A grinding aid injection device for a coal ash mill

Abstract

The application relates to the field of fly ash mills, in particular to a grinding aid injection device for a fly ash mill, which comprises a mill grinding cylinder and an injection structure, the mill grinding cylinder contains fly ash inside and is provided with a mounting through hole; the injection structure comprises a gas supply pump, a grinding aid conveying pump and an atomizing nozzle, the gas supply pump and the grinding aid conveying pump are located outside the mill grinding cylinder and are respectively communicated with the atomizing nozzle, the gas supply pump injects gas into the atomizing nozzle, the grinding aid conveying pump injects grinding aid into the atomizing nozzle, and the atomizing nozzle penetrates the mounting through hole and faces the mill grinding cylinder. The application realizes efficient atomization injection of the grinding aid, effectively prevents fly ash from being agglomerated, and ensures stable and reliable operation of the device.

Description

Technical Field

[0001] This application relates to the field of fly ash mills, and in particular to a grinding aid injection device for fly ash mills. Background Technology

[0002] In the process of fly ash preparation, in order to improve grinding efficiency and product quality, a small amount of grinding aid is usually added to the fly ash. The grinding aid is mostly in liquid form, and its addition amount is generally about one-thousandth of the total mass of fly ash. However, in actual operation, due to the extremely small size of fly ash particles, the traditional dripping method will lead to insufficient mixing of grinding aid and fly ash, which easily forms agglomeration and seriously affects the performance of the final product.

[0003] The most common practice is to introduce the grinding aid into the fly ash material flow in the form of dripping through simple pipes. Although this method is inexpensive and relatively simple in design, it cannot guarantee that the liquid grinding aid will be well distributed throughout the working area. Secondly, it is very troublesome to repair when the pipes are blocked or damaged, because in most cases these pipe conveying components are integrated into the main unit in hard-to-reach locations. Utility Model Content

[0004] The purpose of this application is to overcome the above-mentioned technical problems and provide a grinding aid injection device for fly ash mills.

[0005] A grinding aid injection device for a fly ash mill includes:

[0006] A mill grinding cylinder, internally containing fly ash, the mill grinding cylinder including mounting through holes, and...

[0007] The injection structure includes an air supply pump, a grinding aid delivery pump, and an atomizing nozzle. The air supply pump and the grinding aid delivery pump are located outside the grinding cylinder of the mill and are respectively connected to the atomizing nozzle. The air supply pump injects gas into the atomizing nozzle, and the grinding aid delivery pump injects grinding aid into the atomizing nozzle. The atomizing nozzle faces the grinding cylinder of the mill and passes through the mounting through hole.

[0008] By adopting the above scheme, when the grinding aid is injected into the fly ash mill, the grinding aid delivery pump can quantitatively inject the grinding aid into the atomizing nozzle, and the air supply pump inputs gas into the atomizing nozzle, thereby spraying the grinding aid out from the atomizing nozzle. The atomizing nozzle converts the grinding aid into a mist, so that it can fully contact the fly ash in the mill grinding cylinder and prevent the fly ash from clumping.

[0009] In one embodiment, the atomizing nozzle includes a nozzle section, an air supply connection section, and a pumping connection section. The air supply connection section and the pumping connection section are both located outside the grinding cylinder of the mill. The nozzle section is long and rod-shaped, with one end located on the grinding cylinder of the mill and the other end connected to the air supply connection section and the pumping connection section. The air supply connection section and the pumping connection section are on the same straight line and are perpendicular to the air supply connection section. The air supply connection section and the pumping connection section are respectively connected to the air supply pump and the grinding aid delivery pump.

[0010] By adopting the above scheme, the air supply connection and the pumping connection form a T-shape with the nozzle. When the atomizing nozzle is installed or removed, the air supply connection and the pumping connection can be used as a rotating handle, which can provide a longer lever arm for the removal of the nozzle, thereby facilitating the installation and removal of the nozzle.

[0011] In one embodiment, the grinding aid injection device further includes a mounting structure, which includes a first flange and a second flange respectively fitted onto the outer peripheral surface of the nozzle portion.

