An integrated phosphogypsum-based specimen dry-wet cycle and leachate monitoring system

Abstract

The present invention relates to an integrated wet-dry cycle and leachate monitoring system for phosphogypsum-based specimens. The system comprises a test chamber with a dry zone and a wet zone, with a controllable transfer port between the dry and wet zones. A wet-dry cycle test assembly comprises a transfer base, a transfer drive unit for driving the transfer base, and a spring plate mounted on the transfer base and capable of vertical movement. The phosphogypsum-based specimen to be tested is placed on the spring plate. The transfer drive unit is provided with a switch trigger plate, and a trigger member is provided below the spring plate. The trigger member has upper and lower trigger points with conductive functions. Compared with the prior art, the present invention utilizes the mass difference of the specimen during the dry and wet cycles, and based on a quality threshold, uses the trigger member to achieve automated wet-dry cycling without the addition of complex control devices and equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of phosphogypsum-based roadbed material performance testing, and relates to an integrated phosphogypsum-based specimen dry-wet cycle and leachate monitoring system. Background Art

[0002] Phosphogypsum is an industrial byproduct typically derived from the wet-process phosphoric acid production process. Due to its chemical composition and physical properties, using phosphogypsum as a building material is an effective means of disposing of this byproduct. Road subgrade construction typically requires large volumes of filler, and using phosphogypsum as a roadbed filler is one of the most effective ways to achieve large-scale, resource-efficient disposal. However, phosphogypsum-based roadbed fillers are subject to various environmental conditions in practical applications, with wet-dry cycles being a key factor affecting their durability and stability.

[0003] In order to verify the mechanical properties and pollutant leaching characteristics of phosphogypsum-based roadbed materials under dry-wet cycling conditions, and then explore their long-term service performance and environmental safety in a water-rich environment, it is necessary to design an experimental device that can simulate a natural dry-wet cycle environment.

[0004] However, although the existing dry-wet cycle test equipment can meet research needs to a certain extent, there are still some problems and limitations in practical applications: First, the specimen is difficult to move, and switching between the dry area and the wet area is usually achieved through manual handling. The switching process is cumbersome, which affects the efficiency of the dry-wet cycle. At the same time, due to the introduction of human factors, it is easy to cause mass loss of the specimen during the movement process; second, it is impossible to directly monitor the volume and mass changes of the specimen; third, it is impossible to monitor the pH value and heavy metal ions of the leachate.

[0005] Chinese patent application CN201910242425.6 discloses a dry-wet cycle simulation test device for concrete tidal zone and splash zone, including a liquid storage tank, a test box, a connecting pipe, a liquid storage tank vent, a test box vent, a ceiling fan, a steel pipe, a steel frame, an upper water level sensor, a lower water level sensor, a temperature and humidity sensor, a temperature sensor, a box support, a connecting valve, a pipe rack, an inlet pump, an inlet valve, an outlet pipe, an outlet pump, an outlet valve, a spray pipe, a spray head and a control box. The control box can control and record the test parameters in real time to achieve a clear boundary between the tidal zone and the splash zone. During the test, the tidal zone is always in an immersion environment and the splash zone is in a spraying environment.

[0006] Although the patent envisions the basic principle of dry-wet cycling, it has the following defects: (1) The patent lacks direct monitoring of the volume and mass changes of the specimen during the dry-wet cycling process, and cannot obtain relevant data of the leachate in real time. The monitoring data requires the specimen to be disassembled during the cycle, which can easily cause damage to the specimen and affect the accuracy of the data. (2) The patent lacks precise control of the wet environment, which affects the repeatability and reliability of the experimental results. (3) The dry-wet cycle of the patent is completed at the same spatial scale, which may cause mutual interference between the dry and wet areas during the switching process, affecting the experimental results. At the same time, existing devices generally rely on simple air flow equipment such as ceiling fans for drying, which makes it difficult to achieve a truly effective dry cycle and cannot guarantee the constancy and consistency of the dry-wet cycle. Summary of the Invention

[0007] The purpose of the present invention is to provide an integrated phosphogypsum-based specimen wet-dry cycle and leachate monitoring system to improve the wet-dry cycle efficiency, etc., so as to solve at least one of the above-mentioned problems.

[0008] The purpose of the present invention can be achieved by the following technical solutions:

[0009] An integrated phosphogypsum-based specimen wet-dry cycle and leachate monitoring system, comprising:

[0010] The test chamber has a dry area and a wet area therein, with a transfer port that can be controlled to open and close between the dry area and the wet area, the dry area is used to dehumidify the phosphogypsum-based specimens, and the wet area is used to humidify the phosphogypsum-based specimens;

[0011] The dry-wet cycle test assembly includes a transfer base plate capable of moving back and forth between the dry area and the wet area through the transfer port, a transfer drive unit for driving the transfer base plate, and a spring plate disposed on the transfer base plate and capable of moving up and down. A phosphogypsum-based test piece as a test object is placed on the spring plate. The transfer drive unit is provided with a switch trigger piece. A trigger member that moves up and down with the spring plate is provided below the spring plate. The trigger member is provided with an upper trigger point and a lower trigger point that are respectively located above and below the switch trigger piece and have a conductive function.

