A solid oxygen column and its integrated molding method and application

Abstract

The present invention belongs to the technical field of chemical oxygen production, and provides a solid oxygen medicine column and an integrated molding method and application thereof, wherein the integrated molding method of the solid oxygen medicine column comprises: mixing the raw materials of the solid oxygen medicine column with water, loading them into a rectangular horizontal mold, pressing and molding, and drying after demolding; wherein the moisture content of the raw materials after mixing is 1%-2%; the pressing and molding conditions are 10-15T pressure for 5-8 minutes, and then 18-22T pressure for 3-5 minutes; the drying procedure is first drying in a cool and ventilated place, then baking at 75-85°C, and then continuing to dry at 135-145°C, and cooling in a dryer after taking out. The present invention adopts a large-size / integrated mold with a specific medicine pressing procedure to obtain a complete and unbroken high aspect ratio solid oxygen medicine column, which has the advantages of stable oxygen release rate, long oxygen release time, and uniform density.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical oxygen production, and in particular to a solid oxygen drug column and an integral molding method and application thereof. Background Art

[0002] Solid oxygen generator is an oxygen supply equipment that uses sodium chlorate chemical oxygen generator as oxygen source. It has the advantages of light weight, small size, high oxygen storage capacity and simple operation. It is widely used in civil aviation, space stations, submarines, fire fighting, plateaus, battlefields, mine rescue and other fields. As a respiratory physiological oxygen source for standing or emergency personnel in confined spaces, it is the preferred oxygen supply technology when there is a lack of or insufficient power supply.

[0003] There are many types of solid oxygen source oxygen concentrators available for various earth environmental conditions. However, in ultra-low temperature environments, that is, when the ambient temperature reaches below -20°C, existing solid oxygen source oxygen concentrators usually have the problem of oxygen supply interruption. In ultra-low temperature plateau environments, the interruption of solid oxygen supply will directly lead to death. However, there is currently a lack of reliable technical means to solve this problem.

[0004] Patent CN114906815 A provides an ultra-low temperature nano solid oxygen candle oxygen generator that can achieve continuous and stable oxygen release in a -40°C environment, and CN115093300A matches it with a high-energy heating agent for solid oxygen candles that can work in a -40°C environment. In other words, the prior art provides two key basic materials for solving the oxygen supply problem in an ultra-low temperature environment. However, the operation success rate of the solid oxygen generator manufactured based on the two materials is about 30%, and the reliability is very low, which does not meet the actual needs. In addition, there are other technologies that add metal fuel or thermite or increase the amount of catalyst in the formula to achieve the purpose of greatly increasing the heat generation of the medicine column, relying on the increased heat to make up for the heat loss at the solid-solid interface between each section of the medicine column, and achieve the continuity and reliability of the medicine column when used in a low temperature environment. However, such measures all cause the complication of the composition of the solid oxygen medicine column, which will inevitably reduce the uniformity of the distribution of the components inside the medicine column, thereby affecting the stability of the combustion rate of the medicine column, and ultimately resulting in an unstable oxygen release rate, which greatly affects the performance stability, reliability and comfort of the solid oxygen generator during use. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an oxygen-solidified drug column and an integrated molding method and application thereof.

