Powder sampling method and system based on a powder sampling device

Abstract

The present application relates to a kind of powder sampling method and system based on powder sampling device, belong to petrochemical technical field, method includes real-time acquisition current period weighing device to the measured value of powder taken, and the control parameter of powder sampling motor;According to the target powder sampling amount given in advance and the measured value of powder taken, determine the remaining powder to be taken amount and based on the remaining powder to be taken amount, determine the powder stage to which the next cycle powder belongs;Based on the parameter adjustment rule corresponding to the powder stage to which the next cycle powder belongs, the control parameter of powder sampling motor is parameter adjusted, and the target control parameter corresponding to the next cycle powder of powder sampling motor is obtained;The target control parameter is sent to powder sampling motor, to carry out the next cycle of powder sampling, until powder sampling is completed, by stage powder taking, can be realized in the way of target powder amount approximation, to the last stage of trace powder, reduce the error of result close to target value, improve sampling accuracy.

Description

Technical Field

[0001] This invention relates to the field of petrochemical technology, and in particular to a powder sampling method and system based on a powder sampling device. Background Technology

[0002] In various industries (such as pharmaceuticals and chemicals), a certain amount of solid powder is needed as a solute when preparing reagents. Typically, the precision required for extracting the powder is quite high, and some powders are toxic or harmful to the human body.

[0003] In existing technologies, manual weighing of powder is often used. For example, the weight-reduction weighing method requires first weighing the total mass of the powder bottle containing powder and recording the current weight data; removing the powder bottle from the balance, tilting the bottle above the receiving container, and gently tapping the top of the bottle opening with the cap to allow the powder to gently fall into the receiving container, ensuring the cap remains above the receiving container throughout; when the poured sample is close to the required amount, while continuing to gently tap the bottle opening with the cap, gradually straighten the bottle to allow any powder adhering to the opening to fall back into the bottle, then close the cap; and finally accurately weigh the powder bottle. The weight of the sample taken is obtained by subtracting the previously measured and recorded total mass of the powder bottle from the original weight.

[0004] However, the current method of powder collection is often limited by the staff's skill level. Since the collected powder cannot be poured back into the weighing bottle, if the staff collects too much powder, it may lead to powder waste. Summary of the Invention

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a powder sampling method and system based on a powder sampling device, which solves the technical problem that the powder sampling accuracy is limited by the skill level of the operator in the prior art, which may lead to powder waste.

[0006] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0007] The first aspect of the present invention provides a powder sampling method based on a powder sampling device.

[0008] The powder sampling method based on a powder sampling device proposed in this embodiment of the invention includes:

[0009] A control device is electrically connected to a weighing device, which is positioned directly opposite the outlet of the powder sampling device. A powder sampling motor, which controls the amount of powder dispensed from the powder sampling device, is installed in the outlet area of ​​the powder sampling device. The powder sampling motor is electrically connected to the control device. The method includes:

[0010] The control device acquires in real time the measurement value of the powder collected by the weighing device in the current cycle, as well as the control parameters of the powder sampling motor.

[0011] The control device determines the remaining amount of powder to be collected based on the pre-given target powder sampling amount and the measured value of the powder already collected, and determines the powder collection stage to which the next powder collection cycle belongs based on the remaining amount of powder to be collected.

[0012] The control device adjusts the control parameters of the powder sampling motor based on the parameter adjustment rules corresponding to the powder sampling stage of the next powder sampling cycle, so as to obtain the target control parameters of the powder sampling motor for the next powder sampling cycle; wherein, the parameter adjustment rules are different for different powder sampling stages.

[0013] The control device sends the target control parameters to the powder sampling motor to perform powder sampling in the next cycle until the powder sampling is completed.

[0014] In some instances, the powder extraction stage includes at least a first powder extraction stage based on a first parameter adjustment rule and a second powder extraction stage based on a second parameter adjustment rule;

[0015] The step of determining the powder extraction stage for the next extraction cycle based on the remaining amount of powder to be extracted includes:

[0016] If the remaining amount of powder to be taken is greater than a predetermined value, then the powder taking stage to which the next cycle of powder taking belongs is determined to be the first powder taking stage; wherein, the first parameter adjustment rule is to determine the control parameters of the powder sampling motor based on the periodic decreasing method of powder taking speed.

