Phosphogypsum roadbed material mixing station

Abstract

The invention relates to an ardealite roadbed material mixing station, a batching system comprises a plurality of discharging devices, and materials discharged by one discharging device comprise ardealite; the first conveying device is used for conveying materials discharged by the discharging devices into the stirring system, and a first dynamic metering device for weighing the materials as a first dynamic flow value of a whole is further arranged at an outlet of the first conveying device; the cement supply system supplies cement to the stirring system; the additive supply system is used for supplying an additive into the stirring system; the water supply system supplies water to the stirring system; the second conveying device is used for conveying the mixed roadbed material in the stirring system to a finished product bin; and the control system is connected with the first dynamic metering device, the cement supply system, the additive supply system and the water supply system, and dynamically controls the supply quantity of the cement, the additive and the water according to the first dynamic flow value and the designed mix proportion. The problems that in the prior art, the proportioning proportion is not easy to control, and the proportioning accuracy is poor can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of mixing equipment for road foundation construction, and in particular to a phosphogypsum roadbed material mixing station. Background Art

[0002] The roadbed material mixing plant (water stabilization station) is an important engineering equipment for road construction at present. It is responsible for providing high-quality base materials for road construction and is specially used for mixing various stable mixtures with hydraulic materials as binders. Since the mixing of the mixture is carried out in a fixed site, the roadbed material mixing plant has the advantages of accurate material grading, uniform mixing, and material saving. Therefore, it is widely used in the construction of base and subbase of high-grade highways and urban roads. With the increasing demand for mixing roadbed materials with different dosages of phosphogypsum, this puts forward high requirements for the roadbed material mixing plant to adapt to various working conditions.

[0003] In the actual production process, crushed stone and phosphogypsum are fed according to the set ratio, and the subsequent cement, water, admixtures, etc. are fed according to the set ratio based on the total amount of crushed stone and phosphogypsum. However, compared with crushed stone, phosphogypsum has a relatively high water content (generally ≥10%) and high viscosity, and is easily adhered to the equipment during the production process, which will make it difficult to feed the material from the batching hopper of the current factory mixing equipment, and then make the phosphogypsum feeding uneven, sometimes feeding more, sometimes feeding less, resulting in the crushed stone and phosphogypsum not actually being fed strictly according to the set ratio, so that the total amount of crushed stone and phosphogypsum will fluctuate, and the subsequent cement, water, admixtures, etc. will still be fed according to the set ratio, making the proportion of ingredients difficult to control and the accuracy of the ratio poor. Summary of the invention

[0004] The embodiment of the present application provides a phosphogypsum roadbed material mixing station to solve the problem in the related art that the proportion of ingredients is difficult to control and the proportion accuracy is poor.

[0005] The embodiment of the present application provides a phosphogypsum roadbed material mixing station, which includes:

[0006] A batching system, the batching system comprising a plurality of feeding devices, wherein the material discharged by one of the feeding devices comprises phosphogypsum;

[0007] A first conveying device, which is used to deliver the materials discharged by each material discharge device into the mixing system, and the outlet of the first conveying device is also provided with a first dynamic metering device for weighing the first dynamic flow value of each material as a whole;

[0008] A cement supply system, which is used to supply cement to the mixing system;

[0009] An additive supply system, which is used to supply additives to the stirring system;

[0010] A water supply system, used for supplying water to the stirring system;

[0011] A second conveying device is used to convey the roadbed material mixed in the mixing system to the finished product silo;

[0012] A control system is connected to the first dynamic metering device, cement supply system, admixture supply system and water supply system, and is used to dynamically control the supply of cement, admixture and water according to the first dynamic flow value and the designed mix ratio.

[0013] In some embodiments, the outlet of the second conveying device is further provided with a second dynamic metering device for weighing a second dynamic flow value of the mixed roadbed material;

[0014] The control system is connected to the second dynamic metering device and is used to determine whether the cement supply is normal according to the second dynamic flow value and a designed threshold range.

[0015] In some embodiments, if the second dynamic flow value is within the design threshold range, cement supply is normal;

[0016] Otherwise, cement supply is abnormal.

