Sample transfer box

Abstract

The utility model belongs to the field of transportation or storage of petroleum geology core samples, and particularly relates to a sample transfer box. The sample transfer box comprises a box body and a box cover, a liquid nitrogen containing cavity is formed in the box body, the liquid nitrogen containing cavity is defined by a cooling top wall, a bottom wall and side walls, and a plurality of cooling holes are formed in the cooling top wall; a sample storage plate for placing a sample is arranged at the upper part of the cooling top wall; the cooling holes are communicated with the upper space of the sample storage plate through a cold air circulation channel; the projection of the sample storage plate in the vertical direction covers the cooling holes, and the sample storage plate is further provided with a liquid nitrogen drainage structure for draining liquid nitrogen overflowing from the cooling holes into the liquid nitrogen containing cavity again. According to the utility model, the sample is not in direct contact with liquid nitrogen in the whole low-temperature storage or transportation process, so that the sample package is prevented from being damaged because the liquid nitrogen is in contact with the sample package.

Description

Technical Field

[0001] The utility model belongs to the field of transportation or storage of petroleum geological core samples, and in particular relates to a sample transfer box. Background Art

[0002] my country is rich in unconventional oil and gas resources, which are characterized by multiple eras, multiple layers, wide distribution and great potential. Unconventional oil and gas resources mainly include: tight oil, shale oil, oil shale oil and oil sands. The geochemical indicators for evaluating shale oil mainly include organic matter abundance, organic matter type and organic matter maturity. In addition to the above indicators, it is also very important to evaluate the fluidity of shale oil reservoirs to form large-scale shale oil reservoirs. Due to the characteristics of shale being dense, low porosity and low permeability, and the high relative density and viscosity of oil, it is more difficult to flow underground. The key to restricting the exploration and development of shale oil reservoirs is not the oil content in the shale, but how many grams of movable amount it has. In theory, the free amount is the theoretical maximum movable amount. The evaluation of shale oil adsorption and free amount / movable amount is very critical.

[0003] At present, the main method for evaluating the adsorption amount, free amount / mobile amount of shale oil is oil saturation index, OSI = S1 / TOC, where S1 is the pyrolysis parameter, generally called residual hydrocarbon, and TOC is the organic carbon parameter. The residual hydrocarbon S1 is measured by Rock-Eval pyrolysis instrument. The residual hydrocarbon S1 is mainly composed of C7-C 33 Hydrocarbon compounds are formed by thermal decomposition. Among them, normal alkanes C7H 16 The melting point is -90.3℃, the boiling point is 98.4℃; normal alkane C 19 H 40 The melting point is 32°C and the boiling point is 330°C. 19 Hydrocarbon compounds are volatile and affect the value of residual hydrocarbon S1. In order to measure more accurate residual hydrocarbon S1, how to reduce C7-C 19 The volatilization of hydrocarbon compounds and the retention of these hydrocarbon compounds as much as possible are the keys to accurately measure the residual hydrocarbon S1.

[0004] To obtain reliable residual hydrocarbon S1, three steps must be implemented: sampling on the core (shale core) just taken from the well, transportation of shale samples, indoor testing and data processing. Sampling and testing have strict safety operating specifications and technical standards, but shale samples are generally transported in insulated barrels with liquid nitrogen as a cooling medium. The Chinese utility model patent with announcement number CN204355494U discloses a liquid nitrogen frozen sample classification and transfer device, including a box body and a box cover, the inner surface of the box body is a thermal insulation layer, and a number of partitions are provided inside the box body. The partitions are vertically arranged to isolate the internal space of the box body into multiple areas. When in use, liquid nitrogen is poured into the box body, and the liquid nitrogen is dispersed to various areas of the box body through the gap between the partition and the box body. Then, after the liquid is put into the surface of the liquid nitrogen, the liquid nitrogen is used to achieve rapid low-temperature freezing of the sample.

