CN114060384A - 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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- CN114060384A CN114060384A CN202111160673.XA CN202111160673A CN114060384A CN 114060384 A CN114060384 A CN 114060384A CN 202111160673 A CN202111160673 A CN 202111160673A CN 114060384 A CN114060384 A CN 114060384A
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- 238000009434 installation Methods 0.000 claims abstract description 28
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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
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- 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
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- 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
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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
- 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
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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
- 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
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- 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
Abstract
The invention relates to a rod mill, and discloses a bolt sealing structure of a rod mill barrel, which comprises a rod mill barrel, a buffer cushion and a lining plate which are sequentially arranged from outside to inside, wherein screw rod installation through holes are formed in the barrel, the buffer cushion and the lining plate, a screw rod is arranged in each screw rod installation through hole, one end, close to the rod mill barrel, of each screw rod is connected with a plurality of fastening nuts, an axial sealing pair is arranged on each screw rod and comprises a plurality of sealing rings, and supporting rings and sealing pressing rings are arranged on two sides of each sealing ring, and each sealing ring is arranged in each installation through hole so that the fastening nuts and the rod mill barrel can be in sealing connection. In addition, the invention also discloses a rod mill. The bolt sealing structure of the rod mill barrel is simple in structure, good in sealing effect and high in 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 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 rotary part, a discharging device, a driving device, a lubricating system, an electric control system and the like. Wherein, the rotary part is the main part core part of rod mill, and comprises parts such as rod mill barrel, business turn over material end cover, welt, and the welt is connected on the rod mill barrel by the bolt, and generally adopts the drum-shaped rubber packing pad to seal between rod mill barrel and the bolt, and its seal structure sketch map is shown in fig. 1: the sealing structure is characterized in that a sealing gasket and a sealing gland are sleeved in a sealing outer sleeve and are fastened through a fastening nut, the sealing gasket is tightly pressed through the sealing gland, the sealing gasket and a rod mill cylinder form end face sealing on the rod mill cylinder, and coal water slurry in the rod mill cylinder is prevented from leaking through bolt holes so as to achieve a sealing effect. However, in the prior art, when the rod mill works, raw material coal, water and additives enter the cylinder body of the rod mill together, the cylinder body of the rod mill provided with the steel rod is rotated under the driving of the main motor, and the coal water slurry is prepared through impact grinding between the rods and the lining plate. Taking a phi 4000 x 6000 specification rod mill as an example, when equipment runs, more than 100 tons of steel rods in a cylinder body of the rod mill roll down from top to bottom to impact a lining plate in the cylinder body of the rod mill, the cylinder body of the rod mill vibrates violently to generate violent impact on a sealing structure, so that the problems of lining plate sliding, bolt deflection, bolt hole deformation and the like are easily caused after a sealing ring is replaced for 1-2 months, finally, a fastening nut is loosened, the pretightening force between the sealing ring and the cylinder body of the rod mill is reduced or even separated, the sealing function is invalid, and the coal water slurry in the cylinder body leaks outwards from the bolt hole of the cylinder body.
The slurry leakage of the rod mill barrel not only wastes a large amount of raw material coal, but also seriously affects the stable operation of the equipment, reduces the service life of the equipment, and simultaneously causes the floating of the coal powder in a workshop after the coal water slurry is dried and solidified, thereby having the risk of flash explosion. After the leaked coal water slurry is air-dried, the leaked coal water slurry needs to be manually cleaned, and the expenditure of labor cost is increased. The barrel of the rod mill needs to be stopped for a short time after leakage occurs, 720 bolt sealing points are arranged on each barrel of the rod mill, the maintenance workload is large, more spare parts are consumed in replacement, and the cost is high. According to the operation specification, the main motor of the rod mill needs to be powered off every time leakage elimination, 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 on and off during maintenance, and serious potential safety hazards exist.
In view of the above, there is a need to provide a bolt sealing structure for a rod mill barrel to solve or overcome the above technical problems.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the bolt sealing structure of the 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 rod mill barrel, blotter and the welt that sets gradually from the extroversion in, 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, being close to of screw rod the one end of rod mill barrel is connected with a plurality of fastening nut, it is vice to be equipped with axial seal on the screw rod, axial seal is vice including a plurality of sealing washers and locate the support ring and the sealed clamping ring of the both sides of sealing washer, each the sealing washer is located in the installation through-hole, so that can make fastening nut with form sealing connection between the rod mill barrel.
