Modified steel slag preparation tool for pavement base and modified steel slag preparation method

Abstract

The invention provides a modified steel slag preparation tool for a pavement base and a modified steel slag preparation method. The preparation tool comprises a conveying mechanism, a material box, a stirring device, a spraying device, a dipping box and a driving mechanism. Lap joint parts are arranged on the material box, at least one lap joint part is pivotally connected to the material box through a connecting piece, a baffle is arranged on the conveying mechanism, when the material box is driven to be close to the conveying mechanism, the lap joint parts are extruded by the baffle to enable the elastic piece to be compressed to store energy, and when the lap joint parts are separated from the baffle, the elastic piece releases energy to enable the material box to be in lap joint to the conveying mechanism; when the material box is immersed in the dipping box, the lap joint part is extruded by the dipping box to be in a contraction state. A heating ventilation part is further arranged between the conveying mechanism and the dipping box, and the driving mechanism can drive the material box to stop at the heating ventilation part and is used for drying the dipped aggregate. Stirring can be carried out while spraying is carried out, the outer layer of aggregate can be evenly sprayed to make contact with a modifier, and the forming effect of a modified layer is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of steel slag preparation, and in particular to a modified steel slag preparation tool for a road base, and also to a preparation method of the modified steel slag for a road base. Background Art

[0002] Steel slag has good physical and mechanical properties, and its application in highway base can greatly improve its performance. In existing studies, adding a certain amount of microsilica fume to new steel slag and adding it to the water-stabilized crushed stone base has been found to improve its mechanical properties. However, cement dosage, steel slag composition, soil type, and curing age are the main factors affecting the performance of cement-stabilized bases. The flexural tensile strength of cement-stabilized steel slag crushed stone is the main factor affecting its fatigue life, and is mainly affected by the amount of steel slag and cement dosage.

[0003] Therefore, steel slag modification is used to replace natural crushed stone for water-stable base, and the road performance of water-stable crushed stone, water-stable steel slag, and water-stable modified steel slag mixture is considered. In the prior art, the pores on the surface of steel slag are filled with a modifier to make the surface flat and reduce the water absorption rate of unmodified steel slag. However, it has been found through experiments that an overly dense and flat surface will be detrimental to the interaction between steel slag and cementitious materials, and may weaken the interlocking ability between steel slag, resulting in insufficient stability of the internal structure of steel slag.

[0004] The reason for this phenomenon can be attributed to the existing modification treatment method of steel slag, that is, firstly using mechanical mixing method, solution spray method or immersion method to make the steel slag fully contact with the modifier, and then air-drying the steel slag to obtain surface-modified steel slag. However, during the air-drying and ventilation film-forming process, a large amount of modification solvent leaves the surface of the steel slag by flowing, dripping, etc., affecting the modification effect of the steel slag.

[0005] On the other hand, during the modification process, the surface of the slag is gradually wrapped by the calcium silicate hydrate (CSH) gel generated by the hydration reaction of the modifier and the slag. When the hydration reaction rate of the slag is faster than the film-forming speed of the modifier, the volume of the gel accumulated on the surface of the slag increases, resulting in cracks on the surface of the modified layer. Summary of the invention

[0006] In view of this, the present invention aims to propose a modified steel slag preparation tool for road base, so that the steel slag can have a better modified layer, and can effectively reduce the probability of cracks in the modified layer, thereby improving the steel slag modification effect.

[0007] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0008] A modified steel slag preparation tool for a road base layer, comprising a transmission mechanism, a material box arranged on the transmission mechanism, a stirring device for stirring the steel slag, a spraying device arranged above the material box, an impregnation box arranged below the transmission mechanism, and a driving mechanism for driving the material box to reciprocate between the transmission mechanism and the impregnation box;

[0009] The material box is provided with an overlapping portion, at least one of the overlapping portions is pivotally connected to the material box through a connecting member, the transmission mechanism is provided with a baffle, and the connecting member is provided with an elastic member abutting between the material box and the overlapping portion. When the material box is driven close to the transmission mechanism, the overlapping portion is squeezed by the baffle so that the elastic member is compressed and stores energy, and when the overlapping portion is separated from the baffle, the elastic member releases energy so that the material box overlaps the transmission mechanism; when the material box is immersed in the impregnation box, the overlapping portion is squeezed by the impregnation box and is in a contracted state;

[0010] A heating and ventilation portion is further provided between the transmission mechanism and the impregnation box, and the driving mechanism can drive the material box to stop at the heating and ventilation portion to dry the steel slag after impregnation.