[0005] After shale core sampling, it is generally wrapped with kraft paper or other packaging paper and put into liquid nitrogen, and then liquid nitrogen is used to achieve low-temperature storage or transportation. However, kraft paper or other packaging paper will become brittle and very easy to break after direct contact with liquid nitrogen. After liquid nitrogen contacts the sample through the damaged part, it will also affect the properties of the sample, thereby affecting the accuracy of the sample analysis test results. Utility Model Content

[0006] The utility model aims to provide a sample transfer box to solve the problem that sample packaging is easily damaged during low-temperature storage or transportation of samples.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] A sample transfer box comprises a box body and a box cover, wherein a liquid nitrogen containing chamber is arranged in the box body, and the liquid nitrogen containing chamber is surrounded by a cooling top wall, a bottom wall and side walls, and a plurality of cooling holes are opened on the cooling top wall; a sample storage plate for placing samples is arranged on the upper part of the cooling top wall, and the cooling holes are connected to the upper space of the sample storage plate through a cooling air circulation channel; the projection of the sample storage plate in the up and down directions covers the cooling holes, and a liquid nitrogen drainage structure for redirecting the liquid nitrogen overflowing from the cooling holes into the liquid nitrogen containing chamber is also arranged on the sample storage plate.

[0009] The utility model belongs to an improved invention creation. By arranging a liquid nitrogen containing chamber and a cooling hole, the cold air generated by the liquid nitrogen is used to store or transport the sample at a low temperature. After the liquid nitrogen boils or overflows from the cooling hole due to transportation bumps, the sample storage plate blocks the liquid nitrogen from directly contacting the sample packaging. The overflowed liquid nitrogen returns to the liquid nitrogen containing chamber through a liquid nitrogen drainage structure, so that the liquid nitrogen is prevented from being retained outside the liquid nitrogen containing chamber, and it is ensured that the sample is not in direct contact with the liquid nitrogen during the entire low-temperature storage or transportation process, so that the sample packaging is prevented from being damaged due to the liquid nitrogen contacting the sample packaging.

[0010] Preferably, the outer edge of the sample storage plate is provided with a folded edge that folds downward, and the folded edge forms the liquid nitrogen drainage structure.

[0011] Further preferably, the sample storage plate is connected to the upper part of the cooling top wall through a support, and the cool air circulation channel includes a longitudinal spacing between the cooling holes on the cooling top wall and the sample storage plate, and a transverse spacing located outside the folded edge.

[0012] Preferably, the cooling top wall is opposite to and spaced from the bottom wall of the box body, a side wall partition is provided in the box body opposite to and spaced from the side wall of the box body, the bottom wall of the liquid nitrogen accommodating chamber is formed by a corresponding part of the bottom wall of the box body, the side wall of the liquid nitrogen accommodating chamber is formed by a corresponding part of the side wall partition, and a cold source storage tank is formed between the side wall partition and the corresponding side wall of the box body.

[0013] Further preferably, the side wall partition includes a non-porous portion for enclosing the liquid nitrogen containing chamber and a cooling portion connected to the non-porous portion, and the cooling portion is provided with cooling air circulation holes for cooling air generated by a cooling source in a cooling source storage tank to flow through.

[0014] Further preferably, two rows of frozen bottles are placed in the cold source storage tank along the up and down directions, and each row of frozen bottles includes a plurality of frozen bottles continuously arranged along the inner side wall of the box body.

[0015] Preferably, the box body is provided with a liquid nitrogen filling pipe for filling liquid nitrogen into the liquid nitrogen containing chamber.

[0016] Preferably, a sample basket is placed on the upper portion of the sample storage plate, and a ventilation hole is provided on the basket body of the sample basket.

[0017] Preferably, the box cover is provided with a sealing structure for sealing the box body opening, and the box cover is provided with a pressure relief hole, in which a pressure relief cover is installed.

[0018] Further preferably, the box cover is provided with a lofting hole and a lofting cover sealingly matched with the lofting hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front view of an embodiment of a sample transfer box of the utility model;

[0020] Figure 2 It is a side view of an embodiment of the sample transfer box of the utility model;

[0021] Figure 3 A top view of an embodiment of a sample transfer box of the utility model;

[0022] Figure 4 for Figure 1 The structural diagram of the sample basket;

[0023] Figure 5for Figure 1 The structural diagram of the middle screw cap;

[0024] Figure 6 for Figure 1 Structural schematic diagram of the middle pressure relief cover;

[0025] Among them, 1-box body; 100-box body bottom wall; 101-box body side wall; 2-box cover; 3-sealing gasket; 4-square ring edge; 5-liquid nitrogen containing chamber; 6-cooling top wall; 7-cooling hole; 8-side wall partition; 9-cooling air circulation hole; 10-cold source storage tank; 11-freezing bottle; 12-liquid nitrogen filling pipe; 13-valve; 14-sample storage plate; 141-folded edge; 15-cooling air circulation channel; 16-pillar; 17-sample basket; 171-handle; 172-air vent; 18-handle; 19-stakeout hole; 20-screw cap; 200-round head; 201-coarse threaded column; 202-circular groove; 203-handle; 21-pressure relief hole; 22-pressure relief cover; 220-upper cover body; 221-lower extension part; 23-shale sample. DETAILED DESCRIPTION