[0017] In some embodiments, the feeding device comprises:

[0018] Feeding funnel;

[0019] A belt scale is located below the discharge hopper and is used to transport the discharged materials to the first conveying device.

[0020] In some embodiments, one of the feeding devices further comprises a phosphogypsum crushing device, and an output port of the phosphogypsum crushing device faces the feeding hopper.

[0021] In some embodiments, along the conveying direction of the material, the stirring system includes a first stirring device and a second stirring device connected to each other, the first stirring device is connected to the first conveying device, and the second stirring device is connected to the second conveying device.

[0022] In some embodiments, the first stirring device comprises a rotating shaft and stirring blades for stirring the material, and each of the stirring blades is arranged on the rotating shaft at intervals along the length direction of the rotating shaft;

[0023] The orientation of a portion of the stirring blades is configured to: drive the material to move downstream along the conveying direction of the material;

[0024] The direction of the stirring blades of the other part is configured to drive the material to move upstream along the conveying direction of the material.

[0025] In some embodiments, the number of stirring blades configured to drive the material to move upstream along the conveying direction of the material accounts for 1 / 3 of the number of all stirring blades.

[0026] In some embodiments, the first dynamic metering device includes a data processing module, a weighing sensor for weighing the weight of material per unit length on the first conveying device, and a speed sensor for measuring the material transmission speed on the first conveying device. The data processing module is connected to the weighing sensor and the speed sensor, and is used to obtain a first dynamic flow value based on the material weight per unit length and the material transmission speed.

[0027] In some embodiments, the inner wall of the finished product silo is provided with a polytetrafluoroethylene plate.

[0028] The beneficial effects of the technical solution provided by this application include:

[0029] The embodiment of the present application provides a phosphogypsum roadbed material mixing station, in which each feeding device feeds phosphogypsum and crushed stone according to the designed mix ratio. Since crushed stone has no viscosity, it is usually fed according to the designed mix ratio. However, phosphogypsum has viscosity and is easy to agglomerate. Therefore, the phosphogypsum actually fed may not meet the designed mix ratio, which results in the total amount of phosphogypsum and crushed stone actually fed to the first conveying device being different from the total amount of phosphogypsum and crushed stone fed to the first conveying device according to the designed mix ratio. If the supply of cement, admixture and water is still controlled according to the corresponding proportions based on the total amount of phosphogypsum and crushed stone fed to the first conveying device according to the designed mix ratio, poor mix ratio accuracy will inevitably result. Therefore, in the present application, a first dynamic metering device is arranged at the outlet of the first conveying device, and the first dynamic metering device is used to weigh the total amount of phosphogypsum and gravel actually discharged into the first conveying device, that is, the first dynamic flow value. Based on the first dynamic flow value, the supply amount of cement, admixture and water is controlled according to the corresponding proportion, so that cement, admixture and water are supplied dynamically, thereby improving the accuracy of the proportion. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A module diagram of a phosphogypsum roadbed material mixing station provided in an embodiment of the present application;

[0032] Figure 2 A schematic diagram of a first stirring device provided in an embodiment of the present application;

[0033] Figure 3 This is a module diagram of the first dynamic metering device provided in an embodiment of the present application.

[0034] In the figure: 1. unloading device; 2. first conveying device; 3. stirring system; 4. cement supply system; 5. admixture supply system; 6. water supply system; 7. second conveying device; 8. finished product silo; 9. unloading funnel; 10. belt scale; 11. first stirring device; 12. second stirring device; 13. rotating shaft; 14. data processing module; 15. weighing sensor; 16. speed sensor; 17. stirring blade. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0036] See also Figure 1 As shown, an embodiment of the present application provides a phosphogypsum roadbed material mixing station, which includes a batching system, a first conveying device 2, a stirring system 3, a cement supply system 4, an admixture supply system 5, a water supply system 6, a second conveying device 7, a finished product silo 8 and a control system, wherein the batching system includes a plurality of feeding devices 1, wherein the material discharged by one of the feeding devices 1 includes phosphogypsum, and the materials discharged by the remaining feeding devices 1 may be gravel.