[0012] The trigger member and the switch trigger piece are configured such that: when the trigger member moves upward along with the spring plate until the lower trigger point contacts the switch trigger piece, the transfer drive unit is positively activated to drive the transfer base plate to move from the dry area to the wet area;

[0013] When the trigger member moves downward along with the spring plate until the upper trigger point contacts the switch trigger piece, the transfer drive unit is reversely activated to drive the transfer base plate to move from the wet area to the dry area.

[0014] Furthermore, a guide rod passing through the transfer base plate in a vertical direction is provided at the end corner position of the spring plate, and a spring member is sleeved on the guide rod. The lower end of the spring member is connected to the bottom end of the guide rod, and the upper end abuts the transfer base plate.

[0015] Furthermore, the transfer drive unit includes a double-headed motor installed under the transfer base plate, two drive gears drivingly connected to the two output shafts of the double-headed motor, and two side-by-side guide racks passing through the transfer port and respectively meshing with the two drive gears are provided between the drying area and the wet area.

[0016] The switch trigger piece is provided at the end of the double-headed motor, and the switch trigger piece includes an upper switch trigger piece located below the upper trigger point and a lower switch trigger piece located above the lower trigger point.

[0017] Furthermore, an upper insulating spacer sheet is provided on the side wall of the drying area and can extend between the upper trigger point in the contact state and the upper switch trigger sheet;

[0018] A lower insulating spacer sheet is provided on the side wall of the wet area and can extend into between the lower trigger point in the contact state and the lower switch trigger sheet.

[0019] Furthermore, the trigger member includes a trigger frame connected to the spring plate base and passing through the transfer base plate, and the trigger frame is provided with two trigger rods arranged symmetrically in an upper and lower manner, and the upper trigger point and the lower trigger point are respectively provided on the two trigger rods. Specifically, the trigger rod is preferably L-shaped.

[0020] Furthermore, the drying area is provided with a temperature-controllable electric heating tube and a convection air hole is provided on the top;

[0021] A humidification spray head connected to an external water pipe is provided above the wet zone, and a flow controller is provided on the external water pipe;

[0022] The drying zone and the wet zone are respectively provided with infrared measuring devices capable of monitoring the volume change of the phosphogypsum-based specimen in the drying and wetting process in real time.

[0023] Furthermore, a precision weighing scale is provided on the spring plate, and a waterproof tray and a sponge pad are arranged on the precision weighing scale in sequence. The phosphogypsum-based specimen is placed on the sponge pad, and the side of the phosphogypsum-based specimen is wrapped with a rubber film, and permeable stone plates and filter paper are arranged on the upper and lower sides in sequence.

[0024] Furthermore, the wet-dry cycle test assembly also includes a pH detection probe and a mass spectrometry module, one end of which is placed on the sponge pad and the other end extends from the side of the waterproof tray.

[0025] Furthermore, a retreat cavity is provided at the top of the boundary area between the dry area and the wet area, and a partition that can move up and down and a lifting drive member connected to the partition are slidably provided in the retreat cavity. The opening area formed when the partition is lifted up and down constitutes the transfer port.

[0026] Furthermore, a sealing block is provided at the lower end of the partition.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] (1) Independently partitioned dry and wet areas are set up, and by setting transfer ports and transfer drive components, the specimens can be quickly switched between the dry and wet areas. At the same time, by utilizing the mass difference of the specimens during the dry cycle and the wet cycle, based on the quality threshold, the trigger component is used to realize the automatic dry-wet cycle without adding complex control devices and equipment. Compared with the existing manual handling and switching, the efficiency of the dry-wet cycle is greatly improved.

[0029] (2) Furthermore, by setting up a partition and a sealing tooth block in the transfer port, it is possible to facilitate switching while ensuring the sealing performance between the dry area and the wet area, avoiding the mutual influence between the two and affecting the dry-wet cycle effect.

[0030] (3) Furthermore, by setting a sponge pad at the bottom of the phosphogypsum-based specimen, a pH detection probe and a mass spectrometry module inside the sponge pad, the pH value and heavy metal ion concentration of the leachate that penetrates from the specimen into the sponge pad can be monitored during the dry-wet cycle.

[0031] (4) Furthermore, by providing a flow controller on the external pipe body of the external water pipe of the humidifying spray head, the dry-wet cycle amplitude of the wet zone can be set to different degrees to achieve the target moisture content of different wet cycle amplitudes.

