A multi-axis composite mixer for mine backfilling

Abstract

The present invention discloses a multi-axis composite mixer for mine filling, which comprises a tank body, a feed inlet arranged at the upper part of one side of the tank body, and a discharge outlet arranged at the lower part of the other side of the tank body. A first stirring zone, a second stirring zone and a third stirring zone are sequentially arranged on the tank body from the side of the feed inlet to the side of the discharge outlet. An overflow device is installed inside the tank body above the discharge outlet. This composite mixer has a wide adaptability, can adapt to most materials such as slurries and pastes, will not cause the problem of liquid leakage at the ends, has extremely low equipment maintenance volume, is reliable and durable, and has a good stirring effect.

Description

Technical Field

[0001] The present invention belongs to the field of processing equipment for mine filling, and particularly relates to a multi-axis compound mixer for mine filling. Background Art

[0002] The mine filling method is to fill the mined - out area with filling materials to support the surrounding rocks on both sides, prevent rock movement, and achieve the purpose of controlling ground pressure. Any method that gradually fills the mined - out area with filling materials as the mining face advances is called the filling mining method. The filling mining method aims to use the filling body for ground pressure management, inhibit surface subsidence and surrounding rock caving, and protect the ecological environment balance of the mining site. From the perspective of materials, the filling mining method can be divided into three types: cemented filling method, hydraulic - sand filling method, and dry filling method. The dry filling method is the earliest applied method in filling mining technology. It is necessary to use wind power, mine cars or other transportation facilities to transport dry filling materials such as sand, gravel, and waste rock to the mined - out area by mechanical transportation. The ore mined by this method accounts for more than 1 / 3 of the total ore; the hydraulic - sand filling method is to transport solid - liquid two - phase slurries such as smelting furnace slag, tailings, crushed stones, and sand to the underground by using mortar or self - flowing method. When applying this method, the stability of the surrounding rock and ore body, the size of the mining roadway, and the possibility of surface subsidence should be fully considered. The cemented filling method is the latest developed filling technology. This method can form slurries or pastes of materials and transport them to the filling area by pipeline pumping or gravity transportation, with the advantages of simple process, high strength of filling materials, fast filling speed, and large filling volume.

[0003] Currently, vertical mixing tanks or twin - shaft mixers are commonly used for making pulp in the cemented filling method. When configuring mixing equipment for different mine filling projects, vertical mixing tanks or twin - shaft mixers are generally selected according to the properties of filling raw materials and the concentration requirements of filling slurries. The rotation speed of the vertical mixing tank is much higher than that of the twin - shaft mixer. Within a certain range of conditions, the mixing efficiency of the vertical mixing tank is higher than that of the twin - shaft mixer. However, the structure and discharging method of the vertical mixing tank are not suitable for the mixing of paste - like slurries, nor for the mixing and discharging of coarse - aggregate pulp. Although the twin - shaft mixer has low mixing efficiency, its body structure is suitable for making and discharging pulp with higher concentration and coarser aggregate, but the problem of slurry leakage at the shaft end of the twin - shaft mixer has always been a difficult problem in the industry, so it is very difficult to achieve a balance between the vertical mixing tank and the twin - shaft mixer. Summary of the Invention

[0004] The present invention provides a multi - axis compound mixer for mine filling. The use of this equipment is suitable for the mixing of various different types of filling materials, with high mixing efficiency and strong adaptability.

[0005] To achieve the above object, the present invention provides the following technical solution: A multi-axis compound mixer for mine filling, comprising a tank body, a feed inlet arranged at the upper part of one side of the tank body, and a discharge outlet arranged at the lower part of the other side of the tank body (1). A first stirring zone, a second stirring zone, and a third stirring zone are sequentially arranged on the tank body from the feed inlet side to the discharge outlet side.

[0006] Preferably, an overflow device is installed inside the tank body above the discharge outlet.

[0007] Preferably, the overflow device divides the discharge outlet into a bottom discharge outlet and an overflow discharge outlet.

[0008] Preferably, the discharge amount of the overflow discharge outlet is greater than or equal to the feed amount of the feed inlet, and the feed amount of the feed inlet is greater than or equal to the discharge amount of the bottom discharge outlet.

[0009] Preferably, a bottom plate is installed inside the bottom of the tank body, and one end of the bottom plate close to the feed inlet is higher than the end of the discharge outlet.

[0010] Preferably, the first stirring zone includes a first stirring motor arranged outside the tank body, and the first stirring motor is connected to a first stirring shaft inside the tank body; the second stirring zone includes a second stirring motor arranged outside the tank body, and the second stirring motor is connected to a second stirring shaft inside the tank body; the third stirring zone includes a third stirring motor arranged outside the tank body, and the third stirring motor is connected to a third stirring shaft inside the tank body.