[0017] If the remaining amount of powder to be taken is less than or equal to the predetermined value, then the powder taking stage to which the next cycle of powder taking belongs is determined as the second powder taking stage; wherein, the second parameter adjustment rule is to determine the control parameters of the powder sampling motor by using the powder taking speed as a fixed proportion of the maximum powder taking speed.

[0018] In some instances, determining the control parameters of the powder sampling motor based on the periodic decrease in powder sampling speed includes:

[0019] Determine the parameter adjustment model corresponding to the periodic decrease in powder extraction speed;

[0020] Based on the parameter adjustment model, the control parameters of the powder sampling motor are determined; wherein, the parameter adjustment model includes:

[0021] Target control parameter = remaining amount of powder to be taken * control parameter of the previous cycle ÷ powder taking speed in the previous cycle * N; where N is a percentage less than 100%.

[0022] In some instances, the fixed percentage is less than or equal to 5%.

[0023] In some instances, the powder sampling device includes a spiral that carries powder moving from bottom to top; the spiral moves from bottom to top under the drive of the powder sampling motor so that the powder moves to a predetermined position and then enters a powder drop tube; wherein the outlet of the powder drop tube is the outlet of the powder sampling device.

[0024] Before determining the control parameters of the powder sampling motor based on the parameter adjustment model, the method includes:

[0025] Based on the powder carrying space of the spiral, a correspondence between the control parameters of the powder sampling motor and the powder sampling speed is established;

[0026] Based on the correspondence between the control parameters of the powder sampling motor and the powder sampling speed, the parameter adjustment model is established.

[0027] In some instances, the control parameters include motor speed and / or speed duty cycle.

[0028] In some instances, the weighing device includes a precision balance;

[0029] The powder sampling device includes a powder sampling container and a drive assembly; the powder sampling container includes a container body and a slip ring;

[0030] The tank has openings at both the top and bottom, and the tank has a storage space inside;

[0031] The slip ring is disposed at the lower opening of the tank body, and the fixed end of the slip ring is connected to the tank body;

[0032] The spiral body has a through hole along its axial direction, the spiral body is coaxially arranged with the tank body, the spiral body is connected to the rotating end of the slip ring, and the bottom end of the spiral body extends out of the tank body;

[0033] The drive assembly drives the spiral to rotate so that the powder in the lower part of the tank spirals upward and enters the top of the spiral's through hole, and then exits from the outlet of the spiral's through hole.

[0034] In some instances, the helix includes a screw, helical blades, and a fixed cap;

[0035] The spiral blades are disposed on the upper part of the screw, the fixing cover is disposed on the top of the screw, and the outer edge of the spiral blades is in contact with the inner wall of the fixing cover;

[0036] The fixed cover is fixed inside the tank by a connecting rod.

[0037] In some instances, the drive assembly includes a first roller, a second roller, and a hinge;

[0038] The output end of the motor is connected to the first roller, the second roller is sleeved on the screw located on the outside, and the hinge is sleeved on the first roller and the second roller.

[0039] In some instances, the powder sampling device also includes a stirring rod;

[0040] The stirring rod includes a vertical part and a horizontal part connected together, and one end of the horizontal part is connected to the screw.

[0041] The drive assembly drives the screw to rotate the vertical part to stir the powder at the bottom of the tank.

[0042] A second aspect of the present invention provides a powder sampling system.

[0043] The powder sampling system proposed in this embodiment of the invention is used to perform the powder sampling method of the first aspect described above, and includes: the control device, the powder sampling device, and the weighing device; wherein, the weighing device includes a precision balance;

[0044] The powder sampling device includes a powder sampling container and a drive assembly; the powder sampling container includes a container body and a slip ring;

[0045] The tank has openings at both the top and bottom, and the tank has a storage space inside;

[0046] The slip ring is disposed at the lower opening of the tank body, and the fixed end of the slip ring is connected to the tank body;

[0047] The spiral body has a through hole along its axial direction, the spiral body is coaxially arranged with the tank body, the spiral body is connected to the rotating end of the slip ring, and the bottom end of the spiral body extends out of the tank body;

[0048] The drive assembly drives the spiral to rotate so that the powder in the lower part of the tank spirals upward and enters the top of the spiral's through hole, and then exits from the outlet of the spiral's through hole.

[0049] The helical body includes a screw, helical blades, and a fixed cap;

[0050] The spiral blades are disposed on the upper part of the screw, the fixing cover is disposed on the top of the screw, and the outer edge of the spiral blades is in contact with the inner wall of the fixing cover;

[0051] The fixed cover is fixed inside the tank by a connecting rod.