[0032] (5) Furthermore, by setting up an infrared measuring device, the changes in the external volume of the test piece can be monitored in real time during the dry cycle and wet cycle.

[0033] (6) Furthermore, by setting up a precision weighing scale, the mass change of the test piece can be monitored in real time during the dry cycle and wet cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the external structure of the integrated phosphogypsum-based specimen dry-wet cycle structure and leachate monitoring system of the present invention.

[0035] Figure 2 This is a schematic diagram of the internal structure of the integrated phosphogypsum-based specimen wet-dry cycle structure and leachate monitoring system of the present invention.

[0036] Figure 3 This is a schematic diagram of the front view and cross-section structure of the integrated phosphogypsum-based specimen wet-dry cycle structure and leachate monitoring system of the present invention.

[0037] Figure 4 This is a schematic diagram of the partition structure in the integrated phosphogypsum-based specimen dry-wet cycle structure and leachate monitoring system of the present invention.

[0038] Figure 5 It is a structural schematic diagram of the transfer drive assembly and triggering component in the integrated phosphogypsum-based specimen dry-wet cycle structure and leachate monitoring system of the present invention.

[0039] Description of the marks in the figure:

[0040] 1-Test chamber; 2-Phosphogypsum-based specimen; 3-Drying area; 4-Wet area; 5-Transfer guide groove; 6-Transfer port; 7-Partition; 8-Transfer seat plate; 9-Spring plate; 10-Precision weighing scale; 11-Waterproof tray; 12-Sponge pad; 13-Permeable stone slab; 14-Filter paper; 15-Mass spectrometer module; 16-Electric heating tube; 17-Convection air hole; 18-Humidification spray head; 19-External water pipe; 20-Flow controller; 21-Infrared measuring device; 22-Double-head motor; 23-Drive gear; 24-Guide rack; 25-Motor switch trigger plate; 26-Trigger frame; 27-Trigger rod; 28-Upper insulating partition; 29-Lower insulating partition; 30-Sealing gear block; 31-Retraction cavity; 32-Lifting drive component; 33-pH detection probe. DETAILED DESCRIPTION

[0041] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0043] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0044] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0045] Furthermore, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing the embodiments of the present invention, cross-sectional views illustrating device structures may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, the three-dimensional dimensions of length, width, and depth should be included.

[0046] In order to improve the dry-wet cycle efficiency, etc. The present invention provides an integrated phosphogypsum-based specimen dry-wet cycle and leachate monitoring system, which can be found in Figures 1 to 5 Shown, including:

[0047] A test chamber 1 is provided with a dry zone 3 and a wet zone 4 therein, with a transfer port 6 being controllably opened and closed between the dry zone 3 and the wet zone 4. The dry zone 3 is used to dehumidify the phosphogypsum-based specimens, and the wet zone 4 is used to humidify the phosphogypsum-based specimens.

[0048] The dry-wet cycle test assembly includes a transfer base plate 8 that can move back and forth between the dry area 3 and the wet area 4 through the transfer port 6, a transfer drive unit that drives the transfer base plate 8, and a spring plate 9 that is arranged on the transfer base plate 8 and can move up and down. The phosphogypsum-based test piece to be tested is placed on the spring plate 9. The transfer drive unit is provided with a switch trigger piece (i.e., a motor switch trigger piece 25). A trigger member that moves up and down with the spring plate 9 is provided below the spring plate 9. The trigger member is provided with an upper trigger point and a lower trigger point that are respectively located above and below the switch trigger piece and have a conductive function.

[0049] The trigger member and the switch trigger piece are configured such that when the trigger member moves upward along with the spring plate 9 until the lower trigger point contacts the switch trigger piece, the transfer drive unit is positively activated to drive the transfer base plate 8 to move from the drying area 3 to the wet area 4;

[0050] When the trigger member moves downward with the spring plate 9 until the upper trigger point contacts the switch trigger piece, the transfer drive unit is reversely activated to drive the transfer base plate 8 to move from the wet area 4 to the dry area 3.

[0051] In the present invention, an upper trigger point, a lower trigger point, and a switch trigger piece are set as switches of the switch circuit (which can be divided into a forward switch circuit and a reverse switch circuit according to the difference in forward and reverse operation) for starting the transfer drive unit. In this way, in conjunction with the elastic restoring force of the spring plate 9 and the mass difference of the specimen during the dry-wet cycle, a suitable mass threshold is set, so that the trigger component with the upper trigger point and the lower trigger point moves downward or upward accordingly, and then the upper trigger point and the switch trigger piece (corresponding to the reverse switch circuit, the upper switch trigger piece) are in contact, or the lower trigger point and the switch trigger piece (corresponding to the forward switch circuit, the lower switch trigger piece) are in contact, thereby realizing cyclic movement in the wet area 4 and the dry area 3.