[0011] Preferably, three layers of stirring blades with a folded leaf structure are installed outside the first stirring shaft and are distributed up and down. The folded leaf angle is 15 degrees. The uppermost stirring blade is of a downward pressing structure, and the lower two layers of stirring blades are of an upward turning structure.

[0012] Preferably, two layers of stirring blades with an Archimedean curve shape are installed outside the second stirring shaft and are distributed up and down. The upper stirring blade is of a downward pressing structure, and the lower stirring blade is of an upward turning structure.

[0013] Preferably, two layers of stirring blades with a spoke structure are installed outside the third stirring shaft and are distributed up and down. The upper stirring blade is of a downward pressing structure, and the lower stirring blade is of an upward turning structure.

[0014] Preferably, the stirring speed of the first stirring motor is 120 r / min, the stirring speed of the second stirring motor is 240 r / min, and the stirring speed of the third stirring motor is 340 r / min.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. Compared with the horizontal mixers commonly used in previous filling projects, the multi-axis compound mixer completely avoids the industry problem of easy slurry leakage at the shaft ends of horizontal mixers and can replace the previous double-stage horizontal mixers. Moreover, the high-speed vertical shaft mixing device can ensure uniform mixing and sufficient activation. Using this multi-axis compound mixer can greatly save civil engineering and equipment investment, is convenient for maintenance, and has higher reliability. The multi-axis compound mixer can adapt to the vast majority of filling materials, representing an innovation and progress in the form of filling mixing;

[0017] 2. Constant material level. The self-flow filling system of this mixer can be installed without a level gauge and a pipe clamp valve, and the control is simple;

[0018] 3. Wide adaptability, adapting to the vast majority of materials such as slurries and pastes;

[0019] 4. Reliable, durable and low failure rate. Compared with horizontal mixers, there is no slurry leakage failure at the shaft ends, the equipment maintenance volume is extremely low, and it is reliable and durable.

[0020] Other features and advantages of the present disclosure will become clear through the following detailed description of the exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or related technologies, the following will briefly introduce the drawings required to be used in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only the embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can also be obtained based on the provided drawings without creative efforts.

[0022] Figure 1 is the main perspective view of the multi-axis compound mixer of the present invention;

[0023] Figure 2 is the top perspective view of the multi-axis compound mixer of the present invention;

[0024] Figure 3 is the enlarged view of the first mixing shaft of the present invention;

[0025] Figure 4 is the top view of the blades of the first mixing shaft of the present invention;

[0026] Figure 5 is the enlarged view of the second mixing shaft of the present invention;

[0027] Figure 6 is the top view of the blades of the second mixing shaft of the present invention;

[0028] Figure 7 is the enlarged view of the third mixing shaft of the present invention;

[0029] Figure 8 is the top view of the blades of the third mixing shaft of the present invention;

[0030] Figure 9 This is a partial view of the overflow device of the present invention;

[0031] In the figure: 1. Tank body, 2. Feed inlet, 3. Discharge outlet, 4. First stirring zone, 5. Second stirring zone, 6. Third stirring zone, 7. Overflow device, 8. Bottom plate, 31. Bottom discharge outlet, 32. Overflow discharge outlet, 41. First stirring motor, 42. First stirring shaft, 51. Second stirring motor, 52. Second stirring shaft, 61. Third stirring motor, 62. Third stirring shaft. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] Unless otherwise specifically stated, the relative arrangements, numerical expressions and values of the components and steps described in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for the sake of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0034] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations during use or operation in addition to the orientation described in the figure for the device. For example, if the device in the attached drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the spatial relative descriptions used here.

[0035] Please refer to Figures 1-9 , the present invention provides a technical solution: a multi-axis compound mixer for mine filling, including a tank body 1, a feed inlet 2 arranged on the upper part of one side of the tank body 1, and a discharge outlet 3 arranged on the lower part of the other side of the tank body 1. A first stirring zone 4, a second stirring zone 5, and a third stirring zone 6 are sequentially arranged on the tank body 1 from the side of the feed inlet 2 to the side of the discharge outlet 3.

[0036] The mixer tank body can be set into various structural shapes. The optimal choice is to set it as a cuboid with a basic structure and a semi-circular bottom. The length of the stirring tank body is set as the sum of the lengths of three stirring zones (the first stirring zone 4, the second stirring zone 5, and the third stirring zone 6), the feed inlet 2, and the discharge outlet 3. The width is set as the width of one stirring zone. Inside the stirring tank body 1, in cooperation with the three stirring zones, the residence time of the material in the tank body is maintained at 3 - 3.5 minutes.

