Pressure-bearing sealing structure for connecting steel ball mill lining plate and cylinder body by adopting bolt piece
By increasing the included angle of the transition section between the liner bolt and the liner, adding an aluminum bushing, extending the cylindrical section of the liner bolt, and thickening the pressure ring, the problems of liner breakage and dust leakage were solved, and the operational safety and sealing effect of the steel ball mill were improved.
Patent Information
- Application Number
- CN202423178461.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-12-23
AI Technical Summary
In existing steel ball mill equipment, the liner mounting holes are prone to breakage and serious dust leakage, which affects equipment operation safety and causes environmental pollution.
By increasing the included angle of the transition section between the liner bolt and the liner to 90° to 120°, and adding an aluminum bushing between the outer wall of the tapered transition section of the liner bolt and the tapered transition hole section of the liner, the cylindrical section of the liner bolt is extended and the pressure ring is thickened, thereby improving the sealing condition between the gasket and the liner bolt.
It effectively prevents the liner from cracking, improves sealing performance, reduces dust leakage, extends the service life of the liner, and improves the operating environment and safety.
Smart Images
Figure CN223683645U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to material grinding and powder making technical field, more specifically relates to a kind of pressure containment sealing structure of bolt piece connection steel ball mill liner and cylinder. BACKGROUND
[0002] Steel ball mill is a kind of widely used grinding and powder making device, in order to avoid the damage of steel ball to cylinder, a layer of high chromium cast iron or wear-resistant cast steel material lining is installed in the cylinder, see Figure 1 Lining is fixed on the cylinder by lining bolt, see Figure 2 Lining mounting hole form on the lining is seen Figure 3 , and lining mounting hole includes three sections, in sequence, waist hole section, taper transition hole section and cylindrical hole section.Lining bolt structure is seen Figure 4 , and it includes waist column section, taper transition section, cylindrical section and thread section in sequence.In connection, the taper transition section of lining bolt and the taper transition hole section of lining mounting hole are closely combined, the bolt is axially positioned and prevented from rotating, and the angle of transition section is 60°.In order to prevent dust in the cylinder from leaking from the mounting hole on the cylinder, sealing gasket of rubber material is installed between the cylinder and the pressing ring, and is fastened by nut.The pressing ring exerts extrusion force, one action is to make the sealing gasket tightly contact the outer surface of the cylinder, and the other action is to extrude the sealing ring into the thread groove of the bolt, so as to seal the dust in the cylinder.
[0003] However, there are two problems in actual use: first, during the lining installation process, the nut must reach the specified tightening torque, and the lining mounting hole position will be cracked along the mounting hole due to the extrusion force of the bolt, with a probability of about 1% to 2%.Second, dust leakage is common at the lining connection position, although it is not visible dust leakage, but after a few hours, a layer of dust is deposited around the steel ball mill, which pollutes the site environment and has certain safety hazards.
[0004] Therefore, how to provide a bolt piece connection steel ball mill liner and cylinder pressure containment sealing structure that can prevent mounting hole cracking and improve sealing is a problem that needs to be solved by those skilled in the art. UTILITY MODEL CONTENTS
[0005] Therefore, the utility model provides a bolt piece connection steel ball mill liner and cylinder pressure containment sealing structure, to solve the above technical problems.
[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:
[0007] A kind of pressure containment sealing structure of bolt piece connection steel ball mill liner and cylinder, including cylinder and lining, the lining is fastened on the cylinder by lining bolt;
[0008] The outer wall of the taper transition section of the liner bolt is provided with a bushing between the wall surface of the taper transition hole section of the liner.
[0009] The cylindrical section of the liner bolt extends outside the mounting hole of the cylinder and the liner, and the inner wall surface of the gasket sleeved on the liner bolt is attached to the outer wall surface of the cylindrical section of the liner bolt.
[0010] Through the above technical scheme, the utility model solves the problems of liner fragmentation and dust leakage, improves the service life of the liner, reduces the maintenance workload of the steel ball mill, improves the operating site environment of the steel ball mill, and has important significance for improving the operating safety of the steel ball mill.
[0011] Preferably, in the above-mentioned pressure-bearing sealing structure for connecting the liner plate and the cylinder of the steel ball mill by using a bolt, the outer shape of the bushing is consistent with the outer shape of the taper transition section of the liner bolt, and the bushing is made of aluminum material.
[0012] Preferably, in the above-mentioned pressure-bearing sealing structure for connecting the liner plate and the cylinder of the steel ball mill by using a bolt, the thickness of the bushing is between 0.5 and 1 mm.
