Digestion constant volume device and method

Abstract

The invention discloses a digestion constant volume device and method, and relates to the technical field of wet digestion and constant volume of mineral samples. The digestion constant volume device comprises an operating platform and a moving mechanism, the operating platform is provided with a heating area, a weighing area, a feeding and discharging area, a liquid adding area and a cooling area, the heating area is used for heating and digesting the container added with acid, the weighing area is used for measuring the weight of the container, the feeding and discharging area is used for placing a container added with a sample and a container added with water for constant volume, and the cooling area is used for cooling the container. The liquid adding area is used for adding acid or water into the container, and the cooling area is used for cooling the heated container; the moving mechanism comprises a fence and a moving clamping jaw, the fence is arranged on the operation platform, and the moving clamping jaw is arranged on the fence and used for driving the container to move among the heating area, the weighing area, the feeding and discharging area, the liquid adding area and the cooling area. The digestion constant-volume operation of the digestion constant-volume device provided by the invention is completed by moving the clamping jaw to carry the container, and manual direct participation is not needed, so that the operation safety is remarkably improved, and meanwhile, the working efficiency is also greatly improved.

Description

Technical Field

[0001] This application relates to the technical field of wet digestion and volume fixation of mineral samples, and particularly relates to a digestion and volume fixation device and method. Background Art

[0002] As a common sample pretreatment method, the wet digestion method of ores is widely used in fields such as geological analysis, environmental monitoring, and materials science research. The basic process of this method is to weigh an ore sample into a specific container, such as a beaker, conical flask, or polytetrafluoroethylene beaker with excellent corrosion resistance, and then add an acid solution mixed in a specific ratio. By heating, a chemical reaction occurs in the ore sample, gradually transforming from a solid state to a liquid state for subsequent detection and analysis.

[0003] In the prior art, the wet digestion method mostly relies on manual operation. For example, it is necessary to manually transfer the container to add the acid solution; then manually place the container after adding the acid on an electric furnace for heating; after the heating process is completed, it is also necessary to manually move the container to a cooling area for cooling. These operations not only involve the handling of high temperatures and strong acidic substances, posing safety hazards, but also manual operation is time-consuming and laborious, thus reducing the overall operation efficiency. Summary of the Invention

[0004] In view of this, this application provides a digestion and volume fixation device and method, aiming to solve one of the technical problems in the prior art.

[0005] To achieve the above object, the technical solution adopted in this application is as follows:

[0006] In a first aspect, an embodiment of this application provides a digestion and volume fixation device, including:

[0007] An operation platform, provided with a heating area, a weighing area, a loading and unloading area, a liquid adding area, and a cooling area. The heating area is used to heat and digest the container after adding acid, the weighing area is used to measure the weight of the container, the loading and unloading area is used to place the container with the added sample and the container after adding water for volume fixation, the liquid adding area is used to add acid or water to the container, and the cooling area is used to cool the heated container;

[0008] A moving mechanism, including a fence and a moving gripper. The fence is arranged on the operation platform, and the moving gripper is arranged on the fence and is used to drive the container to move between the heating area, the weighing area, the loading and unloading area, the liquid adding area, and the cooling area.

[0009] In one embodiment of the first aspect, the digestion and volume - fixing device further includes a volume - fixing mechanism. The volume - fixing mechanism includes an electronic scale, a liquid - adding pump, and a control circuit. The electronic scale and the liquid - adding pump are respectively electrically connected to the control circuit. The electronic scale is disposed in the weighing area, and the output end of the liquid - adding pump is disposed in the liquid - adding area. The control circuit controls the flow rate of the liquid - adding pump according to the weighing result of the electronic scale.

[0010] In one embodiment of the first aspect, the volume - fixing mechanism further includes a heating component. The heating component is disposed in the heating area and is electrically connected to the control circuit. The control circuit also controls the heating time of the heating component according to the weighing result of the electronic scale.