[0011] Furthermore, the preparation tool also includes a seat body and an upper bracket;

[0012] The transmission mechanism includes a first driving part connected to the seat body, a driving roller and a driven roller pivotally connected to the seat body, a driving wheel sleeved on the driving roller, a driven wheel sleeved on the driven roller, and a conveyor belt drivingly connected to the driving wheel and the driven wheel;

[0013] The active roller and the driven roller are respectively arranged at two ends of the seat body, and the power output end of the first driving part is connected to the active roller to drive the conveyor belt to transmit;

[0014] The material box is overlapped on the conveyor belt through the overlap portion;

[0015] The baffle extends from the seat to one end of the material box, and part of the baffle passes through the conveyor belt. The baffle has an external leakage portion. When the material box is driven to move downward, the overlapping portion presses against the external leakage portion to compress the elastic member to store energy.

[0016] Further, the stirring device includes a second driving part connected to the upper bracket, a rotating shaft connected to the power output end of the second driving part, a third driving part transmission-connected to the rotating shaft, and a stirring part provided at the power output end of the third driving part;

[0017] The third driving portion drives the stirring portion to rotate, the second driving portion drives the rotating shaft to rotate, and the third driving portion moves along an arrangement direction of the rotating shaft.

[0018] Furthermore, the stirring part includes a spiral shaft, and at least two stirring heads connected below the spiral shaft, and the two stirring heads are staggered in height direction;

[0019] A spiral sleeve is provided at the power output end of the third driving part, and a ball is provided between the spiral sleeve and the spiral shaft. When the spiral sleeve rotates, the spiral shaft rotates and moves downward, and the stirring head abuts against the steel slag.

[0020] Further, the driving mechanism includes a fourth driving part, and a suction cup connected to the power output end of the fourth driving part, a vacuum chamber is provided in the suction cup, and the vacuum chamber is connected to the vacuum emitter;

[0021] The power output end of the fourth driving part passes through the impregnation tank and extends toward the material box.

[0022] Furthermore, the fourth driving unit adopts a two-stage oil cylinder, and a linear bearing is provided between the immersion box and the first-stage piston rod of the fourth driving unit.

[0023] Furthermore, the material box includes a bottom plate and a surrounding plate surrounding the bottom plate, the bottom plate adopts a flat plate structure, and the surrounding plate adopts a screen structure.

[0024] Further, the spray device comprises a plurality of rotating rods pivotally connected to the upper bracket, a spray pipe hinged to one end of the rotating rod, and a plurality of spray heads connected to the spray pipe;

[0025] A fifth driving unit is provided at one end of the spraying pipe, and the fifth driving unit is used to drive the spraying pipe to move back and forth, and the moving direction of the spraying pipe is perpendicular to the conveying direction of the material box;

[0026] The other end of the spray pipe is connected to the liquid storage tank;

[0027] The spray device is arranged at the entrance of the material box and is located above the impregnation box.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] The modified steel slag preparation tool for the road base of the present invention is provided with a spraying device so that the steel slag in the material box can be sprayed and soaked first, and the outer layer of the steel slag is wrapped before impregnation, and a stirring device is provided so that the outer layer of the steel slag can be stirred while spraying, so that the outer layer of the steel slag can be sprayed and contacted with the modifier evenly, thereby avoiding the phenomenon that the modified layer in the transition zone from the surface of the steel slag to the cross section has tiny pores caused by direct immersion in the prior art, and the tiny pores contact with water and cause the steel slag to break inside, thereby improving the molding effect of the modified layer. Then, the sprayed steel slag is immersed by providing a driving mechanism and an impregnation box to further form a stable modified layer.

