Curing and mixing equipment for sludge containing hazardous wastes

Abstract

The invention discloses hazardous waste-containing sludge solidification mixing equipment which comprises a stirring box and two stirring shafts located in the stirring box, and a first stirring blade, a second stirring blade, a third stirring blade and a fourth stirring blade are rotationally connected to rotating cylinders of the stirring shafts respectively; a first adjusting rod, a second adjusting rod, a third adjusting rod and a fourth adjusting rod which are coaxial 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, and the third stirring blade is connected with the third adjusting rod through a third connecting structure. The fourth stirring blade is connected with a fourth adjusting rod through a fourth connecting structure, the angle change of the stirring blade can be formed by moving the adjusting rod, the angle of the stirring blade on the stirring shaft of the sludge solidification mixing equipment can be adjusted, so that different stirring modes are formed, and the stirring requirements of different sludge-solidification agent systems are 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: 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.

[0007] 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.

[0008] 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.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] The two rotating barrels are respectively provided with gear sleeves fixed on the extending ends of the two rotating barrels, and the two gear sleeves are engaged.

[0014] Preferably, the top of the stirring box is provided with a cover plate, and the cover plate is provided with a feeding port at the feeding end of the stirring box.

[0015] Preferably, the upper part of the stirring box is provided with a feeding pipe.

[0016] Preferably, the bottom of the discharging end of the stirring box is provided with a discharging port.

[0017] The present application has the following advantages: 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.

[0018] 2. The stirring shaft of the sludge solidification mixing device is provided with an adjusting rod group. The adjusting rods in the adjusting rod group adjust the angle of the stirring blades by moving to realize different stirring angles of the adjacent stirring blades on the stirring shaft, and form convection in the mixing space to enhance the stirring effect and improve the mixing degree.

[0019] 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 can perform dynamic pre-curing after the sludge and the solidifying agent are mixed to adapt to different stirring requirements. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structure schematic view of the sludge solidification mixing device containing hazardous waste from the top; Figure 2 It is a structure schematic view of the stirring box of the sludge solidification mixing device containing hazardous waste; Figure 3 It is a structure schematic view of the first stirring shaft of the sludge solidification mixing device containing hazardous waste; 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; 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; Figure 6 It is a structure schematic view of the first coupling structure of the sludge solidification mixing device containing hazardous waste; Figure 7 Structure diagram of the second stirring blade radial section of the hazardous waste-containing sludge solidification and mixing device; Figure 8 Diagram of the one-way conveying and stirring state of the hazardous waste-containing sludge solidification and mixing device; Figure 9 Diagram of the single stirring state of the hazardous waste-containing sludge solidification and mixing device; Figure 10 Diagram of the two-way differential conveying and stirring state of the hazardous waste-containing sludge solidification and mixing device; Figure 11 Diagram of the segmented conveying and stirring state of the hazardous waste-containing sludge solidification and mixing device.

[0021] 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; 101, cover plate; 102, feeding pipe; 201, mounting seat; 202, first gear; 31, rotating column; 51, first movable groove; 71, connecting sleeve; 72, telescopic rod; 73, connecting seat; 74, first connecting rod; 81, second connecting rod; 91, second gear; 161, second movable groove. DETAILED DESCRIPTION

[0022] 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.

[0023] Reference Figure 1 , Figure 2 and Figure 5 A hazardous waste-containing sludge solidification and mixing device, comprising a stirring box 1, the inside of the stirring box 1 is provided with two parallel stirring shafts, the two stirring shafts comprising a first stirring shaft and a second stirring shaft, the first stirring shaft and the second stirring shaft are respectively rotationally connected with the stirring box 1. The stirring shafts are provided with stirring blades, the stirring blades are used for stirring the sludge inside the stirring box 1, and a mixing space 10 is formed inside the stirring box 1.

[0024] In the embodiment, the first stirring shaft comprises a first rotating cylinder 2, both ends of the first rotating cylinder 2 are rotationally connected with the stirring box 1. A plurality of stirring blades are rotationally connected on the first rotating cylinder 2. A plurality of mounting seats 201 are fixedly arranged on the first rotating cylinder 2, the mounting seats 201 are fixedly connected with the first rotating cylinder 2 by bolts, the positions and the number of the mounting seats 201 correspond to the stirring blades, and the mounting seats 201 are used for mounting the stirring blades. The stirring blades comprise stirring parts and rotating columns 31, wherein the stirring parts are located outside the first rotating cylinder 2, the rotating columns 31 penetrate the mounting seats 201 and are inserted into the first rotating cylinder 2, and the rotating columns 31 are rotationally connected with the mounting seats 201.

