Connecting device for wear-resistant lining plate and cylinder of coal mill and coal mill

Abstract

The present application proposes a connection device for a wear-resistant lining and a cylinder of a coal mill and a coal mill, wherein the connection device includes a first connection hole arranged on the cylinder; a second connection hole arranged on the wear-resistant lining, the second connection hole being relatively connected to the first connection hole; a connecting bolt passing through the second connection hole and the first connection hole in sequence; a transition ring fixedly arranged on the outside of the cylinder, the connecting bolt passing through the inner cavity of the transition ring; a rubber sealing ring sleeved between the transition ring and the connecting bolt; a gasket crimped on the outer end of the rubber sealing ring, the connecting bolt passing through the gasket; a nut crimped on the outer end of the gasket, the nut cooperating with the connecting bolt, and the connection device can improve the sealing effect and effectively prevent coal slurry leakage.

Description

Technical Field

[0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a connecting device for a wear-resistant liner and a cylinder of a coal mill and a coal mill. Background Art

[0002] Coal mill is a mechanical device that breaks coal blocks and grinds them into coal powder. It is a key core equipment in the complete set of equipment for clean and efficient utilization of coal. The coal blocks are inside the coal mill cylinder, and the cylinder with grinding media (steel balls or grinding rods) is driven by gears to rotate. The coal blocks are hit by the grinding media and ground between the grinding media and between the grinding media and the cylinder lining to produce coal powder of qualified particle size.

[0003] The wear-resistant lining plate in the cylinder of the wet coal mill is made of cast wear-resistant alloy, while the cylinder steel plate is a rolled riveted and welded structural part. There are inevitably different degrees of gaps between the cylinder and the wear-resistant lining plate. In order to facilitate installation, the bolt holes on the wear-resistant lining plate and the bolt holes on the cylinder are connected by through holes, so that there are also different degrees of gaps between the bolts and the bolt holes. The slurry in the cylinder enters these gaps through the gaps between the wear-resistant lining plate and the bolts, forming "liquid cavities" of different sizes. During the operation of the coal mill, the grinding body (steel ball or steel rod) exerts a certain impact force on the wear-resistant lining plate (the impact force of the steel rod is greater than that of the steel ball). Under the action of this impact force, the wear-resistant lining plate produces instantaneous elastic deformation, causing the volume of the "liquid cavity" to suddenly shrink. Due to the non-compressible characteristics of the liquid, the slurry in the "liquid cavity" is squeezed to the surroundings under pressure. The outer seal of the cylinder is suddenly compressed and contracted, and a gap is formed with the surface of the cylinder to form slurry leakage.

[0004] It can be seen that the coal mill generally has leakage at the bolt holes of the cylinder during operation, which pollutes the workshop production environment. Therefore, it is necessary to design a connection device between the wear-resistant liner and the cylinder of the coal mill to improve the sealing effect. Summary of the invention

[0005] In view of some or all of the above technical problems existing in the prior art, the present invention proposes a connection device for a wear-resistant liner and a cylinder for a coal mill and a coal mill. The connection device for a wear-resistant liner and a cylinder for a coal mill can improve the sealing effect and effectively prevent coal slurry leakage.

[0006] According to one aspect of the present invention, a connection device between a wear-resistant liner and a cylinder of a coal mill is provided, comprising:

[0007] A first connecting hole is provided on the cylinder body,

[0008] A second connecting hole is provided on the wear-resistant lining, and the second connecting hole is relatively connected with the first connecting hole.

[0009] A connecting bolt passes through the second connecting hole and the first connecting hole in sequence,

[0010] A transition ring is fixedly arranged on the outside of the cylinder, and the connecting bolt passes through the inner cavity of the transition ring.

[0011] A rubber sealing ring is sleeved between the transition ring and the connecting bolt,

[0012] A gasket is crimped onto the outer end of the rubber sealing ring, and the connecting bolt passes through the gasket.

[0013] A nut is crimped onto the outer end of the gasket, and the nut cooperates with the connecting bolt.

[0014] In one embodiment, the rubber sealing ring comprises:

[0015] cylindrical body,

[0016] A gasket is arranged at the outer end of the main body, the gasket extends along the radial direction of the connecting bolt and is located between the outer end surface of the transition ring and the inner end surface of the gasket.

[0017] In one embodiment, a groove is provided on the inner wall of the rubber sealing ring, and a protrusion is provided on the inner end surface of the gasket, and the protrusion is used to be inserted into the groove in a matching manner.

