CN109382196A - Power plant coal machine tie-rod sealing attachment device - Google Patents
Power plant coal machine tie-rod sealing attachment device Download PDFInfo
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- CN109382196A CN109382196A CN201710689084.8A CN201710689084A CN109382196A CN 109382196 A CN109382196 A CN 109382196A CN 201710689084 A CN201710689084 A CN 201710689084A CN 109382196 A CN109382196 A CN 109382196A
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- pull rod
- elastic
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- plate
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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
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
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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
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Gasket Seals (AREA)
Abstract
The invention discloses power plant coal machine tie-rod sealing attachment devices, including the upper sealing mechanism for being mounted on coal pulverizer cabin top and the lower sealing mechanism for being mounted on coal pulverizer cabin lower part, it is structurally characterized in that: the upper sealing mechanism includes being installed in the positioning tube that setting is upwardly extended on cabin, positioning tube is arranged with the pull rod coaxial package being inserted into cabin, positioning tube upper end is connected with upper seal closure by upper elastic locating mechanism, upper seal closure includes the cover cylinder that suit cooperation can be slided up and down with pull rod, it is arranged at intervals with slot from the top down on cover cylinder inner wall, bracket groove, lower slot, upper slot, bracket groove, it is installed with respectively in lower slot and seals the upper copper ring being slidably matched with pull rod outer wall, middle copper ring, lower copper ring.Structurally reasonable, sealing is tight, can with the sliding of pull rod adjust automatically connection sealing, be not easy the coal that leaks out, leaks, installing and dismounting is simple, easy to maintenance, and helps to reduce cost.
Description
Technical field
The present invention relates to power plant coal machine tie-rod sealing attachment devices.
Background technique
Coal pulverizer is by coal crusher and to wear into the machinery of coal dust, it is the important ancillary equipment of coal-powder boiler.According to work
Mode point, there is the models such as vertical pulverizer, high-pressure overhang roll mill, middling speed micropowder grinding, super-pressure trapezoidal mill, Raymond mill；It works by coal-grinding
The revolving speed of component can be divided into three types, i.e. low-speed coal mill, medium-speed pulverizer and high speed coal mill.
What the roller ring mill that Datang Linqing steam power plant now comes into operation designed for Beijing Electrical Equipment Factory
II type coal pulverizer of ZGM95K-, grinding roller loading method are loaded using hydraulic change, are loaded double using floating cone cover and sealing air at pull rod
, has often there is powder leakage phenomenon in resealing at hydraulic loading device tie-rod sealing since putting into operation, be primarily due to coal-grinding through site inspection
The tie-rod sealing of machine manufactory design meets place using rigid seal and pull rod, fully relies on the pressure difference of sealing air and First air to hinder
Coal dust leaks to the outside in only grinding, and is just easy to cause rigid sealing ring when being mingled with the ironwares such as iron wire, discard electrode in coal
Abrasion, seal clearance after increasing a large amount of coal grains leak into the small interior of tie-rod sealing out of mill and led gradually by bad seals under pull rod
Sealing air is caused to leak out outside coal pulverizer from tie-rod sealing cell by sealing under pull rod entrainment of coal dust, due to the leakage of sealing air,
The air quantity of sealing air, pressure start to reduce, and gradually cause to be leak into coal dust in other two tie-rod sealing rooms, accelerate other two
The rate of wear of tie-rod sealing, the leakage of tie-rod sealing not only results in a large amount of coal dusts losses, pulverizer capacity reduces, pull rod
The abrasion of sealing ring, the reduction of sealing air air quantity, pressure, also seriously polluted site environment, cause to have to stop mill maintenance, shadow
The stability of boiler load is rung.Simultaneously because need to often replace rigid sealing ring after powder leakage caused by drag-link, disbursement is big；Coal pulverizer leakage
Powder, load fluctuation failure costs caused by reducing and stopping mill of contributing are larger；Maintenance down expense and environmental cleanup labour cost are not
It is disconnected to increase.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of structurally reasonable, sealing is tight, can be with the sliding of pull rod
And adjust automatically connection sealing, it is not easy the coal that leaks out, leaks, installing and dismounting is simple, and it is easy to maintenance, and help to reduce the hair of cost
Power plant's coal machine tie-rod sealing attachment device.
In order to solve the above technical problems, this power plant coal machine tie-rod sealing attachment device includes being mounted on coal pulverizer cabin
The upper sealing mechanism on top and the lower sealing mechanism for being mounted on coal pulverizer cabin lower part, are structurally characterized in that: the upper sealer
Structure includes being installed in the positioning tube that setting is upwardly extended on cabin, and positioning tube is installed with the pull rod coaxial sleeve being inserted into cabin
It sets, positioning tube upper end is connected with upper seal closure by upper elastic locating mechanism, and upper seal closure includes that can slide up and down set with pull rod
The cover cylinder closed is assembled, is arranged at intervals with slot, bracket groove, lower slot, difference in upper slot, bracket groove, lower slot on cover cylinder inner wall from the top down
It is installed with and seals upper copper ring, middle copper ring, the lower copper ring being slidably matched with pull rod outer wall.
This power plant coal machine with tie-rod sealing attachment device be by can elasticity adjustment triple seal structure come realize knot
Structure is reasonable, and sealing is tight, is not easy the coal that leaks out, leaks, and installing and dismounting is simple, easy to maintenance, and helps to reduce cost.