[0011] In one embodiment of the first aspect, a liquid - adding port is provided in the liquid - adding area. An outlet conduit is provided at the outlet of the liquid - adding pump. The moving mechanism further includes a telescopic component. The telescopic component is disposed on the enclosure. The output end of the telescopic component is connected to the outlet conduit, and the liquid - adding port is disposed on the outlet conduit.

[0012] In one embodiment of the first aspect, the number of the telescopic components is at least two. The liquid - adding ports of at least one telescopic component are used for adding water, and the liquid - adding ports of at least one telescopic component are used for adding acid;

[0013] The number of the liquid - adding pumps is at least two. At least one liquid - adding pump is used for pumping water, and at least one liquid - adding pump is used for pumping acid.

[0014] In one embodiment of the first aspect, the loading and unloading area and the cooling area are spaced apart. The weighing area and the heating area are disposed between the loading and unloading area and the cooling area. Both the loading and unloading area and the cooling area are provided with a plurality of container placement positions.

[0015] In one embodiment of the first aspect, the control circuit and the liquid - adding pump are disposed on the side of the operation platform away from the moving mechanism, and the control circuit and the liquid - adding pump are respectively provided with protective covers.

[0016] In one embodiment of the first aspect, the digestion and volume - fixing device further includes an air - extraction mechanism. The air - extraction mechanism is disposed on the side of the enclosure away from the operation platform. The air - extraction mechanism, the enclosure, and the operation platform define an operation space. The heating area, the weighing area, the loading and unloading area, the liquid - adding area, and the cooling area are all disposed in the operation space. The air - extraction mechanism is used for sucking the gas in the operation space.

[0017] In a second aspect, an embodiment of the present application further provides a digestion and volume - fixing method, which is implemented by using the digestion and volume - fixing device in any of the above - mentioned embodiments, and includes:

[0018] Add the sample to be tested into a container for weighing, and then add acid into the container for the first time;

[0019] Heat the container for a preset fixed time for the first digestion. After the first digestion is completed, cool the container, weigh it after cooling, calculate the dynamic heating time according to the weighing result, and perform the second digestion;

[0020] After the second digestion is completed, cool the container. After cooling, add acid for the second time, heat the container for a preset fixed time for the third digestion, and when the heating time is up, the digestion is completed.

[0021] In one of the embodiments of the second aspect, after the digestion is completed, add water to the solution in the container to make up the volume, including:

[0022] Obtain the estimated density of the digested solution;

[0023] Collect the real-time weight data of the solution, calculate the weight m of the remaining substance by combining the weight before adding acid and the weight of the added sample, calculate the volume of the remaining solution in the digestion according to v = m / ρ, where ρ is the estimated density of the digested solution, and then determine the volume of water to be added according to the volume requirement for making up the volume;

[0024] Affected by the estimated density and the stability of the weighing value, there is a deviation between the calculated value and the actual value. Obtain an optimal compensation value to compensate for the deviation and determine the final volume of water to be added.

[0025] Compared with the prior art, the beneficial effect of the present application is that the present application provides a digestion and volume-making device, including an operation platform and a moving mechanism. The operation platform is provided with a heating area, a weighing area, a loading and unloading area, a liquid adding area and a cooling area. The heating area is used to heat and digest the container after adding acid, the weighing area is used to measure the weight of the container, the loading and unloading area is used to place the container with the added sample and the container after adding water to make up the volume, the liquid adding area is used to add acid or water to the container, and the cooling area is used to cool the heated container; the moving mechanism includes a fence and a moving gripper. The fence is arranged on the operation platform, and the moving gripper is arranged on the fence and is used to drive the container to move between the heating area, the weighing area, the loading and unloading area, the liquid adding area and the cooling area. During the entire process of the digestion and volume-making operation, only the loading and unloading tasks are manually performed, while other digestion and volume-making operations are completed by the moving gripper carrying the container, without direct manual participation. This process not only significantly improves the safety of the operation, but also greatly improves the work efficiency. Description of the Drawings

[0026] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0027] Figure 1 Shows a front structural schematic diagram of the digestion and constant volume device in some embodiments of the present application;

[0028] Figure 2 Shows a reverse structural schematic diagram of the digestion and constant volume device in some embodiments of the present application;

[0029] Figure 3 Shows a structural schematic diagram of the operation platform in some embodiments of the present application;

[0030] Figure 4 Shows a structural schematic diagram of the moving mechanism in some embodiments of the present application;

[0031] Figure 5 Shows a structural schematic diagram of the control circuit and the liquid adding pump in some embodiments of the present application;

[0032] Figure 6 Shows a flowchart of the digestion and constant volume method in some embodiments of the present application.