[0012] By adopting the above solution, since the atomizing nozzle is prone to shaking during use, resulting in inaccurate direction and uneven distribution of the sprayed droplets, the first flange and the second flange provide two-point limiting for the nozzle, which can effectively prevent the atomizing nozzle from shaking during use.

[0013] In one embodiment, the first flange is connected to a protective sleeve, and the protective sleeve is provided on the side of the first flange away from the second flange. The outer peripheral surface of the protective sleeve mates with the mounting through hole, and the inner wall surface mates with the outer peripheral surface of the nozzle portion.

[0014] By adopting the above solution, the part of the atomizing nozzle located inside the grinding cylinder will experience wear and tear on its surface due to the splashing of fine, hard particles after prolonged use. This reduces the service life of the atomizing nozzle, and the protective sleeve protects the atomizing nozzle.

[0015] In one embodiment, the extended end of the nozzle portion located inside the grinding cylinder of the mill is located inside the protective sleeve.

[0016] By adopting the above solution, since the nozzle of the nozzle section is exposed inside the mill grinding cylinder, the fly ash inside the mill grinding cylinder is prone to accumulate at the nozzle of the nozzle section, which can easily block the nozzle of the nozzle section. By setting the nozzle position of the nozzle section inside the protective sleeve, the nozzle of the nozzle section of the protective sleeve also plays a protective role.

[0017] In one embodiment, the outer peripheral surface of the protective sleeve is frustum-shaped.

[0018] By adopting the above solution, since the cross-sectional area of ​​the frustum is different at different positions, the protective sleeve can be adapted to installation through holes of various diameters.

[0019] In one embodiment, a first sealing ring is fitted on the outer peripheral surface of the protective sleeve, and a second sealing ring is fitted on the outer peripheral surface of the nozzle portion. The first sealing ring is located between the mounting through hole and the protective sleeve, and the second sealing ring is located between the mounting structure and the nozzle portion.

[0020] By adopting the above solution, the fly ash inside the mill grinding cylinder and the grinding aid sprayed from the atomizing nozzle are prevented from seeping out of the mill grinding cylinder.

[0021] In one embodiment, the first sealing ring is hollow and has a cross-section that is a right-angled triangle with the hypotenuse facing the mounting through hole.

[0022] By adopting the above scheme, since the outer circumferential surface of the protective sleeve and the mounting through hole have a relatively high degree of fit, the first sealing ring is easy to roll during the process of pushing the protective sleeve into the grinding cylinder of the mill. By designing the cross section of the first sealing ring as a right triangle, the first sealing ring is easier to move between the outer circumferential surface of the protective sleeve and the mounting through hole.

[0023] In one embodiment, the first flange includes a connection hole that mates with the outer peripheral surface of the nozzle portion, the inlet of the connection hole being provided with a tapered bevel, and the second sealing ring mates with the tapered bevel.

[0024] By adopting the above solution, since the second sealing ring is prone to rolling on the outer circumferential surface of the nozzle and is difficult to achieve a sealing effect, as the nozzle is inserted into the connecting hole, the second sealing ring is located in the conical bevel and is squeezed by the conical bevel and the outer circumferential surface of the nozzle. The second sealing ring is also squeezed by the second flange. Therefore, the second sealing ring achieves a good sealing effect among the first flange, the second flange and the atomizing nozzle.

[0025] In one embodiment, the protective sleeve and the first flange are integrally formed. The surface of the first flange is provided with an oil injection hole, the protective sleeve is provided with an oil injection pipe communicating with the oil injection hole, and the inner wall of the protective sleeve is provided with an oil outlet pipe communicating with the oil injection pipe.