Can elasticity adjustment triple seal structure mainly include six part-structures, it may be assumed that positioning tube, upper elastic locating mechanism,
Upper seal closure, upper copper ring, middle copper ring, lower copper ring.Wherein, positioning tube is fixed on vertically above cabin, and positioning tube is cylindrical, with
The cooperation of pull rod coaxial package.It positions storehouse internal diameter and is much larger than pull rod diameter, setting in this way can make pull rod that radial Light deformation occur
When keep reliable freedom degree, avoid with the mechanical collision of the other components such as positioning tube or friction, it is suitable to help to improve work
Smooth property and reliability.Meanwhile positioning tube is also the installation carrier of this patent other component, provides support force for other component.It is fixed
Position cylinder exactly makes the connecting portion of this patent and pull rod as far as possible far from the middle part of pull rod and close to tie rod end there are one effect,
It is radially shaken in being moved in this way to avoid pull rod, improves the relative stability of pull rod position in cabin.Positioning tube upper end is logical
It crosses elastic locating mechanism and seal closure is installed, upper seal closure and pull rod outer wall elastic packing cooperate.Upper elastic locating mechanism
Main function be that upper seal closure can be located in positioning tube end and allow upper seal closure with small radial displacement phase
It is mobile to positioning tube, thus play flexibly positioned effect.Flexibly positioned effect is embodied in pull rod with closing, and is exactly
Pull rod guarantees that upper seal closure and pull rod still keep sealing state in certain small radial vibration, ensures that do not leak in this way
Wind does not leak coal.In this patent, upper seal closure is cylindrical, assembles and closes with drag link sleeve.On upper seal closure inner wall from the top down according to
There are three annular grooves for minor tick setting, it may be assumed that goes up slot, bracket groove and lower slot, respectively corresponds and be installed in upper slot, bracket groove and lower slot
Copper ring, middle copper ring and lower copper ring.The outside portion of upper copper ring, middle copper ring and lower copper ring is installed on respectively in slot, bracket groove and lower slot,
Upper seal closure inner wall is all extended in the inside portion of upper copper ring, middle copper ring and lower copper ring, and upper copper ring, middle copper ring and lower copper ring
Internal ring wall is slidably matched with the sealing of pull rod outer wall.In this patent, upper copper ring, middle copper ring and lower copper ring all use copper material, relatively
Not only there is certain elasticity in other materials, ensure that sealing effect, and there is excellent wearability, ensure that work is steady
Qualitative and cost reduction.In this patent, upper copper ring, middle copper ring and lower copper ring three seals ring structure are used, is greatly protected
The sealing effect of upper seal closure and pull rod has been demonstrate,proved, fundamentally prevented to leak out, leaked the drawbacks of coal or powder leakage.This patent structure is set
Meter rationally, when needing demolition and maintenance, only need to open elastic locating mechanism, can separate upper seal closure, Awaiting Parts or whole
Body replacement is all very convenient.
The upper elastic locating mechanism includes the annular groove that cover cylinder lower part is arranged in, annular groove as a preferred implementation manner,
Interior interval is fitted at least three pressing plates, and pressing plate outer end is fixed together by upper bolt and the positioning plate of positioning tube upper end.
In this upper elastic locating mechanism, pressing plate is the bridge for connecting upper seal closure and positioning tube, in the insertion of pressing plate inner end
In the annular groove of seal closure lower part, pressing plate outer end is fixed together by the way that upper bolt is corresponding with the positioning plate of positioning tube upper end.At this
In patent, the quantity of pressing plate is not limited, but at least three, uniform force application can be played in this way positions upper seal closure
Effect.
The pressing plate includes cooperating with the upper plate of annular groove inserting cooperation, with positioning plate as a preferred implementation manner,
Lower plate further includes the middle plate for being fixed together upper plate and lower plate, and a receiving is constituted between upper plate, middle plate and positioning plate
The cavity of cover cylinder lower part.
In this pressing plate, pressing plate is mainly made of three parts structure, i.e. upper plate, middle plate and lower plate.Wherein, upper plate and lower plate
Dislocation is arranged in parallel, and the adjacent portions of the two are fixed together by middle plate, and three cross section is substantially Z-shape.Upper plate and annular groove
Inserting cooperation, lower plate are fixedly mounted on positioning plate by upper bolt, therefore upper seal closure is determined by fixed be pressed in of pressing plate
On the plate of position.For convenience of narration, annular groove lower section and positioning plate are known as base pressure plate, base pressure edges of boards by the upper seal closure part of press-fit
Portion is located in a cavity being made of upper plate, middle plate and positioning plate, and the cavity is bigger than base pressure plate, that is to say, that base pressure plate can
With the transverse shifting in the cavity in stress, namely move radially, ensure that pull rod in radially vibration in this way on seal closure
Also it can move and still can guarantee the sealing reliability of pull rod Yu upper sealing mechanism.
As an improvement, positioning plate top surface is equipped with top surface slot, it is provided in the slot of top surface and cooperates with cover cylinder bottom surface elastic packing
Sealing ring.
Top surface slot is set on positioning plate top surface, and sealing ring is set in the slot of top surface, positioning plate and base pressure plate can be made
It is still able to maintain elastic packing cooperation when pull rod radially shakes, further ensures the sealing stability of this patent.
As an improvement, the lower sealing mechanism includes the lower cylinder for being mounted on cabin lower part and the cooperation of pull rod coaxial package, under
Cylinder upper port is installed with the upper cylinder plate closed with drag link sleeve assembly, and lower cylinder lower end oral area is connected with outwardly extending lower cylinder plate, lower cylinder
Hush panel is fixedly installed with by lower bolt on plate, the sealing closed with drag link sleeve assembly is equipped in the middle part of hush panel, is passed through in lower cylinder
Interior positioning mechanism, which is equipped with, makes lower cylinder and pull rod elasticity squeeze the elastic ring body of sealing cooperation.
This lower sealing mechanism is to be realized by squash type inner seal structure structurally reasonable, and sealing is tight, can be with drawing
The sliding of bar and adjust automatically connection sealing, are not easy the coal that leaks out, leaks, and installing and dismounting is simple, easy to maintenance, and help to reduce
Cost.
