A sedimentation method soil particle analyzer and analysis method

Abstract

The present invention discloses a soil particle analyzer and analysis method using a sedimentation method, including: a gearbox; a mounting hole is provided in the middle of the top surface of the gearbox; a column is a hollow structure, and the hollow hole provided in the column corresponds to the size of the mounting hole; a lifting bracket passes through the hollow hole and the mounting hole, and is connected to the gearbox in a transmission manner; a turntable; the turntable is rotatably arranged at the bottom of the column through a bearing; the turntable is arranged above the gearbox and is arranged parallel to the top surface of the gearbox; a plurality of placement grooves are provided on the top surface of the turntable; the placement grooves are distributed in an array about the center of the turntable; a sedimentation cylinder is fixedly arranged in the placement groove; the top of the stirring rod is installed on the lifting bracket, and the bottom of the stirring rod extends into the inner cavity of the sedimentation cylinder. The present application can reduce labor and improve efficiency by setting a gearbox to control mechanical stirring of the stirring rod. Multiple sets of sedimentation cylinders can be set to analyze multiple samples at the same time; the height of each part of the structure of the present application is convenient to adjust, which basically conforms to human mechanics, reduces fatigue, and improves detection efficiency.

Description

Technical Field

[0001] The invention relates to the fields of agronomy, environmental science and soil particle analysis technology, and in particular to a sedimentation method soil particle analyzer and an analysis method. Background Art

[0002] Soil particle size distribution and microaggregate conditions determine a variety of soil physical and chemical properties and are important indicators of soil fertility. The sedimentation-straw method is considered to be the standard method for measuring the distribution of soil particles with a particle size of 0.002-0.05 mm. However, the traditional straw device is complicated to assemble and cumbersome to operate. The stirring work before the test consumes a lot of arm strength. Existing large-scale devices are expensive, complex in composition, and have limited test methods.

[0003] Currently, there is a lack of an instrument that is simple, flexible, can accurately sample, and reduces workload. Summary of the invention

[0004] The purpose of the present invention is to provide a sedimentation method soil particle analyzer and analysis method to solve the problems existing in the above-mentioned prior art, thereby reducing labor costs and improving utilization efficiency.

[0005] To achieve the above object, the present invention provides the following solution: The present invention provides a sedimentation method soil particle analyzer, comprising:

[0006] Gear box; a mounting hole is provided in the middle of the top surface of the gear box;

[0007] The column is vertically arranged; the bottom of the column is fixedly mounted on the top surface of the gear box; the column is a hollow structure, and the hollow hole opened in the column corresponds to the size of the mounting hole;

[0008] A lifting bracket; the lifting bracket passes through the hollow hole and the mounting hole, and is drivingly connected to the gear box;

[0009] A turntable; the turntable is rotatably arranged at the bottom of the column through a bearing; the turntable is arranged above the gear box and parallel to the top surface of the gear box; a plurality of placement grooves are opened on the top surface of the turntable; the placement grooves are distributed in an array about the center of the turntable;

[0010] Sedimentation cylinder; the sedimentation cylinder is fixedly arranged in the placement groove;

[0011] A stirring rod, the top end of which is mounted on the lifting bracket, and the bottom end of which extends into the inner cavity of the sedimentation cylinder.

[0012] A pipette support is also installed on the column; a receiving groove is downwardly opened on one side of the top surface of the column; the pipette support is placed in the receiving groove;

[0013] A pipette is installed on the pipette bracket.

[0014] The liquid pipette includes a liquid storage bubble, a middle piston, a top piston, a liquid return pipe and a straight pipe; the middle piston and the top piston are both three-way piston valves; the top end of the liquid storage bubble is connected to one port of the top piston, and the bottom end of the liquid storage bubble is connected to one port of the middle piston; the top end of the straight pipe is connected to the other port of the middle piston; the liquid return pipe is connected to the remaining port of the middle piston.

[0015] A liquid inlet hole is provided on the side wall at the bottom end of the straight tube; the liquid inlet hole horizontally penetrates the side wall of the straight tube.

[0016] The side wall of the column is also fixedly mounted with a water bottle bracket; the water bottle bracket is an "L" structure; a water bottle is fixedly mounted on the top of the water bottle bracket; the water bottle is connected to a port of the top piston through a hose.

[0017] The side wall of the column is also fixedly mounted with a flow guide frame; and a flow guide pipe is slidably mounted on the flow guide frame.

