CN114060384B - Bolt sealing structure of rod mill barrel and rod mill - Google Patents
Bolt sealing structure of rod mill barrel and rod mill Download PDFInfo
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- CN114060384B CN114060384B CN202111160673.XA CN202111160673A CN114060384B CN 114060384 B CN114060384 B CN 114060384B CN 202111160673 A CN202111160673 A CN 202111160673A CN 114060384 B CN114060384 B CN 114060384B
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- rod
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- 238000007789 sealing Methods 0.000 title claims abstract description 176
- 238000009434 installation Methods 0.000 claims abstract description 31
- 230000002093 peripheral effect Effects 0.000 claims description 13
- 230000007704 transition Effects 0.000 claims description 13
- 229920001875 Ebonite Polymers 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 3
- 230000006835 compression Effects 0.000 abstract description 24
- 238000007906 compression Methods 0.000 abstract description 24
- 230000000694 effects Effects 0.000 abstract description 11
- 230000008901 benefit Effects 0.000 abstract description 7
- 239000003245 coal Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000012423 maintenance Methods 0.000 description 6
- 239000004570 mortar (masonry) Substances 0.000 description 6
- 239000002002 slurry Substances 0.000 description 6
- 239000003250 coal slurry Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 210000004907 gland Anatomy 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000012840 feeding operation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B33/00—Features common to bolt and nut
- F16B33/004—Sealing; Insulation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/22—Lining for containers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention relates to a rod mill, and discloses a bolt sealing structure of a rod mill cylinder, which comprises the rod mill cylinder, a buffer cushion and a lining plate which are sequentially arranged from outside to inside, wherein screw installation through holes are formed in the cylinder, the buffer cushion and the lining plate, a screw is arranged in the screw installation through holes, one end of the screw, which is close to the rod mill cylinder, is connected with a plurality of fastening nuts, an axial sealing pair is arranged on the screw, the axial sealing pair comprises a plurality of sealing rings, supporting rings and sealing compression rings, the supporting rings and the sealing compression rings are arranged on two sides of the sealing rings, and each sealing ring is arranged in the installation through holes so as to enable the fastening nuts to be in sealing connection with the rod mill cylinder. In addition, the invention also discloses a rod mill. The bolt sealing structure of the rod mill cylinder body has the advantages of simple structure, good sealing effect and high economic benefit.
Description
Technical Field
The invention relates to a rod mill, in particular to a bolt sealing structure of a rod mill cylinder. The invention also relates to a rod mill.
Background
In the field of coal chemical industry or other coal deep processing, raw material coal is often required to be processed into coal water slurry through a rod mill, so that the rod mill is widely used in the coal chemical industry.
The rod mill in the prior art mainly comprises a chute feeding device, a rotating part, a discharging device, a driving device, a lubricating system, an electric control system and the like. The rotary part is a main body core part of the rod mill and consists of a rod mill cylinder, a feeding end cover, a lining plate and other parts, the lining plate is connected to the rod mill cylinder by bolts, and a drum-shaped rubber sealing gasket is generally adopted between the rod mill cylinder and the bolts for sealing, and the sealing structure schematic diagram is shown in figure 1: the sealing structure is characterized in that a sealing gasket and a sealing gland are sleeved into a sealing jacket and fastened through a fastening nut, the sealing gasket is tightly pressed by the sealing gland, and the sealing gasket and the rod mill barrel form end face sealing on the rod mill barrel to prevent water-coal slurry in the rod mill barrel from leaking out through a bolt hole so as to achieve a sealing effect. However, when the rod mill in the prior art works, raw coal, water and additives enter the rod mill cylinder together, the rod mill cylinder provided with the steel rod is driven by the main motor to rotate, and the water-coal-slurry is prepared through impact grinding between rods and a lining plate. Taking a rod mill with the specification of phi 4000 multiplied by 6000 as an example, when the equipment runs, 100 tons of steel rods in the rod mill cylinder roll down from top to bottom, impact a lining plate in the rod mill cylinder, and the rod mill cylinder violently vibrates to generate violent impact on a sealing structure, so that the problems of sliding of the lining plate, deflection of bolts, deformation of bolt holes and the like are extremely easy to occur after 1 to 2 months after a sealing ring is replaced, finally, a fastening nut is loosened, the pretightening force between the sealing ring and the rod mill cylinder is reduced or even separated, the sealing function is invalid, and coal water slurry in the cylinder leaks outwards from the bolt holes of the cylinder.
