CN111070750B - Production method of combined sealing element - Google Patents
Production method of combined sealing element Download PDFInfo
- Publication number
- CN111070750B CN111070750B CN201911164220.7A CN201911164220A CN111070750B CN 111070750 B CN111070750 B CN 111070750B CN 201911164220 A CN201911164220 A CN 201911164220A CN 111070750 B CN111070750 B CN 111070750B
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- hole
- fabric interlayer
- rubber layer
- mandrel
- fabric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D99/00—Subject matter not provided for in other groups of this subclass
- B29D99/0053—Producing sealings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1284—Application of adhesive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B2038/0052—Other operations not otherwise provided for
- B32B2038/0076—Curing, vulcanising, cross-linking
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Diaphragms And Bellows (AREA)
Abstract
The invention provides a production method of a combined sealing element, which at least comprises the following steps: 1) a first through hole is formed in the middle of the fabric interlayer; 2) sleeving a fabric interlayer on a preheated mandrel in an interference manner, wherein the outer diameter of the mandrel is equal to the diameter of a valve rod, and heating the mandrel to enable the fabric interlayer to form a melting part on the hole wall of an inner hole of the mandrel; 3) sequentially stacking the first rubber layer, the fabric interlayer and the second rubber layer and shaping in a fabric preforming mold to form a membrane body; 4) and putting the membrane body into a forming die for vulcanization forming. By adopting the production method of the combined sealing element in the technical scheme, the production method can improve the strength of the combined sealing element at the orifice, avoid the diaphragm from cracking at the weak position of the orifice, and improve the service life and reliability of the combined sealing element.
Description
Technical Field
The invention relates to the technical field of valve sealing, in particular to a production method of a combined sealing element.
Background
The diaphragm valve is a special type of cut-off valve, and its opening and closing part is a production method of combined sealing element made of soft material, and can separate the inner cavity of valve body from the inner cavity of valve cover and drive component, so that it can be extensively used in various fields.
In the diaphragm valve, the protruding portion that the diaphragm valve diaphragm is located between piston and the cylinder body takes place to roll at the course of the work, in whole roll in-process, the whole cross-section of diaphragm valve diaphragm is tensile under the pressure effect that receives gas, though there are clamp plate and tray to compress tightly near the diaphragm drill way, and cross-section intermediate position still has the fabric to strengthen, nevertheless because the fabric in diaphragm drill way department (no matter be vulcanization back stamping forming, direct compression molding when vulcanizing still is equipped with the through-hole and leads to its inner circle discontinuous (diaphragm drill way shaping can have the through-hole in the middle part of the fabric to lead to the fabric disconnection), drill way intensity is obvious not enough, and the circumference distributes inhomogeneously, the position that leads to final intensity weakest is located drill way all the time. During the reciprocating process of the diaphragm valve membrane along with the tray, the periphery of the hole opening is fatigued due to the continuous action of tensile stress, the tensile strength of the hole opening is reduced sharply, when the tensile strength of a certain position of the hole opening is reduced to be insufficient to overcome the action of gas pressure, the weakest part of the periphery of the hole opening begins to crack, and then the crack gradually expands outwards from the hole opening along the radial direction, so that the diaphragm valve membrane fails.
Disclosure of Invention
The invention aims to provide a production method of a combined sealing element, which can improve the strength of the combined sealing element at an orifice, avoid the diaphragm from cracking at the weak position of the orifice and improve the service life and reliability of the combined sealing element.
Based on this, the invention provides a method for producing a composite seal, comprising at least the following steps:
1) a first through hole is formed in the middle of the fabric interlayer;
2) sleeving a fabric interlayer on a preheated mandrel in an interference manner, wherein the outer diameter of the mandrel is equal to the diameter of a valve rod, and heating the mandrel to enable the fabric interlayer to form a melting part on the hole wall of an inner hole of the mandrel;
3) sequentially stacking the first rubber layer, the fabric interlayer and the second rubber layer and shaping in a fabric preforming mold to form a membrane body;
4) and putting the membrane body into a forming die for vulcanization forming.