[0018] A clamping groove is formed at one end of the bracket away from the column, and the stirring rod is fixedly installed in the clamping groove.

[0019] An analysis method of a sedimentation soil particle analyzer comprises the following steps:

[0020] Step 1: Stirring: pour the soil suspension to be tested into the sedimentation cylinder, fix the stirring rod to the lifting bracket, and insert the other end of the stirring rod into the soil suspension to be tested, and stir by lifting and lowering the stirring rod;

[0021] Step 2: Liquid aspiration: after the stirring in step 1 is completed, the stirring rod is taken out, the timing is started, the liquid pipette is lifted, the turntable is rotated, the sedimentation cylinder is moved below the liquid pipette, the liquid pipette is dropped onto the liquid pipette bracket, and liquid aspiration is started;

[0022] Step 3: diversion, lift the pipette, place the front end of the guide frame under the pipette, prepare a beaker, rotate the middle piston, and divert the remaining suspension in the pipette through the front end of the guide frame to the waste beaker, connect the water bottle to one end of the pipette through a hose, rotate the top piston, and release 20 ml of water to rinse the pipette, and the rinsed liquid also flows through the front end of the guide frame to the waste beaker;

[0023] Step 4: Weighing calculation, heat the suspension in the beaker and evaporate it to dryness, use a balance to weigh the mass of the solid particles, and multiply the measured mass of the particles by the fractionation multiple to get the content of the substance in the suspension. Based on this content and the mass of the experimental soil, calculate the percentage of soil particles of the corresponding particle size.

[0024] During stirring in step 1, the stirring speed is 25-35 times / minute, the stirring time is 1-1.5 minutes, and the stirring amplitude of the stirring rod is 30 cm, from 1 cm below the liquid surface to the bottom of the sedimentation tube.

[0025] In step 2, the volume of liquid aspirated is 20 ml. When the volume of liquid aspirated exceeds 20 ml, the liquid is stored in the liquid storage bubble, and the middle piston is rotated to be discharged back into the sedimentation cylinder through the lower opening of the liquid return pipe.

[0026] The present invention discloses the following technical effects: the present invention can reduce labor and improve efficiency by setting a gear box to control the mechanical stirring of the stirring rod. Multiple sets of sedimentation cylinders can be set to compare multiple samples at the same time; the height of each part of the structure of the present invention is convenient to adjust, basically conforms to human mechanics, reduces fatigue, and improves detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the pipette of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of the pipette support of the present invention;

[0031] Figure 4 It is a schematic diagram of the column structure of the present invention;

[0032] Figure 5 This is an enlarged schematic diagram of the flow guide frame structure connection at location A of the present invention;

[0033] Figure 6 This is a schematic structural diagram of a gearbox embodiment 1 of the present invention;

[0034] Figure 7 This is a schematic top view of the structure of a gearbox embodiment 1 of the present invention;

[0035] Figure 8This is a schematic structural diagram of a second embodiment of a gearbox according to the present invention;

[0036] Fig. 9 This is a schematic top view of the structure of the second embodiment of the gearbox of the present invention;

[0037] Among them, there are gear box 1, turntable 2, sedimentation cylinder 3, stirring rod 4, lifting bracket 5, pipette bracket 6, water discharge bottle 7, water discharge bottle bracket 8, guide frame 9, column 10, pipette 11, liquid storage bubble 12, middle piston 13, top piston 14, liquid return pipe 15, liquid suction hole 16, straight pipe 17, eccentric wheel 18, connecting rod 19, drive shaft 20, drive gear 21, fixed short shaft 22, transmission rod 23, transmission short shaft 24, frame 25, vertical through groove 26, horizontal frame 27, slider 28, first transmission sprocket 29, second transmission sprocket 30, third transmission sprocket 31, and fourth transmission sprocket 32. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] The present invention provides a sedimentation method soil particle analyzer, comprising:

[0041] Gear box 1; a mounting hole is provided in the middle of the top surface of the gear box 1;

[0042] The column 10 is vertically arranged; the bottom of the column 10 is fixedly mounted on the top surface of the gear box 1; the column 10 is a hollow structure, and the hollow hole opened in the column 10 corresponds to the size of the mounting hole;

[0043] Lifting bracket 5; the lifting bracket 5 passes through the hollow hole and the mounting hole, and is transmission-connected to the gear box 1;

[0044] The turntable 2 is rotatably disposed at the bottom of the column 10 through a bearing; the turntable 2 is disposed above the gearbox 1 and is disposed parallel to the top surface of the gearbox 1; a plurality of placement grooves are provided on the top surface of the turntable 2; the placement grooves are distributed in an array about the center of the turntable 2;

[0045] Sedimentation cylinder 3; Sedimentation cylinder 3 is fixedly arranged in the placement tank;

[0046] A stirring rod 4 , the top end of which is mounted on a lifting bracket 5 , and the bottom end of which extends into the inner cavity of the sedimentation cylinder 3 .