Preferably, the screw rod includes screw rod tip, step portion, sealing washer installation department and threaded connection portion in proper order, step portion with be formed with the toper transition face between the sealing washer installation department, the one end medial surface of support ring is formed with the chamfer, the chamfer can be supported and lean on the toper transition face, keeping away from of support ring the one end terminal surface of chamfer is suitable for supporting and leans on the one end terminal surface of sealing washer, wherein, the screw rod tip step portion with the sealing washer installation department is formed with a plurality of perforating holes, each the one end setting of perforating hole is in the terminal surface of screw rod tip, the other end sets up on the global of sealing washer installation department.
Preferably, the screw end portion is formed as a circular truncated cone that is gradually inclined from an outer peripheral edge toward a central axis, an end surface of the screw end portion is formed as a flat surface, and the end surface of the screw end portion is lower than an inner peripheral surface of the packing.
Preferably, the tapered transition surface is formed to be gradually inclined from an end close to the tapered transition surface toward the central axis.
More preferably, the number of the sealing rings is 3-5.
Preferably, sealed clamping ring include the clamping ring body and with the clamping ring boss of this body coupling of clamping ring, the terminal surface of clamping ring boss is suitable for to lean on the one end terminal surface of sealing washer, being close to of clamping ring body the one end terminal surface of clamping ring boss is suitable for to lean on the outer peripheral face of rod mill barrel.
Preferably, a central area of the pressing ring boss is provided with a pressing ring through hole which is suitable for the sealing ring installation part and the threaded connection part of the screw rod to penetrate through.
Preferably, the sealing ring is a soft rubber sealing ring or a polytetrafluoroethylene sealing ring.
Preferably, the support ring is molded from hard rubber or tetrafluoroethylene.
A rod mill comprising a bolt seal arrangement of a rod mill cylinder according to any of the above claims.
According to the technical scheme, the bolt sealing structure of the rod mill barrel comprises the rod mill barrel, a buffer cushion and a lining plate which are sequentially arranged from outside to inside, screw rod installation through holes are formed in the barrel, the buffer cushion and the lining plate, a screw rod is arranged in each screw rod installation through hole, one end, close to the rod mill barrel, of each screw rod is connected with a plurality of fastening nuts, an axial sealing pair is arranged on each screw rod and 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 mounting through hole so that the fastening nuts and the rod mill barrel can be in sealing connection. According to the bolt sealing structure of the barrel of the rod mill, the screw is provided with the axial sealing pair, the axial sealing pair comprises the plurality of sealing rings, the plurality of sealing rings are all arranged in the screw mounting through hole, in the fastening process of the fastening nut, force is applied to the supporting ring and the sealing press ring, the purpose of applying axial pressure to the plurality of sealing rings is achieved, and the purpose of sealing connection between the screw and the barrel of the rod mill is further achieved.
Drawings
FIG. 1 is a schematic structural view of one embodiment of a prior art bolt seal arrangement for a barrel of a rod mill;
FIG. 2 is a schematic structural view of one embodiment of a bolt sealing structure of a rod mill barrel according to the present invention;
FIG. 3 is a schematic structural view of one embodiment of a screw according to the present invention;
FIG. 4 is a schematic structural view of one embodiment of a support ring according to the present invention;
fig. 5 is a schematic structural view of an embodiment of the sealing collar according to the present invention.
Description of the reference numerals
1 barrel 2 buffer pad of rod mill
3 lining plate 4 screw rod mounting through hole
5 screw 501 end
502 stepped portion 503 packing attachment portion
504 threaded connection 505 tapered transition surface
506 through hole 6 fastening nut
7 axial sealing pair 701 sealing ring
702 support ring 7021 chamfer
703 sealing ring 7031 ring body
7032 clamping ring boss 7033 clamping ring through hole
8 sealing jacket and 9 sealing gland
Detailed Description
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as either a fixed connection, a removable connection, or an integral connection; either directly or indirectly through intervening media, either internally or in any combination thereof. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 2, in one aspect, the present invention provides a bolt sealing structure for a rod mill cylinder, including a rod mill cylinder 1, a buffer pad 2 and a lining plate 3, which are sequentially arranged from outside to inside, wherein screw installation through holes 4 are formed in the cylinder 1, the buffer pad 2 and the lining plate 3, a screw 5 is arranged in the screw installation through hole 4, one end of the screw 5, which is close to the rod mill cylinder 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 includes a plurality of sealing rings 701, and a support ring 702 and a sealing press ring 703 which are arranged on both sides of the sealing ring 701, and each sealing ring 701 is arranged in the installation through hole 4, so that the fastening nuts 6 and the rod mill cylinder 1 can be in a sealing connection.
