A device for measuring the biodegradability of plastics in an anaerobic environment

Abstract

The present invention relates to the technical field of chemical measurement equipment, and in particular to a device for measuring the biodegradability of plastics in an anaerobic environment, comprising a thermostatic box and a plurality of culture vessels arranged in the thermostatic box, wherein the thermostatic box comprises a box body and a cover body, and each culture vessel comprises a culture vessel base and an upper sealing cover; a one-way air inlet pipe and an air outlet pipe are arranged on the top of the upper sealing cover, an air supply unit and a gas adsorption measurement unit are arranged on the cover body, a retaining ring is arranged in the air outlet pipe, a first air outlet hole connected to the thermostatic box and a first air outlet pipe connected to the gas adsorption measurement unit are arranged on the air outlet pipe, and a blocking valve core is arranged in the air outlet pipe. The test environment in each culture vessel of the present technical solution can exclude the influence of ambient temperature, atmospheric pressure changes and water vapor on the measurement, and the blocking valve core can change its position to control the flow direction of the gas in the culture vessel to avoid direct discharge to the outside.

Description

Technical Field

[0001] The invention relates to the technical field of chemical measuring equipment, in particular to a device for measuring the biodegradability of plastics in an anaerobic environment. Background Art

[0002] At present, the degree of biodegradation of biodegradable plastics or polymers in an anaerobic environment is one of the important indicators for evaluating the biodegradability of plastics. Plastics and other organic matter are degraded by microorganisms in an anaerobic environment to produce CH4 and CO2, also known as biogas. The method for determining anaerobic biodegradability is to use a gas measuring device to accurately measure the volume of biogas generated during the degradation process, and calculate the biodegradability of the test material using the measured total volume of biogas and the theoretical carbon content of the plastic. At present, most of the test devices for anaerobic biodegradation tests are homemade laboratory measuring devices. The total volume of biogas is calculated by displacing the volume of liquid in the measuring cylinder by the biogas generated during the biodegradation process. Since the liquid is in direct contact with the atmospheric environment, the entire measurement system is an open system, resulting in a large amount of carbon dioxide in the biogas dissolving in water and then escaping into the air, resulting in inaccurate measurements. Homemade devices also often ignore the influence of atmospheric pressure changes on the measurement and the interference of water vapor on the measurement, which ultimately leads to large errors in the data results and poor repeatability of experimental data. Summary of the invention

[0003] In view of the above problems, it is necessary to provide a device for measuring the biodegradability of plastics in an anaerobic environment to address the problems of the prior art.

[0004] In order to solve the problems of the prior art, the technical solution adopted by the present invention is:

[0005] A device for measuring the biodegradability of plastics in an anaerobic environment comprises a thermostatic box and a plurality of culture vessels arranged in the thermostatic box, the thermostatic box comprising a box body and a cover body, each culture vessel comprising a culture vessel base mounted on the box body and opening upward, and an upper sealing cover mounted on the bottom of the cover body and opening downward; a one-way air inlet pipe and an air outlet pipe located on both sides of the axis of the upper sealing cover are arranged on the top of the upper sealing cover, the top ends of the one-way air inlet pipe and the air outlet pipe extend to the upper side of the cover body, an air supply unit and a gas adsorption measurement unit are arranged on the cover body, and an output end of the air supply unit is connected to the top end of the one-way air inlet pipe; a retaining ring surrounding the inner wall is arranged in the air outlet pipe, a first air outlet hole connected to the thermostatic box is arranged below the retaining ring, a first air outlet pipe connected to the gas adsorption measurement unit is arranged above the retaining ring, and a blocking valve core for controlling the air outlet direction is arranged in the air outlet pipe; an exhaust pipe connected to the inside of the box body is arranged on the thermostatic box, and the exhaust pipe is connected to an exhaust device to exhaust gas in the box body.

[0006] Preferably, a first spring is provided in the air outlet pipe, the first spring is located below the blocking valve core and pushes the blocking valve core to move up and fit the retaining ring, an extension sleeve is provided at the axis of the blocking valve core, an air guide pipe is inserted in the extension sleeve, and the air guide pipe moves along the axial direction of the extension sleeve; a bottom limit plate is coaxially provided at the bottom end of the air guide pipe, a middle limit plate is provided in the middle of the air guide pipe, the diameter of the bottom limit plate is larger than the diameter of the air guide pipe, the diameter of the middle limit plate is smaller than the inner diameter of the retaining ring, a second air outlet hole extending radially along the air guide pipe is provided above the bottom limit plate of the air guide pipe, and a third air outlet hole extending radially along the air guide pipe is provided above the middle limit plate of the air guide pipe; when the air guide pipe moves up to the bottom of the first spring of the bottom limit plate that fits the blocking valve core, the straight-line distance between the second air outlet hole and the bottom limit plate is smaller than the straight-line distance between the middle limit plate and the top of the blocking valve core.

[0007] Preferably, a top limit plate is coaxially arranged at the top of the air guide pipe, an outer slide groove extending radially along the air outlet pipe is arranged at the top of the air outlet pipe, a card block and a second spring are arranged in the outer slide groove, the card block is slidably installed in the outer slide groove, and the elastic force of the second spring pushes the card block to move along the outer slide groove toward the axis of the air outlet pipe; the distance between the bottom of the card block and the top of the air outlet pipe is the same as the thickness of the top limit plate, and an inclined surface is arranged on the upper side of one end of the card block below the top limit plate.