[0047] A pipette support 6 is also mounted on the column 10; a receiving groove is downwardly opened on one side of the top surface of the column 10; the pipette support 6 is placed in the receiving groove;

[0048] A pipette 11 is mounted on the pipette support 6 .

[0049] The pipette 11 includes a liquid storage bubble 12, a middle piston 13, a top piston 14, a liquid return pipe 15 and a straight pipe 17; the middle piston 13 and the top piston 14 are both three-way piston valves; the top end of the liquid storage bubble 12 is connected to one port of the top piston 14, and the bottom end of the liquid storage bubble 12 is connected to one port of the middle piston 13; the top end of the straight pipe 17 is connected to another port of the middle piston 13; the liquid return pipe 15 is connected to the remaining port of the middle piston 13.

[0050] A liquid inlet hole 16 is formed on the side wall at the bottom end of the straight tube 17 ; the liquid inlet hole 16 passes through the side wall of the straight tube 17 horizontally.

[0051] The side wall of the column 10 is also fixedly mounted with a water bottle holder 8; the water bottle holder 8 is an "L" structure; a water bottle 7 is fixedly mounted on the top of the water bottle holder 8; the water bottle 7 is connected to a port of the top piston 14 through a hose.

[0052] A flow guide frame 9 is also fixedly mounted on the side wall of the column 10 ; a flow guide pipe is slidably mounted on the flow guide frame 9 .

[0053] A clamping groove is formed at one end of the lifting bracket 5 away from the column 10 , and the stirring rod 4 is fixedly installed in the clamping groove.

[0054] An analysis method of a sedimentation soil particle analyzer comprises the following steps:

[0055] Step 1: Stirring: pour the soil suspension to be tested into the sedimentation cylinder, fix the stirring rod to the lifting bracket, and insert the other end of the stirring rod into the soil suspension to be tested, and stir by lifting and lowering the stirring rod;

[0056] Step 2: Liquid aspiration: after the stirring in step 1 is completed, the stirring rod is taken out, the timing is started, the liquid pipette is lifted, the turntable is rotated, the sedimentation cylinder is moved below the liquid pipette, the liquid pipette is dropped onto the liquid pipette bracket, and liquid aspiration is started;

[0057] Step 3: diversion, lift the pipette, place the front end of the guide frame under the pipette, prepare a beaker, rotate the middle piston, and divert the remaining suspension in the pipette through the front end of the guide frame to the waste beaker, connect the water bottle to one end of the pipette through a hose, rotate the top piston, and release 20 ml of water to rinse the pipette, and the rinsed liquid also flows through the front end of the guide frame to the waste beaker;

[0058] Step 4: Weighing calculation, heat the suspension in the beaker and evaporate it to dryness, use a balance to weigh the mass of the solid particles, and multiply the measured mass of the particles by the fractionation multiple to get the content of the substance in the suspension. Based on this content and the mass of the experimental soil, calculate the percentage of soil particles of the corresponding particle size.

[0059] During stirring in step 1, the stirring speed is 25-35 times / minute, the stirring time is 1-1.5 minutes, and the stirring amplitude of the stirring rod is 30 cm, from 1 cm below the liquid surface to the bottom of the sedimentation tube.

[0060] In step 2, the volume of liquid aspirated is 20 ml. When the volume of liquid aspirated exceeds 20 ml, the liquid is stored in the liquid storage bubble, and the middle piston is rotated to be discharged back into the sedimentation cylinder through the lower opening of the liquid return pipe.

