Soil-matrix-parent rock combined leaching test device

Abstract

The application discloses a soil-mother material-mother rock combined leaching test device, which comprises soil column units, mother material column units and mother rock column units connected in sequence from top to bottom; the lower end of the outer side wall of each column unit is provided with a scale mark, and a bearing filter plate is clamped at the lower position in the interior of each column unit; nylon gauze and quartz sand layers are laid on each bearing filter plate; the interior of the mother material column units and the mother rock column units is clamped with water distribution filter plates; the bottom end of the soil column units and the mother material column units is provided with a first water valve, and the lower end of the outer side wall of the mother rock column units is provided with a second water valve; the application reserves cavities in the bottom of the soil column units, the mother material column units and the mother rock column units, and sets scale marks on the outer wall of each column unit, so that each column unit can be individually quantified after leaching, and the total amount of heavy metal release in different matrix layers can be analyzed by measuring the heavy metal concentration of the leaching solution.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of testing or analyzing material technology, in particular to a soil-matrix-parent rock combined leaching test device. BACKGROUND

[0002] Studies have shown that plants can release heavy metals in soil through root activity, and the vertical migration of heavy metals in the stratum presents significant interlayer differentiation characteristics, which is controlled by the synergistic effect of the physical structure, geochemical properties and biological action of each matrix layer. Therefore, it is urgent to find out the release effect of plants on heavy metals in soil and the migration change rule of heavy metals in different depth matrix layers in high geological background area, and it is a common research method to build a leaching test device in the laboratory.

[0003] However, the leaching test device for studying the migration of heavy metals has the following defects: 1. Only part of the leaching solution can be extracted through the side wall openings of different heights to measure the concentration of pollutants such as heavy metals, and the total amount of heavy metal migration in each layer of matrix cannot be quantitatively analyzed; 2. A large amount of preferential flow may be generated due to the dramatic change of the medium properties at the interface of the matrix layer in a single column, affecting the leaching effect; 3. It is not convenient to sample each layer of matrix after leaching, and cross contamination may occur during sampling.

[0004] Therefore, there is an urgent need for a test device that can not only plant plants but also quantitatively analyze the release and migration of heavy metals between matrix layers. SUMMARY

[0005] In view of the above technical problems, the present application provides a soil-matrix-parent rock combined leaching test device.

[0006] The technical scheme of the present application is as follows: a soil-matrix-parent rock combined leaching test device, comprising a soil column unit, a matrix column unit connected to the bottom end of the soil column unit, and a parent rock column unit connected to the bottom end of the matrix column unit; the soil column unit, the matrix column unit and the parent rock column unit are all cylindrical structures with open top ends and closed bottom ends, and are all made of PET material; the outer side wall of the soil column unit, the matrix column unit and the parent rock column unit is provided with a scale mark at the lower end, the bottom end of the soil column unit and the matrix column unit is provided with a first water valve, and the lower position inside the soil column unit, the matrix column unit and the parent rock column unit is movably connected with a load-bearing filter plate through an arc-shaped limiting strip, and the upper end face of each load-bearing filter plate is sequentially laid with a nylon gauze layer and a quartz sand layer;

[0007] The quartz sand layer above the corresponding position inside the matrix column unit and the parent rock column unit is movably connected with a water distribution filter plate through an arc-shaped limiting strip, and the water distribution filter plate and the load-bearing filter plate are the same in structure;

[0008] The second water valve is arranged at the lower end of the outer side wall of the parent rock column body unit.

[0009] Further, the thickness of the load-bearing filter plate is 3-5 mm, the aperture diameter is 2-4 mm, the hole distance is 8-10 mm, the aperture diameter of the nylon gauze is 300-450 meshes, the thickness of the quartz sand layer is 1-1.5 cm, and the particle size of the quartz sand used in the quartz sand layer is 80-100 meshes.

[0010] Description: Through the above arrangement, the leachate of each column matrix can uniformly flow out, ensuring the representativeness of the leachate sampling.

[0011] Further, the bottom end of the soil column unit and the parent material column unit is connected with a plug-in ring; the soil column unit is movably plugged with the parent material column unit through the plug-in ring at the bottom end of the soil column unit; the parent material column unit is movably plugged with the parent rock column unit through the plug-in ring at the bottom end of the parent material column unit; the outer side wall of the plug-in ring is provided with a positioning protrusion, and the inner side wall of the parent material column unit and the parent rock column unit is provided with a positioning groove capable of movably clamping the positioning protrusion at the corresponding position;

[0012] Description: The soil column unit, the parent material column unit and the parent rock column unit are movably plugged by the plug-in ring, effectively simplifying the installation and disassembly work of the device.