[0025] Further, the stirring blades comprise first stirring blades 3, second stirring blades 4, third stirring blades 12 and fourth stirring blades 13. The stirring blades are uniformly arranged along the axial direction of the first rotating cylinder 2 and respectively form four stirring groups. A plurality of first stirring blades 3 are uniformly arranged on the same radial surface of the first rotating cylinder 2 to form a first stirring group. Similarly, a plurality of second stirring blades 4 are uniformly arranged to form a second stirring group, a plurality of third stirring blades 12 are uniformly arranged to form a third stirring group, and a plurality of fourth stirring blades 13 are uniformly arranged 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 arranged at intervals along the axial direction; the third stirring group and the fourth stirring group are located on the discharging side of the stirring box 1 and are also arranged at intervals along the axial direction.

[0026] 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 the first adjusting rod group comprises 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 the second adjusting rod group comprises 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 respectively coaxially arranged with the first rotating cylinder 2 and are axially slidably connected.

[0027] The first stirring group and the second stirring group extend on the corresponding shaft section of the first adjusting rod group, and the first stirring blades 3 and the second stirring blades 4 are arranged at intervals along the axial direction of the first adjusting rod group. The first adjusting rod 5 in the first adjusting rod group is sleeved outside the second adjusting rod 6, a spline is arranged between the second adjusting rod 6 and the first adjusting rod 5, and the second adjusting rod 6 is axially slidably connected with the first adjusting rod 5. Therefore, the second adjusting rod 6 can slide along the axial direction in the first adjusting rod 5 while keeping synchronous rotation with the first adjusting rod 5.

[0028] The first rotating cylinder 2 is internally fixed with a first supporting sleeve 11, which is sleeved on the outside of the first adjusting rod 5, supports the first adjusting rod 5, and is provided with a linear bearing between the first supporting sleeve 11 and the first adjusting rod 5 to form an axial sliding connection therebetween, so that the first adjusting rod 5 can slide in the first supporting sleeve 11 in the axial direction while keeping synchronous rotation with the first rotating cylinder 2.

[0029] The first stirring blade 3 is connected with the first adjusting rod 5 through the first connecting structure 7, and the first adjusting rod 5 can rotate the first stirring blade 3 with its rotating column 31 as the rotating shaft by moving, so as to adjust the inclination angle of the first stirring blade 3 with the radial plane and change the stirring intensity and the material flow direction.

[0030] The second stirring blade 4 is connected with the second adjusting rod 6 through the second connecting structure 8, and the second adjusting rod 6 can rotate the second stirring blade 4 with its rotating column 31 as the rotating shaft by moving, so as to adjust the inclination angle of the second stirring blade 4 with the radial plane of the first rotating cylinder 2 and change the stirring intensity and the material flow direction.

[0031] 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 and the connecting seat 73 are connected through the extension rod 72, the connecting seat 73 is rotationally connected to the first end of the first connecting rod 74, and 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, and the axes of the extension rod 72 are perpendicular to the axes of the rotating column 31 of the first stirring blade 3 and the first connecting rod 74, respectively.

[0032] 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 extension rod 72 to move, and since the rotating column 31 does not move axially, the extension rod 72 will expand and rotate, thereby forming the rotation of the rotating column 31, i.e. realizing the rotation of the first stirring blade 3 relative to the radial plane of the first rotating cylinder 2, and changing the stirring angle of the first stirring blade 3.

[0033] The first connecting structure 7 and the second connecting structure 8 are the same in structure, and reference Figure 7The second connecting structure 8 includes a second connecting rod 81, which is fixedly connected to the second adjusting rod 6. In this embodiment, the first adjusting rod 5 is provided with a plurality of first movable grooves 51, which are used to accommodate the passage of the second connecting rod 81. The first movable groove 51 is an elongated through groove extending axially from the first adjusting rod 5, and the second connecting rod 81 can move axially within 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, thereby realizing the rotation of the second stirring blade 4 relative to the radial plane of the first rotating cylinder 2 and changing the stirring angle of the second stirring blade 4.

