Filling body heavy metal leaching test device and method under multi-field coupling effect

Abstract

The invention relates to a filling body weight metal leaching test device under a multi-field coupling effect, which comprises a water bath box, a solution injection pipe, soaking containers, a test block, a filter screen, a liquid collecting bottle, a peristaltic pump and a driving circuit, the soaking containers are uniformly distributed in the water bath box, and the top and the bottom of each soaking container are respectively provided with a flow guide port; the top of each soaking container is communicated with the solution injection pipe through a diversion port, the bottom of each soaking container is communicated with the liquid collecting bottle through a diversion port, a test block and a filter screen are arranged in each soaking container, the driving circuit is connected with the outer side surface of the water bath box, and the water bath box, the soaking containers and the peristaltic pump are electrically connected. The using method comprises the three steps of equipment assembling, solution immersing and leachate collecting. On one hand, the requirements of efficient, convenient and batch test operation can be effectively met; and on the other hand, the interference of human factors on the test result in the test process is effectively reduced, so that the detection precision of the test operation is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a filling body heavy metal leaching test device and method under the action of multiple fields, belonging to the technical field of leaching liquid detection. BACKGROUND

[0002] At present, the experimental methods for heavy metal leaching are not uniform at home and abroad. In China, there are many standards for the toxicity leaching of solidified bodies of solid waste. They are mainly divided into three categories: rapid leaching experiment, long-term semi-dynamic leaching experiment and column leaching method. However, in actual work, it is found that the current traditional experimental equipment and test process are manually operated, and the test variables in the test process are very different from the underground environment. The research process of heavy metal element leaching rule of filling body is not only time-consuming and laborious, but also the experimental precision is limited, and it is also difficult to effectively meet the needs of batch test operation. And in the experimental process, it is often difficult to effectively simulate the complex external environmental factors in actual operation, so the current experimental equipment and method is difficult to effectively meet the needs of work.

[0003] In view of this problem, it is urgent to develop a new heavy metal leaching test device and monitoring method to meet the needs of actual work. SUMMARY

[0004] In order to solve the problems in the prior art, the present application provides a filling body heavy metal leaching test device and method under the action of multiple fields. The present application is integrated, modularized and highly automated. On the one hand, it can effectively meet the needs of efficient, convenient and batch test operation, and meet the needs of leaching experiment of various types of raw materials, greatly improving the versatility and flexibility of the experimental device. On the other hand, it effectively reduces the interference of human factors on the test results in the test process, effectively stabilizes the environmental factors, human factors, equipment factors and other variables in the experimental process, thereby effectively improving the detection precision of the test operation and the efficiency and precision of the research process of heavy metal element leaching rule of filling body.

[0005] In order to achieve the above purpose, the present application is realized by the following technical scheme: The application discloses a filling body heavy metal leaching test device under multi-field coupling effect, which comprises a water bath box, a solution injection pipe, soaking containers, test blocks, filter screens, liquid collecting bottles, peristaltic pumps and a driving circuit.

[0006] Further, the number of the liquid collecting bottles is consistent with that of the soaking containers, and each soaking container is communicated with one liquid collecting bottle; meanwhile, the liquid collecting bottles are connected with the water bath box and are located below the soaking containers.

[0007] Further, the water bath box comprises a bearing keel, a water bath tank, electric heating wires, temperature sensors, a sealing cover, positioning clamps and heat exchangers, wherein the bearing keel is a groove frame structure with a horizontal cross section in the shape of "H"; the water bath tank is a groove structure with a horizontal cross section in the shape of "N", is connected with the sealing cover and forms a closed cavity structure; at least one water bath tank is embedded in the groove on the upper end surface of the bearing keel; the water bath tank and the groove on the bottom of the bearing keel are provided with a plurality of positioning clamps; the soaking containers are located in the water bath tank and are connected with the inner side of the water bath tank through the positioning clamps; a plurality of liquid collecting bottles are located in the groove on the bottom of the bearing keel and are connected with the side wall of the bearing keel through the positioning clamps; the positioning clamps are slidably connected with the water bath tank and the bearing keel through sliding grooves; at least one electric heating wire is embedded in the groove bottom of the bearing keel; at least one temperature sensor is arranged in the groove on the upper half and the lower half of the bearing keel; the electric heating wires and the temperature sensors are electrically connected with the driving circuit; at least two heat exchangers are arranged in the water bath tank and are symmetrically distributed along the axis of the water bath tank; and the heat exchangers are embedded in the side wall of the water bath tank.

