Mixer and cement air conveying chute pneumatic mixing system

Abstract

The utility model provides a pneumatic mixing system for a cement air conveying chute, which relates to the field of cement mixing and comprises a cement clinker powder air conveying chute with a plurality of feed ports, a mixer, a fan and a dust collector. A discharging hole of the cement clinker powder air conveying chute is communicated with a feeding hole of the mixer; the mixer comprises a shell with four side faces and a top face sealed, a feeding port and a discharging port are formed in the left side face and the right side face of the shell, a plurality of air chambers are arranged at the bottom of the shell, a breathable layer is arranged between each air chamber and the shell, an air outlet of an inflation pipe is aligned to the breathable layer and the interior of the shell, and a control valve is arranged on the inflation pipe. The shell is internally provided with at least one valve plate which moves up and down along the front and back surfaces of the shell, the valve plate is arranged at the upper part between the air chambers, the interior of the shell is divided into a plurality of mutually communicated mixing chambers by the valve plate, and the position and size of a communication port between the mixing chambers are switched through the valve plate; the mixer has the beneficial effects of less mechanical wear, energy consumption saving, realization of mixing of various materials and good effect.

Description

Technical Field

[0001] The utility model relates to the field of cement mixing, in particular to a mixer and a cement air conveying chute pneumatic mixing system. Background Art

[0002] The cement separate grinding process, that is, the clinker and gypsum are ground together to the specified index, and the mixed materials such as slag or fly ash are ground separately to their specified index, and then according to the index requirements of cement, the two are mixed in a certain proportion through a mixing device to form finished cement, which can improve the grinding efficiency, avoid over-grinding and under-grinding, increase production capacity, and reduce energy consumption. The existing mixing methods include mechanical mixing, pneumatic mixing, and pneumatic and mechanical composite mixing. Both mechanical mixers and pneumatic and mechanical composite mixers have the phenomenon of uneven mixing.

[0003] Patent ZL 200720102014.X discloses a pneumatic mixer, and patent CN201454472U discloses an energy-saving pneumatic mixer. These two pneumatic mixers have only one air inlet and feed inlet, and have the disadvantages of uneven distribution of air volume and air pressure, and limited feed types.

[0004] Patent No. 201210495129.5 discloses a horizontal mixer, including a machine body, a fan, a spiral reamer and a driving device for driving the spiral reamer to rotate. The machine body is divided into an air filling box and a mixing box by a horizontally arranged air permeable layer. The air filling box is divided into several small boxes by a partition. The fan is placed on one side of the machine body. The fan is connected to each small box through a pipeline. A pulse valve is provided on the pipeline connecting the fan and each small box. The spiral reamer is horizontally arranged in the mixing box, and a driving device for driving the spiral reamer to rotate is provided on one side of the machine body. Patent No.: 201220640658.5 discloses a horizontal mixer. The above-mentioned horizontal mixers all adopt a pneumatic homogenization separation inflation scheme and a spiral reamer driving structure. The spiral pushing structure not only makes the homogenization degree higher, but also makes the material discharge speed faster by setting multiple fans, greatly improving the product work effect.

[0005] We also used a separate inflation scheme and a spiral reamer drive structure in synergy. Through long-term use, we found that the material first entered the mixing box and then was stirred by the spiral reamer. Since the material is cement, slag, fly ash, etc., the spiral reamer is greatly worn. In addition, since it needs to be continuously stirred by a motor, the energy consumption is high. Moreover, since it is horizontal, the spiral reamer drive structure is separated from the inflation scheme, so it occupies a large area. Since there are multiple air outlets, the material discharge speed is increased, but the material mixing uniformity is also reduced. Therefore, a new mixer and cement air conveying chute pneumatic mixing system were developed. Summary of the invention

[0006] The utility model aims to provide a mixer and a cement air conveying chute pneumatic mixing system which can avoid wear, reduce energy consumption and have good mixing effect.