[0034] When the first stirring blade 3 and the second stirring blade 4 are in their initial positions, the plane containing the stirring parts 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 their initial positions. 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. The plane containing the stirring parts of the first stirring blade 3 and the second stirring blade 4 forms a certain angle with respect to the radial plane of the first rotating cylinder 2. This angle is the stirring angle. When the first stirring blade 3 and the second stirring blade 4 have a 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 radial plane of the first rotating cylinder 2 form a 30-degree angle, the first stirring blade 3 not only achieves full stirring of the sludge during rotation, but also pushes the sludge axially, improving mixing efficiency and conveying capacity.

[0035] When the displacement distance and direction of the first adjusting rod 5 and the second adjusting rod 6 relative to their initial positions are the same, then the stirring angles of the first stirring blade 3 and the second stirring blade 4 are the same. (Refer to...) Figure 8 At this time, the first stirring blade 3 and the second stirring blade 4 are in the same conveying direction, which can form a unidirectional conveying of sludge. At this time, the sludge solidification and mixing equipment is in a unidirectional conveying and stirring state.

[0036] When the displacement distances of the first adjusting rod 5 and the second adjusting rod 6 relative to their initial positions are the same but their displacement directions are opposite, then the stirring angles of the first stirring blade 3 and the second stirring blade 4 are the same. (Refer to...) Figure 9 At this time, the first stirring blade 3 and the second stirring blade 4 are in opposite directions, and the first stirring blade 3 and the second stirring blade 4 are at almost the same speed. The sludge is hardly transported axially in the overall direction of the mixing box 1. The sludge is only transported between adjacent first stirring blade 3 and second stirring blade 4. This sludge solidification and mixing equipment is in a separate stirring state.

[0037] When this sludge solidification and mixing equipment is in individual mixing mode, refer to... Figure 9At this time, the first stirring blade 3 and the second stirring blade 4 are in the W1 state, the sludge between the first stirring blade 3 at the first position C1 and the second stirring blade 4 at 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 zone", and the sludge between the second stirring blade 4 at the second position C2 and the first stirring blade 3 at the third position C3 flows to both sides, which is easy to form a "weak stirring zone" between the second position C2 and the third position C3.

[0038] In the embodiment, the stirring angle of the first stirring blade 3 in the W1 state is a first angle, and the stirring angle of the second stirring blade 4 is 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 at an angle of 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 at an angle of 150 degrees.

[0039] In order to reduce the adverse effects of the "weak stirring zone" 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, and the second stirring blade 4 is adjusted to the first angle, and the first stirring blade 3 and the second stirring blade 4 are in the W2 state. After adjustment, referring to Figure 9 , the sludge between the first stirring blade 3 at the first position C1 and the second stirring blade 4 at 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 zone", and the sludge between the second stirring blade 4 at the second position C2 and the first stirring blade 3 at 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 zone". The "weak stirring zone" and the "strong stirring zone" appear alternately in the same area on the conveying path of the stirring box 1, which can improve the stirring effect.

[0040] When the displacement distances of the first adjusting rod 5 and the second adjusting rod 6 relative to the initial positions are different and the displacement directions are opposite, the stirring angles of the first stirring blade 3 and the second stirring blade 4 are different and opposite, referring to Figure 10 At this time, the conveying directions of the first stirring blade 3 and the second stirring blade 4 are opposite, the conveying speeds of the first stirring blade 3 and the second stirring blade 4 are different, and the one-way conveying of the sludge can be formed. The conveying speed of the one-way conveying is the difference between the conveying speeds of the first stirring blade 3 and the second stirring blade 4. At this time, the sludge solidification and mixing equipment is in a two-way differential speed conveying and stirring state.

[0041] Further, the third stirring group and the fourth stirring group extend along the corresponding shaft sections of the second adjusting rod group, and the third stirring blades 12 and the fourth stirring blades 13 are arranged in an axial interval in the first rotating cylinder 2. The third adjusting rod 16 in the second adjusting rod group is sleeved outside the fourth adjusting rod 17, and a spline is arranged between the third adjusting rod 16 and the fourth adjusting rod 17, and the third adjusting rod 16 and the fourth adjusting rod 17 are axially slidably connected.

