Sample division method and sample divider

Abstract

The present invention discloses a sample dividing method and a sample divider. The sample dividing method is used for the sample divider. The sample divider includes a feeding mechanism, a discharging mechanism, and a weighing mechanism. The method includes the following steps: obtaining the required weight of the sample and the allowable error range; starting the feeding mechanism to output the sample to the weighing mechanism until the weighing mechanism measures a weight change; starting the feeding mechanism to output the sample to the weighing mechanism to measure the total weight of the sample and the actual weight discharged each time; the feeding mechanism discharges the sample to the weighing mechanism in batches. Before each discharge of the sample, weigh and record the total weight of the sample obtained by the weighing mechanism last time and the weight of the sample actually discharged last time, establish a coefficient between the weight of the sample actually discharged last time and the supply parameters of the feeding mechanism, and control the weight of the sample discharged next time with the coefficient until the difference between the required weight and the total weight of the sample is within the allowable error range. The present invention can avoid sample adhesion and accurately divide the sample when supplying the sample.

Description

Technical Field

[0001] The present invention belongs to the technical field of sample distribution, and particularly relates to a sample splitting method and a sample splitter. Background Art

[0002] Previously, for sampling viscous substances and trace samples of homogenates, basically, spoons and other tools were used for manual sampling, and manual control was used for sample splitting and weighing, which required a lot of time and energy of operators and had low efficiency. The reason is that there is currently no device that can precisely control the sample splitting of viscous substances and homogenate samples. For example, in food safety testing, for samples with high viscosity such as honey, both sampling and precise sample splitting control are required, as well as high-precision weighing.

[0003] However, in current patents for viscous sample splitting, most of them only perform rapid sampling or rough sample splitting of a large number of viscous samples, without precise control over the separation of the samples. For example, the patent application with the application number 201810246142.4 discloses a viscous sample pipettor and its applicable method, which can be used for sampling and rough sample splitting of viscous samples in a mushy or solid state, but it cannot control the separation between the viscous sample and the pipettor, and the sample will adhere to the outlet of the pipettor and cannot all fall, thus unable to meet the need for precise control of high-precision accurate sample splitting and weighing of trace samples. Summary of the Invention

[0004] The present invention provides a sample splitting method and a sample splitter, aiming to solve the problem of difficult precise sampling during the splitting of viscous samples in the prior art.

[0005] The present invention adopts the following technical solutions:

[0006] A sample splitting method for a sample splitter, the sample splitter including a feeding mechanism, a discharging mechanism, and a weighing mechanism, the feeding mechanism being a screw conveyor mechanism or a push rod conveyor mechanism, the discharging mechanism including a discharge pipe connected to the outlet of the feeding mechanism and a discharging piston that can slide up and down and rotate or vibrate simultaneously within the discharge pipe, the method comprising the following steps:

[0007] S1. Obtain the required weight of the sample and the allowable error range;

[0008] S2. The feeding mechanism is started to output the sample to the weighing mechanism until the weighing mechanism detects a change in weight;

[0009] S3. The feeding mechanism is started to output the sample to the weighing mechanism to measure the total weight of the sample and the actual weight discharged each time;

[0010] S4. The feeding mechanism discharges the sample to the weighing mechanism in batches. Before each discharge of the sample, weigh and record the total weight of the sample obtained by the weighing mechanism in the previous time and the weight of the sample actually discharged in the previous time, establish a coefficient between the weight of the sample actually discharged in the previous time and the supply parameters of the feeding mechanism, and control the weight of the sample discharged in the next time with the coefficient until the difference between the required weight and the total weight of the sample is within the allowable error range.

[0011] As a further improvement of the technical solution of the present invention, the steps of S4 are specifically as follows:

[0012] S41. Calculate the coefficient between the weight of the sample actually discharged in the previous time and the supply parameters of the feeding mechanism;

[0013] S42. Obtain the single - time supply target weight value, calculate the supply parameters required for the next feeding of the feeding mechanism with the coefficient, and control the feeding mechanism to feed with the supply parameters;

[0014] S43. After the feeding of the current time is completed, calculate whether the difference between the required weight and the total weight of the sample is within the allowable error range. If so, complete the sample sub - sampling; if not, repeat S41 to S43.

[0015] As a further improvement of the technical solution of the present invention, in S41, the coefficient is:

[0016] In the formula, n is the number of times of discharging the sample in step S3, and n is greater than or equal to 2; m n is the actual weight of the sample discharged in the nth time; S n is the supply parameter of the feeding mechanism when discharging the sample in the nth time, and k n is the coefficient of the nth time.

