Device for liquid nitrogen cold charging of slender cylindrical parts

Abstract

The utility model discloses a device for liquid nitrogen cold charging of slender cylindrical parts, which comprises a base plate, walking wheels are arranged at the bottom of the base plate, a plurality of sleeves are arranged on the base plate, the sleeves are coaxially arranged, the radiuses of the sleeves are sequentially increased from inside to outside, an annular cavity is formed between every two adjacent sleeves, and the annular cavity is communicated with the walking wheels. The utility model relates to the technical field of cold charging of parts, the device is provided with the plurality of coaxial sleeves with the radiuses increased in sequence to form the annular cavity, compared with a traditional large liquid nitrogen tank or liquid nitrogen barrel, the use amount of liquid nitrogen can be effectively reduced, meanwhile, the distribution of the liquid nitrogen in the annular cavity is more reasonable, and the liquid nitrogen is more uniform. The refrigeration effect of the liquid nitrogen can be fully utilized, the waste of the liquid nitrogen is avoided, and the production cost is greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to part cold mounting technical field, concretely for a kind of device for slender cylindrical part liquid nitrogen cold mounting. BACKGROUND

[0002] In the field of mechanical manufacturing, for the assembly of interference fit type slender cylindrical parts (such as cylinder sleeve for reciprocating compressor cylinder), there are currently mainly cold assembly, hot assembly and pressure assembly methods. The conventional method of cold assembly is to immerse the parts in a liquid nitrogen tank or barrel, causing them to shrink before assembly. However, slender cylindrical parts are usually large and long in size, which requires a large container to hold liquid nitrogen, resulting in a huge amount of liquid nitrogen usage and the inability to recover liquid nitrogen after cold assembly, leading to a significant increase in production economic costs.

[0003] Hot assembly is feasible in some cases, but the process site temperature is high, and the operator is prone to injury, and the workpiece is easily damaged during pressure assembly. At the same time, the quality of hot assembly is not easy to control, the workpiece is prone to deformation, and the part and the base hole are not firmly combined. In addition, when the containment member is large in size, the heating furnace may not meet the requirements, and it cannot be heated. At this time, if cold assembly is used, there will be the problem of larger containers and more liquid nitrogen usage.

[0004] Traditional methods such as hammering assembly, tool pushing, and pressure pushing in pressure assembly are difficult to achieve ideal assembly results in cases where the interference fit size is large, the fit diameter is large, the fit length is long, or the fit shape is complex, and the length exceeds the working range of the press machine, and there are problems such as high cost, low efficiency, and long time period.

[0005] The small cold mounting box and cold mounting cylinder currently available on the market have small volumes and are only suitable for cold mounting of small parts, lacking effective cold mounting tooling for large slender cylindrical parts. Therefore, there is an urgent need for a device that can solve the problems of poor flexibility and high cost of existing cold mounting methods. SUMMARY

[0006] To overcome the shortcomings of the prior art, the utility model provides a device for liquid nitrogen cold mounting of slender cylindrical parts, which solves the problems of waste of resources and high cost of existing cold mounting equipment.

[0007] To achieve the above purpose, the utility model realizes the following technical scheme: a device for liquid nitrogen cold mounting of slender cylindrical parts, comprising a base plate, the bottom of the base plate is provided with traveling wheels, a plurality of sleeves are arranged on the base plate, the plurality of sleeves are coaxially arranged, and the radii increase from inside to outside, and annular cavities are formed between adjacent sleeves.

[0008] Preferably, the traveling wheels are universal wheels, the number is four and is distributed at the four corners of the lower wall of the base plate.

[0009] Preferably, the base plate and the sleeve are made of stainless steel.

[0010] Preferably, the base plate and the sleeve are connected by welding.

[0011] Advantages

[0012] The utility model provides a device for elongated cylinder class spare liquid nitrogen cold dress, possesses following

[0013] Advantages:

[0014] The device forms annular cavity through the arrangement of multiple sleeves coaxial and radius increasing in turn, compared with traditional large liquid nitrogen tank or liquid nitrogen barrel, can effectively reduce the use amount of liquid nitrogen, simultaneously, the distribution of liquid nitrogen in annular cavity is more reasonable, can more fully utilize the refrigeration effect of liquid nitrogen, avoids the waste of liquid nitrogen, greatly reduces production cost.

[0015] The four universal wheels arranged at the bottom of the base plate make the device convenient to move in the work site, facilitate moving the device to the vicinity of the spare needing cold dress, improve the flexibility of cold dress operation, and the operator can easily adjust the position of the device according to actual demand, without laboriously carrying the large cold dress container.

[0016] The base plate and the sleeve are connected by welding, and the base plate and the sleeve are made of stainless steel, which guarantees the structural strength and stability of the device, the stainless steel material has good corrosion resistance, can be used for a long time in the liquid nitrogen environment, is not easy to be damaged, and prolongs the service life of the device.