The slurry leakage of the barrel body of the rod mill not only wastes a large amount of raw material coal, but also seriously affects the stable operation of equipment, reduces the service life of the equipment, and simultaneously causes floating of plant coal dust after the coal water slurry is dried and fixed, so that flash explosion risk exists. After the leaked coal water slurry is air-dried, the leaked coal water slurry needs to be manually cleaned, so that the expenditure of labor cost is increased. After the rod mill cylinder body leaks, the rod mill cylinder body is stopped for leakage elimination, and 720 bolt sealing points are arranged on each rod mill cylinder body, so that the maintenance workload is large, the replacement of consumed spare parts is more, and the cost is higher. According to the operation standard, the main motor of the rod mill is required to be powered off every time leakage is eliminated, power is supplied after the leakage elimination operation is finished, the voltage of the main motor of the rod mill is 6kV, the main motor is frequently powered off and started and stopped after maintenance, and serious potential safety hazards exist.
In view of the foregoing, it is desirable to provide a bolt seal structure for a rod mill barrel that solves or overcomes the above-mentioned problems.
Disclosure of Invention
The invention aims to solve the technical problem of providing a bolt sealing structure of a rod mill cylinder, which has the advantages of simple structure, convenience in installation and good sealing effect.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the utility model provides a bolt seal structure of rod mill barrel, includes from outside-in rod mill barrel, blotter and the welt that sets gradually, the barrel the blotter with be equipped with screw rod installation through-hole on the welt, be equipped with the screw rod in the screw rod installation through-hole, the screw rod be close to the one end of rod mill barrel is connected with a plurality of fastening nut, be equipped with axial seal pair on the screw rod, axial seal pair includes a plurality of sealing washer and locates support ring and the sealing ring of the both sides of sealing washer, each the sealing washer is located in the installation through-hole, so that fastening nut with form into sealing connection between the rod mill barrel.
Preferably, the screw rod sequentially comprises a screw rod end part, a step part, a sealing ring installation part and a threaded connection part, a conical transition surface is formed between the step part and the sealing ring installation part, a chamfer is formed on the inner side surface of one end of the supporting ring, the chamfer can be abutted against the conical transition surface, one end surface of the supporting ring far away from the chamfer is suitable for being abutted against one end surface of the sealing ring, wherein a plurality of through holes are formed in the screw rod end part, the step part and the sealing ring installation part, one end of each through hole is arranged on the end surface of the screw rod end part, and the other end of each through hole is arranged on the peripheral surface of the sealing ring installation part.
Preferably, the screw end is formed as a truncated cone gradually inclined from the outer peripheral edge toward the central axis, the end face of the screw end is formed as a plane, and the end face of the screw end is lower than the inner peripheral face of the liner plate.
Preferably, the tapered transition surface is formed to be gradually inclined from one end near the tapered transition surface toward the central axis.
More preferably, the number of the sealing rings is 3-5.
Preferably, the sealing compression ring comprises a compression ring body and a compression ring boss connected with the compression ring body, the end face of the compression ring boss is suitable for being abutted against one end face of the sealing ring, and one end face of the compression ring body, which is close to the compression ring boss, is suitable for being abutted against the outer peripheral face of the rod mill barrel.
Preferably, a compression ring through hole through which the seal ring mounting part and the threaded connection part of the screw rod pass is formed in the central region of the compression ring boss.