[0008] Further, control valves and flow sensors are arranged at the flow guide openings, and the control valves and the flow sensors are electrically connected with the driving circuit; the solution injection pipe is in a shunt arrangement structure, and the solution injection pipe is connected with the top of the water bath box.

[0009] Further, the soaking container comprises a bearing bottle, a pressing block, a high-pressure air bag, a pressing plate, a pressure sensor, and a pressure regulating valve. The bearing bottle is a "N" shaped cylindrical barrel structure in axial section, and a flow guide port is arranged on the bottom of the bearing bottle. The upper half of the pressing block is embedded in the upper end surface of the bearing bottle and forms a sealed cavity structure with the bearing bottle. Meanwhile, another flow guide port is arranged on the upper half of the pressing block. The upper half of the pressing block is located outside the bearing bottle, and the lower half is located inside the bearing bottle. The lower end surface of the pressing block is connected with the pressing plate through the high-pressure air bag. The high-pressure air bag and the pressing plate are arranged in a closed loop annular structure which is not coaxial with the bearing bottle. The lower end surface of the pressing plate abuts against the upper end surface of the test block. Meanwhile, the high-pressure air bag and the pressing block are connected with each other through at least two pressure sensors which are evenly distributed around the axis. A pressure regulating valve is arranged at the flow guide port of the bottom of the bearing bottle and is connected with the flow guide pipe through the pressure regulating valve. The pressure sensor and the pressure regulating valve are electrically connected with the driving circuit.

[0010] Further, the area of the filter screen is at least 3 times the area of the flow guide port. The filter screen comprises a high polymer filter screen, a high polymer clamp, a high polymer bearing spring, an elastic sealing ring, and an elastic pad. The high polymer filter screen has two layers and is arranged along the axis of the bearing bottle from top to bottom. The outer surface of the lower high polymer filter screen is connected with the high polymer clamp, and the high polymer clamp abuts against the inner surface and the bottom of the bearing bottle through the high polymer clamp. The high polymer clamp is arranged in a closed loop annular structure which is coaxial with the bearing bottle. The cross section of the high polymer clamp is in the shape of an "L" type groove. The upper end surface of the high polymer clamp is connected with at least three high polymer bearing springs which are evenly distributed around the axis of the bearing bottle. The high polymer bearing springs are connected with the lower end surface of the upper high polymer filter screen through the high polymer bearing springs. The distance between the two high polymer filter screens is not less than 1 cm. The lower end surface of the upper high polymer filter screen is provided with at least four elastic pads which are evenly distributed around the axis. The thickness of the elastic pads is 1 / 4-2 / 3 of the maximum distance between the two high polymer filter screens.

[0011] Further, the test block is a cylindrical structure in axial section, and a flow slowing cavity is arranged on the upper end surface of the test block. The flow slowing cavity is a conical cavity structure. The diameter of the upper end surface of the flow slowing cavity is 1.2-2 times the diameter of the flow guide port. The diameter of the bottom of the flow slowing cavity is 60%-80% of the diameter of the test block, and the height is not more than 10% of the height of the test block.