[0061] In one embodiment of the present invention, the specific use of the analyzer is to place the soil suspension to be tested into the sedimentation tube 3, put the stirring rod 4 into the suspension, and fix it to the lifting bracket 5 for stirring. The stirring speed is 30 times / minute, the amplitude is 30cm, from 1cm below the liquid surface to the bottom of the sedimentation tube 3, and stir for 1 minute. After stirring, take out the stirring rod 4 and start timing. Lift the pipette 11, turn the turntable 2, and move the sedimentation tube 3 to just below the pipette 11. When the designed time is reached, drop the pipette onto the pipette bracket 6 and start imbibing. The imbibed volume is 20mL. If exceeded, it is stored in the liquid storage bubble 12, the middle piston 13 is rotated, and the liquid is discharged back to the sedimentation tube 3 through the lower opening of the return pipe 15. Lift the pipette 11, move the guide frame 9 so that its front end is under the pipette 11, and prepare a beaker for storing the suspension, rotate the middle piston 13, so that the suspension in the pipette 11 is guided into the beaker through the front end of the guide frame 9. Use a hose to connect the water bottle 7 to the left end of the pipette 11, rotate the top piston 14, and release about 20 mL of water to rinse the pipette 11. The rinsing water is also guided into the beaker through the front end of the guide frame 9.

[0062] Step 4: Weighing calculation, heat the suspension in the beaker to dryness, dry at 105°C, use a balance including but not limited to 1 / 10,000 to weigh the mass of the solid particles, and multiply the mass of the measured particles by the fractionation multiple, where the fractionation multiple is calculated as: fractionation multiple = constant volume / fractionation volume, i.e. 1000ml / 20ml = 50, and the content of the substance in the suspension is obtained. According to this content and the mass of the experimental soil, the percentage of soil particles of the corresponding particle size is calculated. This method is suitable for measuring soil particles and microaggregates between 0.002-0.05mm.

[0063] One-tenth of a ten-thousandth balance is used to weigh the mass of an object. One-tenth of a ten-thousandth balance generally uses strain sensors, capacitive sensors, and electromagnetic balance sensors. Strain sensors have a simple structure and low cost, but their accuracy is limited and they cannot achieve very high accuracy; capacitive sensors have fast weighing speed and high cost performance, but they cannot achieve very high accuracy; electronic balances using electromagnetic balance sensors. They are characterized by accurate and reliable weighing, fast and clear display, and automatic detection systems, simple automatic calibration devices, and overload protection devices.

[0064] Notes when using: 1. Move slowly and gently: slowly open the lifting pivot and open it to the maximum position, and slowly turn the ring code to prevent the ring code from falling off or misaligned. 2. The weighing object cannot be placed directly on the weighing pan. Depending on the different properties of the weighing object, it can be placed on a piece of paper, a watch glass or a weighing bottle. Do not weigh objects that exceed the maximum load of the balance. 3. Do not replace the balance during the same weighing process to avoid relative errors.

[0065] This measurement method meets the requirements of Stocks' law. Stocks' law means that when an object moves at a constant speed in a viscous fluid, a layer of liquid adheres to the surface of the object. There is internal friction between this liquid layer and its adjacent liquid layer. Therefore, the object must overcome this resistance during movement. If the object is spherical and the liquid moves in laminar flow relative to the sphere, if R is the radius of the sphere, υ is its speed relative to the liquid, and η is the viscosity coefficient of the liquid, the formula becomes Stokes' law. According to Stokes' calculation, the resistance of the sphere is: F = 6πηυR.

[0066] In one embodiment of the present invention, the turntable 2 allows the instrument to do 8 samples in sequence, taking up little space. If space permits, the number of samples can be appropriately expanded by extending the diameter of the turntable 2 and the length of the lifting bracket 5, the pipette bracket 6 and the guide bracket 9. Mechanical stirring can reduce labor and improve efficiency. The present invention is highly suitable, basically conforms to human mechanics, and reduces fatigue.

[0067] In one embodiment of the present invention, Figure 3 and 4Circular blocking blocks are provided at both ends of the pipette bracket 6, and sliding protrusions are provided at the contact point between the pipette bracket 6 and the wall of the accommodating groove; so that the pipette bracket 6 will not fall easily when moving upward; a moving groove is also provided on the side wall adjacent to the accommodating groove and the column 10; a mounting column is also fixedly installed in the middle of the pipette bracket 6; one end of the mounting column is fixedly connected to the pipette bracket 6, and the other end is fixedly connected to a fixing ring; the pipette 11 is installed in the fixing ring.

[0068] In one embodiment of the present invention, Figure 4 and 5 A guide groove is horizontally opened at 1 / 3 of the height of the column 10; fixed protrusions are formed inwardly at the top and bottom of the guide groove; a sliding groove is opened at the bottom of the top of the guide frame; the sliding groove corresponds to the position of the fixed protrusion, and a number of slots are evenly spaced in the sliding groove, and the fixed protrusion is limited to any two adjacent slots.

