Automatic liquid suction device for measuring soil mechanical composition based on suction pipe method

Abstract

The utility model discloses an automatic liquid suction device for measuring soil mechanical composition based on a suction pipe method, which relates to the technical field of automatic liquid suction automation control, and can control the liquid suction end site and the liquid suction amount by adding a liquid level sensor at the scale position of a liquid suction pipe; meanwhile, the peristaltic pump and the three-way valve are combined for use, the three-way valve is communicated with the atmosphere and clear water, automatic switching of a liquid path and an air path can be achieved, and therefore liquid suction, liquid discharging, clear water washing, air emptying and other operations can be achieved on the liquid suction pipe; the PLC is used for controlling the operation of the liquid level sensor, the peristaltic pump, the three-way valve and other devices; soil related parameters can be input according to standard specification requirements for measuring soil mechanical composition through a suction pipe method, the liquid suction time is determined through an internal calculation function, and the liquid suction process is automatically completed. Related parameters of a plurality of samples can be accepted in the system, and the liquid suction sequence is reasonably optimized according to different liquid suction time of the plurality of samples, so that automatic liquid suction of the plurality of samples is realized, and the experiment time is shortened.

Description

TECHNICAL FIELD

[0001] The utility model relates to automatic liquid suction automation technical field, especially a kind of automatic liquid suction device based on straw method determination soil mechanical composition. BACKGROUND

[0002] 1, project background

[0003] Soil is composed of liquid, gas and solid three phases, and soil particles of different diameters are the main components of soil. Soil particle composition can reflect the source and development degree of soil parent material, and is the basis for dividing soil texture and an important basis for dividing soil types. Soil mechanical composition is an important physical detection index. Mechanical composition determination method: straw method; use specification: "soil analysis technical specification (second edition)", 5.1 straw method.

[0004] 2, working principle

[0005] Determination of soil mechanical composition includes specific gravity meter method, straw method and laser particle size analysis method. Straw method: sample is treated to form suspension, particles greater than 0.2mm are separated by sieve method; particles smaller than 0.2mm are calculated according to the Stokes law, the time required for soil particles of a certain particle size to settle to a certain depth is calculated, a certain volume of suspension is sucked at the depth at the time, and the mass of the suspension is weighed after drying, and the percentage of each particle content of soil is calculated. Straw method is one of the main methods for soil particle size analysis, and is the percentage of quality.

[0006] 3, main application and status

[0007] The steps of straw method for determining soil mechanical composition are roughly divided into: sample weighing, removing organic matter, decalcification and determination of washing loss, preparation of suspension, and sucking suspension. Among them, sucking suspension sample is the key point that needs to be broken through in this research project.

[0008] At present, the steps of sucking solution are as follows: the settling cylinder containing suspension is placed on a platform with small temperature change, the time required for each particle size to settle to a given depth in water is calculated according to the Stokes law formula, that is, the liquid suction time. Stir the suspension up and down with a stirring rod with holes for 1 min (30 times up and down, the hole piece of stirring rod should not be taken out of the liquid surface), start timing immediately after stirring, put the suction tube into the suspension gently 15s before the specified time (the bottom of the suction tube is inserted to 10cm below the liquid surface), and then suck the suspension with the suction instrument when the time reaches.

[0009] Suction instrument device is as Figure 1 Before use, rotate the three-way valve handle to A, at this time the piston is perpendicular to the upper and lower holes and communicates with the suction tube, which is in the state of liquid suction. At the same time, adjust the suction depth and the distance between the threaded top rod and the piston tail of hydraulic device, so that the suction suspension is about 25ml.

[0010] The main liquid suction process includes three steps: liquid suction, liquid discharge and cleaning.

[0011] During the liquid suction, if a syringe is used instead of a hydraulic device, the plug handle is first rotated to the A state, the syringe piston is pushed to exhaust the air inside the syringe, the suction tube is placed at a certain depth in the center of the sedimentation cylinder, the syringe piston is pulled, the suspension slowly rises, the upper edge of the suspension meniscus is tangent to the 25 mL scale of the suction tube, at this time the plug handle is rotated to the B state, at this time all plug holes are closed.

[0012] During the liquid discharge, the suction tube rack is lifted, the suction tube is moved out of the sedimentation cylinder, the plug handle is rotated to the C state in -3, at this time the piston horizontal hole is communicated with the ventilation branch pipe, the suspension flows out, and a high type weighing dish (such as an aluminum box) with a known mass is used to receive it. Figure 1

[0013] During the cleaning, the soil particles adhering to the wall of the suction tube can be washed by injecting a small amount of water from the branch funnel, and the washing liquid and the original liquid are collected in the weighing dish.