[0052] In some specific embodiments, a guide rod that passes through the transfer base plate 8 in a vertical direction is provided at the end angle position of the spring plate 9, and a spring member is sleeved on the guide rod. The lower end of the spring member is connected to the bottom end of the guide rod, and the upper end abuts the transfer base plate. Exemplarily, the spring member is a spring. By setting the spring member, the elastic force generated by the spring member cooperates with the gravity of the phosphogypsum-based specimen to reach an initial equilibrium state. As the mass of the phosphogypsum-based specimen changes during the dry-wet cycle, the spring plate 9 and the trigger component provided therewith will rise and fall accordingly, thereby realizing the power-on of the drive control circuit of the transfer drive assembly and realizing automatic dry-wet cycle switching.

[0053] In some specific embodiments, the transfer drive unit includes a double-headed motor 22 installed below the transfer base plate 8, two drive gears 23 drivingly connected to the two output shafts of the double-headed motor 22, and two side-by-side guide racks 24 passing through the transfer port 6 and respectively meshing with the two drive gears 23 are further provided between the drying area 3 and the wet area 4.

[0054] The end of the double-headed motor 22 is provided with the switch trigger piece, and the switch trigger piece includes an upper switch trigger piece located below the upper trigger point and a lower switch trigger piece located above the lower trigger point.

[0055] It should be pointed out that the double-headed motor 22 has two drive control circuits, namely the forward drive control circuit and the reverse drive control circuit. When the forward drive control circuit is connected and energized, the double-headed motor 22 rotates forward, driving the transfer seat plate 8 to move from the dry area 3 to the wet area 4. Similarly, when the reverse drive control circuit is connected and energized, the double-headed motor 22 rotates reversely, driving the transfer seat plate 8 to move from the wet area 4 to the dry area 3. Here, the switches of the forward drive control circuit are the lower trigger point and the lower switch trigger piece (when the two are in contact, the forward drive control circuit is energized; when the two are separated, the forward drive control circuit is de-energized); the switches of the reverse drive control circuit are the upper trigger point and the upper switch trigger piece (when the two are in contact, the reverse drive control circuit is energized; when the two are separated, the reverse drive control circuit is de-energized).

[0056] In a more specific embodiment, in order to correspond to the two output ends of the double-headed motor 22, two sets of trigger components are also provided on both sides of the double-headed motor 22 in a one-to-one correspondence.

[0057] In a more specific embodiment, the guide rack 24 can be arranged in the transfer guide groove 5 with its two ends located in the drying area 3 and the wet area 4 .

[0058] In a more specific embodiment, an upper insulating partition 28 is provided on the sidewall of the dry zone 3, capable of extending between the upper trigger point and the upper switch trigger piece when in contact; and a lower insulating partition 29 is provided on the sidewall of the wet zone 4, capable of extending between the lower trigger point and the lower switch trigger piece when in contact. Preferably, the bottom surface of the upper insulating partition 28 is flush with the top surface of the upper switch trigger piece, and the top surface of the lower insulating partition 29 is flush with the bottom surface of the lower switch trigger piece.

[0059] By setting the upper insulating partition sheet and the lower insulating partition sheet, the circuit can be disconnected after the transfer seat plate 8 and the like are moved to the preset areas of the wet area 4 and the dry area 3 to avoid collision due to excessive movement.

[0060] In some specific embodiments, the triggering member includes a trigger frame 26 connected to the base of the spring plate 9 and extending through the transfer base plate 8. Two trigger rods 27 are symmetrically arranged vertically on the trigger frame 26, and the upper and lower trigger points are respectively provided on the two trigger rods 27. To prevent interference or impact on other components, the trigger frame 26 is made of an insulating material, while the upper and lower trigger points are conductive and can be designed as arc-shaped structures.

[0061] In some specific embodiments, a temperature-controllable electric heating tube 16 is provided in the drying zone 3, and a convection air hole 17 is provided on the top. The electric heating tube heats the air flow introduced through the convection air hole in an adjustable temperature, thereby drying the phosphogypsum-based specimen inside.

[0062] In some specific embodiments, a humidification spray head 18 connected to an external water pipe 19 is provided above the wet zone 4. A flow controller 20 is provided on the external water pipe 19 to adjust the wet-dry cycle amplitude of the wet zone 4 to varying degrees to achieve target moisture contents for different wet cycle amplitudes. The flow controller is a commonly used control element in the art for adjusting the flow rate of the external water pipe. The specific type of flow controller is not a key innovation of the present invention and is not further described here.