[0026] By adopting the above solution, when disassembling and replacing the atomizing nozzle, if the surface of the atomizing nozzle is rough or there is jamming between it and the protective sleeve, making it difficult to disassemble or install the atomizing nozzle, the user can inject lubricating oil through the oil injection hole to lubricate between the protective sleeve and the atomizing nozzle. At the same time, the lubricating oil can fill the gap between the protective sleeve and the atomizing nozzle, thereby further strengthening the sealing effect.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. When the grinding aid is injected into the fly ash mill, the grinding aid delivery pump can inject the grinding aid into the atomizing nozzle in a metered manner, and the air supply pump inputs gas into the atomizing nozzle, thereby spraying the grinding aid out from the atomizing nozzle. The atomizing nozzle converts the grinding aid into a mist, so that it can fully contact the fly ash in the mill grinding cylinder and prevent the fly ash from clumping.

[0029] 2. Because the atomizing nozzle is prone to shaking during use, the direction of the sprayed droplets is inaccurate and the distribution is uneven. Moreover, after long-term use, the part of the atomizing nozzle inside the mill grinding cylinder will be impacted by the splashed fine hard particles, causing wear on the surface of the atomizing nozzle and reducing its service life. The first flange and the second flange provide two-point limiting for the nozzle part, which can effectively prevent the atomizing nozzle from shaking during use. The protective sleeve installed on the first flange protects the atomizing nozzle and also prevents fly ash inside the mill grinding cylinder from accumulating at the nozzle orifice and blocking the nozzle orifice.

[0030] 3. Since both the first and second sealing rings are prone to rolling during installation, by designing the cross-section of the first sealing ring as a right-angled triangle, the first sealing ring can more easily move between the outer circumference of the protective sleeve and the mounting through hole. Through the design of the tapered bevel, the second sealing ring is located inside the tapered bevel and is squeezed by the tapered bevel and the outer circumference of the nozzle. When the second flange is installed, the second sealing ring is also squeezed by the second flange. Therefore, the second sealing ring achieves a good sealing effect between the first flange, the second flange, and the atomizing nozzle. Attached Figure Description

[0031] Figure 1 This is a cross-sectional view of a grinding aid injection device for a fly ash mill provided in the first embodiment of this application.

[0032] Figure 2 yes Figure 1 A magnified view of region A in the middle.

[0033] Figure 3 This is an exploded view of the mounting structure and atomizing nozzle of the first embodiment of this application.

[0034] Figure 4 yes Figure 3 A magnified view of region A in the middle.

[0035] Figure 5 This is a cross-sectional view of a grinding aid injection device for a fly ash mill provided in the second embodiment of this application.

[0036] Explanation of reference numerals in the attached drawings: 1. Grinding cylinder of mill; 11. Mounting through hole; 2. Injection structure; 21. Air supply pump; 22. Grinding aid delivery pump; 23. Atomizing nozzle; 231. Nozzle section; 2311. Second sealing ring; 232. Air supply connection section; 233. Pumping connection section; 3. Mounting structure; 31. First flange; 311. Protective sleeve; 3111. First sealing ring; 3112. Oil injection pipe; 3113. Oil outlet pipe; 312. Connecting hole; 3121. Conical bevel; 313. Oil injection hole; 32. Second flange. Detailed Implementation

[0037] Therefore, it is necessary to provide a grinding aid injection device for fly ash mills that can fully mix the grinding aid with fly ash particles.

[0038] Example 1

[0039] Please see Figure 1-2 , Figure 1 This is a cross-sectional view of a grinding aid injection device for a fly ash mill, provided in the first embodiment of this application.

[0040] The system includes a grinding mill cylinder 1, an injection structure 2, and an installation structure 3. The injection structure 2 includes an air supply pump 21, a grinding aid delivery pump 22, and an atomizing nozzle 23. The air supply pump 21 and the grinding aid delivery pump 22 are located outside the grinding mill cylinder 1 and are respectively connected to the atomizing nozzle 23. The air supply pump 21 injects gas into the atomizing nozzle 23, and the grinding aid delivery pump 22 injects grinding aid into the atomizing nozzle 23. The grinding aid delivery pump 22 can be a diaphragm pump or a plunger pump, etc., for quantitative pumping. The air supply pump 21 can be a centrifugal pump or a piston pump, etc., to provide stable gas pressure and to accurately control the flow rate of the grinding aid. The atomizing nozzle 23 faces the grinding mill cylinder 1 and has an installation through hole 11. The grinding aid is sprayed out in a mist form by mixing gas and grinding aid, so that the grinding aid can fully contact the fly ash.