[0017] As a further improvement of the technical solution of the present invention, in step S42, the obtaining of the single - time supply target weight value is specifically:

[0018] In the formula, P is the required weight, M n is the total weight of the sample measured by the weighing mechanism after the nth feeding, and Δm is the single - time supply target weight value.

[0019] As a further improvement of the technical solution of the present invention, in step S42, the calculation of the supply parameters required for the next feeding is:

[0020] In the formula, Δm is the single - time supply target weight value; k n is the coefficient of the feeding mechanism when discharging the sample in the nth time, and S n+1 is the supply parameter of the (n + 1)th time.

[0021] As a further improvement of the technical solution of the present invention, the supply parameter is the number of rotation turns of the screw conveyor mechanism or the pushing distance of the push rod conveyor mechanism.

[0022] As a further improvement of the technical solution of the present invention, after the feeding mechanism feeds, the supply parameter is recorded.

[0023] A sample splitter, comprising:

[0024] A feeding mechanism, which is a screw conveyor mechanism or a push rod conveyor mechanism;

[0025] A discharging mechanism, including a discharge pipe connected to the outlet of the feeding mechanism and a discharging piston that can slide up and down and rotate or vibrate simultaneously in the discharge pipe;

[0026] A weighing mechanism, located below the discharge pipe; and

[0027] A controller, including:

[0028] An input module, used for inputting the required weight of the sample and the allowable error range;

[0029] A weight acquisition module, used for acquiring the total weight of the sample measured by the weighing mechanism and calculating the actually discharged sample weight based on the total weight of the sample;

[0030] A parameter acquisition module, used for acquiring the feeding parameter of the feeding mechanism;

[0031] A coefficient calculation module, used for calculating the coefficient between the actually discharged sample weight last time and the supply parameter of the feeding mechanism according to the feeding parameter and the sample weight;

[0032] An output control module, used for controlling the weight of the sample discharged next time according to the coefficient;

[0033] A judgment module, used for judging whether the difference between the required weight and the total weight of the sample is within the allowable error range.

[0034] As a further improvement of the technical solution of the present invention, the output control module includes:

[0035] A target calculation module, used for acquiring the single - supply target weight value;

[0036] A parameter calculation module, used for calculating the supply parameter for the next discharge according to the single - supply target weight value and the coefficient;

[0037] An output module, controlling the supply mechanism to supply the sample according to the supply parameter.

[0038] As a further improvement of the technical solution of the present invention, the single - supply target weight value is:

[0039] In the formula, P is the required weight, M n is the total weight of the sample measured by the weighing mechanism after the n - th feeding, and Δm is the single - supply target weight value.

[0040] Compared with the prior art, the beneficial effects of the present invention are:

[0041] In the sample sub - sampling method of the present invention, the sample sub - sampler adopted has a discharging mechanism. The discharging piston of the discharging mechanism can discharge the discharged sample (viscous sample or powdery sample) by rotation or vibration, avoiding sample adhesion. And the weight of the next discharged sample is controlled by the coefficient between the actually discharged sample weight and the supply parameters of the feeding mechanism, improving the control accuracy during discharging. Finally, the difference between the required weight and the total weight of the sample is within the allowable error range, completing the accurate sub - sampling of the sample. Description of the Drawings

[0042] The following further describes the technology of the present invention in detail with reference to the drawings and specific embodiments:

[0043] Figure 1 is the flow chart of the sub - sampling method of the present invention;

[0044] Figure 2 is the flow chart of step S4 of the sub - sampling method of the present invention;

[0045] Figure 3 is the structural schematic diagram of an embodiment in which the sample sub - sampler of the present invention supplies viscous samples using a screw conveyor;

[0046] Figure 4 is Figure 3 the connection schematic diagram of the feeding pipe, screw conveyor and discharging pipe in the embodiment of

[0047] Figure 5 is the structural schematic diagram of an embodiment in which the sample sub - sampler of the present invention supplies viscous samples using a push - rod mechanism;

[0048] Figure 6 is the structural schematic diagram of an embodiment in which the sample sub - sampler of the present invention supplies powdery samples using a screw conveyor.

[0049] Reference Signs:

[0050] 1 - feeding mechanism; 11 - feeding pipe; 12 - screw conveyor; 13 - first rotary driver; 14 - feeding piston;

[0051] 2 - Discharging mechanism; 21 - Discharge pipe; 211 - Discharge port; 22 - Discharge piston; 24 - Pusher; 25 - Vibration device; 26 - Second rotary driver;

[0052] 3 - Weighing mechanism; 31 - Receiving container;

[0053] 4 - Sample container. Specific embodiments

[0054] The concept, specific structure and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments and the drawings, so as to fully understand the purpose, solution and effects of the present invention. It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The same reference numerals used throughout the drawings indicate the same or similar parts.