[0007] The technical solution of the utility model is:

[0008] A mixer, comprising a shell, wherein the four side surfaces and the top surface of the shell are sealed, the left and right side surfaces of the shell are respectively provided with a feed port and a discharge port, the bottom of the shell is sequentially provided with a plurality of air chambers from left to right, a breathable layer is provided between the air chambers and the shell, and a plurality of air chambers are respectively provided with an inflation tube, the air outlet of the inflation tube is aligned with the upper breathable layer and the inside of the shell, and a control valve is provided on the inflation tube; at least one valve plate that can move up and down along the front and back surfaces of the shell is provided in the shell, the valve plate is provided in the upper part between the air chambers, the valve plate divides the inside of the shell into a plurality of mixing chambers that are interconnected, and the position and size of the communication port between the mixing chambers are switched by the valve plate;

[0009] Furthermore, a windshield is provided between the air outlet of the inflation tube and the air permeable layer;

[0010] Furthermore, the conveying pipe runs through the feed inlet and the discharge port of the shell, and the conveying pipe has a downward inclination from the feed inlet to the discharge port. The lower half of the conveying pipe in the shell is hollowed out, so the material is conveyed to the inside of the shell;

[0011] A channel steel frame is provided on the top of the shell, a threaded rod is threadedly connected to the channel steel frame and the top surface of the shell, the bottom of the threaded rod is rotatably connected to the top of the valve plate, two slideways are provided in the shell, and the valve plate is further driven to slide up and down along the slideways by rotating the threaded rod;

[0012] Furthermore, the rotational connection between the threaded rod and the valve plate includes but is not limited to a bearing connection or a shaft connection or a connection via a rotary joint, as long as the threaded rod can drive the valve plate to move up and down along the slideway and the valve plate will not rotate due to the left and right limit of the slideway;

[0013] The threaded rod can be rotated by electric drive or manual drive. When driven by electric drive, a motor can be used to drive the threaded rod to rotate. When driven manually, a handle is provided at the top of the threaded rod or a screw lift is provided on the channel steel frame. The screw lift includes a threaded rod, and the threaded rod is driven to rise and fall by rotating the valve of the screw lift.

[0014] Furthermore, a mixing chamber is formed in the shell at the top of each of the two air chambers, and the size of the wind is controlled by a control valve, so that circulating wind is further formed in the mixing chamber; further, the air supply sizes of the two air chambers at the bottom of each mixing chamber are different, the air supply volume of the left inflation pipe is smaller than that of the right inflation pipe, and there is always a distance between the valve plate and the air permeable layer between the mixing chambers, and the valve plate divides the feed pipe into multiple sections;

[0015] Furthermore, the length of the windshield is at least 10 cm longer than the diameter of the air tube, and the windshield is at least 10 cm longer than the diameter of the air tube, and the windshield is 3-10 cm away from the upper and lower air permeable layers and the air tube; preferably, the windshield is 5 cm away from the upper and lower air permeable layers and the air tube;

[0016] Preferably, the mixer comprises four air chambers and two mixing chambers;

[0017] An inspection door is provided on the left side of the shell near the bottom of the shell, and a slag discharge port is provided on the front side of the shell near the bottom of the shell;

[0018] A cement air conveying chute pneumatic mixing system, comprising a cement clinker powder air conveying chute, a mixer, a fan and a dust collector; the discharge port of the cement clinker powder air conveying chute is connected with the feed port of the mixer, the air outlet of the fan is connected with a plurality of air charging pipes through an air duct, a dust collecting port is provided on the top of the mixer, and the dust collecting port is connected with the dust collector through a pipeline;

[0019] Furthermore, a feed port is provided on one side of the cement clinker powder air conveying chute, and a plurality of feed ports are provided in the length direction of the cement clinker powder air conveying chute, and the number of the feed ports is determined according to the type of the mixed material;

[0020] Further, the blower adopts a Roots blower;

[0021] Further, the dust collector is connected to a dust collecting fan;

[0022] The advantages and positive effects of the utility model are:

[0023] The present application only uses pneumatic mixing to avoid the mechanical wear problem caused by spiral reamer mixing, and since mechanical mixing is no longer performed, energy consumption is reduced. Taking four air chambers as an example, the inside of the shell is divided into two mixing chambers by a valve plate, and the two mixing chambers are connected up and down. Two inflation tubes are provided at the bottom of each mixing chamber. The two inflation tubes are controlled by a control valve to have different inflation amounts, one large and one small, thus forming a circulating wind. After the high-pressure airflow of the fan enters the air chamber, it passes through the air-permeable layer into the shell to make the material in a boiling state, and the material is mixed for the first time. After the mixing chamber on the left is fully mixed, the height of the valve plate is adjusted to allow the material to enter the mixing chamber on the right. Under the action of the high-pressure airflow, the material is in a boiling state. The material is mixed again in the mixing chamber on the right, so the mixing effect is good.