[0033] Main element symbol description: 100 - digestion and constant volume device; 110 - operation platform; 111 - heating area; 112 - weighing area; 113 - loading and unloading area; 114 - liquid adding area; 115 - cooling area; 120 - frame; 130 - moving mechanism; 1311 - first side baffle; 1312 - second side baffle; 1313 - third side baffle; 132 - moving gripper; 1321 - horizontal slide rail; 1322 - longitudinal slide rail; 1323 - vertical slide rail; 1324 - opening and closing member; 141 - liquid adding pump; 142 - control circuit; 143 - electronic scale; 133 - telescopic assembly; 1331 - cylinder; 1332 - fixing bracket; P1 - container placement position; 150 - protective cover; 160 - air extraction mechanism; 161 - top cover; 162 - air extraction pipe; 163 - air extraction pump; 200 - container. Detailed description of the specific implementation

[0034] The following will describe in detail the embodiments of the present application. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application and should not be construed as limiting the present application.

[0035] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0036] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0037] In the present application, unless otherwise clearly defined and limited, the terms such as "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0038] In the present application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0039] The purpose of mineral digestion is to dissolve all or as much as possible of the target elements in the mineral sample into the solution for subsequent determination. Wet digestion dissolves the sample by adding acids (such as hydrochloric acid, nitric acid, hydrofluoric acid, etc.).

[0040] In the prior art, wet digestion methods mostly rely on manual operations. For example, it is necessary to manually transfer containers to add acid solution; then manually place the acid-added containers on an electric furnace for heating; after the heating process is completed, it is also necessary to manually move the containers to a cooling area for cooling. These operations not only involve the handling of high temperatures and strong acidic substances, posing safety hazards, but also are time-consuming and laborious for manual operations, thus reducing the overall operation efficiency.

[0041] To address the above problems, as Figures 1 to 3 shown, an embodiment of the present application provides a digestion and volume-fixing device 100, which is mainly used to automatically move the container 200 for digestion and volume-fixing operations. The digestion and volume-fixing device 100 includes an operation platform 110 and a moving mechanism 130.

[0042] Among them, the operation platform 110 is provided with a heating area 111, a weighing area 112, a loading and unloading area 113, a liquid adding area 114, and a cooling area 115. The heating area 111 is used to heat and digest the acid-added container 200, the weighing area 112 is used to measure the weight of the container 200, the loading and unloading area 113 is used to place the container 200 containing the sample and the container 200 after water addition and volume-fixing, the liquid adding area 114 is used to add acid or water to the container 200, and the cooling area 115 is used to cool the heated container 200.

[0043] The moving mechanism 130 includes a fence and a moving gripper 132. The fence is arranged on the operation platform 110, and the moving gripper 132 is arranged on the fence and is used to drive the container 200 to move between the heating area 111, the weighing area 112, the loading and unloading area 113, the liquid adding area 114, and the cooling area 115. The container 200 is moved to the liquid adding area 114 by the moving gripper 132 to add acid, the acid-added container 200 is moved to the heating area 111 to heat and digest the sample in the container 200, the heated and digested container 200 is moved to the cooling area 115 to be cooled to room temperature, the cooled container 200 is moved to the weighing area 112 to be weighed, and then the weighed container 200 is moved to the liquid adding area 114 to add water for volume-fixing.