[0055] It should be noted that, unless otherwise specified, when a certain feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. In addition, the up, down, left, right, etc. descriptions used in the present invention are only relative to the mutual positional relationship of the components of the present invention in the drawings.

[0056] Referring to Figures 1 to 6 , a sample splitting method, wherein the sample splitter includes a feeding mechanism 1, a discharging mechanism 2 and a weighing mechanism 3.

[0057] Referring to Figures 3 to 6 , the feeding mechanism 1 is a screw conveyor mechanism or a push rod conveyor mechanism, which can continuously supply and convey viscous samples or powder samples, facilitating precise control.

[0058] Referring to Figures 3 to 6 , the discharging mechanism 2 includes a discharge pipe 21 connected to the outlet of the feeding mechanism 1 and a discharge piston 22 that can slide up and down and rotate or vibrate simultaneously in the discharge pipe 21, that is, the discharge piston 22 can rotate or vibrate (rotate when it is a viscous sample, vibrate when it is a powder sample) while sliding up and down in the discharge pipe 21. If there is a viscous sample or powder sample in the discharge pipe 21, the discharge piston 22 can push the viscous sample in the pipe downward and discharge it. And because the discharge piston 22 is rotating or vibrating, it can discharge the viscous sample or powder sample, thus avoiding adhesion during sample discharge and affecting the accuracy of sampling and weighing. It can be understood that the discharge piston 22 is circular, and the inner cross-section of the discharge pipe 21 is also circular, and the two match.

[0059] Referring to Figures 3 to 6 , the weighing mechanism 3 is used to weigh the weight of the discharged sample, so as to determine whether the splitting weight is reached according to the discharged weight.

[0060] Referring to Figure 1 , the method includes the following steps:

[0061] S1. Obtain the required weight P of the sample and the allowable error range. That is, determine that the actual weight of the sample to be obtained is P, and take this weight as the target, expecting the weight of the finally sub-sampled sample to be equal to this weight. Of course, due to the weighing accuracy, it is difficult to exactly obtain the sample weight that is finally equal to P during actual weighing. Therefore, there is an allowable error range. As long as the difference between the finally obtained sample weight and the required weight P is within this allowable error range, it can be said that the obtained sample weight meets the requirements. For example, the required weight P of the honey (i.e., the viscous sample) to be obtained is 10 g, and the allowable error range is plus or minus 0.05 g. That is, if the finally obtained sample weight is between 9.95 g and 10.05 g, it can be considered that the obtained sample weight meets the requirements.

[0062] S2. The feeding mechanism 1 is activated to output the sample to the weighing mechanism 3 until the weighing mechanism 3 measures a weight change. At the beginning, since the sample is in the sample container 4 and not in the feeding mechanism 1 and the discharging mechanism 2, it is necessary to first convey and fill the feeding mechanism 1 and the discharging mechanism 2 so that subsequent feeding and sub-sampling can be more accurate. To determine whether the feeding mechanism 1 and the discharging mechanism 2 are filled, it can be confirmed according to the weighing mechanism 3. At the beginning, when the feeding mechanism 1 and the discharging mechanism 2 are not filled, the sample will not be discharged into the weighing mechanism 3. When the feeding mechanism and the discharging mechanism 2 are filled, the weighing mechanism 3 starts to measure a weight change. Therefore, after the weighing mechanism 3 measures a weight change, it is confirmed that the feeding mechanism 1 and the discharging mechanism 2 are filled. Of course, during this process, the conveying can be started at intervals, and a small part is supplied each time the conveying is started. If the weighing mechanism 3 does not measure a weight change, it means that the feeding mechanism 1 and the discharging mechanism 2 are not filled yet, and continue to start supplying a small part until the weighing mechanism 3 starts to measure a weight change. It can be understood that in this step, the amount supplied each time is relatively small and does not exceed the required weight P. It can be understood that after the feeding mechanism 1 supplies the material, the supply parameters are recorded for convenient calculation before each subsequent supply.