[0014] Main defects

[0015] In actual application process, the manual operation has large labor intensity, poor stability, and large batch sample analysis cannot be well scheduled and planned.

[0016] 4. Disadvantages of existing improved instruments and new practical devices

[0017] Some instruments only use the principle of the suction tube method, make large-scale changes to the experimental process and device, and do not meet the requirements of the soil mechanical composition determination standard; some instruments modify the parameters and instrument requirements of the soil mechanical composition determination standard method in the design and improvement process; some instrument designs are too large and are not suitable for laboratory promotion, and do not meet the requirements of soil general survey adaptability. Practical new type content

[0018] The purpose of the present application is to overcome the defects and disadvantages of the prior art, and provide an automatic liquid suction device for determining soil mechanical composition based on the suction tube method. The present application combines the method and technical requirements of the third national soil general survey on soil mechanical composition, and develops an automatic liquid suction device for determining soil mechanical composition based on the suction tube method.

[0019] The device can realize (1) reasonable planning and control of multiple samples in sequence by using a software interface (2) automatic liquid suction and discharge of the suction tube (3) automatic cleaning of the liquid suction device after the liquid suction is completed. Under the premise of strictly following the standard process of the suction tube method for determining soil mechanical composition, the working efficiency and automation level of determining soil mechanical composition are improved.

[0020] ​To achieve the above object, the utility model provides the following technical scheme:

[0021] An automatic liquid suction device based on the straw method for determining the mechanical composition of soil comprises a liquid level sensor, a PLC controller module, an alarm, a touch screen, a control button, a peristaltic pump, a three-way valve and a power controller.

[0022] As a further preferred scheme of the utility model, the liquid level sensor is placed at the scale of the liquid suction pipe, and when the liquid level rises to the scale line, the liquid level sensor can detect it and transmit a signal to the PCL controller to control the peristaltic pump to stop liquid suction.

[0023] As a further preferred scheme of the utility model, the alarm comprises a buzzer and a flash lamp, which are used to emit a buzzing sound and red light flashes to remind the detection personnel to operate and confirm the next operation.

[0024] As a further preferred scheme of the utility model, the touch screen is used for setting relevant parameters, including the input of sample information and the monitoring operation of the experimental process.

[0025] As a further preferred scheme of the utility model, the control button comprises three keys of liquid suction, liquid discharge and cleaning, which are used to control the device to perform relevant operations.

[0026] As a further preferred scheme of the utility model, a liquid path and a circuit are arranged between the liquid level sensor and the PLC controller module.

[0027] The liquid path is composed of a latex tube and is used to connect the liquid suction pipe, the three-way valve and the peristaltic pump inside the device.

[0028] The circuit is used to connect the liquid level sensor and the PLC controller inside the device and is used for signal feedback of the liquid level sensor.

[0029] As a further preferred scheme of the utility model, the peristaltic pump is connected with the three-way valve.

[0030] The peristaltic pump is used for liquid suction, liquid release and air exhaust.

[0031] The three-way valve is used for switching the liquid path and the air path.

[0032] The three-way valve is connected with the atmosphere and the clean water, and is used for automatically switching the liquid path and the air path, and is used for realizing the liquid suction, liquid release, clean water flushing and air exhaust of the liquid suction tube.

[0033] Compared with the prior art, the device has the following technical effects:

[0034] The liquid level sensor is added at the scale position of the liquid suction tube, so that the liquid suction end point and the liquid suction amount can be controlled; the peristaltic pump is used to replace the manual injector on the original device, and the automatic liquid suction process is used to replace the original manual liquid suction operation; the peristaltic pump and the three-way valve are used together, the three-way valve is connected with the atmosphere and the clean water, the automatic switching of the liquid path and the air path can be realized, so that the liquid suction, liquid release, clean water flushing and air exhaust of the liquid suction tube can be realized; the PLC controller is used to control the operation of the liquid level sensor, the peristaltic pump and the three-way valve; the device is provided with a touch control screen, the soil related parameters can be input according to the standard specification of the soil mechanical composition measured by the straw method, the liquid suction time is determined through the internal calculation function, and the liquid suction process is automatically completed. The system can accept the related parameters of multiple samples, and reasonably optimizes the liquid suction sequence of different liquid suction times of multiple samples, so that the automatic liquid suction of multiple samples is realized, and the experimental time is shortened. BRIEF DESCRIPTION OF DRAWINGS