[0037] The materials discharged by each feeding device 1 directly enter the first conveying device 2, and the first conveying device 2 is used to deliver the materials discharged by each feeding device 1 into the mixing system 3. The outlet of the first conveying device 2 is also provided with a first dynamic metering device, and the first dynamic metering device is used to weigh the first dynamic flow value of each material as a whole (that is, each material becomes a mixture after entering the first conveying device 2); the cement supply system 4 is used to supply cement to the mixing system 3, the admixture supply system 5 is used to supply admixture to the mixing system 3, the water supply system 6 is used to supply water to the mixing system 3, and the second conveying device 7 is used to transport the roadbed materials mixed in the mixing system 3 to the finished product silo 8.

[0038] The control system is connected to the first dynamic metering device, cement supply system 4, admixture supply system 5 and water supply system 6, and is used to dynamically control the supply of cement, admixture and water according to the first dynamic flow value and the designed mix ratio.

[0039] The principles of this application are as follows:

[0040] Each feeding device 1 feeds phosphogypsum and crushed stone according to the designed mix ratio. Since crushed stone has no viscosity, it is usually fed according to the designed mix ratio. However, phosphogypsum is sticky and easy to agglomerate. Therefore, the phosphogypsum actually fed may not meet the designed mix ratio. This causes the total amount of phosphogypsum and crushed stone actually fed to the first conveying device 2 to be different from the total amount of phosphogypsum and crushed stone fed to the first conveying device 2 according to the designed mix ratio. If the supply of cement, admixture and water is still controlled according to the corresponding proportions based on the total amount of phosphogypsum and crushed stone fed to the first conveying device 2 according to the designed mix ratio, it will inevitably lead to poor mix accuracy. Therefore, in the present application, a first dynamic metering device is arranged at the outlet of the first conveying device 2, and the first dynamic metering device is used to weigh the total amount of phosphogypsum and gravel actually discharged into the first conveying device 2, that is, the first dynamic flow value. Based on the first dynamic flow value, the supply amount of cement, admixture and water is controlled according to the corresponding proportion, so that cement, admixture and water are supplied dynamically, the proportion of ingredients is easy to control, and the accuracy of the proportion is improved.

[0041] It can be understood that the first conveying device 2, cement supply system 4, admixture supply system 5, water supply system 6, second conveying device 7, and finished product silo 8 directly adopt existing equipment, and their specific structures are not described in detail here.

[0042] It can be understood that the crushed stones discharged by the above-mentioned each feeding device 1 can be of different grades or of the same grade, so that the present application can produce both high-content phosphogypsum roadbed materials without graded crushed stones and low-content phosphogypsum roadbed materials with graded crushed stones.

[0043] It is understandable that since crushed stone has no stickiness, it is usually fed according to the designed mix ratio and generally there will be no supply problems. However, phosphogypsum is sticky and easy to agglomerate, so a flow threshold range can be set for the first dynamic flow value. The control system can determine whether the supply of phosphogypsum is normal based on the first dynamic flow value and the flow threshold range. If the first dynamic flow value is within the flow threshold range, the supply of phosphogypsum is normal. If it is not within the flow threshold range, it means that there is an abnormality in the supply of phosphogypsum, such as severe agglomeration, etc. At this time, an alarm can be issued and production personnel can enter the site for maintenance.

[0044] Furthermore, for cement, water and admixtures, water and admixtures are in a fluid state, and usually there will be no supply problems when feeding, while cement has a certain viscosity, and there may be supply problems when feeding, such as blockage, etc. Therefore, in order to be able to know the cement supply situation in time, in some preferred embodiments, the outlet of the second conveying device 7 is also provided with a second dynamic metering device for weighing the second dynamic flow value of the mixed roadbed material; the control system is connected to the second dynamic metering device, and is used to judge whether the cement supply is normal according to the second dynamic flow value and the design threshold range.

[0045] If the second dynamic flow value is within the design threshold range, the cement supply is normal; otherwise, the cement supply is abnormal.

[0046] It is understandable that the second dynamic metering device and the first dynamic metering device can be the same device.