As can be seen from fig. 2, in the bolt sealing structure of the barrel of the rod mill according to the present invention, the fastening nut 6 is provided with the axial sealing pair 7, the plurality of sealing rings 701 of the axial sealing pair 7 are all disposed in the screw mounting through hole 4, the screw 5 penetrates through the screw mounting through hole 4 from one end of the liner plate 3 and is screwed by the plurality of fastening nuts 6, the fastening nut 6 inside abuts against the sealing press ring 703, and the plurality of sealing rings 701 can form an axial seal in the screw mounting through hole 4 after being subjected to an axial pressure, so that a sealing function is achieved by the axial sealing pair 7. Simultaneously, not only can satisfy sealed function with the vice 7 setting of axial seal in screw rod installation through-hole 4, can also play the supporting role to screw rod 5, compare in the bolt seal structure of the rod mill barrel of prior art in figure 1, can prevent effectively that screw rod 5 from rocking by a wide margin at screw rod installation through-hole 4 formation, and then effectively improve the life of sealing washer 701.
In the invention, the end of the sealing ring 701, which is far away from the sealing press ring 703, is provided with the support ring 702, and the support ring 702 not only can support the sealing ring 701, but also can effectively prevent the service life of the sealing ring 701 from being influenced by the loss of the sealing ring 701 from the gap between the screw 5 and the screw mounting through hole 4 after the sealing ring 701 deforms. In addition, the sealing ring 701 is clamped between the support ring 702 and the sealing press 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 sequentially comprises a screw end 501, a step 502, a seal ring mounting part 503 and a threaded connection part 504, a tapered transition surface 505 is formed between the step 502 and the seal ring mounting part 503, a chamfer 7021 is formed on the inner side surface of one end of the support ring 702, the chamfer 7021 can abut against the tapered transition surface 505, and the end surface of one end of the support ring 702 far from the chamfer 7021 is adapted to abut against the end surface of one end of the seal ring 701, wherein
The screw end 501, the step 502, and the seal attachment portion 503 have a plurality of through holes 506 formed therein, and one end of each through hole 506 is provided on an end surface of the screw end 501 and the other end is provided on a circumferential surface of the seal attachment portion 503.
More preferably, the screw end 501 is formed as a circular truncated cone gradually inclined from the outer peripheral edge toward the central axis, the end surface of the screw end 501 is formed as a flat surface, and the end surface of the screw end 501 is lower than the inner peripheral surface of the packing 3.
Further preferably, the tapered transition surface 505 is formed to be gradually inclined from an end near the tapered transition surface 505 toward the central axis.
As shown in fig. 3, 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 thread connecting portion 504, wherein the screw end 501 is formed as a circular truncated cone, the diameter of the screw end 501 gradually decreases from one end far away from the step 502 to one end of the step 502, a gap exists between the step 502 and the screw mounting through hole 4 for facilitating mounting, and due to the existence of the gap, the screw 5 is mounted in the screw mounting through hole 4 and then shakes, thereby affecting the service life and the sealing effect, therefore, the support ring 702, the seal ring 701 and the pressing ring boss 7032 of the seal pressing ring 703 are sleeved on the screw 5, and the outer peripheral surface of the support ring, the seal ring 701 and the pressing ring boss are abutted against the inner peripheral surface of the screw mounting through hole 4, thereby limiting the shake of the screw 5, prolonging the service life and enhancing the sealing effect.
In addition, during the use, a small gap may be formed between the screw 5 and the seal ring 701 after long-term use, mortar in the barrel of the rod mill may be retained between the screw 5 and the seal ring 701 along the gap, friction between the screw 5 and the seal ring 701 may increase during long-term use, and abrasion of the seal ring 701 may be accelerated, so that a plurality of through holes 506 are added to the screw 5, one end of each through hole is provided on the screw end portion 501, preferably, on the end surface of the screw end portion 501, and the other end of each through hole 506 is provided 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 portion 501 abuts, so that the first seal ring 701 can seal the through holes 506. Conceivably, in the use process, if a small amount of mortar leaks through the gap between the screw rod 5 and the lining plate 3, the mortar can seep back into the cylinder body through the through hole 506 under the action of gravity, so that the phenomenon that the mortar is solidified between the bolt 5 and the sealing ring 701 for a long time and causes certain abrasion to the sealing ring 701 and even the bolt 5 is avoided, and the use effect is good.