Preferably, the sealing ring is a soft rubber sealing ring or a polytetrafluoroethylene sealing ring.
Preferably, the support ring is formed from hard rubber or tetrafluoroethylene.
A rod mill comprising a bolt seal arrangement for a rod mill barrel according to any one of the preceding claims.
Through the technical scheme, the bolt sealing structure of the rod mill barrel comprises the rod mill barrel, the buffer cushion and the lining plate which are sequentially arranged from outside to inside, screw installation through holes are formed in the barrel, screws are arranged in the screw installation through holes, one end of each screw, which is close to the rod mill barrel, is connected with a plurality of fastening nuts, an axial sealing pair is arranged on each screw, each axial sealing pair comprises a plurality of sealing rings, supporting rings and sealing compression rings, the supporting rings and the sealing compression rings are arranged on two sides of each sealing ring, and each sealing ring is arranged in each installation through hole so that sealing connection can be formed between each fastening nut and each rod mill barrel. According to the bolt sealing structure of the rod mill barrel, the axial sealing pair is arranged on the screw rod and comprises the plurality of sealing rings, the plurality of sealing rings are arranged in the screw rod installation through holes, and in the fastening process of the fastening nut, force is applied to the supporting ring and the sealing compression ring, so that the purpose of applying axial pressure to the plurality of sealing rings is achieved, the purpose of sealing connection between the screw rod and the rod mill barrel is achieved, and the bolt sealing structure of the rod mill barrel is simple in structure, convenient to install and good in sealing effect.
Drawings
FIG. 1 is a schematic structural view of one particular embodiment of a bolt seal arrangement for a rod mill barrel of the prior art;
FIG. 2 is a schematic view of one embodiment of a bolt seal arrangement for a rod mill barrel according to the present invention;
FIG. 3 is a schematic view of the structure of one embodiment of the screw according to the present invention;
FIG. 4 is a schematic view of the structure of one embodiment of the support ring of the present invention;
fig. 5 is a schematic view of a seal ring according to an embodiment of the present invention.
Description of the reference numerals
1 rod mill barrel 2 buffer pad
3 lining board 4 screw rod mounting through hole
5 screw 501 screw end
502 step 503 sealing ring mounting part
504 threaded connection 505 tapered transition surface
506 through hole 6 fastening nut
7 axial seal pair 701 sealing ring
702 support ring 7021 chamfer
703 sealing press ring 7031 press ring body
7032 clamping ring boss 7033 clamping ring through hole
8 seal jacket 9 seal gland
Detailed Description
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without collision.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; either directly or indirectly via an intermediate medium, or in communication with each other or in interaction with each other. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
As shown in fig. 2, in one aspect, the present invention provides a bolt sealing structure of a rod mill barrel, comprising a rod mill barrel 1, a buffer pad 2 and a liner plate 3 sequentially arranged from outside to inside, wherein screw installation through holes 4 are formed in the barrel 1, the buffer pad 2 and the liner plate 3, a screw 5 is arranged in the screw installation through holes 4, one end of the screw 5, which is close to the rod mill barrel 1, is connected with a plurality of fastening nuts 6, an axial sealing pair 7 is arranged on the screw 5, the axial sealing pair 7 comprises a plurality of sealing rings 701, and a supporting ring 702 and a sealing compression ring 703 which are arranged on two sides of the sealing rings 701, each sealing ring 701 is arranged in the installation through holes 4, so that the fastening nuts 6 and the rod mill barrel 1 can form sealing connection.