[0044] Throughout the entire process of digestion and volume-fixing operations, only the loading and unloading tasks are performed manually (specifically, the container 200 containing the mineral sample is placed in the loading and unloading area 113 by an operator, and then the operator transfers the container 200 that has completed the volume-fixing process), while other digestion and volume-fixing operations are completed by the moving gripper 132 carrying the container 200, without direct manual participation. This process not only significantly improves the safety of the operation, but also greatly improves the work efficiency.

[0045] In one embodiment, as Figure 4As shown in the figure, the enclosure includes a first side baffle 1311, a second side baffle 1312, and a third side baffle 1313. The three side baffles are vertically arranged on the operation platform 110 and enclose the heating area 111, the weighing area 112, the loading and unloading area 113, the liquid adding area 114, and the cooling area 115 within the three side baffles.

[0046] The moving gripper 132 includes a three-way moving member and an opening and closing member 1324. The three-way moving member includes a transverse slide rail 1321, two longitudinal slide rails 1322, and a vertical slide rail 1323.

[0047] The transverse slide rail 1321 and the two longitudinal slide rails 1322 are arranged in a plane parallel to the operation platform 110. The end of the transverse slide rail 1321 is slidably arranged on the longitudinal slide rail 1322, enabling the transverse slide rail 1321 to move along the width direction of the operation platform 110. The vertical slide rail 1323 is vertically arranged with respect to the operation platform 110 and is movably arranged on the transverse slide rail 1321. The opening and closing member 1324 is slidably arranged on the vertical slide rail 1323, enabling the opening and closing member 1324 to move along the direction perpendicular to the operation platform 110, the length direction of the operation platform 110, and the width direction of the operation platform 110.

[0048] Correspondingly, the opening / closing action of the opening and closing member 1324 is used to release / pick up the container 200.

[0049] It can be understood that by arranging the moving gripper 132 on the enclosure, it is convenient to limit the moving gripper 132 within the space enclosed by the enclosure, shorten the moving stroke of the moving gripper 132, and improve the operation efficiency. In addition, it can also simplify the structure of the moving mechanism 130, make the structure of the moving mechanism 130 more compact, and reduce the volume.

[0050] Constant volume means transferring the digested solution to a volumetric flask and adding a solvent (such as deionized water) until the preset volume is reached, thereby obtaining a uniform concentration.

[0051] Generally, the operation process of constant volume is as follows: Add an appropriate amount of deionized water to the volumetric flask to make the solution close to the calibration line of the volumetric flask (usually about 2 / 3 of the total volume), and shake the volumetric flask to initially mix the solution. Use a dropper or a micropipette to add deionized water drop by drop until the liquid level just touches the calibration line of the volumetric flask. At this time, the eyes should be kept level with the calibration line to ensure that the line of sight is perpendicular to the calibration line and avoid parallax errors. Such an operation process of constant volume has low efficiency.

[0052] In view of the above problems, in some embodiments, the digestion and constant volume device 100 further includes a constant volume mechanism.

[0053] Among them, as Figures 1 to 3As shown in the figure, the constant volume mechanism includes an electronic scale 143, a liquid addition pump 141, and a control circuit 142. The electronic scale 143 and the liquid addition pump 141 are electrically connected to the control circuit 142 respectively. The electronic scale 143 is arranged in the weighing area 112, and the output end of the liquid addition pump 141 is arranged in the liquid addition area 114. The control circuit 142 controls the flow rate of the liquid addition pump 141 according to the weighing result of the electronic scale 143.

[0054] In one embodiment, the liquid addition pump 141 is a peristaltic pump, which consists of one or more rollers and at least one flexible hose. When the rollers rotate, they squeeze the hose, forcing the fluid in it to move forward. Since the fluid only contacts the hose, the peristaltic pump has the characteristics of being pollution-free and easy to clean.

[0055] The electronic scale 143 uses an electronic balance or a weight sensor to input the weight data signal to the control circuit 142. In some embodiments, a display screen may also be arranged to be electrically connected to the electronic scale 143 for displaying the weighing structure, facilitating the user to read.

[0056] The container is weighed by the electronic scale 143, and the control circuit 142 calculates the volume of the solvent to be added according to the weighing result to complete the constant volume process. In this process, there is no need to rely on the scale line on the container 200 for the constant volume operation, significantly improving the efficiency of constant volume.

