Soil mechanical composition analysis pipetting device

Abstract

The utility model discloses a soil mechanical composition analysis pipetting device. The device comprises a bracket; a lifting seat is mounted on the lifting device; the liquid suction pipe is fixed on the lifting seat; one end of the peristaltic pump is communicated with the upper end of the liquid suction pipe; a water inlet of the water inlet pump is connected with a water source, and a water outlet of the water inlet pump is communicated with the upper end of the liquid suction pipe. The peristaltic pump rotates reversely, liquid in the liquid suction pipe is discharged into the sample cylinder, the water inlet pump pumps water into the liquid suction pipe in the discharging process, the liquid suction pipe is cleaned at the same time, and soil residues in the liquid suction pipe are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of soil mechanical composition analysis, and in particular relates to a soil mechanical composition analysis liquid transfer device. Background Art

[0002] Soil is composed of different-sized soil particles in different proportions. The coarseness and fineness of the soil when these different-sized soil particles are mixed together is called the mechanical composition of the soil. The mechanical composition of the soil determines the soil's ability to retain fertilizer and water and its permeability, and has important practical significance for the evaluation of the basic properties of the soil and the formation environment. The determination of the mechanical composition of the soil is based on Stoke's law, the principle of which is: after a certain amount of soil sample is dispersed and washed, all particles with a particle size of less than 0.25 mm are transferred to a measuring cylinder to make a suspension, and the suspension in the measuring cylinder is fixed to 1000 ml. The suspension is placed in a sedimentation cylinder. After the suspension is fully stirred in the sedimentation cylinder, the soil particles in the suspension settle at a uniform speed under the action of gravity. The sedimentation speed of the soil particles is proportional to the square of the radius of the soil particles. The larger the soil particles, the faster the sedimentation speed. In this way, the particle amount of soil particles of different particle sizes can be measured.

[0003] Technicians need to sample soil suspension at a specific depth at specific intervals. The disadvantage of this operation is that technicians need to set an alarm next to each soil suspension container, be ready for sampling operations at any time, and arrange shifts. Therefore, the traditional method of determining soil mechanical composition is very inefficient and is not suitable for large-scale detection tasks.

[0004] The patent with publication number CN117214411A discloses a soil mechanical composition tester and a liquid suction control system. The technician puts the sedimentation barrel with stirring into the tester. After checking the sample number, he presses the start button, and the output end of the second drive motor rotates, thereby driving the synchronous transmission belt to rotate. The synchronous transmission belt first moves downward and reaches the specified depth. The negative pressure generator works, causing the negative pressure ventilation pipe to generate negative pressure. Since the negative pressure ventilation pipe and the pipette are connected, the pipette starts to absorb liquid. After the liquid absorption is completed, the transmission end drives the pipette to move upward and return to the initial height. At the same time, the second drive motor works, driving the pipette to rotate above the sample tube. At this time, the negative pressure generator acts in the opposite direction to transfer the soil suspension in the pipette into the sample tube.

[0005] However, the above device does not have the function of cleaning the pipette, and soil will remain on the inner wall of the pipette, which will affect the analysis results. Utility Model Content

[0006] The utility model aims to provide a soil mechanical composition analysis liquid transfer device, which can clean the soil in a liquid pipette.

[0007] To achieve the above purpose, the utility model provides the following technical solution: a soil mechanical composition analysis liquid transfer device, comprising:

[0008] Bracket;

[0009] A lifting device, wherein a lifting seat is installed on the lifting device;

[0010] A pipette, the pipette being fixed on the lifting seat;

[0011] a peristaltic pump, one end of which is connected to the upper end of the pipette;

[0012] A water inlet pump, wherein the water inlet of the water inlet pump is connected to a water source, and the water outlet of the water inlet pump is connected to the upper end of the liquid suction pipe;

[0013] A moving device is provided with a sample cylinder, and the moving device moves the sample cylinder to below the pipette.

