Novel rod mill cylinder bolt sealing device

Abstract

The utility model discloses a novel rod mill barrel bolt sealing device, which relates to the technical field of rod mill barrel flat head bolt sealing and particularly comprises a lining plate, a barrel, a sealing box, nickel wire graphite packing, a gland, a fastening screw, a retaining washer, a nut and a lining plate fixing flat head bolt. The lining plate is laid on the inner wall of the barrel, the sealing box is fully welded to the outer wall of the barrel, a threaded blind hole is formed in the end face, away from the barrel, of the sealing box, the nickel wire graphite packing is filled in the sealing box, the gland is provided with a threaded through hole, the gland is closed to the sealing box, and the sealing box is provided with a threaded through hole. The fastening screw is connected with the sealing groove and the gland, and the nickel wire graphite packing is tightly pressed at the bottom of the sealing box. The lining plate fixing flat head bolt comprises a flat head bolt body, a retaining washer and a nut, the outer end of the flat head bolt body sequentially penetrates through the lining plate, the cylinder body, the sealing box, the nickel wire graphite packing, the gland, the fastening screw and the retaining washer, and the outer end of the flat head bolt body is connected with the nut.

Description

Technical Field

[0001] The utility model relates to the technical field of rod mill barrel flat head bolt sealing, in particular to a novel rod mill barrel bolt sealing device. Background Art

[0002] Rod mill is a kind of mill with steel rods as grinding media in the cylinder. Rod mill is generally of wet overflow type and can be used as primary open circuit grinding. It is widely used in artificial stone sand, ore dressing plant, chemical plant and power department. The mill is mainly composed of motor, main reducer, transmission part, cylinder part, main bearing, slow transmission part, feeding part, discharging part, annular seal, thin oil lubrication station, large and small gears injection lubrication, foundation part, etc. The main reducer is parallel shaft and hard tooth surface. Rod mill is an asynchronous motor connected with small gear through reducer, directly driving the surrounding large gear to reduce speed and drive the rotating part to rotate. Appropriate grinding media - steel rods are installed inside the cylinder. Under the action of centrifugal force and friction, the grinding media continuously enters the cylinder from the feeding part, is crushed by the moving grinding media, and the product is discharged out of the machine through overflow and continuous feeding force for the next process.

[0003] The rod mill barrel liner fixing flat head bolts and sealing gaskets have been leaking to varying degrees since the initial start-up, which has always been a common problem in the coal chemical industry; the existing rod mill barrel liner fixing structure is as follows Figure 1 As shown, the reason is:

[0004] 1. When the rod mill is in operation, the liner rotates with the cylinder, causing relative displacement between the liner and the cylinder, causing the flat head bolts to withstand periodic alternating shear forces and break due to fatigue.

[0005] 2. The inner hole of the liner is a cast hole, not a machined surface. When it contacts with the flat head bolt, it is not a surface contact, but a point contact or a line contact. If the flat head bolt hole is slightly worn, the flat head bolt will loosen, causing the cylinder to leak slurry or the flat head bolt to break.

[0006] 3. The flat head bolt hole of the cylinder is worn into an elliptical shape, and the maximum single-side length of the hole diameter is about 40mm. The flat head bolt and the cylinder cannot be guaranteed to be completely vertical, and the force is uneven.

[0007] 4. The material of the sealing rubber ring is hard and easy to harden and crack, causing the flat head bolts to loosen, resulting in leakage or breakage of the flat head bolts.

[0008] 5. A 5mm thick rubber pad is added between the liner and the cylinder to reduce noise, but this rubber pad makes the liner and the cylinder elastic, which can easily loosen the flat head bolts, causing leakage or breakage.

[0009] 6. Once the bolt breaks, the side close to the liner will fall into the cylinder; the bolts close to the outside will fly out, posing a safety hazard; in addition, slurry leakage will immediately occur at the break, forcing production to be stopped.

[0010] 7. The nuts used to fasten the screws often become loose and require maintenance personnel to tighten them regularly, otherwise leakage will occur. Utility Model Content

[0011] The utility model aims to provide a rod mill cylinder leakage sealing structure. Its unique design is to penetrate the outer end of the flat head bolt and fix it on the outside of the cylinder. The flat head bolt located on the outside of the cylinder is longer than the flat head bolt located on the inside of the cylinder. This is equivalent to the resistance arm given to the flat head bolt by the cylinder, sealing box, rubber sealing ring, gland and nut being much larger than the power arm given to the inner end of the nut by the liner. The shear force applied by the liner will be significantly increased, and the possibility of wear of the flat head bolt hole on the cylinder is significantly reduced.