[0006] Oxygen supply interruption at low temperatures is mainly due to heat dissipation at the solid-solid interface. Limited by the oxygen supply rate, solid oxygen propellants have a high aspect ratio and have the advantages of stable oxygen supply rate and long oxygen supply time. For cylindrical propellants, the high aspect ratio leads to uneven density at each cross section, and the combustion and oxygen release processes fluctuate greatly; for rectangular propellants, the high aspect ratio often leads to propellant breakage and difficulty in processing and molding. Therefore, a number of short solid oxygen propellants are usually loaded inside the solid oxygen generator to meet both the high aspect ratio requirements and the uniformity requirements of the pressed density. However, there are solid-solid interfaces between the short propellants, and the degree of connection between the solid-solid interfaces is much lower than the degree of connection between any two adjacent cross sections inside the short propellants. Practice has shown that the location of oxygen supply interruption in solid oxygen generators under ultra-low temperature conditions mainly occurs at the interface between two short propellants. This is mainly because there are large gaps at the interface. A considerable part of the heat generated by chemical decomposition at the end of the previous section of the solid oxygen column acts on the temperature rise of the gas in the gap through radiation and heat conduction, resulting in the oxygen-producing agent at the top of the next section of the solid oxygen column receiving insufficient energy to achieve chemical decomposition. Figure 1 As shown. Continuously increasing the catalyst content can solve the problem of heat conduction efficiency between interfaces, but it also causes problems such as too fast oxygen release rate, shortened working time, and airflow impact on the human nasal cavity. The use of an integrated drug column can ensure the uniformity of component distribution in each cross section of the drug column, eliminate the multiple solid-solid interfaces in the spliced ​​drug column, and ensure that the heat generated by chemical decomposition in the reacted area is fully conducted to the unreacted area, thereby ensuring the continuous and stable chemical reaction along the radial direction of the drug column. Figure 2 shown.

[0007] Based on this, in a first aspect, the present invention provides an integrated molding method of a solid oxygen drug column, comprising the following steps:

[0008] The raw materials of the solid oxygen column are mixed with water, loaded into a rectangular horizontal mold, pressed into shape, and dried after demolding;

[0009] Among them, the moisture content of the raw materials after mixing is 1%-2%;

[0010] The compression molding conditions are: holding the pressure at 10-15T for 5-8 minutes, and then holding the pressure at 18-22T for 3-5 minutes;

[0011] The drying procedure is to first air-dry in a cool and ventilated place, then bake at a temperature of 75-85° C., then continue to dry at a temperature of 135-145° C., and cool in a dryer after taking out.

[0012] As mentioned above, it is difficult to process solid oxygen powder columns in one piece, especially high aspect ratio solid oxygen powder columns often break into several sections during demolding. The present invention avoids this problem by designing large-size, high-precision molds and specific medicine pressing procedures. The rectangular powder column pressed and formed using the integrated charging method not only has a high aspect ratio, a stable oxygen release rate and a long working time, but also has a very uniform density at each cross-sectional position. Most importantly, since the solid-solid interface is eliminated, the energy transfer efficiency is improved, the working reliability is improved, and the problem of oxygen supply interruption of the solid oxygen generator in an ultra-low temperature environment is solved.

[0013] Specifically, in the medicine pressing procedure of the present invention, the moisture content of the mixture loaded into the mold, the pressing conditions and the drying procedure are all critical and need to cooperate with each other to obtain an excellent quality one-piece solid oxygen medicine column, which is significantly different from the traditional long medicine column composed of several short medicine columns.

[0014] In a preferred embodiment of the present invention, the drying procedure is to first air-dry in a cool and ventilated place for 1-3 hours, then bake in a closed oven at 80°C for 2-2.5 hours, then dry at 140°C for 10-15 hours, and then place in a dryer to cool for 1-3 hours.

[0015] The aspect ratio of the rectangular horizontal mold of the present invention is 6-9.

[0016] Furthermore, the rectangular horizontal mold is composed of five parts, namely, a mold sleeve, a mold pressure rod, a mold gasket, a mold bottom and a mold ejection sleeve;

[0017] Among them, the tolerance of the opening in the mold sleeve is 0mm~+0.04mm; the tolerance of the pressing surface of the mold pressure rod is -0.6mm~-0.3mm; the tolerance of the mold gasket is -0.07mm~0mm;

[0018] The surface finish of openings and sections in each component is required to be no less than 0.8μm.

[0019] The rectangular horizontal mold of the present invention is a large-sized mold, and has no structural difference with the existing small-sized mold, that is, the components and the combination of the components are the same, so it will not be described in detail in this article. The present invention mainly puts forward size requirements and precision requirements for the rectangular horizontal mold, wherein the precision requirements are reflected in the tolerance and surface finish, which must meet the above requirements.

[0020] Furthermore, mixing the raw materials of the solid oxygen medicine column with water is divided into two steps: the first step is dry mixing, that is, mixing the raw materials of the solid oxygen medicine column first; the second step is wet mixing, adding water to the dry mixture and continuing to stir and mix.

