CN112145525B - Auxiliary device for bonding split sealing ring and bonding method - Google Patents
Auxiliary device for bonding split sealing ring and bonding method Download PDFInfo
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- CN112145525B CN112145525B CN202011011917.3A CN202011011917A CN112145525B CN 112145525 B CN112145525 B CN 112145525B CN 202011011917 A CN202011011917 A CN 202011011917A CN 112145525 B CN112145525 B CN 112145525B
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- 238000007789 sealing Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000003825 pressing Methods 0.000 claims abstract description 24
- 230000007246 mechanism Effects 0.000 claims abstract description 20
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 12
- 239000003292 glue Substances 0.000 claims abstract description 10
- 230000006835 compression Effects 0.000 claims description 22
- 238000007906 compression Methods 0.000 claims description 22
- 238000005452 bending Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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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
- F16B11/00—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding
- F16B11/006—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Devices (AREA)
Abstract
The invention discloses an auxiliary device for bonding a split sealing ring and a bonding method, wherein the device comprises two clamping split sections in a split structure, and a detachable combined structure is formed between the two clamping split sections through a first positioning pin and a pressing mechanism; each clamping split is provided with an axial positioning structure and an axial pressing mechanism for limiting the axial position of the seal half ring, and a radial fine adjustment structure for adjusting the radial position of the seal half ring. The method is implemented based on the device, the sealing ring valve is fixed on the corresponding clamping split valve in a trial assembly and folding state, glue is coated after the sealing ring valve is separated, and finally, the sealing ring valve is folded and fixed to be dried. The auxiliary device has the advantages of simple structure and reliable function, and can be conveniently used for gluing and bonding the split sealing rings into a whole; the bonding method is simple to operate, the quality and consistency of the bonded product are good, the precision is high, and the hidden danger of oil leakage can be effectively eliminated or reduced.
Description
Technical Field
The invention relates to a manufacturing technology of a ship gearbox, in particular to an auxiliary device for bonding a split sealing ring and a bonding method.
Background
The mechanical seal is used as a dynamic seal for a rotating shaft, and has the characteristics of simple structure, stable performance, long service life and the like, so that the mechanical seal is widely applied to the fields of electric power, ships, aerospace, petrochemical industry and the like. The mechanical seal can be divided into two types according to the structural characteristics, namely an integral type and a split type. The integral mechanical seal is relatively less in use due to the reasons of higher later-stage maintenance and replacement cost or product structure limitation and the like, and on the contrary, the split mechanical seal is more and more widely used. According to the sealing principle of the mechanical seal, the sealing performance of the split mechanical seal depends on the assembly quality and the assembly precision, particularly the bonding precision of the sealing ring. At present, a sealing ring of a split type mechanical seal is mainly bonded by manual bare-handed bonding, the bonding quality and the bonding precision are difficult to ensure, the consistency of a bonded product is poor, and the hidden danger of oil leakage exists. Therefore, improvements are needed.
Disclosure of Invention
The invention aims to overcome the defect that the existing split mechanical sealing ring has oil leakage hidden trouble due to manual bonding, and provides an auxiliary device for bonding a split sealing ring. The adhesive bonding device is simple in structure, convenient to bond, good in product quality and consistency after bonding, high in precision and capable of effectively eliminating or reducing oil leakage hidden dangers. The second purpose of the invention is to provide a split type mechanical sealing ring bonding method based on the device.
In order to achieve the first object, the invention adopts the following technical scheme.
An auxiliary device for bonding a split sealing ring comprises two clamping split parts in a split structure, wherein a detachable combined structure is formed between the two clamping split parts through a first positioning pin and a pressing mechanism; and each clamping split is provided with an axial positioning structure and an axial pressing mechanism for limiting the axial position of the seal half ring, and a radial fine adjustment structure for adjusting the radial position of the seal half ring.
According to the invention adopting the technical scheme, the auxiliary tool for installing the split sealing ring is formed by combining two clamping split parts of the split structure, the two additional split parts are accurately positioned through the first positioning pin so as to ensure that the accuracy reproducibility after each combination is strong, the radial fine adjustment structure, the axial positioning structure and the axial pressing mechanism are arranged to ensure that the loaded sealing ring split parts can keep the position accuracy on the clamping split parts, and the split surfaces can be basically superposed with the joint surfaces of the two clamping split parts so as to facilitate the gluing operation; so as to complete the gluing and the bonding combination after gluing under the condition of fixed position. The adhesive bonding device is simple in structure, convenient to bond, good in product quality and consistency after bonding, high in precision and capable of effectively eliminating or reducing oil leakage hidden dangers.