[0030] In addition, the driving mechanism drives the material box to stay in the heating and ventilation part, which can increase the drying time of the slag and reduce the inter-slag squeezing capacity caused by the flowing and dripping modifier leaving the slag surface, thereby ensuring the stability of the internal structure of the slag. In addition, the driving mechanism can also drive the material box to move up and down during the soaking process to promote the slag in the middle to fully contact the modifier and improve the modification effect.

[0031] In addition, the material box is provided with an overlapped portion overlapped on the transmission mechanism, and the elastic member is in a free state, so that the material box can be mixed and sprayed while being transported, thereby realizing the pre-spraying process. And after spraying, it is driven to move downward, and the energy storage overlapped portion of the elastic member is in a compressed state, thereby realizing the slag soaking process. This setting is simple and easy to implement, and reduces the cost of the preparation tooling.

[0032] Another object of the present invention is to provide a method for preparing modified steel slag, which is prepared by using the modified steel slag preparation tool for road base as described above, and comprises the following steps:

[0033] Step 1: Preparation: Put a certain concentration of potassium methyl silicate solution modifier into the impregnation box and the liquid storage tank, and select a certain mass of steel slag and set it in the material box;

[0034] Step 2: spraying: using a spraying device to spray the steel slag in the material box, and starting the stirring device and the transmission mechanism at the same time, so that the steel slag is stirred and sprayed while being transported, so that the potassium methyl silicate solution modifier completely covers the steel slag;

[0035] Step three, soaking, the material box is driven downward by the driving mechanism, the overlapping part is in a contracted state due to abutting against the baffle, and the material box enters the impregnation box with the driving mechanism for soaking for a predetermined time;

[0036] Step 4: After the soaking reaches a predetermined time, the driving mechanism drives the material box to move upward to the heating and ventilation part for drying to obtain modified steel slag.

[0037] Furthermore, in step 1, the concentration of the potassium methyl silicate solution is 3wt%, and the diameter of the steel slag is 4.75mm to 9.5mm;

[0038] In step 3, the soaking time is 12 hours;

[0039] In step 4, the drying time is 5-7 hours.

[0040] The preparation method of the modified steel slag described in the present invention arranges a spraying process before the soaking process, so that the steel slag can wrap the modifier in the outer layer of the steel slag through stirring and spraying before soaking. In this way, the tiny pores can also be sprayed and wrapped by the modifier through the friction of stirring, avoiding the defects of the steel slag having too high water absorption rate and low hydrophobicity, thereby improving the road performance of the modified steel slag.

[0041] Through the test, the concentration of potassium methyl silicate solution is set to 3wt%, and the diameter of the aggregate is 4.75mm-9.5mm. In step three, the soaking time is 12h. In step four, the drying time is 5-7h. The water absorption rate of steel slag is reduced to the minimum, and the best effect of steel slag on improving the strength of the mixture is obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0043] Figure 1 This is a schematic front view of a tool for preparing modified steel slag for a road base according to Example Y-1 of the present invention;

[0044] Figure 2 for Figure 1 Schematic cross-sectional view at AA in the middle;

[0045] Figure 3 for Figure 1 A schematic cross-sectional view of the middle BB;

[0046] Figure 4 for Figure 1 A partial enlarged view of point I in the middle;

[0047] Figure 5 It is a schematic diagram of the cross-sectional connection structure of the overlapping portion and the material box described in the first embodiment of the present invention.

[0048] Description of reference numerals:

[0049] 1. Transmission mechanism; 2. Material box; 3. Stirring device; 4. Spraying device; 5. Dipping box; 6. Driving mechanism; 7. Overlapping part; 8. Baffle; 9. Elastic part; 10. Heating and ventilation part; 11. Base; 12. Upper bracket; 13. Connecting part;

[0050] 101, first driving unit; 102, driving roller; 103, driven roller; 104, conveyor belt;

[0051] 301, second driving unit; 302, rotating shaft; 303, third driving unit; 304, stirring unit;

[0052] 401, rotating rod; 402, spraying pipe; 403, spray head; 404, fifth driving unit;

[0053] 601, fourth driving unit; 602, suction cup; 603, linear bearing;

[0054] 801, leaking parts;