[0024] The wind shield can disperse the compressed air, prevent the compressed air from blowing directly into the breathable layer, disperse the gas more evenly, and avoid the material from falling directly into the inlet area of ​​the inflation pipe to block the exhaust port. By controlling the length of the wind shield to be at least 10 cm longer than the diameter of the inflation pipe, and the wind shield to be 5 cm away from the upper and lower breathable layers and the inflation pipe, the circulating air mixing effect formed under this condition is good.

[0025] Since the conveying pipe is inclined downward from the feed port to the discharge port, it is convenient for materials to enter and discharge.

[0026] The airflow direction and material mixing time are controlled by adjusting the position of the valve plate. When the material can enter the next mixing chamber, the valve plate is adjusted downward, and the material further enters the next mixing chamber from the upper space. The valve plate can prevent the material from entering the next mixing chamber after being mixed in the mixing chamber for a period of time.

[0027] The inspection door is convenient for checking internal faults. A slag discharge port is set on the side of the shell, and the accumulated cement is discharged from the slag discharge port. The air flow passes through the gate valve and enters the dust collector through the dust collecting port for purification and discharge.

[0028] Since there are multiple feed ports on the cement clinker powder air conveying chute, the number of the feed ports is determined according to the type of mixed materials, thus meeting the mixing needs of multiple and different materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a process flow chart of a cement air conveying chute pneumatic mixing system of the utility model.

[0030] Figure 2 This is the main view of the mixer.

[0031] Figure 3 It is a side view of the mixer.

[0032] Figure 4 It is a cross-sectional view of a mixer.

[0033] Figure 5 It is a top view of the mixer.

[0034] Figure 6 Schematic diagram of the slide and threaded rod.

[0035] In the figure:

[0036] 1. Shell 2. Air chamber 3. Breathable layer

[0037] 4. Inflatable pipe 5. Control valve 6. Valve plate

[0038] 7. Wind shield 8. Feed pipe 9. Inspection door

[0039] 10. Slag discharge port 11. Cement clinker powder air conveying chute 12. Fan

[0040] 13. Dust collector 14. Dust collecting port 15. Channel steel frame

[0041] 16. Air duct 17. Threaded rod 18. Slide

[0042] 19. Valve 20. Screw lift DETAILED DESCRIPTION

[0043] This embodiment is a cement air conveying chute pneumatic mixing system, such as Figure 1 As shown, it includes a cement clinker powder air conveying chute 11, the mixer, a Roots blower 12 and a dust collector 13; the discharge port of the cement clinker powder air conveying chute 11 is connected to the feed port of the mixer, the air outlet of the blower 12 is connected to four air charging pipes 4 through an air duct 16, and a dust collecting port 14 is provided on the top of the mixer, and the dust collecting port 14 is connected to the dust collector 13 through a pipeline, and the dust collector 13 is connected to the dust collecting blower 12;

[0044] Among them, Figure 1 As shown, a feed port is provided on one side of the cement clinker powder air conveying chute 11, and three feed ports are sequentially provided in the length direction of the cement clinker powder air conveying chute 11;