[0063] In some specific embodiments, the drying zone 3 and the wetting zone 4 are each further equipped with an infrared measuring device 21 capable of real-time monitoring of the volume changes of the phosphogypsum-based specimen 2 during the drying and wetting processes. The infrared measuring device is a commonly used infrared sensor in the art, which measures the length, width, height, and other parameters of the phosphogypsum-based specimen to comprehensively calculate its volume. The specific type of infrared measuring device does not constitute a protected innovation of the present invention and is not further described here.

[0064] In some specific embodiments, a precision weighing scale 10 is mounted on the spring plate 9. A waterproof tray 11 and a sponge pad 12 are sequentially mounted on the precision weighing scale 10. The phosphogypsum-based specimen is placed on the sponge pad 12. The sides of the phosphogypsum-based specimen are wrapped with a rubber film, and a permeable stone plate 13 and filter paper 14 are sequentially mounted on the upper and lower sides, respectively. The precision weighing scale 10 enables real-time monitoring of changes in the specimen's mass during dry and wet cycles.

[0065] In a more specific embodiment, the wet-dry cycle test assembly further includes a pH detection probe 33 and a mass spectrometer module 15, one end of which is positioned within the sponge pad 12 and the other end extends from the side of the waterproof tray 11. This allows monitoring of the pH and heavy metal ion concentration of the leachate that permeates the sponge pad 12 from the specimen during the wet-dry cycle. The mass spectrometer module 15 is a conventional component module in the art capable of detecting heavy metal ion concentration in liquids and does not constitute an innovative feature of the present invention, so its further description is omitted.

[0066] In some specific embodiments, a retraction chamber 31 is provided at the top of the boundary region between the drying zone 3 and the wet zone 4. A partition 7 capable of vertical movement is slidably disposed within the retraction chamber 31, along with a lifting drive 32 connected to the partition 7. The opening formed by the vertical movement of the partition 7 constitutes the transfer port 6. The lifting drive 32 can be an electric cylinder, a lifting motor, or the like commonly used in the art. The lifting drive 32 can receive a mass threshold signal. When the mass of the phosphogypsum-based specimen in the drying zone 3 and the wet zone 4 reaches a preset threshold (at which point the transfer drive unit is triggered), the lifting drive 32 is activated to raise the partition 7, opening the transfer port 6, allowing the transfer base plate 8 and the like to be smoothly transferred between the drying zone 3 and the wet zone 4. Upon completion of a transfer (the transfer drive unit can be de-energized as the completion signal), the lifting drive 32 lowers the partition 7, thereby separating the drying zone 3 from the wet zone 4, allowing the internal environments of the two zones to be independently adjustable.

[0067] In a more specific embodiment, a sealing block is provided at the lower end of the partition 7. According to the setting of the above-mentioned guide rack 24, the sealing block can be provided with a sealing tooth block 30 that can engage with the guide rack 24. In this way, when the partition 7 is lowered into place, the sealing performance between the dry area 3 and the wet area 4 can be guaranteed to avoid mutual influence between the two and affect the dry-wet cycle effect.

[0068] The above embodiments may be implemented individually or in any combination of two or more.

[0069] The above implementation is described in more detail below with reference to specific examples.

[0070] Example 1

[0071] Reference Figure 1-Figure 5 This is the first embodiment of the present invention, providing an integrated dry-wet cycle structure for phosphogypsum-based specimens. The structure comprises a test chamber 1, a phosphogypsum-based specimen 2, and a dry zone 3 within the test chamber 1 for dehumidifying the phosphogypsum-based specimen 2 and a wet zone 4 for humidifying the phosphogypsum-based specimen 2. The dry zone 3 is located on the left side of the test chamber 1, while the wet zone 4 is located on the right side. The bottom of the test chamber 1 is provided with transfer guide grooves 5, which are horizontally arranged in a left-right direction. In this embodiment, two transfer guide grooves 5 are provided, arranged side by side front to back. These transfer guide grooves 5 traverse the dry zone 3 and the wet zone 4, facilitating the dry-wet cycle of the phosphogypsum-based specimen 2 along these transfer guide grooves. A transfer port 6 is provided between the dry zone 3 and the wet zone 4. The front-to-back dimensions of the transfer port 6 are consistent with the front-to-back inner diameter of the test chamber 1. A liftable partition 7 is provided above the transfer port 6.

[0072] The test box 1 is provided with a transfer base plate 8 inside, a spring plate 9 is provided on the transfer base plate 8, a precision weighing scale 10 is provided on the spring plate 9, a waterproof tray 11 is provided on the precision weighing scale 10, a sponge pad 12 is provided on the waterproof tray 11, the phosphogypsum-based specimen 2 is provided on the sponge pad 12, and the upper and lower sides of the phosphogypsum-based specimen 2 are sequentially provided with permeable stone plates 13 and filter paper 14, and the side is covered with a rubber film;

[0073] The bottom of the transfer seat plate 8 is provided with a transfer drive assembly that cooperates with the transfer guide groove 5, and the bottom of the spring plate 9 is provided with a trigger component that cooperates with the transfer drive assembly.