[0008] Preferably, a circular installation cavity is provided on one side of the one-way air inlet pipe located at the upper part of the upper sealing cover, and an air intake impeller is rotatably installed in the installation cavity. The axis of the air intake impeller is horizontally arranged, and the blades of the air intake impeller are in contact with the inner wall of the one-way air inlet pipe when they rotate to a horizontal state; one end of the installation cavity located inside the upper sealing cover is connected to the inner seat, and the inner seat is fixedly installed on the top end inside the upper sealing cover, and a mounting sleeve is provided below the inner seat on the same axis as the one-way air inlet pipe; a rotating tube is coaxially sleeved on the outside of the installation sleeve, and a conical air outlet with a downwardly reduced diameter is provided at the bottom of the rotating tube, and a plurality of stirring blades vertically inserted into the base of the incubator are provided on the outside of the rotating tube; a plugging core moving along the axis direction of the rotating tube is provided in the rotating tube, and the plugging core has the same taper as the conical air outlet.

[0009] Preferably, a central axis is coaxially arranged in the rotating tube, and the central axis extends to the outer side of the top of the upper sealing cover, and the central axis is connected to the inner wall of the rotating tube through a plurality of radially extending connecting arms on the circumferential side, and a first bevel gear is coaxially mounted on one end of the central axis located outside the upper sealing cover, and a second bevel gear meshingly connected to the first bevel gear is rotatably mounted on the top of the upper sealing cover, and the axis of the second bevel gear is horizontally arranged and parallel to the axis of the intake impeller; a rotating shaft extending to the outside of the one-way intake pipe is arranged at the axis of the intake impeller, a first synchronous wheel is coaxially mounted on one end of the rotating shaft, and a second synchronous wheel is coaxially mounted on one end of the second bevel gear, and the first synchronous wheel and the second synchronous wheel are connected by a synchronous belt.

[0010] Preferably, a ratchet wheel is coaxially mounted on one end of the rotating shaft away from the first synchronous wheel, and ratchet teeth meshing with the ratchet wheel are arranged on the outside of the one-way air intake pipe.

[0011] Preferably, the box body includes an outer box and an inner box, an insulation chamber is provided between the outer box and the inner box, a water outlet pipe is provided at the bottom of the outer box, a water inlet pipe is provided at the side of the outer box, and the exhaust pipe extends from the outside of the outer box to the inner box; a horizontal mounting frame plate is provided inside the outer box, and a plurality of mounting holes for placing the base of the incubator are provided on the mounting frame plate.

[0012] Preferably, the plug is provided with a guide hole which is in the same straight line with the central axis, the central axis is inserted in the guide hole, the inner diameter of the guide hole is the same as the diameter of the central axis, and a third spring is sleeved on the central axis, the third spring elastically connects the connecting arm and the plug, and the elastic force of the third spring causes the plug to move down to fit the conical air outlet; an extension rod extending vertically downward is provided at the bottom of the plug; a lifting seat which moves in the vertical direction is slidably installed at the bottom of the constant temperature box, and a number of push rods which are in the same straight line with the middle limit plate are provided on the lifting seat, the push rods pass through the outer box and the inner box and are inserted in the guide sleeves provided at the bottom of the incubator base, and when the lifting seat fits the bottom of the outer box, the push rods fit the bottom of the extension rod, pushing the plug to move up to release the conical air outlet at the bottom of the rotating tube.

[0013] Preferably, a ball bearing is rotatably mounted on the bottom of the extension rod.

[0014] Preferably, the air supply unit includes a plurality of air supply pipes connected to the output end of the air source, the air supply pipes are horizontally arranged, and a plurality of first connecting ports for connecting to the top of the one-way air inlet pipe are arranged at the bottom of the air supply pipe. The air supply pipe is provided with an insertion hole above the first connecting port, and a piston column is vertically inserted in the insertion hole. The insertion hole and the piston column have a cross-section with the same shape and size as the one-way air inlet pipe.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] First, when the cover body and the box body in the present invention are tightly closed, the upper sealing cover and the culture vessel base form a sealed culture vessel, and each culture vessel has an independent air inlet and outlet structure and a corresponding gas control and processing mechanism, so that each culture vessel can maintain a relatively independent and stable test environment, eliminating the influence of ambient temperature, atmospheric pressure changes and water vapor on the measurement, thereby ensuring that the test result data is standardized and highly comparable.

[0017] Secondly, the blocking valve core in the present invention can flexibly move and change its position, thereby accurately controlling the flow direction of the gas in the culture vessel. During gas detection, the gas is allowed to enter the gas adsorption measurement unit, and after the detection is completed, it can be discharged into the constant temperature box. This precise gas flow control can not only realize the gas detection and analysis process in an orderly manner, but also avoid improper mixing of external gas with the gas in the culture vessel. This makes the entire gas detection process more scientific and standardized.