Preferably, the axial positioning structure is formed by a semi-ring table top on which the split is clamped; the axial compression mechanism comprises at least one support arm, one end of the support arm is fixedly connected with or integrally formed on the clamping split and is positioned outside the side wall of the clamping split, the other end of the support arm is bent towards the direction of the circle center after axially extending for a set length, a compression screw is screwed on the bending section, and the far end of the compression screw faces the semi-ring table-board; the radial fine adjustment structure comprises fine adjustment screw holes arranged on the side wall of the clamping split, and fine adjustment screws are screwed in the fine adjustment screw holes. The clamping split is formed by a simple structure, wherein the semi-ring table-board and the clamping split side wall can be formed by a semi-ring step-shaped component with an integral structure, and can also be made into a split type combined structure; can be flexibly selected according to specific processing conditions.
Preferably, the clamping split comprises an axial positioning half ring and a radial positioning half ring which are fixedly connected with each other and concentrically arranged; the semi-ring table surface is formed on one side surface of the axial positioning semi-ring; the radial positioning semi-rings form the clamping valving side walls. So that the semi-ring table-board and the clamping split side wall form a detachable split type combined structure, the semi-ring table-board is conveniently processed in a plane grinding mode, the planeness is ensured, and the processing difficulty and the cost are reduced.
Still further preferably, the axial positioning half ring and the radial positioning half ring are fixedly connected through a first screw, and a position fixation is formed between the axial positioning half ring and the radial positioning half ring through a second positioning pin. So as to ensure strong precision reproduction capability after repeated assembly when used for multiple times.
Preferably, the pressing mechanism comprises two pull rods which are arranged in parallel and one end of each pull rod is provided with a head, the other end of each pull rod penetrates through two through holes in the clamping split, a transverse through hole is formed in the other end of each pull rod, a pin shaft penetrates through the transverse through hole, an eccentric wheel is fixedly connected to the pin shaft, and a loading handle is fixedly connected to the eccentric wheel. The combination precision of the viscous sealing ring is ensured by utilizing the characteristics of large pressing force and reliable pressing in an eccentric pressing mode.
Preferably, the compressing mechanism further comprises two pre-tightening screws for clamping, sectioning, pre-tightening and fixing, the pre-tightening screws and the pull rods are arranged in a staggered mode in the axial direction and the radial direction, and the distance between the two pre-tightening screws is smaller than the distance between the two pull rods. The two clamping split parts are temporarily connected together by utilizing a pre-tightening screw, so that a pull rod component and the like are conveniently arranged; after the two pieces are glued and folded, the glue is tightly pressed by mainly utilizing a pull rod and an eccentric wheel; preferably, the pretensioning screw is arranged close to the axial positioning structure, and the pull rod is arranged close to the axial pressing mechanism, so that the axial positioning structure is prevented from being deformed as much as possible during strong pressing.
In order to achieve the second object, the invention adopts the following technical scheme.
A method for bonding a split sealing ring is implemented on the basis of a device for realizing the first purpose; firstly, respectively arranging two halves of a split sealing ring into two clamping split parts, and carrying out radial adjustment and axial compression on the two halves of the split sealing ring under the pre-compression condition after the two clamping split parts are folded; secondly, after the two clamping split sections are split, gluing on the joint surfaces of the two split seal rings; and then, folding and compressing the two clamping split valves on the mounting shaft, standing for a set time, and dismantling the two clamping split valves after the glue solution is solidified.
According to the invention adopting the technical scheme, the two sections of the sealing ring are aligned firstly by using the bonding auxiliary device and then are fixed by using the auxiliary device, then the two sections of the sealing ring are respectively coated with glue by using the auxiliary device in a decomposition state, finally, the two sections of the sealing ring are combined on the rotating shaft by using the characteristic of high resetting precision of the auxiliary device, and after the glue is solidified, the auxiliary device is removed. The method is simple to operate, the quality and consistency of the bonded product are good, the precision is high, and the hidden danger of oil leakage can be effectively eliminated or reduced.
Preferably, in the process that the two glued clamping split pieces are folded and compressed on the mounting shaft, the pre-tightening screw is loosened under the state of being compressed by proper force, and then the clamping split pieces are compressed by strong force. So as to avoid damage to the pre-tightening screw in the process of strong pressing.
Preferably, before the two halves of the split sealing ring are respectively arranged into the two clamping split halves, the working surface of the sealing ring is determined, the clamping screw is arranged in a manner of being close to the working surface, and the clamping screw and the working surface are compressed after being provided with the cushion. So as to avoid damaging the working surface of the sealing ring; wherein, the seal ring with the working surface and the non-working surface marked separately is determined according to the mark; and for the seal ring without the distinguishing mark, selecting one surface with better surface quality as a working surface.