Preferably, the specific operation process of step 1 is as follows:
and punching to obtain the annular fabric interlayer which is adaptive to the membrane body, wherein the diameter of the punched first through hole is 0-5 mm smaller than the outer diameter of the core shaft.
Preferably, the specific operation process of step 2 is as follows:
installing a mandrel on a heat insulation plate, sleeving the annular fabric interlayer into the preheated mandrel, contacting the bottom surface of the fabric interlayer with the heat insulation plate, heating the mandrel to the melting point temperature of the fabric interlayer, keeping the temperature for 5-20 seconds, and taking out.
Preferably, the specific operation process of step 3 is as follows:
and coating adhesives on two end faces of the fabric interlayer, and bonding the first rubber layer, the fabric interlayer and the second rubber layer and placing the rubber layers in a preforming mold for shaping.
Preferably, the preforming mold comprises two oppositely arranged clamping plates, the distance between the two clamping plates is adjustable, and the diaphragm body is clamped between the two clamping plates for shaping.
Preferably, the specific operation process of step 4 is as follows:
and setting vulcanization parameters, and forming a second through hole matched with the valve rod in the middle of the diaphragm body, wherein the diameter of the second through hole is equal to that of the valve rod.
Preferably, in the vulcanization process of the diaphragm body in the step 4, a plurality of blind holes are formed in the periphery of the diaphragm body, and the blind holes are located on the same circumference.
Preferably, after the step 4, the blind holes are punched to obtain a plurality of connecting through holes for fixing the diaphragm body.
Preferably, the diaphragm body comprises a protruding portion and a skirt edge arranged on the periphery of the protruding portion, the protruding portion is higher than the skirt edge and forms a hat-shaped structure, the second through hole is formed in the protruding portion, and the connecting through hole is formed in the skirt edge.
Preferably, the thickness values of the first rubber layer and the second rubber layer are greater than the thickness value of the textile interlayer, and the thickness values of the first rubber layer and the second rubber layer are equal.
The embodiment of the invention has the following beneficial effects:
the combined sealing element produced by the method comprises a first rubber layer, a fabric interlayer and a second rubber layer which are arranged in a stacked mode, the core shaft is heated, so that a melting part is formed on the wall of an inner hole of the fabric interlayer, the fabric interlayer is strengthened at the first through hole, the weakest area of the fabric interlayer close to the first through hole is strengthened, the tear resistance strength of the periphery of the opening of the first through hole can be greatly improved, the phenomenon that the sealing element fails due to the fact that the periphery of the first through hole is broken is avoided, and therefore the reliability and the service life of the combined sealing element are improved; when the sealing element is produced, the fabric preforming mold is shaped to form the membrane body, so that the membrane body is preliminarily fixed, the vulcanization molding of the membrane is convenient, and the performance of the sealing element obtained by the vulcanization molding meets the sealing requirement of the diaphragm valve.
Drawings
FIG. 1 is a flow chart of the production of a composite seal according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a diaphragm body according to an embodiment of the present invention.
FIG. 3 is a top view of a diaphragm body in an embodiment of the invention.
Figure 4 is a schematic representation of the structure of a fabric sandwich in accordance with an embodiment of the present invention when heated.
FIG. 5 is a schematic diagram of a fused portion of a fabric insert in accordance with an embodiment of the present invention.