[0042] The second support sleeve 18 is fixedly arranged in the interior of the first rotating cylinder 2, the second support sleeve 18 is sleeved outside the third adjusting rod 16, the second support sleeve 18 supports the third adjusting rod 16, and a linear bearing is arranged between the second support sleeve 18 and the third adjusting rod 16, thereby forming an axial sliding connection between the second support sleeve 18 and the third adjusting rod 16.

[0043] The third stirring blades 12 are connected with the third adjusting rod 16 through the third connecting structure 14, and the third adjusting rod 16 can realize the radial rotation of the third stirring blades 12 relative to the first rotating cylinder 2 by moving. The fourth stirring blades 13 are connected with the fourth adjusting rod 17 through the fourth connecting structure 15, and the fourth adjusting rod 17 can realize the radial rotation of the fourth stirring blades 13 relative to the first rotating cylinder 2 by moving.

[0044] In the 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 completely corresponds to the structure of the first connecting structure 7, and the structure of the fourth connecting structure 15 completely corresponds to the structure of the second connecting structure 8.

[0045] The third connecting structure 14 includes a third connecting rod, and the third connecting rod is fixedly connected to the third adjusting rod 16. The fourth connecting 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 passes through the second movable slot 161 and is fixedly connected to the fourth adjusting rod 17. 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, thereby realizing the radial rotation of the third stirring blades 12 relative to the first rotating cylinder 2 and changing the stirring angle of the third stirring blades 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, thereby realizing the radial rotation of the fourth stirring blades 13 relative to the first rotating cylinder 2 and changing the stirring angle of the fourth stirring blades 13.

[0046] 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, so as to adapt 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 whole stirring box 1 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, so as to enhance the mixing effect and improve the stirring efficiency. A small-angle stirring is adopted in the shaft section on the discharging side where the second adjusting rod group is located, so as to weaken the mixing effect and reduce the stirring efficiency, which can be used for eliminating the internal bubbles of the sludge and generating a pre-curing effect.

[0047] The inside of the stirring box 1 is further provided with a second stirring shaft, and the second stirring shaft comprises a second rotating cylinder 9 which is arranged in parallel with the first rotating cylinder 2 and has the same structure as the first rotating cylinder 2. The stirring blades on the second rotating cylinder 9 are arranged in an axial staggered manner with the stirring blades of the first rotating cylinder 2.

[0048] In the embodiment, the feeding side of the stirring box 1 is fixedly provided with a first support 21, and the first support 21 is provided 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. The first connecting plate is rotatably connected with the end of the first adjusting rod 5, and 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 rotatably 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.

[0049] In the embodiment, the discharging side of the stirring box 1 is fixedly provided with a second support 24, and the second support 24 is provided with a third function cylinder 22 and a fourth function cylinder 23. 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, and 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, and the working end of the fourth function cylinder 23 is rotatably connected with the end of the third adjusting rod 16. 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, and they are respectively used for the axial position adjustment of the second adjusting rod group corresponding to the second rotating cylinder 9 and the first rotating cylinder 2.

[0050] One end of the first rotating cylinder 2 and the second rotating cylinder 9 extends from the discharge side of the mixing box 1, a first gear 202 is fixedly sleeved on the extending end of the first rotating cylinder 2, a second gear 91 is fixedly sleeved on the extending end of the second rotating cylinder 9, 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 mixing 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, a third gear 26 is fixedly sleeved on the rotating shaft, 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, and the first gear 202 can drive the second gear 91 to rotate in the opposite direction synchronously, thereby forming the rotating actions of the first rotating cylinder 2 and the second rotating cylinder 9, and the rotating directions of the first rotating cylinder 2 and the second rotating cylinder 9 are opposite.

[0051] Further, a cover plate 101 is arranged on the top of the mixing box 1, which is used for sealing the top of the mixing box 1 to reduce and avoid the overflow of pollutants. An inlet is arranged on the cover plate 101, which is located at the feeding end of the mixing box 1 and is used for feeding sludge into the mixing box 1. An outlet 103 is arranged at the bottom of the discharge end of the mixing box 1. The sludge enters the mixing box 1 from the inlet of the mixing box 1, and is discharged from the outlet 103 after the mixing and blending are completed.