The auxiliary device has the advantages of simple structure and reliable function, and can be conveniently used for gluing and bonding the split sealing rings into a whole; the bonding method is simple to operate, the quality and consistency of the bonded product are good, the precision is high, and the hidden danger of oil leakage can be effectively eliminated or reduced.
Drawings
FIG. 1 is a front view of the device of the present invention.
Fig. 2 is a rotary sectional view a-a of fig. 1 of the present invention.
Fig. 3 is a rotary sectional view B-B of fig. 1 of the present invention.
The above figures also serve to illustrate the bonding method of the present invention.
Detailed Description
The present invention is further described with reference to the accompanying drawings, but the invention is not limited thereby within the scope of the described embodiments.
Embodiment 1, refer to fig. 1, 2, and 3, an auxiliary device for bonding a split sealing ring includes two split clamping split halves having a split structure, and a first positioning pin 8 and a pressing mechanism are arranged between the two split clamping split halves to form a detachable combined structure; each clamping split is provided with an axial positioning structure and an axial pressing mechanism for limiting the axial position of the seal half ring, and a radial fine adjustment structure for adjusting the radial position of the seal half ring.
Wherein, the axial positioning structure is composed of a semi-ring table top clamped on the split; the axial compression mechanism comprises at least one support arm 5, one end of the support arm 5 is fixedly connected or integrally formed on the clamping split and positioned outside the side wall of the clamping split, the other end of the support arm is bent towards the direction of the circle center after axially extending for a set length, a compression screw 6 is screwed on the bending section, and the far end of the compression screw 6 faces the semi-ring table top; the radial fine adjustment structure comprises fine adjustment screw holes arranged on the side wall of the clamping split, and fine adjustment screws 3 are screwed in the fine adjustment screw holes. The clamping and valving comprises an axial positioning semi-ring 1 and a radial positioning semi-ring 2 which are fixedly connected with each other and concentrically arranged; the semi-ring table surface is formed on one side surface of the axial positioning semi-ring 1; the radial positioning semi-rings 2 form a clamping split side wall. The axial positioning half ring 1 and the radial positioning half ring 2 are fixedly connected through a first screw 11, and position fixation is formed between the axial positioning half ring and the radial positioning half ring through a second positioning pin 7; the support arm 5 is fixedly connected to the axial positioning semi-ring 1 through a second screw 4, is positioned outside the radial positioning semi-ring 2, and has a bending section extending towards the direction of the circle center and radially strides over the radial positioning semi-ring 2; of course, the arms 5 can also be formed integrally on the axial positioning half ring 1.
The pressing mechanism comprises two pull rods 10 which are arranged in parallel and one end of each pull rod is provided with a head, the other end of each pull rod 10 penetrates through two through holes in the clamping split, a transverse through hole is formed in the other end of each pull rod, a pin shaft 14 penetrates through the transverse through hole, an eccentric wheel is fixedly connected to the pin shaft 14, and a loading handle 9 is fixedly connected to the eccentric wheel. Wherein, the through holes for inserting the pull rod 10 on the clamping split are formed on the connecting lugs of the radial positioning semi-rings 2. In addition, the pressing mechanism further comprises two pre-tightening screws 12 for clamping, splitting and pre-tightening and fixing, the pre-tightening screws 12 and the pull rods 10 are arranged in a staggered mode in the axial direction and the radial direction, and the distance between the two pre-tightening screws 12 is smaller than the distance between the two pull rods 10. The pre-tightening screw 12 penetrates through a pre-tightening screw penetrating hole on one axial positioning half ring 1 and then is screwed on the other axial positioning half ring 1.
In the embodiment, three fine adjustment screws 3 on each radial positioning half ring 2 are uniformly distributed; two support arms 5 on the axial positioning semi-ring 1 are arranged, and the fine adjustment screws 3 and the support arms 5 are arranged in a staggered mode in the circumferential direction. To ensure accurate positioning and compression of the sealing ring flap.
Embodiment 2, a method for bonding a split seal ring is implemented based on a device for achieving the first object; firstly, respectively arranging two halves of a split sealing ring into two clamping split parts, and carrying out radial adjustment and axial compression on the two halves of the split sealing ring under the pre-compression condition after the two clamping split parts are folded; secondly, after the two clamping split sections are split, gluing on the joint surfaces of the two split seal rings; and then, folding and compressing the two clamping split valves on the mounting shaft, standing for a set time, and dismantling the two clamping split valves after the glue solution is solidified.