[0041] The atomizing nozzle 23 in the injection structure 2 includes a nozzle section 231, an air supply connection section 232, and a pumping connection section 233. The nozzle section 231 is rod-shaped with one end located inside the mill grinding cylinder 1 and the other end connected to the air supply connection section 232 and the pumping connection section 233. The air supply connection section 232 and the pumping connection section 233 are perpendicular to the nozzle section 231, and their extension lengths can be customized according to actual needs. Since the atomizing nozzle 23 is tightly connected to the mill grinding cylinder 1, the atomizing nozzle 23 needs to be repeatedly twisted during actual installation or disassembly to ensure smooth installation or disassembly. The pumping connection section 233, the air supply connection section 232, and the nozzle section 231 form a T-shaped three-way structure. The pumping connection section 233 and the air supply connection section 232 can serve as handles for twisting the nozzle section 231, making the installation and disassembly of the atomizing nozzle 23 easier. The air supply connection 232 and the pumping connection 233 are respectively connected to the air supply pump 21 and the grinding aid delivery pump 22. The air supply connection 232 and the pumping connection 233 can be made of stainless steel pipes, which can effectively prevent corrosion and wear.

[0042] The length of the nozzle section 231 can be adjusted according to the size of the mill grinding cylinder 1, for example, within a range of 100mm to 500mm, to ensure that the nozzle section 231 can penetrate deep into the mill grinding cylinder 1. The outer circumferential surface of the nozzle section 231 can be set as a smooth surface or have a spiral texture to facilitate disassembly and installation. The nozzle orifice diameter of the nozzle section 231 is typically 0.5mm to 2mm, and different nozzle heads with different orifice diameters can be selected according to actual needs. The shape of the nozzle head can be designed as conical or flat to adjust the atomization effect. For example, a conical nozzle head is suitable for long-distance spraying, while a flat nozzle head is suitable for short-distance coverage of a larger area.

[0043] The atomizing nozzle 23 is installed with the grinding cylinder 1 of the mill via the mounting structure 3. The mounting structure 3 includes a first flange 31 and a second flange 32 respectively fitted onto the outer circumferential surface of the nozzle part 231. The first flange 31 and the second flange 32 can be made of cast iron or aluminum alloy, which has good strength and corrosion resistance. The first flange 31 and the second flange 32 are connected by bolts. The bolts pass through the first flange 31 and the second flange 32 and are fixed to the grinding cylinder 1 of the mill. The number and position of the bolts should be reasonably arranged according to the actual stress conditions to ensure the stability of the connection. The first flange 31 is connected to a protective sleeve 311. The outer circumferential surface of the protective sleeve 311 mates with the mounting through hole 11, and the inner wall surface mates with the outer circumferential surface of the nozzle part 231. The protective sleeve 311 can be made of wear-resistant steel or ceramic composite material to resist the impact of splashing particles. In this application, the protective sleeve 311 and the first flange 31 are an integral structure. The length of the protective sleeve 311 should be slightly greater than the part of the nozzle 231 located inside the mill grinding cylinder 1 to prevent fly ash from blocking the nozzle 231 and to ensure sufficient protection of the nozzle 231.

