A hazardous waste-containing sludge solidification mixing apparatus

Abstract

The application discloses a sludge solidification mixing device containing hazardous waste, which comprises a stirring box and two stirring shafts located in the stirring box, a rotating cylinder of the stirring shaft is respectively rotationally connected with a first stirring blade, a second stirring blade, a third stirring blade and a fourth stirring blade, coaxial first adjusting rods, second adjusting rods, third adjusting rods and fourth adjusting rods are arranged in the rotating cylinder, the first stirring blade is connected with the first adjusting rod through a first connecting structure, the second stirring blade is connected with the second adjusting rod through a second connecting structure, the third stirring blade is connected with the third adjusting rod through a third connecting structure, and the fourth stirring blade is connected with the fourth adjusting rod through a fourth connecting structure; the angle of the stirring blade can be changed by moving the adjusting rod; the stirring blade on the stirring shaft of the sludge solidification mixing device can be adjusted in angle to form different stirring modes, and the stirring demand of different sludge-solidification agent systems can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hazardous waste treatment equipment, and particularly relates to a sludge solidification mixing device containing hazardous waste. BACKGROUND

[0002] Sludge treatment containing hazardous waste is an important part of industrial pollution control, mainly involving electroplating sludge, chemical sludge, heavy metal-containing sludge, oil-containing sludge and other types. These sludges are complex in composition and have environmental risks, and solidification and filling are common treatment methods.

[0003] In the process flow, the sludge is first subjected to mechanical dewatering by a plate and frame filter press or a diaphragm filter press to reduce the water content from more than 80% to about 50%. The dewatered sludge is semi-solid and needs to be mixed with a solidifying agent to form a stable solidified body. Common solidifying agents include silicate cement, sulphoaluminate cement, lime, fly ash and other inorganic materials, as well as phosphate, organic polymer and other chemical agents. Different types of sludge need to be matched with specific solidifying agent systems: for example, electroplating sludge is suitable for a cement-fly ash composite system, oil-containing sludge needs to add a hydrophobic polymer, and chromium-containing sludge needs to be used with a reducing agent.

[0004] Different sludge-solidifying agent systems have different requirements for mixing, such as high-viscosity sludge (such as oil-containing sludge) which needs strong shear force to break the agglomerate structure, while heavy metal-containing fine powder sludge needs gentle stirring, cement-based solidifying agents require low-speed long-time stirring to ensure hydration reaction, and polymer solidifying agents need high-speed short-time mixing to achieve rapid dispersion. At present, the industry generally uses a double-shaft stirring device to stir and mix the sludge and the solidifying agent. The stirring blade is of a fixed structure and can only provide a single direction of shear mixing. This single stirring mode is difficult to adapt to the mixing requirements of different sludge-solidifying agent systems, which can easily lead to uneven mixing, insufficient strength of the solidified body and other problems. SUMMARY

[0005] The present application is a sludge solidification mixing device containing hazardous waste, which is proposed to solve the problem that the single stirring mode of the double-shaft stirring device in the prior art is difficult to adapt to the mixing requirements of different sludge-solidifying agent systems. The stirring blade of the double-shaft stirring device is designed to be movable, and the stirring mode is increased to adapt to different mixing requirements.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] The application discloses a hazardous waste-containing sludge solidification mixing device, which comprises a stirring box and two stirring shafts arranged in the stirring box, wherein a plurality of stirring blades are arranged on the stirring shafts, the stirring shafts comprise rotating cylinders which are rotationally connected with the stirring box at two ends, and the rotating cylinders are respectively rotationally connected with first stirring blades, second stirring blades, third stirring blades and fourth stirring blades, the stirring blades on the same radial plane form a stirring group, and a plurality of stirring groups are uniformly arranged along the axial direction of the rotating cylinder; the stirring group formed by the first stirring blades is arranged in a spaced mode with the stirring group formed by the second stirring blades, and the stirring group formed by the third stirring blades is arranged in a spaced mode with the stirring group formed by the fourth stirring blades.

[0008] A plurality of connecting structures and coaxial first adjusting rods, second adjusting rods, third adjusting rods and fourth adjusting rods are arranged in the rotating cylinder, the connecting structures are used for converting the displacement of the adjusting rods into the angle change of the stirring blades, the first adjusting rods and the second adjusting rods are arranged on the feeding side of the stirring box, the second adjusting rods are axially slidably connected with the first adjusting rods, the first stirring blades are connected with the first adjusting rods through first connecting structures, and the second stirring blades are connected with the second adjusting rods through second connecting structures; the third adjusting rods and the fourth adjusting rods are arranged on the discharging side of the stirring box, the fourth adjusting rods are axially slidably connected with the third adjusting rods, the third stirring blades are connected with the third adjusting rods through third connecting structures, and the fourth stirring blades are connected with the fourth adjusting rods through fourth connecting structures.

[0009] Preferably, the connecting structure comprises a connecting sleeve, an extension rod, a connecting base and a connecting rod, the connecting sleeve is fixedly sleeved on the rotating column of the stirring blade, the connecting sleeve and the connecting base are connected through the extension rod, the connecting base is rotationally connected with the first end of the connecting rod, and the second end of the connecting rod is fixedly connected with the adjusting rod.

[0010] Preferably, a plurality of mounting bases are fixedly arranged on the rotating cylinder, the positions and the number of the mounting bases correspond to the stirring blades, and the stirring blades are rotationally connected with the mounting bases through rotating columns.