Of course, the function of the through hole 506 can also be understood as that when a small amount of mortar leaked between the screw 5 and the seal ring 701 is condensed and ground into powder by the screw 5, the powder can be discharged through the through hole 506, and the powder is prevented from being retained between the screw 5 and the seal ring 701 for a long time to damage the seal 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 also be less than 3, or more than 5, depending on the actual installation requirement and the thickness of the sealing rings 701, and all of them belong to the protection scope of the present invention.
As still another preferred embodiment of the present invention, as shown in fig. 5, the sealing press ring 703 includes a press ring main body 7031 and a press ring boss 7032 connected to the press ring main body 7031, an end face of the press ring boss 7032 is adapted to abut against an end face of one end of the seal ring 701, and an end face of the press ring main body 7031 near the press ring boss 7032 is adapted to abut against an outer peripheral surface of the barrel 1 of the rod mill.
More preferably, a pressing ring through hole 7033 adapted to pass the seal ring mounting portion 503 and the threaded connection portion 504 of the screw 5 is formed in a central region of the pressing ring boss 7032.
As a specific structure form of the present invention, the seal ring 701 is a soft rubber seal ring or a teflon seal ring.
More specifically, the support ring 702 is molded from a hard rubber or tetrafluoroethylene.
The invention also provides a rod mill, which comprises the bolt sealing structure of the rod mill cylinder body according to any one of the technical schemes.
The installation process of the bolt sealing structure of the rod mill cylinder body comprises the following steps: firstly, adjusting the position of a lining plate 3 in a barrel 1 of the rod mill, and inserting a screw rod 5 into a screw rod installation through hole 4 from the inner side to ensure that the central line of the screw rod 5 is basically superposed with the central axis of the screw rod installation through hole 4; secondly, the support ring 702, the plurality of seal rings 701 and the seal press ring 703 are sequentially sleeved on the screw rod 5, and the fastening nut 6 is sequentially screwed to ensure that the screw rod 5 has enough pretightening force to fix the lining plate 3. After the bolt sealing structures of the barrel of the rod mill are completely installed, production water is added into the rod mill, the rod mill is tried to operate at a normal rotating speed, a steel rod in the rod mill impacts the lining plate 3, the rod mill is stopped when the rod mill operates for about 1 hour, the screw rod 5 is fastened again, and the normal feeding operation can be realized after the operation.
When the axial sealing pair 7 in the bolt sealing structure of the rod mill cylinder body is found to be failed, the fastening nut 6 is selected, and a new sealing ring 701 is replaced. In the replacement process, the support ring 702 still remains in the screw mounting through hole 4, so that the screw 5 is maintained to a certain extent, 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 important problems:
firstly, the bolt sealing structure of the barrel of the rod mill can effectively ensure that the problems of sliding of the lining plate 3 of the rod mill, deflection of the screw 5 and the like are effectively controlled by arranging the plurality of sealing rings 701 of the axial sealing pair 7, the supporting ring 702 and the pressing ring boss 7032 of the sealing pressing ring 703 in the screw mounting through hole 4 and penetrating the screw 5 from the axial sealing pair 7 in the normal operation process of the rod mill, and can still maintain a good sealing effect in the gradual loosening process of the fastening nut 6, so that the leakage of the coal water slurry of the screw mounting through hole 4 on the barrel of the rod mill can be eliminated.
Secondly, the bolt sealing structure of the barrel of the rod mill can be used for not only reforming the existing rod mill, but also manufacturing and processing new equipment in a manufacturing plant. Meanwhile, the bolt sealing structure of the rod mill cylinder can be applied to sealing structures of rotary mixing equipment with similar structures in other fields, and has wide popularization value.
As a specific embodiment of the present invention, the specific technical solution of the present invention is described as follows:
1. diameter D of screw mounting through hole 4 of rod mill barrel1Thickness B of barrel 1 of rod mill1Diameter D of screw installation through hole 4 on rod mill cylinder with phi 4000 x 6000 as reference1The thickness B of the cylinder 1 of the rod mill is between 38 and 41mm1Is 36-40 mm.