[0044] A first sealing ring 3111 is fitted on the outer circumferential surface of the protective sleeve 311, and a second sealing ring 2311 is fitted on the outer circumferential surface of the nozzle part 231. The first sealing ring 3111 is located between the mounting through hole 11 and the protective sleeve 311, and the second sealing ring 2311 is located between the mounting structure 3 and the nozzle part 231. This is used to prevent fly ash inside the mill grinding cylinder 1 and grinding aid sprayed from the atomizing nozzle 23 from seeping out of the mill grinding cylinder 1. Both the first sealing ring 3111 and the second sealing ring 2311 are hollow, thus maintaining good elasticity. The materials of the first sealing ring 3111 and the second sealing ring 2311 can be selected as high-temperature resistant and corrosion-resistant fluororubber or silicone rubber. Limiting grooves can be opened on the outer peripheral surfaces of the protective sleeve 311 and the nozzle part 231 to limit the first sealing ring 3111 and the second sealing ring 2311 respectively. The cross-section of the first sealing ring 3111 is a right triangle with the hypotenuse facing the mounting through hole 11. This design makes it easier for the first sealing ring 3111 to move between the outer peripheral surface of the protective sleeve 311 and the mounting through hole 11 during the pushing process, thereby improving the installation efficiency.

[0045] Please refer to the following: Figure 3-4 , Figure 3 For the exploded view of the installation structure and atomizing nozzle of the first embodiment, the first flange 31 is provided with a connecting hole 312 that mates with the outer peripheral surface of the nozzle part 231. The inlet of the connecting hole 312 is provided with a tapered bevel 3121. The second sealing ring 2311 mates with the tapered bevel 3121 at the inlet of the connecting hole 312 of the first flange 31. The second sealing ring 2311 is partially accommodated in the tapered bevel 3121. As the nozzle part 231 is inserted into the connecting hole 312, the sealing ring tends to slide into the tapered bevel 3121. The second sealing ring 2311 is squeezed by the tapered bevel 3121 and the outer peripheral surface of the nozzle part 231, thereby forming a good sealing effect between the nozzle part 231 and the tapered bevel 3121. During the installation of the second flange 32, the part of the second sealing ring 2311 that protrudes from the tapered bevel 3121 is squeezed by the second flange 32, thereby achieving a good sealing effect between the second flange 32 and the first flange 31.

[0046] In this embodiment, the surface of the first flange 31 is provided with an oil injection hole 313, and the protective sleeve 311 is provided with an oil injection pipe 3112 communicating with the oil injection hole 313. The inner wall of the protective sleeve 311 is provided with an oil outlet pipe 3113 communicating with the oil injection pipe 3112. When disassembling and replacing the atomizing nozzle 23, if the surface of the atomizing nozzle 23 is rough or jammed with the protective sleeve 311, the user can inject lubricating oil through the oil injection hole 313. The lubricating oil flows through the oil injection pipe 3112 and the oil outlet pipe 3113 to the outer peripheral surface of the nozzle part 231, thereby playing a lubricating role between the protective sleeve 311 and the atomizing nozzle 23. At the same time, the lubricating oil can fill the gap between the protective sleeve 311 and the atomizing nozzle 23, further enhancing the sealing effect.

[0047] The working principle of this embodiment is as follows: When the grinding aid is injected into the fly ash mill, the grinding aid delivery pump 22 can inject the grinding aid into the atomizing nozzle 23 in a quantitative manner, and the air supply pump 21 inputs gas into the atomizing nozzle 23, thereby spraying the grinding aid out from the atomizing nozzle 23. The atomizing nozzle 23 converts the grinding aid into a mist, so that it can fully contact the fly ash in the mill grinding cylinder 1 and prevent the fly ash from clumping.

[0048] Example 2

[0049] Please see Figure 5 , Figure 5 This is a cross-sectional view of a grinding aid injection device for a fly ash mill according to the second embodiment of this application. The structure of this embodiment is basically the same as that of the above embodiment, except that the outer peripheral surface of the protective sleeve 311 is designed as a frustum. The frustum design allows the protective sleeve 311 to adapt to various diameter mounting holes 11, which is especially suitable for situations where the mounting holes 11 have tolerances or dimensional variations. Since the cross-sectional area of ​​the frustum is different at different positions, the protective sleeve 311 can be adjusted to adapt to different diameter mounting holes 11 during installation by adjusting its insertion depth, thereby improving the flexibility and compatibility of installation. In addition, the frustum design can also reduce the frictional resistance between the protective sleeve 311 and the mounting hole 11 during installation, facilitating quick installation and disassembly.

