Device for rapidly detecting residual flocculating agent in washing machine-made sand

Abstract

The utility model discloses a washing machine-made sand residual flocculant rapid detection device which comprises a rack which is arranged on a working table and can move up and down, a storage hopper is fixed on the rack, a partition plate is fixed inside the storage hopper, a pair of discharging pipes are formed downwards at the bottom of the storage hopper, a weighing mechanism is further arranged on the rack, and the weighing mechanism is arranged on the rack. A weighing mechanism is fixed on the rack, a blanking hopper positioned below the weighing mechanism is further fixed on the rack, a pair of magnetic stirrers is arranged on the working table, the bottom end of the blanking hopper extends into the corresponding magnetic stirrer, the two magnetic stirrers are communicated through a guide pipe, and a pair of burettes capable of linearly moving up and down, front and back and left and right are further arranged on the working table. According to the device, a chemical reagent titration mode is adopted, the concentration of the residual flocculating agent in the machine-made sand is calculated through the titration amount of a titration solution, so that whether the residual flocculating agent in the machine-made sand exceeds the standard or not is judged, and the detection mode is simple, rapid and high in accuracy.

Description

Technical Field

[0001] This utility model relates to the field of detecting residual flocculants in manufactured sand, and in particular to a rapid detection device for residual flocculants in water-washed manufactured sand. Background Technology

[0002] Due to environmental regulations, the mining volume of natural sand has gradually decreased and can no longer meet the needs of construction projects. Currently, manufactured sand has become the main raw material for commercial concrete production. However, the production process of manufactured sand generates a large amount of stone powder and a small amount of mud powder, both of which have a negative impact on concrete performance. Measures need to be taken to control the stone powder and mud powder content in manufactured sand. Manufactured sand companies typically use water washing to remove excess stone powder and mud powder, but this generates a large amount of washing wastewater. To avoid environmental pollution, sand manufacturing companies usually treat the washing wastewater by adding flocculants and recirculate the supernatant water for washing sand again, so that a certain amount of flocculant remains on the surface of the manufactured sand particles and in the moisture content of the manufactured sand.

[0003] Polyacrylamide (PAM) is widely used as a flocculant in sand washing wastewater. Studies have found that when the residual amount of polyacrylamide flocculant in manufactured sand exceeds 0.05%, the flocculant adsorbs a certain amount of water-reducing agent, leading to increased concrete fluidity loss and adversely affecting concrete strength. Currently, ready-mixed concrete plants improve concrete workability by increasing admixture dosage, leading to increased production costs. Therefore, ready-mixed concrete plants need to consider testing for residual flocculant in incoming manufactured sand during acceptance inspections. Reasonably controlling the residual flocculant content in manufactured sand can reduce concrete production costs, which is of significant practical importance.

[0004] Existing technologies can detect the flocculant content in sand using spectroscopic methods. However, conventional spectroscopic methods rely on manual observation to determine the depth of light penetration into the stirred sand solution to calculate the flocculant content. This process is highly unstable, resulting in insufficient accuracy of the measurement results. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, this utility model provides a rapid detection device for residual flocculants in water-washed manufactured sand, which can quickly detect the concentration of residual flocculants in manufactured sand with high detection accuracy.

[0006] This utility model provides a rapid detection device for residual flocculants in water-washed manufactured sand, including a frame that is mounted on a workbench and can move up and down. A storage hopper is fixed on the frame, and a partition is fixed inside the storage hopper. A pair of discharge pipes are formed downward at the bottom of the storage hopper. A weighing mechanism is also provided on the frame, and a dropping hopper located below the weighing mechanism is also fixed on the frame. A pair of magnetic stirrers are provided on the workbench, and the bottom end of the dropping hopper extends into the corresponding magnetic stirrer. The two magnetic stirrers are connected by a conduit. A pair of burettes that can move linearly up and down, forward and backward, and left and right are also provided on the workbench. Before the experiment, the discharge pipe of the storage hopper containing the manufactured sand was opened to release the material. The weighing mechanism weighed 200g of manufactured sand, and after closing the corresponding discharge pipe, the discharge pipe of the storage hopper containing distilled water was opened to release the material. Then, 1000g of distilled water was weighed. After weighing the appropriate amount of material, the material fell into the magnetic stirrer through the drop hopper. During the experiment, the left magnetic stirrer was turned on, and the magnetic rotor inside the magnetic stirrer was suspended in the solution to stir the solution. The control switch on the guide tube was turned on, and part of the solution flowed into the right magnetic stirrer through the guide tube, where titration could be performed through the burette.