[0011] Preferably, the axis of the connecting rod is arranged in parallel with the axis of the rotating column of the stirring blade, and the axis of the extension rod is perpendicular to the axis of the rotating column of the stirring blade.

[0012] Preferably, the device comprises a first function cylinder for driving the first adjusting rod to axially move, a second function cylinder for driving the second adjusting rod to axially move, a third function cylinder for driving the third adjusting rod to axially move and a fourth function cylinder for driving the fourth adjusting rod to axially move.

[0013] Preferably, the first function cylinder and the second function cylinder are arranged on the feeding side of the stirring box, and the third function cylinder is arranged on the discharging side of the stirring box.

[0014] The two rotating barrels are respectively fixed with gears through sleeve connection at the extending ends of the two rotating barrels.

[0015] Preferably, a cover plate is arranged on the top of the stirring box, and a feeding port is arranged on the cover plate at the feeding end of the stirring box.

[0016] Preferably, a feeding pipe is arranged on the upper part of the stirring box.

[0017] Preferably, a discharging port is arranged at the bottom of the discharging end of the stirring box.

[0018] The present application has the following advantages:

[0019] 1. The sludge solidification mixing device is used for treating sludge containing hazardous waste, and the sludge is stirred and mixed with a solidifying agent in the stirring box. The stirring blades on the stirring shaft in the stirring box can be angle-adjusted to form different stirring modes to adapt to the stirring requirements of different sludge-solidifying agent systems. Furthermore, the sludge and the solidifying agent can be mixed and conveyed in the stirring box to realize continuous and uninterrupted mixing and discharging, and the treatment efficiency is high.

[0020] 2. The stirring shaft of the sludge solidification mixing device is internally provided with an adjusting rod group. The adjusting rods in the adjusting rod group adjust the angles of the stirring blades by moving to realize different stirring angles of the adjacent stirring blades on the stirring shaft, and convection is formed in the mixing space to enhance the stirring effect and improve the mixing degree.

[0021] 3. The sludge solidification mixing device can perform sludge segmented treatment. The first adjusting rod group and the second adjusting rod group can respectively adjust the angles of the stirring blades of the corresponding conveying sections to realize combined stirring and mixing, and dynamic pre-curing can be performed after the sludge and the solidifying agent are mixed to adapt to different stirring requirements. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structure schematic view of the sludge solidification mixing device containing hazardous waste from the top view.

[0023] Figure 2 It is a structure schematic view of the stirring box of the sludge solidification mixing device containing hazardous waste.

[0024] Figure 3 It is a structure schematic view of the first stirring shaft of the sludge solidification mixing device containing hazardous waste.

[0025] Figure 4 It is a structure schematic view of the axial section of the first stirring blade of the sludge solidification mixing device containing hazardous waste.

[0026] Figure 5 It is a structure schematic view of the radial section of the first stirring blade of the sludge solidification mixing device containing hazardous waste.

[0027] Figure 6 Structure diagram of first coupling structure of the sludge solidification and mixing device containing hazardous waste;

[0028] Figure 7 Structure diagram of radial section of second stirring blade of the sludge solidification and mixing device containing hazardous waste;

[0029] Figure 8 Diagram of one-way conveying and stirring state of the sludge solidification and mixing device containing hazardous waste;

[0030] Figure 9 Diagram of single stirring state of the sludge solidification and mixing device containing hazardous waste;

[0031] Figure 10 Diagram of two-way differential conveying and stirring state of the sludge solidification and mixing device containing hazardous waste;

[0032] Figure 11 Diagram of segmented conveying and stirring state of the sludge solidification and mixing device containing hazardous waste.

[0033] In the figure: 1, stirring box; 2, first rotating cylinder; 3, first stirring blade; 4, second stirring blade; 5, first adjusting rod; 6, second adjusting rod; 7, first coupling structure; 8, second coupling structure; 9, second rotating cylinder; 10, mixing space; 11, first supporting sleeve; 12, third stirring blade; 13, fourth stirring blade; 14, third coupling structure; 15, fourth coupling structure; 16, third adjusting rod; 17, fourth adjusting rod; 18, second supporting sleeve; 19, first function cylinder; 20, second function cylinder; 21, first support; 22, third function cylinder; 23, fourth function cylinder; 24, second support; 25, mixing motor; 26, third gear;

[0034] 101, cover plate; 102, feeding pipe; 201, mounting seat; 202, first gear; 31, rotating column; 51, first movable slot; 71, connecting sleeve; 72, telescopic rod; 73, connecting seat; 74, first connecting rod; 81, second connecting rod; 91, second gear; 161, second movable slot. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments.

[0036] Reference Figure 1 , Figure 2 and Figure 5The utility model provides a kind of sludge solidification mixing equipment containing hazardous waste, including stirring box 1, the inside of stirring box 1 is provided with two parallelly arranged stirring shafts, two stirring shafts include first stirring shaft and second stirring shaft, first stirring shaft and second stirring shaft are respectively rotationally connected with stirring box 1.Stirring shaft is provided with stirring blade, and stirring blade is used to stir sludge in the inside of stirring box 1, and mixing space 10 is formed in the inside of stirring box 1.