[0012] Further, the driving circuit is a circuit system based on an FPGA chip. The driving circuit is provided with any one or several of the following common devices: a display, a keyboard, a button, and a potentiometer. A method for using a device for filling body heavy metal leaching test under the action of multiple fields, comprising the following steps: S1, device assembly, firstly, the bath box, solution injection pipe, soaking container, test block, filter screen, liquid collection bottle, peristaltic pump and drive circuit are assembled to obtain finished product experimental device, then on one hand, each soaking container is filled with test block and filter screen, and the filled soaking container is placed and positioned in the water bath box, and meanwhile each positioned soaking container is communicated with solution injection pipe and liquid collection bottle; on the other hand, deionized water is injected into the water bath in the water bath box, the heat exchanger of the water bath is communicated with the external heat source mechanism, the solution injection pipe is communicated with the external test liquid supply system, finally, the bath box is driven to run for temperature rising operation, and inert gas is injected into each solution injection pipe, soaking container and liquid collection bottle and pressure is maintained during the temperature rising process; S2, solution immersion, after the completion of S1 step, the solution to be detected is injected into each soaking container through the peristaltic pump in the solution injection pipe, and the solution level, temperature and pressure in each soaking container are set and kept constant, and the solution is continuously placed for a preset time according to the experimental process requirements; S3, leaching solution collection, after S2 step, the soaking container is communicated with the liquid collection bottle, so that the solution in the soaking container is driven by the self-gravity and the experimental pressure in the soaking container to converge into the corresponding liquid collection bottle, and after the liquid collection bottle collects enough leaching solution discharged from the soaking container, the liquid collection bottle is removed and transferred to the subsequent time device.

[0013] Compared with the prior art, the present application has high integration, modularity and automation, on one hand, can effectively meet the needs of efficient, convenient and batch test operation, and meet the needs of leaching experiments of various different types of raw materials, greatly improve the experimental general-purpose and use flexibility; on the other hand, effectively reduces the interference of human factors on the test results in the test process, effectively stabilizes the environmental factors, human factors, equipment factors and other variables in the experimental process, thereby effectively improves the detection accuracy of the test operation, and effectively improves the efficiency and precision of the research process of the heavy metal element leaching rule of the filling body. BRIEF DESCRIPTION OF DRAWINGS

[0014] The present application will be described in detail below with reference to the drawings and specific embodiments; Figure 1 The present application is a system structure schematic diagram; Figure 2 The present application is a soaking container cross-sectional local structure schematic diagram; Figure 3 The present application is a filter screen cross-sectional local structure schematic diagram; Figure 4 The present application is a method flowchart schematic diagram. DETAILED DESCRIPTION

[0015] In order to make the technical means, creative features, purposes and effects of the present application easy to construct, the present application will be further described below with reference to the specific embodiments.

[0016] As Figures 1-3 shown, a filling body heavy metal leaching test device under the action of multiple field coupling includes a water bath box 1, a solution injection pipe 2, a soaking container 3, a test block 4, a filter screen 5, a liquid collection bottle 6, a peristaltic pump 7 and a driving circuit 8, wherein the water bath box 1 is a closed cavity structure with a rectangular cross section, the soaking containers 3 are evenly distributed in the water bath box 1, and the axes of the soaking containers 3 are vertically distributed with the horizontal plane, a flow guide port 9 is arranged at the top and bottom of each soaking container 3, the top of each soaking container 3 is communicated with the solution injection pipe 2 through the flow guide port 9, the bottom of each soaking container 3 is communicated with a flow guide pipe through the flow guide port 9, and the flow guide pipe is communicated with a liquid collection bottle 6, the flow guide port 9 is communicated with the solution injection pipe 2 and the flow guide pipe through the peristaltic pump 7, the soaking container 3 is provided with the test block 4 and the filter screen 5, wherein the filter screen 5 is located below the test block 4 and abuts against the bottom of the soaking container 3, the driving circuit 8 is connected with the outer side of the water bath box 1, and the water bath box 1, the soaking containers 3 and the peristaltic pump 7 are electrically connected.

[0017] In the embodiment, the number of the liquid collection bottles 6 is consistent with the number of the soaking containers 3, each soaking container 3 is communicated with a liquid collection bottle 6, and the liquid collection bottles 6 are connected with the water bath box 1 and located below the soaking containers 3.