[0026] In the prior art, sample transfer boxes using liquid nitrogen as a cooling medium generally utilize liquid nitrogen to directly contact the sample to achieve low-temperature storage of the sample. During the storage and transportation of shale samples, liquid nitrogen will destroy the sample packaging and adversely affect the properties of the sample. In addition, since liquid nitrogen is directly poured into the sample transfer box, it is easy to cause low-temperature injuries to the staff.

[0027] The technical concept of the utility model is to isolate the liquid nitrogen from the sample by providing a liquid nitrogen containing chamber with a cooling hole. The cool air generated by the liquid nitrogen can cool the sample through the cooling hole. Considering that the liquid nitrogen may overflow from the cooling hole due to boiling of the liquid nitrogen or transportation bumps, a sample storage plate and a liquid nitrogen drainage structure are arranged at a position facing the cooling hole, so that the liquid nitrogen overflowing from the liquid nitrogen containing chamber is returned to the liquid nitrogen containing chamber after being blocked and drained by the sample storage plate.

[0028] The utility model as a whole provides a sample transfer device that isolates the sample from the liquid nitrogen during use. Under the premise of meeting the low-temperature storage or transportation of the sample, the sample is isolated from the liquid nitrogen, so that the liquid nitrogen does not directly contact the sample packaging, and will not cause adverse effects on the sample packaging and the sample itself. In addition, through further optimized design, the sample transfer box of the utility model can further achieve the effects of reducing the use of nitrogen, quantitatively filling liquid nitrogen, avoiding excessive pressure in the box caused by liquid nitrogen evaporation, and avoiding low-temperature injuries to the staff, thereby ensuring that the collected shale samples can be transported to the laboratory at low temperature, reducing the C7-C 19 The loss of hydrocarbon compounds improves the accuracy of the numerical evaluation of residual hydrocarbon S1.

[0029] The implementation process of the utility model is described in detail below in conjunction with specific embodiments.

[0030] The embodiment of the sample transfer box of the utility model is as follows Figure 1 As shown, the box body 1 and the box cover 2 are included. The box body 1 is the place where the shale sample is placed and can cool the shale sample to achieve low-temperature temporary storage of the sample and reduce the C7-C 19 The purpose of volatilization of hydrocarbon compounds. There is no special requirement for the shape of the box 1, which can meet the storage and transportation of shale samples. Figure 1 The box body 1 is shown as a rectangular example. The box cover 2 can be covered on the upper opening of the box body 1 to reduce the large amount of cool air overflowing. In order to increase the sealing performance of the box body 1 and the box cover 2 after they are covered, a sealing matching structure is provided on the box body 1 and the box cover 2. In this embodiment, a sealing gasket 3 is provided around the lower part of the box cover 2, and a square ring edge 4 is correspondingly provided on the upper part of the box body 1. After the box cover 2 is covered on the box body 1, the sealing gasket 3 is pressed against the square ring edge 4 to achieve the sealing of the upper opening of the box body 1 and reduce the cool air inside the box body 1 from dissipating outward. The box cover 2 is hinged on the box body 1 to facilitate the opening and closing of the box cover 2.

[0031] A liquid nitrogen containing chamber 5 is provided in the box body 1, and the liquid nitrogen containing chamber 5 is surrounded by a cooling top wall 6, a bottom wall and a side wall, and a plurality of cooling holes 7 are provided on the cooling top wall 6. The liquid nitrogen containing chamber 5 is used to contain liquid nitrogen, and the cooling top wall 6 and the cooling holes 7 make the liquid nitrogen containing chamber form a semi-closed chamber, that is, the cool air generated by the liquid nitrogen can flow from the cooling holes 7 to the internal space of the box body 1, and the presence of the non-cooling hole portion of the cooling top wall 6 reduces the direct exposure of the liquid nitrogen inside the box body 1 to a certain extent, creating good conditions for the isolation of the liquid nitrogen and the shale sample.