[0014] Furthermore, it also includes a solenoid valve, which is arranged between the upper end of the suction tube and the water inlet pump.

[0015] Furthermore, the peristaltic pump includes a negative pressure state and an air outlet state.

[0016] Furthermore, the moving device comprises a rotating cylinder, the rotating cylinder is fixed on the bracket, a placing rack is fixed on the rotating shaft of the rotating cylinder, the placing rack is provided with two placing grooves, and sample cylinders are placed in the two placing grooves.

[0017] Furthermore, a placement platform is provided on the bracket, and the accommodating cylinder is placed on the placement platform.

[0018] Furthermore, the lifting device comprises:

[0019] A lifting base, with support bases fixed at both ends of the lifting base;

[0020] A rotating screw rod, the rotating screw rod being rotatably connected between the two supporting seats;

[0021] A lifting screw block, the lifting screw block being threadedly connected to the rotating screw rod;

[0022] A guide rail, the guide rail is fixed on the lifting base, a slider is installed on the guide rail, and the slider is fixedly connected to the lifting screw block;

[0023] A driving motor is fixed on the supporting seat, and a rotating shaft of the driving motor is fixedly connected to the rotating screw.

[0024] Furthermore, a liquid level sensor is fixed on the pipette.

[0025] Furthermore, the solenoid valve includes a cleaning state, and in the cleaning state, the solenoid valve is cycled on and off.

[0026] Furthermore, the moving device comprises a pushing cylinder, the pushing cylinder is fixed on the bracket, a pushing frame is fixed on the piston rod of the pushing cylinder, a pushing groove is provided on the pushing frame, and the sample tube is placed on the pushing groove.

[0027] Furthermore, a pushing guide rail is fixed on the bracket, a pushing slider is installed on the pushing guide rail, and the pushing slider is fixed to the pushing frame.

[0028] Compared with the prior art, the beneficial effects of the utility model are:

[0029] (1) The peristaltic pump rotates in the opposite direction to discharge the liquid in the pipette into the sample tube. During the discharge process, the water inlet pump draws water into the pipette and cleans the pipette at the same time to avoid soil residue in the pipette.

[0030] (2) After cleaning is completed, the peristaltic pump continues to discharge air, making the inner wall of the pipette dry faster;

[0031] (3) By setting up two sample tubes, it can receive twice;

[0032] (4) The pulse form can better clean the soil in the suction tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of an embodiment of a soil mechanical composition analysis pipetting device;

[0034] Figure 2 for Figure 1 A cross-sectional view of

[0035] Figure 3 for Figure 2 A partial enlarged view of point I in the middle;

[0036] Figure 4 It is a schematic diagram of the connection structure of the water circuit and the gas circuit;

[0037] Figure 5 It is a structural schematic diagram of the lifting device;

[0038] Figure 6 is a structural schematic diagram of another embodiment of a mobile device;

[0039] Figure 7 for Figure 6 A partial enlarged view of point II in the middle.

[0040] In the figure: 1. bracket; 2. lifting device; 3. lifting seat; 4. pipette; 5. peristaltic pump; 6. water inlet pump; 7. solenoid valve; 8. rotating cylinder; 9. placement rack; 10. placement slot; 11. sample tube; 12. placement platform; 13. lifting base; 14. support seat; 15. rotating screw; 16. lifting screw block; 17. guide rail; 18. slider; 19. driving motor; 20. liquid level sensor; 21. containing tube; 22. pushing cylinder; 23. pushing rack; 24. pushing slot; 25. pushing guide rail; 26. pushing slider. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] See also Figure 1-Figure 7 The utility model provides a technical solution for a soil mechanical composition analysis liquid transfer device.