[0037] An overflow device 7 is installed on the upper part of the discharge outlet 3 inside the tank body.

[0038] The overflow device 7 is a partition plate closely attached to the inner side of the tank body, dividing the upper part of the discharge outlet 3 into two parts. And there is enough space between the upper part of the overflow device 7 and the top of the tank body to form an overflow channel.

[0039] The overflow device 7 divides the discharge outlet 3 into a bottom discharge outlet 31 and an overflow discharge outlet 32.

[0040] After the material is stirred in the three stirring zones, it first discharges through the bottom discharge outlet 31, and at the same time, the feed inlet 2 feeds the material. When the feeding speed of the feed inlet 2 is greater than the discharging speed of the bottom discharge outlet 31, the liquid level of the material continuously rises from the overflow device 7 until it reaches the overflow channel. The excessive material crosses the overflow channel and flows out from the overflow discharge outlet 32.

[0041] The discharge amount of the overflow outlet 32 is greater than or equal to the feed amount of the feed inlet 2, and the feed amount of the feed inlet 2 is greater than or equal to the discharge amount of the bottom outlet 31.

[0042] Assume that the feeding speed of the feed inlet 2 of the mixer is (X) m³ / h, and the discharge amount of the bottom outlet 31 is calculated and selected to be less than (X) m³ / h. In this way, after a period of time, the liquid level will gradually rise. When the liquid level rises to a certain height and reaches the specified liquid level (the top of the overflow device), the slurry will continue to discharge through the upper overflow channel, and the liquid level is balanced through the bottom discharge and the overflow discharge. The maximum discharge amount of the overflow pipe is greater than (X) m³ / h, ensuring that the slurry will not overflow from the tank due to insufficient discharge amounts of the bottom discharge and the overflow discharge.

[0043] A bottom plate 8 is installed on the inner side of the bottom of the tank body 1. One end of the bottom plate 8 close to the feed inlet 2 is higher than one end of the discharge outlet 3. There is a certain downward slope from the feed end to the discharge end, and it is appropriate to be inclined downward by about 1 degree.

[0044] The first stirring zone 4 includes a first stirring motor 41 arranged outside the tank body 1, and the first stirring motor 41 is connected to a first stirring shaft 42 inside the tank; the second stirring zone 5 includes a second stirring motor 51 arranged outside the tank body 1, and the second stirring motor 51 is connected to a second stirring shaft 52 inside the tank; the third stirring zone 6 includes a third stirring motor 61 arranged outside the tank body 1, and the third stirring motor 61 is connected to a third stirring shaft 62 inside the tank.

[0045] The mixer adopts multi-axis vertical stirring, and is equipped with three groups of stirring motors and stirring shafts. It adopts a cantilever structure and evenly arranges three stirring units.

[0046] Three layers of stirring blades with a folded leaf structure are installed outside the first stirring shaft 42 and are distributed up and down. The folded leaf angle is 15 degrees. The uppermost stirring blade is of a downward pressing structure, and the lower two layers of stirring blades are of an upward turning structure. This stirring structure premixes the materials.

[0047] Two layers of stirring blades with an Archimedean curve shape are installed outside the second stirring shaft 52 and are distributed up and down. The upper stirring blade is of a downward pressing structure, and the lower stirring blade is of an upward turning structure. This stirring structure fully stirs the materials and is the full stirring area.

[0048] Two layers of stirring blades with a spoke structure are installed outside the third stirring shaft 62 and are distributed up and down. The upper stirring blade is of a downward pressing structure, and the lower stirring blade is of an upward turning structure. This stirring area is the full activation stirring area.

[0049] The mixer is divided into three areas: pre - mixing, full - stirring, and high - speed activation through three groups of blade designs with different stirring areas and different rotational speed settings. First, the folded blades are used to pre - mix the materials, then the spiral Archimedean curve blades on the second shaft are used to stir the materials, and finally the spoke - type blades are used to fully and highly activate the materials at high speed.

[0050] The stirring speed of the first stirring motor 41 is 120 r / min, the stirring speed of the second stirring motor 51 is 240 r / min, and the stirring speed of the third stirring motor 61 is 340 r / min.

[0051] The different stirring speeds are set to cooperate with different stirring paddles and their specific stirring functions to achieve the purpose of uniform stirring and rapid discharging. Moreover, the traditional mixer is prone to form eddies, which is not conducive to the stirring of materials, while between adjacent stirring devices of the multi - shaft composite mixer, the materials can collide with each other, which is more conducive to improving the stirring effect.

[0052] The gap between the stirring blades and the side wall of the tank body is set to be less than 50 mm, which is more conducive to the stirring and mixing of materials, and the stirring effect is better than that of the traditional mixer with the stirring blades more than 500 mm away from the tank body.