As can be seen from fig. 2, in the bolt sealing structure of the rod mill cylinder according to the present invention, the axial sealing pair 7 is provided on the fastening nut 6, and the plurality of seal rings 701 of the axial sealing pair 7 are all provided in the screw mounting through hole 4, the screw 5 penetrates from one end of the liner 3 through the screw mounting through hole 4, the fastening nut 6 is screwed by the plurality of fastening nuts 6, the fastening nut 6 on the inner side abuts against the seal pressing ring 703, and the plurality of seal rings 701 can form an axial seal in the screw mounting through hole 4 after receiving an axial pressure, thereby achieving a sealing function by the axial sealing pair 7. Meanwhile, the axial sealing pair 7 is arranged in the screw mounting through hole 4, so that the sealing function can be met, the screw 5 can be supported, and compared with the bolt sealing structure of the rod mill barrel in the prior art in fig. 1, the screw 5 can be effectively prevented from shaking greatly in the screw mounting through hole 4, and the service life of the sealing ring 701 is further effectively prolonged.
In the invention, the support ring 702 is arranged at one end of the sealing ring 701 far away from the sealing compression ring 703, and the support ring 702 not only can play a supporting role on the sealing ring 701, but also can effectively prevent the sealing ring 701 from losing from the clearance between the screw 5 and the screw mounting through hole 4 after deformation to influence the service life of the sealing ring 701. Moreover, the sealing ring 701 is clamped between the supporting ring 702 and the sealing compression ring 703, so that the sealing ring 701 can be protected to a certain extent, and the service life of the sealing ring 701 is effectively prolonged.
As a preferred embodiment of the present invention, as shown in fig. 4, the screw 5 includes a screw end 501, a step 502, a seal ring mounting portion 503, and a screw connection portion 504 in this order, a tapered transition surface 505 is formed between the step 502 and the seal ring mounting portion 503, a chamfer 7021 is formed on an inner side surface of one end of the support ring 702, the chamfer 7021 is capable of abutting against the tapered transition surface 505, an end surface of the support ring 702 remote from the chamfer 7021 is adapted to abut against an end surface of the seal ring 701, wherein
The screw end 501, the step 502, and the seal ring mounting portion 503 are formed with a plurality of through holes 506, and one end of each through hole 506 is provided on an end face of the screw end 501, and the other end is provided on a peripheral face of the seal ring mounting portion 503.
More preferably, the screw end 501 is formed as a truncated cone gradually inclined from the outer peripheral edge toward the central axis, the end face of the screw end 501 is formed as a plane, and the end face of the screw end 501 is lower than the inner peripheral face of the backing plate 3.
Further preferably, the tapered transition surface 505 is formed to be gradually inclined from one end near the tapered transition surface 505 toward the central axis.
As shown in fig. 3, in the present invention, unlike the screw 5 of the prior art, the screw 5 of the present invention includes a screw end 501, a step 502, a seal ring mounting portion 503 and a screw connection portion 504, the screw end 501 is formed as a circular truncated cone, and the diameter gradually decreases from one end far from the step 502 to one end of the step 502, and a gap exists between the step 502 and the screw mounting through hole 4 for easy mounting, and due to the existence of the gap, the screw 5 is rocked after being mounted in the screw mounting through hole 4, thereby affecting the service life and sealing effect, and therefore, the support ring 702, the seal ring 701 and the pressure ring boss 7032 of the sealing pressure ring 703 of the present invention are sleeved on the screw 5, and the outer circumferential surface is abutted with the inner circumferential surface of the screw mounting through hole 4, thereby restricting the rocking of the screw 5, prolonging the service life and enhancing the sealing effect.
In addition, during use, a small amount of clearance is formed between the screw 5 and the seal ring 701 after long-term use, so that mortar in the barrel of the rod mill may remain between the screw 5 and the seal ring 701 along the clearance, friction between the screw 5 and the seal ring 701 may be increased during long-term use, and abrasion of the seal ring 701 is accelerated, so that a plurality of through holes 506 are added to the screw 5, one end of each through hole is disposed on the screw end 501, preferably on an end surface of the screw end 501, and the other end of each through hole 506 is disposed on the peripheral surface of the seal ring mounting portion 503, preferably at a position where the seal ring 701 near one end of the screw end 501 is abutted, so that the first seal ring 701 can seal the through hole 506. It is conceivable that, in the use process, if a small amount of mortar leaks through the gap between the screw 5 and the lining plate 3, the mortar can permeate back into the cylinder through the through hole 506 by utilizing the gravity effect, so that the mortar is prevented from being solidified between the bolt 5 and the sealing ring 701 for a long time, and certain abrasion is caused to the sealing ring 701 and even the bolt 5, and the use effect is better.