[0021] In a second aspect, the present invention provides a solid oxygen drug column prepared by any one of the above-mentioned one-piece molding methods.

[0022] The solid oxygen drug column of the present invention is a rectangular drug column with an aspect ratio of 6-9.

[0023] In one embodiment of the present invention, the size of the rectangular medicine column is 25mm×25mm×150mm.

[0024] In another embodiment of the present invention, the size of the rectangular medicine column is 18 mm×18 mm×150 mm.

[0025] In a specific embodiment of the present invention, the composition of the solid oxygen column is, by mass percentage, 90.0-95.0% sodium chlorate, 2.0-5.5% potassium perchlorate, 1-3% catalyst and 0.5-5% binder.

[0026] In the above technical solution, the catalyst and the binder can be selected from conventional catalysts and binders in the field of solid oxygen powder columns. In some embodiments of the present invention, the catalyst is cobalt oxide; the binder is aluminum silicate or ceramic fiber.

[0027] In a third aspect, the present invention provides a solid oxygen generator, comprising the above-mentioned solid oxygen column.

[0028] In a fourth aspect, the present invention provides the use of the above-mentioned solid oxygen column or the above-mentioned solid oxygen generator in an ultra-low temperature environment.

[0029] Specifically, the temperature of the ultra-low temperature environment is as low as -40°C, the oxygen supply of the solid oxygen column or the solid oxygen generator is not interrupted, and the success rate is basically 100%. Even if the temperature drops to -45°C, the success rate can reach about 90%.

[0030] The present invention provides a solid oxygen powder column and an integrated molding method and application thereof. A large-size / integrated mold is used in combination with a specific medicine pressing procedure to produce a complete and unbroken high aspect ratio solid oxygen powder column. The solid oxygen powder column has the advantages of stable oxygen release rate, long oxygen release time and uniform density, and can work stably and reliably in an ultra-low temperature environment, thereby solving the problem of oxygen supply interruption of a solid oxygen generator in an ultra-low temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a schematic diagram of the spliced ​​drug column commonly used in this field.

[0033] Figure 2 It is a schematic diagram of the integrated drug column provided by the present invention.

[0034] Figure 3 The structure diagram of the mold assembly diagram used in the embodiment of the present invention is shown in FIG. Figure 1 .

[0035] Figure 4 The structure diagram of the mold assembly diagram used in the embodiment of the present invention is shown in FIG. Figure 2 .

[0036] Figure 5 This is the oxygen release rate-time curve of the medicine column in Example 1.

[0037] Figure 6 This is the oxygen release rate-time curve of the medicine column in Example 2.

[0038] Figure 7 This is the oxygen release rate-time curve of the drug column without interruption in the oxygen release process in Comparative Example 1.

[0039] Figure 8 This is the oxygen release rate-time curve of the interrupted drug column during the oxygen release process in Comparative Example 1.

[0040] In the figure: 1: mold sleeve; 2: mold pressure rod; 3: mold gasket; 4: mold bottom; 5: mold ejection sleeve; 6: medicine column. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the field or the product instructions are used. If no manufacturer is specified for the reagents or instruments used, they are all conventional products that can be purchased through regular channels.

[0043] like Figure 3-4 As shown, the rectangular parallelepiped mold used in the following embodiments is composed of a mold sleeve 1, a mold pressure rod 2, a mold gasket 3, a mold bottom 4 and a mold ejection sleeve 5, a total of five parts;

[0044] Among them, the material of the mold sleeve 1, the mold pressure rod 2, the mold gasket 3 and the mold bottom 4 are all 440C, and the material of the mold withdrawal sleeve 5 is aluminum;

[0045] The tolerance of the opening in the mold sleeve 1 is 0mm to +0.04mm; the tolerance of the pressing surface of the mold pressure rod 2 is -0.6mm to -0.3mm; the tolerance of the mold gasket 3 is -0.07mm to 0mm;

[0046] The surface finish of openings and sections in each component is required to be no less than 0.8μm.