[0069] In one embodiment of the present invention, Figure 6 and 7 The gear box 1 includes an eccentric wheel connecting rod mechanism; the eccentric wheel connecting rod mechanism includes a frame, an eccentric wheel 18, a connecting rod 19, a drive shaft 20, a drive gear 21, and a transmission part; the connecting rod 19 is vertically arranged on the lifting bracket 5 and fixedly connected, and the eccentric wheel 18 and the connecting rod 19 are both installed on the frame; the middle part of the drive shaft 20 is connected to the drive gear through a key, and one end of the drive shaft 20 is keyed to the eccentric wheel 18; a fixed short shaft 22 is also fixedly installed on the outer periphery of the eccentric wheel 18; the drive gear 21 is meshed with the gear on the output shaft of the motor.

[0070] The transmission part includes a transmission rod 23; circular holes are respectively opened at both ends of the transmission rod 23; the circular hole at the bottom end of the transmission rod 23 is transmission-connected to the fixed short shaft 22 through a bearing; a transmission mounting part is opened at the bottom end of the connecting rod 19, and a transmission short shaft 24 is formed on the transmission mounting part; the circular opening at the top end of the transmission rod 23 is installed on the transmission short shaft 24 through a bearing.

[0071] When the motor drives the transmission shaft 20 through the driving gear 21 to start rotating; the transmission shaft 20 drives the eccentric wheel 18 to rotate; the fixed short shaft 22 on the eccentric wheel 18 makes a circular motion around the transmission shaft 20; the transmission rod 23 connected to the fixed short shaft 22 rotates up or down with the fixed short shaft 22, driving the connecting rod 19 to rise or fall to complete the lifting process; the connecting rod 19 drives the lifting bracket 5 to rise and fall, and the lifting bracket 5 drives the stirring rod 4 to stir up and down.

[0072] In another embodiment of the present invention, the gear box 1 includes a chain, four transmission sprockets 24 and a frame 25, as shown in the attached Figure 8The arrangement is shown in the figure; the frame 25 is fixedly installed in the gear box 1; the centers of the four transmission sprockets 24 are all equipped with transmission shafts, and each transmission shaft is provided with a transmission gear, which meshes with the gear on the motor output shaft; a vertical through slot 26 is provided on the frame 25, and the bottom end of the lifting bracket 5 is provided in the vertical through slot 26, and the bottom end of the lifting bracket 5 is also fixedly connected to the horizontal frame 27; the horizontal frame 27 is hollow inside, and a slider 28 is slidably provided; the slider 28 is fixed to a section of the chain The first transmission sprocket 29 is arranged at one side of the top of the frame 25; the second transmission sprocket 30 is arranged in the middle of the frame 25, and is arranged below the first transmission sprocket 29, and is on the opposite side of the first transmission sprocket 29; the third transmission sprocket 31 is arranged in the middle of the frame, and corresponds to the position of the vertical through slot 26, and is arranged below the second transmission sprocket 30; the fourth transmission sprocket 32 ​​is arranged at the bottom of the frame 25, and is arranged below the third transmission sprocket 31, and corresponds to the position of the first transmission sprocket 29. The space in the horizontal frame 27 can accommodate the extreme position of the slider 28 on the right side of the first transmission sprocket 29 and the left side of the second transmission sprocket 30. The chain passes from the upper end of the first transmission sprocket 29 to the upper end of the second transmission sprocket 30, passes through the lower end of the second transmission sprocket 30, to the upper end of the third transmission sprocket 31, passes through the lower end of the third transmission sprocket 31 to the lower end of the fourth transmission sprocket 32, and finally passes through the right side of the first transmission sprocket 29 to the upper end of the first transmission sprocket 29; when the motor drives the four transmission sprockets 24 to rotate in the same direction, the chain moves with the sprocket, and the slider 28 is fixedly connected to a section of the chain. As the chain moves up and down, since the horizontal frame 27 is fixedly connected to the lifting bracket 5, the slider 28 slides in the horizontal frame 27, so that the lifting bracket 5 rises or falls with the movement of the chain to complete the lifting process.