[0018] In one embodiment, the main body is threadably connected to the transition ring.

[0019] In one embodiment, a vibration-damping pad is provided between the outer end surface of the wear-resistant lining plate and the inner end surface of the cylinder.

[0020] In one embodiment, the vibration damping pad is made of rubber material, and the vibration damping pad is bonded to a wear-resistant lining plate or a cylinder.

[0021] In one embodiment, an expansion sleeve is sleeved on the outer wall of the connecting bolt, the inner end face of the expansion sleeve abuts against the bolt head of the connecting bolt, and the outer end face protrudes from the outer side face of the cylinder and abuts against the rubber sealing ring, and axially extending gaps are arranged at intervals at the inner end of the expansion sleeve.

[0022] In one embodiment, a circular hole is provided at the end of the slit.

[0023] In one embodiment, the slot is configured as a cone with an inner end wider than an outer end.

[0024] According to another aspect of the present invention, there is provided a coal pulverizer, comprising:

[0025] Cylinder,

[0026] A wear-resistant lining plate is arranged on the inner side of the cylinder,

[0027] The above-mentioned connecting device between the wear-resistant liner and the cylinder of the coal mill.

[0028] Compared with the prior art, the present invention has the advantages that: by providing a transition ring, the leakage problem of the slurry at this location along the radial direction of the connecting bolt can be effectively avoided, thereby improving the sealing effect. At the same time, due to the provision of a rubber sealing ring and the abutment of the gasket, a good sealing effect can be achieved, thereby avoiding or reducing the occurrence of coal slurry leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0030] Figure 1 The connecting device between the wear-resistant lining plate and the cylinder of the coal mill according to the present invention is shown;

[0031] Figure 2a 2a shows a main cross-sectional view of a gasket according to the present invention, and 2b shows a top view of a gasket according to the present invention;

[0032] Figure 3a 3a shows a main cross-sectional view of a rubber sealing ring according to the present invention, and 3b shows a top view of a rubber sealing ring according to the present invention;

[0033] Figure 4a 4b shows a main cross-sectional view of a transition ring according to the present invention, and 4b shows a top view of a transition ring according to the present invention;

[0034] Figure 5a 5a shows a main sectional view of the expansion sleeve according to the present invention, 5b shows a top view of the expansion sleeve according to the present invention, and 5c shows a left side view of the expansion sleeve according to the present invention.

[0035] In the drawings, the same reference numerals are used for the same components, but the drawings are not drawn to scale. DETAILED DESCRIPTION

[0036] In order to make the technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all the embodiments. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0037] The embodiment of the present invention provides a connection device between a wear-resistant lining plate and a cylinder for a coal mill. Figure 1As shown, the connecting device for the wear-resistant lining and the cylinder of the coal mill includes a first connecting hole 1, a second connecting hole 2, a connecting bolt 3, a transition ring 4, a rubber sealing ring 5, a gasket 6 and a nut 7. Among them, the first connecting hole 1 is set on the cylinder 8, and is used for the connecting bolt 3 to pass through and play the role of a connecting hole. The second connecting hole 2 is set on the wear-resistant lining 9. The second connecting hole 2 is relatively connected to the first connecting hole 1, and is used for the connecting bolt 3 to pass through and play the role of a connecting hole. The connecting bolt 3 passes through the second connecting hole 2 and the first connecting hole 1 in sequence, and is used to fix the wear-resistant lining 9 to the cylinder 8. The transition ring 4 is fixedly set on the outer wall of the cylinder 8. The transition ring 4 itself is cylindrical, and is used for the connecting bolt 3 to pass through. The rubber sealing ring 5 is sleeved between the transition ring 4 and the connecting bolt 3, and mainly plays a sealing role. The gasket 6 is crimped on the outer end of the rubber sealing ring 5, and the connecting bolt 3 passes through the gasket 6. The gasket 6 mainly plays a role of abutting the rubber sealing ring 5 to ensure the sealing effect of the rubber sealing ring 5. The nut 7 is crimped onto the outer end of the gasket 6 and threadably matched with the connecting bolt 3 .