[0007] As a further technical solution, a pair of lifting cylinders are fixed on the worktable, with the output ends of the two lifting cylinders respectively fixed to the front and rear sides of the frame. The extension and retraction of the lifting cylinders can be used to control the height of the storage hopper, facilitating the testing process.

[0008] As a further technical solution, the top of the collection chamber is open, and a pair of feed inlets are provided on the top of the storage hopper. A pair of baffles are hinged to the corresponding positions on the storage hopper. The opening and closing of the feed inlets are controlled by the baffles. By rotating the baffles, material can be added to the inside of the storage hopper through the feed inlets.

[0009] As a further technical solution, multiple weighing sensors are fixed on the frame, and a weighing chamber is jointly fixed to the multiple weighing sensors. A material discharge pipe is located at the bottom of the weighing chamber. A rectangular frame fixed to the frame is attached to the bottom of the multiple weighing sensors. The bottom of the weighing chamber is located within the rectangular space formed by the rectangular frame. A material discharge hopper is fixed to the bottom of the rectangular frame. A control cylinder is fixed on the frame, and a sliding plate that slides left and right within the rectangular frame is fixed to the output end of the control cylinder. After the weighing chamber weighs a suitable weight of material through the weighing sensors, the material discharge pipe at the bottom of the weighing chamber closes, allowing for repeated weighing operations.

[0010] As a further technical solution, a pair of guide plates are fixed to the inner walls of both sides of the weighing chamber. These can be used to guide materials into the discharge pipe, reducing residue on the inner wall of the weighing chamber.

[0011] As a further technical solution, an upper and lower linear module is fixed on the worktable. A motion plate is fixed to the output end of the upper and lower linear module. A pair of left and right linear modules are fixed to the left side of the motion plate. The output ends of the pair of left and right linear modules are jointly fixed to a front and rear linear module. The burette is detachably installed at the output end of the front and rear linear module. The orientation of the burette can be flexibly adjusted by the upper and lower linear modules, left and right linear modules, and front and rear linear modules, eliminating the need for the operator to hold the burette and reducing the possibility of accidental spillage of the solution in the burette.

[0012] As a further technical solution, the pair of burettes are respectively fixed to the output ends of the front and rear linear modules using clamps. This allows for convenient installation and removal of the burettes.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] This invention first samples water-washed manufactured sand for drying. Then, the corresponding baffle is opened, and the dried manufactured sand is poured into the manufactured sand storage space of the storage hopper for storage. Distilled water is poured into the distilled water storage space of the storage hopper for storage. The weighing sensor is activated, and the discharge pipe of the manufactured sand in the storage hopper is opened first to release the material. The weighing chamber weighs the manufactured sand first, and after closing the corresponding discharge pipe, the discharge pipe of the distilled water in the storage hopper is opened to release the material. The distilled water is then weighed. After weighing the appropriate amount of material, the material falls into the left magnetic stirrer through the drop hopper. The left magnetic stirrer is started and stirred at a speed of 800 r / min for 60 minutes, while the water temperature is heated to 60-80℃. Increasing the water temperature reduces the stirring time. After stirring is completed, the experimenter opens the control switch of the conduit, and the solution flows into the right magnetic stirrer. Since the conduit is set at the 900mL height mark, 100-200mL of solution flows into the right magnetic stirrer through the conduit.