Of course, the function of the through hole 506 may be understood that when a small amount of mortar leaking between the screw 5 and the sealing ring 701 is condensed, the mortar is ground into powder by the screw 5, and the powder may be discharged through the through hole 506, so as to avoid damage to the sealing ring 701 due to long-term retention between the screw 5 and the sealing ring 701.
As another preferred embodiment of the present invention, the number of the sealing rings 701 is 3 to 5. Of course, the number of the sealing rings 701 may be less than 3 or more than 5 according to the actual installation requirement and the thickness of the sealing rings 701, which are all within the protection scope of the present invention.
As still another preferred embodiment of the present invention, as shown in fig. 5, the seal pressure ring 703 includes a pressure ring body 7031 and a pressure ring boss 7032 connected to the pressure ring body 7031, the end face of the pressure ring boss 7032 is adapted to abut against one end face of the seal ring 701, and the end face of the pressure ring body 7031, which is adjacent to the pressure ring boss 7032, is adapted to abut against the outer peripheral face of the rod mill cylinder 1.
More preferably, the center region of the press ring boss 7032 is formed with a press ring through hole 7033 adapted to pass through the seal ring mounting portion 503 and the screw connection portion 504 of the screw 5.
As a specific structural form of the present invention, the seal 701 is a soft rubber seal or a polytetrafluoroethylene seal.
More specifically, the support ring 702 is molded from hard rubber or tetrafluoroethylene.
The invention also provides a rod mill, which comprises the bolt sealing structure of the rod mill cylinder according to any one of the technical schemes.
The installation process of the bolt sealing structure of the rod mill barrel body comprises the following steps: firstly, the position of a lining plate 3 is adjusted in a rod mill cylinder 1, a screw 5 is inserted into a screw installation through hole 4 from the inner side, and the central line of the screw 5 is basically coincident with the central axis of the screw installation through hole 4; secondly, the supporting ring 702, the plurality of sealing rings 701 and the sealing compression ring 703 are sequentially sleeved on the screw 5, and the fastening nuts 6 are sequentially screwed on, so that the screw 5 is ensured to have enough pretightening force to fix the lining plate 3. After the bolt sealing structure of the rod mill cylinder is completely installed, production water is added into the rod mill, the rod mill is subjected to test running according to the normal rotating speed, so that a steel rod in the rod mill impacts the lining plate 3, the rod mill is stopped for about 1 hour to run, the screw 5 is fastened again, and the normal feeding operation can be realized after the completion.
When the axial sealing pair 7 in the bolt sealing structure of the rod mill barrel is found to be invalid, the fastening nut 6 is selected and a new sealing ring 701 is replaced. In the replacement process, the supporting ring 702 still remains in the screw mounting through hole 4, so that a certain maintenance effect is provided for the screw 5, the replacement operation difficulty is effectively reduced, and the working efficiency is improved.
It should be noted that the present invention can effectively solve the following several important problems:
firstly, the bolt sealing structure of the rod mill barrel can effectively ensure that the rod mill still can maintain good sealing effect in the gradual loosening process of the fastening nut 6 by arranging the plurality of sealing rings 701, the supporting rings 702 and the compression ring bosses 7032 of the sealing compression rings 703 of the axial sealing pair 7 in the screw installation through holes 4, and the screw 5 passes through the axial sealing pair 7 to effectively control the problems of sliding of the rod mill lining plate 3, deflection of the screw 5 and the like, thereby eliminating the leakage of the water-coal-slurry of the screw installation through holes 4 on the rod mill barrel.