[0052] In some instances, the drive assembly includes a first roller, a second roller, and a hinge;

[0053] The output end of the powder sampling motor is connected to the first roller, the second roller is sleeved on the screw located on the outside, and the hinge is sleeved on the first roller and the second roller.

[0054] In some instances, the powder sampling device also includes a stirring rod;

[0055] The stirring rod includes a vertical part and a horizontal part connected together, and one end of the horizontal part is connected to the screw.

[0056] The drive assembly drives the screw to rotate the vertical part to stir the powder at the bottom of the tank.

[0057] This invention discloses a powder sampling method based on a powder sampling device, comprising: a control device electrically connected to a weighing device, the weighing device being directly opposite the outlet of the powder sampling device; a powder sampling motor for controlling the amount of powder dispensed from the powder sampling device being installed in the outlet area of ​​the powder sampling device; and the powder sampling motor being electrically connected to the control device. The method includes: the control device acquiring in real-time the measured value of the powder already sampled by the weighing device in the current cycle, and the control parameters of the powder sampling motor; the control device determining the remaining amount of powder to be sampled based on a pre-given target powder sampling amount and the measured value of the powder already sampled, and determining the powder sampling stage to which the next cycle of powder sampling belongs based on the remaining amount of powder to be sampled; the control device adjusting the control parameters of the powder sampling motor according to the parameter adjustment rules corresponding to the powder sampling stage to which the next cycle of powder sampling belongs, to obtain the target control parameters corresponding to the powder sampling motor in the next cycle of powder sampling; wherein the parameter adjustment rules are different for different powder sampling stages; and the control device sending the target control parameters to the powder sampling motor for powder sampling in the next cycle, until powder sampling is completed. In this application, the remaining amount of powder to be collected is monitored in real time. Based on the remaining amount of powder to be collected, the powder collection stage of the next cycle is determined. This allows for real-time monitoring of the rapid sampling stage when the amount of powder to be collected is large and the fine-tuning sampling stage when the amount is small. Then, based on the parameter adjustment rules corresponding to the powder collection stage of the next cycle, the control parameters of the powder sampling motor are adjusted to obtain the target control parameters of the powder sampling motor for the next cycle. This enables rapid sampling in the rapid sampling stage and fine-tuning sampling in the fine-tuning sampling stage. In this way, by approximating the target amount of powder collected and by collecting small amounts of powder in the final stage, the error in getting the result close to the target value is reduced, thereby improving the sampling accuracy of the target powder amount. Attached Figure Description

[0058] Figure 1 A flowchart of a powder sampling method based on a powder sampling device is provided for the prior art.

[0059] Figure 2This is a schematic diagram of a powder sampling device provided in an embodiment of the present invention;

[0060] Figure 3 A flowchart of a powder sampling process based on a powder sampling device provided for embodiments of the present invention;

[0061] Figure 4 This is a schematic diagram of the powder sampling container structure provided in an embodiment of the present invention. Detailed Implementation

[0062] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0063] The powder sampling method based on a powder sampling device proposed in this invention addresses the problems of low accuracy and easy over-powdering in manual powder sampling. Through staged powder sampling, it achieves a method that approximates the target powder sampling amount, culminating in a final stage of micro-powder sampling. Throughout the process, the control parameters of the powder sampling motor are adjusted based on the parameter adjustment rules corresponding to the powder sampling stage of the next sampling cycle. This yields the target control parameters for the powder sampling motor in the next sampling cycle, enabling rapid sampling in the rapid sampling stage and fine-tuning sampling in the fine-tuning sampling stage. This approach, approximating the target powder sampling amount and using the final stage of micro-powder sampling, reduces the error in getting the result close to the target value, thereby improving the sampling accuracy of the target powder sampling amount.

[0064] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0065] Figure 1 A flowchart illustrating a powder sampling method based on a powder sampling device, provided for existing technologies. Figure 1 As shown in the embodiment of the present invention, a powder sampling method based on a powder sampling device includes a control device electrically connected to a weighing device, the weighing device being directly opposite the outlet of the powder sampling device, and a powder sampling motor for controlling the amount of powder dispensed from the powder sampling device being installed in the outlet area of ​​the powder sampling device, the powder sampling motor being electrically connected to the control device; the method includes:

[0066] Step 100: The control device acquires in real time the measurement value of the powder collected by the weighing device in the current cycle, as well as the control parameters of the powder sampling motor.