[0063] S3. The feeding mechanism 1 starts to output samples to the weighing mechanism 3, and the total weight of the samples and the actual weight discharged each time are measured. In step S2, since the internal spaces of the feeding mechanism 1 and the discharging mechanism 2 are filled in the previous stage during transportation, the corresponding relationship between the feeding weight during the supply in step S2 and the supply parameters of the feeding mechanism 1 is inaccurate. Therefore, it is necessary to recalibrate this corresponding relationship. Therefore, in step S3, the samples are supplied and discharged to the weighing mechanism 3 again, and the actual weight discharged at this time is calculated. Then, combined with the parameters of the feeding mechanism 1 this time, the accurate corresponding relationship this time can be determined. Among them, the actual weight discharged each time is the difference between the total weight of the samples measured this time and the total weight of the samples measured last time. It can be understood that the total weight of the samples and the actual weight discharged each time are recorded, and the feeding parameters of the feeding mechanism 1 each time are also recorded.

[0064] S4. Referring to Figure 1 and Figure 2 , the feeding mechanism 1 discharges the samples to the weighing mechanism 3 in batches. Before each discharge of the samples, the total weight of the samples obtained by the weighing mechanism 3 last time and the weight of the samples actually discharged last time are weighed and recorded, and a coefficient between the weight of the samples actually discharged last time and the supply parameters of the feeding mechanism 1 is established. The weight of the samples discharged next time is controlled by this coefficient until the difference between the required weight and the total weight of the samples is within the allowable error range.

[0065] In step S4, each time during feeding, the coefficient formed between the actual weight of the samples discharged after the previous feeding and the supply parameters of the feeding mechanism 1 is used to control the discharged weight, that is, this coefficient is updated each time of discharge. Thus, after each discharge, the next discharge can be controlled more precisely. After each discharge, the required weight is compared with the total weight of the samples to determine whether the difference is within the allowable error range. It can be understood that in this step, the target weight during each discharge should be controlled to be less than the difference between the required weight and the total weight of the samples. For example, if the required weight is 10 g and the current total weight of the samples is 6 g, then the target weight of the samples to be discharged next time should be less than 4 g, such as half of the difference, that is, 2 g. That is, the feeding mechanism 1 controls and installs this coefficient to control the discharge of 2 g. Of course, there will be errors in the actual discharge, but adding the error value, the final weight should also be less than 4 g. For example, the actually discharged weight is 1.9 g, so as to avoid the weight directly exceeding 4 g after the discharge of this time, resulting in an excessive discharge of the samples. And the next time of discharge, since the total weight of the samples at this time is 7.9 g and the difference is 2.1 g, the target weight of the next discharge control is 1.05 g... In this way, the samples are continuously discharged, getting closer and closer to the required weight. Finally, when the difference between the required weight and the total weight of the samples is within the allowable error range, the sampling can be ended.

[0066] Preferably, referring to Figure 2 , the steps of S4 are specifically as follows:

[0067] S41. Calculate the coefficient between the weight of the actually discharged sample last time and the supply parameter of the feeding mechanism 1. Among them, the supply parameter is the number of rotation turns of the screw conveyor mechanism or the pushing distance of the push rod conveyor mechanism. That is, the screw conveyor mechanism controls the weight of the discharged sample by controlling the number of rotation turns, and the push rod conveyor mechanism controls the weight of the discharged sample by controlling the pushing distance. Therefore, the coefficient can be determined according to the actually discharged sample weight and this supply parameter, and further, according to this coefficient, the parameter can be determined according to the required discharged weight, that is, how many turns the screw conveyor mechanism needs to rotate or how long the push rod conveyor mechanism needs to push.

[0068] Specifically, in S41, the coefficient is:

[0069] In the formula, n is the number of times of discharging the sample in step S3, and n is greater than or equal to 2; m n is the actual weight of the sample discharged at the nth time; S n is the supply parameter of the feeding mechanism 1 when the sample is discharged at the nth time, and k n is the coefficient at the nth time.

[0070] For example, the weight of the sample discharged for the second time is M 2 , the supply parameter for the second time is S 2 , then the coefficient k 2 for the second time is the ratio of M 2 to S 2 .

[0071] S42. Obtain the single - time supply target weight value, calculate the supply parameter required for the next supply of the feeding mechanism 1 with the coefficient, and control the feeding mechanism 1 to supply materials with the supply parameter. For example, after the second supply is completed, the total weight of the measured sample is M 2 , and the weight that still needs to be supplied is P - M 2 . In order to avoid the total weight after discharge being greater than P due to errors during supply, the single - time supply target weight value for the third supply can be controlled to be set less than P - M 2 , for example, half of the value of P - M 2 . Calculate the number of rotation turns of the screw conveyor mechanism or the pushing distance (i.e., the supply parameter) required to discharge this single - time supply target weight value with this single - time supply target weight value and the coefficient k 2 for the second time, and then control the supply mechanism to work according to the calculated supply parameter, so as to discharge the sample to the weighing mechanism 3.