Squash type inner seal structure mainly includes four part-structures, it may be assumed that lower cylinder, upper cylinder plate, lower cylinder plate, elastic ring body.Its
In, lower cylinder is the housing parts of lower sealing mechanism and the installation carrier of other component.Lower cylinder is circular tube shaped, coaxial with pull rod
Suit cooperation, is equipped with toroidal cavity between lower cylinder inner wall and pull rod outer wall.Lower cylinder upper end is connected with cylinder plate, sets in the middle part of upper cylinder plate
There is the hole closed with drag link sleeve assembly, upper cylinder plate and pull rod are clearance fit, therefore pull rod can pass freely through cylinder plate.Under lower cylinder
There are hush panel, hush panel and corresponding lower cylinder plate in end by being equipped with lower cylinder plate horizontal-extending outward, lower cylinder plate bottom snap
Peripheral ring is equipped with several lower bolts, and the two passes through lower bolt fixed seal connection.Hush panel central part is equipped with the envelope of suit pull rod
Mouthful, sealing diameter is much larger than pull rod outer diameter, in order to which pull rod is slightly radially swung.In this way, upper cylinder plate, lower cylinder, hush panel are just enclosed
It has been coiled into the inner cavity of lower cylinder.In this patent, an elastic ring body, elastic ring are equipped with by interior positioning mechanism in lower tube inner chamber
Internal wall and the assembly of pull rod outer wall elastic seal cartridge are closed, and elastic ring body outer wall and lower tube inner chamber wall elastic packing cooperate.Work as pull rod
When axial movement, elastic ring body can be realized to synchronize by flexible deformation and be followed, can pull rod has slight radial vibration
It is absorbed by elastic ring body, therefore ensure that lower sealing mechanism neither leaks out nor leak coal or powder leakage.
As a kind of implementation, the interior positioning mechanism include be installed on cylinder plate inner wall with pull rod gap package
The upper cylinder ring of cooperation, upper cylinder ring cross section is presented triangle sharp under width, is installed on hush panel inner wall and pull rod gap package
The lower cylinder ring of cooperation, lower cylinder ring cross section are in the triangle of lower wide upper point, are respectively equipped in the elastic ring body upper and lower end faces
With the upper cylinder slot and lower cylinder slot of upper cylinder ring and the lower clamped cooperation of cylinder ring, annular chamber between elastic ring body lateral wall and lower cylinder inner wall
If being inside evenly equipped with the spring that capable person's elastic ring body inner wall is expressed on pull rod.
As an improvement, elastic ring body top is equipped with two elastic arms corresponding with upper cylinder ring two sidewalls, i.e., interior upper elastic arm
With outside upper elastic arm, interior upper elastic arm together with the elastic fit of pull rod top, paste by outside upper elastic arm and lower tube inner chamber wall lower part
It is combined；Elastic ring body lower part is equipped with two elastic arms corresponding with lower cylinder ring two sidewalls, i.e., interior lower elastic arm and outer lower bullet
Property arm, interior lower elastic arm fit together with pull rod lower elastic, and outer lower elastic arm fits together with lower tube inner chamber wall lower part.
Positioning mechanism mainly includes five part-structures in this, it may be assumed that upper cylinder ring, upper cylinder slot, lower cylinder ring, lower cylinder slot and spring.
Wherein, upper cylinder ring is installed on cylinder plate inner wall, is in circular ring shape, is cooperated with pull rod gap package, width is presented in upper cylinder ring cross section
The triangle of lower point.For convenience of narration, three sides for constituting above-mentioned triangle are referred to as the top affixed with upper cylinder plate inner wall
Side or roof close on the interior bevel edge or interior skew wall of setting with pull rod, and the outer bevel edge of lower medial wall of the tube setting is closed on far from pull rod
Or outer skew wall.It obviously, should the slot of falling v-shaped as soon as skew wall constitutes the cavity groove of falling v-shaped wide under a upper point in pull rod outer wall and lower cylinder ring
It is one of the key structure of this patent.Lower cylinder ring is fixed on hush panel inner wall, and lower cylinder ring is also in circular ring shape, is covered with pull rod gap
Assembly is closed, and lower cylinder ring cross section is in the triangle of lower wide upper point.For convenience of narration, three sides for constituting above-mentioned triangle are distinguished
The referred to as bottom edge affixed with hush panel inner wall or bottom wall close on the interior bevel edge or interior skew wall of setting with pull rod, face far from pull rod
The outer bevel edge or outer skew wall of nearly lower medial wall of the tube setting.Obviously, skew wall constitutes a cross section in pull rod outer wall and lower cylinder ring
V-shaped cavity groove sharp under width is presented, which is also one of key structure of this patent.The elastic ring body, which is one, has bullet
The entity of property can be made in practical applications of silica gel material.In order to guarantee elastic packing effect, elastic ring body design
Must be more slightly larger than physical location space, such elastic ring body is exactly to be extruded to be installed into lower tube inner chamber.The benefit installed in this way
It is to guarantee that elastic ring body and adjacent each component are all elastic expansion face contacts, considerably increases leakproofness.The upper cylinder slot and
Lower cylinder slot is separately positioned in elastic ring body upper and lower end faces.Upper cylinder slot is under upper width in the cross section of fastening corresponding with upper cylinder ring
The ring-type of sharp triangle, therefore two elastic arms for being divided formation by upper cylinder slot on elastic ring body top, i.e., it is elastic with pull rod
The interior upper elastic arm of fitting and the outside upper elastic arm being bonded with lower tube inner chamber wall.Similar, lower cylinder slot is buckled in corresponding with lower cylinder ring
The cross section of conjunction is the ring-type of wide triangle under upper point, therefore will form two bullets divided by lower cylinder slot in elastic ring body lower part
Property arm, i.e., with elastic arm lower in pull rod elastic fit and the outer lower elastic arm being bonded with lower tube inner chamber wall.Therefore, elastic ring body
Cross section be substantially in the more thick and solid X-shaped in middle part.The purpose being arranged in this way, first is that increasing the surface area of elastic ring body, also
The contact area for increasing elastic ring body and lower tube inner chamber wall, further improves the effect of prevent from leaking out, leak coal or powder leakage.Two
It can play the role of to elastic ring body relative positioning.Most important effect is that, when pull rod axial movement, elastic ring body can lead to
The mobile sealing reliability to guarantee elastic ring body and pull rod of corresponding automatic elastic of upper elastic arm, interior lower elastic arm in crossing.In detail
For thin, when pull rod moves down, air, coal dust in traditional cabin are most likely under pull rod drives the avris outside pull rod
It leaks out.But in this patent, because elastic ring body is to squeeze to be mounted on lower tube inner chamber, when pull rod glides, interior upper bullet
Property arm be to weaken the expansion elastic force of pull rod outer wall and interior skew wall without from the cavity groove of falling v-shaped from slippage, more will not be because of two
Person separates the gap to form air or coal dust leakage.At this point, interior lower elastic arm automatic under pull rod drive can wriggle downwards, and interior
Lower elastic arm can enter the upper wide v-shaped cavity groove depths of lower point being made of skew wall in pull rod outer wall and lower cylinder ring and start to accumulate.