In the figure: 100. a diaphragm body; 1. a fabric interlayer; 2. a first rubber layer; 3. a second rubber layer; 4. a mandrel; 5. a heat insulation plate; 6. a first through hole; 6a, a melting part; 7. a second through hole; 8. and connecting the through holes.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
As shown in fig. 1 to 5, the present embodiment provides a method for producing a composite seal, which at least includes the following steps:
1) the middle part of the fabric interlayer 1 is provided with a first through hole 6, specifically, the combined sealing element in this embodiment is a diaphragm valve membrane, the fabric interlayer 1 belongs to a part of the membrane body 100, the fabric interlayer 1 can effectively improve the overall structural strength of the membrane body 100, so as to prevent the membrane body 100 from being stressed and stretched, the aperture of the first through hole 6 is smaller than that of the second through hole 7, the membrane body 100 comprises a first rubber layer 2, the fabric interlayer 1 and a second rubber layer 3 which are sequentially stacked, the middle part of the membrane body 100 is provided with the second through hole 7 for a valve rod to pass through, it is noted that the membrane body 100 is mounted on the valve rod through the second through hole 7, and the membrane body 100 is connected with the housing of the diaphragm valve, and plays a role of end face static sealing through the compression of a tray and a pressing plate with the first rubber layer 2 and the second rubber layer 3, the arrangement mode belongs to the prior art, and is not described herein, and the fabric interlayer 1 is discontinuous and easy to break because the first through hole 6 is arranged in the middle of the fabric interlayer 1;
2) the preheating mandrel 4 is sleeved with the fabric interlayer 1 in an interference fit mode, the outer diameter of the mandrel 4 is equal to the diameter of the valve rod, the mandrel 4 is heated, so that the fabric interlayer 1 forms a melting part 6a on the hole wall of an inner hole of the fabric interlayer 1, the first through hole 6 is strengthened, the weakest area of the fabric interlayer 1 close to the first through hole 6 is strengthened, and the phenomenon that the sealing element fails due to the fact that the peripheral part of the first through hole 6 is broken is avoided. It should be noted that the aperture of the melted first through hole 6 is the same as the aperture of the second through hole 7, that is, the diaphragm body 100 can be inserted into the valve stem;
3) sequentially stacking the first rubber layer 2, the fabric interlayer 1 and the second rubber layer 3 and shaping in a fabric preforming mold to form the membrane body 100, so that the membrane body 100 is preliminarily fixed, and the vulcanization molding of the membrane is facilitated;
4) the membrane body 100 is placed into a forming die for vulcanization forming, sulfur cross-linking occurs in the vulcanization process, the process means that one or more sulfur atoms are connected to a polymer chain to form a bridge-shaped structure, the performance of the membrane body 100 after vulcanization forming is changed in many aspects, and physical properties, namely plastic rubber, are converted into elastic rubber or hard rubber, so that the sealing requirement of the membrane body 100 is met, and it is pointed out that the membrane body 100 obtained in the vulcanization forming process is in a hat-shaped structure, so that the use requirement of a sealing element is met.
Based on the technical scheme, the combined sealing element produced by the method comprises a first rubber layer 2, a fabric interlayer 1 and a second rubber layer 3 which are arranged in a stacked mode, the mandrel 4 is heated, so that a melting part 6a is formed on the wall of the inner hole of the fabric interlayer 1, the fabric interlayer 1 is strengthened at the first through hole 6, the weakest area of the fabric interlayer 1 close to the first through hole 6 is strengthened, the tear strength of the periphery of the orifice of the first through hole 6 can be greatly improved, the phenomenon that the sealing element fails due to the fact that the periphery of the first through hole 6 is broken is avoided, and therefore the reliability and the service life of the combined sealing element are improved; when the sealing element is produced, the fabric pre-forming die is shaped to form the membrane body 100, so that the membrane body 100 is preliminarily fixed, the vulcanization forming of the membrane is facilitated, and the performance of the sealing element obtained through the vulcanization forming meets the sealing requirement of the diaphragm valve.