[0013] Further, the arc-shaped limiting strip is wrapped with an elastic steel strip inside, and the outer side wall of the arc-shaped limiting strip is provided with a rubber anti-skid strip;

[0014] Description: By arranging an elastic steel strip inside the arc-shaped limiting strip and arranging a rubber anti-skid strip on the outer side wall of the arc-shaped limiting strip, each arc-shaped limiting strip can be in close contact with the soil column unit, the parent material column unit and the parent rock column unit, thereby ensuring the supporting effect of the arc-shaped limiting strip on the load-bearing filter plate.

[0015] Further, the inner side wall of the arc-shaped limiting strip is provided with a connecting block at both ends, and a release assembly is movably connected between the two connecting blocks; the release assembly comprises a mounting seat movably connected with the two connecting blocks, a rotating sleeve rotatably connected in the mounting seat and movably connected with the two connecting blocks, and an operating rod rotatably connected with the mounting seat and slidably connected with the rotating sleeve; the two connecting blocks are slidably connected with the mounting seat through sliding rods, and the two sides of the rotating sleeve are connected with traction guide wires corresponding to the two connecting blocks;

[0016] Description: When the height of the arc-shaped limiting strip needs to be adjusted, rotating the operating rod makes the traction guide wires wind around the rotating sleeve, at this time, the two connecting blocks slide along the mounting seat under the action of the traction guide wires and approach each other, which is conducive to improving the convenience of adjusting the arc-shaped limiting strip.

[0017] Further, a positioning disc is sleeved outside the operating lever and above the rotating sleeve; the mounting seat is internally provided with a locking ring capable of being movably connected with the positioning disc;

[0018] Description: when the arc-shaped limiting strip is separated from the inner wall of the soil column unit, the operating lever is pulled up, the positioning disc is movably connected with the locking ring, and the guide rod is always pulled to connect the block, so that the arc-shaped limiting strip can be prevented from being rubbed and stuck with the inner wall of the soil column unit during movement.

[0019] Further, the first water valve comprises a drain pipe, a gate plate slidably connected with the drain pipe, and a pushing slide rod connected with the outer side wall of the parent column unit and abutting against the left end of the gate plate; the gate plate is a rectangular thin plate structure, both ends of the gate plate penetrate through the drain pipe, the right end of the gate plate is connected with a clamping block, the clamping block is slidably connected with the outer side wall of the drain pipe through a guide rod, a reset spring is sleeved on the guide rod and abuts against the right end of the clamping block; a through hole is formed in the gate plate; a threaded seat is formed in the outer side wall of the parent column unit and is threadedly connected with the pushing slide rod;

[0020] Description: when the positioning convex is connected with the corresponding positioning groove, the pushing slide rod can abut against the end of the gate plate; when it is needed to release the leaching liquid in the bottom of the soil column unit or the parent column unit, the pushing slide rod is rotated, the pushing slide rod pushes the gate plate to move along the drain pipe under the action of the threaded seat, the through hole is communicated with the inner cavity of the drain pipe, the leaching liquid can be discharged without separating the soil column unit, the parent column unit and the parent rock column unit, and the operation convenience of the application is improved.

[0021] Further, the bottom end of the drain pipe is rotatably connected with a water distributing plate, a plurality of water falling holes are formed in the water distributing plate, a plurality of water guide strips are equidistantly distributed on the upper end surface of the water distributing plate, and a rotating tooth disc is arranged on the lower bottom surface of the water distributing plate; an active sleeve is arranged on the outer side wall of the parent column unit, and a pressing rod is arranged on the parent column unit and penetrates through the soil column unit and the active sleeve; a rack is connected with the rotating tooth disc and is connected with the pressing rod at the end close to the rotating tooth disc; a compression spring is sleeved on the pressing rod and abuts against the inner wall of the active sleeve;

[0022] Description: during the leaching liquid discharging process, the pressing rod is pushed, the water distributing plate reciprocates under the meshing action of the rack and the rotating tooth disc, the water guide strips collide with the leaching liquid and scatter the leaching liquid, the scattered leaching liquid falls through the water falling holes, and the leaching liquid in the previous level is uniformly infiltrated in the column substrate, so that the preferential flow in the leaching process is reduced.