[0052] In the embodiment, a feeding pipe 102 is designed on the upper portion of the mixing box 1, which is used for feeding the curing agent into the mixing box 1. The feeding pipe 102 is fixedly installed on the cover plate 101, is arranged close to the inlet of the cover plate 101, and is in communication with the inside of the mixing box 1 at one end of the cover plate 101.

[0053] The sludge containing hazardous waste is preliminarily crushed after being pressed and filtered, enters the mixing box 1 from the inlet of the mixing box 1, and the curing agent can be introduced into the inside of the mixing box 1 through the feeding pipe 102. The stirring shaft stirs the sludge, the curing agent and the sludge are mixed in the inside of the mixing box 1, and the mixed sludge is discharged from the outlet 103 of the mixing box 1. The stirring blades on the stirring shaft in the mixing box 1 of the sludge curing and mixing device can be adjusted in angle to form different stirring modes, which are suitable for the mixing treatment of different sludge.

[0054] In the first state, the unidirectional conveying and stirring state, the displacement distances and directions of the first adjusting rod 5, the second adjusting rod 6, the third adjusting rod 16 and the fourth adjusting rod 17 relative to the initial positions are the same, 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, and the reference Figure 8At this time, the conveying directions 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, and one-way conveying of the sludge can be formed, and at this time, the sludge solidification mixing device is in the one-way conveying and stirring state. In this state, the sludge in the stirring box 1 can be conveyed while being stirred and mixed, the sludge moves in the stirring box 1, and is sequentially stirred by all the stirring blades, and the sludge discharging and feeding can be performed at the same time, forming the effect of continuous mixing. The electroplating sludge and the cement-based solidifying agent can be mixed and solidified in the one-way conveying and stirring state, low-speed stirring for a long time is maintained, and the hydration reaction is ensured to proceed normally.

[0055] In the second state, the separate stirring state, when the first adjusting rod 5 and the third adjusting rod 16 move a distance L1 relative to the initial position, the moving direction is the first direction, and the moving distance is M1, and the second adjusting rod 6 and the fourth adjusting rod 17 also move a distance L1 relative to the initial position, and the moving direction is the second direction opposite to the first direction. At this time, the deflection 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, wherein the first stirring blade 3 and the third stirring blade 12 rotate clockwise around the rotating column 31 as the rotating shaft, and the second stirring blade 4 and the fourth stirring blade 13 rotate counterclockwise around the rotating column 31 as the rotating shaft; or the first stirring blade 3 and the third stirring blade 12 rotate counterclockwise around the rotating column 31 as the rotating shaft, and the second stirring blade 4 and the fourth stirring blade 13 rotate clockwise around the rotating column 31 as the rotating shaft. For example, the first stirring blade 3 and the third stirring blade 12 rotate clockwise around the rotating column 31 by 60 degrees, 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, and the second stirring blade 4 and the fourth stirring blade 13 rotate counterclockwise around the rotating column 31 by 60 degrees, 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.

[0056] Reference Figure 9 The conveying directions of the first stirring blade 3 and the third stirring blade 12 are the same, the conveying directions of the second stirring blade 4 and the fourth stirring blade 13 are the same, the conveying directions of the first stirring blade 3 and the second stirring blade 4 are opposite, and the conveying directions of the third stirring blade 12 and the fourth stirring blade 13 are opposite, for example, please refer to Figure 9W1 or W2, the sludge is relatively transported between the adjacent stirring blades, for example, in the W1 state, the sludge at the first position C1 is transported to the adjacent second stirring blade 4 under the action of the first stirring blade 3, and the sludge at the second position C2 is transported to the previous first stirring blade 3 under the action of the second stirring blade 4, forming a convection between the adjacent stirring blades, which can enhance the stirring effect and improve the mixing effect. The transport speed difference between the first stirring blade 3 and the second stirring blade 4 and the transport speed difference between the third stirring blade 12 and the fourth stirring blade 13 is almost zero, so that the sludge is not axially transported as a whole, but only regional axial transport is formed between the first position C1 and the second position C2, thereby forming a single stirring state. The single stirring state is used for strong stirring and mixing between the sludge and the solidifying agent, and there is no one-way transport effect.

[0057] When the sludge solidification and mixing device is in the single stirring state, in order to reduce the adverse effects of the "weak stirring area" of 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 the positions 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 transport path of the stirring box 1, which can improve the stirring effect.