[0067] Step 110: The control device determines the remaining amount of powder to be taken based on the pre-given target powder sampling amount and the measured value of the powder already taken, and determines the powder taking stage to which the next powder taking cycle belongs based on the remaining amount of powder to be taken.

[0068] Step 120: The control device adjusts the control parameters of the powder sampling motor based on the parameter adjustment rules corresponding to the powder sampling stage of the next powder sampling cycle, so as to obtain the target control parameters of the powder sampling motor for the next powder sampling cycle; wherein, the parameter adjustment rules are different for different powder sampling stages.

[0069] Step 130: The control device sends the target control parameters to the powder sampling motor to perform the next cycle of powder sampling until the powder sampling is completed.

[0070] In this exemplary embodiment, Figure 2 This is a schematic diagram of a powder sampling device provided in an embodiment of the present invention. Figure 2 As shown, the powder sampling device includes: a powder sampling motor 01, a powder sampling container 02, a weighing cup 03, and a precision balance 04. The weighing cup 03 and the precision balance 04 constitute a weighing device. The control device can monitor the weight of the powder falling into the weighing device and the control parameters of the powder sampling motor in real time. The control parameters may include the motor speed and / or the speed duty cycle.

[0071] In this exemplary embodiment, the powder sampling device has a sampling spiral, and the sampling space of the spiral is fixed. Therefore, there is a linear correspondence between the control parameters of the powder sampling motor driving the spiral to rotate and the powder sampling speed. Thus, the powder sampling speed can be adjusted by controlling the control parameters of the powder sampling motor.

[0072] Based on this, the control device acquires in real time the measured value of the powder already collected by the weighing device in the current cycle, as well as the control parameters of the powder sampling motor. According to the pre-given target powder sampling amount and the measured value of the powder already collected, the control device determines the remaining amount of powder to be collected, and based on the remaining amount of powder to be collected, determines the powder collection stage to which the next cycle of powder collection belongs. Based on the parameter adjustment rules corresponding to the powder collection stage to which the next cycle of powder collection belongs, the control device adjusts the control parameters of the powder sampling motor to obtain the target control parameters corresponding to the powder sampling motor for the next cycle of powder collection. The parameter adjustment rules are different for different powder collection stages. The control device sends the target control parameters to the powder sampling motor to perform powder sampling for the next cycle until powder sampling is completed. In this application, the remaining amount of powder to be collected is monitored in real time. Based on the remaining amount of powder to be collected, the powder collection stage of the next cycle is determined. This allows for real-time monitoring of the rapid sampling stage when the amount of powder to be collected is large and the fine-tuning sampling stage when the amount is small. Then, based on the parameter adjustment rules corresponding to the powder collection stage of the next cycle, the control parameters of the powder sampling motor are adjusted to obtain the target control parameters of the powder sampling motor for the next cycle. This enables rapid sampling in the rapid sampling stage and fine-tuning sampling in the fine-tuning sampling stage. In this way, by approximating the target amount of powder collected and by collecting small amounts of powder in the final stage, the error in getting the result close to the target value is reduced, thereby improving the sampling accuracy of the target powder amount.

[0073] In some instances, the powder extraction stage includes at least a first powder extraction stage based on a first parameter adjustment rule and a second powder extraction stage based on a second parameter adjustment rule;

[0074] The step of determining the powder extraction stage for the next extraction cycle based on the remaining amount of powder to be extracted includes:

[0075] If the remaining amount of powder to be taken is greater than a predetermined value, then the powder taking stage to which the next cycle of powder taking belongs is determined to be the first powder taking stage; wherein, the first parameter adjustment rule is to determine the control parameters of the powder sampling motor based on the periodic decreasing method of powder taking speed.

[0076] If the remaining amount of powder to be taken is less than or equal to the predetermined value, then the powder taking stage to which the next cycle of powder taking belongs is determined as the second powder taking stage; wherein, the second parameter adjustment rule is to determine the control parameters of the powder sampling motor by using the powder taking speed as a fixed proportion of the maximum powder taking speed.

[0077] In this exemplary embodiment, the powder collection stage can be divided into at least a first powder collection stage and a second powder collection stage. Specifically, the powder collection process first involves the first powder collection stage and then proceeds to the second powder collection stage. In the first powder collection stage, the control parameters of the powder sampling motor are adjusted according to a first parameter adjustment rule to perform rapid powder collection. When the collected powder amount approaches the target value, the process proceeds to the second powder collection stage. In the second powder collection stage, the control parameters of the powder sampling motor are adjusted according to a second parameter adjustment rule to perform fine powder collection, thus improving the final powder collection accuracy.