[0072] Among them, in the step S42, the calculation of the supply parameters required for the next feeding is as follows:

[0073] In the formula, Δm is the target weight value for a single supply; k n is the coefficient of the feeding mechanism 1 when discharging the sample for the nth time, and S n+1 is the supply parameter for the (n + 1)th time.

[0074] For example, after the second supply, k is obtained through calculation 2 , and the required weight Δm for the third discharge is obtained according to a predetermined method. Then the supply parameter S for the third time 3 is The subsequent other supplies are also calculated in this way. Of course, the target weight value Δm for each single supply is newly obtained and not necessarily equal, and k n is also obtained through specific calculation.

[0075] In a preferred embodiment, in the step S42, the obtaining of the target weight value for a single supply is specifically:

[0076] In the formula, P is the required weight, M n is the total weight of the sample measured by the weighing mechanism 3 after the nth feeding, and Δm is the target weight value for a single supply.

[0077] That is, the target weight value for a single supply is half of the difference between the required weight P and the total weight M of the sample n , so that each time the supply is made with half of the difference, continuously controlling the total weight M of the sample n to approach the required weight P, and finally making the difference between the required weight P and the total weight M of the sample 总 within the allowable error range.

[0078] S43. After the current feeding is completed, calculate whether the difference between the required weight and the total weight of the sample is within the allowable error range. If so, the sample sub - sampling is completed; if not, repeat the steps S41 to S43. That is, after each feeding, check whether the difference between the required weight and the total weight of the sample is within the allowable error range. If it is not within the range, the sample needs to be continuously supplied and the supply is controlled according to the previous calculation until the difference is within the allowable error range, and then the sub - sampling ends.

[0079] For example, after the 6th time, the total weight of the sample measured by the weighing mechanism 3 is 9.98 g, the required weight P is 10 g, and the allowable error range is from - 9.95 g to 10.05 g. Then the total weight of the sample at this time meets the requirements and the sub - sampling is completed.

[0080] If after the 6th time, the total weight of the sample measured by the weighing mechanism 3 is 9.94 g, the required weight P is 10 g, and the allowable error range is from -9.95 g to 10.05 g, then the total weight of the sample at this time does not meet the requirements and the sample needs to be continuously discharged. The difference at this time is 0.06 g, so the single-supply target weight value Δm is 0.03 g. Combining with the coefficient k after the 6th supply 6 Calculate to obtain S 7 , and then control the feeding mechanism 1 to discharge the sample. The sample discharged this time is 0.029 g, so the total weight of the sample is 9.969 g. At this time, the total weight of the sample meets the requirements and the sample splitting is completed.

[0081] Refer to Figures 3 to 6 , the present invention also provides a sample splitter, which includes a feeding mechanism 1, a discharging mechanism 2, a weighing mechanism 3 and a controller.

[0082] Among them, the feeding mechanism 1 is a screw conveying mechanism or a push rod conveying mechanism.

[0083] In one embodiment, refer to Figure 3 、 Figure 4 and Figure 6, the screw conveyor mechanism includes a feed pipe 11, a screw conveyor rod 12, and a first rotary driver 13 for driving the screw conveyor rod 12 to rotate. The screw conveyor rod 12 is located inside the feed pipe 11, and the first rotary driver 13 is located outside the feed pipe 11. The feed pipe 11 has an outlet. One end of the feed pipe 11 is a feed inlet, and the feed inlet is inserted into a sample container 4 containing a sample (viscous sample or powder sample). When the first rotary driver 13 is started, it drives the screw conveyor rod 12 to rotate, thereby driving the sample to enter the feed inlet and discharge from the outlet. The first rotary driver 13 can be a motor, such as a servo motor or a stepper motor. In a preferred embodiment, the first rotary driver 13 is a stepper motor. Preferably, the screw conveyor rod 12 is a flexible screw conveyor rod 12. The feed pipe 11 can be a flexible pipe or a rigid pipe. If the feed pipe 11 is bent, the flexible screw conveyor rod 12 can also be adapted for use, facilitating the adjustment of the step position of the screw conveyor rod 12. The step positions of the feed pipe 11 and the feeder can be changed according to different usage scenarios, improving its applicability. Among them, since the first rotary driver 13 is a stepper motor, the number of rotations of the stepper motor can be controlled to accurately control the quantity of the supplied viscous sample, thereby improving the accuracy during sample division. One end of the screw conveyor rod 12 is connected to the first rotary driver 13, and the other end passes through the feed pipe 11 and is inserted into a bucket containing a viscous sample. The side wall of the feed pipe 11 near the first rotary driver 13 intersects and communicates with the discharge pipe 21. The outer circle of the screw conveyor rod 12 is tangent to the discharge pipe 21. When the first rotary driver 13 is started, the screw conveyor rod 12 conveys the viscous sample to the other end. The end of this end is closed, and the viscous sample can only be discharged from the opening connected to the discharge pipe 21 on the side and enter the discharge pipe 21.