[0055] 3041, spiral shaft; 3042, stirring head; 3042, spiral sleeve;

[0056] 1101. Support plate. DETAILED DESCRIPTION

[0057] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0058] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "back", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0059] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installed", "connected", "connected", and "connector" 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 the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0060] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0061] Embodiment 1

[0062] The present embodiment relates to a modified steel slag preparation tool for a road base, which includes a transmission mechanism 1, a material box 2 arranged on the transmission mechanism 1, a stirring device 3 for stirring aggregates, a spraying device 4 arranged above the material box 2, an impregnation box 5 arranged below the transmission mechanism 1, and a driving mechanism 6 for driving the material box 2 to reciprocate between the transmission mechanism 1 and the impregnation box 5.

[0063] Among them, the material box 2 is provided with an overlap portion 7, at least one overlap portion 7 is pivotally connected to the material box 2 through a connecting member 13, the transmission mechanism 1 is provided with a baffle 8, and the connecting member 13 is provided with an elastic member 9 abutting between the material box 2 and the overlap portion 7. When the material box 2 is driven close to the transmission mechanism 1, the overlap portion 7 is squeezed by the baffle 8 to compress the elastic member 9 to store energy, and when the overlap portion 7 is separated from the baffle 8, the elastic member 9 releases energy to make the material box 2 overlap the transmission mechanism 1; when the material box 2 is immersed in the impregnation box 5, the overlap portion 7 is squeezed by the impregnation box 5 and is in a contracted state. A heating and ventilation portion 10 is also provided between the transmission mechanism 1 and the impregnation box 5, and the driving mechanism 6 can drive the material box 2 to stop at the heating and ventilation portion 10, which is used to dry the aggregate after impregnation.

[0064] The modified steel slag preparation tool for the road base of this embodiment is provided with a spraying device 4 so that the aggregate in the material box 2 can be sprayed and soaked first, and the outer layer of the aggregate is wrapped before impregnation, and the stirring device 3 can be provided to stir while spraying, so that the outer layer of the aggregate can be sprayed and contacted with the modifier evenly, avoiding the phenomenon that the modified layer from the steel slag surface to the cross-section transition zone caused by direct immersion in the prior art has tiny pores, and the tiny pores contact with water and cause the steel slag to break inside, thereby improving the molding effect of the modified layer. Then, the sprayed aggregate is immersed by providing a driving mechanism 6 and an impregnation box 5, and a stable modified layer is further formed.

[0065] In addition, the material box 2 is driven to stay in the heating and ventilation part 10 by the driving mechanism 6, which can increase the drying time of the slag and reduce the inter-slag squeezing capacity caused by the flowing and dripping modifier leaving the surface of the slag, thereby ensuring the stability of the internal structure of the slag. In addition, the driving mechanism 6 can also drive the material box 2 to move up and down during the soaking process to promote the slag in the middle to fully contact the modifier and improve the modification effect.

[0066] Based on the above overall introduction, an exemplary structure of a tooling for preparing modified steel slag for a road base layer in this embodiment is as follows: Figures 1 to 5As shown, the connector 13 of this embodiment uses two hinges to connect the overlap portion 7 to the material box 2. The overlap portion 7 is formed into a flat plate structure, and the overlap portion 7 is flush with the upper plane of the material box 2. One hinge is set on the overlap portion 7 and the upper plane of the material box 2, and the other hinge is set on the lower plane of the overlap portion 7 and the side of the material box 2. The two hinges are connected by a pin shaft, and the elastic member 9 is a torsion spring set on both sides of the pin shaft. The torsion springs of the two pin shafts store or release energy when the overlap portion 7 is folded upward or downward, respectively, so that the overlap portion 7 can rebound to a state parallel to the material box 2 after the material box 2 moves up or down. The elastic force of the torsion spring is calculated according to the weight of the steel slag in the material box 2, which will not be repeated here.