[0032] The liquid nitrogen containing chamber 5 is arranged at the bottom of the box body 1. Figure 1 and Figure 2 , which is surrounded by the cooling top wall 6, the side wall partition 8 and the corresponding parts of the box bottom wall 100. The cooling top wall 6 and the side wall partition 8 are arranged parallel and spaced relative to the box bottom wall 100 and the box side wall 101, respectively. At this time, the corresponding parts of the side wall partition 8 form the side walls of the liquid nitrogen receiving chamber 5, and the corresponding parts of the box bottom wall 100 form the bottom wall of the liquid nitrogen receiving chamber 5. Among the cooling top wall 6, the bottom wall and the side wall that surround the liquid nitrogen receiving chamber 5, only the cooling top wall 6 is provided with a plurality of cooling holes 7 arranged in an array, see Figure 3 The side wall partition 8 includes a bottom imperforate portion and a cooling portion connected to the imperforate portion, and the cooling portion is provided with cool air circulation holes 9 arranged in an array. The imperforate portion of the side wall partition 8 is used to enclose the liquid nitrogen containing chamber 5.

[0033] At the same time, a cold source storage tank 10 is formed between the side wall partition 8 and the box side wall 101, and functional substances can be filled in the cold source storage tank 10 to achieve functions such as heat preservation and cooling. Figure 1 and Figure 2 As shown, two rows of frozen bottles 11 are installed in the cold source storage tank 10 along the up and down directions, and each row of frozen bottles 11 includes a plurality of frozen bottles 11 continuously arranged along the inner wall of the box body. The frozen bottles 11 are filled with refrigerant. The arrangement of the frozen bottles 11 in the cold source storage tank 10 can not only reduce the dissipation of cool air in the box, but also distribute cool air into the box through the cool air circulation holes 9 on the side wall partition 8, thereby maintaining the low temperature in the box and effectively reducing the consumption of liquid nitrogen.

[0034] In other implementations, the liquid nitrogen holding chamber 5 may also be directly surrounded by the corresponding parts of the cooling top wall 6, the box side wall 101 and the box bottom wall 100. In this case, the corresponding parts of the box side wall 101 and the box bottom wall 100 respectively form the side wall and the bottom wall of the liquid nitrogen holding chamber 5. In this implementation, the volume of the liquid nitrogen holding chamber 5 is larger and can accommodate more liquid nitrogen. In addition, the box side wall may be provided with an insulation layer to reduce the escape of cool air to the outside.

[0035] In order to facilitate the filling of liquid nitrogen, a liquid nitrogen filling pipe 12 connected to the liquid nitrogen containing chamber 5 is provided on the box body 1. The entrance height of the liquid nitrogen filling pipe 12 is higher than the liquid nitrogen containing chamber 5, and a valve 13 is provided on the liquid nitrogen filling pipe 12. When liquid nitrogen needs to be filled, the liquid nitrogen filling pipe 12 is connected to the liquid nitrogen tank, and the liquid nitrogen is filled into the liquid nitrogen containing chamber 5 through the liquid nitrogen filling pipe 12. The quantitative filling of liquid nitrogen can be achieved according to the volume of the liquid nitrogen containing chamber 5, avoiding the uncontrollable amount of liquid nitrogen added and the waste of liquid nitrogen caused by directly pouring liquid nitrogen into the sample transfer box in the prior art. At the same time, this method can also avoid the operational risks and personal injuries caused by directly dumping liquid nitrogen.

[0036] A sample storage plate 14 for placing samples is provided on the upper part of the cooling top wall 6, and the cooling holes 7 on the cooling top wall 6 are connected to the upper space of the sample storage plate 14 through the cool air circulation channel 15. The sample storage plate 14 has the basic function of bearing the weight of the shale sample 23, and the cool air generated by the liquid nitrogen in the liquid nitrogen holding chamber can reach the top of the sample storage plate 14 through the cooling holes 7 and the cool air circulation channel 15 and effectively cool the sample on the sample storage plate 14. In this embodiment, the sample storage plate 14 is a square panel, and the sample storage plate 14 is connected to the top of the cooling top wall 6 through the pillars 16 arranged on the cooling top wall 6.

[0037] See also Figure 2 The outer edges of the sample storage plate 14 are folded downward to form a folded edge 141, and the cool air circulation channel 15 includes a longitudinal interval between the cooling hole 7 arranged on the cooling top wall 6 and the sample storage plate 14, and a transverse interval located outside the folded edge 141. The transverse interval is formed between the folded edge 141 of the sample storage plate and the side wall partition 8.