Secondly, the bolt sealing structure of the rod mill barrel body can not only reconstruct the existing rod mill, but also be suitable for manufacturing and processing new equipment in a manufacturing plant. Meanwhile, the bolt sealing structure of the rod mill cylinder body can be applied to sealing structures of rotary type mixing equipment with similar structures in other fields, and has wide popularization value.
As a specific embodiment of the invention, the specific technical scheme of the invention is as follows:
1. diameter D of through hole 4 by screw of rod mill cylinder 1 Thickness B of rod mill barrel 1 1 On the barrel of the rod mill with specification of phi 4000 multiplied by 6000 as a reference, the diameter D of the screw installation through hole 4 1 The thickness B of the rod mill cylinder 1 is phi 38-41 mm 1 36-40 mm.
2. The size design of the screw 5: wherein the size of the screw end 501 of the screw 5 is determined according to the size of the inner hole of the lining plate 3, and the root of the thread from the joint of the screw end 501 and the step 502 to the threaded connection 504 is B 2 The length of the step 502 is designed to be 0.3B 2 A gap of about 2mm in diameter is formed between the outer peripheral surface of the stepped portion 502 and the screw mounting through hole 4, and thus the tableThe diameter of the step 502 is designed as D 2 ＝D 1 2, the installation of the lining plate 3 is facilitated, and meanwhile, the limited shaking space of the screw 5 in the screw installation through hole 4 is ensured. The tapered transition surface 505 is designed as a chamfer of 6×30 °, the step portion 502 is transited to the seal ring mounting portion 503, the seal ring mounting portion 503 is designed as a polish rod equal in size to the thread outer diameter of the threaded connection portion 504, and the diameter of the seal ring mounting portion 503 is designed as D 3 ＝D 2 -6, the thread gauge of the threaded connection 504 is M (D 3 ) The length is sufficient to satisfy the thickness of the two fastening nuts 6.
3. The size design of the sealing ring 701: the sealing ring 701 mainly plays a sealing role, and can be formed soft rubber rings, formed polytetrafluoroethylene filler rings and the like, and the specification is selected as follows: phi D 4 And the X is 5 multiplied by 3mm, and 3 to 5 sealing devices are arranged in one group.
4. Design of the support ring 702: the supporting ring 702 is made of nonmetal materials such as hard rubber or tetrafluoro, has the same specification and size as the sealing ring 701, and mainly plays a supporting role to prevent the sealing ring 701 from losing from a gap between the screw 5 and the screw mounting through hole 4 after deformation, thereby influencing the sealing life.
Wherein, D is as follows 1 Indicating the diameter of the screw mounting through hole 4, B 1 Representing the thickness of the barrel 1 of the rod mill, D 2 Indicating the diameter of the step 502, B 2 Represents the length of the thread root from the junction of the screw end 501 and the step 502 to the thread connection 504, D 3 D represents the diameter of the seal ring mounting portion 503 4 The outer diameter of the seal 701 is shown, and the diameter D of the screw mounting through hole 4 is shown 1 And on the contrary.
According to the actual condition of operation, the rod mill of the invention is generally maintained for the first time within two weeks after normal operation, and the screw 5 is comprehensively fastened. And the screw 5 is comprehensively fastened every month or every two months according to the actual conditions, so that the effectiveness of the bolt sealing structure of the rod mill barrel is ensured. If leakage occurs in the normal operation process, only the fastening nut 6 and the sealing compression ring 703 need to be disassembled, a proper amount of sealing rings 701 are added or the sealing rings 701 are replaced according to the requirements, and the fastening is finished. If the screw 5 is severely inclined and the sealing ring 701 cannot be added, the position of the lining plate 3 needs to be adjusted, and the supporting ring 702, the sealing compression ring 703, the sealing ring 701, the screw 5 and other components are replaced according to actual conditions.