Wherein, in the process that the two glued clamping split pieces are folded and compressed on the mounting shaft, the process comprises loosening the pretightening screw under the state of being compressed by proper force and then strongly compressing. Before two split sealing rings are respectively arranged in two clamping split parts, the working surface of the sealing ring is determined, the clamping split parts are arranged in a mode that a pressing screw is close to the working surface, and the pressing screw and the working surface are provided with cushions and then are pressed.
The method specifically comprises the following steps:
firstly, preparing: the method comprises the following steps of determining a split seal ring working surface and auxiliary device combination: wherein the content of the first and second substances,
determining the working surface of the split sealing ring comprises a sealing ring with a working surface and a non-working surface which are marked partially, and determining the working surface according to the mark; selecting one surface with better surface quality as a working surface of the seal ring without the resolution mark;
the auxiliary device combination comprises that according to the figure 1, the figure 2 and the figure 3, a plurality of support arms 5 are respectively fixedly connected on the corresponding axial positioning semi-ring 1 by using second screws 4, and compression screws 6 are screwed on the support arms 5, and the front ends of the compression screws 6 are not exposed out of the inner side surfaces of the support arms 5 as much as possible; fixedly connecting the axial positioning half ring 1 and the radial positioning half ring 2 together by using a second positioning pin 7 and a first screw 11, screwing a fine adjustment screw 3 on the radial positioning half ring 2, and enabling the front end of the fine adjustment screw 3 not to expose the inner wall surface of the radial positioning half ring 2 as far as possible so as to form two clamping split halves; then, on the simulation rotating shaft, two clamping split parts of the auxiliary device are folded by using the first positioning pin 8 and the pre-tightening screw 12 to form temporary fixation; then, a pull rod 10 with a gasket 13 is arranged on the two clamping split parts in a penetrating way, an eccentric wheel with a pin shaft 14 and a loading handle 9 is additionally arranged at the exposed end of the pull rod 10, and the two clamping split parts are fixed together by the loading handle 9.
Secondly, trial installation and positioning of the sealing ring: respectively installing the two halves of the split type sealing ring into the two clamping split halves of the auxiliary device, wherein the non-working surface of the sealing ring and the axial positioning semi-ring 1 face the semi-ring table surface, and completely attaching the split surfaces of the two halves of the split type sealing ring through a fine adjustment screw 3; then, a compression screw 6 pushes and presses the sealing ring to ensure that the non-working surface of each section of the sealing ring is tightly attached to the table surface of the semi-ring and then fixed on the corresponding clamping split section; a soft rubber pad is arranged between the compression screw 6 and the corresponding sealing ring flap;
thirdly, gluing a bonding surface: separating the two clamping split parts according to the reverse sequence of the folding of the two clamping split parts, and then respectively coating glue on the joint surfaces of the two split sealing rings;
fourthly, bonding and fixing: and after the glue solution is dried, closing the two clamping split valves on the mounting shaft again, standing for a set time, and detaching the two clamping split valves after the glue solution is cured.
In the method, the bonding and fixing can be performed on the simulated rotating shaft under the condition that the rotating shaft has a space for integrally installing the sealing ring.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. The auxiliary device for bonding the split sealing ring is characterized by comprising two clamping split parts in a split structure, wherein a split combined structure is formed between the two clamping split parts through a first positioning pin (8) and a pressing mechanism; an axial positioning structure and an axial pressing mechanism for limiting the axial position of the seal half ring and a radial fine adjustment structure for adjusting the radial position of the seal half ring are formed on each clamping split; the axial positioning structure is formed by a semi-ring table top clamped on the split; the axial compression mechanism comprises at least one support arm (5), one end of the support arm (5) is fixedly connected with or integrally formed on the clamping split and is positioned outside the side wall of the clamping split, the other end of the support arm axially extends for a set length and then is bent towards the direction of a circle center, a compression screw (6) is screwed on a bending section, and the far end of the compression screw (6) faces towards the semi-ring table board; the radial fine adjustment structure comprises fine adjustment screw holes arranged on the side wall of the clamping split, and fine adjustment screws (3) are screwed in the fine adjustment screw holes.
2. Device according to claim 1, characterized in that said clip-on valving comprises an axial positioning half-ring (1) and a radial positioning half-ring (2) fixedly connected to each other and arranged concentrically; the semi-ring table surface is formed on one side surface of the axial positioning semi-ring (1); the radial positioning half rings (2) form the clamping split side wall.
3. Device according to claim 2, characterized in that the axial positioning half-ring (1) and the radial positioning half-ring (2) are fixedly connected by means of a first screw (11) and are also positionally fixed by means of a second positioning pin (7).