[0038] In addition, the folded edge 141 on the sample storage plate 14 forms a liquid nitrogen drainage structure. When the liquid nitrogen overflows from the cooling hole 7 and reaches the sample storage plate 14, it flows along the folded edge 141 to the cooling top wall 6, and then flows back to the liquid nitrogen containing chamber 5 through the cooling hole 7. Figure 3 The relative positions of the sample storage plate 14 and the cooling top wall 6 are shown, wherein the sample storage plate 14 only shows the folded edge 141 part, and the cooling hole area of ​​the cooling top wall 6 is located as a whole within the downward projection range of the sample storage plate 14. In this way, when liquid nitrogen is added to the liquid nitrogen holding chamber 5 and boiling occurs, or when the sample transfer box is bumped during transportation and causes liquid nitrogen to overflow from the cooling hole 7, the sample storage plate 14 acts as a barrier to prevent the liquid nitrogen from splashing upward and contacting the sample. At the same time, further cooperation with the liquid nitrogen drainage structure can make this part of the overflowed liquid nitrogen re-drained back to the liquid nitrogen holding chamber 5, avoiding liquid nitrogen from remaining outside the liquid nitrogen holding chamber 5, and reducing the possibility of direct contact between the sample and the liquid nitrogen.

[0039] In order to facilitate the overall taking of shale samples, a sample basket 17 is also placed on the sample storage plate 14. Figure 4 As shown, handles 171 are provided on opposite sides of the top of the sample basket 17, and a plurality of air holes 172 are evenly arranged around the basket body of the sample basket 17, so that cool air can enter the basket through the air holes, contact the sample and cool the sample.

[0040] In order to facilitate the handling of the sample transfer box, handles 18 are provided in the middle of both sides of the box body. A sample hole 19 is provided in the middle of the box cover 2, and a screw cap 20 is installed in the sample hole 19. Figure 5 As shown, the screw cap 20 includes a circular head 200 and a coarse threaded column 201 connected below the circular head 200. The coarse threaded column 201 is covered with a sealing ring. The circular head 200 is provided with a circular groove 202, and a long handle 203 is provided in the circular groove 202. The opening or closing of the lofting hole 19 can be achieved by screwing the screw cap 20. The box cover 2 is also provided with a pressure relief hole 21, and a pressure relief cover 22 is installed in the pressure relief hole 21. Figure 6 As shown, the pressure relief cover 22 includes an upper cover body 220 connected to a lower extending portion 221 below the upper cover body 220. The lower extending portion 221 is made of foam material, and the upper cover body 220 is made of stainless steel, so that the overall material is light and easy to be pushed open for pressure relief. When liquid nitrogen continues to evaporate to form nitrogen gas and causes the pressure in the box body 1 to exceed the threshold, the nitrogen gas pushes the pressure relief cover 22 open for pressure relief, thereby avoiding the risk of accidents caused by the continuous increase of pressure in the box body 1.

[0041] The scheme for transferring and transporting shale samples using the utility model is as follows:

[0042] Usage plan 1:

[0043] 1. Place the frozen bottle 11 in a rapid low-temperature freezing refrigerator and freeze it into ice.

[0044] 2. Freeze the shale sample 23 in a rapid low-temperature freezer.

[0045] 3. Place the cryo-bottle 11 in the cold source storage tank 10 of the sample transfer box.

[0046] 4. Connect the sample transfer box to the liquid nitrogen tank and fill the liquid nitrogen containing chamber 5 of the sample transfer box with liquid nitrogen.

[0047] 5. Open the screw cap 20 and place the shale sample 23 in the sample basket 17.

[0048] 6. Screw on the screw cap 20.

[0049] 7. Place the sample transfer box containing the shale sample 23 onto the transport vehicle.

[0050] 8. During transportation to the laboratory, the pressure relief cover 22 can be pulled out and the temperature inside the box can be measured with a thermometer. If it is found that the temperature does not meet the required low temperature conditions, liquid nitrogen can be injected into the liquid nitrogen containing chamber 5 of the sample transfer box to maintain the low temperature inside the sample transfer box.

[0051] 9. After the sample arrives at the laboratory, the screw cap 20 of the sample transfer box containing the shale sample 23 is opened, and the shale sample 23 is taken out and analyzed.