[0023] Further, the outer side walls of the load-bearing filter plate and the water distribution filter plate are both sleeved with a sealing air bag ring, and the sealing air bag ring is provided with an inflation nozzle;

[0024] Description: By setting the sealing air bag ring, the sealing property of the connection between the load-bearing filter plate and the water distribution filter plate and each column can be improved.

[0025] Further, a plurality of sliding columns are distributed equidistantly around the upper end surface of the load-bearing filter plate, each sliding column is slidably connected with a clamping seat, and a damping spring is sleeved on each sliding column and abuts against the upper end surface of the clamping seat at the corresponding position.

[0026] Description: The nylon gauze is fixed on the upper end surface of the load-bearing filter plate by the clamping seat, so that the loss of the matrix in the column caused by the falling of the nylon gauze during the installation of the load-bearing filter plate is avoided, and the use reliability of the present application is improved.

[0027] The use method of the present application comprises the following steps:

[0028] S1, respectively, in the soil column unit, the parent material column unit and the parent rock column unit, the lower position in the inside is connected with the arc limiting strip, then the load-bearing filter plate is connected above the corresponding arc limiting strip, so that the load-bearing filter plate and the bottom of the corresponding column unit form a leachate collection cavity;

[0029] S2, the nylon gauze is laid on the upper end surface of each load-bearing filter plate, and the quartz sand layer is laid on the upper end surface of the nylon gauze;

[0030] S3, the soil in the geological high background area is taken, sieved and filled in the soil column unit, and then the related research plants are planted in the soil column unit;

[0031] S4, the heavy metal geological high background area rock weathering product (i.e. parent material) is taken, ground and filled in the parent material column unit, and the water distribution filter plate is connected in the parent material column unit and above the rock weathering product through the arc limiting strip;

[0032] S5, the heavy metal geological high background area rock (i.e. parent rock) is taken, ground and filled in the parent rock column unit, and the water distribution filter plate is connected in the parent rock column unit and above the rock through the arc limiting strip;

[0033] S6, the soil column unit, the parent material column unit and the parent rock column unit are sequentially inserted from top to bottom, then the first leaching is carried out using sufficient leaching solution, so that the matrix in each column unit is completely penetrated, and the natural state is restored after standing;

[0034] S7, based on the local precipitation data, according to the specific test requirements and test targets, the leaching amount of each time is determined, then the leaching solution is added from the soil column unit, and the first water valve and the second water valve are kept closed, when the leaching solution in the bottom of the soil column unit no longer rises, the leachate volume is determined according to the scale mark;

[0035] S8, open the first water valve at the bottom end of the soil column unit, take a small amount of leachate sample for testing, and allow the remaining leachate to infiltrate naturally to the parent material column unit, and the leachate sampling method of the parent material column unit and the parent rock column unit is consistent with that of the soil column unit;

[0036] S9, determine the heavy metal concentration in the leachate sample of each column internal matrix, and calculate the total amount of heavy metals released or adsorbed by each level of matrix according to the reading of the corresponding scale mark.

[0037] Compared with the prior art, the beneficial effects of the present application are reflected in the following aspects:

[0038] First, the structure of the present application is reasonable, by reserving a cavity in the bottom of the soil column unit, the parent material column unit and the parent rock column unit, and setting a scale mark on the outer wall of each column unit, so that after the column unit is leached, the leachate volume of each column unit can be individually quantified, and by determining the heavy metal concentration of the leachate, the total amount of heavy metals released in different matrix layers can be analyzed;

[0039] Second, by setting a water distribution filter plate in the parent material column unit and the parent rock column unit, and setting a water distribution plate below the first water valve, the pre-sequence leaching solution can be uniformly infiltrated in the column matrix, avoiding preferential flow, which is beneficial to improve the accuracy of the test results;

[0040] Third, after leaching, different matrix layer samples can be individually collected according to actual needs, avoiding cross contamination between different matrices caused by traditional destructive soil column sampling. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a longitudinal sectional view of the device of the present application;

[0042] Figure 2 is a structural schematic view of the parent material column unit;

[0043] Figure 3 is a connection schematic view of the soil column unit and the parent material column unit;