[0078] In this exemplary embodiment, the periodic decrease in the fan-collecting speed can be understood as defining multiple fan-collecting cycles during a single fan-collecting process, for example, one second as a fan-collecting cycle. In the first second, fans are collected at a speed of A1 to obtain a fan-collected amount M1. In the second second, fans are collected at a speed of A2, which is lower than A1, to obtain a fan-collected amount M2, and so on, decreasing second by second until the second fan-collecting stage begins. This helps control the fan-collecting speed and avoids excessive collection.

[0079] In some instances, determining the control parameters of the powder sampling motor based on the periodic decrease in powder sampling speed includes:

[0080] Determine the parameter adjustment model corresponding to the periodic decrease in powder extraction speed;

[0081] Based on the parameter adjustment model, the control parameters of the powder sampling motor are determined; wherein, the parameter adjustment model includes:

[0082] Target control parameter = remaining amount of powder to be taken * control parameter of the previous cycle ÷ powder taking speed in the previous cycle * N; where N is a percentage less than 100%.

[0083] In this exemplary embodiment, the target control parameters can be controlled by adjusting the parameter adjustment model to achieve a cycle-by-cycle decrease in the powder extraction speed. Here, N can be 90%, 80%, etc., which is merely an example and not intended to be limiting.

[0084] In some instances, the fixed percentage is less than or equal to 5%.

[0085] In this exemplary embodiment, when the powder sampling enters the second powder sampling stage for fine powder sampling, the powder sampling speed can be limited by adjusting the control parameters of the powder sampling motor. For example, by setting a small fixed ratio, the powder sampling device can perform fine and uniform powder sampling, thereby improving the powder sampling accuracy.

[0086] Figure 3 A flowchart illustrating the powder sampling process based on a powder sampling device provided in an embodiment of the present invention. Figure 3 As shown, the powder sampling process includes:

[0087] Step 30, Begin;

[0088] Step 31: Assign the remaining amount of powder to be taken = target amount of powder to be taken;

[0089] Step 32: Determine if the remaining amount of powder to be taken is greater than 100mg;

[0090] Step 33: If the remaining amount of powder to be taken is greater than 100mg, record the current weighing value of the precision balance as the previous weighing value.

[0091] Step 34: Determine if the rotational speed duty cycle is less than 5%;

[0092] Step 35: If the rotational speed duty cycle is not less than 5%, the powder sampling motor will rotate according to the rotational speed duty cycle.

[0093] Step 36: If the rotational speed duty cycle is less than 5%, then preset the rotational speed duty cycle of the powder sampling motor to 5%.

[0094] Step 37: Rotate the sampling powder container to collect powder;

[0095] Step 38: Read the weight using a precision balance after 1 second;

[0096] Step 39: Weigh the powder sample within 1 second = Weighing value of the balance - previous weighing value of the balance;

[0097] Step 40: Remaining amount of powder to be taken = Target powder sample amount - Balance weighing value;

[0098] Step 41: Rotation speed duty cycle = Remaining amount of powder to be collected * Rotation speed duty cycle / Weight of powder sample weighed by balance within 1 second * 90%;

[0099] Step 42: If the remaining amount of powder to be taken is no more than 100mg, then determine whether the powder taking accuracy has been achieved. If the powder taking accuracy has not been achieved, then proceed to step 36.

[0100] Step 43: If the powder dispensing accuracy is achieved, the dispensing process ends and the powder dispensing motor stops rotating. The data in the above embodiments are merely examples and are not limiting. 100mg can be replaced by any data between 90mg and 110mg. 5% can be replaced by any data between 1% and 10%. 90% can be replaced by any data between 80% and 99%. 1 second is the set period; in practical applications, it can be set as needed, for example, data between 0.5 seconds and 2 seconds.

[0101] In some instances, the powder sampling device includes a spiral that carries powder moving from bottom to top; the spiral moves from bottom to top under the drive of the powder sampling motor so that the powder moves to a predetermined position and then enters a powder drop tube; wherein the outlet of the powder drop tube is the outlet of the powder sampling device.