[0037] In the embodiment, the first stirring shaft includes a first rotating cylinder 2, the two ends of which are rotationally connected with the stirring box 1. A plurality of stirring blades are rotationally connected to the first rotating cylinder 2. A plurality of mounting seats 201 are fixedly arranged on the first rotating cylinder 2, which are fixedly connected to the first rotating cylinder 2 by bolts. The positions and numbers of the mounting seats 201 correspond to those of the stirring blades, and the mounting seats 201 are used to mount the stirring blades. The stirring blades include stirring parts and rotating columns 31, wherein the stirring parts are located outside the first rotating cylinder 2, and the rotating columns 31 penetrate the mounting seats 201 and are inserted into the first rotating cylinder 2. The rotating columns 31 are rotationally connected to the mounting seats 201.

[0038] Further, the stirring blades include first stirring blades 3, second stirring blades 4, third stirring blades 12, and fourth stirring blades 13. These stirring blades are uniformly arranged along the axial direction of the first rotating cylinder 2 and form four stirring groups respectively. A plurality of first stirring blades 3 are uniformly arranged on the same radial plane of the first rotating cylinder 2 to form a first stirring group. Similarly, a plurality of second stirring blades 4 are uniformly arranged on the same radial plane of the first rotating cylinder 2 to form a second stirring group, a plurality of third stirring blades 12 are uniformly arranged on the same radial plane of the first rotating cylinder 2 to form a third stirring group, and a plurality of fourth stirring blades 13 are uniformly arranged on the same radial plane of the first rotating cylinder 2 to form a fourth stirring group. Among them, the first stirring group and the second stirring group are located on the feeding side of the stirring box 1 and are axially spaced apart; the third stirring group and the fourth stirring group are located on the discharging side of the stirring box 1 and are also axially spaced apart.

[0039] Reference Figure 3 And Figure 4 The first rotating cylinder 2 is provided with a first adjusting rod group and a second adjusting rod group. The first adjusting rod group is located on the feeding side of the stirring box 1 and includes a first adjusting rod 5 and a second adjusting rod 6. The second adjusting rod group is located on the discharging side of the stirring box 1 and includes a third adjusting rod 16 and a fourth adjusting rod 17. The first adjusting rod 5, the second adjusting rod 6, the third adjusting rod 16, and the fourth adjusting rod 17 are coaxially arranged with the first rotating cylinder 2 and are axially slidably connected.

[0040] The first stirring group and the second stirring group extend along the corresponding shaft sections of the first adjusting rod group, and the first stirring blades 3 and the second stirring blades 4 are arranged in an axial interval of the first adjusting rod group. The first adjusting rod 5 of the first adjusting rod group is sleeved outside the second adjusting rod 6, and the second adjusting rod 6 is provided with a spline between the first adjusting rod 5. The second adjusting rod 6 is in axial sliding connection with the first adjusting rod 5, so that the second adjusting rod 6 can slide in the first adjusting rod 5 in the axial direction while keeping synchronous rotation with the first adjusting rod 5.

[0041] The first support sleeve 11 is fixedly arranged inside the first rotating cylinder 2, is sleeved outside the first adjusting rod 5, supports the first adjusting rod 5, and is provided with a linear bearing between the first adjusting rod 5, so as to form an axial sliding connection between the first support sleeve 11 and the first adjusting rod 5. Therefore, the first adjusting rod 5 can slide in the first support sleeve 11 in the axial direction while keeping synchronous rotation with the first rotating cylinder 2.

[0042] The first stirring blade 3 is connected with the first adjusting rod 5 through the first connecting structure 7. The first adjusting rod 5 can rotate the first stirring blade 3 by moving the rotating column 31 as the rotating shaft, so as to adjust the inclination angle with the radial surface and change the stirring intensity and the material flow direction.

[0043] The second stirring blade 4 is connected with the second adjusting rod 6 through the second connecting structure 8. The second adjusting rod 6 can rotate the second stirring blade 4 by moving the rotating column 31 as the rotating shaft, so as to adjust the inclination angle with the radial surface of the first rotating cylinder 2 and change the stirring intensity and the material flow direction.

[0044] Reference Figure 5 and Figure 6 The first connecting structure 7 includes a connecting sleeve 71, an extension rod 72, a connecting seat 73, and a first connecting rod 74. The connecting sleeve 71 is fixedly sleeved on the rotating column 31 of the first stirring blade 3. The connecting sleeve 71 is connected with the connecting seat 73 through the extension rod 72. The connecting seat 73 is rotationally connected to the first end of the first connecting rod 74. The second end of the first connecting rod 74 is fixedly connected to the first adjusting rod 5. The axis of the first connecting rod 74 is parallel to the axis of the rotating column 31 of the first stirring blade 3. The axes of the extension rod 72 are perpendicular to the axis of the rotating column 31 of the first stirring blade 3 and the axis of the first connecting rod 74, respectively.

[0045] When the first adjusting rod 5 moves axially relative to the first rotating cylinder 2, the first connecting rod 74 and the connecting seat 73 move with the first adjusting rod 5, the connecting seat 73 pulls one end of the telescopic rod 72 to move, and since the rotating column 31 does not move axially, the telescopic rod 72 will expand and rotate, thereby forming the rotation of the rotating column 31, that is, the radial rotation of the first stirring blade 3 relative to the first rotating cylinder 2 is realized, and the stirring angle of the first stirring blade 3 is changed.