[0044] Figure 4 is Figure 3 is a local enlarged schematic view of A in the parent material column unit;

[0045] Figure 5 is a structural schematic view of the first water valve;

[0046] Figure 6 is a connection schematic view of the arc-shaped limiting strip and the soil column unit;

[0047] Figure 7 is a connection schematic view of the plug-in ring and the parent material column unit;

[0048] Figure 8is the structural diagram of the load-bearing filter plate;

[0049] Figure 9 is the structural diagram of the release assembly;

[0050] Figure 10 is the connection diagram of the positioning disc and the locking ring;

[0051] Figure 11 is the distribution diagram of the water guide strip on the water distribution plate;

[0052] Figure 12 is the connection diagram of the rack and the rotating toothed disc;

[0053] Figure 13 is the connection diagram of the clamping seat and the sliding column;

[0054] Among them, 1-soil column unit, 10-scale mark, 11-first water valve, 110-drainage pipe, 111-shutter, 1110-conducting hole, 1111-detent block, 112-pushing slide rod, 113-guide rod, 1130-return spring, 114-threaded seat, 12-arc-shaped limiting strip, 120-elastic steel strip, 121-rubber non-slip strip, 122-connection block, 1220-sliding rod, 13-load-bearing filter plate, 14-nylon gauze, 15-plug-in ring, 150-positioning protrusion, 151-positioning groove, 2-parent material column unit, 20-water distribution filter plate, 3-parent rock column unit, 30-second water valve, 4-release assembly, 40-mounting seat, 400-locking ring, 41-rotating sleeve, 42-operation rod, 420-positioning disc, 43-pulling guide wire, 5-water distribution plate, 50-falling water hole, 51-water guide strip, 52-rotating toothed disc, 53-movable sleeve, 54-pressing rod, 540-compression spring, 55-rack, 6-sealing air bag ring, 60-inflation nozzle, 7-sliding column, 70-clamping seat, 71-damping spring. DETAILED DESCRIPTION

[0055] Example 1: as Figure 1 , Figure 2The illustrated soil-mother material-mother rock combined leaching test device comprises a soil column unit 1, a mother material column unit 2 connected to the bottom end of the soil column unit 1, and a mother rock column unit 3 connected to the bottom end of the mother material column unit 2; the soil column unit 1, the mother material column unit 2, and the mother rock column unit 3 are all cylindrical structures with open upper ends and closed bottom ends, and are all made of PET material; the lower ends of the outer sidewalls of the soil column unit 1, the mother material column unit 2, and the mother rock column unit 3 are all provided with scale markings 10, the bottom ends of the soil column unit 1 and the mother material column unit 2 are provided with first water valves 11 (commercial products), and the lower inner positions of the soil column unit 1, the mother material column unit 2, and the mother rock column unit 3 are all movably clamped with load-bearing filter plates 13 through arc-shaped limiting strips 12, and the upper end faces of the load-bearing filter plates 13 are all sequentially laid with nylon gauze 14 and a quartz sand layer;

[0056] As shown in Figure 2 , the quartz sand layer above the corresponding positions in the inner parts of the mother material column unit 2 and the mother rock column unit 3 are all movably clamped with water distribution filter plates 20 through arc-shaped limiting strips 12, and the water distribution filter plates 20 and the load-bearing filter plates 13 are of the same structure;

[0057] As shown in Figure 1 , the lower end of the outer sidewall of the mother rock column unit 3 is provided with a second water valve 30 (commercial product).

[0058] Example 2: The difference between this example and Example 1 is that the thickness of the load-bearing filter plate 13 is 5 mm, the opening diameter is 4 mm, and the hole distance is 8 mm; the mesh size of the nylon gauze 14 is 450, the thickness of the quartz sand layer is 1.5 cm, and the particle size of the quartz sand used in the quartz sand layer is 100.

[0059] Example 3: The difference between this example and Example 2 is that, as shown in Figure 2 , Figure 7 , the bottom ends of the soil column unit 1 and the mother material column unit 2 are both connected with plug-in rings 15; the soil column unit 1 is movably plugged with the plug-in ring 15 at the bottom end thereof into the upper opening of the mother material column unit 2; the mother material column unit 2 is movably plugged with the plug-in ring 15 at the bottom end thereof into the upper opening of the mother rock column unit 3; the outer sidewall of the plug-in ring 15 is provided with a positioning protrusion 150, and the inner sidewalls of the mother material column unit 2 and the mother rock column unit 3 at the upper ends thereof are both provided with positioning grooves 151 that can movably clamp the positioning protrusion 150 at the corresponding positions.