[0038] In the application, the wear-resistant lining plate 9 is fixed to the cylinder 8 by the cooperation of the connecting bolts 3 and the nuts 7, which plays a role of fixed connection. Since the transition ring 4 is provided, the leakage of slurry can be effectively prevented from leaking along the radial direction of the connecting bolts 3 at this location, and the sealing effect at this location is improved. At the same time, the transition ring 4 and the rubber sealing ring 5 jointly play the role of limiting and guiding the connecting bolts 3, which helps to avoid the problems of skewness and uneven force of the connecting bolts 3. In addition, by providing the rubber sealing ring 5, a good sealing effect is achieved to prevent the leakage of coal slurry at this location. In addition, the gasket 6 will apply the abutment force along the axial direction of the connecting bolt 3 to the rubber sealing ring 5, which can further ensure the sealing effect.

[0039] In one embodiment, Figure 3a and 3b As shown, the rubber sealing ring 5 includes a main body 10 and a gasket 11. The main body 10 itself is cylindrical and is located between the transition ring 4 and the connecting bolt 3, mainly to prevent the liquid from leaking and flowing through the gap between the transition ring 4 and the connecting bolt 3. The gasket 11 is arranged at the outer end of the main body 10. Specifically, the gasket 11 is annular and extends along the radial direction of the connecting bolt 3, and is located between the outer end face of the transition ring 4 and the inner end face of the gasket 6. Therefore, the gasket 11 plays the role of sealing the gap between the transition ring 4 and the gasket 6 to prevent liquid from leaking therefrom.

[0040] Preferably, a groove 12 is provided on the inner wall of the rubber sealing ring 5. A protrusion 13 is provided on the inner end surface of the gasket 6. Figure 2a and 2bAs shown. After the assembly connection, the protrusion 13 is used to be inserted into the groove 12 in a matching manner. On the one hand, the above arrangement can ensure the installation position of the gasket 6 and the rubber sealing ring 5, and ensure quick positioning and installation; on the other hand, the above arrangement forms a concave-convex matching structure with the rubber sealing ring 5 and the gasket 6, which blocks the leakage of slurry along the radial direction of the connecting bolt 3, reduces or avoids the risk of leakage of slurry at the gasket 6, and improves the sealing effect.

[0041] Further preferably, the main body 10 is threadedly connected to the transition ring 4. Therefore, during the installation process, the main body 10 of the rubber sealing ring 5 can be gradually screwed into the transition ring 4. The above arrangement not only increases the installation accuracy, provides positioning for the installation of the rubber sealing ring 5, and ensures the convenience of installation, but also forms a thread seal at this location through the cooperation between the main body 10 and the transition ring 4, thereby improving the sealing effect. In addition, if Figure 4a and 4b As shown, the transition ring 4 itself is cylindrical and can be set on the cylinder 8 by full welding. The connection is simple and easy to implement, and effectively ensures the sealing effect of the transition ring 4.

[0042] In one embodiment, a vibration-damping pad 14 is provided between the outer end surface of the wear-resistant lining plate 9 and the inner end surface of the cylinder 8. Preferably, the vibration-damping pad 14 can be made of a material with excellent elasticity, such as rubber. During the installation process, the vibration-damping pad 14 can be first bonded to the wear-resistant lining plate 9 or the cylinder 8 for ease of installation. The vibration-damping pad 14 made of rubber can help reduce noise and vibration. At the same time, the vibration-damping pad 14 made of rubber material has good acid and alkali corrosion resistance and a long service life.

[0043] In one embodiment, an expansion sleeve 15 is sleeved on the outer wall of the connecting bolt 3. The expansion sleeve itself is cylindrical, and its inner end face abuts against the bolt head of the connecting bolt 3, while the outer end face protrudes from the outer side of the cylinder 8 and abuts against the rubber sealing ring 5. Figure 5a , 5b As shown in FIG. 5c, an axially extending gap 16 is provided at intervals at the inner end of the expansion sleeve 15. After being installed in place, the inner and outer ends of the expansion sleeve 15 are squeezed. Since the inner end of the expansion sleeve 15 has the gap 16, it is easy to expand in the circumferential direction of the expansion sleeve 15, thereby occupying the space between the connecting bolt 3 and the cylinder 8, and enhancing the bonding force of the connecting bolt 3, the cylinder 8 and the wear-resistant lining 9. The above arrangement can improve the shear resistance of the connecting bolt 3. In addition, the expansion sleeve 15 also transmits the axial force of the connecting bolt 3 to the rubber sealing ring 5, actuating the rubber sealing ring 5 to deform, and further improving the sealing effect.