[0017] The device is suitable for interference fit assembly of elongated cylinder class spares, has no damage to workpieces in cold dress mode, has good assembly effect and high efficiency, compared with hot assembly, avoids the problems of workpiece deformation and quality difficult to control caused by heating, can guarantee the centering and carrying capacity of the workpiece, and makes the combination of the spare and the base hole more firm. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 It is the structural schematic diagram of the utility model.

[0019] Fig. 2 It is the overhead structure schematic diagram of the utility model.

[0020] In the drawing: 1, base plate; 2, sleeve; 3, travelling wheel. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0022] Please refer to Figs. 1-2 The present application provides a technical solution: a device for liquid nitrogen cold loading of elongated cylindrical parts, comprising a base plate 1, wherein the bottom of the base plate 1 is provided with traveling wheels 3, and a plurality of sleeves 2 are arranged on the base plate 1, the plurality of sleeves 2 are coaxially arranged, and the radii increase from inside to outside in sequence, and annular cavities are formed between adjacent sleeves 2.

[0023] By adopting the above technical solution, the base plate 1 serves as the basic support structure of the device and bears the plurality of sleeves 2. The plurality of sleeves 2 are coaxially arranged and the radii increase from inside to outside in sequence, and annular cavities are formed between adjacent sleeves 2 for containing liquid nitrogen. When it is necessary to cold load elongated cylindrical parts, the parts are placed in the device, and the liquid nitrogen evaporates and absorbs heat in the annular cavities, so that the temperature around the parts is reduced, thereby realizing the shrinkage of the parts and constructing the basic structure for liquid nitrogen cold loading of elongated cylindrical parts. Through the design of the annular cavities, the liquid nitrogen is reasonably utilized, the amount of liquid nitrogen used is reduced, and at the same time, a uniform low-temperature environment is provided for the parts, thereby ensuring the cold loading effect.

[0024] In this embodiment, the traveling wheels 3 are universal wheels, the number of which is four and they are distributed at the four corners of the lower wall of the base plate 1.

[0025] By adopting the above technical solution, the structure of the universal wheels enables the device to move freely in all directions, and the operator can easily move the device to different positions in the work site by pushing the device.

[0026] In this embodiment, the base plate 1 and the sleeves 2 are made of stainless steel.

[0027] By adopting the above technical solution, the base plate 1 and the sleeves 2 are made of stainless steel. Stainless steel has good corrosion resistance, strength and toughness, and in the liquid nitrogen environment, the stainless steel material can maintain stable performance and is not easily affected by liquid nitrogen corrosion and low temperature, thereby ensuring the structural integrity and service life of the device.

[0028] In this embodiment, the base plate 1 and the sleeves 2 are connected by welding.

[0029] Through the skilled in the art, the parts in the case are connected in turn, the specific connection and operation sequence should refer to the following working principle, its detailed connection means, for the art is well known technology, the following mainly introduces the working principle and process.

[0030] Embodiment: in use, according to the size of the elongated cylindrical parts, inject the appropriate amount of liquid nitrogen in the appropriate annular cavity, then the workpiece is put into the annular cavity formed by the inner sleeve 2, liquid nitrogen is evenly distributed around the parts, provide refrigeration environment for the parts, wait for a period of time, so that the parts shrink to the appropriate size under the action of liquid nitrogen. When the desired shrinkage is reached, the parts are quickly removed and assembled into the corresponding matching components, complete the cold loading operation, according to the needs of subsequent work, through the walking wheel 3, the device is moved to the appropriate position, after the device is used, clean up the residual liquid nitrogen and impurities in the device, keep the device clean, so as to use next time.

[0031] It should be noted that in this text, such as first and second relationship terms are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the term "include", "contain" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent in such process, method, article or equipment. Without more limitations, the statement "including a limited element" does not exclude the existence of other identical elements in the process, method, article or equipment including the element.

[0032] Although the embodiments of the present application have been shown and described, it is understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application, the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A device for liquid nitrogen cooling of an elongated cylindrical part, characterized in that, The utility model relates to a kind of walking wheel device, including base plate (1), the bottom of the base plate (1) is equipped with walking wheel (3), a plurality of sleeve (2) are arranged on the base plate (1), a plurality of the sleeve (2) are coaxially arranged, and radius increases gradually from inside to outside, annular cavity is formed between adjacent sleeve (2).

2. The device for liquid nitrogen cooling of elongated cylindrical parts according to claim 1, characterized in that, The walking wheel (3) is a universal wheel, the number is four and is distributed at the lower wall four corners of the base plate (1).

3. The device for liquid nitrogen cooling of elongated cylindrical parts according to claim 1, characterized in that, The base plate (1) and the sleeve (2) are made of stainless steel.

4. The device for liquid nitrogen cooling of elongated cylindrical parts according to claim 1, characterized in that, The base plate (1) and the sleeve (2) are connected by welding.

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