[0057] In order to make the target components in the sample be released more fully, or to improve the sensitivity and accuracy of detection, the sample after the first digestion will be further processed, such as adding acid and heating the digested solution again.

[0058] In some embodiments, the constant volume mechanism further includes a heating component, which is arranged in the heating area 111 and is electrically connected to the control circuit 142. The control circuit 142 also controls the first, second, and third heating times of the heating component according to the weighing result of the electronic scale 143.

[0059] In one embodiment, the heating component is an electric furnace, and the control circuit 142 can calculate the heating time and heating temperature of the first, second, and third digestions according to the weighing result, facilitating multiple digestions of minerals.

[0060] In some embodiments, a liquid addition port is arranged in the liquid addition area 114, and a liquid outlet conduit is arranged at the outlet of the liquid addition pump 141. The moving mechanism 130 further includes a telescopic component 133, which is arranged on the enclosure. The output end of the telescopic component 133 is connected to the liquid outlet conduit, and the liquid addition port is arranged on the liquid outlet conduit.

[0061] As Figure 1As shown, the telescopic assembly 133 includes a cylinder 1331 and a fixing bracket 1332. The fixing bracket 1332 is connected to the output end of the cylinder 1331. One end of the liquid outlet conduit is connected to the peristaltic pump, and the other end is connected to the fixing bracket 1332. The telescopic direction of the output end of the cylinder 1331 can be set as required. For example, in Figure 1 the telescopic direction of the cylinder 1331 is the left - right direction.

[0062] In some embodiments, the number of the telescopic assemblies 133 is at least two. The liquid adding port of at least one telescopic assembly 133 is used for adding water, and the liquid adding port of at least one telescopic assembly 133 is used for adding acid.

[0063] The number of the liquid adding pumps 141 is at least two. At least one liquid adding pump 141 is used for pumping water, and at least one liquid adding pump 141 is used for pumping acid.

[0064] Exemplarily, as Figure 2 shown, the number of the telescopic assemblies 133 is two. The liquid adding port of one telescopic assembly 133 is used for adding water, and the liquid adding port of one telescopic assembly 133 is used for adding acid. In other embodiments, multiple liquid outlet ports can be set according to different types of acidic substances. For example, the liquid outlet port for hydrochloric acid, the liquid outlet port for nitric acid, the liquid outlet port for hydrofluoric acid, the liquid outlet port for aqua regia, etc.

[0065] Each liquid adding pump 141 is used for pumping one kind of liquid, avoiding the mixing of the residual acidic substances in the liquid outlet conduit with the acidic substances used in the experiment and affecting the accuracy of the sample test. One liquid adding pump 141 is used for pumping water to make up the volume of the solution after digestion is completed, and the remaining liquid adding pumps 141 are used for adding acid to digest the sample.

[0066] In some embodiments, the loading - unloading area 113 and the cooling area 115 are arranged at intervals. The weighing area 112 and the heating area 111 are arranged between the loading - unloading area 113 and the cooling area 115. Both the loading - unloading area 113 and the cooling area 115 are provided with a plurality of container placement positions P1.

[0067] As Figure 3 shown, the loading - unloading area 113 is arranged outside the operation platform 110, facilitating the loading - unloading operation. The weighing area 112 and the heating area 111 are arranged inside the loading - unloading area 113, shortening the moving stroke of the moving gripper 132 and improving the operation efficiency. The cooling area 115 is arranged at the innermost side of the operation platform 110. The container 200 that needs to be cooled and left standing for a long time is placed at the innermost side of the operation platform 110, reducing the situation that the moving gripper 132 knocks down the container 200 and enhancing the safety of the operation. Such a layout method divides the operation platform 110 into dynamic and static areas according to the moving line of the moving gripper 132, making the functional areas of the operation platform 110 reasonable and improving the operation efficiency.

