this invention is to provide a liquid nitrogen rapid cooling shaft hole assembly sealing device, which has the function of liquid nitrogen rapid cooling shaft hole assembly, and solves the problems of the prior art.

[0010] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a liquid nitrogen rapid cooling shaft hole assembly sealing device, including a liquid nitrogen container, with sealing caps connected to the front and rear sides of the liquid nitrogen container, flange holes arranged around both ends of the liquid nitrogen container, sealing cap grooves arranged on the inner wall of the sealing caps, a liquid nitrogen injection port and a positioning hole respectively arranged on the top of the liquid nitrogen container, and a lower drain port arranged at the bottom of the liquid nitrogen container.

[0011] Preferably, the liquid nitrogen container is a hollow cylinder, and two sealing caps are connected to the front and rear sides of the liquid nitrogen container.

[0012] Preferably, the sealing cover is provided with a disassembly cover plate on the outside and a sealing ring hole on the inside.

[0013] Preferably, the sealing cover groove adopts a labyrinth sealing style, and the inside of the sealing cover groove is filled with a sealing medium.

[0014] Preferably, the liquid nitrogen injection port is a wing nut, and the liquid nitrogen injection port is configured with an internal thread structure.

[0015] Preferably, one end of the liquid nitrogen container is inserted into the motor shaft.

[0016] Preferably, the intermediate shaft of the gear shaft is placed inside the liquid nitrogen container.

[0017] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0018] 1. This utility model is simple, scientific and economical to operate, reduces the production accident rate, and the precise assembly with increased shaft hole clearance can eliminate maintenance delays caused by shaft hole assembly jamming, improve the maintenance plan rate, and increase the service life of the equipment. The tight cooperation of each component reduces wear during operation and enhances durability.

[0019] 2. This utility model ensures the precision and smoothness of the shaft, eliminating the need for polishing. It is particularly effective when used with liquid nitrogen cooling in heavy and large couplings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of a liquid nitrogen rapid cooling shaft hole assembly sealing device;

[0022] Figure 2 A side view of a partial structure of a liquid nitrogen rapid cooling shaft hole assembly sealing device;

[0023] Figure 3 This is a structural diagram of a liquid nitrogen rapid cooling shaft hole assembly sealing device according to one embodiment;

[0024] Figure 4 This is a structural diagram of a liquid nitrogen rapid cooling shaft hole assembly sealing device according to one embodiment;

[0025] In the above figures, 1. sealing gland, 2. sealing ring hole, 3. flange hole, 4. liquid nitrogen injection port, 5. positioning hole, 6. liquid nitrogen container, 7. lower drain port, 8. disassembly cover plate, 9. sealing cover groove, 10. motor, 11. gear shaft. Detailed Implementation

[0026] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0028] Example 1, as Figure 1-2 As shown, a liquid nitrogen rapid cooling shaft hole assembly sealing device includes a liquid nitrogen container 6, which is used to contain and store injected liquid nitrogen. The liquid nitrogen rapidly cools the shaft, achieving rapid cooling of the components and quickly reaching the process temperature for assembly. Sealing caps 1 are connected to the front and rear sides of the liquid nitrogen container 6, and the sealing caps 1 are used for quick connection of flanges with shaft holes of different inner diameters. Flange holes 3 are provided around both ends of the liquid nitrogen container 6, and the flange holes 3 are used to connect with the disassembly cover plate 8 of the sealing cap 1.

[0029] The inner wall of the sealing cap 1 is provided with a sealing cap groove 9. The top of the liquid nitrogen container 6 is provided with a liquid nitrogen injection port 4 and a positioning hole 5. The positioning hole 5 is used to position the shaft inside the liquid nitrogen container 6 that needs to be frozen. The bottom of the liquid nitrogen container 6 is provided with a lower drain port 7, which is used to discharge the liquid nitrogen that fills the internal space of the liquid nitrogen container 6.

[0030] The specific design of the aforementioned key components will be discussed in detail below:

[0031] The sealing cap 1 and the disassembly cover plate 8 are provided with flange holes 3 around their edges, and are connected and fixed to both ends of the liquid nitrogen container 6 by bolts.

[0032] The liquid nitrogen container 6 is a hollow cylinder, and two sealing caps 1 are connected to the front and rear sides of the liquid nitrogen container 6.

[0033] The outer side of the sealing gland 1 is provided with a disassembly cover plate 8, which is used to seal during cooling. The inner side of the sealing gland 1 is provided with a sealing ring hole 2, which is used to place a sealing ring to ensure the sealing of the flange connection.