[0067] As a preferred embodiment, Figures 1 to 3 As shown, the preparation tool also includes a base body 11 and an upper bracket 12. The transmission mechanism 1 includes a first driving part 101 connected to the base body 11, an active roller 102 and a driven roller 103 pivotally connected to the base body 11, a driving wheel sleeved on the active roller 102, a driven wheel sleeved on the driven roller 103, and a conveyor belt 104 drivingly connected to the active wheel and the driven wheel. The active roller 102 and the driven roller 103 are respectively arranged at both ends of the base body 11, and the power output end of the first driving part 101 is connected to the active roller 102 to drive the conveyor belt 104 to transmit.

[0068] like Figure 1 and Figure 2 As shown, the first driving part 101 adopts a servo motor, and the speed of the servo motor needs to be adapted to the working rhythm of the stirring device 3 to ensure that the slag in the material box 2 can be stirred and sprayed. The upper bracket 12 is formed by welding and fixing a plurality of rectangular tubes. The seat body 11 is formed by a steel plate with an inner cavity. The bottom of the impregnation box 5 is provided with a support plate 1101 fixed to the side of the seat body 11, and the two impregnation boxes 5 are respectively arranged on the support plate 1101.

[0069] The number of impregnation boxes 5 and material boxes 2 corresponds to each other. In this embodiment, two material boxes 2 and impregnation boxes 5 are provided to adapt to the modification of steel slag in different diameter ranges. Since the modification of steel slag in different diameter ranges is different, they can be implemented together. Of course, when steel slag in multiple diameter ranges needs to be modified, adaptive adjustments can be made, which will not be repeated here.

[0070] Among them, the material box 2 is overlapped on the conveyor belt 104 through the overlap portion 7, the baffle 8 extends from the seat body 11 to one end of the material box 2, and part of the baffle 8 passes through the conveyor belt. The baffle 8 has an external leakage portion 801. When the material box 2 is driven to move downward, the overlap portion 7 presses against the external leakage portion 801 to compress the elastic member 9 to store energy.

[0071] In this embodiment, the material box 2 is provided with a lapped portion 7 which is overlapped on the transmission mechanism 1, and the elastic member 9 is in a free state, so that the material box 2 can be mixed and sprayed while being transported, thereby realizing the pre-spraying process. After spraying, the elastic member 9 is driven to move downward, and the energy storage lapped portion 7 of the elastic member 9 is in a compressed state, thereby realizing the slag soaking process. This setting is simple and easy to implement, and reduces the cost of the preparation tooling.

[0072] In addition, by setting up the preparation tooling, the automated assembly line processing of the steel slag modification can be realized, avoiding the transportation of the steel slag to multiple devices for circulation, reducing the circulation process of the steel slag modification process, and improving the production efficiency of the steel slag modification.

[0073] Preferably, if Figures 1 to 3 As shown, the stirring device 3 includes a second driving part 301 connected to the upper bracket 12, a rotating shaft 302 connected to the power output end of the second driving part 301, a third driving part 303 drivingly connected to the rotating shaft 302, and a stirring part 304 arranged at the power output end of the third driving part 303. The third driving part 303 drives the stirring part 304 to rotate, the second driving part 301 drives the rotating shaft 302 to rotate, and the third driving part 303 moves along the arrangement direction of the rotating shaft 302.

[0074] In this embodiment, the second driving part 301 and the third driving part 303 both adopt rotating motors. The mounting end of the third driving part 303 is provided with a threaded hole, and the outer surface of the rotating shaft 302 is provided with a thread. Since the gravity of the third driving part 303 and the stirring part 304 is greater than the friction between the threaded rotating shaft 302 and the threaded hole, the third driving part 303 reciprocates along the length direction of the rotating shaft 302. Such an arrangement enables the stirring part 304 to stir along the width direction of the material box 2.

[0075] More specifically, the stirring portion 304 of this embodiment includes a spiral shaft 3041, at least two stirring heads 3042 connected below the spiral shaft 3041, the two stirring heads 3042 are staggered in the height direction, and a spiral sleeve 3042 is provided at the power output end of the third driving portion 303, and a ball is provided between the spiral sleeve 3042 and the spiral shaft 3041. When the spiral sleeve 3042 rotates, the spiral shaft 3041 rotates and moves downward at the same time, and the stirring head 3042 abuts against the aggregate.