2. The size of the screw 5 is designed: 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 thread root from the joint of the screw end 501 and the stepped part 502 to the thread connecting part 504 is B2The length of the step 502 is 0.3B2The diameter of the stepped portion 502 is designed to be D because there is a diameter gap of about 2mm between the outer peripheral surface of the stepped portion 502 and the screw mounting through-hole 42＝D1And 2, the installation of the lining plate 3 is facilitated, and meanwhile, the limited space for the screw 5 to rock in the screw installation through hole 4 is ensured. The tapered transition surface 505 is a 6 × 30 ° chamfer, the step 502 is transitioned to the seal ring mounting portion 503, the seal ring mounting portion 503 is designed as a polish rod having the same size as the outer diameter of the thread of the threaded connection portion 504, and the diameter of the seal ring mounting portion 503 is designed as D3＝D2-6, the thread gauge of the threaded connection 504 is M (D)3) The length is set to satisfy the thickness of the two fastening nuts 6.
3. The size of the seal ring 701 is designed: the sealing ring 701 mainly plays a role in sealing, a formed soft rubber ring, a formed polytetrafluoroethylene packing ring and the like can be selected, and specifications are selected as follows: phi D45 x 3mm, 3-5 in a group of sealing arrangement.
4. Design of the support ring 702: the support ring 702 is made of hard rubber or non-metallic materials such as polytetrafluoroethylene, has the same specification and size as the seal ring 701, mainly plays a supporting role, and prevents the seal ring 701 from losing from the gap between the screw rod 5 and the screw rod installation through hole 4 after deforming to influence the sealing life.
Wherein D is1Denotes the diameter of the screw mounting through-hole 4, B1Denotes the thickness of the barrel 1 of the rod mill, D2Indicates the diameter of the step 502, B2The length from the connection of the screw end 501 and the step 502 to the thread root of the threaded connection 504, D3The diameter D of the seal ring mounting part 5034The outer diameter of the seal ring 701 is shown according to the diameter D of the screw mounting through-hole 41And then.
After the rod mill normally operates, the rod mill is generally maintained for the first time within two weeks according to the actual operating conditions, and the screw 5 is comprehensively fastened. And subsequently, according to actual conditions, comprehensively fastening the screw 5 every month or every two months, so that the effectiveness of the bolt sealing structure of the barrel of the rod mill is ensured. If leakage occurs in the normal operation process, only the fastening nut 6 and the sealing press ring 703 need to be detached, and a proper amount of the sealing ring 701 is added or the sealing ring 701 is replaced according to the requirements, and the operation is finished after fastening. If the screw 5 is seriously inclined and the sealing ring 701 cannot be added, the position of the lining plate 3 needs to be adjusted, and the support ring 702, the sealing press ring 703, the sealing ring 701, the screw 5 and other parts are replaced according to actual conditions.
Compared with the sealing structure in the prior art, the invention has the following advantages:
first, sealing effectiveness: the sealing structure of the rod mill cylinder has good sealing effect in the normal operation process of the rod mill. As 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 rod 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 amount of the screw 5 is small, and the loosening amount of the fastening nut 6 is mainly considered. Through field test, after the rod mill operates for 3 months, only 3-5 fastening nuts in the 720 remaining sealing structures on the rod mill loosen to cause leakage, and the inspection finds that the leakage is caused by the fact that the fastening nuts 6 loosen too much. Through normal maintenance, the accumulative service life of the sealing structure can reach more than 15 months.
Secondly, the screw 5 is supported by the support ring 702, the sealing ring 701 and the sealing press 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 coal slurry leakage at the mounting through hole of the screw 5 is effectively eliminated, the safety and environmental protection risks caused by coal powder drifting due to the coal slurry leakage are reduced. Meanwhile, the overhaul quantity is reduced, the labor consumption for overhaul 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 by the sealing structure of the rod mill cylinder body are greatly reduced, and the price is basically the same because the screw 5 is only partially adjusted. In the conventional structure shown in fig. 1, a single set of seal price is mainly composed of three parts, namely a seal gland 9, a seal ring 701 and a seal housing 8, and the cumulative cost is about 85+55+ 125-265 yuan. The price of the single sealing structure in the sealing structure of the present invention shown in fig. 2 is mainly the cumulative cost of three pieces of the support ring 702, the sealing ring 701 and the sealing press ring 703 is about 5+2 × 5+50 ═ 65 yuan. The single-group sealing can reduce the original cost of 265-65-200 yuan. Taking a phi 4000 x 6000 specification rod mill as an example, the whole rod mill reduces the cost by about 200 x 720 to 14.4 ten thousand yuan, and has good economic benefit.