[0015] During titration, the experimenter first opened the standard indicator solution dropper, added 2-3 drops of indicator solution to the right magnetic stirrer 8, and then closed it. Next, the hydrochloric acid standard solution dropper was opened, and standard hydrochloric acid was added to the solution in the right magnetic stirrer 8. The right magnetic stirrer was then started and stirred at a speed of 400 r / min. When the color of the solution in the right magnetic stirrer 8 changed and stabilized for 30 seconds, this was the titration endpoint. The experimenter randomly recorded the amount of standard hydrochloric acid titrated and calculated the concentration of residual flocculant in the manufactured sand to determine whether the residual flocculant in the manufactured sand exceeded the standard.

[0016] This invention uses chemical reagent titration to calculate the concentration of residual flocculant in manufactured sand by measuring the titration amount of the solution, thereby determining whether the residual flocculant in the manufactured sand exceeds the standard. The detection method is simple, fast, and highly accurate.

[0017] The orientation of the burette can be flexibly adjusted by the up-down linear module, the left-right linear module, and the front-back linear module, eliminating the need for staff to hold the burette and reducing the possibility of accidental spillage of the solution inside the burette. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a rapid detection device for residual flocculant in water-washed manufactured sand, provided as an embodiment of the present invention.

[0020] Figure 2 A cross-sectional view of the storage hopper and weighing chamber in a rapid detection device for residual flocculant in water-washed manufactured sand provided in an embodiment of this utility model.

[0021] Figure 3 A top view of the connection structure between the rectangular frame, control cylinder and slide plate in a rapid detection device for residual flocculant in water-washed manufactured sand provided in an embodiment of this utility model.

[0022] Figure 4 This is a schematic diagram of the material discharge hopper in a rapid detection device for residual flocculant in water-washed manufactured sand, provided as an embodiment of the present invention.

[0023] Figure 5 A top view of the installation position of the burette in a rapid detection device for residual flocculant in water-washed manufactured sand, provided in an embodiment of this utility model.

[0024] In the diagram: 1. Workbench; 2. Frame; 3. Storage hopper; 31. Baffle; 4. Divider; 5. Discharge pipe; 6. Weighing mechanism; 61. Weighing sensor; 62. Weighing chamber; 63. Drop pipe; 64. Rectangular frame; 65. Guide plate; 7. Drop hopper; 8. Magnetic stirrer; 9. Lifting cylinder; 10. Guide tube; 11. Upper and lower linear modules; 12. Motion plate; 13. Left and right linear modules; 14. Front and rear linear modules; 15. Clamp; 16. Burette. Detailed Implementation

[0025] The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and accompanying drawings of this utility model are intended to cover a non-exclusive inclusion, such as a process, method, system, product, or device that includes a series of steps or units, not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. In addition, the technical features of the various embodiments or individual embodiments provided by this utility model can be arbitrarily combined to form new technical solutions. Such combinations are not bound by the order of steps and / or structural composition patterns, but must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0027] This utility model embodiment provides a rapid detection device for residual flocculant in water-washed manufactured sand, including a frame 2 that is mounted on a workbench 1 and can move up and down. A storage hopper 3 is fixed on the frame 2, and a partition 4 is fixed inside the storage hopper 3. The partition 4 divides the internal storage space of the storage hopper 3 into two parts, one half for storing manufactured sand and the other half for storing distilled water. A pair of discharge pipes 5 are formed downward at the bottom of the storage hopper 3. There are control valves on the discharge pipes 5. One discharge pipe 5 is used to control the discharge of manufactured sand, and the other discharge pipe 5 is used to control the discharge of distilled water. A weighing mechanism 6 is also provided on the frame 2 for weighing 200g of manufactured sand and 1000g of distilled water. A dropping hopper 7 located below the weighing mechanism 6 is also fixed on the frame 2. A pair of magnetic stirrers 8 are on the workbench 1, and the bottom end of the dropping hopper 7 extends into the corresponding magnetic stirrer 8.