[0046] The first connecting structure 7 and the second connecting structure 8 have the same structure, and the second connecting structure 8 will be described below. Figure 7 The second connecting rod 81 is fixedly connected to the second adjusting rod 6. In the embodiment, a plurality of first movable grooves 51 are arranged on the first adjusting rod 5, and the first movable grooves 51 are used to accommodate the second connecting rod 81. The first movable groove 51 is a long slot extending in the axial direction of the first adjusting rod 5, and the second connecting rod 81 can move axially in the first movable groove 51. When the second adjusting rod 6 moves axially relative to the first rotating cylinder 2, the second connecting rod 81 moves with the second adjusting rod 6, and the radial rotation of the second stirring blade 4 relative to the first rotating cylinder 2 is realized, and the stirring angle of the second stirring blade 4 is changed.

[0047] When the first stirring blade 3 and the second stirring blade 4 are in the initial position, the plane where the stirring part of the first stirring blade 3 and the second stirring blade 4 is perpendicular to the radial plane of the first rotating cylinder 2, at this time, the first adjusting rod 5 and the second adjusting rod 6 are also in the initial position. When the first adjusting rod 5 and the second adjusting rod 6 move axially relative to the first rotating cylinder 2, the first stirring blade 3 and the second stirring blade 4 rotate, and the plane where the stirring part of the first stirring blade 3 and the second stirring blade 4 has a certain angle relative to the radial plane of the first rotating cylinder 2, which is the stirring angle. When the first stirring blade 3 and the second stirring blade 4 have the stirring angle, the first stirring blade 3 and the second stirring blade 4 also have a pushing force on the sludge when rotating, that is, they have a sludge conveying function. For example, when the first stirring blade 3 and the first rotating cylinder 2 form a 30-degree angle, the first stirring blade 3 not only realizes sufficient stirring of the sludge in the rotating process, but also pushes the sludge axially, improving the mixing efficiency and conveying capacity.

[0048] When the first adjusting rod 5 and the second adjusting rod 6 have the same displacement distance and direction relative to the initial position, the stirring angles of the first stirring blade 3 and the second stirring blade 4 are the same, and the conveying directions of the first stirring blade 3 and the second stirring blade 4 are the same, which can form one-way conveying of the sludge. Figure 8

[0049] ​When the displacement distance of the first adjusting rod 5 and the second adjusting rod 6 is the same and the displacement direction is opposite to the initial position, the stirring angle of the first stirring blade 3 and the second stirring blade 4 is the same, referring to Figure 9 , at this time, the conveying direction of the first stirring blade 3 and the second stirring blade 4 is opposite, the conveying speed of the first stirring blade 3 and the second stirring blade 4 is almost the same, the axial conveying of the sludge in the overall direction of the stirring box 1 is almost not carried out, the sludge is only conveyed between the adjacent first stirring blade 3 and the second stirring blade 4, and the sludge solidification mixing device is in a single stirring state.

[0050] When the sludge solidification mixing device is in a single stirring state, referring to Figure 9 , at this time, the first stirring blade 3 in the first position C1 and the second stirring blade 4 in the second position C2 form a W1 state, the sludge between the first stirring blade 3 in the first position C1 and the second stirring blade 4 in the second position C2 flows to the middle to form a convection, the position between the first position C1 and the second position C2 is a “strong stirring area”, and the sludge between the second stirring blade 4 in the second position C2 and the first stirring blade 3 in the third position C3 flows to both sides, which is easy to form a “weak stirring area” between the second position C2 and the third position C3.

[0051] In the embodiment, the stirring angle of the first stirring blade 3 in the W1 state is set as a first angle, the stirring angle of the second stirring blade 4 is set as a second angle, and the first angle and the second angle are in a complementary relationship. For example, the first angle is assumed to be 30 degrees, that is, the plane where the stirring part of the first stirring blade 3 is located and the radial plane of the first rotating cylinder 2 are 30 degrees, and the second angle is 150 degrees, that is, the plane where the stirring part of the second stirring blade 4 is located and the radial plane of the first rotating cylinder 2 are 150 degrees.

[0052] In order to reduce the adverse effects of the “weak stirring area” in the mixing space 10 inside the stirring box 1, the relative positions of the first stirring blade 3 and the second stirring blade 4 can be adjusted intermittently, that is, the stirring angle of the first stirring blade 3 is adjusted to the second angle, the second stirring blade 4 is adjusted to the first angle, and the first stirring blade 3 and the second stirring blade 4 become a W2 state. After adjustment, referring to Figure 9 , the sludge between the first stirring blade 3 in the first position C1 and the second stirring blade 4 in the second position C2 flows to both sides, at this time, the position between the first position C1 and the second position C2 is a “weak stirring area”, and the sludge between the second stirring blade 4 in the second position C2 and the first stirring blade 3 in the third position C3 flows to the middle to form a convection, and the position between the second position C2 and the third position C3 forms a “strong stirring area”. The “weak stirring area” and the “strong stirring area” appear alternately in the same area on the conveying path of the stirring box 1, which can improve the stirring effect.

[0053] When the displacement distances of the first adjusting rod 5 and the second adjusting rod 6 relative to their initial positions are different and their displacement directions are opposite, the stirring angles of the first stirring blade 3 and the second stirring blade 4 are different and opposite. (Refer to...) Figure 10 At this time, the first stirring blade 3 and the second stirring blade 4 are in opposite directions, and their conveying speeds are different, resulting in unidirectional sludge conveying. The conveying speed of this unidirectional conveying is the speed difference between the first stirring blade 3 and the second stirring blade 4. At this point, the sludge solidification and mixing equipment is in a bidirectional differential speed conveying and mixing state.