[0035] The drawings described herein are used to provide further understanding of the device, and form part of the application, but do not constitute improper limitation on the device. In the drawings:

[0036] Figure 1 It is the structural principle diagram of the existing liquid suction instrument device of the device;

[0037] Figure 2 It is the structural principle diagram of the instrument structure intention of the device;

[0038] Figure 3 It is the sample insertion interface schematic diagram of the device;

[0039] Figure 4 It is the soil sample information input interface schematic diagram of the device;

[0040] Figure 5 It is the multiple sample queuing interface schematic diagram of the device;

[0041] Figure 6 It is the device touch screen liquid suction countdown interface schematic diagram of the device;

[0042] Figure 7 is the automatic cleaning interface schematic diagram of the device of the utility model;

[0043] Figure 8 is the running parameter setting schematic diagram of the device of the utility model;

[0044] Figure 9 is the device of the utility model. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model:

[0046] As shown in Figure 1 , Figure 2 and Figure 9 , an automatic liquid suction device based on a pipette method for determining soil mechanical composition comprises a liquid level sensor, a PLC controller module, an alarm, a touch screen, a control button, a peristaltic pump, a three-way valve and a power controller. The output end of the liquid level sensor is connected to the input end of the PLC controller module. The alarm, the touch screen, the control button, the peristaltic pump and the three-way valve are connected to the PLC controller module. The power controller is connected to the liquid level sensor, the PLC controller module, the alarm, the touch screen, the control button, the peristaltic pump and the three-way valve to provide required power.

[0047] The liquid level sensor is placed at the scale of the liquid suction tube. When the liquid level rises to the scale line, the liquid level sensor can detect it and transmit a signal to the PCL controller to control the peristaltic pump to stop liquid suction.

[0048] The alarm comprises a buzzer and a flash lamp to emit a buzzing sound and red light flashes to remind the detection personnel to operate and confirm the next operation.

[0049] The touch screen is used for setting related parameters, including inputting sample information and monitoring operation of the experimental process.

[0050] The control button comprises three keys of liquid suction, liquid discharge and cleaning to control the device to perform related operations.

[0051] A liquid circuit and an electric circuit are arranged between the liquid level sensor and the PLC controller module.

[0052] The liquid path is formed by a latex tube, and is used for connecting the suction tube and the three-way valve and the peristaltic pump inside the device.

[0053] The circuit is used for connecting the liquid level sensor and the PLC controller inside the device, and is used for signal feedback of the liquid level sensor.

[0054] The peristaltic pump is connected with the three-way valve.

[0055] The peristaltic pump is used for suction, release and air emptying of the liquid.

[0056] The three-way valve is used for switching of the liquid path and the air path.

[0057] The three-way valve is connected with the atmosphere and the clean water, and is used for automatic switching of the liquid path and the air path, and is used for realizing suction, release, clean water flushing and air emptying of the suction tube.

[0058] The device is developed on the basis of the suction tube which is the main device for measuring soil mechanical composition by the suction tube method. The liquid level sensor is added at the scale position of the suction tube, so that the suction end point and the suction amount can be controlled. The peristaltic pump is used to replace the manual injector on the original device, and the automatic suction process is used to replace the original manual suction operation. Meanwhile, the peristaltic pump and the three-way valve are used in combination, the three-way valve is connected with the atmosphere and the clean water, and the automatic switching of the liquid path and the air path can be realized, so that the suction, release, clean water flushing and air emptying of the suction tube can be realized. The operation of the liquid level sensor, the peristaltic pump and the three-way valve and the like is controlled by the PLC controller. The device is provided with a touch control screen, and the soil related parameters can be input according to the standard specification requirements of the suction tube method for measuring soil mechanical composition. The suction time is determined by the internal calculation function, and the automatic suction process is completed. The system can accept the related parameters of multiple samples, and the suction sequence of different suction times of multiple samples is reasonably optimized, so that the automatic suction of multiple samples is realized, and the experimental time is shortened.

[0059] By using the device, the automatic suction, release, clean water flushing and air emptying of the suction tube can be realized in the process of measuring soil mechanical composition by using the suction tube. The touch screen control of the device can reasonably plan and arrange the suction sequence of multiple different soil samples, optimize the time consumption of large-scale experiments, and effectively improve the detection and analysis efficiency.