With the downslide of pull rod, interior lower elastic arm can be extruded in above-mentioned v-shaped cavity groove, while to v-shaped cavity groove two sidewalls, that is, pull rod
Skew wall forms bigger extruding force in lateral wall and lower cylinder ring, and which enhances close between elastic ring body, pull rod and lower cylinder
Feng Xing has further prevented to leak out, has leaked coal or powder leakage problem.Likewise, when pull rod upward sliding, interior lower elastic arm and v-shaped
Since the expansion elastic force of cavity groove can weaken but full of entire v-shaped cavity groove less as forming the gap of coal of leaking out, leak, and interior upper bullet
Property arm can enhance the leakproofness between elastic ring body, pull rod and lower cylinder, and guarantee will not leak out, leak coal or powder leakage.In conclusion this
Patent design main points be can with sliding up and down for pull rod adjust automatically sealing emphasis, fundamentally prevented to leak out,
A possibility that leaking coal or powder leakage.In this patent, several springs are also equipped in lower tube inner chamber, outside spring inner end and elastic ring body
Sidewall elastomer presses press-fit, and outer spring end and lower cylinder inner wall elasticity press press-fit, and elastic ring body inner wall is expressed to by above-mentioned spring
On pull rod, the sealed connection performance of pull rod and elastic ring body is further enhanced.
As an improvement, being fixedly installed with the rubber ring closed with the assembly of pull rod elastic seal cartridge in sealing.
It is fixedly mounted in sealing with after the rubber ring of pull rod coaxial package cooperation, rubber ring inner ring can be with pull rod outer wall elasticity
Sealing shroud assembly is closed, and can not only prevent inner air and coal dust from revealing in this way, external sundries can also be stopped to enter lower tube inner chamber,
The reliability service of this patent is greatly ensured.
As a further improvement, hush panel edge is equipped with ring groove corresponding with lower cylinder plate, silicon is installed in ring groove
Rubber ring.
In the ring groove of the setting of hush panel edge and pull rod coaxial arrangement, falope ring can be installed in ring groove, in this way
After lower bolt fastening, falope ring is just compressed in the convergence part of hush panel and lower cylinder plate, ensure that the sealing of the two connection
Property, helping to improve this patent prevents from leaking out, leak the ability of coal or powder leakage.
As a further improvement, being equipped with two column cavity loops being coaxially disposed with elastic ring body, two column cavitys in elastic ring body
Ring setting symmetrical above and below, upper elastic arm and the interior lower elastic arm arrangement respectively inwards in the middle part of elastic ring body lateral wall of two column cavity loops
Setting, and the aperture of cavity loop on the outside of the elastic ring body to inward side to becoming larger.
Cavity loop is the toroidal cavity being arranged in elastic ring body with elastic ring body coaxial arrangement, circular in cross-section, circle
Shape setting can guarantee stress more evenly, be not easily broken after being squeezed.Cavity loop is set in elastic ring body, primarily to
Increase flexible deformation and pliability when being squeezed, the compactness and leakproofness of enhancing and pull rod and lower cylinder inner wall especially exist
When pull rod slides up and down, more easily-deformable interior upper elastic arm and interior lower elastic arm can be easier to be fitted tightly over one with pull rod
It rises, ensure that the gluing, sealing of the two, effectively prevent leaking out and powder leakage phenomenon.
In conclusion the power plant coal machine using this structure is structurally reasonable with tie-rod sealing attachment device, sealing is tight,
Can with the sliding of pull rod adjust automatically connection sealing, be not easy the coal that leaks out, leaks, installing and dismounting is simple, easy to maintenance, and
Help to reduce cost.
Detailed description of the invention
In conjunction with attached drawing, invention is further described in detail:
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the fit structure schematic diagram of the present invention with pull rod；
Fig. 3 is the structural schematic diagram of upper sealing mechanism；
Fig. 4 is the structural schematic diagram of pressing plate；
Fig. 5 is the structural schematic diagram of lower sealing mechanism；
Half section structure diagram when Fig. 6 is elastic ring body nature；
Fig. 7 is that elastic ring body is squeezed and mounted to the half section structure diagram in lower cylinder.
Specific embodiment
As shown in Figure 1, the power plant coal machine tie-rod sealing attachment device includes be mounted on 1 top of coal pulverizer cabin upper
Sealing mechanism 2 and the lower sealing mechanism 3 for being mounted on coal pulverizer cabin lower part, the upper sealing mechanism include be installed on cabin to
Upper extended positioning tube 4, positioning tube are arranged with 5 coaxial package of pull rod being inserted into cabin, and positioning tube upper end passes through upper
Elastic locating mechanism 6 is connected with seal closure 7, and upper seal closure includes the cover cylinder 8 that suit cooperation can be slided up and down with pull rod, cover cylinder
It is arranged at intervals with slot 9, bracket groove 10, lower slot 11 on inner wall from the top down, upper slot, bracket groove are installed in lower slot and pull rod respectively
Outer wall seals upper copper ring 12, middle copper ring 13, the lower copper ring 14 being slidably matched.This power plant coal machine is with tie-rod sealing attachment device master
It to include six part-structures, it may be assumed that positioning tube, upper elastic locating mechanism, upper seal closure, upper copper ring, middle copper ring, lower copper ring.Wherein,
Positioning tube is fixed on vertically above cabin, and positioning tube is cylindrical, is cooperated with pull rod coaxial package.Storehouse internal diameter is positioned much larger than drawing
Shank diameter, in this way setting can make pull rod keep reliable freedom degree when radial Light deformation occurs, avoid with positioning tube etc.
The mechanical collision of other component or friction help to improve work smoothness and reliability.Meanwhile positioning tube be also this patent its
The installation carrier of his component, provides support force for other component.Positioning tube exactly makes this patent and pull rod there are one effect
Connecting portion far from radially shaking in the middle part of pull rod and close to tie rod end, can moving in this way to avoid pull rod, is improved and is drawn as far as possible
The relative stability of bar position in cabin.Positioning tube upper end is equipped with upper seal closure, upper sealing by upper elastic locating mechanism
Cover cooperates with pull rod outer wall elastic packing.