[0054] Furthermore, the third and fourth stirring groups extend along the corresponding shaft sections of the second adjusting rod group, and the third stirring blade 12 and the fourth stirring blade 13 are arranged axially at intervals in the first rotating cylinder 2. The third adjusting rod 16 in the second adjusting rod group is sleeved on the outside of the fourth adjusting rod 17, and a spline is provided between the third adjusting rod 16 and the fourth adjusting rod 17, allowing for axial sliding connection between the third adjusting rod 16 and the fourth adjusting rod 17.

[0055] A second support sleeve 18 is fixedly installed inside the first rotating cylinder 2. The second support sleeve 18 is sleeved on the outside of the third adjusting rod 16. The second support sleeve 18 supports the third adjusting rod 16. A linear bearing is provided between the second support sleeve 18 and the third adjusting rod 16 to form an axial sliding connection between the second support sleeve 18 and the third adjusting rod 16.

[0056] The third stirring blade 12 is connected to the third adjusting rod 16 via the third connecting structure 14. The third adjusting rod 16 can rotate the third stirring blade 12 relative to the radial plane of the first rotating cylinder 2 by moving. The fourth stirring blade 13 is connected to the fourth adjusting rod 17 via the fourth connecting structure 15. The fourth adjusting rod 17 can rotate the fourth stirring blade 13 relative to the radial plane of the first rotating cylinder 2 by moving.

[0057] In this embodiment, the third connecting structure 14, the fourth connecting structure 15, the first connecting structure 7, and the second connecting structure 8 have the same structure. The structure of the third connecting structure 14 corresponds completely to the structure of the first connecting structure 7, and the structure of the fourth connecting structure 15 corresponds completely to the structure of the second connecting structure 8.

[0058] The third coupling structure 14 includes a third connecting rod fixedly connected to the third adjusting rod 16. The fourth coupling structure 15 includes a fourth connecting rod, and the third adjusting rod 16 is provided with a second movable slot 161, and the fourth connecting rod is fixedly connected to the fourth adjusting rod 17 through the second movable slot 161. When the third adjusting rod 16 moves axially relative to the first rotating cylinder 2, the third connecting rod moves with the third adjusting rod 16, realizing the radial rotation of the third stirring blade 12 relative to the first rotating cylinder 2, and changing the stirring angle of the third stirring blade 12. When the fourth adjusting rod 17 moves axially relative to the first rotating cylinder 2, the fourth connecting rod moves with the fourth adjusting rod 17, realizing the radial rotation of the fourth stirring blade 13 relative to the first rotating cylinder 2, and changing the stirring angle of the fourth stirring blade 13.

[0059] The first adjusting rod group and the second adjusting rod group correspond to the stirring blades of the shaft sections to form the same or different stirring angles, for adapting to different stirring requirements. When the first adjusting rod group and the second adjusting rod group correspond to the stirring blades of the shaft sections to form the same stirring angle, a one-way conveying stirring state of the stirring box 1 as a whole is formed. When the first adjusting rod group and the second adjusting rod group correspond to the stirring blades of the shaft sections to form different stirring angles, a segmented conveying stirring state of the stirring box 1 is formed. For example, a large-angle stirring is adopted in the shaft section on the feeding side where the first adjusting rod group is located, the stirring efficiency is high, and the mixing effect is strengthened. A small-angle stirring is adopted in the shaft section on the discharging side where the second adjusting rod group is located, the stirring efficiency is low, and the mixing effect is weakened, which can be used for eliminating the internal bubbles of the sludge and generating a pre-curing effect.

[0060] The inside of the stirring box 1 is also provided with a second stirring shaft, and the second stirring shaft includes a second rotating cylinder 9 which is the same in structure as the first rotating cylinder 2 and is arranged in parallel. The stirring blades on the second rotating cylinder 9 are arranged in axial staggered manner with the stirring blades of the first rotating cylinder 2.

[0061] In the embodiment, the feeding side of the stirring box 1 is fixedly installed with a first support 21, and the first support 21 is installed with a first function cylinder 19 and a second function cylinder 20. The axes of the first function cylinder 19 and the second function cylinder 20 are parallel to the axis of the stirring shaft. The first function cylinder 19 is fixedly installed on the first support 21, and the working end of the first function cylinder 19 is fixedly connected with a first connecting plate, and the first connecting plate is rotationally connected with the end of the first adjusting rod 5. The first function cylinder 19 is used to drive the first adjusting rod 5 to move axially. The second function cylinder 20 is fixedly installed on the first support 21, and the working end of the second function cylinder 20 is rotationally connected with the end of the second adjusting rod 6. The second function cylinder 20 is used to drive the second adjusting rod 6 to move axially. The number of the first function cylinder 19 and the second function cylinder 20 is two respectively, and they are respectively used for the axial position adjustment of the first adjusting rod group corresponding to the first rotating cylinder 2 and the second rotating cylinder 9.

[0062] In this embodiment, the discharge side of the stirring box 1 is fixedly installed with a second support 24, the third function cylinder 22 and the fourth function cylinder 23 are installed on the second support 24, and the axes of the third function cylinder 22 and the fourth function cylinder 23 are parallel to the axis of the stirring shaft. The third function cylinder 22 is fixedly installed on the second support 24, the working end of the third function cylinder 22 is fixedly connected with a second connecting plate, the second connecting plate is rotatably connected with the end of the third adjusting rod 16, and the third function cylinder 22 is used to drive the third adjusting rod 16 to move axially. The fourth function cylinder 23 is fixedly installed on the second support 24, the working end of the fourth function cylinder 23 is rotatably connected with the end of the third adjusting rod 16, and the fourth function cylinder 23 is used to drive the fourth adjusting rod 17 to move axially. The number of the third function cylinder 22 and the fourth function cylinder 23 is two respectively, which are respectively used for the axial position adjustment of the second rotating cylinder 9 and the first rotating cylinder 2 corresponding to the second adjusting rod group.