[0018] Thirdly, when the gas in the present invention enters the one-way air inlet pipe, it drives the air inlet impeller to rotate around its axis. The rotation of the air inlet impeller drives the rotating tube to rotate, and the stirring blades outside the rotating tube stir the plastic samples and microorganisms and other materials in the incubator base as the rotating tube rotates, so that the inert gas can be more evenly diffused among the materials, accelerate the discharge of oxygen, and quickly create an anaerobic environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a stereoscopic diagram of a device for measuring the biodegradability of plastics in an anaerobic environment;

[0020] Figure 2 It is a side view of a device for measuring the biodegradability of plastics in an anaerobic environment;

[0021] Figure 3 It is a device for measuring the biodegradability of plastics in an anaerobic environment. Figure 2 AA direction cross-sectional view;

[0022] Figure 4 yes Figure 3 A partial enlarged view of point B;

[0023] Figure 5 yes Figure 3 A three-dimensional cross-sectional view of

[0024] Figure 6 yes Figure 5 A partial enlarged view of point C;

[0025] Figure 7 It is a device for measuring the biodegradability of plastics in an anaerobic environment. Figure 2 AA direction cross-sectional view

[0026] Figure 8 yes Figure 7 A partial enlarged view of point D;

[0027] Fig. 9 yes Figure 7 A local enlarged view of point E;

[0028] Fig.10It is a three-dimensional structural exploded diagram of a device for measuring the biodegradability of plastics in an anaerobic environment;

[0029] Fig.11 The invention is a three-dimensional device for measuring the biodegradability of plastics in an anaerobic environment, which includes an upper sealing cover and a gas adsorption measuring unit. Figure 1 ;

[0030] Fig.12 The invention is a three-dimensional device for measuring the biodegradability of plastics in an anaerobic environment, which includes an upper sealing cover and a gas adsorption measuring unit. Figure 2 .

[0031] The numbers in the figure are: 1, constant temperature box; 11, box body; 111, exhaust pipe; 112, outer box; 113, inner box; 114, insulation chamber; 115, water outlet pipe; 116, water inlet pipe; 117, mounting frame; 118, mounting hole; 12, cover body; 13, lifting seat; 131, top rod; 2, incubator base; 21, guide sleeve; 3, upper sealing cover; 31, one-way air inlet pipe; 311, mounting chamber; 312, air inlet impeller; 313, inner seat; 314, mounting sleeve; 315, rotating shaft; 316, first synchronous wheel; 317, synchronous belt; 318, ratchet; 319, ratchet; 32, air outlet pipe; 321, retaining ring; 322, first air outlet hole; 323, first air outlet pipe; 324, plugging valve core; 325, The first spring; 326, extension sleeve; 33, air guide tube; 331, bottom limit plate; 332, middle limit plate; 333, second air outlet; 334, third air outlet; 335, top limit plate; 34, outer slide groove; 341, block; 342, second spring; 35, rotating tube; 351, conical air outlet; 352, stirring blade; 353, central axis; 354, connecting arm; 355, first bevel gear; 356, second bevel gear; 357, second synchronous wheel; 358, third spring; 36, plugging core; 361, guide hole; 362, extension rod; 363, ball; 4, air supply unit; 41, air supply pipe; 411, first connecting port; 412, insertion hole; 413, piston column; 5, gas adsorption measurement unit. DETAILED DESCRIPTION

[0032] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] Reference Figures 1 to 12 :

[0034] A device for measuring the biodegradability of plastics in an anaerobic environment comprises a thermostat 1 and a plurality of culture vessels arranged in the thermostat 1. The thermostat 1 comprises a box body 11 and a cover body 12. Each culture vessel comprises a culture vessel base 2 installed in the box body 11 and opening upward, and an upper sealing cover 3 installed at the bottom of the cover body 12 and opening downward; a one-way air inlet pipe 31 and an air outlet pipe 32 located on both sides of the axis of the upper sealing cover 3 are arranged on the top of the upper sealing cover 3, and the top ends of the one-way air inlet pipe 31 and the air outlet pipe 32 extend to the upper side of the cover body 12, and an air supply unit 4 and a gas supply unit 4 are arranged on the cover body 12. The adsorption measurement unit 5 and the output end of the air supply unit 4 are connected to the top of the one-way air inlet pipe 31; a baffle ring 321 surrounding the inner wall is provided in the air outlet pipe 32, and a first air outlet hole 322 connected to the constant temperature box 1 is provided below the baffle ring 321; the air outlet pipe 32 is provided with a first air outlet pipe 323 connected to the gas adsorption measurement unit 5 above the baffle ring 321, and a blocking valve core 324 for controlling the air outlet direction is provided in the air outlet pipe 32; the constant temperature box 1 is provided with an exhaust pipe 111 connected to the inside of the box body 11, and the exhaust pipe 111 is connected to the exhaust device to extract the gas in the box body 11.