[0068] As Figure 1 and Figure 3Moreover, the liquid adding area 114 is arranged on the left side of the weighing area 112, separating electronic devices such as the heating assembly and the electronic scale 143 from the liquid adding area 114, preventing acid solution from dripping or volatilizing onto the electronic devices and damaging them.

[0069] It can be understood that corrosion-resistant partitions are also provided above electronic devices such as the heating assembly and the electronic scale 143 for protection, facilitating maintenance.

[0070] As Figure 3 shown, a plurality of circular grooves are provided in both the loading and unloading area 113 and the cooling area 115. The circular grooves are container placement positions P1, and the container placement positions P1 are arranged at intervals along the length direction of the operation platform 110, increasing the number of container placement positions P1. By increasing the number of container placement positions P1, the operation efficiency of the digestion and volume fixing device 100 is improved.

[0071] For example, Figure 3 in, the loading and unloading area 113 has 10 container placement positions P1, and the cooling area 115 has 19 container placement positions P1. It can be understood that the mineral sample needs to be heated and digested before weighing or volume fixing, and it takes a long time to cool the container 200. By increasing the number of container placement positions P1, 19 containers 200 can be cooled simultaneously, significantly improving the operation efficiency.

[0072] It should be noted that the numbers of the heating area 111 and the weighing area 112 can be set as required. For example, Figure 1 in, the numbers of both the heating area 111 and the weighing area 112 are two.

[0073] In some embodiments, as Figure 1 , 2 and 5 shown, the control circuit 142 and the liquid adding pump 141 are arranged on the side of the operation platform 110 away from the moving mechanism 130, and the control circuit 142 and the liquid adding pump 141 are respectively provided with protective covers 150.

[0074] As Figures 1 to 3 shown, the digestion and volume fixing device 100 further includes a frame 120. The operation platform 110 is arranged on the frame 120, and a receiving space is provided below the operation platform 110. By arranging the control circuit 142 and the liquid adding pump 141 on the side of the operation platform 110 away from the moving mechanism 130, the corrosive damage of the volatile acidic substances and the gases generated during the digestion process to the control circuit 142 and the liquid adding pump 141 is reduced, and the receiving space of the frame 120 can be reasonably utilized.

[0075] In one embodiment, the material of the protective cover 150 of the liquid addition pump 141 is PVC board, and the material of the protective cover 150 of the control circuit 142 board is 316L stainless steel sprayed plastic. Correspondingly, the frame 120, the operation platform 110, the electronic scale 143, the partition of the heating component, the fixing frame 1332, and the enclosure are all made of corrosion-resistant materials, or a corrosion-resistant coating is sprayed on the surface of the structure to extend the service life of the digestion and volume-fixing device 100.

[0076] During the digestion and volume-fixing process, strong acids are usually used to digest samples. Some strong acids are volatile, and harmful gases are generated during the digestion process, which will cause harm to the human body during long-term operation.

[0077] In view of the above problems, in some embodiments, the digestion and volume-fixing device 100 further includes an air extraction mechanism 160. The air extraction mechanism 160 is arranged on the side of the enclosure away from the operation platform 110. The air extraction mechanism 160, the enclosure and the operation platform 110 define an operation space. The heating area 111, the weighing area 112, the loading and unloading area 113, the liquid addition area 114 and the cooling area 115 are all arranged in the operation space. The air extraction mechanism 160 is used to suck the gas in the operation space.

[0078] The air extraction mechanism 160 includes a top cover 161, an air extraction pipe 162 and an air extraction pump 163. As Figure 1 shown, the top cover 161 is covered above the enclosure, so that the harmful gases generated during the digestion and volume-fixing process are retained in the operation space, reducing the harm caused by the escape of harmful gases from the operation space to the health of the operator. The air extraction pump 163 extracts the harmful gases in the operation space, and after being harmlessly treated by external equipment, they are discharged, reducing air pollution.

[0079] As Figure 6 shown, the present application also provides a digestion and volume-fixing method, which is realized by using the digestion and volume-fixing device 100 in any of the above embodiments, including:

[0080] Step S10, adding the sample to be tested into the container 200 for weighing, and then adding acid for the first time into the container 200.