[0058] Before the single stirring state is implemented, the one-way transport stirring state is used for sludge transport, so that the sludge can be quickly distributed in the stirring box 1. When a small amount of sludge is mixed and solidified, this mode can be used. High-viscosity sludge needs strong shear force to break the agglomeration structure, and this mode can be used to form rapid and strong stirring and mixing.

[0059] The third state is a two-way differential transport stirring state, when the first adjusting rod 5 and the third adjusting rod 16 move a distance L1 relative to the initial position, the moving direction is the first direction, the second adjusting rod 6 and the fourth adjusting rod 17 move a distance L2 relative to the initial position, the moving direction is the second direction, and the first direction is opposite to the second direction. Reference Figure 10At 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 between 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 a bidirectional differential conveying and stirring state. In this stirring state, the sludge sequentially passes through a plurality of stirring zones such as a "strong stirring zone" between the C1 position and the C2 position and a "weak stirring zone" between the C2 position and the C3 position, and finally is discharged from the discharge port 103.

[0060] The bidirectional differential conveying and stirring state 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 high-speed rotation of the stirring shaft to form rapid stirring and mixing and conveying.

[0061] 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.

[0062] The fourth state is as follows: 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.

[0063] 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.

[0064] The above is only a preferred specific embodiment 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 replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A hazardous waste-containing sludge solidification mixing apparatus comprising a mixing tank and two mixing shafts located inside the mixing tank, a plurality of mixing blades being provided on the mixing shafts, characterized in that, The stirring shaft comprises rotating cylinders rotationally connected to the stirring box at both ends, 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 multiple stirring groups are uniformly arranged along the axial direction of the rotating cylinder; the stirring group formed by the first stirring blades is arranged at intervals with the stirring group formed by the second stirring blades, and the stirring group formed by the third stirring blades is arranged at intervals with the stirring group formed by the fourth stirring blades; The rotating cylinder is internally provided with multiple coupling structures, coaxial first adjusting rods, second adjusting rods, third adjusting rods and fourth adjusting rods, the coupling 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 located at 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 coupling structures, and the second stirring blades are connected with the second adjusting rods through second coupling structures; the third adjusting rods and the fourth adjusting rods are located at 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 coupling structures, and the fourth stirring blades are connected with the fourth adjusting rods through fourth coupling structures.

2. The hazardous waste-containing sludge solidification mixing apparatus according to claim 1, characterized by, The coupling structure comprises a connecting sleeve, an extension 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 through the extension rod, the connecting seat is rotationally 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 hazardous waste-containing sludge solidification mixing apparatus according to claim 2, characterized by, A plurality of mounting seats are fixedly arranged on the rotating cylinder, the positions and the number of the mounting seats correspond to the stirring blades, and the stirring blades are rotationally connected with the mounting seats through rotating columns.

4. The hazardous waste-containing sludge solidification mixing apparatus according to claim 3, characterized by, 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.

5. The hazardous waste-containing sludge solidification mixing apparatus according to claim 4, characterized by, The first function cylinder is used for driving the first adjusting rod to axially move, the second function cylinder is used for driving the second adjusting rod to axially move, the third function cylinder is used for driving the third adjusting rod to axially move, and the fourth function cylinder is used for driving the fourth adjusting rod to axially move.

6. The hazardous waste-containing sludge solidification mixing apparatus according to claim 5, wherein The first function cylinder and the second function cylinder are installed on the feeding side of the stirring box, and the third function cylinder is installed on the discharging side of the stirring box.

7. The hazardous waste-containing sludge solidification mixing apparatus according to claim 6, characterized by One end of the rotating cylinder extends out of the stirring box, and a gear is fixedly sleeved on the extending end of each of the two rotating cylinders, and the two gears are meshed.

8. The hazardous waste-containing sludge solidification mixing apparatus according to any one of claims 1 to 7, characterized by, A cover plate is arranged on the top of the stirring box, and a feeding port is arranged on the feeding end of the stirring box.

9. The hazardous waste-containing sludge solidification mixing apparatus according to claim 8, characterized by, A feeding pipe is arranged on the upper part of the stirring box.

10. The hazardous waste-containing sludge solidification mixing apparatus according to claim 9, wherein A discharging port is arranged on the bottom of the discharging end of the stirring box.

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