[0012] In order to solve the technical problem of leakage in the cylinder sealing structure of the rod mill in the prior art, the present application provides a novel rod mill cylinder bolt sealing device, which comprises a liner, a cylinder, a sealing box, a nickel-graphite packing, a pressure cover, a fastening screw, a back-stop washer and a liner fixing flat head bolt; the liner is laid on the inner wall of the cylinder, the sealing box is fully welded to the outer wall of the cylinder, a threaded blind hole is provided on the end face of the sealing box away from the cylinder, the nickel-graphite packing is filled in the sealing box, the pressure cover is provided with a threaded through hole, the pressure cover is engaged with the sealing box, the fastening screw connects the sealing groove and the pressure cover, and presses the nickel-graphite packing to the bottom of the sealing box; the liner fixing flat head bolt comprises a flat head bolt, a back-stop washer and a nut, the outer end of the flat head bolt sequentially passes through the liner, the cylinder, the sealing box, the nickel-graphite packing, the pressure cover, the fastening screw, the back-stop washer, and the nut is connected at the outer end.

[0013] Furthermore, the utility model provides a rod mill cylinder leakage sealing structure, wherein a flat head countersunk groove is provided in the plate surface of the liner away from the cylinder, and the inner end of the flat head nut is buried in the flat head countersunk groove.

[0014] Furthermore, the utility model provides a novel rod mill barrel bolt sealing device, which, in order to reduce the noise level of the manufacturing environment as much as possible, also includes a rubber pad, and the rubber pad is arranged between the barrel and the liner.

[0015] Furthermore, the utility model provides a novel rod mill barrel bolt sealing device, wherein a retaining washer is sleeved on the flat head bolt between the nut and the gland.

[0016] Furthermore, the utility model provides a new rod mill barrel bolt sealing device. Once the bolt breaks, in order to prevent the safety hazard of the bolt near the outside from flying out, and the slurry leakage will immediately occur at the broken part, so that the production is forced to stop. A blind hole is opened on the outside of the sealing box, and a through hole is opened on the gland to install the fastening screw. Therefore, even if the bolt breaks, the sealing box and the gland can be connected and fastened into a whole. And it can also prevent the gland from rotating during the tightening of the flat head bolt. The fastening screw passes through the gland and is inserted into the sealing box.

[0017] Compared with the prior art, the utility model has the following beneficial effects: the utility model is provided with a sealing box, a stop washer, a nickel wire graphite packing, a pressure cover, a fastening screw and other structures, which can improve the fixing reliability of the flat head bolt and enhance the sealing performance; the nickel wire graphite packing has a long service life, and the nickel wire graphite packing used as a sealing spring gasket is not easy to harden and spall, so it will not cause the flat head bolt to loosen, thereby effectively avoiding leakage of slurry or breakage of the flat head bolt, thereby reducing the number of equipment starts and stops, improving on-site environmental hygiene, and ensuring the stability of coal slurry concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the sealing structure of the rod mill cylinder leakage in the prior art;

[0019] Figure 2 This is a structural schematic diagram of a first embodiment of a novel rod mill barrel bolt sealing device of the utility model;

[0020] Figure 3 for Figure 2 Partial magnification;

[0021] In the figure: 1. lining plate; 2. cylinder; 3. sealing box; 4. rubber sealing ring; 5. gland; 6. elastic gasket; 7. rubber pad; 8. sealing groove; 9. clamping ring; 10. flat head bolt; 11. nut; 12. flat head countersunk groove; 13. anti-slip pattern; 14. anti-rotation pin. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do 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 cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] like Figure 2 and Figure 3 As shown, this embodiment provides a new type of leakage sealing structure of a rod mill cylinder 2, which includes a liner 1, a cylinder 2, a sealing box 3, a nickel-wire graphite packing 4, a pressure cover 5, a liner fixing flat head bolt 10, a stop washer 6, and a fastening screw 12; the liner 1 is laid on the inner wall of the cylinder 2, and a rubber pad 7 is arranged between the cylinder 2 and the liner 1 to reduce the environmental noise level, the sealing box 3 is fully welded to the outer wall of the cylinder 2, and a threaded blind hole is provided in the end face of the sealing box 3 away from the cylinder 2, the nickel-wire graphite packing 4 is filled in the sealing groove 8, and the pressure cover 5 is installed in the sealing groove 8. The cover 5 is provided with a threaded through hole 9, the gland 5 covers the sealing box 3, the fastening screw 13 penetrates the gland through hole 9 and the sealing box blind hole 8, and presses the nickel wire graphite packing 4 to the bottom of the sealing box 8; the liner fixing flat head bolt comprises a flat head bolt 10 and a nut 11, the outer end of the flat head bolt 10 sequentially penetrates the liner 1, the cylinder 2, the sealing box 3, the nickel wire graphite packing 4, the gland 5, the fastening screw 13, and is connected to the nut 11 at the outer end; the stop washer 6 is sleeved on the flat head bolt 10 between the nut 11 and the gland 5;