[0045] Wherein, the mixer, such as Figure 2-Figure 5 As shown, it includes a housing 1, the four sides and the top of the housing 1 are sealed, as shown in FIG. Figure 1 As shown, the left and right sides of the shell 1 are respectively provided with a feed port and a discharge port, the delivery pipe 8 penetrates the feed port and the discharge port of the shell 1, and the delivery pipe 8 is inclined downward from the feed port to the discharge port. The lower half of the delivery pipe 8 in the shell 1 is hollowed out, so that the material can be transported to the inside of the shell 1 later; the bottom of the shell 1 is provided with four air chambers 2 from left to right, as shown in FIG. Figure 4As shown, a breathable layer 3 is provided between the air chamber 2 and the shell 1, and the breathable layer 3 can transfer the high-pressure air of the air chamber 2 to the shell 1. An air filling tube 4 is provided in each of the four air chambers 2. The air outlet of the air filling tube 4 is aligned with the upper breathable layer 3 and the inside of the shell 1. A control valve 5 is provided on the air filling tube 4. A windshield 7 is provided between the air outlet of the air filling tube 4 and the breathable layer 3. The length of the windshield 7 is 10 cm longer than the diameter of the air filling tube 4, and the windshield 7 is 5 cm away from the upper and lower breathable layers 3 and the air filling tube 4. The windshield 7 can The compressed air is dispersed to prevent the compressed air from blowing directly into the air-permeable layer 3, so that the gas can be dispersed more evenly, and the material is prevented from directly falling into the inlet area of ​​the inflation tube 4 and blocking the exhaust port; a valve plate 6 is provided in the shell 1 and can move up and down along the front and back surfaces of the shell 1, and the valve plate 6 is arranged in the shell 1 at the upper part between the air chambers 2 and the air chambers 2, and the valve plate 6 divides the shell 1 into two mutually connected mixing chambers, that is, the upper and lower parts of the two mixing chambers are connected, and the top of the valve plate 6 has a certain distance from the shell 1, such as Figure 4 As shown, the bottom of the valve plate 6 is at a certain distance from the frame of the slideway 18, and the frame of the slideway 18 divides the two air chambers 2 and does not communicate with each other. The position and size of the communication port between the mixing chambers are switched by the valve plate 6. By raising the position of the valve 19, the distance between the top of the valve plate 6 and the shell 1 becomes smaller, and the distance between the bottom of the valve plate 6 and the frame becomes larger. An inspection door 9 is provided on the left side of the shell 1 near the bottom of the shell 1, and a slag discharge port 10 is provided on the front of the shell 1 near the bottom of the shell 1;

[0046] The valve plate 6 is adjusted by the following settings to further switch the position and size of the communication port between the mixing chambers:

[0047] The top of the housing 1 is provided with a channel steel frame 15, the threaded rod 17 penetrates the channel steel frame 15 and the top surface of the housing 1, and the threaded rod 17 is further threadedly connected with the channel steel frame 15 and the top surface of the housing 1, and the bottom of the threaded rod 17 is connected to the top of the valve plate 6 through a bearing, such as Figure 6 The threaded rod 17 is connected to a handle at the top, and two slideways 18 are provided in the housing 1. By rotating the threaded rod 17, the threaded rod 17 drives the valve plate 6 to slide up and down along the slideways 18. Due to the limiting effect of the slideways 18, the valve plate 6 will not rotate.

[0048] Under the above conditions, if Figure 2-5 As shown, cement clinker powder and other three types of materials are weighed and metered, mixed through four feed ports of the cement clinker powder air conveying chute 11, and then enter the mixer.

[0049] The high-pressure airflow generated by the Roots-type blower 12 enters the four air chambers 2 of the mixer through the air duct 16 and the inflation tube 4 respectively. Further, the Roots-type blower 12 increases the pressure by 19.8 KPa. During this process, the wind shield 7 can disperse the compressed air to prevent the compressed air from blowing directly into the breathable layer 3, disperse the gas more evenly, and prevent the material from falling directly into the inlet area of ​​the inflation tube 4 to block the exhaust port. The compressed air passes through the breathable layer 3 and enters the two mixing chambers respectively, so that the materials in the mixing chamber and the mixing chamber are in a boiling state. During this process, the size of the wind is controlled by the control valve 5 to further form circulating wind in the mixing chamber. The air supply of the two air chambers 2 at the bottom of each mixing chamber is different in size. The air supply of the inflation tube 4 on the left is smaller than that of the air supply of the inflation tube 4 on the right, and the There is always a distance between the valve plate 6 and the air permeable layer 3 between the mixing chambers, and the connecting port between the top of the valve plate 6 and the shell 1 is smaller than the connecting port between the bottom of the valve plate 6 and the slide 18. Therefore, the material is blocked by the valve 19 in the mixing chamber on the left and is mixed for a longer period of time. Since the two mixing chambers are connected to each other, the gas in the mixing chamber on the right enters the mixing chamber on the left through the two connecting ports. Combined with the large and small air volumes of the two inflation tubes 4, circulating wind is formed to fully mix the materials, so that the materials can be mixed evenly. When the mixing is sufficient, the threaded rod 17 is further driven downward by twisting the handle, and the material enters the mixing chamber on the right through the connecting port between the top of the valve plate 6 and the shell 1 and is discharged again through the discharge port after mixing. Therefore, the material is mixed well and the discharge speed is fast.