[0060] In the analysis process, after the soil sample is prepared into a suspension after pretreatment, the sample information is input through the touch screen of the device. After stirring is completed, start is clicked, and the device automatically starts experiment timing. When the pre-warning time of liquid suction is reached, the device automatically issues an alarm, reminding the operator to place the suction tube connected to the device in the settling cylinder, and confirming that liquid suction can be performed. When the liquid suction time countdown ends, the device controls the peristaltic pump to automatically perform liquid suction, and when the sucked liquid reaches the scale line, liquid suction is stopped through the liquid level controller. The suction tube is removed from the settling cylinder, a high-type weighing dish or an aluminum box is placed at the lower end of the suction tube according to the standard process requirement, the liquid discharge button on the touch screen is clicked, the liquid in the suction tube can be automatically discharged into the container, and then the cleaning button is clicked. The device can automatically suck a small amount of clean water to clean the suction tube. After cleaning, it indicates that the liquid suction operation of this time has been completed, and the device system will automatically start the second liquid suction time countdown. If it is a plurality of sample experiments, the liquid suction countdown of the next sample will be performed in between, and then the above operation is repeated, so that the automatic liquid suction process of a plurality of samples is realized.

[0061] The device can realize the automatic liquid suction process of the suction tube to the soil suspension, reasonably arrange the liquid suction sequence of a large number of samples, effectively reduce manual operation, and improve work efficiency.

[0062] The sample insertion interface is as shown in Figure 3 .

[0063] The operation steps are as follows:

[0064] (1) Turn on the power supply and start the instrument.

[0065] (2) When the soil sample pretreatment is completed, the soil suspension is prepared and placed in a 1L settling cylinder.

[0066] (3) In the touch screen of the device, as shown in Figure 3 , click the lower left corner “insert sample”. The page jumps to the experimental sample parameter setting, as shown in Figure 4 . In the interface, input the sample number, graduated cylinder number, liquid temperature, insertion graduated cylinder depth and soil specific gravity and other related parameters. According to the input temperature, the corresponding water density and viscosity coefficient are automatically obtained from the table in the upper right corner.

[0067] The soil sample information input interface is as shown in Figure 4 .

[0068] (4) The system prompts whether the data is correct, and then “start calculation” is pressed. The system will calculate the specific time of 2 times of liquid suction of the sample according to the calculation principle of “suction tube method for determining soil mechanical composition”-Stokes formula.

[0069] (5) After the sample stirring is completed, “confirm input” is clicked, the sample enters the device liquid suction queue sequence, and the countdown for liquid suction operation starts.

[0070] (6) During this period, the relevant information of multiple samples can be input, and the samples will be queued for the liquid suction operation. As shown in Figure 5 .

[0071] Figure 5 Multiple sample queuing interface

[0072] (7) When the countdown reaches the preset time, the device alarm will start, reminding the detection personnel to prepare for liquid suction. The suction tube connected to the device is placed above the corresponding settling cylinder. When the countdown is 15s, insert the suction tube and adjust the insertion depth to 10cm, then start the liquid suction button below the touch screen to confirm that the device liquid suction preparation work has been completed. The interface is shown in Figure 6 .

[0073] (8) When the countdown in the interface liquid suction instruction box ends, the internal peristaltic pump of the device starts, and the liquid in the suction tube begins to be sucked, and the liquid level starts to rise. When the liquid level rises to the scale line, it is detected by the liquid level sensor, and the liquid level sensor gives a signal to stop the liquid suction.

[0074] (9) Gently remove the suction tube from the settling cylinder, place a high-type weighing dish below it, and start the "liquid release" button. The peristaltic pump will start to discharge the liquid in the suction tube to the high-type weighing dish.

[0075] (10) After the liquid release is completed, start the "cleaning" button. The device will suck the backup clean water through the peristaltic pump to flush the suction tube several times in small amounts. After the clean water is washed, the three-way valve is switched to the gas path, and the suction tube is blown through the peristaltic pump to exhaust the liquid inside. The cleaning interface is shown in Figure 7 .

[0076] The automatic cleaning interface of the device is shown in Figure 7 .

[0077] (11) After cleaning is completed, the first liquid suction process of this sample has ended, and the device prompts the next operation.

[0078] (12) The related parameter settings of the device operation are shown in Figure 8 , which can be set according to different experimental requirements.

[0079] Test example of the present patent:

[0080] 1.1 Test method: After pretreatment, the soil sample is placed in the settling cylinder, and the liquid suction is performed by using the device

[0081] Operation. Compare the results of automatic liquid suction device and manual liquid suction to verify the operation effect of the device.