[0076] like Figure 3As shown, the stirring part 304 of this embodiment also includes a connecting plate connected to one end of the spiral shaft 3041, and a plurality of connecting rods are evenly distributed on the circumference of the connecting plate. A stirring head 3042 is provided at the end of the connecting rod. The stirring head 3042 of this embodiment is a stirring plate and a steel column connected to the stirring plate. Two adjacent connecting rods are of different lengths so that the stirring head 3042 can stir the deep and shallow steel slag. Of course, the material box 2 and the stirring part 304 of this embodiment are for illustration only. For steel slag that needs to be prepared in large quantities, the depth and area of ​​the material box 2 are larger, and the length of the connecting rod and the length of the steel column are adaptively adjusted according to the amount of steel slag, and are not limited here.

[0077] Preferably, if Figures 1 to 3 As shown, the driving mechanism 6 includes a fourth driving part 601, and a suction cup 602 connected to the power output end of the fourth driving part 601, a vacuum chamber is provided in the suction cup 602, and the vacuum chamber is connected to the vacuum emitter. The power output end of the fourth driving part 601 extends through the impregnation box 5 to the material box 2. The fourth driving part 601 of this embodiment adopts a two-stage oil cylinder, and a linear bearing 603 is provided between the impregnation box 5 and the first-stage piston rod of the fourth driving part 601. The linear bearing 603 of this embodiment adopts a waterproof structure.

[0078] The suction cup 602 is provided with a plurality of through holes connecting the vacuum chamber and the outside. When the suction cup 602 abuts against the bottom of the material box 2, the vacuum emitter draws a vacuum so that the suction cup 602 and the bottom plate are fixed by suction, and the fourth driving part 601 drives the material box 2 to move along the height direction of the base.

[0079] Preferably, the heating and ventilation part 10 of this embodiment includes a heating part and a ventilation part arranged on the side wall of the seat body 11. The heating part adopts, for example, a heating lamp, and the ventilation part is connected to an external ventilation device, and an air conditioning device or an air pump capable of heating can be adopted.

[0080] In addition, if Figures 1 to 3 As shown, the spray device 4 includes a plurality of rotating rods 401 pivotally connected to the upper bracket 12, a spray pipe 402 hinged at one end of the rotating rod 401, and a plurality of spray heads 403 connected to the spray pipe 402. A fifth driving part 404 is provided at one end of the spray pipe 402, and the fifth driving part 404 is used to drive the spray pipe 402 to move back and forth, and the moving direction of the spray pipe 402 is perpendicular to the conveying direction of the material box 2. The other end of the spray pipe 402 is connected to the liquid storage tank. The spray device 4 is arranged at the entrance of the material box 2 and is located above the impregnation box 5.

[0081] Specifically, the fifth driving unit 404 uses a telescopic cylinder, and the modifier is placed in the liquid storage tank. The fifth driving unit 404 drives each nozzle 403 to move back and forth to spray the steel slag, thereby forming a modified layer on the surface of the steel slag. The material box 2 moves with the transmission mechanism 1, and the modifier can act evenly on the steel slag through the combined action of the stirring device 3 and the spraying device.

[0082] As a specific implementation, the material box 2 includes a bottom plate and a surrounding plate surrounding the bottom plate, the bottom plate adopts a flat plate structure, and the surrounding plate adopts a screen structure. The modifier passing through the spray device 4 can flow out through the pores of the surrounding plate and flow into the impregnation box 5, without causing waste of the modifier.

[0083] Embodiment 2

[0084] This embodiment relates to a method for preparing modified steel slag, which is prepared by using the modified steel slag preparation tool for road base as described in the first embodiment, and is characterized in that:

[0085] Step 1: Preparation: put a certain concentration of potassium methyl silicate solution modifier into the impregnation box 5 and the liquid storage tank, and select a certain mass of aggregate to be placed in the material box 2;

[0086] Step 2: spraying: spray the aggregate in the material box 2 with the spray device 4, and start the stirring device 3 and the transmission mechanism 1 at the same time, so that the aggregate is stirred and sprayed while being transported, so that the potassium methyl silicate solution modifier completely covers the aggregate;

[0087] Step 3: Soaking: the driving mechanism 6 drives the material box 2 downward, the overlapping portion 7 is in a contracted state due to abutting against the baffle 8, and the material box 2 enters the impregnation box 5 with the driving mechanism 6 for soaking for a predetermined time;

[0088] Step 4: After the soaking reaches a predetermined time, the driving mechanism 6 drives the material box 2 to move upward to the heating and ventilation part 10 for drying to obtain modified steel slag.