[0074] Specifically, in this embodiment, four guide rods passing through the transfer base plate 8 are provided around the bottom of the spring plate 9 , and a spring is provided between the bottom of the four guide rods and the bottom of the transfer base plate 8 .

[0075] The precision weighing scale 10 is used to monitor the mass change of the specimen during the dry-wet cycle. At the same time, this embodiment sets the mass threshold of the specimen during the wet cycle and the mass threshold of the specimen during the dry cycle in the precision weighing scale 10 respectively. The spring plate rises and falls continuously with the mass fluctuation of the specimen. When the lifting stroke reaches the threshold, the circuit of the transfer drive assembly is energized through the trigger component, thereby realizing automatic dry-wet cycle switching.

[0076] As a further improvement to this embodiment, electric heating tubes 16 are provided above and below the drying zone 3, and convection holes 17 are provided at the top. The electric heating tubes 16 have a temperature control function and can automatically adjust the temperature. The convection holes 17 can accelerate air flow and accelerate the drying of the phosphogypsum-based specimens 2. With this structure, the phosphogypsum-based specimens 2 can be dried in a cycle.

[0077] As a further improvement to this embodiment, a humidification spray head 18 is provided above the wet zone 4. The humidification spray head 18 is connected to an external water pipe 19, and a flow controller 20 is provided on the outer tube of the external water pipe 19. The humidification spray head 18 can reduce the impact of the water flow on the phosphogypsum-based specimen 2; the flow controller 20 can accurately control the humidity within the wet zone 4.

[0078] As a further improvement of this embodiment, an infrared measuring device 21 is provided in both the drying zone 3 and the wet zone 4. The infrared measuring device 21 can monitor in real time the volume change of the phosphogypsum-based specimen 2 during the dry-wet cycle.

[0079] As a further improvement of this embodiment, the transfer drive assembly includes a double-headed motor 22 provided at the bottom of the transfer base plate 8, two drive gears 23 connected to the double-headed motor 22, and two guide racks 24 provided at the bottom of the two transfer guide grooves 5. The two drive gears 23 are correspondingly engaged with the two guide racks 24. Figure 2 As shown, the double-headed motor 22 is distributed along the front-to-back direction. The double-headed motor 22 drives the driving gear 23 so that the driving gear 23 engages with the guide rack 24 for transmission, thereby realizing left-right movement along the transfer guide groove 5. Secondly, an auxiliary wheel is also provided under the transfer seat plate 8, which can play a stabilizing role and realize switching between the drying area 3 and the moistening area 4.

[0080] As a further improvement to this embodiment, the trigger component includes four motor switch trigger pieces 25 (divided into upper switch trigger pieces and lower switch trigger pieces according to their upper and lower positions) arranged at both ends of the double-headed motor 22 and located on the upper and lower sides, and two trigger frames 26 connected to the bottom of the spring plate 9 and passing through the transfer base plate 8. The two trigger frames 26 are both provided with trigger rods 27 that are symmetrically distributed up and down and correspond to the motor switch trigger pieces 25. The trigger frames 26 are made of insulating material, and the rod heads of the trigger rods 27 are arc-shaped structures, which are the upper trigger points and the lower trigger points according to their positions. The two motor switch trigger pieces 25 on the same upper and lower sides can be configured to control the forward and reverse rotation of the motor shaft corresponding to one end. The rod heads of the trigger rods 27, i.e., the upper trigger points or the lower trigger points, have a conductive function.

[0081] As a further improvement of this embodiment, two upper insulating partition plates 28 are provided on the box wall in the dry zone 3, and two lower insulating partition plates 29 are provided on the box wall in the wet zone 4. The bottom surfaces of the two upper insulating partition plates 28 are flush with the top surfaces of the two motor switch trigger plates 25 located on the upper side, and the top surfaces of the two lower insulating partition plates 29 are flush with the bottom surfaces of the two motor switch trigger plates 25 located on the lower side.

[0082] As a further improvement to this embodiment, two sealing tooth blocks 30 are provided on the lower wall of the partition 7. The two sealing tooth blocks 30 are adapted to the guide racks 24 in the transfer guide groove 5. This structure can achieve effective sealing between the dry area 3 and the wet area 4, avoiding mutual interference between the two.

[0083] As a further improvement of this embodiment, a retraction chamber 31 is provided between the drying area 3 and the wet area 4. The partition 7 is slidably mounted in the retraction chamber 31. A lifting drive member 32 connected to the partition 7 is provided in the retraction chamber 31. In this embodiment, the lifting drive member 32 is an electric cylinder.