[0082] Soil sample pretreatment process: take 0.2g of soil sample, place it in a 250ml tall beaker, add water to wet it, add 1mol / L hydrochloric acid solution dropwise to remove carbonates, and wash with water until the supernatant is neutral. Remove organic matter with 30% hydrogen peroxide solution under heating. Finally, add 1mol / L sodium hydroxide solution dropwise, and ultrasonic to disperse the particles in the sample. Transfer the treated sample to a 1L settling cylinder, and prepare for determination.

[0083] The sample is placed in the automatic liquid suction device developed in this project for liquid suction operation. After the instrument parameters are set, the sample related parameter information is input through the touch screen, and the calculation is clicked. When the sample stirring is completed, click insert sample, and the sample enters the queue list. When the device alarm sounds, place the suction tube above the settling cylinder, click the "suction" button, and confirm that the preparation is complete. When the countdown is 15s, insert the suction tube to 10cm below the liquid surface, and when the time is up, the device automatically starts suction, stops when the specified amount is sucked. Remove the settling cylinder, place the high-type weighing dish under the suction tube, start the "liquid discharge" button, and the device starts to discharge the liquid in the suction tube into the high-type weighing dish. After the liquid discharge is completed, start the "cleaning" button, and the device sucks the reserved clean water to clean the suction tube, discharges the cleaning liquid to the high-type weighing dish, and uses air to discharge the liquid in the suction tube. After the liquid suction is completed, the subsequent determination is carried out according to the standard experimental procedure.

[0084] Determination result: the detection result of the automatic liquid suction device is basically consistent with the manual result. The automatic liquid suction device only automates the manual liquid suction process, and whether the liquid suction amount is accurate and the repeatability of the liquid suction amount is the main index for testing whether the device is qualified. The following uses water instead of soil suspension to perform automatic liquid suction and manual liquid suction. The liquid weight after liquid suction is weighed to represent the analysis result.

[0085] 2.2 Result analysis: the results of 5 repeated tests are shown in the following table. It can be found from the results that the liquid amount sucked by the automatic liquid suction device is similar to that of manual liquid suction, but the sample repeatability of the automatic liquid suction device is better! Table 1 shows the liquid suction amount of multiple repeated manual liquid suction and automatic liquid suction.

[0086] Table 1

[0087]

[0088] The above only describes the preferred embodiments of the utility model, and equivalent changes or modifications made according to the structure, features and principles described in the utility model patent application range are included in the utility model patent application range.

[0089] As will be understood by one of ordinary skill in the art upon reading the present disclosure, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless otherwise defined. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the specification and relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0090] The above embodiments only illustrate the technical idea of the present application, and cannot limit the protection scope of the present application. Any modification made on the basis of the technical scheme according to the technical idea of the present application falls within the protection scope of the present application. The embodiments of the present application are described in detail above, but the present application is not limited to the above embodiments. Within the knowledge range of those skilled in the art, various changes can be made without departing from the purpose of the present application.

Claims

1. An automatic pipette device for determining the mechanical composition of soil based on the pipette method, characterized in that: The device comprises a liquid level sensor, a PLC controller module, an alarm, a touch screen, control buttons, a peristaltic pump, a three-way valve, and a power controller. The output of the liquid level sensor is connected to the input of the PLC controller module. The alarm, the touch screen, the control buttons, the peristaltic pump, and the three-way valve are connected to the PLC controller module. The power controller is connected to the liquid level sensor, the PLC controller module, the alarm, the touch screen, the control buttons, the peristaltic pump, and the three-way valve to provide the required power. The liquid level sensor is placed at the scale of the pipette to detect the liquid level when it rises to the scale line and send a signal to the PCL controller to stop the peristaltic pump. A liquid circuit and an electric circuit are provided between the liquid level sensor and the PLC controller module. The liquid circuit is composed of a latex tube to connect the pipette, the three-way valve, and the peristaltic pump inside the device. The electric circuit is used to connect the liquid level sensor and the PLC controller inside the device to feedback the signal of the liquid level sensor. The peristaltic pump is connected to the three-way valve. The peristaltic pump is used to suck, release, and empty the air of the liquid. The three-way valve is used to switch the liquid circuit and the air circuit.

2. The automatic pipette device for determining the mechanical composition of soil according to claim 1, characterized in that: The alarm comprises a buzzer and a flash light to emit a buzzing sound and a red light to remind the detector to operate and confirm the next operation.

3. The automatic pipette device for determining the mechanical composition of soil according to claim 1, characterized in that: The touch screen is used to set the relevant parameters, including the input of sample information and the monitoring of experimental process.

4. The automatic pipette device for determining the mechanical composition of soil according to claim 1, characterized in that: The control buttons include three keys for sucking, releasing, and cleaning to control the device to operate.

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