[0084] In another embodiment, referring to Figure 5 , the push rod conveyor mechanism includes a feed pipe 11, a feed piston 14 slidably arranged inside the feed pipe 11, and a push-pull driver for driving the feed piston 14 to slide inside the feed pipe 11. The feed pipe 11 has an outlet. One end of the feed pipe 11 is a feed inlet. During use, first inject a viscous sample (not necessarily filled) into the feed pipe 11, and then slowly push out the feed piston 14 with the push-pull driver, so that the viscous sample can be slowly pushed into the discharge pipe 21 and then discharged by the pushing mechanism. Using the piston method, similar to the method of the screw conveyor rod 12, it can achieve continuous conveying and even stop conveying, facilitating the control of the conveying volume. Thus, it can be conveyed in multiple small amounts, making the conveying volume of the discharged viscous sample gradually approach and reach the target weight, improving the weighing accuracy. Among them, the push-pull driver is a stepper telescopic motor, and the extension amount can be accurately controlled by controlling the number of rotations of the stepper telescopic motor, thereby controlling the quantity of the supplied viscous sample to improve the accuracy during sample division.

[0085] Referring to Figure 3, Figure 5 and Figure 6 , the discharging mechanism 2 includes a discharging pipe 21 connected to the outlet of the feeding mechanism 1 and a discharging piston 22 that can slide up and down and rotate or vibrate simultaneously within the discharging pipe 21. The discharging pipe 21 has a discharging port 211. Since the sample is a viscous sample or a powder sample and has adhesiveness, there will be residues on the discharging pipe 21 and the discharging piston 22. Therefore, the discharging piston 22 needs to be set to slide up and down and rotate or vibrate simultaneously. The sample entering the discharging pipe 21 is pushed out through the up and down movement, and when discharging, the viscous sample is thrown out at high speed by rotation, or the powder sample is shaken off by rapid vibration. It can be understood that when it is a viscous sample, the discharging piston 22 of the discharging mechanism 2 is selected to be rotatable, and when it is a powder sample, the discharging piston 22 of the discharging mechanism 2 is selected to be vibratable. Among them, the discharging piston 22 can descend to be flush with the discharging port 211 or below the discharging port 211 to completely discharge the sample. The inner wall of the discharging pipe 21 and the end face of the discharging piston 22 are provided with smooth anti-adhesive layers to further prevent sticky substances from adhering to the inner wall of the discharging pipe 21 and the discharging piston 22 and avoid residues.

[0086] When the sample is a viscous sample, referring to Figure 3 and Figure 5 , the discharging mechanism 2 further includes a pusher 24 and a second rotary driver 26 connected to the output end of the pusher 24. The discharging piston 22 is fixedly connected to the output shaft of the second rotary driver 26, and the pusher 24 is fixed above the discharging pipe 21. The pusher 24 pushes or pulls the second rotary driver 26 and the discharging piston 22 together, so as to realize the downward discharge of the viscous sample, and the second rotary driver 26 plays a role in rotating the discharging piston 22 to throw out the viscous sample. It can be understood that the rotating speed of the discharging piston 22 is relatively fast enough to throw out the viscous sample. Among them, the pusher 24 is a telescopic motor, and the second rotary driver 26 is a rotary motor. In addition, in order to reduce the influence caused by the shaking of the pusher 24 when the discharging piston 22 rotates, a guide rail parallel to the telescopic direction of the pusher 24 can be set, and the second rotary driver 26 is arranged on the guide rail to limit its movement so that it moves along the guide rail by itself without shaking with its own rotation.

[0087] When the sample is a powder sample, referring to Figure 6, the discharging mechanism 2 further includes a pusher 24 and a vibration device 25 connected to the output end of the pusher 24. The discharging piston 22 is fixedly connected to the output end of the vibration device 25, and the pusher 24 is fixed above the discharging pipe 21. The pusher 24 pushes or pulls the vibration device 25 and the discharging piston 22 together, so as to realize the downward discharge of the powder sample, while the vibration device 25 functions to vibrate the discharging piston 22 and vibrate the powder sample down. It can be understood that the vibration frequency of the discharging piston 22 is relatively high and is sufficient to vibrate the powder sample down. Wherein, the pusher 24 is a telescopic motor, and the vibration device 25 is a vibration motor. In addition, in order to reduce the influence caused by the shaking of the pusher 24 when the discharging piston 22 vibrates, a guide rail parallel to the telescopic direction of the pusher 24 can be provided, and the vibration device 25 is arranged on the guide rail to limit its movement so that it moves along the guide rail by itself without shaking with its own rotation.