In this embodiment, the specific operation process of step 1 is: the annular fabric interlayer 1 corresponding to the diaphragm body 100 is obtained by punching, and the diameter of the punched first through hole 6 is 0-5 mm smaller than the outer diameter of the mandrel 4, so that the fabric interlayer 1 is arranged on the mandrel 4 in an interference manner, and the fabric interlayer 1 can form a melting part 6a at the first through hole 6 when the mandrel 4 is heated, so that the structure of the fabric interlayer 1 at the first through hole 6 is strengthened, and the first through hole 6 can be matched with a valve rod after the aperture of the melting part 6a is enlarged. Further, the specific operation process of step 2 is as follows: the core shaft 4 is arranged on a heat insulation plate 5, the annular fabric interlayer 1 is sleeved into the preheated core shaft 4, the bottom surface of the fabric interlayer 1 is in contact with the heat insulation plate 5, the heat insulation plate 5 can prevent other parts of the fabric interlayer 1 from being heated and melted, and the functions of fixing the core shaft 4 and supporting the fabric interlayer 1 are also achieved. Heating the mandrel 4 to the melting point temperature of the fabric interlayer 1, keeping the temperature for 5-20 seconds, and then taking out, in this embodiment, the material of the fabric interlayer 1 is selected as polyester fabric, the melting point temperature is 110-.
The specific operation process of the step 3 is as follows: and coating adhesives on two end faces of the fabric interlayer 1, thereby enabling the membrane body 100 to be stably connected, and bonding the first rubber layer 2, the fabric interlayer 1 and the second rubber layer 3 and placing the bonded layers in a pre-forming mold for shaping. Further, the preforming mold comprises two oppositely-arranged clamping plates, the distance between the two clamping plates is adjustable, the membrane body 100 is clamped between the two clamping plates for shaping, it needs to be pointed out that the membrane body 100 can be clamped and fixed through the clamping plate structure, the flatness of the membrane body 100 is good, and the specific structure of the preforming mold is not limited to the specific structure in the embodiment.
In addition, the specific operation process of step 4 is as follows: setting vulcanization parameters, forming a second through hole 7 matched with the valve rod in the middle of the membrane body 100, wherein the second through hole 7 is equal to the diameter of the valve rod, and it needs to be pointed out that the second through hole 7 and the first through hole 6 are coaxially arranged, and the second through hole 7 with the same size is formed in the middle of the membrane body 100 after vulcanization molding, so that the membrane body 100 can be sleeved on the valve rod.
In this embodiment, in the vulcanization process of the diaphragm body 100 in step 4, a plurality of blind holes are further formed in the periphery of the diaphragm body 100, and each blind hole is located on the same circumference. Further, after step 4, the blind holes are punched to obtain a plurality of connecting through holes 8 for fixing the diaphragm body 100, so that the screws are threaded into the connecting through holes 8, the diaphragm body 100 is fixed on the diaphragm valve housing, and the diaphragm body 100 stably operates.
Preferably, the diaphragm body 100 includes a raised portion and a skirt disposed at the periphery of the raised portion, the raised portion is disposed higher than the skirt and forms a hat-shaped structure, the second through hole 7 is disposed on the raised portion, and the connecting through hole 8 is disposed on the skirt, thereby making the diaphragm body 100 suitable for use in a diaphragm valve. Further, the thickness values of the first rubber layer 2 and the second rubber layer 3 are greater than the thickness value of the fabric interlayer 1, and the thickness values of the first rubber layer 2 and the second rubber layer 3 are equal, so that the diaphragm body 100 is stable in structure and is more suitable for diaphragm valves.
The combined sealing element produced by the method comprises a first rubber layer 2, a fabric interlayer 1 and a second rubber layer 3 which are arranged in a stacked mode, the mandrel 4 is heated to enable the fabric interlayer 1 to form a melting part 6a on the hole wall of the inner hole of the fabric interlayer 1, so that the fabric interlayer 1 is strengthened at the first through hole 6, the weakest area of the fabric interlayer 1 close to the first through hole 6 is strengthened, the tear resistance strength of the periphery of the hole opening of the first through hole 6 can be greatly improved, the phenomenon that the sealing element fails due to the fact that the periphery of the first through hole 6 is broken is avoided, and therefore reliability and service life of the combined sealing element are improved; when the sealing element is produced, the fabric pre-forming die is shaped to form the membrane body 100, so that the membrane body 100 is preliminarily fixed, the vulcanization forming of the membrane is facilitated, and the performance of the sealing element obtained through the vulcanization forming meets the sealing requirement of the diaphragm valve.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for producing a composite seal, characterized by comprising at least the following steps:
1) a first through hole is formed in the middle of the fabric interlayer;
2) sleeving a fabric interlayer on a preheated mandrel in an interference manner, wherein the outer diameter of the mandrel is equal to the diameter of a valve rod, heating the mandrel to enable the fabric interlayer to form a melting part on the hole wall of an inner hole of the mandrel, the melting part is used for reinforcing the weakest area of the fabric interlayer close to the first through hole, and the diameter of the melted first through hole is equal to the diameter of the valve rod;
3) sequentially stacking the first rubber layer, the fabric interlayer and the second rubber layer and shaping in a fabric preforming mold to form a membrane body;
4) and putting the membrane body into a forming die for vulcanization forming.