[0034] The sealing cover groove 9 adopts a labyrinth seal style. The inside of the sealing cover groove 9 is filled with a sealing medium, such as a pressure packing. After the shaft is inserted, the sealing cover groove 9 seals both ends of the liquid nitrogen container 6.

[0035] The liquid nitrogen injection port 4 adopts a wing nut and is configured with an internal thread structure for connecting to the liquid nitrogen device for injection.

[0036] It can be used for multiple general-purpose inner diameter sizes (e.g., φ150, φ200, φ480, etc.) and is used in conjunction with the shafts of relevant equipment in steel enterprises. It is easy to match with the size of the equipment on site. The seal is achieved by placing a pressure pack or other sealing material inside the sealing cover groove 9, which is responsible for the cut-off of the liquid nitrogen container 6 and plays a sealing role.

[0037] Example 2, as Figure 3 As shown, a liquid nitrogen rapid cooling shaft hole assembly sealing device is provided, wherein one end of the liquid nitrogen container 6 is inserted into the shaft head of the motor 10.

[0038] At this point, the sealing baffle at one end is removed, and the motor 10 shaft head is inserted into the liquid nitrogen container 6 from this end. The sealing cover groove 9 fits tightly against the motor 10 shaft to provide a stop seal. The other end is sealed by the sealing cover 1 and the removal cover plate 8. The position of the motor 10 shaft head is positioned through the positioning hole 5, and liquid nitrogen is injected through the liquid nitrogen injection port 4. After the freezing and cooling is completed, the liquid nitrogen is discharged from the lower drain port 7. Then, the sealing cover 1 and the removal cover plate 8 are removed to take out the motor 10 and complete the operation of the gear shaft 11.

[0039] Example 2, as Figure 4As shown, a liquid nitrogen rapid cooling shaft hole assembly sealing device is described, in which the intermediate shaft of gear shaft 11 is placed inside the liquid nitrogen container 6. At this time, the sealing caps 1 at both ends and the disassembly cover plate 8 are removed, and the intermediate shaft of gear shaft 11 is placed inside the liquid nitrogen container 6. Then, the sealing caps 1 at both ends are connected, and the grooves 9 of the sealing caps are tightly attached to the gear shaft 11 to provide a shut-off seal. The position of the motor shaft head is positioned through the positioning hole 5, and liquid nitrogen is injected from the liquid nitrogen injection port 4. After the freezing and cooling is completed, the liquid nitrogen is discharged from the lower drain port 7. Then, the sealing caps 1 and the disassembly cover plate 8 are removed to take out the gear shaft 11 to complete the cooling operation.

[0040] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0041] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A liquid nitrogen rapid cooling shaft hole assembly sealing device, characterized in that, The liquid nitrogen container includes a liquid nitrogen container with sealing caps connected to its front and rear sides. Flange holes are provided around both ends of the liquid nitrogen container. Sealing cap grooves are provided on the inner wall of the sealing caps. Liquid nitrogen injection port and positioning hole are provided on the top of the liquid nitrogen container. Drainage port is provided at the bottom of the liquid nitrogen container.

2. The liquid nitrogen rapid cooling shaft hole assembly sealing device according to claim 1, characterized in that, The liquid nitrogen container is a hollow cylinder, and there are two sealing caps connected to the front and rear sides of the liquid nitrogen container.

3. The liquid nitrogen rapid cooling shaft hole assembly sealing device according to claim 2, characterized in that, The outer side of the sealing cover is provided with a disassembly cover plate, and the inner side of the sealing cover is provided with a sealing ring hole.

4. The liquid nitrogen rapid cooling shaft hole assembly sealing device according to claim 3, characterized in that, The sealing cover groove adopts a labyrinth-style sealing design, and the inside of the sealing cover groove is filled with a sealing medium.

5. The liquid nitrogen rapid cooling shaft hole assembly sealing device according to claim 4, characterized in that, The liquid nitrogen injection port uses a wing nut and is designed with an internal thread structure.

6. The liquid nitrogen rapid cooling shaft hole assembly sealing device according to claim 1, characterized in that, One end of the liquid nitrogen container is inserted into the motor shaft.

7. The liquid nitrogen rapid cooling shaft hole assembly sealing device according to claim 1, characterized in that, The intermediate shaft of the gear shaft is placed inside the liquid nitrogen container.

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