Fourth, better popularization: the method for the bolt sealing structure of the rod mill barrel is simple and practical, can be used for on-site reconstruction and construction, is also suitable for manufacturing and processing of new equipment in a manufacturing plant, and can be popularized and used in 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 with reference to the accompanying drawings, however, 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 technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. A bolt sealing structure of a rod mill cylinder is characterized by comprising a rod mill cylinder (1), a cushion pad (2) and a lining plate (3) which are arranged from outside to inside in sequence, the barrel body (1), the buffer pad (2) and the lining plate (3) are provided with screw mounting through holes (4), a screw rod (5) is arranged in the screw rod installation through hole (4), one end of the screw rod (5) close to the barrel body (1) of the rod mill is connected with a plurality of fastening nuts (6), an axial sealing pair (7) is arranged on the screw rod (5), the axial sealing pair (7) comprises a plurality of sealing rings (701), and a support ring (702) and a sealing press ring (703) which are arranged on two sides of the sealing rings (701), each sealing ring (701) is arranged in the installation through hole (4), so that the fastening nut (6) and the rod mill cylinder (1) can be connected in a sealing manner.
2. The bolt sealing structure of the barrel of the rod mill according to claim 1, characterized in that the screw (5) comprises a screw end (501), a step part (502), a seal ring mounting part (503) and a threaded connection part (504) in sequence, a tapered transition surface (505) is formed between the step part (502) and the seal ring mounting part (503), a chamfer (7021) is formed on one end inner side surface of the support ring (702), the chamfer (7021) can abut against the tapered transition surface (505), and one end surface of the support ring (702) far away from the chamfer (7021) is suitable for abutting against one end surface of the seal ring (701), wherein the end surface of the support ring (702) far away from the chamfer (7021) is suitable for abutting against one end surface of the seal ring (701), and the bolt sealing structure is characterized in that
The screw end portion (501), the step portion (502) and the seal ring mounting portion (503) are formed with a plurality of through holes (506), one end of each through hole (506) is arranged on the end face of the screw end portion (501), and the other end is arranged on the circumferential surface of the seal ring mounting portion (503).
3. The bolt sealing structure of a barrel of a rod mill according to claim 2, wherein the screw end portion (501) is formed as a circular truncated cone which is gradually inclined from an outer peripheral edge toward a central axis, an end surface of the screw end portion (501) is formed as a flat surface, and the end surface of the screw end portion (501) is lower than an inner peripheral surface of the liner plate (3).
4. The pin seal structure of a barrel of a rod mill according to claim 2, characterized in that the tapered transition surface (505) is formed to be gradually inclined from an end near the tapered transition surface (505) toward a central axis.
5. A bolt sealing structure of a rod mill cylinder according to claim 1, characterized in that the number of the sealing rings (701) is 3-5.
6. The bolt sealing structure of the rod mill cylinder according to claim 1, characterized in that the sealing press ring (703) comprises a press ring body (7031) and a press ring boss (7032) connected with the press ring body (7031), the end face of the press ring boss (7032) is suitable for abutting against the end face of one end of the sealing ring (701), and the end face of one end of the press ring body (7031) close to the press ring boss (7032) is suitable for abutting against the outer peripheral face of the rod mill cylinder (1).
7. The bolt sealing structure of a rod mill barrel according to claim 6, wherein a central region of the pressing ring boss (7032) is formed with a pressing ring through hole (7033) adapted to pass through a seal ring mounting portion (503) and a threaded connection portion (504) of the screw (5).
8. The screw sealing structure of rod mill cylinder according to any one of claims 1 to 7, characterized in that the sealing ring (701) is a soft rubber sealing ring or a polytetrafluoroethylene sealing ring.
9. A bolt sealing structure of a rod mill cylinder according to any one of claims 1 to 7, characterized in that the support ring (702) is molded with hard rubber or tetrafluoroethylene.
10. A rod mill, characterized by comprising a bolt seal structure of a rod mill cylinder according to any one of claims 1 to 9.
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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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| CN202111160673.XA CN114060384B (en) | 2021-09-30 | 2021-09-30 | Bolt sealing structure of rod mill barrel and rod mill |
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| CN114060384B CN114060384B (en) | 2023-07-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115475680A (en) * | 2022-10-12 | 2022-12-16 | 广东磊蒙重型机械制造有限公司 | Wet rod mill sand making machine and use method thereof |
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|---|---|
| CN114060384B (en) | 2023-07-21 |
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