[0044] Preferably, a plurality of gaps 16 are provided in the circumferential direction of the expansion sleeve 15, for example, 3-10 gaps 16. In the present application, an example of providing 6 gaps 16 is given. Further preferably, the plurality of gaps 16 can be evenly distributed in the circumferential direction to ensure the uniformity of the expansion deformation of the expansion sleeve 15. In addition, the gap 16 is constructed as a cone with a width at the inner end relative to the outer end. That is to say, the gap 16 is relatively wide at the open end, and gradually narrows as the gap expands toward the outer end. This arrangement can ensure that the gap 16 has a better expansion effect at the inner end. In addition, a circular hole 17 is provided at the end of the gap 16. During the process of the expansion sleeve 15 being expanded under force and the gap 16 being deformed, the circular hole 17 can effectively avoid stress concentration and avoid tearing at the outer end of the gap 16 and destroying the expansion sleeve 15. The present application does not limit the specific material of the expansion sleeve 15, as long as it is a material with good elasticity and a certain rigidity, it can be used, for example, ordinary steel.

[0045] In the present application, the connecting bolt 3 may be a ball mill bolt. In use, it passes through the second connecting hole 2 and the first connecting hole 1 in sequence to fix the wear-resistant lining plate 9 to the cylinder 8. It can be understood that the second connecting hole 2 is a countersunk hole matching the bolt head of the connecting bolt 3. In addition, the connecting bolt 3 adopts a double nut 7 structure, and the upper and lower double nuts 7 can play a role in locking and preventing loosening.

[0046] The present application also relates to a coal mill, which comprises a cylinder 8, a wear-resistant lining plate 9 arranged inside the cylinder 8, and the above-mentioned connecting device between the wear-resistant lining plate and the cylinder for the coal mill.

[0047] It should be noted that the orientations used in this application for “inner end” and “outer end” are all based on the structural orientations of the cylinder 8 and the wear-resistant lining 9 , that is, the wear-resistant lining 9 is located at the inner end of the cylinder 8 .

[0048] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and / or modifications that fall within the scope of the present invention, and changes and / or modifications made according to the embodiments of the present invention should be included within the scope of protection of the present invention.

Claims

1. A connection device for a wear-resistant lining plate and a cylinder of a coal mill, characterized in that: include: A first connecting hole is provided on the cylinder body, A second connecting hole is provided on the wear-resistant lining, and the second connecting hole is relatively connected with the first connecting hole. A connecting bolt passes through the second connecting hole and the first connecting hole in sequence, A transition ring is fixedly arranged on the outside of the cylinder, and the connecting bolt passes through the inner cavity of the transition ring. A rubber sealing ring is sleeved between the transition ring and the connecting bolt, A gasket is crimped onto the outer end of the rubber sealing ring, and the connecting bolt passes through the gasket. A nut is crimped onto the outer end of the gasket, and the nut cooperates with the connecting bolt. Wherein, the rubber sealing ring includes a cylindrical main body and a gasket arranged at the outer end of the main body, the gasket extends along the radial direction of the connecting bolt and is located between the outer end face of the transition ring and the inner end face of the gasket, a groove is arranged on the inner wall of the rubber sealing ring, and a protrusion is protrudingly arranged on the inner end face of the gasket, and the protrusion is used to be inserted into the groove in a matching manner, the main body is threadedly connected with the transition ring, an expansion sleeve is sleeved on the outer wall of the connecting bolt, the inner end face of the expansion sleeve abuts against the bolt head of the connecting bolt, and the outer end face protrudes from the outer side face of the cylinder and abuts against the rubber sealing ring, and an axially extending gap is arranged at intervals at the inner end of the expansion sleeve.

2. The connecting device for the wear-resistant lining plate and the cylinder of a coal mill according to claim 1, characterized in that: A vibration-damping pad is arranged between the outer end surface of the wear-resistant lining plate and the inner end surface of the cylinder.

3. The connecting device for the wear-resistant lining plate and the cylinder of the coal mill according to claim 2, characterized in that: The vibration damping pad is made of rubber material and is bonded to the wear-resistant lining plate or the cylinder.

4. The connecting device for the wear-resistant lining plate and the cylinder of a coal mill according to claim 1, characterized in that: A circular hole is arranged at the end of the slit.

5. The connecting device for the wear-resistant lining plate and the cylinder of a coal mill according to claim 1, characterized in that: The slot is configured as a cone whose inner end is wider than the outer end.

6. A coal mill, characterized in that: include: Cylinder, A wear-resistant lining plate is arranged on the inner side of the cylinder, A device for connecting a wear-resistant liner and a cylinder for a coal mill according to any one of claims 1 to 5.

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