[0035] When the measuring device of the present invention is used, the plastic sample to be tested for biodegradability is first placed in the incubator base 2. Then the thermostat 1 is closed so that the cover 12 and the box 11 are tightly closed. At this time, the upper sealing cover 3 and the incubator base 2 form a sealed culture space, which is ready for the subsequent creation of an anaerobic environment and the biodegradation test of plastics. The air supply unit 4 starts to work and injects inert gas such as nitrogen, argon, etc. into the one-way air inlet pipe 31, and the inert gas enters the culture space along the one-way air inlet pipe 31. As the inert gas is continuously filled, the original air in the culture space including oxygen will be gradually discharged, and the oxygen in the culture vessel will be discharged in this way, thereby creating an environment suitable for anaerobic biodegradation of plastics. In this process, the blocking valve core 324 of the outlet pipe 32 is in the initial position, so that the gas mainly enters the thermostat 1 through the first outlet hole 322 on the outlet pipe 32, and does not enter the gas adsorption measurement unit 5. When it is necessary to detect the gas generated by degradation, the blocking valve core 324 changes its position, and the blocking valve core 324 can block the first air outlet 322 connected to the thermostat 1, and at the same time open the channel leading to the gas adsorption measurement unit 5, so that the gas accumulated in the culture vessel enters the gas adsorption measurement unit 5 through the first air outlet pipe 323. The gas adsorption measurement unit 5 uses corresponding adsorbents, sensors and other components to adsorb and analyze the incoming gas, for example, by adsorbing carbon dioxide through a specific chemical adsorbent, and by detecting changes in related physical and chemical parameters, to determine the composition, content and other information of the gas, which is then used to calculate the biodegradability of the plastic. After the gas detection is completed, the blocking valve core 324 is reset again, and the first air outlet 322 leading to the inside of the thermostat 1 is reopened. At this time, the remaining gas in the culture vessel is discharged to the inside of the thermostat 1 through the first air outlet 322. Subsequently, the gas supply unit 4 injects gas into the culture vessel to discharge the gas generated by the test into the thermostat 1, thereby preventing the potentially harmful degradation gas remaining in the culture vessel from being absorbed by the human body when the culture vessel is subsequently opened, thereby ensuring the health and safety of the operator. Each culture vessel in the present embodiment has an independent gas inlet and outlet structure and a corresponding gas control and processing mechanism, so that each culture vessel can maintain a relatively independent and stable test environment, eliminating the influence of ambient temperature, atmospheric pressure changes and water vapor on the measurement, thereby ensuring that the test result data is standard and highly comparable. The plugging valve core 324 can flexibly move and change its position, thereby accurately controlling the flow direction of the gas in the culture vessel. During gas detection, the gas is allowed to enter the gas adsorption measurement unit 5, and after the detection is completed, it can be discharged to the inside of the thermostat 1. This precise gas flow control can not only realize the process of gas detection and analysis in an orderly manner, but also avoid improper mixing of external gas with the gas in the culture vessel. The entire gas detection process is made more scientific and standardized.

[0036] In order to achieve the purpose of changing the gas flow direction by the plugging valve core 324, the following features are specifically set:

[0037] A first spring 325 is provided in the air outlet pipe 32. The first spring 325 is located below the blocking valve core 324 to push the blocking valve core 324 to move up and fit the retaining ring 321. An extension sleeve 326 is provided at the axis of the blocking valve core 324. The air guide pipe 33 is inserted in the extension sleeve 326. The air guide pipe 33 moves along the axis of the extension sleeve 326. A bottom limiting plate 331 is coaxially provided at the bottom end of the air guide pipe 33. A middle limiting plate 332 is provided in the middle of the air guide pipe 33. The diameter of the bottom limiting plate 331 is larger than the diameter of the air guide pipe 33. The middle limiting plate 332 The diameter of the air guide tube 33 is smaller than the inner diameter of the retaining ring 321, and the air guide tube 33 is provided with a second air outlet hole 333 extending radially along the air guide tube 33 above the bottom limiting plate 331, and the air guide tube 33 is provided with a third air outlet hole 334 extending radially along the air guide tube 33 above the middle limiting plate 332; when the air guide tube 33 moves up to the bottom of the first spring 325 which is in contact with the bottom limiting plate 331 and blocks the valve core 324, the straight-line distance between the second air outlet hole 333 and the bottom limiting plate 331 is smaller than the straight-line distance between the middle limiting plate 332 and the top of the blocking valve core 324.

[0038] When the first spring 325 in the present embodiment is in a naturally extended state, its upward elastic force pushes the blocking valve core 324 to move upward, so that the blocking valve core 324 is tightly fitted with the retaining ring 321, and the first air outlet 322 is released. At this time, the air guide tube 33 is located in the extension sleeve 326, and the bottom limit plate 331 at the bottom end of the air guide tube 33 fits the bottom of the extension sleeve 326. The second air outlet 333 is located in the extension sleeve 326 and is blocked. The gas entering the air outlet pipe 32 can only be discharged into the constant temperature box 1 through the first air outlet 322. When it is necessary to detect the gas generated by the degradation of plastic in the culture vessel, the staff applies a downward force to the air guide tube 33 to move the air guide tube 33 downward along the axial direction of the extension sleeve 326. During the downward movement of the air guide tube 33, after the middle limit plate 332 fits the top of the blocking valve core 324, the blocking valve core 324 moves downward under the push of the air guide tube 33 to overcome the elastic force of the first spring 325, thereby blocking the first air outlet 322. Since the straight-line distance between the second air outlet 333 and the bottom limit plate 331 is smaller than the straight-line distance between the middle limit plate 332 and the top of the blocking valve core 324, the second air outlet 333 is located below the extension sleeve 326 at this time, and the gas in the culture vessel can enter the air guide tube 33 through the second air outlet 333, and then enter the gas adsorption measurement unit 5 through the third air outlet 334 and the first air outlet tube 323, and the gas adsorption measurement unit 5 can analyze and detect the composition and content of the gas to determine the biodegradability of the plastic.