[0050] The working principle of this embodiment is as follows: Since the size of the mounting through-hole 11 varies among different models of fly ash mills, and jamming easily occurs between the protective sleeve 311 and the mounting through-hole 11, designing the outer circumferential surface of the protective sleeve 311 as a frustum shape not only improves the adaptability of the device to mounting through-holes 11 of different diameters but also reduces the operational difficulty during installation and disassembly. This design is particularly suitable for scenarios requiring frequent replacement or maintenance, effectively enhancing the practicality of the device.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A grinding aid injection device for a fly ash mill, characterized in that, include: A mill grinding cylinder (1) contains fly ash. The mill grinding cylinder (1) includes a mounting through hole (11), and The injection structure (2) includes an air supply pump (21), a grinding aid delivery pump (22), and an atomizing nozzle (23). The air supply pump (21) and the grinding aid delivery pump (22) are located outside the mill grinding cylinder (1) and are respectively connected to the atomizing nozzle (23). The air supply pump (21) injects gas into the atomizing nozzle (23), and the grinding aid delivery pump (22) injects grinding aid into the atomizing nozzle (23). The atomizing nozzle (23) faces the mill grinding cylinder (1) and passes through the mounting through hole (11). The atomizing nozzle (23) includes a nozzle section (231), an air supply connection section (232), and a pumping connection section (233). The air supply connection section (232) and the pumping connection section (233) are both located outside the mill grinding cylinder (1). The nozzle section (231) is rod-shaped with one end located in the mill grinding cylinder (1) and the other end connected to the air supply connection section (232) and the pumping connection section (233). The air supply connection section (232) and the pumping connection section (233) are on the same straight line and are perpendicular to the air supply connection section (232). The air supply connection section (232) and the pumping connection section (233) are connected to the air supply pump (21) and the grinding aid delivery pump (22), respectively. The grinding aid injection device further includes an installation structure (3), which includes a first flange (31) and a second flange (32) respectively fitted onto the outer circumferential surface of the nozzle part (231); The first flange (31) is provided with a protective sleeve (311) on the side away from the second flange (32). The outer peripheral surface of the protective sleeve (311) is engaged with the mounting through hole (11) and the inner wall surface is engaged with the outer peripheral surface of the nozzle part (231).

2. The grinding aid injection device for a fly ash mill according to claim 1, characterized in that: The extended end of the nozzle portion (231) located inside the grinding cylinder (1) of the mill is located inside the protective sleeve (311).

3. The grinding aid injection device for a fly ash mill according to claim 1, characterized in that: The outer circumferential surface of the protective sleeve (311) is frustum-shaped.

4. The grinding aid injection device for a fly ash mill according to claim 1, characterized in that: The outer circumferential surface of the protective sleeve (311) is fitted with a first sealing ring (3111), and the outer circumferential surface of the nozzle part (231) is fitted with a second sealing ring (2311). The first sealing ring (3111) is located between the mounting through hole (11) and the protective sleeve (311), and the second sealing ring (2311) is located between the mounting structure (3) and the nozzle part (231).

5. The grinding aid injection device for a fly ash mill according to claim 4, characterized in that: The first sealing ring (3111) is hollow and its cross-section is a right triangle with the hypotenuse facing the mounting through hole (11).

6. The grinding aid injection device for a fly ash mill according to claim 4, characterized in that: The first flange (31) includes a connecting hole (312) that mates with the outer peripheral surface of the nozzle portion (231). The inlet of the connecting hole (312) is provided with a tapered bevel (3121), and the second sealing ring (2311) mates with the tapered bevel (3121).

7. The grinding aid injection device for a fly ash mill according to claim 1, characterized in that: The protective sleeve (311) and the first flange (31) are integral structures. The surface of the first flange (31) is provided with an oil injection hole (313). The protective sleeve (311) is provided with an oil injection pipe (3112) communicating with the oil injection hole (313). The inner wall of the protective sleeve (311) is provided with an oil outlet pipe (3113) communicating with the oil injection pipe (3112).

Images