The main function of upper elastic locating mechanism is that upper seal closure can be located in positioning tube end and allowed upper close
Sealing cover is mobile with small radial displacement relative positioning cylinder, thus plays flexibly positioned effect.Flexibly positioned acting body
It is exactly that pull rod guarantees that upper seal closure still keeps sealing with pull rod in certain small radial vibration now with pull rod with closing
State ensures that do not leak out in this way, do not leak coal.In this patent, upper seal closure is cylindrical, assembles and closes with drag link sleeve.On
Three annular grooves are sequentially arranged at intervals on seal closure inner wall from the top down, it may be assumed that upper slot, bracket groove and lower slot, upper slot, bracket groove and
It is respectively corresponded in lower slot and is installed with copper ring, middle copper ring and lower copper ring.Block respectively the outside portion of upper copper ring, middle copper ring and lower copper ring
In upper slot, bracket groove and lower slot, upper seal closure inner wall is all extended in the inside portion of upper copper ring, middle copper ring and lower copper ring, and
Upper copper ring, the internal ring wall of middle copper ring and lower copper ring and the sealing of pull rod outer wall are slidably matched.In this patent, upper copper ring, middle copper ring
Copper material is all used with lower copper ring, not only there is certain elasticity relative to other materials, ensure that sealing effect, and have excellent
Good wearability ensure that the reduction of job stability and cost.In this patent, upper copper ring, middle copper ring and lower copper are used
Ring three seals ring structure, greatly ensure that the sealing effect of seal closure and pull rod, fundamentally prevented to leak out, leak coal or
The drawbacks of powder leakage.This patent is reasonable in design, when needing demolition and maintenance, only need to open elastic locating mechanism, can will be upper
Seal closure separation, Awaiting Parts or integral replacing are all very convenient.
In this patent, the upper elastic locating mechanism includes the annular groove 15 that cover cylinder lower part is arranged in, and interval is inserted in annular groove
Equipped at least three pressing plates 16, pressing plate outer end is fixed together by upper bolt 17 and the positioning plate 18 of positioning tube upper end.At this
In upper elastic locating mechanism, pressing plate is the bridge for connecting upper seal closure and positioning tube, and pressing plate inner end is embedded in upper seal closure lower part
In annular groove, pressing plate outer end is fixed together by the way that upper bolt is corresponding with the positioning plate of positioning tube upper end.In this patent, pressing plate
Quantity does not limit, but at least three, uniform force application can be played the role of in this way and position upper seal closure.
In the present embodiment, the pressing plate includes the lower plate 20 with the upper plate 19 of annular groove inserting cooperation and positioning plate cooperation,
Further include the middle plate 21 for being fixed together upper plate and lower plate, a housing is constituted between upper plate, middle plate and positioning plate
The cavity 22 of cylinder lower part.In this pressing plate, pressing plate is mainly made of three parts structure, i.e. upper plate, middle plate and lower plate.Wherein, on
Plate and lower plate dislocation are arranged in parallel, and the adjacent portions of the two are fixed together by middle plate, and three cross section is substantially Z-shape.On
Plate and annular groove inserting cooperate, and lower plate is fixedly mounted on positioning plate by upper bolt, therefore upper seal closure is fixed by pressing plate
It has been pressed on positioning plate.For convenience of narration, annular groove lower section and positioning plate are known as base pressure plate by the upper seal closure part of press-fit,
Base pressure edges of boards portion is located in a cavity being made of upper plate, middle plate and positioning plate, and the cavity is bigger than base pressure plate, that is to say, that
Base pressure plate can in stress transverse shifting in the cavity, namely move radially, ensure that pull rod in radially vibration in this way
Upper seal closure also can move and still can guarantee the sealing reliability of pull rod Yu upper sealing mechanism.
In this patent, positioning plate top surface is equipped with top surface slot 23, is provided with and cover cylinder bottom surface elastic packing in the slot of top surface
The sealing ring 24 of cooperation.Top surface slot is set on positioning plate top surface, and sealing ring is set in the slot of top surface, can make positioning plate and
Base pressure plate is still able to maintain elastic packing cooperation when pull rod radially shakes, and further ensures the sealing stability of this patent.
In the present embodiment, the lower sealing mechanism includes the lower cylinder for being mounted on cabin lower part and the cooperation of pull rod coaxial package
01, lower cylinder upper port is installed with the upper cylinder plate 08 closed with drag link sleeve assembly, and lower cylinder lower end oral area is connected with outwardly extending lower cylinder
Plate 02 is fixedly installed with hush panel 04 by lower bolt 03 on lower cylinder plate, the envelope closed with drag link sleeve assembly is equipped in the middle part of hush panel
Mouth 05, interior is equipped with by interior positioning mechanism 06 of lower cylinder make lower cylinder and pull rod elasticity squeeze the elastic ring body 07 that sealing cooperates.This
Power plant coal machine tie-rod sealing attachment device mainly includes four part-structures, it may be assumed that lower cylinder, upper cylinder plate, lower cylinder plate, elastic ring
Body.Wherein, lower cylinder is the housing parts of lower sealing mechanism and the installation carrier of other component.Lower cylinder is circular tube shaped, with pull rod
Coaxial package cooperation, is equipped with toroidal cavity between lower cylinder inner wall and pull rod outer wall.Lower cylinder upper end is connected with cylinder plate, in upper cylinder plate
Portion is equipped with the hole closed with drag link sleeve assembly, and upper cylinder plate and pull rod are clearance fit, therefore pull rod can pass freely through cylinder plate.Under
Cylinder lower end, which passes through, is equipped with lower cylinder plate horizontal-extending outward, and lower cylinder plate bottom snap has a hush panel, hush panel and it is corresponding under
Cylinder plate peripheral ring is equipped with several lower bolts, and the two passes through lower bolt fixed seal connection.Hush panel central part is equipped with suit pull rod
Sealing, sealing diameter be much larger than pull rod outer diameter, in order to which pull rod is slightly radially swung.In this way, upper cylinder plate, lower cylinder, hush panel
Just it has been surrounded by the inner cavity of lower cylinder.In this patent, an elastic ring body, bullet are equipped with by interior positioning mechanism in lower tube inner chamber
Property inner wall of ring body and the assembly of pull rod outer wall elastic seal cartridge close, elastic ring body outer wall and lower tube inner chamber wall elastic packing cooperate.When
When pull rod moves axially, elastic ring body can be realized to synchronize by flexible deformation and be followed, even if pull rod has slight radial vibration
Also it can be absorbed by elastic ring body, therefore ensure that lower sealing mechanism neither leaks out nor leak coal or powder leakage.