[0039] In order to fix the position of the air guide tube 33, the following features are specifically provided:

[0040] A top limit plate 335 is coaxially arranged at the top of the air guide pipe 33, and an outer slide groove 34 extending radially along the air outlet pipe 32 is arranged at the top of the air outlet pipe 32. A block 341 and a second spring 342 are arranged in the outer slide groove 34. The block 341 is slidably installed in the outer slide groove 34, and the elastic force of the second spring 342 pushes the block 341 to move along the outer slide groove 34 toward the axial direction of the air outlet pipe 32; the distance between the bottom of the block 341 and the top of the air outlet pipe 32 is the same as the thickness of the top limit plate 335, and an inclined surface is arranged on the upper side of one end of the block 341 located below the top limit plate 335.

[0041] The air guide tube 33 is inserted into the extension sleeve 326 of the blocking valve core 324, and maintains its position through damping. When the air guide tube 33 needs to move down, the staff can press the top limit plate 335 of the air guide tube 33 to move it down to the inclined surface that contacts the top of the block 341. Due to the guiding effect of the inclined surface, the block 341 moves along the outer slide groove 34 away from the axis of the outlet pipe 32, compressing the second spring 342. After the top limit plate 335 completely passes over the block 341, the block 341 rebounds under the elastic force of the second spring 342 and blocks the top limit plate 335. At this time, the position of the air guide tube 33 is fixed, and the gas is kept flowing to the gas adsorption measurement unit 5. After the gas detection is completed, the staff pushes the block 341 to overcome the elastic force of the second spring 342 and move it along the outer slide groove 34 away from the axis of the outlet pipe 32, releases the top limit plate 335, and pulls the air guide tube 33 to move up and reset.

[0042] In order to ensure the one-way air intake effect of the one-way air intake pipe 31, the following features are specifically set:

[0043] A circular mounting cavity 311 is provided on one side of the one-way air inlet pipe 31 located at the upper part of the upper sealing cover 3, and an air inlet impeller 312 is rotatably mounted in the mounting cavity 311, and the axis of the air inlet impeller 312 is horizontally arranged, and the blades of the air inlet impeller 312 are fitted against the inner wall of the one-way air inlet pipe 31 when they rotate to a horizontal state; one end of the mounting cavity 311 located inside the upper sealing cover 3 is connected to an inner seat 313, and the inner seat 313 is fixedly mounted on the top end inside the upper sealing cover 3, and a mounting sleeve 314 which is on the same axis as the one-way air inlet pipe 31 is provided below the inner seat 313; a rotating tube 35 is coaxially sleeved on the outside of the mounting sleeve 314, and a conical air outlet 351 with a diameter decreasing downward is provided at the bottom of the rotating tube 35, and a plurality of stirring blades 352 which are vertically inserted into the incubator base 2 are provided on the outside of the rotating tube 35; a plugging core 36 which moves along the axis direction of the rotating tube 35 is provided inside the rotating tube 35, and the plugging core 36 has the same taper as the conical air outlet 351.

[0044] The air supply unit 4 in this embodiment starts to work and delivers inert gas to the one-way air inlet pipe 31. When the gas enters the one-way air inlet pipe 31, it can drive the air inlet impeller 312 to rotate, so that the gas can smoothly pass through the one-way air inlet pipe 31 into the culture space. In this process, the plugging core 36 in the rotating tube 35 is in a higher position, and the conical air outlet 351 is not blocked. The gas can enter the rotating tube 35 and enter the area of ​​the culture base 2 from the conical air outlet 351 at the bottom thereof, and begin to replace the air in the culture vessel to create an anaerobic environment. When the anaerobic environment is created, the conical air outlet 351 is blocked by the plugging core 36 to prevent the generated gas from entering the rotating tube 35 and the one-way air inlet pipe 31, affecting the accuracy of the detection.

[0045] In order to achieve the purpose that when the gas enters the one-way air inlet pipe 31, the rotating pipe 35 can automatically rotate to drive the stirring blade 352 to stir the material, the following features are specifically set:

[0046] A central shaft 353 is coaxially arranged in the rotating tube 35, and the central shaft 353 extends to the outer side of the top of the upper sealing cover 3. The central shaft 353 is connected to the inner wall of the rotating tube 35 through a plurality of radially extending connecting arms 354 on the circumferential side. A first bevel gear 355 is coaxially mounted on one end of the central shaft 353 located outside the upper sealing cover 3, and a second bevel gear 356 meshingly connected to the first bevel gear 355 is rotatably mounted on the top of the upper sealing cover 3, and the axis of the second bevel gear 356 is horizontally arranged and parallel to the axis of the intake impeller 312; a rotating shaft 315 extending to the outside of the one-way intake pipe 31 is arranged at the axis of the intake impeller 312, a first synchronous wheel 316 is coaxially mounted on one end of the rotating shaft 315, a second synchronous wheel 357 is coaxially mounted on one end of the second bevel gear 356, and the first synchronous wheel 316 and the second synchronous wheel 357 are connected by a synchronous belt 317.