[0018] The water bath box 1 includes a bearing keel 101, a water bath tank 102, an electric heating wire 103, a temperature sensor 104, a sealing cover 105, a positioning clamp 106 and a heat exchanger 107, wherein the bearing keel 101 is a groove frame structure with an “H”-shaped cross section, the water bath tank 102 is a “N”-shaped groove structure with a cross section, is connected with the sealing cover 105 and forms a closed cavity structure, at least one water bath tank 102 is embedded in the groove on the upper end surface of the bearing keel 101, a plurality of positioning clamps 106 are arranged in the water bath tank 102 and the groove on the bottom of the bearing keel 101, the soaking containers 3 are located in the water bath tank 102 and connected with the inner side of the water bath tank 102 through the positioning clamps 106, a plurality of liquid collection bottles 6 are located in the groove on the bottom of the bearing keel 101 and connected with the side wall of the bearing keel 101 through the positioning clamps 106, the positioning clamps 106 are slidably connected with the water bath tank 102 and the bearing keel 101 through a sliding groove 108, at least one electric heating wire 103 is embedded in the groove bottom of the bearing keel 101, at least one temperature sensor 104 is arranged in the upper half and the lower half of the groove of the bearing keel 101, the electric heating wire 103 and the temperature sensor 104 are electrically connected with the driving circuit 8, and at least two heat exchangers 107 are arranged in the water bath tank 102 and symmetrically distributed with their axes, and the heat exchangers 107 are embedded in the side wall of the water bath tank 102.

[0019] The electric heating wire is arranged to effectively adjust the working environment temperature of the water bath tank of the bearing keel machine; the heat exchanger is arranged to adjust the temperature of the liquid for temperature adjustment in the water bath tank, so as to achieve the purpose of constant temperature test operation of the immersion container and the test block in the immersion container. Thus, the experimental environment is stable, and the experimental precision is reduced due to the temperature change.

[0020] In the embodiment, the control valve 10 and the flow sensor 11 are arranged at the flow guide port 9, and each control valve 10 and flow sensor 11 is electrically connected with the driving circuit 8; the solution injection pipe 2 is a shunt structure, and the solution injection pipe 2 is connected with the top of the water bath box 1.

[0021] It is emphasized that the immersion container 3 includes a bearing bottle 31, a pressing block 32, a high-pressure air bag 33, a pressing plate 34, a pressure sensor 35, and a pressure regulating valve 36. The bearing bottle 31 is a "N" shaped cylindrical barrel structure in axial section, and a flow guide port 9 is arranged at the bottom of the bearing bottle 31. The upper half of the pressing block 32 is embedded in the upper end surface of the bearing bottle 31 and forms a sealed cavity structure with the bearing bottle 31. Meanwhile, another flow guide port 9 is arranged on the pressing block 32 and coaxially distributed with the bearing bottle 31. The upper half of the pressing block 32 is located outside the bearing bottle 31, and the lower half is located inside the bearing bottle 31. The lower end surface of the pressing block 32 is connected with the pressing plate 34 through the high-pressure air bag 33. The high-pressure air bag 33 and the pressing plate 34 are not coaxially distributed with the closed loop ring structure of the bearing bottle 31. The lower end surface of the pressing plate 34 abuts against the upper end surface of the test block 4. Meanwhile, the high-pressure air bag 33 and the pressing block 32 are connected with each other through at least two pressure sensors 35 which are evenly distributed around the axis. Another pressure regulating valve 36 is arranged at the flow guide port 9 of the bottom of the bearing bottle 31 and is connected with the flow guide pipe through the pressure regulating valve 36. The pressure sensor 35 and the pressure regulating valve 36 are electrically connected with the driving circuit 8.

[0022] During operation, the high-pressure air bag is connected with an external high-pressure gas source. High-pressure gas is injected into the high-pressure air bag to increase the volume of the high-pressure air bag and the pressure of the high-pressure air bag, thereby driving the pressing plate to move downward and apply pressure to the test block, so as to adjust the test pressure. The pressure sensor can accurately detect the test pressure, and the pressure regulating valve can discharge the leaching liquid in the bearing bottle after pressure regulation.