[0013] Preferably, in the above-mentioned pressure-bearing sealing structure for connecting the liner plate and the cylinder of the steel ball mill by using a bolt, the included angle of the taper transition section of the liner bolt and the included angle of the taper transition hole section of the liner are both between 90° and 120°.
[0014] Preferably, in the above-mentioned pressure-bearing sealing structure for connecting the liner plate and the cylinder of the steel ball mill by using a bolt, the liner bolt is fixed by a nut, and the nut is connected with the threaded section of the liner bolt.
[0015] Preferably, in the above-mentioned pressure-bearing sealing structure for connecting the liner plate and the cylinder of the steel ball mill by using a bolt, a pressing ring is sleeved on the liner bolt, and the pressing ring is tightly pressed on the end surface of the gasket by the nut.
[0016] Preferably, in the above-mentioned pressure-bearing sealing structure for connecting the liner plate and the cylinder of the steel ball mill by using a bolt, the cylindrical section of the liner bolt does not exceed the thickness range of the pressing ring.
[0017] Preferably, in the above-mentioned pressure-bearing sealing structure for connecting the liner plate and the cylinder of the steel ball mill by using a bolt, the number of the nuts is two.
[0018] Preferably, in the above-mentioned pressure-bearing sealing structure for connecting the liner plate and the cylinder of the steel ball mill by using a bolt, the hole diameter of the mounting hole of the cylinder is greater than the inner ring hole diameter of the gasket and smaller than the outer diameter of the gasket.
[0019] Preferably, in the pressure-bearing sealing structure for connecting the steel ball mill liner plate and the cylinder by using the bolt, the sealing gasket is made of rubber.
[0020] Compared with the prior art, the pressure-bearing sealing structure for connecting the steel ball mill liner plate and the cylinder by using the bolt has the following beneficial effects:
[0021] 1. Prevents the liner plate from being broken: by increasing the transition angle between the liner plate bolt and the liner plate to 90-120 degrees, the extrusion force on the liner plate mounting hole is reduced, thereby reducing the risk of the liner plate being broken.
[0022] 2. Improves the sealing performance: the aluminum bushing is added between the outer wall of the conical transition section of the liner plate bolt and the wall surface of the conical transition hole section of the liner plate, the contact state of the liner plate and the liner plate bolt is improved, stress concentration is avoided, and the problem of the liner plate being broken is solved.
[0023] 3. Improves the contact state: the aluminum bushing has good ductility, which can make the pressure on the liner plate mounting hole more dispersed, and avoid stress concentration.
[0024] 4. Increases the service life of the liner plate: through the above measures, the service life of the liner plate is improved, and the maintenance workload of the steel ball mill is reduced.
[0025] 5. Improves the operating environment: reduces the dust leakage around the steel ball mill, improves the environment of the steel ball mill operating site, and reduces environmental pollution.
[0026] 6. Improves the operating safety: by reducing dust leakage, the safety hazard is reduced, and the operating safety of the steel ball mill is improved.
[0027] 7. Improves the sealing structure: the sealing state between the sealing gasket and the liner plate bolt is changed, the adverse effect of the thread on the sealing effect is avoided, and reliable sealing effect is ensured.
[0028] 8. Optimizes the bolt design: by lengthening the cylindrical section of the liner plate bolt and thickening the pressure ring, it is ensured that the thread section exceeds the range of the sealing gasket, thereby improving the sealing performance. BRIEF DESCRIPTION OF DRAWINGS
[0029] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and those skilled in the art can obtain other drawings according to the provided drawings without creating any creative labor.
[0030] Figure 1The drawing is a structural schematic view of the connection between the cylinder and the liner in the prior art.
[0031] Figure 2 The drawing is a structural sectional view of the connection between the cylinder and the liner in the prior art.
[0032] Figure 3 The drawing is a three-dimensional sectional view of the liner mounting hole in the prior art.
[0033] Figure 4 The drawing is a structural schematic view of the liner bolt in the prior art.
[0034] Figure 5 The drawing is a force analysis diagram of the liner mounting hole.
[0035] Figure 6 The drawing is a structural sectional view of the connection between the cylinder and the liner provided by the present application.
[0036] Figure 7 The drawing is a schematic view of the liner bushing after installation.
[0037] Figure 8 The drawing is a structural schematic view of the liner bushing provided by the present application.
[0038] Figure 9 The drawing is a schematic view of the deformation of the sealing gasket when compressed.
[0039] Among them:
[0040] 1-cylinder;
[0041] 2-liner;
[0042] 21-waist hole section; 22-tapered transition hole section; 23-cylindrical hole section;
[0043] 3-liner bolt;
[0044] 31-waist column section; 32-tapered transition section; 33-cylindrical section; 34-threaded section;
[0045] 4-sealing gasket;
[0046] 5-pressing ring;
[0047] 6-nut;
[0048] 7-liner bushing. DETAILED DESCRIPTION
[0049] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.