[0028] A pair of lifting cylinders 9 are fixed on the workbench 1. The output ends of the two lifting cylinders 9 are fixed on the front and rear sides of the frame 2 respectively. By extending and retracting the lifting cylinders 9, the height of the storage hopper 3 can be controlled to facilitate the test.

[0029] The top of the storage hopper 3 is provided with a pair of feed inlets, and a pair of baffles 31 are hinged to the corresponding positions on the storage hopper 3. The opening and closing of the feed inlets are controlled by the baffles 31. By rotating the baffles 31, the material can be added to the inside of the storage hopper 3 through the feed inlets.

[0030] First, the lifting cylinder 9 retracts, extending the bottom of the hopper 7 on the frame 2 into the corresponding magnetic stirrer 8. Mechanized sand and distilled water are stored in the storage hopper 3 through the inlet. Before the test, the discharge pipe 5 of the storage hopper 3 containing the mechanized sand is opened to release the material. The weighing mechanism 6 first weighs 200g of mechanized sand, then closes the corresponding discharge pipe 5. Next, the discharge pipe 5 of the storage hopper 3 containing the distilled water is opened to release the material, followed by the weighing of 1000g of distilled water. After weighing the appropriate amount of material, the material falls into the magnetic stirrer 8 through the hopper 7. During the test, the left magnetic stirrer 8 is turned on. The magnetic rotor inside the magnetic stirrer 8 is suspended in the solution to stir the solution. The magnetic stirrer 8 also has a heating function, capable of heating the solution to 60-80℃ to promote the reaction.

[0031] The two magnetic stirrers 8 are connected by a conduit 10. The conduit 10 is equipped with a control switch to control its on / off state. The stirring tank of the magnetic stirrer 8 is transparent and has graduation lines. The conduit 10 is set at the 900ml mark on the surface of the stirring tank. Since the conduit 10 is set at the 900mL mark, 100-200mL of solution flows through the conduit 10 into the magnetic stirrer 8 on the right, and titration can be performed.

[0032] As for how the weighing mechanism 6 weighs the materials, such as Figure 2-3 As shown, multiple weighing sensors 61 are fixed on the frame 2, and a weighing chamber 62 is fixed on all the weighing sensors 61. The bottom of the weighing chamber 62 has a discharge pipe 63, and a rectangular frame 64 fixed to the bottom of the multiple weighing sensors 61 is fixed on the frame 2. The discharge pipe 63 at the bottom of the weighing chamber 62 is located in the rectangular space formed by the rectangular frame 64. The discharge hopper 7 is fixed to the bottom of the rectangular frame 64. The material in the weighing chamber 62 can fall into the discharge hopper 7 through the discharge pipe 63 and the rectangular frame 64. There is a control valve on the discharge pipe 63 to control its opening and closing. After the weighing chamber 62 weighs the material of a suitable weight through the weighing sensors 61, the discharge pipe 63 at the bottom of the weighing chamber 62 opens, and the material can fall into the discharge hopper 7 through the discharge pipe 63 and the rectangular frame 64. The discharge pipe 63 at the bottom of the weighing chamber 62 closes, and subsequent weighing operations can be repeated.

[0033] A pair of guide plates 65 are fixed on the inner walls of both sides of the weighing chamber 62, which can be used to guide the material into the discharge pipe 63 and reduce the residue on the inner wall of the weighing chamber 62.

[0034] A vertical linear module 11 is fixed on the worktable 1. A motion plate 12 is fixed to the output end of the vertical linear module 11. A pair of horizontal linear modules 13 are fixed to the left side of the motion plate 12. A front-back linear module 14 is fixed to the output end of the pair of horizontal linear modules 13. A burette 16 is fixed to the output end of the front-back linear module 14 through a pair of clamps 15. The position of the burette 16 can be flexibly controlled by the vertical linear module 11, the horizontal linear module 13, and the front-back linear module 14. The initial position of the front and rear linear module 14 is located on the right side of the stroke of the left and right linear module 13. First, a pair of burettes 16 are installed to the output end of the front and rear linear module 14 through the clamp 15. The upper and lower linear module 11 controls the burettes 16 to move upward until the bottom height of the burettes 16 exceeds the height of the right magnetic stirrer 8. Then, the left and right linear module 13 controls the burettes 16 to move to the left and directly above the right magnetic stirrer 8. Then, the upper and lower linear module 11 controls the burettes 16 to move downward, so that the liquid outlet tube of the burettes 16 can extend into the magnetic stirrer 8, which is convenient for the operator. At the same time, the operator does not need to hold the burettes 16 to operate, reducing the possibility of accidental spillage of the solution in the burettes 16.