Compared with the sealing structure in the prior art, the invention has the following advantages:
first, seal effectiveness: the sealing structure of the rod mill cylinder has good sealing effect in the normal running process of the rod mill. Because the axial sealing pair 7 is in the axial direction and has a certain pre-tightening compression amount, the sealing structure is in a sealing effective state as long as the tensile deformation amount of the screw 5 or the loosening amount of the fastening nut 6 is not more than 5-8 mm. In the normal operation process of the rod mill, the stretching deformation of the screw 5 is small, and the loosening amount of the fastening nut 6 is mainly considered. After the rod mill runs for 3 months through field test, only 3-5 fastening nuts in 720 sealing structures on the rod mill are loosened to cause leakage, and inspection shows that the loosening of the fastening nuts 6 is excessive. Through normal maintenance, the accumulated service life of the sealing structure can reach more than 15 months.
Secondly, the screw 5 is supported by the supporting ring 702, the sealing ring 701 and the sealing compression ring 703, so that the problems of sliding of the lining plate 3 and deflection of the screw 5 can be effectively controlled, and the sealing stability is positively influenced. After the leakage of coal slurry at the installation through hole of the screw 5 is effectively eliminated, the safety and environmental protection risks caused by coal powder drifting due to the leakage of the coal slurry are reduced. Meanwhile, the maintenance amount is reduced, the maintenance labor consumption is reduced, and the spare part cost consumption is reduced.
Thirdly, the economic benefit is good: compared with the traditional sealing structure, the parts used in the sealing structure of the rod mill barrel are greatly reduced, and the price is basically the same as the screw 5 is only subjected to local size adjustment. The conventional structure shown in fig. 1 mainly comprises three parts of a sealing gland 9, a sealing ring 701 and a sealing jacket 8, and the accumulated cost is about 85+55+125=265 yuan. The price of the single-group sealing structure in the sealing structure of the present invention shown in fig. 2 is mainly about 5+2×5+50=65 yuan for the three parts of the supporting ring 702, the sealing ring 701 and the sealing ring 703. A single set of seals can reduce the original cost by 265-65=200 yuan or so. Taking a bar mill with the specification of phi 4000 multiplied by 6000 as an example, the whole set of bar mill has the advantages of reducing the cost by about 200 multiplied by 720=14.4 ten thousand yuan, and having good economic benefit.
Fourth, better generalization: the bolt sealing structure of the rod mill barrel is simple and practical, can be used for on-site reconstruction construction, is also suitable for manufacturing and processing new equipment in a manufacturing plant, and can be popularized and used in the similar equipment. Meanwhile, the sealing device can also be applied to sealing of rotary mixing equipment with similar structures in other fields, and has wide popularization value.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (9)
1. The utility model provides a bolt seal structure of rod mill barrel, its characterized in that, including rod mill barrel (1), blotter (2) and welt (3) that set gradually from outside to inside, barrel (1) blotter (2) with be equipped with screw rod installation through-hole (4) on welt (3), be equipped with screw rod (5) in screw rod installation through-hole (4), the one end that is close to of screw rod (5) rod mill barrel (1) is connected with a plurality of fastening nut (6), be equipped with axial seal pair (7) on screw rod (5), axial seal pair (7) include a plurality of sealing washer (701) and locate support ring (702) and sealing washer (703) of the both sides of sealing washer (701), each sealing washer (701) are located in installation through-hole (4) to can make between fastening nut (6) with rod mill barrel (1) form sealing connection, screw rod (5) include screw rod tip (501), step (502), sealing washer installation department (504) and threaded connection step (504), sealing washer (503) form between the taper profile (503) in proper order in the one end (702) and support ring (503) form one end (702), the chamfer (7021) can be abutted against the conical transition surface (505), one end face, far away from the chamfer (7021), of the supporting ring (702) is suitable for being abutted against one end face of the sealing ring (701), a plurality of through holes (506) are formed in the screw end (501), the step portion (502) and the sealing ring mounting portion (503), one end of each through hole (506) is arranged on the end face of the screw end (501), and the other end of each through hole is arranged on the peripheral face of the sealing ring mounting portion (503).