[0043] A soil mechanical composition analysis pipetting device, comprising:

[0044] Bracket 1;

[0045] A lifting device 2, on which a lifting seat 3 is installed;

[0046] A pipette 4, which is fixed on the lifting seat 3;

[0047] A peristaltic pump 5, one end of which is connected to the upper end of the pipette 4;

[0048] A water inlet pump 6 , wherein the water inlet of the water inlet pump 6 is connected to a water source, and the water outlet of the water inlet pump 6 is communicated with the upper end of the liquid suction pipe 4 .

[0049] When the lifting device 2 is used to drive the pipette 4 to be inserted into the receiving tube 21, the peristaltic pump 5 is started to generate negative pressure in the pipette 4, thereby sucking out the liquid in the receiving tube 21. Then the lifting device 2 moves the pipette 4 out of the receiving tube 21. Then the peristaltic pump 5 rotates in the opposite direction to discharge the liquid in the pipette 4 into the sample tube 11. During the discharge process, the water inlet pump 6 draws water into the pipette 4 and cleans the pipette 4 at the same time to avoid soil residue in the pipette 4.

[0050] The liquid transfer device further comprises an electromagnetic valve 7, which is arranged between the upper end of the liquid pipette 4 and the water inlet pump 6. The liquid inlet into the liquid pipette 4 is controlled by controlling the on-off of the electromagnetic valve 7.

[0051] The peristaltic pump 5 includes a negative pressure state and a gas outlet state. The peristaltic pump 5 can be switched between the negative pressure state and the gas outlet state by controlling the forward and reverse rotation. The negative pressure state extracts the liquid, and the gas outlet state can speed up the liquid discharge, and continue to exhaust gas after cleaning is completed, so that the inner wall of the liquid pipette 4 dries faster.

[0052] The liquid transfer device further comprises a rotating cylinder 8 , which is fixed on the bracket 1 . A placement rack 9 is fixed on the rotating shaft of the rotating cylinder 8 . The placement rack 9 is provided with two placement slots 10 . Sample cylinders 11 are placed in the two placement slots 10 .

[0053] In this way, two sample cylinders 11 can be used to receive the sucked liquid. The pipette 4 sucks the liquid in the sample cylinder 11, and then the lifting device 2 moves the pipette 4 out of the sample cylinder 11. Then the rotating cylinder 8 drives the corresponding sample cylinder 11 to rotate under the pipette 4, and then the pipette 4 discharges the liquid into the corresponding sample cylinder 11. By setting up two sample cylinders 11, liquid sucked twice can be received.

[0054] A placement platform 12 is provided on the bracket 1 , and the accommodating tube 21 is placed on the placement platform 12 .

[0055] The following is an implementation of the lifting device 2. Figure 5 As shown, the lifting device 2 includes:

[0056] A lifting base 13, with support bases 14 fixed at both ends of the lifting base 13;

[0057] Rotate the screw 15, and rotate the screw 15 to connect between the two support seats 14;

[0058] A lifting screw block 16, the lifting screw block 16 is threadedly connected to the rotating screw rod 15, and the lifting seat 3 is fixed on the lifting screw block 16;

[0059] A guide rail 17, the guide rail 17 is fixed on the lifting base 13, a slider 18 is installed on the guide rail 17, and the slider 18 is fixedly connected to the lifting screw block 16;

[0060] The driving motor 19 is fixed on the supporting base 14 , and the rotating shaft of the driving motor 19 is fixedly connected to the rotating screw 15 .

[0061] The driving motor 19 drives the rotating screw 15, and the rotating screw 15 drives the lifting screw block 16 to move up and down, thereby driving the pipette 4 to move up and down.

[0062] In order to detect the liquid level in the pipette 4, a liquid level sensor 20 is fixed on the pipette 4. When the liquid level in the pipette 4 reaches a set position, the liquid level sensor 20 receives a signal and the pipette 4 stops pipetting liquid.

[0063] The solenoid valve 7 includes a cleaning state. In the cleaning state, the solenoid valve 7 is cycled on and off. Since the solenoid valve 7 is cycled on and off, the water that comes out is in the form of pulses. The pulse form can better clean the soil in the suction tube 4.