[0047] Further, see Figure 1 As shown, the material discharge device 1 includes a material discharge hopper 9 and a belt scale 10 . The belt scale 10 is located below the material discharge hopper 9 and is used to transport the discharged material to the first conveying device 2 .

[0048] It is understandable that the discharge hopper 9 and the belt scale 10 directly adopt existing equipment, and their specific structures are not described in detail here.

[0049] In order to facilitate the unloading of phosphogypsum, one of the unloading devices 1 further includes a phosphogypsum crushing device, and the output port of the phosphogypsum crushing device faces the unloading funnel 9.

[0050] The phosphogypsum crushing device can be used to crush the lumps in the raw phosphogypsum, thus solving the problem of low batching efficiency and difficult control of batching proportions due to the high viscosity and poor fluidity of phosphogypsum.

[0051] It is understandable that the above-mentioned phosphogypsum crushing device directly adopts existing equipment, and its specific structure will not be described here.

[0052] Further, see Figure 1 As shown, in the present application, along the conveying direction of the material, the stirring system 3 includes a first stirring device 11 and a second stirring device 12 connected to each other, the first stirring device 11 is connected to the first conveying device 2, and the second stirring device 12 is connected to the second conveying device 7.

[0053] The first stirring device 11 performs preliminary stirring on the materials to preliminarily mix the materials, and the second stirring device 12 performs sufficient stirring and mixing on the materials to form a water-stable material with stable quality.

[0054] It is understandable that the first stirring device 11 and the second stirring device 12 directly adopt existing equipment, and their specific structures are not described in detail here.

[0055] Further, in order to extend the initial mixing time and improve the mixing uniformity, see Figure 2 As shown, the first stirring device 11 includes a rotating shaft 13 and stirring blades 17 for stirring the material, and each stirring blade 17 is arranged on the rotating shaft 13 at intervals along the length direction of the rotating shaft 13; the direction of a part of the stirring blades 17 is configured to: drive the material to move downstream along the conveying direction of the material; the direction of another part of the stirring blades 17 is configured to: drive the material to move upstream along the conveying direction of the material.

[0056] In this embodiment, the first stirring device 11 is improved on the basis of the existing equipment, mainly by installing a part of the stirring blades 17 in reverse, so that when the forward stirring blade 17 drives the material to move downstream, when it encounters the reverse stirring blade 17, the reverse stirring blade 17 drives the material to move upstream. In this way, the stirring time of the material in the first stirring device 11 can be extended, the mixing uniformity is improved, and the initial stirring effect is better. Compared with extending the length of the stirring device, this solution occupies less space.

[0057] Further, the number of the stirring blades 17 configured to drive the material to move upstream along the conveying direction of the material accounts for 1 / 3 of the number of all the stirring blades 17 .

[0058] See also Figure 3 As shown, the first dynamic metering device includes a data processing module 14, a weighing sensor 15 for weighing the weight of the material per unit length on the first conveying device 2, and a speed sensor 16 for measuring the material transmission speed on the first conveying device 2. The data processing module 14 is connected to the weighing sensor 15 and the speed sensor 16, and is used to obtain a first dynamic flow value based on the material weight per unit length and the material transmission speed.

[0059] For example, the instantaneous flow rate w(t) of the material measured by the dynamic metering device depends on two parameters, namely, the dynamic flow rate value is equal to the product of the material weight per unit length q (kg / m) measured by the weighing sensor 15 and the material transmission speed v (m / s) measured by the speed sensor 16, that is, w(t)=qv.

[0060] Furthermore, the inner wall of the finished product silo 8 is provided with a polytetrafluoroethylene plate to reduce the amount of roadbed material attached to the inner wall of the finished product silo 8.

[0061] In summary, the phosphogypsum roadbed material mixing station provided in the present application solves the problem that the current stabilized soil plant mixing equipment has poor material discharge from the mixing hopper of the improved soil or viscous material and low mixing productivity through the special settings of the batching system, the mixing system and the conveying device. The equipment can produce both large-amount phosphogypsum roadbed materials without graded gravel and small-amount phosphogypsum roadbed materials with graded gravel.