[0035] A pair of burettes 16 are a standard indicator solution burette and a hydrochloric acid standard solution burette, respectively. The standard indicator solution burette has a capacity of 100 mL. The experimenter adds the standard indicator solution through a pipette, and after addition, seals it with a frosted cap. It has a dropper at the bottom and a switch for adjustment. The hydrochloric acid standard solution burette has a capacity of 1000 mL. The experimenter adds the standard indicator solution through a pipette, and after addition, seals it with a frosted cap. It has a dropper at the bottom and a switch for adjustment. The specific structure and operating principle of the burettes 16 are existing known technologies and will not be described in detail here.

[0036] During titration, the experimenter first opened the standard indicator solution dropper, added 2-3 drops of indicator solution to the magnetic stirrer 8 on the right, and then closed it. Next, the hydrochloric acid standard solution dropper was opened, and standard hydrochloric acid was added to the solution in the magnetic stirrer 8. The magnetic stirrer 8 was then started and stirred at a speed of 400 r / min. When the color of the solution in the magnetic stirrer 8 changed and stabilized for 30 seconds, this was the titration endpoint. The experimenter randomly recorded the amount of standard hydrochloric acid titrated and calculated the concentration of residual flocculant in the manufactured sand to determine whether the residual flocculant in the manufactured sand exceeded the standard.

[0037] Preparation of standard indicator solution:

[0038] 1) Methyl orange: Used to indicate changes in the acidity or alkalinity of a solution. To prepare it, weigh 0.05g of methyl orange and dissolve it in distilled water at 70℃. After cooling, dilute to 50mL and store in a brown bottle. It is valid for 15 days.

[0039] 2) Sodium indigo disulfonate: Used to indicate the color change of a solution. To prepare, weigh 0.25g of sodium indigo disulfonate and add 50mL of distilled water. Store in a brown bottle. Shelf life is 15 days.

[0040] 3) Using two droppers with a dropper volume ratio of 1:1, add two drops each of methyl orange and sodium indigo disulfonate indicator to the sample solution, stir well, and the sample solution will turn yellow-green.

[0041] Preparation of hydrochloric acid standard solution: This experiment requires the preparation of a 0.1 mol / L hydrochloric acid standard solution.

[0042] 1) First, measure 1000mL of distilled water and pour it into a 1000mL reagent bottle;

[0043] 2) Then measure 9 mL of concentrated hydrochloric acid with a glass pipette, slowly add the measured concentrated hydrochloric acid to a reagent bottle that has been pre-filled with an appropriate amount of water, and stir with a glass rod.

[0044] 3) After adding the concentrated hydrochloric acid, shake the solution well.

[0045] In summary, in the above embodiments, the experimenters first sampled and washed the manufactured sand, then dried it. Then, they opened the corresponding baffle 31 and poured the dried manufactured sand into the manufactured sand storage space of the storage hopper 3 for storage. Distilled water was poured into the distilled water storage space of the storage hopper 3 for storage. The weighing sensor 61 was activated, so that the discharge pipe 5 of the storage hopper 3 storing manufactured sand was opened first to discharge the material. The weighing chamber 62 first weighed 200g of manufactured sand. After closing the corresponding discharge pipe 5, the discharge pipe 5 of the storage hopper 3 storing distilled water was opened to discharge the material. Then, 1000g of distilled water was weighed. After weighing the appropriate amount of material, the material fell into the magnetic stirrer 8 on the left side through the drop hopper 7.