[0023] In addition, the filter screen 5 area is at least 3 times the area of the flow guide 9, including a high polymer filter screen 51, a high polymer clamp 52, a high polymer bearing spring 53, an elastic sealing ring 54, and an elastic pad 55. The high polymer filter screen 51 has two layers and is distributed from top to bottom along the axis of the bearing bottle 31 and is coaxial with the bearing bottle 31. The outer side of the lower high polymer filter screen 51 is connected with the high polymer clamp 52, and the high polymer clamp 52 is connected with the inner side and bottom of the bearing bottle 31. The high polymer clamp 52 is a closed ring structure coaxial with the bearing bottle 31, and the cross section is an "L" type slot structure. The upper end surface of the high polymer clamp 52 is connected with at least three high polymer bearing springs 53 evenly distributed around the axis of the bearing bottle 31, and the high polymer bearing spring 53 is connected with the lower end surface of the upper high polymer filter screen 51. The distance between the two high polymer filter screens 51 is not less than 1 cm. In addition, the lower end surface of the upper high polymer filter screen 51 is provided with at least four elastic pads 55 evenly distributed around the axis, and the thickness of the elastic pad 55 is 1 / 4-2 / 3 of the maximum distance between the two high polymer filter screens 51.

[0024] The structure of the two high polymer filter screens connected by the high polymer bearing spring can effectively improve the bearing capacity and pressure resistance of the filter screen, thereby preventing damage to the filter screen caused by experimental pressure.

[0025] It should be noted that the test block 4 is a cylindrical structure with a rectangular axial cross section. An upper end surface of the test block 4 is provided with a buffer chamber 12 coaxially distributed. The buffer chamber 12 is a conical chamber structure. The upper end surface has a diameter of 1.2-2 times the diameter of the flow guide 9. The bottom diameter is 60%-80% of the diameter of the test block 4, and the height is not more than 10% of the height of the test block 4.

[0026] The buffer chamber can store the seepage liquid used for the experiment and make the seepage liquid seep into the test block at a constant speed, thereby improving the experimental efficiency and accuracy.

[0027] In this embodiment, the driving circuit 8 is a circuit system based on an FPGA chip, and the driving circuit is provided with any one or several of a display, a keyboard, a button, and a potentiometer.

[0028] As shown in Figure 4 A method for using a filling body heavy metal leaching test device under the action of multiple field coupling, comprising the following steps: S1, device assembly, firstly, the bath box, solution injection pipe, soaking container, test block, filter screen, liquid collection bottle, peristaltic pump and drive circuit are assembled to obtain the finished experimental device, then on the one hand, each soaking container is filled with test block, filter screen, and the filled soaking container is placed and positioned in the water bath box, and the positioned soaking container is communicated with the solution injection pipe and the liquid collection bottle; on the other hand, deionized water is injected into the water bath in the water bath box, and the heat exchanger of the water bath is communicated with the external heat source mechanism, the solution injection pipe is communicated with the external test liquid supply system, finally, the bath box is driven to run for temperature rising operation, and inert gas is injected into each solution injection pipe, soaking container and liquid collection bottle and pressure is maintained during temperature rising; S2, solution immersion, after S1 step, the solution to be detected is injected into each soaking container through the peristaltic pump in the solution injection pipe, and the solution level, temperature and pressure in each soaking container are set and kept constant, and the experimental process requires continuous standing to the preset time; S3, leaching solution collection, after S2 step, the soaking container is communicated with the liquid collection bottle, so that the solution in the soaking container is driven by the self-gravity and the experimental pressure in the soaking container to converge into the corresponding liquid collection bottle, and after the liquid collection bottle collects enough leaching solution discharged from the soaking container, the liquid collection bottle is removed and transferred to the subsequent time equipment.

[0029] Compared with the prior art, the application has high integration, modularity and automation, on the one hand, can effectively meet the needs of efficient, convenient and batch test operation, and meet the needs of leaching experiments of various different types of raw materials, greatly improve the experimental generalization and use flexibility; on the other hand, effectively reduces the interference of human factors on the test results in the test process, effectively stabilizes the environmental factors, human factors, equipment factors and other variables in the experimental process, thereby effectively improves the detection accuracy of the test operation, and effectively improves the efficiency and precision of the research process of the heavy metal element leaching rule of the filling body.