[0088] Referring to Figures 3 to 6 , the weighing mechanism 3 is located below the discharging pipe 21 to receive the discharged sample and detect the weight of the discharged sample. The weighing mechanism 3 has a relatively high precision and meets the precision requirements for sample weighing. It can be understood that the weighing mechanism 3 is an electronic weighing mechanism 3, which is convenient for the controller to obtain the weighing result data. A receiving container 31 can be placed on the weighing mechanism 3 to receive the discharged sample. Of course, the weighing mechanism 3 performs a tare operation on the receiving container 31 and does not include the weight of the receiving container 31 in the weight of the sample.

[0089] Among them, the controller includes:

[0090] An input module for inputting the required weight P of the sample and the allowable error range. The input module can be a keyboard or a touch operation panel, which allows the user to input the required weight and the allowable error range. Here, the allowable error range can only input the error value. For example, just like 0.05g, only 0.05g can be input, and the controller automatically determines the allowable error range. It can be understood that the input module is configured with a display device to display the input data for the user to observe.

[0091] A weight acquisition module for acquiring the total weight of the sample measured by the weighing mechanism 3 and calculating the actual weight of the discharged sample based on the total weight of the sample. The controller is electrically connected to the weighing device. After each measurement of the total weight of the sample by the weighing mechanism 3, the weight acquisition module obtains this data, records it, calculates it with the total weight of the previous sample, and subtracts the total weight M of the previous sample from the total weight M of this sample, so as to obtain the actual weight m of the discharged sample for the nth time. n Subtract the total weight M of the previous sample from the total weight M of this sample n-1 , so as to obtain the actual weight m of the discharged sample for the nth time n .

[0092] A parameter acquisition module is used to acquire the feeding parameters of the feeding mechanism 1. The controller is electrically connected to the feeding mechanism and detects the feeding parameter S during each feeding of the feeding mechanism 1 n . Among them, the feeding parameter S n is the number of rotation cycles of the screw conveyor mechanism or the pushing distance of the push rod conveyor mechanism

[0093] A coefficient calculation module is used to calculate the actual weight m of the sample discharged last time and the coefficient k between the feeding parameter and the feeding parameter S of the feeding mechanism 1 according to the feeding parameter and the sample weight n and the feeding parameter S of the feeding mechanism 1 n between them n . Specifically, the coefficient is

[0094] In the formula, n is the number of times of discharging the sample in step S3, and n is greater than or equal to 2; m n is the actual weight of the sample discharged for the nth time; S n is the feeding parameter of the feeding mechanism 1 when the sample is discharged for the nth time, and k n is the coefficient for the nth time

[0095] An output control module is used to control the weight of the sample discharged next time according to the coefficient. By calculating the obtained feeding parameter, the weight of the discharged sample is controlled, so that the weight of the discharged sample is more accurate

[0096] A judgment module is used to judge whether the difference between the required weight and the total weight of the sample is within the allowable error range. When the difference between the required weight and the total weight of the sample is within the allowable error range, the sample splitting can be ended. If not, the sample needs to be continuously supplied until the difference between the required weight and the total weight of the sample is within the allowable error range

[0097] Specifically, the output control module includes

[0098] A target calculation module is used to obtain the single - time supply target weight value Δm. Specifically In the formula, P is the required weight, M n is the total weight of the sample measured by the weighing mechanism 3 after the nth feeding, and Δm is the single - time supply target weight value. That is, the single - time supply target weight value is half of the difference between the required weight P and the total weight M of the sample, so that each time the supply is made with half of the difference, continuously controlling the total weight M of the sample n to approach the required weight P, and finally making the difference between the required weight P and the total weight M of the sample n within the allowable error range 总

[0099] ​A parameter calculation module is used to calculate the supply parameters for the next discharge according to the single - supply target weight value and the coefficient. If the weight in the (n + 1)-th discharge is set as Δm, then the supply parameter S n+1 is:

[0100] In the formula, Δm is the single - supply target weight value; k n is the coefficient of the feeding mechanism 1 when discharging the sample for the n - th time, and S n+1 is the supply parameter for the (n + 1)-th time.