[0084] When the present device structure is used, the phosphogypsum-based specimen 2 is placed on the sponge pad 12, and a rubber film is wrapped around the side of the phosphogypsum-based specimen 2, and a permeable stone plate 13 and a filter paper 14 are placed on the upper and lower sides; the precision weighing scale 10 resets the weight thereon at this time, and sets the mass threshold corresponding to the moisture content of the specimen during the wet cycle and the mass threshold corresponding to the moisture content of the specimen during the dry cycle, and the spring plate 9 is in the upward state; in this embodiment, the phosphogypsum-based specimen 2 is located in the wet zone 4, at this time, the upper trigger rod 27 of the trigger frame 26 is located above the upper motor switch trigger piece 25 (i.e., the upper switch trigger piece), and the lower trigger rod 27 is in contact with the lower motor switch trigger piece 25 (i.e., the lower switch trigger piece). ) are separated by a lower insulating partition 29, and the double-headed motor 22 is in a power-off state; the wet cycle begins, the flow rate of the external water pipe 19 is controlled by the flow controller 20, and distilled water drips onto the phosphogypsum-based specimen 2 through the humidification spray head 18. As the distilled water infiltrates, the weight on the precision weighing scale 10 continues to increase, and the spring plate 9 gradually descends, driving the trigger rod 27 on the upper side of the trigger component to gradually descend. When the trigger rod 27 on the upper side contacts the motor switch trigger piece 25 on the upper side, it indicates that the mass corresponding to the moisture content of the specimen during the wet cycle has been reached. Under the action of the lifting drive member 32, the partition 7 is raised in advance to open the transfer port 6, and the circuit of the double-headed motor 22 is connected, and the guide gear 23 is driven to contact the guide gear 23. The meshing rotation of the rack 24 drives the transfer seat plate 8 to transfer the phosphogypsum-based specimen 2 from the wet area 4 to the dry area 3. After the transfer is switched to the dry area 3, the upper insulating partition plate 28 in the dry area 3 is inserted between the upper trigger rod 27 and the motor switch trigger plate 25 on the upper side, disconnecting the circuit to prevent the transfer seat plate 8 from moving excessively and colliding with the left side of the test box 1; the dry cycle begins after the transfer seat plate 8 stops. As the phosphogypsum-based specimen 2 dehumidifies, the weight on the precision weighing scale 10 continues to decrease, and the spring plate 9 gradually rises, driving the trigger rod 27 on the lower side of the trigger component to gradually rise. When the trigger rod 27 on the lower side contacts the motor switch trigger plate 25 on the lower side, it indicates that the triggering condition has been reached. In order to understand the mass corresponding to the moisture content of the specimen during the dry cycle, the partition 7 is lifted up in advance under the action of the lifting drive member 32 to open the transfer port 6, and the double-headed motor 22 circuit is connected. The driving gear 23 and the guide rack 24 are engaged and rotated, and the transfer seat plate 8 drives the phosphogypsum-based specimen 2 to be transferred from the dry area 3 to the wet area 4. After the transfer is switched to the wet area 4, the lower insulating partition plate 29 located in the wet area 4 is inserted between the trigger rod 27 on the lower side and the motor switch trigger plate 25 on the lower side, so that the circuit is disconnected to prevent the transfer seat plate 8 from moving excessively and colliding with the right side of the test box 1; the above process is now a complete dry-wet cycle. In actual use, multiple dry-wet cycles can be performed according to actual working conditions.

[0085] Example 2

[0086] like Figure 2 As shown, the integrated phosphogypsum-based specimen dry-wet cycle leachate monitoring system includes the aforementioned integrated phosphogypsum-based specimen dry-wet cycle structure, as well as a pH detection probe 33, one end of which is disposed within the sponge pad 12 and the other end of which extends from the side of the waterproof tray 11, and a mass spectrometer module 15. The pH detection probe 33 and mass spectrometer module 15 can monitor the pH value and heavy metal ion concentration of the leachate that penetrates from the phosphogypsum-based specimen 2 into the sponge pad 12.

[0087] It is important to note that the configuration and arrangement of the present application, as illustrated in various exemplary embodiments, are illustrative only. Although only a few embodiments are described in detail in this disclosure, those reading this disclosure will readily appreciate that numerous modifications are possible (e.g., variations in the size, dimensions, structure, shape, and proportions of various components, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without materially departing from the novel teachings and advantages of the subject matter described herein. For example, components shown as integrally formed may be comprised of multiple parts or components, the positions of components may be inverted or otherwise altered, and the nature, number, or position of discrete components may be modified or changed. Therefore, all such modifications are intended to be encompassed within the scope of this invention. The order or sequence of any process or method steps may be altered or reordered according to alternative embodiments. Any "means-plus-function" clause is intended to cover structures described herein that perform the stated function, and not only structural equivalence but also equivalent structures. Other substitutions, modifications, changes, and omissions may be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of this invention. Therefore, the invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0088] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention).