In the present embodiment, the interior positioning mechanism includes being installed in cooperating on cylinder plate inner wall with pull rod gap package
Upper cylinder ring 09, upper cylinder ring cross section presents triangle sharp under width, is installed on hush panel inner wall and matches with pull rod gap package
The lower cylinder ring 010 closed, lower cylinder ring cross section are in the triangle of lower wide upper point, are respectively equipped in the elastic ring body upper and lower end faces
With the upper cylinder slot 011 and lower cylinder slot 012 of upper cylinder ring and the lower clamped cooperation of cylinder ring, between elastic ring body lateral wall and lower cylinder inner wall
If being evenly equipped with the spring 013 that capable person's elastic ring body inner wall is expressed on pull rod in annular chamber.Elastic ring body top is equipped with and upper cylinder
Corresponding two elastic arms in 09 two sidewalls of ring, i.e., in upper elastic arm 018 and outside upper elastic arm 019, on interior upper elastic arm and pull rod
Together, outside upper elastic arm fits together portion's elastic fit with lower tube inner chamber wall lower part；Elastic ring body lower part is equipped with and lower cylinder
Corresponding two elastic arms in 010 two sidewalls of ring, i.e., in lower elastic arm 020 and outer lower elastic arm 021, under interior lower elastic arm and pull rod
Together, outer lower elastic arm fits together portion's elastic fit with lower tube inner chamber wall lower part.
Positioning mechanism mainly includes five part-structures in this, it may be assumed that upper cylinder ring, upper cylinder slot, lower cylinder ring, lower cylinder slot and spring.
Wherein, upper cylinder ring is installed on cylinder plate inner wall, is in circular ring shape, is cooperated with pull rod gap package, width is presented in upper cylinder ring cross section
The triangle of lower point.For convenience of narration, three sides for constituting above-mentioned triangle are referred to as the top affixed with upper cylinder plate inner wall
Side or roof close on the interior bevel edge or interior skew wall of setting with pull rod, and the outer bevel edge of lower medial wall of the tube setting is closed on far from pull rod
Or outer skew wall.It obviously, should the slot of falling v-shaped as soon as skew wall constitutes the cavity groove of falling v-shaped wide under a upper point in pull rod outer wall and lower cylinder ring
It is one of the key structure of this patent.Lower cylinder ring is fixed on hush panel inner wall, and lower cylinder ring is also in circular ring shape, is covered with pull rod gap
Assembly is closed, and lower cylinder ring cross section is in the triangle of lower wide upper point.For convenience of narration, three sides for constituting above-mentioned triangle are distinguished
The referred to as bottom edge affixed with hush panel inner wall or bottom wall close on the interior bevel edge or interior skew wall of setting with pull rod, face far from pull rod
The outer bevel edge or outer skew wall of nearly lower medial wall of the tube setting.Obviously, skew wall constitutes a cross section in pull rod outer wall and lower cylinder ring
V-shaped cavity groove sharp under width is presented, which is also one of key structure of this patent.
The elastic ring body is that a flexible entity can be made in practical applications of silica gel material.For
Guarantee elastic packing effect, elastic ring body are designed more slightly larger than physical location space, and such elastic ring body is exactly to be extruded
It is installed into lower tube inner chamber.The benefit installed in this way is to guarantee that elastic ring body and adjacent each component are all elastic expansions by crimping
Touching, considerably increases leakproofness.The upper cylinder slot and lower cylinder slot are separately positioned in elastic ring body upper and lower end faces.Upper cylinder slot is in
The cross section of fastening corresponding with upper cylinder ring is the ring-type of upper wide lower sharp triangle, therefore will be formed on elastic ring body top by upper cylinder
Two elastic arms of slot segmentation, i.e., with elastic arm upper in pull rod elastic fit and the outside upper elasticity being bonded with lower tube inner chamber wall
Arm.Similar, lower cylinder slot is the ring-type of wide triangle under upper point in the cross section of fastening corresponding with lower cylinder ring, therefore in elastic ring
Two elastic arms divide by lower cylinder slot will be formed at body lower part, i.e., in pull rod elastic fit times elastic arm and with lower tube inner chamber
The outer lower elastic arm of wall fitting.Therefore, the cross section of elastic ring body is substantially in the more thick and solid X-shaped in middle part.The mesh being arranged in this way
, first is that increasing the surface area of elastic ring body, also just increases the contact area of elastic ring body and lower tube inner chamber wall, further promoted
Prevent from leaking out, leak the effect of coal or powder leakage.Two can play the role of to elastic ring body relative positioning.Most important effect
It is that, when pull rod axial movement, elastic ring body can be protected by the movement of the corresponding automatic elastic of interior upper elastic arm, interior lower elastic arm
Demonstrate,prove the sealing reliability of elastic ring body and pull rod.Specifically, air, coal dust when pull rod moves down, in traditional cabin
It is most likely under pull rod drives to go out from side leakage outside pull rod.But in this patent, because elastic ring body is to squeeze to be mounted on
Lower tube inner chamber, so when pull rod glides, interior upper elastic arm be to the expansion elastic force of pull rod outer wall and interior skew wall weaken without
The gap to form air or coal dust leakage can will not be more separated because of the two from the cavity groove of falling v-shaped from slippage.At this point, interior lower elasticity
Arm automatic under pull rod drive can wriggle downwards, and interior lower elastic arm can enter and be made of skew wall in pull rod outer wall and lower cylinder ring
Lower sharp wide v-shaped cavity groove depths simultaneously starts to accumulate.With the downslide of pull rod, interior lower elastic arm can be extruded in above-mentioned v-shaped cavity groove
It is interior, while bigger extruding force is formed to skew wall in v-shaped cavity groove two sidewalls, that is, pull rod lateral wall and lower cylinder ring, thus
The leakproofness between elastic ring body, pull rod and lower cylinder is enhanced, further prevented to leak out, leaked coal or powder leakage problem.Likewise,
When pull rod upward sliding, since interior lower elastic arm and the expansion elastic force of v-shaped cavity groove can weaken but be full of entire v-shaped cavity groove less
As for the gap for forming the coal that leaks out, leaks, and interior upper elastic arm can enhance the leakproofness between elastic ring body, pull rod and lower cylinder, protect
Card will not leak out, leak coal or powder leakage.In conclusion i.e. be can be automatic with sliding up and down for pull rod for this patent designing points
Adjustment sealing emphasis, has fundamentally prevented to leak out, has leaked a possibility that coal or powder leakage.In this patent, also pacify in lower tube inner chamber
Equipped with several springs, spring inner end and elastic ring body lateral wall elasticity press press-fit, outer spring end and the pressing of lower cylinder inner wall elasticity
Elastic ring body inner wall is expressed on pull rod by cooperation, above-mentioned spring, further enhances the sealed connection of pull rod and elastic ring body
Performance.