[0050] Referring to the drawings Figure 6 to the drawings Figure 9 The utility model discloses a kind of pressure-bearing sealing structure of steel ball mill liner and cylinder connected by bolt piece, including cylinder 1 and liner plate 2, liner plate 2 is fastened on cylinder 1 by liner plate bolt 3;
[0051] The outer side wall of the conical transition section 32 of the liner plate bolt 3 is provided with a bushing 7 between the wall surface of the conical transition hole section 22 of the liner plate 2.
[0052] The cylindrical section 33 of the liner plate bolt 3 extends outside the mounting hole of the cylinder 1 and the liner plate 2, and the inner wall surface of the gasket 4 sleeved on the liner plate bolt 3 is attached to the outer wall surface of the cylindrical section 33 of the liner plate bolt 3.
[0053] In this embodiment, the reason for the liner plate cracking is analyzed:
[0054] The material of the steel ball mill liner is high chromium cast iron or wear-resistant cast steel, with a hardness of HRC50 or above, and has very high wear resistance, but the toughness of the material is poor and the ductility is not good.
[0055] The mounting hole position is under too much stress:
[0056] The conical transition hole section 22 of the liner plate 2 is in contact with the conical transition section 32 of the liner plate bolt 3, the transition section angle θ, the liner plate bolt 3 is subjected to tension N, and the vertical contact surface pressure F is generated on the conical transition hole section 22, see Figure 5 F=0.5N / sin(θ / 2). The smaller the transition section angle θ, the greater the F generated. For different angles, F and N are only seen in the table below.
[0057] Serial number θ F 1 60° N 2 90° 0.707N 3 120° 0.577N 4 150° 0.518N
[0058] The liner plate 2 and the liner plate bolt 3 are partially in contact, causing stress concentration:
[0059] The liner plate 2 is a cast part, the size tolerance and shape tolerance of the mounting hole are much larger than those of a machined part, and the roughness of the inner surface of the cast mounting hole is also worse than that of a machined part. The liner plate bolt 3 is a forged part, the size tolerance and shape tolerance are better than those of a cast part, but worse than those of a machined part. Due to the poor size accuracy of the fitting surface of the liner plate 2 and the liner plate bolt 3, and the poor roughness of the fitting surface, the liner plate 2 and the liner plate bolt 3 are partially in contact, and stress concentration is generated.
[0060] Through the above analysis, the angle between the liner plate 2 and the conical transition section 32 in the embodiment is increased to between 90° and 120°. The specific angle is related to the performance of the material. The smaller the toughness of the material, the larger the angle. By increasing the angle of the transition section, the extrusion force on the liner plate mounting hole is reduced, thereby reducing the risk of liner plate fragmentation. An aluminum bushing 7 is added between the liner plate 2 and the liner plate bolt 3. See Figures 6 to 8 The material of the aluminum bushing 7 is much softer than that of the liner plate 2 and the liner plate bolt 3, and the aluminum bushing 7 has good ductility and is easily deformed after being extruded. It has a good filling effect on the gap at the contact position of the liner plate 2 and the liner plate bolt 3, so that the pressure on the liner plate mounting hole is more dispersed, and stress concentration is avoided. According to the size and shape tolerance of the liner plate 2 and the liner plate bolt 3, the thickness of the bushing 7 is determined to be between 0.5 and 1 mm. These two measures have obvious effect on solving the problem of liner plate fragmentation.
[0061] In the embodiment, the cause of dust leakage is analyzed as follows:
[0062] It can be confirmed that the dust is leaked from the connection position of the liner plate 2, that is, the sealing effect of the existing liner plate connection structure is not good. From Figure 2 It can be seen that as long as the joint position of the gasket 4 and the outer surface of the cylinder 1 and the joint position of the gasket 4 and the liner plate bolt 3 are well sealed, there will be no dust leakage. The joint surface of the gasket 4 and the outer surface of the cylinder 1 is an annular plane, and the gasket 4 is tightly pressed against the outer surface of the cylinder 1 to achieve good sealing effect. Therefore, the problem lies in the joint position of the gasket 4 and the liner plate bolt 3. Figure 9 A schematic view of the deformation of the gasket when it is compressed. When subjected to the pressure N of the compression ring 5, the gasket 4 is tightly pressed against the outer surface of the cylinder 1, the thickness H of the gasket 4 becomes smaller, the gasket 4 made of rubber material is axially extruded, and starts to deform radially, causing the inner hole d of the gasket 4 to become smaller and gradually embedded into the thread groove. In the ideal state, the gasket 4 completely fills the thread groove, and the sealing of the thread is achieved. However, when a part of the gasket 4 is embedded into the thread, the thread starts to prevent the axial deformation of the gasket, and in severe cases, the inner hole of the gasket 4 is torn by the thread. Since the thread prevents the axial deformation of the inner hole of the gasket 4, it also prevents the embedding of the gasket 4 into the thread groove, which ultimately leads to poor sealing effect and dust leakage from the thread.