[0089] Furthermore, through the preparation method of the modified steel slag of this embodiment, samples were selected for testing and research on water absorption, hydrophobicity, water erosion resistance, water swelling rate, etc. Preferably, in step 1, the concentration of potassium methyl silicate solution is 3wt%, and the diameter of the aggregate is 4.75mm-9.5mm. In step 3, the soaking time is 12h. In step 4, the drying time is 5-7h.

[0090] Since there are many tiny pores on the surface of steel slag, these pores are one of the reasons why the steel slag has strong water absorption capacity and poor volume stability. The preparation method of the modified steel slag in this embodiment arranges a spraying process before the soaking process, so that the steel slag can wrap the modifier in the outer layer of the steel slag through stirring and spraying before soaking. In this way, the tiny pores can also be sprayed and wrapped by the modifier through the friction of stirring, avoiding the defects of too high water absorption rate and low hydrophobicity of the steel slag, thereby improving the road performance of the modified steel slag.

[0091] Through the test, the concentration of potassium methyl silicate solution is set to 3wt%, and the diameter of the aggregate is 4.75mm-9.5mm. In step three, the soaking time is 12h. In step four, the drying time is 5-7h. The water absorption rate of steel slag is reduced to the minimum, and the best effect of steel slag on improving the strength of the mixture is obtained.

[0092] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A tool for preparing modified steel slag for road base, characterized in that: The invention comprises a conveying mechanism (1), a material box (2) arranged on the conveying mechanism (1), a stirring device (3) for stirring steel slag, a spraying device (4) arranged above the material box (2), an impregnation box (5) arranged below the conveying mechanism (1), and a driving mechanism (6) for driving the material box (2) to reciprocate between the conveying mechanism (1) and the impregnation box (5); The material box (2) is provided with an overlap portion (7), at least one of the overlap portions (7) is pivotally connected to the material box (2) via a connecting member (13), the transmission mechanism (1) is provided with a baffle (8), the connecting member (13) is provided with an elastic member (9) abutting between the material box (2) and the overlap portion (7), when the material box (2) is driven close to the transmission mechanism (1), the overlap portion (7) is squeezed by the baffle (8) so that the elastic member (9) is compressed and stores energy, when the overlap portion (7) is separated from the baffle (8), the elastic member (9) releases energy so that the material box (2) overlaps the transmission mechanism (1); when the material box (2) is immersed in the immersion box (5), the overlap portion (7) is squeezed by the immersion box (5) and is in a contracted state; A heating and ventilation section (10) is also provided between the transmission mechanism (1) and the impregnation box (5), and the driving mechanism (6) can drive the material box (2) to stop at the heating and ventilation section (10) to dry the steel slag after impregnation.

2. The modified steel slag preparation tool for road base according to claim 1, characterized in that: The preparation tool also includes a seat body (11) and an upper bracket (12); The transmission mechanism (1) comprises a first driving part (101) connected to the base body (11), a driving roller (102) and a driven roller (103) pivotally connected to the base body (11), a driving wheel sleeved on the driving roller (102), a driven wheel sleeved on the driven roller (103), and a conveyor belt (104) drivingly connected to the driving wheel and the driven wheel; The active roller (102) and the driven roller (103) are respectively arranged at two ends of the seat body (11); the power output end of the first driving part (101) is connected to the active roller (102) to drive the conveyor belt (104) to transmit; The material box (2) is overlapped above the conveyor belt (104) via the overlap portion (7); The baffle (8) extends from the seat (11) to one end of the material box (2), and a portion of the baffle (8) passes through the conveyor belt. The baffle (8) has an external leakage portion (801). When the material box (2) is driven to move downward, the overlapping portion (7) presses against the external leakage portion (801) to compress the elastic member (9) to store energy.