[0046] Start the left magnetic stirrer 8 and stir at 800 r / min for 60 min, while heating the water to 60-80℃. Increasing the water temperature reduces the stirring time. After stirring is complete, the experimenter turns on the control switch of the conduit 10, and the solution flows into the right magnetic stirrer 8. Since the conduit 10 is set at the 900 mL mark, 100-200 mL of solution flows through the conduit 10 into the right magnetic stirrer 8.

[0047] The experimenter first opened the standard indicator solution dropper, added 2-3 drops of indicator solution to the right magnetic stirrer 8, and then closed it. Next, the hydrochloric acid standard solution burette was opened, and standard hydrochloric acid was added to the solution in the right magnetic stirrer 8. The right magnetic stirrer 8 was then started and stirred at a speed of 400 r / min. When the color of the solution in the right magnetic stirrer 8 changed and stabilized for 30 seconds, this was the titration endpoint. The experimenter randomly recorded the amount of standard hydrochloric acid titrated and calculated the concentration of residual flocculant in the manufactured sand to determine whether the residual flocculant in the manufactured sand exceeded the standard.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of this utility model.

Claims

1. A rapid detection device for residual flocculant in water-washed manufactured sand, characterized in that, The machine includes a frame (2) that is mounted on a workbench (1) and can move up and down. A storage hopper (3) is fixed on the frame (2). A partition (4) is fixed inside the storage hopper (3). A pair of discharge pipes (5) are formed downward at the bottom of the storage hopper (3). A weighing mechanism (6) is also provided on the frame (2). A dropping hopper (7) located below the weighing mechanism (6) is also fixed on the frame (2). A pair of magnetic stirrers (8) are on the workbench (1). The bottom end of the dropping hopper (7) extends into the corresponding magnetic stirrer (8). The two magnetic stirrers (8) are connected by a conduit (10). A pair of burettes (16) that can move linearly up and down, forward and backward, and left and right are also provided on the workbench (1).

2. The rapid detection device for residual flocculant in water-washed manufactured sand according to claim 1, characterized in that, A pair of lifting cylinders (9) are fixed on the workbench (1), and the output ends of the two lifting cylinders (9) are respectively fixed on the front and rear sides of the frame (2).

3. The rapid detection device for residual flocculant in water-washed manufactured sand according to claim 1, characterized in that, The top of the storage hopper (3) is provided with a pair of feed inlets, and a pair of baffles (31) are hinged to the corresponding positions on the storage hopper (3).

4. The rapid detection device for residual flocculant in water-washed manufactured sand according to claim 1, characterized in that, Multiple weighing sensors (61) are fixed on the frame (2). A weighing chamber (62) is fixed on the multiple weighing sensors (61). A material drop pipe (63) is located at the bottom of the weighing chamber (62). A rectangular frame (64) fixed on the frame (2) is fixed at the bottom of the multiple weighing sensors (61). The bottom end of the weighing chamber (62) is located in the rectangular space formed by the rectangular frame (64). The material drop hopper (7) is fixed at the bottom of the rectangular frame (64).

5. The rapid detection device for residual flocculant in water-washed manufactured sand according to claim 4, characterized in that, The weighing chamber (62) has a pair of guide plates (65) fixed on its two inner walls.

6. The rapid detection device for residual flocculant in water-washed manufactured sand according to claim 1, characterized in that, The workbench (1) is fixed with an upper and lower linear module (11), and a motion plate (12) is fixed to the output end of the upper and lower linear module (11). A pair of left and right linear modules (13) are fixed to the left side of the motion plate (12). The output ends of the pair of left and right linear modules (13) are jointly fixed with a front and rear linear module (14). The burette (16) is detachably installed at the output end of the front and rear linear module (14).

7. The rapid detection device for residual flocculant in water-washed manufactured sand according to claim 6, characterized in that, The pair of burettes (16) are respectively fixed to the output ends of the front and rear linear modules (14) by clamps (15).

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