[0030] The basic principles and main features of the application and the advantages of the application are shown and described above. It should be understood by those skilled in the art that the application is not limited by the above examples, the above examples and descriptions in the specification are only to illustrate the principles of the application, without departing from the spirit and scope of the application, the application can have various changes and improvements, and these changes and improvements all fall within the scope of the claimed application. The scope of protection of the application is defined by the appended claims and their equivalents.

Claims

1. A device for heavy metal leaching test of a filling under multi-field coupling, characterized by, The filling body heavy metal leaching test device under the multi-field coupling effect comprises a water bath box, a solution injection pipe, soaking containers, test blocks, filter screens, liquid collecting bottles, peristaltic pumps and a driving circuit, wherein the water bath box is a closed cavity structure with a rectangular cross section, the soaking containers are evenly distributed in the water bath box, and the axes of the soaking containers are vertically distributed with the horizontal plane, each of the soaking containers is provided with a flow guide opening at the top and the bottom, the top of each of the soaking containers is communicated with the solution injection pipe through the flow guide opening, the bottom of each of the soaking containers is communicated with a flow guide pipe through the flow guide opening, and the flow guide pipe is communicated with a liquid collecting bottle, the flow guide openings are communicated with the solution injection pipe and the flow guide pipe through the peristaltic pump, the soaking containers are provided with the test blocks and the filter screens, the filter screens are located below the test blocks and abut against the bottoms of the soaking containers, and the driving circuit is connected with the outer side of the water bath box and is electrically connected with the water bath box, the soaking containers and the peristaltic pumps.

2. The device for heavy metal leaching test of filling body under multi-field coupling according to claim 1, characterized in that, The number of the liquid collecting bottles is consistent with that of the soaking containers, each of the soaking containers is communicated with a liquid collecting bottle, and the liquid collecting bottles are connected with the water bath box and located below the soaking containers.

3. The device according to claim 1, wherein The water bath box comprises a bearing keel, a water bath tank, electric heating wires, temperature sensors, a sealing cover, positioning clamps and heat exchangers, wherein the bearing keel is a groove frame structure with an "H" shaped cross section, the water bath tank is a "N" shaped groove structure with a cross section, is connected with the sealing cover and forms a closed cavity structure, at least one water bath tank is embedded in the groove on the upper end surface of the bearing keel, the water bath tank and the groove at the bottom of the bearing keel are provided with a plurality of positioning clamps, the soaking containers are located in the water bath tank and connected with the inner side of the water bath tank through the positioning clamps, a plurality of liquid collecting bottles are located in the groove at the bottom of the bearing keel and connected with the side wall of the bearing keel through the positioning clamps, the positioning clamps are slidably connected with the water bath tank and the bearing keel through the sliding grooves, at least one electric heating wire is embedded in the groove bottom of the bearing keel, at least one temperature sensor is arranged in the groove of the upper half and the lower half of the bearing keel, the electric heating wires and the temperature sensors are electrically connected with the driving circuit, at least two heat exchangers are arranged in the water bath tank and symmetrically distributed along the axis of the water bath tank, and the heat exchangers are embedded in the side wall of the water bath tank.

4. The device according to claim 1, wherein Control valves and flow sensors are arranged at the flow guide openings, and the control valves and the flow sensors are electrically connected with the driving circuit, the solution injection pipe is a shunt structure, and the solution injection pipe is connected with the top of the water bath box.