[0064] The following is a schematic diagram of the structure of another embodiment of the mobile device. Figure 6 and Figure 7 As shown, the moving device includes a pushing cylinder 22 , which is fixed on the bracket 1 , a pushing frame 23 is fixed on the piston rod of the pushing cylinder 22 , a pushing groove 24 is provided on the pushing frame 23 , and the sample tube 11 is placed on the pushing groove 24 .

[0065] The pipette 4 sucks the liquid out of the sample tube 11 , and then the lifting device 2 moves the pipette 4 out of the sample tube 11 , and then pushes the cylinder 22 to drive the corresponding sample tube 11 to rotate under the pipette 4 , and then the pipette 4 discharges the liquid into the corresponding sample tube 11 .

[0066] In order to make the pushing frame 23 move more smoothly, a pushing guide rail 25 is fixed to the bracket 1 , and a pushing slider 26 is installed on the pushing guide rail 25 , and the pushing slider 26 is fixed to the pushing frame 23 .

[0067] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A soil mechanical composition analysis pipetting device, characterized in that: include: Bracket; A lifting device, wherein a lifting seat is installed on the lifting device; A pipette, the pipette being fixed on the lifting seat; a peristaltic pump, one end of which is connected to the upper end of the pipette; A water inlet pump, wherein the water inlet of the water inlet pump is connected to a water source, and the water outlet of the water inlet pump is connected to the upper end of the liquid suction pipe; A moving device is provided with a sample cylinder, and the moving device moves the sample cylinder to below the pipette.

2. A soil mechanical composition analysis pipetting device according to claim 1, characterized in that: It also includes a solenoid valve, which is arranged between the upper end of the suction pipe and the water inlet pump.

3. A soil mechanical composition analysis pipetting device according to claim 1, characterized in that: The peristaltic pump includes a negative pressure state and an air outlet state.

4. A soil mechanical composition analysis pipetting device according to claim 1, characterized in that: The moving device comprises a rotating cylinder, which is fixed on the bracket. A placing frame is fixed on the rotating shaft of the rotating cylinder. The placing frame is provided with two placing grooves, and sample tubes are placed in the two placing grooves.

5. A soil mechanical composition analysis pipetting device according to claim 1, characterized in that: The bracket is provided with a placement platform, and the accommodating tube is placed on the placement platform.

6. A soil mechanical composition analysis pipetting device according to claim 1, characterized in that: The lifting device comprises: A lifting base, with support bases fixed at both ends of the lifting base; A rotating screw rod, the rotating screw rod being rotatably connected between the two supporting seats; A lifting screw block, the lifting screw block being threadedly connected to the rotating screw rod; A guide rail, the guide rail is fixed on the lifting base, a slider is installed on the guide rail, and the slider is fixedly connected to the lifting screw block; A driving motor is fixed on the supporting seat, and a rotating shaft of the driving motor is fixedly connected to the rotating screw.

7. A soil mechanical composition analysis pipetting device according to claim 1, characterized in that: A liquid level sensor is fixed on the liquid pipette.

8. A soil mechanical composition analysis pipetting device according to claim 2, characterized in that: The solenoid valve includes a cleaning state, and in the cleaning state, the solenoid valve is cycled on and off.

9. The soil mechanical composition analysis pipetting device according to claim 1, characterized in that: The moving device comprises a pushing cylinder, the pushing cylinder is fixed on the bracket, a pushing frame is fixed on the piston rod of the pushing cylinder, a pushing groove is provided on the pushing frame, and the sample cylinder is placed on the pushing groove.

10. A soil mechanical composition analysis pipetting device according to claim 9, characterized in that: A pushing guide rail is also fixed on the bracket, a pushing slider is installed on the pushing guide rail, and the pushing slider is fixed to the pushing frame.

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