[0081] Specifically, an operator manually loads a mineral sample with a preset weight into the container 200 and places it in the loading and unloading area 113. The moving gripper 132 picks up the container 200 and moves it to the corresponding liquid addition port in the liquid addition area 114, and the liquid addition pump 141 pumps in an acidic substance with a preset weight.

[0082] Step S20, heating the container 200 for a preset time for the first digestion. After the first digestion is completed, cool the container 200, weigh it after cooling, calculate the dynamic heating time according to the weighing result, and perform the second digestion.

[0083] Specifically, after the addition of acid is completed, the moving gripper 132 moves the container 200 to the heating zone 111 for the first heating digestion. After the first digestion is completed, the moving gripper 132 moves the container 200 to the cooling zone 115 for cooling. After the cooling is completed, the moving gripper 132 moves the container 200 to the weighing zone 112 for weighing.

[0084] Step S30: After the second digestion is completed, the container 200 is cooled. After cooling, acid is added for the second time, and the container 200 is heated for a preset fixed time for the third digestion. When the heating time reaches the end, the digestion is completed.

[0085] Specifically, after weighing is completed, the moving gripper 132 moves the container 200 to the heating zone 111. The control circuit 142 calculates the heating time for the second digestion based on the weighing result and controls the heating component to heat the container 200 for the second digestion. After the digestion is completed, the moving gripper 132 moves the container 200 to the cooling zone 115 for cooling.

[0086] Specifically, after cooling is completed, the moving gripper 132 moves the container 200 to the corresponding liquid addition port in the liquid addition zone 114, and the liquid addition pump 141 pumps in a preset weight of acidic substance for the second acid addition.

[0087] The moving gripper 132 moves the container 200 to the heating zone 111 and heats the container 200 for a preset fixed time for the third digestion.

[0088] In some embodiments, after the digestion is completed, water is added to the solution in the container 200 for constant volume, including:

[0089] Step S41: Obtain the estimated density of the digested solution.

[0090] According to the data of the sample to be measured (ρ, e), that is, the relationship between the preset density ρ and the actual constant volume deviation e, a linear regression model is fitted. The gradient descent method is used to find the parameters (θ0, θ1) to minimize the loss function; that is:

[0091]

[0092] Among them, F θ (ρ i ) = θ0 + θ1ρ i ;

[0093] According to the gradient descent strategy, the parameters are iteratively updated and solved. μ is the learning rate:

[0094]

[0095] Finally, a ρ* is determined as the best estimated density, and this best estimated density is the estimated density of the solution, so that the constant volume deviation e* satisfies: e *= F θ (ρ * ) = θ0 + θ1ρ * <ε。

[0096] In step S42, real-time weight data is collected, and the weight m of the remaining substance is calculated by combining the weight before acid addition and the sample addition weight. The volume of the remaining solution in the digestion is calculated according to v = m / ρ, where ρ is the estimated density of the solution after digestion. Then, the volume of water to be added is determined according to the volume requirement for volume fixation.

[0097] In step S43, affected by the estimated density and the stability of the weighing value, there is a deviation between the calculated value and the actual value, and an optimal compensation value is obtained to compensate for the deviation.

[0098] Using the experimental sample data (c, e), that is, the relationship between the preset compensation value c and the actual volume fixation deviation e, a linear regression model is fitted to determine an optimal compensation value c^* to compensate for the volume of water added, and the final volume of water added is determined. The volume fixation accuracy after compensation can reach +0.2 ml, meeting the volume fixation requirements of the laboratory.

[0099] The control circuit 142 controls the flow rate of the liquid addition pump 141 according to the final volume of water added.

[0100] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0101] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A digestion and volume setting device, characterized in that: include: The operating platform is provided with a heating area, a weighing area, a loading and unloading area, a liquid adding area and a cooling area. The heating area is used to heat and digest the container after acid addition, the weighing area is used to measure the weight of the container, the loading and unloading area is used to place the container added with the sample and the container after adding water to the fixed volume, the liquid adding area is used to add acid or water to the container, and the cooling area is used to cool the heated container; The moving mechanism includes an enclosure and a moving clamp, wherein the enclosure is arranged on the operating platform, and the moving clamp is arranged on the enclosure and is used to drive the container to move between the heating area, the weighing area, the loading and unloading area, the liquid adding area and the cooling area.