2. The bolt seal structure of a rod mill cylinder according to claim 1, characterized in that the screw end (501) is formed as a truncated cone gradually inclined from an outer peripheral edge toward a central axis, an end face of the screw end (501) is formed as a plane, and an end face of the screw end (501) is lower than an inner peripheral face of the lining plate (3).
3. The bolt seal structure of a rod mill barrel according to claim 1, characterized in that the tapered transition surface (505) is formed to be gradually inclined from one end near the tapered transition surface (505) toward a central axis.
4. Bolt seal arrangement for rod mill barrels according to claim 1, characterized in that the number of sealing rings (701) is 3-5.
5. Bolt sealing structure of a rod mill barrel according to claim 1, characterized in that the sealing pressure ring (703) comprises a pressure ring body (7031) and a pressure ring boss (7032) connected with the pressure ring body (7031), the end face of the pressure ring boss (7032) is adapted to abut against one end face of the sealing ring (701), and the end face of the pressure ring body (7031) close to the pressure ring boss (7032) is adapted to abut against the outer circumferential surface of the rod mill barrel (1).
6. Bolt sealing structure of a rod mill barrel according to claim 5, characterized in that the central area of the press ring boss (7032) is formed with a press ring through hole (7033) adapted for the passage of the seal ring mounting part (503) and the threaded connection part (504) of the screw (5).
7. The bolt seal arrangement of a rod mill barrel according to any one of claims 1 to 6, characterized in that the seal ring (701) is a soft rubber seal ring or a polytetrafluoroethylene seal ring.
8. The bolt seal arrangement of a rod mill barrel according to any one of claims 1 to 6, wherein the support ring (702) is formed from hard rubber or tetrafluoroethylene.
9. A rod mill comprising a bolt seal arrangement of a rod mill barrel according to any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111160673.XA CN114060384B (en) | 2021-09-30 | 2021-09-30 | Bolt sealing structure of rod mill barrel and rod mill |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111160673.XA CN114060384B (en) | 2021-09-30 | 2021-09-30 | Bolt sealing structure of rod mill barrel and rod mill |
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| CN114060384A CN114060384A (en) | 2022-02-18 |
| CN114060384B true CN114060384B (en) | 2023-07-21 |
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| CN202111160673.XA Active CN114060384B (en) | 2021-09-30 | 2021-09-30 | Bolt sealing structure of rod mill barrel and rod mill |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115475680B (en) * | 2022-10-12 | 2023-06-02 | 广东磊蒙重型机械制造有限公司 | Wet rod mill sand making machine and use method thereof |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2005100072B4 (en) * | 2004-12-09 | 2005-08-18 | Brian Investments Pty Ltd | Hardened plate fixing system |
| CN203784289U (en) * | 2014-03-31 | 2014-08-20 | 神华集团有限责任公司 | Bolt sealing device for cylinder and coal pulverizer with same |
| CN203926762U (en) * | 2014-07-10 | 2014-11-05 | 宁波市天基隆智控技术有限公司 | A kind of lining plate of coal grinder bolt seal assembly |
| CN106322024B (en) * | 2016-09-23 | 2018-06-01 | 北京国电龙源环保工程有限公司 | A kind of feeding sealing device of wet type ball mill, sealing system and its installation method |
| CN206347107U (en) * | 2016-11-24 | 2017-07-21 | 天津市汇合科技开发有限公司 | A kind of ball mill barrel sealing mechanism |
| CN208764451U (en) * | 2018-08-21 | 2019-04-19 | 上海新罡科技有限公司 | A kind of throttle valve stem sealing structure |
| CN213078644U (en) * | 2020-05-25 | 2021-04-30 | 宁波四明化工有限公司 | Tube bolt packing sealing structure and rod mill applying same |
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