[0047] In this embodiment, when the gas enters the one-way air inlet pipe 31, the air inlet impeller 312 rotates around its axis. The rotating shaft 315 of the air inlet impeller 312 drives the first synchronous wheel 316 to rotate synchronously, and through the transmission of the synchronous belt 317, the second synchronous wheel 357 rotates accordingly, thereby driving the second bevel gear 356 to rotate. Since the second bevel gear 356 is meshed with the first bevel gear 355, the first bevel gear 355 drives the central shaft 353 to rotate, and the central shaft 353 drives the rotating tube 35 to rotate through the connecting arm 354. The conical air outlet 351 at the bottom of the rotating tube 35 sprays the gas, and at the same time, the stirring blades 352 on the outside thereof stir the plastic samples and microorganisms and other materials in the incubator base 2 as the rotating tube 35 rotates, so that the inert gas can be more evenly diffused between the materials, accelerate the discharge of oxygen, and quickly create an anaerobic environment.

[0048] In order to ensure the unidirectional rotation effect of the intake impeller 312, the following features are specifically set:

[0049] A ratchet wheel 318 is coaxially mounted on one end of the rotating shaft 315 away from the first synchronous wheel 316 , and a ratchet tooth 319 meshing with the ratchet wheel 318 is disposed outside the one-way air inlet pipe 31 .

[0050] In this embodiment, the ratchet 318 coaxially installed at one end of the rotating shaft 315 away from the first synchronous wheel 316 and the ratchet 319 meshing with the ratchet 318 are arranged on the outside of the one-way air inlet pipe 31 to ensure that the air inlet impeller 312 can only rotate in one direction, so that the gas can only enter the culture vessel through the one-way air inlet pipe 31.

[0051] In order to maintain a suitable experimental environment for the culture vessel in the incubator 1, the following features are specifically set:

[0052] The box body 11 includes an outer box 112 and an inner box 113, and an insulation chamber 114 is provided between the outer box 112 and the inner box 113. A water outlet pipe 115 is provided at the bottom of the outer box 112, a water inlet pipe 116 is provided on the side of the outer box 112, and an exhaust pipe 111 extends from the outside of the outer box 112 to the inside of the inner box 113; a horizontal mounting frame plate 117 is provided in the outer box 112, and a plurality of mounting holes 118 for placing the culture device base 2 are provided on the mounting frame plate 117.

[0053] This embodiment can effectively block the influence of the external environment temperature on the experimental environment in the inner box 113 by setting the outer box 112, the inner box 113 and the insulation chamber 114 in the middle, and by using the circulation or filling of water in the insulation chamber 114. The large specific heat capacity of water makes its own temperature change relatively small when absorbing or releasing a certain amount of heat, so the temperature in the inner box 113 can be kept relatively stable for a long time, ensuring that the microorganisms can degrade the plastic sample at a suitable and constant temperature at all times, thereby improving the accuracy and repeatability of the experimental results and creating ideal temperature conditions for accurately measuring the biodegradability of plastics in an anaerobic environment. Placing the culture vessel in the mounting hole 118 of the mounting frame plate 117 can better fix the position of the culture vessel than placing it at random at the bottom of the inner box 113, and avoid accidents such as the culture vessel tipping over and colliding due to vibration and movement of the device.

[0054] In order to achieve the purpose that the plugging core 36 can release and block the conical air outlet 351, the following features are specifically set:

[0055] The plugging core 36 is provided with a guide hole 361 which is in the same straight line as the central axis 353. The central axis 353 is inserted into the guide hole 361. The inner diameter of the guide hole 361 is the same as the diameter of the central axis 353. The central axis 353 is sleeved with a third spring 358, which elastically connects the connecting arm 354 and the plugging core 36. The elastic force of the third spring 358 causes the plugging core 36 to move downward to fit the conical air outlet 351. The bottom of the plugging core 36 is provided with an extension rod 358 which extends vertically downward. 62; A lifting seat 13 that moves in the vertical direction is slidably installed at the bottom of the constant temperature box 1, and a plurality of push rods 131 that are in the same straight line with the middle limit plate 332 are arranged on the lifting seat 13. The push rods 131 pass through the outer box 112 and the inner box 113 and are inserted into the guide sleeve 21 arranged at the bottom of the incubator base 2. When the lifting seat 13 fits against the bottom of the outer box 112, the push rods 131 fit against the bottom of the extension rod 362, pushing the plugging core 36 to move upward to release the conical air outlet 351 at the bottom of the rotating tube 35.

[0056] In this embodiment, when no operation is performed, the third spring 358 is in a naturally extended state, and its elastic force acts on the plugging core 36, so that the plugging core 36 moves down along the central axis 353 until the plugging core 36 is tightly attached to the conical air outlet 351 at the bottom of the rotating tube 35, and the conical air outlet 351 is in a blocked state. After installing the cover 12, the staff moves the lifting seat 13 at the bottom of the incubator 1 upward until it is attached to the bottom of the outer box 112. At this time, the top rod 131 on the lifting seat 13 passes through the guide sleeve 21 set at the bottom of the incubator base 2 and fits the bottom of the extension rod 362, pushing the plugging core 36 to move upward to release the conical air outlet 351 at the bottom of the rotating tube 35. When the inert gas has exhausted all the oxygen, the staff moves the lifting seat 13 downward, and the top rod 131 only blocks the guide sleeve 21. The plugging core 36 blocks the conical air outlet 351 under the action of gravity and elastic force to prevent the gas generated during the experiment from entering the rotating tube 35.

[0057] In order to ensure that the push rod 131 does not affect the rotation of the rotating tube 35 when pushing the plug core 36 upward, the following features are specifically provided:

[0058] A ball bearing 363 is rotatably mounted on the bottom of the extension rod 362 .