2. The digestion and volume setting device according to claim 1, characterized in that: The digestion and volume setting device also includes a volume setting mechanism, which includes an electronic scale, a liquid adding pump and a control circuit. The electronic scale and the liquid adding pump are electrically connected to the control circuit respectively. The electronic scale is arranged in the weighing area, and the output end of the liquid adding pump is arranged in the liquid adding area. The control circuit controls the flow rate of the liquid adding pump according to the weighing result of the electronic scale.

3. The digestion and volume setting device according to claim 2, characterized in that: The constant volume mechanism also includes a heating component, which is arranged in the heating area and electrically connected to the control circuit. The control circuit also controls the heating time of the heating component according to the weighing result of the electronic scale.

4. The digestion and volume setting device according to claim 2, characterized in that: The liquid adding area is provided with a liquid adding port, the outlet of the liquid adding pump is provided with a liquid outlet conduit, the moving mechanism also includes a telescopic component, the telescopic component is arranged on the enclosure, the output end of the telescopic component is connected to the liquid outlet conduit, and the liquid adding port is arranged on the liquid outlet conduit.

5. The digestion and volume setting device according to claim 4, characterized in that: The number of the telescopic components is at least two, at least one of the liquid adding ports of the telescopic components is used for adding water, and at least one of the liquid adding ports of the telescopic components is used for adding acid; The number of the liquid adding pumps is at least two, at least one of the liquid adding pumps is used for pumping water, and at least one of the liquid adding pumps is used for pumping acid.

6. The digestion and volume setting device according to any one of claims 1 to 5, characterized in that: The loading and unloading areas and the cooling area are arranged at intervals, the weighing area and the heating area are arranged between the loading and unloading areas and the cooling area, and the loading and unloading areas and the cooling area are both provided with a plurality of container placement positions.

7. The digestion and volume setting device according to any one of claims 2 to 5, characterized in that: The control circuit and the liquid adding pump are arranged on a side of the operating platform away from the moving mechanism, and the control circuit and the liquid adding pump are respectively provided with protective covers.

8. The digestion and volume setting device according to any one of claims 1 to 5, characterized in that: The digestion and volume determination device also includes an exhaust mechanism, which is arranged on a side of the enclosure away from the operating platform. The exhaust mechanism, the enclosure and the operating platform define an operating space. The heating zone, the weighing zone, the loading and unloading zone, the liquid adding zone and the cooling zone are all arranged in the operating space. The exhaust mechanism is used to suck the gas in the operating space.

9. A digestion and volume setting method, implemented by using the digestion and volume setting device according to any one of claims 1 to 8, characterized in that: include: The sample to be tested is added to the container and weighed, and then acid is added to the container for the first time; The container is heated for a preset fixed time to perform the first digestion. After the first digestion is completed, the container is cooled and weighed after cooling. The dynamic heating time is calculated according to the weighing result, and the second digestion is performed; After the second digestion, the container is cooled, and then acid is added for the second time. The container is heated for a preset fixed time for the third digestion. When the heating time is up, the digestion is completed.

10. The digestion and volume determination method according to claim 9, characterized in that: After digestion is complete, add water to the solution in the container to make up the volume, including: Obtain the estimated density of the digestion-completed solution; Collect the real-time weight data of the solution, combine the weight before acid addition and the added weight to calculate the weight m of the remaining substance, calculate the volume of the remaining solution in the digestion according to v=m / ρ, ρ is the estimated density of the solution after digestion, and then determine the volume of water to be added according to the fixed volume requirement; Affected by the estimated density and the stability of the weighing value, there is a deviation between the calculated value and the actual value. An optimal compensation value is obtained to compensate for the deviation and determine the final water addition volume.

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