[0060] Example 4: The difference between this example and Example 3 is that, as shown in Figure 6As shown, the arc-shaped limiting strip 12 is wrapped with an elastic steel strip 120 inside, and a rubber anti-skid strip 121 is arranged on the outer side wall of the arc-shaped limiting strip 12.

[0061] Embodiment 5: The difference between this embodiment and embodiment 4 is that, as shown in Figure 6 、 Figure 9 、 Figure 10 As shown, the inner side wall of the arc-shaped limiting strip 12 is provided with a connecting block 122 at each end, and a release assembly 4 is movably connected between the two connecting blocks 122; the release assembly 4 comprises a mounting seat 40 movably connected with the two connecting blocks 122, a rotating sleeve 41 rotatably connected inside the mounting seat 40 and movably connected with the two connecting blocks 122 respectively, and an operating lever 42 rotatably connected on the mounting seat 40 and slidably connected with the rotating sleeve 41; the two connecting blocks 122 are slidably connected with the mounting seat 40 through sliding rods 1220 respectively, and the rotating sleeve 41 is connected with traction wires 43 corresponding to the two connecting blocks 122 respectively on both sides; a positioning disc 420 is sleeved outside the operating lever 42 and above the rotating sleeve 41; the mounting seat 40 is provided with a locking ring 400 movably connected with the positioning disc 420.

[0062] Embodiment 6: The difference between this embodiment and embodiment 5 is that, as shown in Figure 3 、 Figure 4 、 Figure 5 As shown, the first water valve 11 comprises a drain pipe 110, a gate plate 111 slidably connected on the drain pipe 110, and a push sliding rod 112 connected on the outer side wall of the parent column body unit 2 at the upper end and abutting against the left end of the gate plate 111; the gate plate 111 is a rectangular thin plate structure, and both ends of the gate plate 111 penetrate through the drain pipe 110, and the right end of the gate plate 111 is connected with a clamping block 1111 which is slidably connected with the outer side wall of the drain pipe 110 through a guide rod 113, and a return spring 1130 is sleeved on the guide rod 113 and abuts against the right end of the clamping block 1111; a through hole 1110 is arranged on the gate plate 111; a threaded seat 114 is arranged on the outer side wall of the parent column body unit 2 and is threadedly connected with the push sliding rod 112.

[0063] Embodiment 7: The difference between this embodiment and embodiment 6 is that, as shown in Figure 4 、 Figure 11 、 Figure 12As shown, the bottom end of the drain pipe 110 is rotationally connected with a water uniformizing plate 5, a plurality of water falling holes 50 are arranged through the water uniformizing plate 5, 8 water guide strips 51 are equidistantly arranged on the upper end surface of the water uniformizing plate 5, and a rotating toothed disc 52 is arranged on the lower bottom surface of the water uniformizing plate 5; an activity sleeve 53 is arranged on the outer side wall of the parent material column unit 2, two press rods 54 are arranged on the parent material column unit 2 and respectively penetrate the soil column unit 1 and the activity sleeve 53, and a rack 55 connected with the rotating toothed disc 52 is arranged on the end of the press rod 54 close to the rotating toothed disc 52; a compression spring 540 abutting against the inner wall of the activity sleeve 53 is arranged on the press rod 54.

[0064] Embodiment 8: The difference between this embodiment and embodiment 7 is that, as shown in the figure, Figure 8 As shown, the outer side walls of the load-bearing filter plate 13 and the water distribution filter plate 20 are respectively sleeved with a sealed air bag ring 6, and the sealed air bag ring 6 is provided with an air inlet 60.

[0065] Embodiment 9: The difference between this embodiment and embodiment 8 is that, as shown in the figure, Figure 8 , Figure 13 As shown, 6 sliding columns 7 are equidistantly arranged on the upper end surface of the load-bearing filter plate 13, a clamping seat 70 is slidingly connected to each sliding column 7, and a damping spring 71 abutting against the upper end surface of the clamping seat 70 at the corresponding position is sleeved on each sliding column 7.