[0063] The first rotating cylinder 2 and the second rotating cylinder 9 are extended from the discharge side of the stirring box 1 at one end, the extended end of the first rotating cylinder 2 is fixedly sleeved with a first gear 202, the extended end of the second rotating cylinder 9 is fixedly sleeved with a second gear 91, and the first gear 202 is engaged with the second gear 91. A mixing motor 25 is arranged on the second support 24, the output shaft of the mixing motor 25 is connected with a rotating shaft through a shaft coupling, the rotating shaft is installed on the stirring box 1 through a bearing seat, the axis of the rotating shaft is parallel to the axes of the first rotating cylinder 2 and the second rotating cylinder 9, the rotating shaft is fixedly sleeved with a third gear 26, and the third gear 26 is engaged with the first gear 202. The mixing motor 25 can drive the third gear 26 to rotate, the third gear 26 drives the first gear 202 to rotate, the first gear 202 can drive the second gear 91 to rotate synchronously and reversely, the rotating actions of the first rotating cylinder 2 and the second rotating cylinder 9 are formed, and the rotating directions of the first rotating cylinder 2 and the second rotating cylinder 9 are opposite.

[0064] Further, a cover plate 101 is arranged on the top of the stirring box 1, which is used for sealing the top of the stirring box 1 to reduce and avoid the overflow of pollutants. A feeding port is arranged on the cover plate 101, which is located at the feeding end of the stirring box 1 and is used for feeding sludge into the stirring box 1. A discharge port 103 is arranged at the bottom of the discharge end of the stirring box 1. The sludge enters the stirring box 1 from the feeding port of the stirring box 1, and is discharged from the discharge port 103 after the stirring and mixing are completed.

[0065] In this embodiment, a feeding pipe 102 is designed on the upper part of the stirring box 1, which is used for feeding the curing agent into the stirring box 1. The feeding pipe 102 is fixedly installed on the cover plate 101, is arranged close to the feeding port of the cover plate 101, and is in communication with the inside of the stirring box 1 at one end of the cover plate 101.

[0066] This sludge solidification and mixing equipment is used to treat sludge containing hazardous waste. After filter pressing, the sludge is initially crushed. The crushed sludge enters the mixing tank 1 through the inlet. A solidifying agent is introduced into the mixing tank 1 through the feed pipe 102. The mixing shaft agitates the sludge, and the solidifying agent and sludge are mixed inside the mixing tank 1. The mixed sludge is then discharged from the mixing tank 1 through the outlet 103. The agitator blades on the agitator shaft inside the mixing tank 1 of this sludge solidification and mixing equipment can be angled to form different mixing modes, suitable for mixing different types of sludge.

[0067] In the first state, unidirectional conveying and stirring, when the displacement distance and direction of the first adjusting rod 5, the second adjusting rod 6, the third adjusting rod 16, and the fourth adjusting rod 17 relative to their initial positions are the same, then the stirring angles of the first stirring blade 3, the second stirring blade 4, the third stirring blade 12, and the fourth stirring blade 13 are the same. (Reference) Figure 8 At this time, the first stirring blade 3, the second stirring blade 4, the third stirring blade 12, and the fourth stirring blade 13 all move in the same direction, forming a unidirectional conveying of sludge. The sludge solidification and mixing equipment is in a unidirectional conveying and stirring state. In this state, the sludge in the mixing tank 1 is conveyed while being stirred and mixed. The sludge moves inside the mixing tank 1, passing through all the stirring blades in sequence. Sludge discharge and feeding can occur simultaneously, creating a continuous mixing effect. Electroplating sludge and cement-based solidifier can be mixed and solidified using a unidirectional conveying and stirring state, maintaining low speed and long-term stirring to ensure the hydration reaction proceeds normally.

[0068] In the second state, the individual stirring state, when the first adjusting rod 5 and the third adjusting rod 16 move a distance L1 relative to their initial positions in the first direction and the distance M1, the second adjusting rod 6 and the fourth adjusting rod 17 also move a distance L1 relative to their initial positions in the second direction, away from the first direction. At this time, the first stirring blade 3, the second stirring blade 4, the third stirring blade 12, and the fourth stirring blade 13 have the same deflection angle. Specifically, the first stirring blade 3 and the third stirring blade 12 rotate clockwise around the rotating column 31, while the second stirring blade 4 and the fourth stirring blade 13 rotate counterclockwise around the rotating column 31; or the first stirring blade 3 and the third stirring blade 12 rotate counterclockwise around the rotating column 31, while the second stirring blade 4 and the fourth stirring blade 13 rotate clockwise around the rotating column 31.

[0069] For example, the first stirring blade 3 and the third stirring blade 12 rotate 60 degrees clockwise with the rotating column 31 as the rotating shaft, at this time, the angle between the stirring part plane of the first stirring blade 3 and the third stirring blade 12 and the radial plane is 30 degrees, while the second stirring blade 4 and the fourth stirring blade 13 rotate 60 degrees counterclockwise with the rotating column 31 as the rotating shaft, at this time, the angle between the stirring part plane of the second stirring blade 4 and the fourth stirring blade 13 and the radial plane is 150 degrees.