5. The device according to claim 1, wherein The soaking container comprises a bearing bottle, a pressing block, a high-pressure air bag, a pressing plate, a pressure sensor and a pressure regulating valve. The bearing bottle is a "N" shaped cylindrical barrel structure in axial section. A flow guide opening coaxial with the bearing bottle is arranged at the bottom of the bearing bottle. The upper half of the pressing block is embedded in the upper end surface of the bearing bottle and forms a sealed cavity structure with the bearing bottle. Another flow guide opening coaxial with the bearing bottle is arranged on the upper half of the pressing block. The upper half of the pressing block is located outside the bearing bottle, and the lower half is located inside the bearing bottle. The lower end surface of the pressing block is connected with the pressing plate through the high-pressure air bag. The high-pressure air bag and the pressing plate are not coaxial with the closed loop annular structure of the bearing bottle. The lower end surface of the pressing plate abuts against the upper end surface of the test block. The high-pressure air bag and the pressing block are connected with each other through at least two pressure sensors which are evenly distributed around the axis. A pressure regulating valve is arranged at the flow guide opening at the bottom of the bearing bottle and is connected with the flow guide pipe through the pressure regulating valve. The pressure sensor and the pressure regulating valve are electrically connected with the driving circuit.

6. The device according to claim 1, wherein The filter screen area is at least 3 times the area of the flow guide opening. The filter screen comprises a high polymer filter screen, a high polymer clamp, a high polymer bearing spring, an elastic sealing ring and an elastic pad. The high polymer filter screen has two layers and is distributed along the axis of the bearing bottle from top to bottom. The outer surface of the lower high polymer filter screen is connected with the high polymer clamp, and the high polymer clamp abuts against the inner surface and the bottom of the bearing bottle through the high polymer clamp. The high polymer clamp is a closed loop annular structure coaxial with the bearing bottle, and the transverse section is an "L" shaped groove structure. The upper end surface of the high polymer clamp is connected with at least three high polymer bearing springs which are evenly distributed around the axis of the bearing bottle, and the high polymer bearing springs are connected with the lower end surface of the upper high polymer filter screen through the high polymer bearing springs. The distance between the two high polymer filter screens is not less than 1 cm. The lower end surface of the upper high polymer filter screen is provided with at least four elastic pads which are evenly distributed around the axis, and the thickness of the elastic pads is 1 / 4-2 / 3 of the maximum distance between the two high polymer filter screens.

7. The device according to claim 1, wherein The test block is a rectangular cylindrical structure in axial section. A flow slowing cavity coaxial with the test block is arranged at the upper end surface of the test block. The flow slowing cavity is a conical cavity structure. The diameter of the upper end surface of the flow slowing cavity is 1.2-2 times the diameter of the flow guide opening. The diameter of the bottom of the flow slowing cavity is 60%-80% of the diameter of the test block, and the height is not more than 10% of the height of the test block.

8. The device according to claim 1, wherein The driving circuit is a circuit system based on an FPGA chip. The driving circuit is provided with any one or several of the following common devices: a display, a keyboard, a button and a potentiometer.

9. A method of using the device for filling body heavy metal leaching test under multi-field coupling according to claim 1, characterized in that, The use method of the gangue multi-field coupling filling heavy metal leaching test device comprises the following steps: S1, device assembly, firstly, the bath box, solution injection pipe, immersion container, test block, filter screen, liquid collection bottle, peristaltic pump and drive circuit are assembled to obtain the finished experimental device, then on the one hand, each immersion container is filled with test block and filter screen, and the filled immersion container is placed and positioned in the water bath box, and each immersion container is communicated with the solution injection pipe and the liquid collection bottle after positioning; on the other hand, deionized water is injected into the water bath in the water bath box, and the heat exchanger of the water bath is communicated with the external heat source mechanism, the solution injection pipe is communicated with the external test liquid supply system, finally the water bath is driven to run for temperature rising operation, and inert gas is injected into each solution injection pipe, immersion container and liquid collection bottle and pressure is maintained during temperature rising; S2, solution immersion, after completing S1 step, the solution to be detected is injected into each immersion container through the peristaltic pump in the solution injection pipe, and the solution level, temperature and pressure in each immersion container are set and kept constant, and the solution is continuously placed for a predetermined time according to the experimental process requirements; S3, leaching solution collection, after S2 step, the immersion container is communicated with the liquid collection bottle, so that the solution in the immersion container is driven by its own gravity and the experimental pressure in the immersion container to flow into the corresponding liquid collection bottle, and after the liquid collection bottle collects enough leaching solution discharged from the immersion container, the liquid collection bottle is removed and transferred to the subsequent time equipment.

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