A special test tube cover for analyzing organic matter in soil

Abstract

The utility model discloses a special test tube cover for analyzing organic matter in soil, including a tube plug and a tube cap. The tube plug is arranged at the bottom of the tube cap. Both the tube plug and the tube cap are cylindrical. A truncated cone is arranged at the bottom of the tube plug. The maximum diameter of the truncated cone is equal to the inner diameter of the test tube. The diameter of the tube cap is larger than the outer diameter of the test tube. The tube plug, the truncated cone and the tube cap are provided with through vents. The special test tube cover for analyzing organic matter in soil in the utility model can ensure that the radial occupied space of the entire test tube cover is minimized, so that the test tubes in the wire cage can all be placed with the test tube cover, thereby improving the utilization rate, improving the detection efficiency and reducing the detection cost. The tube plug part extends into the test tube, and fits with the test tube through the truncated cone and the reinforcing ring, so that the entire tube cover is stably covered on the test tube, and the tube cover is not easy to fall off when shaking occurs. When the solution boils, the steam overflows from the vent, and there will be no backflow phenomenon, no impact on the precision and accuracy of the sample, and no contamination of the sample.

Description

Technical Field

[0001] The utility model relates to the technical field of experimental instruments, in particular to a special test tube cover for analyzing organic matter in soil. Background Art

[0002] NY / T 1121.6-2006 "Soil Testing Part 6: Determination of Soil Organic Matter", "Accurately weigh 0.05g to 0.5g of air-dried sample that has passed through a 0.25mm aperture sieve, place it in a hard test tube, and then accurately add 10.00mL 0.4mol / L potassium dichromate-sulfuric acid solution, shake well and insert a glass funnel into the mouth of each test tube. Insert the test tubes into the wire cage one by one, and then sink the wire cage into the oil bath pot that has been heated to 185℃~190℃ on the electric furnace, so that the liquid level in the tube is lower than the right oil level. The oil bath temperature is required to drop to 170℃~180℃ after being placed in. When the solution in the test tube boils, start timing. At this time, the electric furnace temperature must be controlled to prevent the solution from boiling violently. During this period, the wire cage can be gently lifted and shaken in the oil bath pot several times to make the liquid temperature uniform and maintain it at 170℃~180℃. After 5min±0.5min, lift the wire cage out of the oil bath pot, cool it for a while, and wipe off the oil liquid outside the test tube. ..."

[0003] When measuring large quantities of soil organic matter according to the NY / T 1121.6-2006 standard method, the following problems are faced:

[0004] ① Step "shake well and insert a glass funnel into each test tube mouth". Since the opening diameter of the glass funnel is larger than the size of the hard test tube, it cannot completely fill the test tube position of the wire cage after being inserted. The occupancy rate of the wire cage holes is less than 30% (the laboratory wire cage has 100 holes, and can only hold 25 samples, such as Figure 1 As shown in the figure). First, the testing efficiency is reduced. Four oil baths are required to test 100 samples. In addition, someone needs to be on hand to observe and time the test, which is time-consuming and laborious. Second, the testing cost is increased. When testing large quantities of samples, a blank sample must be brought with each oil bath (in order to avoid errors, the standard method requires double blank samples). The blank boiling time is used to time the test, which invisibly increases the number of sample tests.

[0005] ② In step "During this period, the wire cage can be gently lifted and shaken in the oil bath for several times to make the liquid temperature uniform", because the glass funnel is placed directly in the test tube without any fixation, the wire cage is very unstable during the process of lifting and shaking in the oil bath, resulting in higher requirements for operation.

[0006] ③ When the solution in the hard test tube boils, steam will overflow and condense on the outside of the glass funnel. When it reaches a certain amount, it will flow back into the sample. First, there are differences in the "backflow rate" between samples, which affects the precision and accuracy of the samples; second, it is easy to contaminate the samples, causing some samples to be scrapped and have to be re-sampled. Utility Model Content

[0007] The utility model aims to provide a special test tube cover for analyzing organic matter in soil, so as to solve the problems existing in the above-mentioned prior art.

[0008] To achieve the above purpose, the utility model provides the following solutions:

[0009] The utility model provides a special test tube cover for analyzing organic matter in soil, comprising a tube plug and a tube cap, wherein the tube plug is arranged at the bottom of the tube cap, the tube plug and the tube cap are both cylindrical, a truncated cone is arranged at the bottom of the tube plug, the maximum diameter of the truncated cone is equal to the inner diameter of the test tube, the diameter of the tube cap is larger than the outer diameter of the test tube, and the tube plug, the truncated cone and the tube cap are internally provided with through air outlet holes.

[0010] Preferably, a reinforcement ring is further provided on the tube plug between the tube cap and the truncated cone, and the diameter of the reinforcement ring is equal to the inner diameter of the test tube.

[0011] Preferably, the bottom diameter of the truncated cone is smaller than the top diameter.