In this patent, the rubber ring 014 closed with the assembly of pull rod elastic seal cartridge is fixedly installed in sealing.It is solid in sealing
Dingan County's dress is with after the rubber ring of pull rod coaxial package cooperation, and rubber ring inner ring can be assembled with pull rod outer wall elastic seal cartridge and be closed, in this way
It can not only prevent inner air and coal dust from revealing, can also stop external sundries to enter lower tube inner chamber, greatly ensure this patent
Reliability service.
In the present embodiment, hush panel edge is equipped with ring groove 015 corresponding with lower cylinder plate, is equipped with silicon in ring groove
Rubber ring 016.In the ring groove of the setting of hush panel edge and pull rod coaxial arrangement, falope ring can be installed in ring groove, in this way
After lower bolt fastening, falope ring is just compressed in the convergence part of hush panel and lower cylinder plate, ensure that the sealing of the two connection
Property, helping to improve this patent prevents from leaking out, leak the ability of coal or powder leakage.
In this patent, two column cavity loops 017 being coaxially disposed with elastic ring body, two column cavity loops are equipped in elastic ring body
Setting symmetrical above and below, upper elastic arm and interior lower elastic arm arrangement are set two column cavity loops respectively inwards in the middle part of elastic ring body lateral wall
Set, and the aperture of cavity loop on the outside of the elastic ring body to inward side to becoming larger.Cavity loop be arranged in elastic ring body with
The toroidal cavity of elastic ring body coaxial arrangement, circular in cross-section, circle setting can guarantee stress more evenly, after being squeezed not
It is easily rupturable.Cavity loop is set in elastic ring body, primarily to increase flexible deformation and pliability when being squeezed, enhancing
With the compactness and leakproofness of pull rod and lower cylinder inner wall, especially when pull rod slides up and down, more easily-deformable interior upper elastic arm
Together with interior lower elastic arm can be easier to fit closely with pull rod, the gluing, sealing that both ensure that effectively prevent leaking
Wind and powder leakage phenomenon.
In this patent, for the innovation structure for this patent of giving prominence to the key points, convenient for narration and understand, be omitted in the accompanying drawings
Cabin internal structure and pull rod are located at the structure of cabin and pull rod both ends, and above structure is also not the innovative point institute of this patent
Above structure belongs to well-known technique, not described in detail herein.
Claims (10)
1. a kind of power plant coal machine tie-rod sealing attachment device, the upper sealer including being mounted on coal pulverizer cabin (1) top
Structure (2) and the lower sealing mechanism (3) for being mounted on coal pulverizer cabin (1) lower part, it is characterized in that: the upper sealing mechanism (2) includes
It is installed in the positioning tube (4) that setting is upwardly extended on cabin (1), positioning tube (4) and the pull rod (5) being inserted into cabin (2) are same
Axle sleeve installing is set, and positioning tube (4) upper end is connected with upper seal closure (7) by upper elastic locating mechanism (6), upper seal closure (7) packet
The cover cylinder (8) that can slide up and down suit cooperation with pull rod (5) is included, is arranged at intervals with slot from the top down on cover cylinder (8) inner wall
(9), bracket groove (10), lower slot (11), upper slot (9), bracket groove (10), interior be installed with respectively of lower slot (11) seal with pull rod (5) outer wall
Upper copper ring (12), middle copper ring (13), the lower copper ring (14) being slidably matched.
2. power plant coal machine tie-rod sealing attachment device as described in claim 1, it is characterized in that: the upper elastic positioning machine
Structure (6) includes annular groove (15) of the setting in cover cylinder (8) lower part, and interval is fitted at least three pressing plates (16) in annular groove (15), is pressed
Plate (16) outer end is fixed together by upper bolt (17) and the positioning plate (18) of positioning tube (4) upper end.
3. power plant coal machine tie-rod sealing attachment device as claimed in claim 2, it is characterized in that: the pressing plate (16) includes
With annular groove (15) inserting cooperation upper plate (19), with positioning plate (18) cooperation lower plate (20), further include by upper plate (19) and under
The middle plate (21) that plate (20) is fixed together constitutes a receiving between upper plate (19), middle plate (21) and positioning plate (18)
The cavity (22) of cover cylinder (8) lower part.
4. power plant coal machine tie-rod sealing attachment device as claimed in claim 3, it is characterized in that: on positioning plate (18) top surface
Equipped with top surface slot (23), the sealing ring (24) with the cooperation of cover cylinder (8) bottom surface elastic packing is provided in top surface slot (23).