[0102] Before determining the control parameters of the powder sampling motor based on the parameter adjustment model, the method includes:

[0103] Based on the powder carrying space of the spiral, a correspondence between the control parameters of the powder sampling motor and the powder sampling speed is established;

[0104] Based on the correspondence between the control parameters of the powder sampling motor and the powder sampling speed, the parameter adjustment model is established.

[0105] In this exemplary embodiment, the powder sampling device includes a sampling spiral with a fixed sampling space. Therefore, there is a linear relationship between the control parameters of the powder sampling motor driving the spiral to rotate and the powder sampling speed, thereby adjusting the powder sampling speed by controlling the control parameters of the powder sampling motor.

[0106] In some instances, the control parameters include motor speed and / or speed duty cycle.

[0107] The powder sampling system proposed in this invention is used to execute the powder sampling methods of the above embodiments, and includes: the control device, the powder sampling device, and the weighing device; wherein, the weighing device includes a precision balance;

[0108] The powder sampling device includes a powder sampling container and a drive assembly;

[0109] Figure 4 This is a schematic diagram of the powder sampling container structure provided in an embodiment of the present invention. Figure 4 As shown, the powder sampling container includes a container body 1 and a slip ring 4;

[0110] The tank body 1 has openings at both the top and bottom, and the tank body 1 has a receiving space inside;

[0111] The slip ring 4 is disposed at the lower opening of the tank body, and the fixed end of the slip ring is connected to the tank body;

[0112] The spiral body 3 has a through hole along its axial direction. The spiral body 3 is coaxially arranged with the tank body 1. The spiral body 3 is connected to the rotating end of the slip ring 4, and the bottom end of the spiral body 3 extends out of the tank body.

[0113] The drive assembly drives the spiral to rotate so that the powder in the lower part of the tank spirals upward and enters the top of the spiral's through hole, and then exits from the outlet of the spiral's through hole.

[0114] In this exemplary embodiment, a slip ring is connected to a auger, and the slip ring is connected to a powder sampling motor via a hinge. The powder sampling motor drives the slip ring to rotate, thereby driving the auger to rotate.

[0115] In some instances, the helical body 3 includes a screw 10, helical blades 11, and a fixed cap 7;

[0116] The spiral blade 11 is disposed on the upper part of the screw 10, the fixing cover 7 is covered on the top of the screw 10, and the outer edge of the spiral blade 11 is in contact with the inner wall of the fixing cover 7.

[0117] The fixed cover is fixed inside the tank by a connecting rod.

[0118] In this exemplary embodiment, the spiral blades can be used to carry powder, causing the powder to move upwards as the spiral blades rotate. A fixed cap is placed on top of the spiral body, so that the powder moving upwards reaches a predetermined position and, under the action of the fixed cap, enters the through hole of the spiral body, thus falling downwards into the weighing device.

[0119] In some instances, the drive assembly includes a first roller, a second roller 8, and a hinge;

[0120] The output end of the powder sampling motor is connected to the first roller, the second roller is sleeved on the screw located on the outside, and the hinge is sleeved on the first roller and the second roller 8.

[0121] In this exemplary embodiment, the powder sampling motor drives the first roller and the second roller to rotate via a hinge. The first roller is located on the powder sampling motor, and the second roller is located on a slip ring and fixedly connected to the slip ring.

[0122] In some instances, the powder sampling device further includes a stirring rod 5;

[0123] The stirring rod 5 includes a vertical part and a horizontal part connected together, and one end of the horizontal part is connected to the screw 10;

[0124] The drive assembly drives the screw to rotate the vertical part to stir the powder at the bottom of the tank.

[0125] In this exemplary embodiment, the stirring rod can be used to stir the powder, preventing large powder particles from clogging and affecting powder output. The powder sampling container also includes a bottom cover 2, a baffle ring 6, and a powder outlet 9. The baffle ring 6 is used to block the powder. The powder outlet is used to allow powder to fall out.