[0059] In this embodiment, when the rotating tube 35 rotates, even if the plugging core 36 rotates with the rotating tube 35, the ball 363 installed at the bottom of the extension rod 362 rotates to fit the top of the top rod 131, which can also reduce friction and ensure smooth rotation.

[0060] In order to selectively allow the gas delivered by the gas delivery unit 4 to enter the culture vessel containing the material, the following features are specifically set:

[0061] The air supply unit 4 includes a plurality of air supply pipes 41 connected to the output end of the air source. The air supply pipes 41 are arranged horizontally. The bottom of the air supply pipes 41 are provided with a plurality of first connecting ports 411 for connecting to the top of the one-way air inlet pipe 31. The air supply pipe 41 is provided with an insertion hole 412 located above the first connecting port 411. A piston column 413 is vertically inserted in the insertion hole 412. The insertion hole 412 and the piston column 413 have a cross-section with the same shape and size as the one-way air inlet pipe 31.

[0062] When it is necessary to deliver gas to a specific culture vessel containing materials to create an anaerobic environment, the staff can manually pull up the piston column 413 and lift up the piston column 413 corresponding to the culture vessel that needs ventilation on the corresponding air supply pipe 41. After the piston column 413 moves up, the insertion hole 412 of the air supply pipe 41 is opened, so that the gas in the air supply pipe 41 can be connected to the corresponding one-way air inlet pipe 31 through the first connecting port 411 below it. The gas output by the gas source can enter the corresponding culture vessel along the air supply pipe 41, the first connecting port 411, and the one-way air inlet pipe 31, and start operations such as exhausting air to create an anaerobic environment.

[0063] Working principle: When in use, first place the plastic sample to be tested for biodegradability in the incubator base 2. Then close the thermostat 1, so that the cover 12 and the box 11 are tightly closed. At this time, the upper sealing cover 3 and the incubator base 2 form a sealed culture space, and warm water is injected into the thermostat 1 to maintain the experimental temperature. The air supply unit 4 starts to work and injects inert gas such as nitrogen, argon, etc. into the one-way air inlet pipe 31. The inert gas enters the culture space along the one-way air inlet pipe 31. As the inert gas is continuously filled in, the original air in the culture space, including oxygen, will be gradually discharged. In this process, the plugging valve core 324 of the outlet pipe 32 is in the initial position, so that the gas mainly enters the thermostat 1 through the first outlet hole 322 on the outlet pipe 32, and will not enter the gas adsorption measurement unit 5. When it is necessary to detect the gas generated by degradation, the blocking valve core 324 changes its position, and the blocking valve core 324 blocks the first air outlet 322 connected to the thermostat 1, and at the same time opens the passage to the gas adsorption measurement unit 5, so that the gas accumulated in the culture vessel enters the gas adsorption measurement unit 5 through the first air outlet pipe 323. The gas adsorption measurement unit 5 uses corresponding adsorbents, sensors and other components to adsorb and analyze the incoming gas and calculate the biodegradability of the plastic. After the gas detection is completed, the blocking valve core 324 is reset again, and the first air outlet 322 leading to the inside of the thermostat 1 is reopened. At this time, the remaining gas in the culture vessel is discharged into the inside of the thermostat 1 through the first air outlet 322. Subsequently, the exhaust device extracts the air containing these gases in the thermostat 1 through the exhaust pipe 111 and processes it.

[0064] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A device for measuring the biodegradability of plastics in an anaerobic environment, comprising a thermostat and a plurality of culture vessels arranged in the thermostat, characterized in that: The constant temperature box includes a box body and a cover body, and each culture vessel includes a culture base installed on the box body and opening upward, and an upper sealing cover installed on the bottom of the cover body and opening downward; The top of the upper sealing cover is provided with a one-way air inlet pipe and an air outlet pipe located on both sides of the axis of the upper sealing cover, the top ends of the one-way air inlet pipe and the air outlet pipe extend to the upper side of the cover body, the cover body is provided with an air supply unit and a gas adsorption measurement unit, and the output end of the air supply unit is connected to the top end of the one-way air inlet pipe; The air outlet pipe is provided with a retaining ring surrounding the inner wall, the air outlet pipe is provided with a first air outlet hole connected to the thermostatic box below the retaining ring, the air outlet pipe is provided with a first air outlet pipe connected to the gas adsorption measurement unit above the retaining ring, and a blocking valve core for controlling the air outlet direction is provided in the air outlet pipe; The constant temperature box is provided with an exhaust pipe connected to the inside of the box, and the exhaust pipe is connected to the exhaust device to extract the gas in the box; A first spring is arranged in the air outlet pipe, and the first spring is located below the blocking valve core to push the blocking valve core upward to fit the retaining ring. An extension sleeve is arranged at the axis of the blocking valve core, and an air guide pipe is inserted in the extension sleeve, and the air guide pipe moves along the axis direction of the extension sleeve; A bottom limit plate is coaxially arranged at the bottom end of the air guide tube, a middle limit plate is arranged in the middle of the air guide tube, the diameter of the bottom limit plate is larger than the diameter of the air guide tube, the diameter of the middle limit plate is smaller than the inner diameter of the retaining ring, a second air outlet hole extending radially along the air guide tube is arranged above the bottom limit plate, and a third air outlet hole extending radially along the air guide tube is arranged above the middle limit plate; When the air guide pipe moves up to the bottom limit plate to fit the bottom of the first spring of the blocking valve core, the straight-line distance between the second air outlet and the bottom limit plate is smaller than the straight-line distance between the middle limit plate and the top of the blocking valve core.