[0012] Preferably, teeth are distributed on the periphery of the cylinder of the tube cap.

[0013] Preferably, two air outlet holes are provided.

[0014] Compared with the prior art, the utility model has achieved the following beneficial technical effects:

[0015] The utility model provides a special test tube cover for analyzing organic matter in soil. The diameter of the tube cap can be set to be slightly larger than the outer diameter of the test tube, so that the radial space occupied by the entire test tube cover can be minimized, so that the test tubes in the wire cage can all be placed with the test tube cover, thereby improving the utilization rate, improving the detection efficiency, and reducing the detection cost. The tube plug part extends into the test tube and fits with the test tube through the frustum and the reinforcement ring, so that the entire tube cover is stably covered on the test tube, and the tube cover is not easy to fall off when shaking. When the solution boils, the steam overflows from the vent hole, and there will be no backflow, which will not affect the precision and accuracy of the sample, and will not pollute the sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1It is a front view of a test tube cover specially used for analyzing organic matter in soil in the utility model;

[0018] Figure 2 It is a top view of the test tube cover specially used for analyzing organic matter in soil in the utility model;

[0019] In the figure: 1. pipe plug; 2. pipe cap; 3. frustum; 4. reinforcement ring; 5. air vent; 6. teeth. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] The utility model aims to provide a special test tube cover for analyzing organic matter in soil, so as to solve the problems existing in the prior art.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] The special test tube cover for analyzing organic matter in soil in this embodiment is as follows: Figure 1-Figure 2 As shown, it includes a tube plug 1 and a tube cap 2, the tube plug 1 is arranged at the bottom of the tube cap 2, the tube plug 1 and the tube cap 2 are both cylindrical, a frustum 3 is arranged at the bottom of the tube plug 1, the maximum diameter of the frustum 3 is equal to the inner diameter of the test tube, the diameter of the tube cap 2 is larger than the outer diameter of the test tube, and the tube plug 1, the frustum 3 and the tube cap 2 are internally provided with a through vent hole 5.

[0024] In this specific embodiment, a reinforcement ring 4 is further provided on the tube plug 1 between the tube cap 2 and the truncated cone 3 , and the diameter of the reinforcement ring 4 is equal to the inner diameter of the test tube.

[0025] In this specific embodiment, the bottom diameter of the truncated cone 3 is smaller than the top diameter.

[0026] In this specific embodiment, teeth 6 are distributed on the outer periphery of the column of the tube cap 2. The teeth 6 are arranged to facilitate holding the tube cap 2 and prevent it from slipping and falling.

[0027] In this specific embodiment, two vent holes 5 are provided, and the rest are solid, which increases the volume of the test tube cover and prevents the bottle cover from being sprayed out due to excessive pressure in the bottle when the solution boils. The vent holes 5 are provided to facilitate the overflow of steam when the solution boils.

[0028] In this specific embodiment, the bottle cap material is selected from acid-resistant, alkali-resistant, and high-temperature-resistant materials, such as hard glass.

[0029] In this embodiment, the diameter of the tube cap 2 can be set to be slightly larger than the outer diameter of the test tube, so that the radial space occupied by the entire test tube cover can be minimized, so that the test tubes in the wire cage can all be placed with the test tube cover, thereby improving the utilization rate, improving the detection efficiency, and reducing the detection cost. The tube plug 1 partially extends into the test tube, and fits with the test tube through the frustum 3 and the reinforcing ring 4, so that the entire tube cover is stably covered on the test tube, and the tube cover is not easy to fall off when shaking. When the solution boils, the steam overflows from the vent 5, and there will be no backflow, which will not affect the precision and accuracy of the sample, and will not contaminate the sample.

[0030] The utility model uses specific examples to illustrate the principle and implementation of the utility model. The above examples are only used to help understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, according to the idea of ​​the utility model, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the utility model.

Claims

1. A test tube cover for analyzing organic matter in soil, characterized in that: It includes a tube plug and a tube cap, wherein the tube plug is arranged at the bottom of the tube cap, and both the tube plug and the tube cap are cylindrical. A frustum is arranged at the bottom of the tube plug, and the maximum diameter of the frustum is equal to the inner diameter of the test tube. The diameter of the tube cap is larger than the outer diameter of the test tube. Through-through air vents are arranged inside the tube plug, the frustum and the tube cap.

2. The test tube cover for analyzing organic matter in soil according to claim 1, characterized in that: A reinforcement ring is also provided on the tube plug between the tube cap and the truncated cone, and the diameter of the reinforcement ring is equal to the inner diameter of the test tube.

3. The test tube cover for analyzing organic matter in soil according to claim 1, characterized in that: The bottom diameter of the truncated cone is smaller than the top diameter.

4. The test tube cover for analyzing organic matter in soil according to claim 1, characterized in that: The cylindrical periphery of the tube cap is distributed with teeth.

5. The test tube cover for analyzing organic matter in soil according to claim 1, characterized in that: There are two air outlet holes.

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