[0126] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0127] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0128] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0129] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0130] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A powder sampling method based on a powder sampling device, characterized by, The control device is electrically connected to the weighing device, which is opposite to the outlet of the powder sampling device. The outlet area of the powder sampling device is provided with a powder sampling motor for controlling the sampling amount of powder in the powder sampling device. The powder sampling motor is electrically connected to the control device. The method comprises the following steps: The control device acquires the measurement value of the weighing device for the sampled powder in the current period and the control parameter of the powder sampling motor in real time; The control device determines the remaining amount of powder to be sampled according to the target powder sampling amount and the measurement value of the sampled powder, and determines the sampling stage to which the powder sampling in the next period belongs based on the remaining amount of powder to be sampled; The control device adjusts the control parameter of the powder sampling motor based on the parameter adjustment rule corresponding to the sampling stage to which the powder sampling in the next period belongs, to obtain the target control parameter of the powder sampling motor in the next period; wherein the parameter adjustment rules corresponding to different sampling stages are different; The control device sends the target control parameter to the powder sampling motor to perform powder sampling in the next period until the powder sampling is completed; wherein the sampling stage at least includes a first sampling stage based on a first parameter adjustment rule and a second sampling stage based on a second parameter adjustment rule; The determination of the sampling stage to which the powder sampling in the next period belongs based on the remaining amount of powder to be sampled comprises: If the remaining amount of powder to be sampled is greater than a predetermined value, it is determined that the sampling stage to which the powder sampling in the next period belongs is the first sampling stage; wherein the first parameter adjustment rule is to determine the control parameter of the powder sampling motor based on a periodic decreasing mode of sampling speed; If the remaining amount of powder to be sampled is less than or equal to the predetermined value, it is determined that the sampling stage to which the powder sampling in the next period belongs is the second sampling stage; wherein the second parameter adjustment rule is to determine the control parameter of the powder sampling motor based on a fixed proportion mode of sampling speed with the maximum sampling speed; The determination of the control parameter of the powder sampling motor based on the periodic decreasing mode of sampling speed comprises: determining a parameter adjustment model corresponding to the periodic decreasing mode of sampling speed; determining the control parameter of the powder sampling motor based on the parameter adjustment model; wherein the parameter adjustment model comprises: target control parameter = remaining amount of powder to be sampled * control parameter of last period ÷ sampling speed in last period * N; wherein N is a percentage less than 100%; The powder sampling device comprises a spiral body for carrying powder to move upwards; the spiral body moves upwards under the driving of the powder sampling motor, so that the powder moves to a predetermined position and then enters a powder falling pipe; wherein the outlet of the powder falling pipe is the outlet of the powder sampling device; Before determining the control parameter of the powder sampling motor based on the parameter adjustment model, the method comprises the following steps: establishing a corresponding relationship between the control parameter of the powder sampling motor and the powder sampling speed based on the powder carrying space of the spiral body; establishing the parameter adjustment model based on the corresponding relationship between the control parameter of the powder sampling motor and the powder sampling speed.

2. The powder sampling method based on a powder sampling device according to claim 1, characterized in that, The fixed proportion is less than or equal to 5%.

3. The powder sampling method based on a powder sampling device according to any one of claims 1 to 2, characterized in that, The control parameter comprises motor rotating speed and / or rotating speed duty ratio.

4. A powder sampling system characterized by, The system comprises the control device, the powder sampling device and the weighing device; the weighing device comprises a precision balance. The powder sampling device comprises a powder sampling tank and a driving assembly; the powder sampling tank comprises a tank body and a sliding ring. The tank body is open at both upper and lower ends, and has a containing space inside. The sliding ring is arranged at the lower end opening of the tank body, and a fixed end of the sliding ring is connected with the tank body. A helix body is coaxially arranged with the tank body, and has a through hole along an axial direction; a rotating end of the sliding ring is connected with the helix body, and a bottom end of the helix body extends out of the tank body. The driving assembly drives the helix body to rotate, so that the powder in the lower part of the tank body is spirally lifted into the top end of the through hole of the helix body and then output from an outlet of the through hole of the helix body.

5. The system of claim 4, wherein, The helix body comprises a screw rod, helical blades and a fixed cover. The helical blades are arranged on the upper part of the screw rod, and the fixed cover is arranged on the top of the screw rod; the outer edge of the helical blades is attached to the inner wall of the fixed cover. The fixed cover is fixed in the tank body by a connecting rod.

6. The system of claim 5, wherein, The driving assembly comprises a first roller, a second roller and a hinge. The output end of the powder sampling motor is connected with the first roller; the second roller is sleeved on the screw rod outside; and the hinge is sleeved on the first roller and the second roller.

7. The system of claim 5, wherein, The powder sampling device further comprises a stirring rod. The stirring rod comprises a connected vertical part and a horizontal part; one end of the horizontal part is connected with the screw rod. The driving assembly drives the screw rod to rotate the vertical part to stir the powder at the bottom of the tank body.

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