[0101] An output module controls the conveying mechanism to supply the sample according to the supply parameters. When discharging in the (n + 1)-th supply, according to the calculated S n+1 , control the feeding mechanism to work and discharge the sample.

[0102] For other contents of the sample - splitting method of the present invention, refer to the prior art and will not be elaborated here.

[0103] The above - mentioned are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A sample splitting method for a sample splitter, the sample splitter comprising a feeding mechanism, a discharging mechanism and a weighing mechanism, the feeding mechanism being a screw conveying mechanism or a push rod conveying mechanism, the discharging mechanism including a discharge pipe connected to the outlet of the feeding mechanism and a discharging piston that can slide up and down and rotate or vibrate simultaneously within the discharge pipe, Characterized in that, the method comprises the following steps: S1. Obtain the required weight of the sample and the allowable error range; S2. The feeding mechanism is activated to output the sample to the weighing mechanism until the weighing mechanism detects a change in weight; S3. The feeding mechanism is activated to output the sample to the weighing mechanism, and the total weight of the sample and the actual weight discharged each time are measured; S4. The feeding mechanism discharges the sample to the weighing mechanism in batches. Before each discharge of the sample, weigh and record the total weight of the sample obtained by the weighing mechanism last time and the weight of the sample actually discharged last time, establish a coefficient between the weight of the sample actually discharged last time and the supply parameters of the feeding mechanism, and control the weight of the sample discharged next time with the coefficient until the difference between the required weight and the total weight of the sample is within the allowable error range; The steps of S4 are specifically: S41. Calculate the coefficient between the weight of the sample actually discharged last time and the supply parameters of the feeding mechanism; S42. Obtain the target weight value for a single supply, calculate the supply parameters required for the next feeding of the feeding mechanism with the coefficient, and control the feeding mechanism to feed with the supply parameters; S43. After the feeding of the current time is completed, calculate whether the difference between the required weight and the total weight of the sample is within the allowable error range. If so, the sample splitting is completed; if not, repeat S41 to S43; In S41, the coefficient is: In the formula, n is the number of times of discharging the sample in step S3, and n is greater than or equal to 2; m n is the actual weight of the sample discharged for the nth time; S n is the supply parameter of the feeding mechanism when discharging the sample for the nth time, k n is the coefficient for the nth time.

2. The sample splitting method according to claim 1, Characterized in that, in the step of S42, the obtaining of the target weight value for a single supply is specifically: Wherein, P is the required weight, and M n is the total weight of the sample measured by the weighing mechanism after the nth feeding, and Δm is the target weight value for a single supply.

3. The sample splitting method according to claim 2, Characterized in that, in the step of S42, the calculation of the supply parameters required for the next feeding is: In the formula, S n+1 is the supply parameter for the (n + 1)-th time.

4. The sample splitting method according to any one of claims 1 to 3, Characterized in that, the supply parameters are the number of rotation turns of the screw conveying mechanism or the pushing distance of the push rod conveying mechanism.

5. The sample splitting method according to claim 1, Characterized in that, after the feeding mechanism feeds, record the supply parameters.

6. A sample splitter, Characterized in that, comprises: a feeding mechanism, the feeding mechanism being a screw conveying mechanism or a push rod conveying mechanism; a discharging mechanism, including a discharge pipe connected to the outlet of the feeding mechanism and a discharging piston that can slide up and down and rotate or vibrate simultaneously within the discharge pipe; a weighing mechanism, located below the discharge pipe; and a controller, comprising: an input module, for inputting the required weight of the sample and the allowable error range; a weight acquisition module, for acquiring the total weight of the sample measured by the weighing mechanism and calculating the weight of the sample actually discharged according to the total weight of the sample; a parameter acquisition module, for acquiring the supply parameters of the feeding mechanism; A coefficient calculation module, configured to calculate a coefficient between the actually discharged sample weight in the previous time and the supply parameter of the feeding mechanism according to the feeding parameter and the sample weight; An output control module, configured to control the sample weight discharged next time according to the coefficient; A judgment module, configured to judge whether the difference between the required weight and the total sample weight is within the error tolerance range; The output control module includes: A target calculation module, configured to obtain a single-supply target weight value; A parameter calculation module, configured to calculate the supply parameter for the next discharge according to the single-supply target weight value and the coefficient; An output module, configured to control the feeding mechanism to supply samples according to the supply parameter; The single-supply target weight value is: In the formula, P is the required weight, and M n is the total weight of the sample measured by the weighing mechanism after the nth feeding, and Δm is the target weight value for a single supply.

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