[0063] In the embodiment, the following measures are taken for dust leakage: the first step is to extend the cylindrical section 33 of the backing plate bolt 3 to ensure that the threaded section exceeds the range of the gasket 4. The second step is to thicken the thickness of the compression ring 5 to ensure that the cylindrical section 33 does not exceed the thickness range of the compression ring 5 after the nut 6 is tightened.
[0064] The backing plate connecting structure provided by the embodiment is shown in Figure 1 Compared with the original backing plate connecting structure, the utility model increases the angle between the backing plate and the backing plate bolt to 90-120 degrees, reduces the extrusion force of the backing plate bolt on the backing plate mounting hole, increases the aluminum bushing between the backing plate and the backing plate bolt, improves the contact state of the backing plate and the backing plate bolt, avoids stress concentration, and solves the problem of backing plate fragmentation. The utility model changes the sealing state between the gasket and the backing plate bolt, the original structure is to seal the threaded section, the utility model is to seal the cylindrical section, avoids the adverse effect of threads on the sealing effect, and thus ensures reliable sealing effect.
[0065] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed by the embodiments, since it corresponds to the method disclosed by the embodiments, the description is relatively simple, and the related parts can be referred to the method part.
[0066] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the utility model. Various modifications to the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A pressure-bearing sealing structure for connecting a steel ball mill liner plate and a cylinder by a bolt, comprising a cylinder (1) and a liner plate (2), wherein the liner plate (2) is fastened to the cylinder (1) by a liner plate bolt (3); characterized in that: an outer wall of a tapered transition section (32) of the liner plate bolt (3) and a wall surface of a tapered transition hole section (22) of the liner plate (2) are provided with a bushing (7); a cylindrical section (33) of the liner plate bolt (3) extends out of an installation hole of the cylinder (1) and the liner plate (2), and an inner wall surface of a sealing gasket (4) sleeved on the liner plate bolt (3) is in contact with an outer wall surface of the cylindrical section (33) of the liner plate bolt (3). The bushing (7) has the same shape as the tapered transition section (32) of the liner plate bolt (3) and is made of aluminum. The thickness of the bushing (7) is between 0.5 and 1 mm.
2. A pressure-bearing sealing structure for connecting a steel ball mill liner plate and a cylinder by a bolt according to claim 1, characterized in that, The included angle of the tapered transition section (32) of the liner plate bolt (3) and the included angle of the tapered transition hole section of the liner plate (2) are both between 90° and 120°.
3. A pressure seal structure for connecting a steel ball mill liner plate and a cylinder by a bolt according to claim 2, characterized in that, The liner plate bolt (3) is locked and fixed by a nut (6), and the nut (6) is connected with a threaded section of the liner plate bolt (3).
4. The pressure seal structure of claim 1, wherein the bolted connection between the steel ball mill liner and the cylinder is characterized by, A pressing ring (5) is sleeved on the liner plate bolt (3), and the pressing ring (5) is tightly pressed on an end surface of the sealing gasket (4) by the nut (6).
5. A pressure seal structure for connecting a steel ball mill liner plate and a cylinder by a bolt according to claim 1, characterized in that, The cylindrical section (33) of the liner plate bolt (3) does not exceed the thickness range of the pressing ring (5).
6. A pressure seal structure for connecting a steel ball mill liner plate and a cylinder by a bolt according to claim 5, characterized in that, The number of the nuts (6) is two.
7. A pressure seal structure for connecting a steel ball mill liner plate and a cylinder by a bolt according to claim 6, characterized in that, The hole diameter of the installation hole of the cylinder (1) is greater than the inner ring hole diameter of the sealing gasket (4) and less than the outer diameter of the sealing gasket (4).
8. A pressure seal structure for connecting a steel ball mill liner plate and a cylinder by a bolt according to claim 5, characterized in that, The sealing gasket (4) is made of rubber.
9. A pressure seal structure for connecting a steel ball mill liner plate and a cylinder by a bolt according to claim 1, characterized in that, 10. A pressure seal structure for connecting a steel ball mill liner plate and a cylinder by a bolt according to claim 1, characterized in that,