[0089] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An integrated phosphogypsum-based specimen dry-wet cycle and leachate monitoring system, characterized in that: include: The test chamber has a dry area and a wet area therein, with a transfer port that can be controlled to open and close between the dry area and the wet area, the dry area is used to dehumidify the phosphogypsum-based specimens, and the wet area is used to humidify the phosphogypsum-based specimens; The dry-wet cycle test assembly includes a transfer base plate capable of moving back and forth between the dry area and the wet area through the transfer port, a transfer drive unit for driving the transfer base plate, and a spring plate disposed on the transfer base plate and capable of moving up and down. A phosphogypsum-based test piece as a test object is placed on the spring plate. The transfer drive unit is provided with a switch trigger piece. A trigger member that moves up and down with the spring plate is provided below the spring plate. The trigger member is provided with an upper trigger point and a lower trigger point that are respectively located above and below the switch trigger piece and have a conductive function. The trigger member and the switch trigger piece are configured such that: when the trigger member moves upward along with the spring plate until the lower trigger point contacts the switch trigger piece, the transfer drive unit is positively activated to drive the transfer base plate to move from the dry area to the wet area; When the trigger member moves downward along with the spring plate until the upper trigger point contacts the switch trigger plate, the transfer drive unit is reversely activated to drive the transfer base plate to move from the wet area to the dry area; A precision weighing scale is provided on the spring plate, a waterproof tray and a sponge pad are sequentially provided on the precision weighing scale, the phosphogypsum-based specimen is placed on the sponge pad, and the sides of the phosphogypsum-based specimen are wrapped with a rubber film, and a permeable stone plate and filter paper are sequentially provided on the upper and lower sides respectively; The wet-dry cycle test assembly further includes a pH value detection probe and a mass spectrometry module, one end of which is placed on the sponge pad and the other end of which extends from the side of the waterproof tray.

2. The integrated phosphogypsum-based specimen wet-dry cycle and leachate monitoring system according to claim 1, characterized in that: A guide rod passing through the transfer base plate in a vertical direction is provided at the end corner position of the spring plate, and a spring member is sleeved on the guide rod. The lower end of the spring member is connected to the bottom end of the guide rod, and the upper end abuts the transfer base plate.

3. The integrated phosphogypsum-based specimen wet-dry cycle and leachate monitoring system according to claim 1, characterized in that: The transfer drive unit includes a double-headed motor installed under the transfer base plate, two drive gears drivingly connected to the two output shafts of the double-headed motor, and two side-by-side guide racks passing through the transfer port and respectively meshing with the two drive gears are provided between the drying area and the wet area. The switch trigger piece is provided at the end of the double-headed motor, and the switch trigger piece includes an upper switch trigger piece located below the upper trigger point and a lower switch trigger piece located above the lower trigger point.

4. The integrated phosphogypsum-based specimen wet-dry cycle and leachate monitoring system according to claim 3, characterized in that: An upper insulating spacer sheet is provided on the side wall of the drying area and can extend between the upper trigger point in contact state and the upper switch trigger sheet; A lower insulating spacer sheet is provided on the side wall of the wet area and can extend into between the lower trigger point in the contact state and the lower switch trigger sheet.

5. The integrated phosphogypsum-based specimen wet-dry cycle and leachate monitoring system according to claim 1, characterized in that: The trigger component includes a trigger frame connected to the spring plate bottom plate and passing through the transfer base plate. Two trigger rods symmetrically arranged up and down are provided on the trigger frame, and the upper trigger point and the lower trigger point are respectively provided on the two trigger rods.

6. The integrated phosphogypsum-based specimen wet-dry cycle and leachate monitoring system according to claim 1, characterized in that: The drying area is provided with a temperature-controllable electric heating tube and a convection air hole on the top; A humidification spray head connected to an external water pipe is provided above the wet zone, and a flow controller is provided on the external water pipe; The drying zone and the wet zone are respectively provided with infrared measuring devices capable of monitoring the volume change of the phosphogypsum-based specimen in the drying and wetting process in real time.

7. The integrated phosphogypsum-based specimen wet-dry cycle and leachate monitoring system according to claim 1, characterized in that: A retreat cavity is provided at the top of the boundary area between the dry area and the wet area. A partition that can move up and down and a lifting drive member connected to the partition are slidably provided in the retreat cavity. The opening area formed when the partition is lifted up and down constitutes the transfer port.

8. The integrated phosphogypsum-based specimen wet-dry cycle and leachate monitoring system according to claim 7, characterized in that: A sealing block is provided at the lower end of the partition.

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