[0073] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0074] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A sedimentation method soil particle analyzer, characterized in that: include: A gear box (1); a mounting hole is provided in the middle of the top surface of the gear box (1); A column (10); the column (10) is arranged vertically; the bottom of the column (10) is fixedly mounted on the top surface of the gear box (1); the column (10) is a hollow structure, and the hollow hole provided in the column (10) corresponds to the size adaptation position of the mounting hole; A lifting bracket (5); the lifting bracket (5) passes through the hollow hole and the mounting hole, and is drivingly connected to the transmission device in the gear box (1); A turntable (2); the turntable (2) is rotatably arranged at the bottom of the column (10) via a bearing; the turntable (2) is arranged above the gear box (1) and is arranged parallel to the top surface of the gear box (1); a plurality of placement grooves are formed on the top surface of the turntable (2); the placement grooves are arranged in an array around the center of the turntable (2); A sedimentation cylinder (3); the sedimentation cylinder (3) is fixedly arranged in the placement groove; A stirring rod (4), wherein the top end of the stirring rod (4) is mounted on the lifting bracket (5), and the bottom end of the stirring rod (4) extends into the inner cavity of the sedimentation cylinder (3); A pipette support (6) is also mounted on the column (10); a receiving groove is provided downwardly on one side of the top surface of the column (10); and the pipette support (6) is placed in the receiving groove; A pipette (11) is mounted on the pipette support (6); The liquid pipette (11) comprises a liquid storage bubble (12), a middle piston (13), a top piston (14), a liquid return pipe (15) and a straight pipe (17); the middle piston (13) and the top piston (14) are both three-way piston valves; the top end of the liquid storage bubble (12) is connected to a port of the top piston (14), and the bottom end of the liquid storage bubble (12) is connected to a port of the middle piston (13); the top end of the straight pipe (17) is connected to another port of the middle piston (13); and the liquid return pipe (15) is connected to the remaining port of the middle piston (13); A liquid inlet hole (16) is provided on the side wall at the bottom end of the straight tube (17); the liquid inlet hole (16) horizontally penetrates the side wall of the straight tube (17); A water bottle holder (8) is also fixedly mounted on the side wall of the upright column (10); the water bottle holder (8) is an "L" structure; a water bottle (7) is fixedly mounted on the top of the water bottle holder (8); the water bottle (7) is connected to a port of the top piston (14) via a hose.

2. A sedimentation method soil particle analyzer according to claim 1, characterized in that: A flow guide frame (9) is also fixedly mounted on the side wall of the upright column (10); a flow guide pipe is slidably mounted on the flow guide frame (9).

3. The sedimentation method soil particle analyzer according to claim 1, characterized in that: A clamping groove is formed at one end of the lifting bracket (5) away from the column (10), and the stirring rod (4) is fixedly mounted in the clamping groove.

4. The analysis method of a sedimentation soil particle analyzer according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1: Stirring: pour the soil suspension to be tested into the sedimentation cylinder, fix the stirring rod to the lifting bracket, and insert the other end of the stirring rod into the soil suspension to be tested, and stir by lifting and lowering the stirring rod; Step 2: Liquid aspiration: after the stirring in step 1 is completed, the stirring rod is taken out, the timing is started, the liquid pipette is lifted, the turntable is rotated, the sedimentation cylinder is moved below the liquid pipette, the liquid pipette is dropped onto the liquid pipette bracket, and liquid aspiration is started; Step 3: diversion, lift the pipette, place the front end of the guide frame under the pipette, prepare a beaker, rotate the middle piston, and divert the remaining suspension in the pipette through the front end of the guide frame to the waste beaker, connect the water bottle to one end of the pipette through a hose, rotate the top piston, and release 20 ml of water to rinse the pipette, and the rinsed liquid also flows through the front end of the guide frame to the waste beaker; Step 4: Weighing calculation, heat the suspension in the beaker and evaporate it to dryness, use a balance to weigh the mass of the solid particles, and multiply the measured mass of the particles by the fractionation multiple to get the content of the substance in the suspension. Based on this content and the mass of the experimental soil, calculate the percentage of soil particles of the corresponding particle size.

5. The analysis method of a sedimentation soil particle analyzer according to claim 4, characterized in that: During stirring in step 1, the stirring speed is 25-35 times / minute, the stirring time is 1-1.5 minutes, and the stirring amplitude of the stirring rod is 30 cm, from 1 cm below the liquid surface to the bottom of the sedimentation tube.

6. The analysis method of a sedimentation soil particle analyzer according to claim 4, characterized in that: In step 2, the volume of liquid aspirated is 20 ml. When the volume of liquid aspirated exceeds 20 ml, the liquid is stored in the liquid storage bubble, and the middle piston is rotated to be discharged back into the sedimentation cylinder through the lower opening of the liquid return pipe.

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