[0053] Example 1:

[0054] According to the present invention, three stirring areas are set. The first stirring area 4 is set with a three - layer folded - blade structure, where the uppermost layer is a downward - pressing structure, and the stirring blades of the lower two layers are upward - turning structures; the second stirring area 5 is set with two - layer Archimedean - curve - type stirring blades, the upper layer is a downward - pressing structure, and the lower layer is an upward - turning structure; the third stirring area 6 is set with two - layer spoke - type structure stirring blades, the upper - layer stirring blades are downward - pressing structures, and the lower - layer stirring blades are upward - turning structures. An overflow device 7 is set at the discharge port. And the stirring speed of the first stirring shaft 42 is set to be 120 r / min, the stirring speed of the second stirring shaft 52 is 240 r / min, and the stirring speed of the third stirring shaft 62 is 340 r / min.

[0055] Comparative Example 1:

[0056] The positions of the first stirring area 4 and the second stirring area 5 are swapped, and the stirring speed remains unchanged, and the others are the same as in Example 1.

[0057] Comparative Example 2:

[0058] The blades of the first stirring area 4 are changed to two layers, and the others are the same as in Example 1.

[0059] Comparative Example 3:

[0060] The blades of the first stirring area 4 are changed to four layers, and the others are the same as in Example 1.

[0061] Comparative Example 4:

[0062] Mixing is carried out using a traditional vertical single-shaft mixing barrel, and the feeding speed is the same as that in Example 1.

[0063] Comparative Example 5:

[0064] Mixing is carried out using a traditional horizontal double-shaft mixer, and the feeding speed is the same as that in Example 1.

[0065]

[0066] As can be seen from the above table, the multi-shaft composite mixer generally has better mixing effects than ordinary vertical mixers and double-shaft horizontal mixers. Considering other comparative examples, in terms of residence time (mixing efficiency), mixing uniformity, and energy consumption, the combined setting of the present invention has the best effect and the strongest applicability.

[0067] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-axis composite mixer for mine filling, comprising a tank body (1), a feed inlet (2) arranged at the upper part on one side of the tank body (1), and a discharge outlet (3) arranged at the lower part on the other side of the tank body (1), characterized in that: On the tank body (1), a first stirring zone (4), a second stirring zone (5) and a third stirring zone (6) are sequentially arranged from the side of the feed inlet (2) to the side of the discharge outlet (3); an overflow device (7) is installed inside the tank body above the discharge outlet (3); the overflow device (7) divides the discharge outlet (3) into a bottom discharge outlet (31) and an overflow discharge outlet (32); the discharge amount of the overflow discharge outlet (32) is greater than or equal to the feed amount of the feed inlet (2), and the feed amount of the feed inlet (2) is greater than or equal to the discharge amount of the bottom discharge outlet (31); the first stirring zone (4) includes a first stirring motor (41) arranged outside the tank body (1), and the first stirring motor (41) is connected to a first stirring shaft (42) inside the tank body; the second stirring zone (5) includes a second stirring motor (51) arranged outside the tank body (1), and the second stirring motor (51) is connected to a second stirring shaft (52) inside the tank body; the third stirring zone (6) includes a third stirring motor (61) arranged outside the tank body (1), and the third stirring motor (61) is connected to a third stirring shaft (62) inside the tank body; the three groups of stirring areas with different blade designs and different rotational speed settings divide the mixer into three areas: pre-mixing, full stirring and high-speed activation; three layers of stirring blades with a folded leaf structure are installed outside the first stirring shaft (42) and are distributed up and down, the folded leaf angle is 15 degrees, the uppermost stirring blade is of a downward pressing structure, and the lower two layers of stirring blades are of an upward turning structure; two layers of stirring blades with an Archimedean curve shape are installed outside the second stirring shaft (52) and are distributed up and down, the upper layer of stirring blades is of a downward pressing structure, and the lower layer of stirring blades is of an upward turning structure; two layers of stirring blades with a spoke structure are installed outside the third stirring shaft (62) and are distributed up and down, the upper layer of stirring blades is of a downward pressing structure, and the lower layer of stirring blades is of an upward turning structure; the stirring rotational speed of the first stirring motor (41) is 120 r / min, the stirring rotational speed of the second stirring motor (51) is 240 r / min, and the stirring rotational speed of the third stirring motor (61) is 340 r / min.

2. The multi-axis composite mixer for mine filling according to claim 1, wherein: A bottom plate (8) is installed inside the bottom of the tank body (1), and one end of the bottom plate (8) close to the feed inlet (2) is higher than one end of the discharge outlet (3).

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