[0047] In the pill pressing process, the mold bottom 4 is located at Figure 1 The bottom part shown in the figure plays a supporting role. When the mold is removed after the pressing is completed, the mold bottom 4 is replaced with a mold removal sleeve 5 (such as Figure 4 Demoulding is performed by pressing the button (as shown).

[0048] Example 1

[0049] This embodiment provides a 25mm×25mm×150mm rectangular solid oxygen drug column, the formula and preparation method of which are as follows:

[0050] Formula of solid oxygen column: 92.0% sodium chlorate, 5.2% potassium perchlorate, 1.3% cobalt oxide, 1.5% aluminum silicate. Weigh sodium chlorate, potassium perchlorate, cobalt oxide, and aluminum silicate according to the required proportions of the formula, with a total weight of 216 grams. Put the weighed 4 raw materials into a mixer for mechanical stirring and mixing, set the speed to 100r / min, and the mixing time to 1 hour. After dry mixing, add 4mL of water and continue stirring and mixing, and the mixing time is 30min. After wet mixing, pour the mixture into a 25mm×25mm×150mm rectangular mold, use a 60T hydraulic press to press and mold it at a pressure of 15T, hold the pressure for 5 minutes, and then hold the pressure at 20T for 3.5 minutes. After demolding, a wet rectangular solid oxygen column is obtained, which is dried in a cool and ventilated place for 2 hours, then baked in a closed oven at 80°C for 2 hours, and then placed in a high-temperature oven at 140°C for 12 hours. After taking it out, place it in a dryer to cool for 2 hours to obtain a 25mm×25mm×150mm dry column.

[0051] The obtained drug column is loaded into a metal shell to make a corresponding solid oxygen generator, which is placed in a refrigerator with a temperature set at -40°C for 24 hours. After being taken out, it is immediately started by mechanical ignition.

[0052] Results: The oxygen release process was uninterrupted, the oxygen release rate curve was stable, the total oxygen release was 84.0L, the oxygen release time was 30.5min, and the average oxygen release rate was 2.75L / min. Ten groups of experiments were carried out continuously, and reliable oxygen release was achieved. The specific results are shown in Table 1. This shows that the rectangular solid oxygen column or solid oxygen generator provided in this embodiment can avoid oxygen supply interruption at low temperature (-40℃). Its oxygen release rate-time curve is shown in Figure 5 shown.

[0053] Table 1 Parallel experiment results in Example 1

[0054]

[0055] Example 2

[0056] This embodiment provides a 18mm×18mm×150mm rectangular solid oxygen drug column, the formula and preparation method of which are as follows:

[0057] Formula of solid oxygen column: 93.5% sodium chlorate, 4.7% potassium perchlorate, 1.3% cobalt oxide, 0.5% aluminum silicate. Weigh sodium chlorate, potassium perchlorate, cobalt oxide, and aluminum silicate according to the proportion required by the formula, with a total weight of 216 grams. Put the weighed 4 raw materials into the mixer for mechanical stirring and mixing, set the speed to 210r / min, and mix for 2 hours. After dry mixing, add 2.5mL of water and continue stirring and mixing for 60min. After wet mixing, pour the mixture into a 18mm×18mm×150mm rectangular mold, use a 60T hydraulic press to press and mold at a pressure of 11T, hold the pressure for 5.5 minutes, and then press at a pressure of 18T, hold the pressure for 3.5 minutes. After demolding, the wet solid oxygen medicine column is obtained, which is dried in a cool and ventilated place for 2 hours, then baked at 75°C, and then further dried at 145°C. After being taken out, it is cooled in a dryer for 2 hours to obtain a dry medicine column of 18mm×18mm×150mm.

[0058] The obtained drug column is loaded into a metal shell to make a corresponding solid oxygen generator, which is placed in a refrigerator with a temperature set at -45°C for 24 hours. After being taken out, it is immediately started by mechanical ignition.