5. the power plant coal machine tie-rod sealing attachment device as described in claim 1-4 any claim, it is characterized in that: institute
Stating lower sealing mechanism (3) includes the lower cylinder (01) for being mounted on cabin (1) lower part and the cooperation of pull rod (5) coaxial package, lower cylinder (01)
Upper port be installed with pull rod (5) suit cooperation upper cylinder plate (08), lower cylinder (01) lower end oral area be connected with it is outwardly extending under
Cylinder plate (02) is fixedly installed with hush panel (04) on lower cylinder plate (02) by lower bolt (03), be equipped in the middle part of hush panel (04) with
The sealing (05) of pull rod (5) suit cooperation, interior be equipped with by interior positioning mechanism (06) of lower cylinder (01) make lower cylinder (01) and pull rod
(5) elasticity squeezes the elastic ring body (07) of sealing cooperation.
6. power plant coal machine tie-rod sealing attachment device as claimed in claim 5, it is characterized in that: the interior positioning mechanism
It (06) include the upper cylinder ring (09) with the cooperation of pull rod (5) gap package being installed on cylinder plate (08) inner wall, upper cylinder ring (09)
Triangle sharp under width is presented in cross section, and the lower cylinder ring with the cooperation of pull rod (5) gap package is installed on hush panel (04) inner wall
(010), lower cylinder ring (010) cross section is in the triangle of lower wide upper point, is set respectively in elastic ring body (07) upper and lower end faces
There are upper cylinder slot (011) and the lower cylinder slot (012) with upper cylinder ring (09) and the clamped cooperation of lower cylinder ring (010), elastic ring body (07) is outside
Side wall and lower cylinder (01) are expressed on pull rod (5) if being evenly equipped with capable person's elastic ring body (07) inner wall in annular chamber between inner wall
Spring (013).
7. power plant coal machine tie-rod sealing attachment device as claimed in claim 6, it is characterized in that: elastic ring body top is equipped with
Two elastic arms corresponding with upper cylinder ring (09) two sidewalls, i.e., interior upper elastic arm (018) and outside upper elastic arm (019), interior upper bullet
Together with the elastic fit of pull rod top, outside upper elastic arm fits together property arm with lower tube inner chamber wall lower part；Under elastic ring body
Portion is equipped with two elastic arms corresponding with lower cylinder ring (010) two sidewalls, i.e., interior lower elastic arm (020) and outer lower elastic arm (021),
Interior lower elastic arm fits together with pull rod lower elastic, and outer lower elastic arm fits together with lower tube inner chamber wall lower part.
8. power plant coal machine tie-rod sealing attachment device as claimed in claim 7, it is characterized in that: fixed peace in sealing (05)
Equipped with the rubber ring (014) closed with the assembly of pull rod (5) elastic seal cartridge.
9. power plant coal machine tie-rod sealing attachment device as claimed in claim 8, it is characterized in that: hush panel (04) edge ring
Equipped with ring groove (015) corresponding with lower cylinder plate (02), falope ring (016) is installed in ring groove (015).
10. power plant coal machine tie-rod sealing attachment device as claimed in claim 9, it is characterized in that: being equipped in elastic ring body
With two column cavity loops (017) of elastic ring body coaxial arrangement, two column cavity loop (017) settings symmetrical above and below, two column cavity loops
(017) upper elastic arm and interior lower elastic arm are arranged respectively inwards in the middle part of elastic ring body lateral wall, and cavity loop (017)
Aperture is on the outside of the elastic ring body to inward side to becoming larger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710689084.8A CN109382196A (en) | 2017-08-13 | 2017-08-13 | Power plant coal machine tie-rod sealing attachment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710689084.8A CN109382196A (en) | 2017-08-13 | 2017-08-13 | Power plant coal machine tie-rod sealing attachment device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109382196A true CN109382196A (en) | 2019-02-26 |
Family
ID=65415601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710689084.8A Pending CN109382196A (en) | 2017-08-13 | 2017-08-13 | Power plant coal machine tie-rod sealing attachment device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109382196A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111366453A (en) * | 2020-04-29 | 2020-07-03 | 嘉善县科正建设工程检测有限公司 | Lower pressing plate circumferential sealing mechanism of universal testing machine |
| CN113606339A (en) * | 2021-07-30 | 2021-11-05 | 江门市鑫辉特种密封科技有限公司 | Combined labyrinth sealing device |
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| US6679500B1 (en) * | 2002-09-25 | 2004-01-20 | Alstom (Switzerland) Ltd | Coal pulverizer brush seal assembly |
| CN103267127A (en) * | 2013-05-23 | 2013-08-28 | 郭瑜 | Pull rod sealing structure of load-variable coal mill |
| CN203477324U (en) * | 2013-09-24 | 2014-03-12 | 赵新东 | Sealing device for pull rod of medium-speed coal mill |
| CN205371631U (en) * | 2016-01-07 | 2016-07-06 | 顾伟 | Coal pulverizer pull rod sealing device |
| CN206175656U (en) * | 2016-08-31 | 2017-05-17 | 龙口华龙电力设备有限公司 | Sealing device for pull rod of medium -speed coal mill |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6679500B1 (en) * | 2002-09-25 | 2004-01-20 | Alstom (Switzerland) Ltd | Coal pulverizer brush seal assembly |
| CN103267127A (en) * | 2013-05-23 | 2013-08-28 | 郭瑜 | Pull rod sealing structure of load-variable coal mill |
| CN203477324U (en) * | 2013-09-24 | 2014-03-12 | 赵新东 | Sealing device for pull rod of medium-speed coal mill |
| CN205371631U (en) * | 2016-01-07 | 2016-07-06 | 顾伟 | Coal pulverizer pull rod sealing device |
| CN206175656U (en) * | 2016-08-31 | 2017-05-17 | 龙口华龙电力设备有限公司 | Sealing device for pull rod of medium -speed coal mill |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111366453A (en) * | 2020-04-29 | 2020-07-03 | 嘉善县科正建设工程检测有限公司 | Lower pressing plate circumferential sealing mechanism of universal testing machine |
| CN111366453B (en) * | 2020-04-29 | 2022-07-01 | 嘉善县科正建设工程检测有限公司 | Lower pressing plate circumferential sealing mechanism of universal testing machine |
| CN113606339A (en) * | 2021-07-30 | 2021-11-05 | 江门市鑫辉特种密封科技有限公司 | Combined labyrinth sealing device |
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