4. The device according to any one of claims 1 to 3, wherein the pressing mechanism comprises two parallel pull rods (10) with a head at one end, the other end of each pull rod (10) passes through two through holes on the clamping split, a transverse through hole is formed in the other end, a pin shaft (14) is arranged in the transverse through hole in a penetrating manner, an eccentric wheel is fixedly connected to the pin shaft (14), and a loading handle (9) is fixedly connected to the eccentric wheel.
5. The device according to claim 4, characterized in that the compressing mechanism further comprises two pre-tightening screws (12) for pre-tightening and fixing two clamping split parts, the pre-tightening screws (12) and the pull rods (10) are arranged in a staggered manner in both axial and radial directions, and the distance between the two pre-tightening screws (12) is smaller than the distance between the two pull rods (10).
6. The device according to claim 5, characterized in that the pretension screw (12) is adjacent to the axial positioning structure and the tension rod (10) is adjacent to the axial compression mechanism.
7. A split seal ring bonding method is characterized by being implemented based on the device of any one of claims 1-6; firstly, respectively arranging two halves of a split sealing ring into two clamping split parts, and carrying out radial adjustment and axial compression on the two halves of the split sealing ring under the pre-compression condition after the two clamping split parts are folded; secondly, after the two clamping split sections are split, gluing on the joint surfaces of the two split seal rings; and then, folding and compressing the two clamping split valves on the mounting shaft, standing for a set time, and dismantling the two clamping split valves after the glue solution is solidified.
8. The method of claim 7, wherein the gluing of the two clip halves during the closing and pressing on the mounting shaft includes loosening the pre-tightening screw under a state of pressing with a proper force and then pressing with a strong force.
9. The method of claim 7, wherein prior to installing the two halves of the split seal ring into the two clip-on halves, respectively, comprising defining the running surface of the seal ring and installing the set screw adjacent the running surface, and applying compression after the running surface and set screw are cushioned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011011917.3A CN112145525B (en) | 2020-09-23 | 2020-09-23 | Auxiliary device for bonding split sealing ring and bonding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011011917.3A CN112145525B (en) | 2020-09-23 | 2020-09-23 | Auxiliary device for bonding split sealing ring and bonding method |
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| Publication Number | Publication Date |
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| CN112145525A CN112145525A (en) | 2020-12-29 |
| CN112145525B true CN112145525B (en) | 2022-02-01 |
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| CN202011011917.3A Active CN112145525B (en) | 2020-09-23 | 2020-09-23 | Auxiliary device for bonding split sealing ring and bonding method |
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| CN103307284A (en) * | 2013-07-10 | 2013-09-18 | 南京林业大学 | Split type mechanical seal with self-tightening sealing capacity |
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| DK176821B1 (en) * | 2007-10-03 | 2009-11-02 | Trelleborg Sealing Solutions Helsingor As | WELDING PTFE PARTS |
| CN102042409A (en) * | 2010-10-19 | 2011-05-04 | 东台市远洋船舶配件有限公司 | Rubber-plastic seal ring with section seam, bonding method of section seam and vulcanization bonding die for section seam |
| CN102494142A (en) * | 2011-12-01 | 2012-06-13 | 邓伦胜 | Double-split combined oil seal |
| CN103233911A (en) * | 2013-04-13 | 2013-08-07 | 丹东克隆集团有限责任公司 | Divided-plate ring type sealing deivce |
| CN203680130U (en) * | 2014-01-09 | 2014-07-02 | 国电联合动力技术有限公司 | Tool used for splicing split sealing ring |
| JP2017155861A (en) * | 2016-03-02 | 2017-09-07 | Ntn株式会社 | Seal member and bearing with seal |
| CN107745529B (en) * | 2017-10-17 | 2019-04-30 | 吴忠仪表有限责任公司 | O-ring cuts adhesive tool and its processing method |
| CN108591472A (en) * | 2018-07-26 | 2018-09-28 | 重庆齿轮箱有限责任公司 | A kind of adhering device of oil seal without framework |
| CN109681749B (en) * | 2018-12-19 | 2020-04-24 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Rotor position detection installation assembly and magnetic suspension bearing |
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| JPS5059467A (en) * | 1973-09-26 | 1975-05-22 | ||
| CN202280838U (en) * | 2011-10-29 | 2012-06-20 | 李川 | Rubber and plastic combined splitting-type opening oil seal |
| CN103307284A (en) * | 2013-07-10 | 2013-09-18 | 南京林业大学 | Split type mechanical seal with self-tightening sealing capacity |
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