[0059] Results: The oxygen release process was uninterrupted, the oxygen release rate curve was stable, the total oxygen release was 41.8L, the oxygen release time was 20.3min, and the average oxygen release rate was 2.06L / min. Ten groups of experiments were carried out continuously, and 9 groups achieved reliable oxygen release. The specific results are shown in Table 2. The operation success rate was about 90%, because the freezing temperature was reduced by 5℃. The oxygen release rate-time curve is shown in Figure 6 shown.

[0060] Table 2 Parallel experiment results in Example 2

[0061]

[0062] Comparative Example 1

[0063] This comparative example provides a 25mm×25mm×150mm rectangular solid oxygen powder column, which is different from Example 1 in that after dry mixing, 12mL of water is added and stirred for 30min. The subsequent pressing, drying, heat preservation, ignition test and other operation processes are the same as those in Example 1.

[0064] The obtained drug column is loaded into a metal shell to make a corresponding solid oxygen generator, which is placed in a refrigerator with a temperature set at -40°C for 24 hours. After being taken out, it is immediately started by mechanical ignition.

[0065] Results: 10 rounds were tested in parallel, of which 3 rounds had no interruption in oxygen release, with oxygen release amounts of 77L, 75L, and 78L, and corresponding oxygen release times of 28.3min, 28.7min, and 29.1min, respectively. In the other 7 rounds, oxygen release was interrupted, with oxygen release amounts of 33.7L, 34.1L, 33.8L, 33.9L, 33.7L, 34.0L, and 33.8L, and oxygen release times of 13.2min, 13.8min, 13.9min, 13.6min, 13.6min, 13.8min, and 13.5min, respectively. The specific results are shown in Table 3. The oxygen release rate-time curve of the uninterrupted oxygen release column is shown in Figure 7 The oxygen release rate-time curve of the drug column with interrupted oxygen release process is shown in Figure 8 shown.

[0066] Table 3 Parallel experiment results in Comparative Example 1

[0067]

[0068] Comparative Example 2

[0069] This comparative example provides a 25mm×25mm×150mm rectangular solid oxygen powder column, which is different from Example 1 in that after wet mixing, the mixture is poured into a 25mm×25mm×150mm rectangular parallelepiped mold, and a 60T hydraulic press is used to press and mold at a pressure of 18T for 5 minutes. The subsequent drying, heat preservation treatment, ignition test and other operating processes are the same as those of Example 1.

[0070] The obtained drug column is loaded into a metal shell to make a corresponding solid oxygen generator, which is placed in a refrigerator with a temperature set at -40°C for 24 hours. After being taken out, it is immediately started by mechanical ignition.

[0071] Results: 10 rounds of parallel tests were conducted, of which 2 rounds had no interruption in oxygen release, with oxygen release volumes of 80L and 79L, and corresponding oxygen release times of 26.5min and 26.7min. In the other 8 rounds, oxygen release was interrupted, with oxygen release volumes of 30.1L, 30.5L, 30.8L, 30.4L, 30.5L, 30.3L, 30.5L, and 30.8L, and oxygen release times of 12.0min, 12.5min, 12.3min, 12.2min, 12.1min, 12.2min, 12.2min, and 12.6min, respectively. The specific results are shown in Table 4.

[0072] Table 4 Parallel experiment results in Comparative Example 2

[0073]

[0074] Comparative Example 3

[0075] This comparative example provides a 25mm×25mm×150mm rectangular solid oxygen powder column, which is different from Example 1 in that the wet rectangular solid oxygen powder column obtained after demoulding is placed in a high-temperature oven at 160°C for drying for 14 hours, and then taken out and placed in a dryer for cooling for 2 hours.

[0076] The obtained drug column is loaded into a metal shell to make a corresponding solid oxygen generator, which is placed in a refrigerator with a temperature set at -40°C for 24 hours. After being taken out, it is immediately started by mechanical ignition.

[0077] Results: Parallel tests were conducted for 10 rounds, of which 2 rounds had no interruption in oxygen release, with oxygen release amounts of 81L and 80L, and corresponding oxygen release times of 27.0min and 27.1min. In the other 8 rounds, oxygen release was interrupted, with oxygen release amounts of 38.2L, 38.3L, 38.5L, 38.3L, 38.9L, 30.3L, 38.5L, and 38.6L, and oxygen release times of 10.2min, 10.5min, 10.4min, 10.2min, 10.2min, 10.8min, 10.4min, and 10.3min, respectively. The specific results are shown in Table 5.