[0052] 10. During the experiment, the sample transfer box can also be used as a low-temperature storage box for shale samples.

[0053] Use option 2:

[0054] 1. Place the cryo-bottle 11 in the cold source storage tank 10 of the sample transfer box.

[0055] 2. Connect the sample transfer box to the liquid nitrogen tank, and fill the liquid nitrogen containing chamber 5 of the sample transfer box with liquid nitrogen, so that the temperature of the sample transfer box drops rapidly, and the freezing liquid in the freezing bottle 11 is quickly frozen into ice.

[0056] 3. Collect shale samples 23 from the core (shale core) just taken from the well.

[0057] 4. Open the screw cap 20 and place the shale sample 23 in the sample basket 17.

[0058] 5. Screw on the screw cap 20.

[0059] 6. Place the sample transfer box containing the shale sample 23 onto the transport vehicle.

[0060] 7. During transportation to the laboratory, the pressure relief cover 22 can be pulled out and the temperature inside the box can be measured with a thermometer. If it is found that the temperature does not meet the required low temperature conditions, liquid nitrogen can be injected into the liquid nitrogen containing chamber 5 of the sample transfer box to maintain the low temperature inside the sample transfer box.

[0061] 8. After the sample arrives at the laboratory, the screw cap 20 of the sample transfer box containing the shale sample 23 is opened, and the shale sample 23 is taken out and analyzed.

[0062] 9. During the experiment, the sample transfer box can also be used as a low-temperature storage box for shale samples.

Claims

1. A sample transfer box, comprising a box body and a box cover, characterized in that: A liquid nitrogen containing chamber is provided in the box body, and the liquid nitrogen containing chamber is surrounded by a cooling top wall, a bottom wall and side walls, and a plurality of cooling holes are opened on the cooling top wall; a sample storage plate for placing samples is provided on the upper part of the cooling top wall, and the cooling holes are connected to the upper space of the sample storage plate through a cool air circulation channel; the projection of the sample storage plate in the up and down directions covers the cooling holes, and a liquid nitrogen drainage structure for redirecting the liquid nitrogen overflowing from the cooling holes into the liquid nitrogen containing chamber is also provided on the sample storage plate.

2. The sample transfer box according to claim 1, characterized in that: The outer edge of the sample storage plate is provided with a folded edge that folds downward, and the folded edge forms the liquid nitrogen drainage structure.

3. The sample transfer box according to claim 2, characterized in that: The sample storage plate is connected to the upper part of the cooling top wall through a support, and the cool air circulation channel includes a longitudinal interval between the cooling holes on the cooling top wall and the sample storage plate, and a transverse interval located outside the folded edge.

4. The sample transfer box according to claim 1, characterized in that: The cooling top wall is opposite to and spaced from the bottom wall of the box body, a side wall partition is arranged in the box body opposite to and spaced from the side wall of the box body, the bottom wall of the liquid nitrogen containing chamber is formed by a corresponding part of the bottom wall of the box body, the side wall of the liquid nitrogen containing chamber is formed by a corresponding part of the side wall partition, and a cold source storage tank is formed between the side wall partition and the corresponding side wall of the box body.

5. The sample transfer box according to claim 4, characterized in that: The side wall partition includes a non-porous portion for enclosing the liquid nitrogen containing chamber and a cooling portion connected to the non-porous portion, and the cooling portion is provided with cooling air circulation holes for cooling air generated by a cooling source in a cooling source storage tank to flow through.

6. The sample transfer box according to claim 4, characterized in that: Two rows of frozen bottles are placed in the cold source storage tank along the up and down directions, and each row of frozen bottles includes a plurality of frozen bottles continuously arranged along the inner side wall of the box body.

7. The sample transfer box according to claim 1, characterized in that: The box body is provided with a liquid nitrogen filling pipe for filling liquid nitrogen into the liquid nitrogen containing cavity.

8. The sample transfer box according to any one of claims 1 to 6, characterized in that: A sample basket is placed on the upper part of the sample storage plate, and a ventilation hole is opened on the basket body of the sample basket.

9. The sample transfer box according to claim 1, characterized in that: The box cover is provided with a sealing structure for sealing the box body opening, and the box cover is provided with a pressure relief hole, in which a pressure relief cover is installed.

10. The sample transfer box according to claim 9, characterized in that: The box cover is provided with a lofting hole and a lofting cover which is sealed with the lofting hole.

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