2. The device for measuring the biodegradability of plastics in an anaerobic environment according to claim 1, characterized in that: A top stop plate is coaxially arranged at the top of the air guide pipe, an outer slide groove extending radially along the air outlet pipe is arranged at the top of the air outlet pipe, a clamping block and a second spring are arranged in the outer slide groove, the clamping block is slidably installed in the outer slide groove, and the elastic force of the second spring pushes the clamping block to move along the outer slide groove toward the axial direction of the air outlet pipe; The distance between the bottom of the clamping block and the top of the air outlet pipe is the same as the thickness of the top limiting plate, and an inclined surface is arranged on the upper side of one end of the clamping block below the top limiting plate.

3. The device for measuring the biodegradability of plastics in an anaerobic environment according to claim 1, characterized in that: The one-way air inlet pipe is provided with a circular installation cavity on one side of the upper sealing cover, and an air inlet impeller is rotatably installed in the installation cavity. The axis of the air inlet impeller is horizontally arranged, and the blades of the air inlet impeller are attached to the inner wall of the one-way air inlet pipe when rotating to a horizontal state; One end of the installation cavity located inside the upper sealing cover is connected to the inner seat, the inner seat is fixedly installed on the top of the inner part of the upper sealing cover, and a mounting sleeve opening which is on the same axis as the one-way air inlet pipe is arranged below the inner seat; A rotating tube is coaxially sleeved outside the mounting sleeve, the bottom of the rotating tube has a tapered air outlet with a diameter that decreases downward, and a plurality of stirring blades are arranged outside the rotating tube and vertically inserted into the base of the incubator; A plugging core is arranged in the rotating tube and moves along the axial direction of the rotating tube. The plugging core has the same taper as the conical air outlet.

4. The device for measuring the biodegradability of plastics in an anaerobic environment according to claim 3, characterized in that: A central shaft is coaxially arranged in the rotating tube, and the central shaft extends to the outer side of the top of the upper sealing cover. The central shaft is connected to the inner wall of the rotating tube through a plurality of radially extending connecting arms on the circumferential side. A first bevel gear is coaxially installed at one end of the central shaft located outside the upper sealing cover. A second bevel gear meshing with the first bevel gear is rotatably installed on the top of the upper sealing cover. The axis of the second bevel gear is horizontally arranged and parallel to the axis of the intake impeller. A rotating shaft extending to the outside of the one-way intake pipe is arranged at the axis of the intake impeller, a first synchronous wheel is coaxially mounted on one end of the rotating shaft, a second synchronous wheel is coaxially mounted on one end of the second bevel gear, and the first synchronous wheel and the second synchronous wheel are connected by a synchronous belt.

5. The device for measuring the biodegradability of plastics in an anaerobic environment according to claim 4, characterized in that: A ratchet wheel is coaxially mounted on one end of the rotating shaft away from the first synchronous wheel, and ratchet teeth meshing with the ratchet wheel are arranged outside the one-way air intake pipe.

6. The device for measuring the biodegradability of plastics in an anaerobic environment according to claim 4, characterized in that: The box body comprises an outer box and an inner box, a heat preservation chamber is formed between the outer box and the inner box, a water outlet pipe is arranged at the bottom of the outer box, a water inlet pipe is arranged at the side of the outer box, and the air extraction pipe extends from the outside of the outer box to the inside of the inner box; A horizontal mounting frame plate is arranged inside the outer box, and a plurality of mounting holes for placing the incubator base are arranged on the mounting frame plate.

7. The device for measuring the biodegradability of plastics in an anaerobic environment according to claim 6, characterized in that: The plugging core is provided with a guide hole which is in the same straight line as the central axis, the central axis is inserted into the guide hole, the inner diameter of the guide hole is the same as the diameter of the central axis, a third spring is sleeved on the central axis, the third spring elastically connects the connecting arm and the plugging core, and the elastic force of the third spring causes the plugging core to move down to fit the conical air outlet; An extension rod extending vertically downward is provided at the bottom of the plugging core; A lifting seat that moves in the vertical direction is slidably installed at the bottom of the constant temperature box. The lifting seat is provided with a plurality of push rods that are in the same straight line with the middle limit plate. The push rods pass through the outer box and the inner box and are inserted into the guide sleeves provided at the bottom of the incubator base. When the lifting seat fits the bottom of the outer box, the push rods fit the bottom of the extension rod, pushing the plugging core upward to release the conical air outlet at the bottom of the rotating tube.

8. The device for measuring the biodegradability of plastics in an anaerobic environment according to claim 7, characterized in that: A ball bearing is rotatably mounted at the bottom of the extension rod.

9. The device for measuring the biodegradability of plastics in an anaerobic environment according to claim 1, characterized in that: The air supply unit includes a plurality of air supply pipes connected to the output end of the air source. The air supply pipes are arranged horizontally. The bottom of the air supply pipes is provided with a plurality of first connecting ports for connecting to the top of the one-way air inlet pipe. The air supply pipe is provided with an insertion hole above the first connecting port. A piston column is vertically inserted in the insertion hole. The insertion hole and the piston column have a cross-section with the same shape and size as the one-way air inlet pipe.

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