[0026] As a preferred technical solution of this embodiment, Figure 2 As shown, a flat head countersunk groove 12 is provided in the plate surface of the lining plate 1 away from the cylinder 2, and the inner end of the flat head nut 11 is buried in the flat head countersunk groove 12;

[0027] If the flat head bolt 10 breaks, the gland 5, the broken bolts and nuts near the outside will fly out, which is a potential safety hazard, and leakage will occur immediately. To this end, the gland 5 is provided with a threaded through hole 9, the gland 5 is covered with the sealing box 3, the fastening screw 13 is inserted into the gland through hole 9 and the sealing box blind hole 8, and the nickel wire graphite packing 4 is pressed against the bottom of the sealing box 8.

[0028] Assembly process and principle: Rubber pad 7 is placed between liner 1 and cylinder 2. Flat head bolt 10 passes through liner 1, rubber pad 7 and cylinder 2 from the inner cavity of cylinder 2 to the outside of cylinder 2. Sealing box 3 is sleeved on the outer end of flat head bolt 10 until sealing box 3 contacts the outer wall of cylinder 2. Since the outer wall of cylinder 2 is in arc shape, full welding is adopted in the gap between sealing box 3 and the outer wall of cylinder 2 to realize reliable connection between the two. Nickel wire graphite packing is used as sealing ring 4 and sleeved on flat head bolt 10 and filled in pre-sealing groove 8. Pressure cover 5 is closed on the outer end of sealing box 3 until fastening screws are installed in through hole 9 on pressure cover 5 and blind hole on sealing box 3, pressing against nickel wire graphite packing sealing ring 4. Finally, the flat head bolt 10 at the outer end of pressure cover 5 is sleeved in sequence. A stop washer 6 and a nut 11 are provided, and the nut 11 can be tightened. The above structure can ensure that the nickel-graphite packing seal ring 4 not only withstands the axial extrusion force for sealing effect, but also eliminates the torsional force of the nickel-graphite packing seal ring 4, thereby extending the service life of the nickel-graphite packing seal ring 4; on the other hand, most of the main body of the flat head bolt 10 is fixed to the cylinder 2 by the sealing box 3, the nickel-graphite packing seal ring 4, the pressure cover 5, the stop washer 6 and the nut 11, and this part constitutes the resistance arm of the nut 11, while the flat head bolt 10 located in the inner cavity of the cylinder 2 is smaller in size, and the power arm formed by the liner 1 to it is relatively small. At this point, the shearing ability that the flat head bolt 10 can withstand is significantly enhanced, and the leakage prevention effect is also significantly improved.

[0029] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

[0030] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified and replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A new rod mill barrel bolt sealing device, characterized by: It includes a lining plate, a cylinder, a sealing box, a nickel-graphite packing, a pressure cover, a fastening screw, a back-stop washer, a nut and a lining plate fixing flat head bolt; the lining plate is laid on the inner wall of the cylinder, the sealing box is fully welded to the outer wall of the cylinder, a threaded blind hole is provided on the end face of the sealing box away from the cylinder, the nickel-graphite packing is filled in the sealing box, the pressure cover is provided with a threaded through hole, the pressure cover is engaged with the sealing box, the fastening screw connects the sealing groove and the pressure cover, and presses the nickel-graphite packing to the bottom of the sealing box; the lining plate fixing flat head bolt includes a flat head bolt, a back-stop washer and a nut, the outer end of the flat head bolt sequentially passes through the lining plate, the cylinder, the sealing box, the nickel-graphite packing, the pressure cover, the fastening screw, the back-stop washer, and the nut is connected at the outer end.

2. A novel rod mill barrel bolt sealing device according to claim 1, characterized in that: It also includes a nickel wire graphite packing as a sealing gasket, and the nickel wire graphite packing is arranged between the sealing box and the pressure cover.

3. A novel rod mill barrel bolt sealing device according to claim 1, characterized in that: The sealing box is provided with a threaded blind hole at the end surface away from the cylinder, the gland is provided with a threaded through hole and is closely attached to the end surface of the sealing box, and the fastening screw is installed.

4. A novel rod mill barrel bolt sealing device according to claim 1, characterized in that: A retaining washer is sleeved on the flat head bolt between the nut and the gland.

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