2. The method for producing a composite seal member according to claim 1, wherein the specific operation process of step 1 is as follows:
and punching to obtain the annular fabric interlayer which is adaptive to the membrane body, wherein the diameter of the punched first through hole is 0-5 mm smaller than the outer diameter of the core shaft.
3. The method for producing a composite seal member according to claim 2, wherein the specific operation process of step 2 is as follows:
installing a mandrel on a heat insulation plate, sleeving the annular fabric interlayer into the preheated mandrel, contacting the bottom surface of the fabric interlayer with the heat insulation plate, heating the mandrel to the melting point temperature of the fabric interlayer, keeping the temperature for 5-20 seconds, and taking out.
4. The method for producing a composite seal member according to claim 1, wherein the specific operation process of step 3 is as follows:
and coating adhesives on two end faces of the fabric interlayer, and bonding the first rubber layer, the fabric interlayer and the second rubber layer and placing the rubber layers in a preforming mold for shaping.
5. The method of claim 4, wherein the pre-forming mold comprises two opposing clamping plates, and the distance between the two clamping plates is adjustable, so as to clamp the membrane body between the two clamping plates for shaping.
6. The method for producing a composite seal member according to claim 1, wherein the specific operation process of step 4 is as follows:
and setting vulcanization parameters, and forming a second through hole matched with the valve rod in the middle of the diaphragm body, wherein the diameter of the second through hole is equal to that of the valve rod.
7. The method for producing a composite sealing member according to claim 6, wherein the diaphragm body in step 4 is vulcanized, and the diaphragm body is further formed with a plurality of blind holes on the outer periphery thereof, and the blind holes are located on the same circumference.
8. The method for producing a composite seal according to claim 7, wherein, after step 4, the blind holes are punched to obtain a plurality of connecting through holes for fixing the diaphragm body.
9. The method of claim 8, wherein the diaphragm body includes a protrusion and a skirt disposed at a periphery of the protrusion, the protrusion is disposed higher than the skirt and forms a hat structure, the second through hole is disposed on the protrusion, and the connecting through hole is disposed on the skirt.
10. The method of producing a composite seal according to claim 1, wherein said first rubber layer and said second rubber layer have a thickness value greater than a thickness value of said textile interlayer, and said first rubber layer and said second rubber layer have equal thickness values.
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| CN201911164220.7A CN111070750B (en) | 2019-11-22 | 2019-11-22 | Production method of combined sealing element |
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| CN201911164220.7A CN111070750B (en) | 2019-11-22 | 2019-11-22 | Production method of combined sealing element |
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| CN111070750B true CN111070750B (en) | 2022-04-22 |
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| CN108061159A (en) * | 2018-01-22 | 2018-05-22 | 江门市大长江集团有限公司 | The sealing diaphragm and its manufacturing technique method of fuel pump |
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| US5291822A (en) * | 1992-11-16 | 1994-03-08 | Orbital Walbro Corporation | Diaphragm for pressure regulators and method of making |
| US5852957A (en) * | 1995-03-23 | 1998-12-29 | Nichias Corporation | Separate plate for a control valve used in an automatic transmission and method for fabricating same |
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