[0070] Reference Figure 9 The first stirring blade 3 and the third stirring blade 12 have the same conveying direction, the second stirring blade 4 and the fourth stirring blade 13 have the same conveying direction, the first stirring blade 3 and the second stirring blade 4 have opposite conveying directions, and the third stirring blade 12 and the fourth stirring blade 13 have opposite conveying directions, for example, refer to W1 or W2 in Figure 9 , the sludge is conveyed relatively between adjacent stirring blades, for example, in the W1 state, the sludge at the first position C1 is conveyed to the adjacent second stirring blade 4 under the action of the first stirring blade 3, while the sludge at the second position C2 is conveyed to the previous first stirring blade 3 under the action of the second stirring blade 4, forming a convection between adjacent stirring blades, which can enhance the stirring effect and improve the mixing effect. The conveying speed difference between the first stirring blade 3 and the second stirring blade 4 and between the third stirring blade 12 and the fourth stirring blade 13 is almost zero, so the overall axial conveying of the sludge does not occur, only regional axial conveying occurs between the first position C1 and the second position C2, thereby forming a separate stirring state. The separate stirring state is used for strong stirring and mixing between the sludge and the solidifying agent, and there is no one-way conveying effect.

[0071] When the sludge solidification and mixing device is in the separate stirring state, in order to reduce the adverse effects of the "weak stirring area" in the mixing space 10 inside the stirring box 1, the relative positions of the first stirring blade 3 and the second stirring blade 4 and the relative positions of the third stirring blade 12 and the fourth stirring blade 13 can be adjusted intermittently, that is, the positions between the first adjusting rod 5 and the second adjusting rod 6 and between the third adjusting rod 16 and the fourth adjusting rod 17 are intermittently exchanged, and the first stirring blade 3, the second stirring blade 4, the third stirring blade 12 and the fourth stirring blade 13 are intermittently converted between the W1 state and the W2 state. The "weak stirring area" and the "strong stirring area" appear alternately in the same area on the conveying path of the stirring box 1, which can improve the stirring effect.

[0072] Before the separate stirring state is implemented, the one-way conveying and stirring state is used for sludge conveying, so that the sludge can quickly spread in the stirring box 1. This mode can be used when a small amount of sludge is mixed and solidified. This mode can be used for high-viscosity sludge that needs strong shearing force to break the agglomerated structure, forming rapid and strong stirring and mixing.

[0073] Third state, bidirectional differential conveying and stirring state, when the first adjusting rod 5 and the third adjusting rod 16 move a distance L1 relative to the initial position in the first direction, and the second adjusting rod 6 and the fourth adjusting rod 17 move a distance L2 relative to the initial position in the second direction, the first direction is opposite to the second direction. Figure 10 At this time, the stirring angle and conveying direction of the first stirring blade 3 and the third stirring blade 12 are the same, the stirring angle and conveying direction of the second stirring blade 4 and the fourth stirring blade 13 are the same, the conveying direction of the first stirring blade 3 and the second stirring blade 4 is opposite and has a conveying speed difference, and the conveying direction of the third stirring blade 12 and the fourth stirring blade 13 is opposite and has a conveying speed difference, so that unidirectional conveying of the sludge can be formed (the conveying direction needs to keep the sludge flowing to the discharge port 103). The conveying speed of the unidirectional conveying is the conveying speed difference between the first stirring blade 3 and the second stirring blade 4 or the conveying speed difference between the third stirring blade 12 and the fourth stirring blade 13. At this time, the sludge solidification mixing device is in the bidirectional differential conveying and stirring state. In this stirring state, the sludge sequentially passes through a plurality of stirring zones such as the "strong stirring zone" between the C1 position and the C2 position and the "weak stirring zone" between the C2 position and the C3 position, and finally is discharged from the discharge port 103.

[0074] The bidirectional differential conveying and stirring state described above is used for strong stirring and mixing between the sludge and the solidifying agent and unidirectional conveying, and the convection stirring can improve the mixing efficiency. The oil-containing sludge and the polymer solidification require high-speed and short-time mixing to achieve rapid dispersion, and this mode cooperates with the high-speed rotation of the stirring shaft to form rapid stirring and mixing and conveying.

[0075] It is worth noting that in the bidirectional differential conveying and stirring state, the stirring angle between the first stirring blade 3 and the second stirring blade 4 and the stirring angle between the third stirring blade 12 and the fourth stirring blade 13 can also be intermittently converted, so that the "weak stirring zone" and the "strong stirring zone" alternately appear in the same area on the conveying path of the stirring box 1. When the sludge passes through the "strong stirring zone" between the C1 position and the C2 position, the first stirring blade 3, the second stirring blade 4, the third stirring blade 12 and the fourth stirring blade 13 are converted from the W1 state to the W2 state, the "weak stirring zone" between the C2 position and the C3 position is changed to the "strong stirring zone", the sludge enters the "strong stirring zone" between the C2 position and the C3 position, and the W1 state and the W2 state are intermittently converted, so that the sludge can always be in the "strong stirring zone" and the stirring efficiency is high.