[0050] According to the needs, the number of the air chamber 2 and the mixing chamber can be adjusted to set different sizes of cement air conveying chute pneumatic mixing systems to further meet the mixing needs of different amounts of different types of materials. The cement air conveying chute pneumatic mixing system adopts pure pneumatic mixing to avoid the mechanical wear problem caused by spiral reamer mixing. And because mechanical mixing is no longer performed, the traditional cement air conveying chute pneumatic mixing system generally has four motors, and the energy consumption of one motor is about 4-5 kilowatts. This system does not use a motor, thereby reducing energy consumption. The inspection door 9 is convenient for checking internal faults. A slag discharge port 10 is set on the side of the shell 1, and the accumulated cement is discharged from the slag discharge port 10. After the airflow passes through the gate valve, it enters the dust collector 13 through the dust collecting port 14 for purification and discharge.

[0051] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0052] The above is a detailed description of an embodiment of the utility model, but the content is only a preferred embodiment of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of patent coverage of the utility model.

Claims

1. A mixer, comprising a housing, characterized in that: The four side surfaces and the top surface of the shell are sealed, and the left and right sides of the shell are respectively provided with a feed port and a discharge port, and a plurality of air chambers are sequentially provided at the bottom of the shell from left to right, and a breathable layer is provided between the air chamber and the shell, and inflation tubes are respectively provided in the plurality of air chambers, and the air outlets of the inflation tubes are aligned with the upper breathable layer and the inside of the shell, and a control valve is provided on the inflation tubes; at least one valve plate that moves up and down along the front and back surfaces of the shell is provided in the shell, and the valve plate is arranged at the upper part between the air chambers, and the valve plate divides the shell into a plurality of mixing chambers that are interconnected, and the position and size of the connecting ports between the mixing chambers are switched by the valve plate.

2. A mixer according to claim 1, characterized in that: A windshield is provided between the air outlet of the inflation tube and the air permeable layer.

3. A mixer according to claim 2, characterized in that: The conveying pipe runs through the feed inlet and the discharge port of the shell, and the conveying pipe is inclined downward from the feed inlet to the discharge port. The lower half of the conveying pipe in the shell is hollowed out, so the material is transported to the inside of the shell.

4. A mixer according to any one of claims 1 to 3, characterized in that: A channel steel frame is provided on the top of the shell, and the threaded rod is threadedly connected to the channel steel frame and the top surface of the shell. The bottom of the threaded rod is rotatably connected to the top of the valve plate. Two slideways are provided in the shell, and the valve plate is further driven to slide up and down along the slideways by rotating the threaded rod.

5. A mixer according to claim 4, characterized in that: The rotational connection between the threaded rod and the valve plate includes a bearing connection, a rotating shaft connection, or a rotation joint connection; The threaded rod is rotated by electric drive or manual drive. When manually driven, a handle is provided on the top of the threaded rod or a screw lift is provided on the channel steel frame. The screw lift includes a threaded rod, and the threaded rod is driven to rise and fall by rotating the valve of the screw lift.

6. A mixer according to claim 5, characterized in that: The housing on top of each of the two air chambers is a mixing chamber; The length of the windshield is at least 10 cm longer than the diameter of the inflation tube, and the windshield is 3-10 cm away from the upper and lower air permeable layers and the inflation tube.

7. A mixer according to claim 6, characterized in that: The mixer comprises four air chambers and two mixing chambers; An inspection door is provided on the left side of the shell near the bottom of the shell, and a slag discharge port is provided on the front side of the shell near the bottom of the shell.

8. A cement air conveying chute pneumatic mixing system, characterized by: It comprises a cement clinker powder air conveying chute, a mixer as described in any one of claims 1 to 7, a fan and a dust collector; the discharge port of the cement clinker powder air conveying chute is connected with the feed port of the mixer, the air outlet of the fan is connected to a plurality of inflation pipes through an air duct, a dust collecting port is provided on the top of the mixer, and the dust collecting port is connected to the dust collector through a pipeline.

9. A cement air conveying chute pneumatic mixing system according to claim 8, characterized in that: A feed inlet is arranged on one side of the cement clinker powder air conveying chute, and a plurality of feed inlets are arranged in the length direction of the cement clinker powder air conveying chute.

10. A cement air conveying chute pneumatic mixing system according to claim 9, characterized in that: The fan is a Roots blower; the dust collector is connected to the dust collecting fan.

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