[0078] Table 5 Parallel experiment results in Comparative Example 3

[0079]

[0080] Comparative Example 4

[0081] In this comparative example, a solid oxygen column formed by splicing four short columns of 25 mm×25 mm×38 mm was prepared by referring to other methods.

[0082] The obtained drug column is loaded into a metal shell to make a corresponding solid oxygen generator, which is placed in a refrigerator with a temperature set at -40°C for 24 hours. After being taken out, it is immediately started by mechanical ignition.

[0083] Results: 10 rounds of parallel tests were conducted, of which 2 rounds had no interruption in oxygen release, with oxygen release volumes of 82L and 82L, and corresponding oxygen release times of 25.0min and 25.1min. In the other 8 rounds, oxygen release was interrupted, with oxygen release volumes of 44.2L, 44.5L, 44.9L, 42.5L, 43.9L, 44.8L, 44.1L, and 45.1L, and oxygen release times of 12.9min, 12.8min, 13.0min, 11.9min, 12.2min, 12.3min, 12.0min, and 13.1min, respectively. The specific results are shown in Table 6.

[0084] Table 6 Parallel experiment results in Comparative Example 4

[0085]

[0086] It should be noted that the endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed in this article.

[0087] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "specific implementation methods", or "some specific implementation methods" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for integrally forming a solid oxygen drug column, characterized in that: The following steps are involved: The raw materials of the solid oxygen column are mixed with water, loaded into a rectangular horizontal mold, pressed into shape, and dried after demolding; Among them, the moisture content of the raw materials after mixing is 1%-2%; The compression molding conditions are: holding the pressure at 10-15T for 5-8 minutes, and then holding the pressure at 18-22T for 3-5 minutes; The drying procedure is to first air-dry in a cool and ventilated place, then bake at 75-85°C, then continue drying at 135-145°C, and cool in a dryer after taking out; The aspect ratio of the rectangular horizontal mold is 6 to 9; The rectangular horizontal mold is composed of five parts, namely, a mold sleeve, a mold pressure rod, a mold gasket, a mold bottom and a mold ejection sleeve; Among them, the tolerance of the opening in the mold sleeve is 0mm~+0.04mm; the tolerance of the pressing surface of the mold pressure rod is -0.6mm~-0.3mm; the tolerance of the mold gasket is -0.07mm~0mm; The surface finish of openings and sections in each component is required to be no less than 0.8μm.

2. The method for integrally forming the solid oxygen drug column according to claim 1, characterized in that: The drying procedure is to first air-dry in a cool and ventilated place for 1-3 hours, then bake in a closed oven at 80° C. for 2-2.5 hours, then dry at 140° C. for 10-15 hours, and then place in a dryer to cool for 1-3 hours.

3. A solid oxygen drug column, characterized in that: The invention is prepared by the one-piece molding method according to claim 1 or 2.

4. The oxygen-fixing drug column according to claim 3, characterized in that: The solid oxygen charge column is a rectangular charge column with an aspect ratio of 6-9.

5. The oxygen-fixing drug column according to claim 3 or 4, characterized in that: In terms of mass percentage, the composition of the solid oxygen column is: 90.0-95.0% sodium chlorate, 2.0-5.5% potassium perchlorate, 1-3% catalyst and 0.5-5% binder.

6. A solid oxygen generator, characterized in that: The invention comprises the oxygen-fixing drug column as described in any one of claims 3 to 5.

7. Use of the solid oxygen drug column according to any one of claims 3 to 5 in an environment with a temperature as low as -40°C, characterized in that: The solid oxygen medicine column supplies oxygen without interruption.

8. The use of the solid oxygen generator according to claim 6 in an environment with a temperature as low as -40°C, characterized in that: The solid oxygen generator supplies oxygen without interruption.

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