[0066] Embodiment 10: The use method of the dissolution test device of embodiment 9 is described, which comprises the following steps:

[0067] S1, respectively, in the soil column unit 1, the parent material column unit 2 and the parent rock column unit 3 inside the lower position clamping arc limiting strip 12, then clamping the load-bearing filter plate 13 above the corresponding arc limiting strip 12, so that the load-bearing filter plate 13 and the inner bottom of the corresponding column unit form a leachate collection cavity;

[0068] S2, lay nylon gauze 14 on the upper end surface of each load-bearing filter plate 13, and lay a quartz sand layer on the upper end surface of the nylon gauze 14;

[0069] S3, take about 1.5 kg of soil from a geological high background area, pass through a 10-mesh sieve, and then fill it into the soil column unit 1, and then plant rye grass in the soil column unit 1;

[0070] S4, take 100g of rock weathering product (i.e. parent material) from a heavy metal geological high background area, grind it to 10 mesh, and then fill it into the parent material column unit 2, and then clamp the water distribution filter plate 20 in the parent material column unit 2 above the rock weathering product through the arc limiting strip 12;

[0071] S5, take 200g of heavy metal geological high background area rock (i.e. parent rock), grind to 10 mesh, fill in the parent rock column unit 3, and clamp the water distribution filter plate 20 through the arc limiting strip 12 above the rock in the parent rock column unit 3;

[0072] S6, the soil column unit 1, the parent material column unit 2 and the parent rock column unit 3 are sequentially inserted from top to bottom, then a sufficient amount of leaching solution is used for the first leaching, the internal matrix of each column unit is completely penetrated, and is placed for 1 week until it returns to the natural state;

[0073] S7, based on the local precipitation data, according to the specific test requirements and test targets, the amount of leaching each time is determined, then the leaching solution is added from the soil column unit 1, and the first water valve 11 and the second water valve 30 are kept closed, when the bottom leaching solution in the soil column unit 1 no longer rises, the leaching liquid volume is determined according to the scale mark 10;

[0074] S8, the first water valve 11 at the bottom end of the soil column unit 1 is opened, a small amount of leaching liquid sample is taken for measurement, and the remaining leaching liquid is naturally infiltrated to the parent material column unit 2, and the leaching liquid sampling method of the parent material column unit 2 and the parent rock column unit 3 is consistent with that of the soil column unit 1;

[0075] S9, the heavy metal concentration in the leaching liquid sample of the internal matrix of each column is determined, and the total amount of heavy metals released or adsorbed by each level of matrix is calculated according to the reading of the corresponding scale mark 10.

Claims

1. A soil-parent material-parent rock combined leaching test device, characterized in that: The invention comprises a soil column unit (1), a parent material column unit (2) connected to the bottom end of the soil column unit (1), and a parent rock column unit (3) connected to the bottom end of the parent material column unit (2); the soil column unit (1), the parent material column unit (2), and the parent rock column unit (3) are all cylindrical structures with an open top and a closed bottom, and the soil column unit (1), the parent material column unit (2), and the parent rock column unit (3) are all made of PET material; ... The lower ends of the outer walls of the soil column unit (2) and the parent rock column unit (3) are both provided with scale marks (10), the bottom ends of the soil column unit (1) and the parent rock column unit (2) are both provided with first water valves (11), the lower positions of the soil column unit (1), the parent rock column unit (2) and the parent rock column unit (3) are all movably connected with load-bearing filter plates (13) through arc-shaped limit strips (12), and the upper end surfaces of the respective load-bearing filter plates (13) are sequentially paved with nylon gauze (14) and quartz sand layers; A water distribution filter plate (20) is movably connected to the quartz sand layer located at the corresponding position inside the parent material column unit (2) and the parent rock column unit (3) via the arc-shaped limit strip (12), and the water distribution filter plate (20) and the load-bearing filter plate (13) have the same structure; A second water valve (30) is provided at the lower end of the outer side wall of the parent rock column unit (3); The arc-shaped limiting strip (12) is internally wrapped with an elastic steel strip (120), and the outer side wall of the arc-shaped limiting strip (12) is provided with a rubber anti-slip strip (121); Both ends of the inner side wall of the arc-shaped limit strip (12) are provided with connecting blocks (122), and a release assembly (4) is movably connected between the two connecting blocks (122); the release assembly (4) comprises a mounting seat (40) movably connected to the two connecting blocks (122) at the same time, a rotating sleeve (41) rotatably connected to the inside of the mounting seat (40) and movably connected to the two connecting blocks (122) respectively, and an operating rod (42) rotatably connected to the mounting seat (40) and slidably connected to the rotating sleeve (41); the two connecting blocks (122) are slidably connected to the mounting seat (40) respectively through the sliding rod (1220), and the two sides of the rotating sleeve (41) are respectively connected with a traction guide wire (43) connected to the two connecting blocks (122) in a one-to-one correspondence; The first water valve (11) comprises a drainage pipe (110), a gate plate (111) slidably engaged with the drainage pipe (110), and a push slide rod (112) engaged with the upper end of the outer wall of the parent column unit (2) and abutting against the left end of the gate plate (111); the gate plate (111) is a rectangular thin plate structure, and both ends of the gate plate (111) pass through the drainage pipe (110); a clamping block (1111) is connected to the right end of the gate plate (1111), and the clamping block (1111) is slidably engaged with the outer wall of the drainage pipe (110) through a guide rod (113); a return spring (1130) is sleeved on the guide rod (113) and abuts against the right end of the clamping block (1111); a conducting hole (1110) is penetrated through the gate plate (111); and a threaded seat (114) threadedly connected to the push slide rod (112) is provided on the outer wall of the parent column unit (2).