3. The modified steel slag preparation tool for road base according to claim 2, characterized in that: The stirring device (3) comprises a second driving part (301) connected to the upper bracket (12), a rotating shaft (302) connected to the power output end of the second driving part (301), a third driving part (303) transmission-connected to the rotating shaft (302), and a stirring part (304) provided at the power output end of the third driving part (303); The third driving part (303) drives the stirring part (304) to rotate, the second driving part (301) drives the rotating shaft (302) to rotate, and the third driving part (303) moves along the arrangement direction of the rotating shaft (302).

4. The modified steel slag preparation tool for road base according to claim 3, characterized in that: The stirring portion (304) comprises a spiral shaft (3041), and at least two stirring heads (3042) connected below the spiral shaft (3041), wherein the two stirring heads (3042) are staggered in height direction; A spiral sleeve (3042) is provided at the power output end of the third driving part (303), and a ball bearing is provided between the spiral sleeve (3042) and the spiral shaft (3041). When the spiral sleeve (3042) rotates, the spiral shaft (3041) rotates and moves downward, and the stirring head (3042) abuts against the steel slag.

5. The modified steel slag preparation tool for road base according to claim 1, characterized in that: The driving mechanism (6) comprises a fourth driving part (601), and a suction cup (602) connected to a power output end of the fourth driving part (601), wherein a vacuum cavity is provided in the suction cup (602), and the vacuum cavity is connected to a vacuum emitter; The power output end of the fourth driving part (601) passes through the impregnation tank (5) and extends toward the material box (2).

6. The modified steel slag preparation tool for road base according to claim 5, characterized in that: The fourth driving part (601) adopts a double-stage oil cylinder, and a linear bearing (603) is provided between the dipping box (5) and the primary piston rod of the fourth driving part (601).

7. The tooling for preparing modified steel slag for road base according to claim 5, characterized in that: The material box (2) comprises a bottom plate and a surrounding plate surrounding the bottom plate, the bottom plate adopts a flat plate structure, and the surrounding plate adopts a screen structure.

8. The modified steel slag preparation tool for road base according to claim 2, characterized in that: The spray device (4) comprises a plurality of rotating rods (401) pivotally connected to the upper bracket (12), a spray pipe (402) hinged to one end of the rotating rod (401), and a plurality of spray heads (403) connected to the spray pipe (402); A fifth driving unit (404) is provided at one end of the spraying pipe (402), and the fifth driving unit (404) is used to drive the spraying pipe (402) to move back and forth, and the moving direction of the spraying pipe (402) is perpendicular to the conveying direction of the material box (2); The other end of the spray pipe (402) is connected to the liquid storage tank; The spray device (4) is arranged at the entrance of the material box (2) and is located above the impregnation box (5).

9. A method for preparing modified steel slag, using the modified steel slag preparation tool for road base according to any one of claims 1 to 8, characterized in that: Step 1: Preparation: Put a potassium methyl silicate solution modifier of a certain concentration into the impregnation box (5) and the liquid storage tank, and select a certain mass of steel slag and place it in the material box (2); Step 2: spraying, using a spraying device (4) to spray the steel slag in the material box (2), and simultaneously starting the stirring device (3) and the transmission mechanism (1) to stir and spray the steel slag while transmitting, so that the potassium methyl silicate solution modifier completely covers the steel slag; Step three, soaking, the driving mechanism (6) drives the material box (2) to move downward, the overlapping portion (7) is in a contracted state due to abutment against the baffle (8), and the material box (2) enters the dipping box (5) along with the driving mechanism (6) to be soaked for a predetermined time; Step 4: After the soaking reaches a predetermined time, the driving mechanism (6) drives the material box (2) to move upward to the heating and ventilation part (10) for drying to obtain modified steel slag.

10. The method for preparing modified steel slag according to claim 9, characterized in that: In step 1, the concentration of the potassium methyl silicate solution is 3wt%, and the diameter of the steel slag is 4.75mm-9.5mm; In step 3, the soaking time is 12 hours; In step 4, the drying time is 5-7 hours.

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