[0076] Fourth state, as Figure 11As shown, the sludge solidification mixing device can perform sludge segmented processing in the segmented conveying and stirring state, that is, the first adjusting rod set and the second adjusting rod set correspond to the stirring blades of the shaft segments to form different stirring angles, thereby forming the segmented conveying and stirring state of the stirring box 1. For example, the first adjusting rod 5 and the second adjusting rod 6 are moved by a distance L3 relative to the initial position, and the moving direction is the first direction; the third adjusting rod 16 and the fourth adjusting rod 17 are moved by a distance L4 relative to the initial position, and the moving direction is the first direction, wherein the distance L3 is greater than the distance L4. At this time, the stirring angles of the first stirring blade 3 and the second stirring blade 4 are greater than the stirring angles of the third stirring blade 12 and the fourth stirring blade 13, the first stirring blade 3 and the second stirring blade 4 have high stirring efficiency and have strong stirring effect, and are used to realize efficient mixing between the sludge and the solidifying agent, the third stirring blade 12 and the fourth stirring blade 13 have low stirring efficiency, and are mainly used to eliminate the air bubbles in the sludge, reduce the gas in the sludge after solidification, and produce a pre-curing effect.

[0077] The pre-curing in the embodiment refers to that, before formal curing, the initial hydration or chemical reaction of the solidifying agent is promoted through micro-stirring, so as to reduce the cracking risk of the solidified body, improve the early strength, and optimize the heavy metal fixation effect. Therefore, the segmented conveying and stirring state is suitable for mixed solidification processing of sludge containing heavy metals, high-speed stirring and mixing are performed, then low-speed stirring is performed, and then natural curing is performed.

[0078] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacements or changes to the technical solutions and the inventive concept of the present application within the technical range disclosed by the present application, and all of them should be covered within the protection scope of the present application.

Claims

1. A sludge solidification and mixing device containing hazardous waste, comprising a mixing tank and two mixing shafts located inside the mixing tank, wherein multiple mixing blades are provided on the mixing shafts, characterized in that, The stirring shaft includes a rotating cylinder that is rotatably connected to the stirring box at both ends. A first stirring blade, a second stirring blade, a third stirring blade, and a fourth stirring blade are rotatably connected to the rotating cylinder. The stirring blades with the same radial surface form a stirring group, and multiple stirring groups are evenly arranged along the axial direction of the rotating cylinder. The stirring group formed by the first stirring blade and the stirring group formed by the second stirring blade are spaced apart, and the stirring group formed by the third stirring blade and the stirring group formed by the fourth stirring blade are spaced apart. The rotating cylinder is internally equipped with multiple connecting structures and coaxial first, second, third, and fourth adjusting rods. The connecting structures convert the displacement of the adjusting rods into changes in the angle of the stirring blades. The first stirring blade, second stirring blade, first adjusting rod, and second adjusting rod are located on the feed side of the mixing tank. The second adjusting rod is axially slidably connected to the first adjusting rod. The first stirring blade is connected to the first adjusting rod via a first connecting structure, and the second stirring blade is connected to the second adjusting rod via a second connecting structure. The third stirring blade, fourth stirring blade, third adjusting rod, and fourth adjusting rod are located on the discharge side of the mixing tank. The fourth adjusting rod is axially slidably connected to the third adjusting rod. The third stirring blade is connected to the third adjusting rod via a third connecting structure, and the fourth stirring blade is connected to the fourth adjusting rod via a fourth connecting structure.

2. The sludge solidification and mixing equipment containing hazardous waste according to claim 1, characterized in that, The connection structure includes a connecting sleeve, a telescopic rod, a connecting seat, and a connecting rod. The connecting sleeve is fixedly sleeved on the rotating column of the stirring blade. The connecting sleeve and the connecting seat are connected by the telescopic rod. The connecting seat is rotatably connected to the first end of the connecting rod, and the second end of the connecting rod is fixedly connected to the adjusting rod.

3. The sludge solidification and mixing equipment containing hazardous waste according to claim 2, characterized in that, Multiple mounting seats are fixedly installed on the rotating cylinder. The position and number of the mounting seats correspond to the stirring blades. The stirring blades are rotatably connected to the mounting seats through a rotating column.

4. The sludge solidification and mixing equipment containing hazardous waste according to claim 3, characterized in that, The axis of the connecting rod is parallel to the axis of rotation of the stirring blade, and the axis of the telescopic rod is perpendicular to the axis of rotation of the stirring blade.

5. The sludge solidification and mixing equipment containing hazardous waste according to claim 4, characterized in that, It includes a first functional cylinder for driving the first adjusting rod to move axially, a second functional cylinder for driving the second adjusting rod to move axially, a third functional cylinder for driving the third adjusting rod to move axially, and a fourth functional cylinder for driving the fourth adjusting rod to move axially.

6. The sludge solidification and mixing equipment containing hazardous waste according to claim 5, characterized in that, The first and second functional cylinders are installed on the feeding side of the mixing tank, and the third functional cylinder is installed on the discharging side of the mixing tank.

7. The sludge solidification and mixing equipment containing hazardous waste according to claim 6, characterized in that, One end of the rotating cylinder extends from the mixing tank, and gears are fixedly sleeved on the extended ends of the two rotating cylinders respectively, and the two gears mesh.

8. The sludge solidification and mixing equipment containing hazardous waste according to any one of claims 1-7, characterized in that, The top of the mixing tank is provided with a cover plate, and the cover plate is provided with a feed port at the feed end of the mixing tank.

9. The sludge solidification and mixing equipment containing hazardous waste according to claim 8, characterized in that, A feeding pipe is provided at the top of the mixing tank.

10. The sludge solidification and mixing equipment containing hazardous waste according to claim 9, characterized in that, The bottom of the discharge end of the mixing tank is provided with a discharge port.

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