[0062] Compared with the existing technology, this application has the characteristics of strong adaptability, large volume, high efficiency, large production capacity, etc., and can ensure the uniformity of the finished material. This application is a plant mixing equipment with reasonable structure, advanced technology, high quality and high efficiency. It meets the complex construction requirements of different formulas and different customers, and its technical performance reaches the domestic advanced level.

[0063] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0064] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0065] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A phosphogypsum roadbed material mixing station, characterized in that: It includes: A batching system, the batching system comprising a plurality of material discharging devices (1), wherein the material discharged by one of the material discharging devices (1) comprises phosphogypsum; A first conveying device (2) is used to convey the materials discharged by each material discharge device (1) into the stirring system (3); the outlet of the first conveying device (2) is also provided with a first dynamic metering device for weighing the first dynamic flow value of each material as a whole; A cement supply system (4) for supplying cement to the mixing system (3); An additive supply system (5) for supplying additives to the stirring system (3); a water supply system (6), used for supplying water to the stirring system (3); A second conveying device (7) is used to convey the roadbed material mixed in the mixing system (3) to a finished product silo (8); A control system is connected to the first dynamic metering device, the cement supply system (4), the admixture supply system (5) and the water supply system (6), and is used to dynamically control the supply amounts of cement, admixture and water according to the first dynamic flow value and the designed mix ratio.

2. The phosphogypsum roadbed material mixing station according to claim 1, characterized in that: The outlet of the second conveying device (7) is also provided with a second dynamic metering device for weighing a second dynamic flow value of the mixed roadbed material; The control system is connected to the second dynamic metering device and is used to determine whether the cement supply is normal according to the second dynamic flow value and a designed threshold range.

3. The phosphogypsum roadbed material mixing station according to claim 2, characterized in that: If the second dynamic flow value is within the design threshold range, the cement supply is normal; Otherwise, cement supply is abnormal.

4. The phosphogypsum roadbed material mixing station according to claim 1, characterized in that: The unloading device (1) comprises: Feeding hopper (9); A belt scale (10) is located below the discharge hopper (9) and is used to transport the discharged material to the first conveying device (2).

5. The phosphogypsum roadbed material mixing station according to claim 4, characterized in that: One of the feeding devices (1) further comprises a phosphogypsum crushing device, wherein an output port of the phosphogypsum crushing device faces the feeding hopper (9).

6. The phosphogypsum roadbed material mixing station according to claim 1, characterized in that: Along the conveying direction of the material, the stirring system (3) comprises a first stirring device (11) and a second stirring device (12) which are connected to each other, wherein the first stirring device (11) is connected to the first conveying device (2), and the second stirring device (12) is connected to the second conveying device (7).

7. The phosphogypsum roadbed material mixing station according to claim 6, characterized in that: The first stirring device (11) comprises a rotating shaft (13) and stirring blades (17) for stirring materials, wherein each stirring blade (17) is arranged on the rotating shaft (13) at intervals along the length direction of the rotating shaft (13); A portion of the stirring blades (17) are oriented to drive the material to move downstream along the material conveying direction; The direction of the stirring blade (17) of the other part is configured to drive the material to move upstream along the conveying direction of the material.

8. The phosphogypsum roadbed material mixing station according to claim 7, characterized in that: The number of stirring knives (17) configured to drive the material to move upstream along the conveying direction of the material accounts for 1 / 3 of the number of all stirring knives (17).

9. The phosphogypsum roadbed material mixing station according to claim 1, characterized in that: The first dynamic metering device comprises a data processing module (14), a weighing sensor (15) for weighing the weight of a material per unit length on the first conveying device (2), and a speed sensor (16) for measuring the material transmission speed on the first conveying device (2); the data processing module (14) is connected to the weighing sensor (15) and the speed sensor (16), and is used to obtain a first dynamic flow value based on the material weight per unit length and the material transmission speed.

10. The phosphogypsum roadbed material mixing station according to claim 1, characterized in that: The inner wall of the finished product silo (8) is provided with a polytetrafluoroethylene plate.

Images