2. A soil-parent material-parent rock combined leaching test device according to claim 1, characterized in that: The thickness of the load-bearing filter plate (13) is 3-5 mm, the aperture of the opening is 2-4 mm, and the hole spacing is 8-10 mm; the aperture of the nylon gauze (14) is 300-450 mesh, the thickness of the quartz sand layer is 1-1.5 cm, and the particle size of the quartz sand used in the quartz sand layer is 80-100 mesh.

3. The soil-parent material-parent rock combined leaching test device according to claim 1, characterized in that: The bottom ends of the soil column unit (1) and the parent material column unit (2) are both connected with a plug-in ring (15); the soil column unit (1) is movably plugged into the upper opening of the parent material column unit (2) through the plug-in ring (15) at its bottom end; the parent material column unit (2) is movably plugged into the upper opening of the parent rock column unit (3) through the plug-in ring (15) at its bottom end; a positioning protrusion (150) is provided on the outer wall of the plug-in ring (15), and the upper ends of the inner walls of the parent material column unit (2) and the parent rock column unit (3) are both provided with a positioning groove (151) that can be movably engaged with the positioning protrusion (150) at a corresponding position.

4. The soil-parent material-parent rock combined leaching test device according to claim 1, characterized in that: A positioning disk (420) is sleeved on the outside of the operating rod (42) and located above the rotating sleeve (41); and a locking ring (400) capable of movably engaging with the positioning disk (420) is provided inside the mounting seat (40).

5. The soil-parent material-parent rock combined leaching test device according to claim 4, characterized in that: The bottom end of the drainage pipe (110) is rotatably connected to a water distribution plate (5), and the water distribution plate (5) is provided with a plurality of water holes (50) extending therethrough. The upper end surface of the water distribution plate (5) is provided with a plurality of water guide strips (51) equidistantly distributed thereon, and the lower bottom surface of the water distribution plate (5) is provided with a rotating toothed disc (52); a movable sleeve (53) is provided on the outer wall of the parent material column unit (2), and a pressing rod (54) is provided on the parent material column unit (2), with two ends respectively penetrating the soil column unit (1) and the movable sleeve (53); the pressing rod (54) is connected to a rack (55) meshing with the rotating toothed disc (52) at one end close to the rotating toothed disc (52); and a compression spring (540) is provided on the pressing rod (54) and abuts against the inner wall of the movable sleeve (53).

6. The soil-parent material-parent rock combined leaching test device according to claim 1, characterized in that: The outer side walls of the load-bearing filter plate (13) and the water distribution filter plate (20) are both sleeved with a sealing airbag ring (6), and the sealing airbag ring (6) is provided with an inflation nozzle (60).

7. The soil-parent material-parent rock combined leaching test device according to claim 1, characterized in that: A plurality of sliding columns (7) are equidistantly distributed circumferentially on the upper end surface of the load-bearing filter plate (13), each of the sliding columns (7) is slidably engaged with a clamping seat (70), and each of the sliding columns (7) is sleeved with a damping spring (71) that abuts against the upper end surface of the clamping seat (70) at a corresponding position.

Images