CN114734664A - Continuous production device and production process of sealed capsules - Google Patents
Continuous production device and production process of sealed capsules Download PDFInfo
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- CN114734664A CN114734664A CN202210286871.9A CN202210286871A CN114734664A CN 114734664 A CN114734664 A CN 114734664A CN 202210286871 A CN202210286871 A CN 202210286871A CN 114734664 A CN114734664 A CN 114734664A
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Images
Classifications
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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
- B29D22/00—Producing hollow articles
- B29D22/02—Inflatable articles
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/221—Oxides; Hydroxides of metals of rare earth metal
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
Abstract
The utility model provides a continuous production device and a production process of a sealed capsule, wherein the continuous production device of the sealed capsule comprises an air bag preforming device, an air bag pressing detection device and a sealed capsule charging pressing device, wherein the air bag preforming device can extrude, feed, vulcanize and cool sealing rubber, and then cut to a fixed length to obtain an annular air bag part and a main body part of an air bag preforming product; the air bag pressing detection equipment comprises a flat plate mould pressing vulcanization unit and an air bag sealing detection unit, wherein the flat plate mould pressing vulcanization unit can press the annular air bag part of the air bag preformed product and the main body part of the air bag preformed product to form a complete air bag, and the air bag sealing detection unit can detect the sealing performance of the air bag; the sealed capsule forming equipment can press and form the middle parts of the air bag and the sealed capsule to obtain a finished sealed capsule. The utility model has the advantages of stable wall thickness of the air bag, consistent linear expansion, stable use, long service life and the like by adopting an extrusion preforming process.
Description
Technical Field
The utility model relates to the technical field of door seals in nuclear power steam generator maintenance, in particular to a continuous production device and a production process of a sealed capsule.
Background
In the operation process of the nuclear power station, a nuclear power station owner needs to send related operators to a product producing country for training besides purchasing the closure plate product. If an accident happens, a corresponding manufacturer needs to go to the site for repair, and the delayed time causes great economic loss to the delay of the maintenance work of the nuclear power plant.
In order to promote the localization process of the nuclear power technology supporting equipment in China and improve the reliability, economy and convenience of the subsequent nuclear power station refueling and maintenance process and the periodic maintenance of the nuclear power station evaporator, it is necessary to develop the design research of the primary side plugging plate sealing capsule of the nuclear power station steam generator. The factors such as the reliability of equipment, the economical efficiency of engineering, the convenience of maintenance work and the like are comprehensively considered by a team, the developed, produced and tested steam generator primary side plugging plate sealing capsule can be directly applied to the third-generation nuclear power project of China, and the related test conditions can also provide references for the design and improvement of steam generator plugging plates of other nuclear power stations.
The utility model discloses a utility model patent with publication number "CN 214377695U", title "a nuclear power evaporimeter closure plate and nuclear power evaporimeter" discloses a nuclear power evaporimeter closure plate structure, the closure plate can include sealed capsule, fixed plate and a plurality of fixed subassembly, wherein, sealed capsule is basin-shaped structure and includes annular section and the round platform section of connecting from top to bottom; an annular oblique mouth lip is arranged at the lower side of the annular section; the circular truncated cone section is provided with a cavity with an upward opening, the radial size of the upper end of the circular truncated cone section is larger than that of the lower end of the circular truncated cone section, and a plurality of annular air bags are arranged on the outer side of the circular truncated cone section; the fixing plate is also of a basin-shaped structure, can be embedded into the cavity of the sealed capsule, and the mutually opposite surfaces of the fixing plate and the cavity are attached; the fixing assembly can connect the sealing capsule and the fixing plate. The utility model has simple and convenient structure, good sealing stability, good compression resistance and wear resistance; the whole structure of the blocking plate is sleeved in by an inclined opening, so that the installation and the withdrawal are more efficient, and the installation and the withdrawal are convenient. However, the production of the air bag adopts a mould pressing process to produce the air bag by filling the air bag with glue one by one, so that the problems of cracks and uneven deformation of the air bag product in an inflated state are caused, the sealing effect of the air bag is poor, and the service life of the air bag is short. Therefore, a continuous production device is needed to be designed, an extrusion preforming process is adopted, the stability of the wall thickness of the air bag is guaranteed, meanwhile, the mould pressing process is adjusted, and long-section preforming continuous mould pressing is adopted, so that the linear expansion of the air bag is consistent, the use stability of the air bag is improved, and the service life of the air bag is prolonged.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to address one or more of the problems in the prior art described above. For example, it is an object of the present invention to provide a continuous production apparatus and process for producing sealed capsules using an extrusion preforming process, which is stable in wall thickness of the bladder, uniform in linear expansion, stable in use, and improved in life span.
In order to achieve the above object, the present invention provides, in one aspect, a continuous production apparatus for sealed capsules, comprising an airbag preforming device, an airbag pressing detection device, and a sealed capsule charging and pressing device, wherein,
the air bag preforming device comprises an extrusion feeding unit, a vulcanization conveying unit, a constant-temperature cooling unit and a conveying fixed-length cutting unit which are sequentially connected, wherein the extrusion feeding unit can extrude and feed production raw materials of sealing rubber or the sealing rubber to the vulcanization conveying unit, the vulcanization conveying unit can vulcanize the sealing rubber, the constant-temperature cooling unit can cool the vulcanized sealing rubber, and the conveying fixed-length cutting unit can cut the cooled sealing rubber to obtain an annular air bag part and an air bag preforming product main body part of an air bag preforming product;
the air bag pressing detection equipment comprises a flat plate die pressing vulcanization unit and an air bag sealing detection unit, wherein the flat plate die pressing vulcanization unit can press the annular air bag part of the air bag preformed product and the main body part of the air bag preformed product to form a complete air bag, and the air bag sealing detection unit can detect the sealing performance of the air bag;
the sealed capsule forming equipment can be used for pressing and forming the middle parts of the air bag and the sealed capsule to obtain a finished product sealed capsule.
In an exemplary embodiment of an aspect of the present invention, the continuous production apparatus may further include a sealing capsule detecting device capable of detecting sealing performance of a finished sealing capsule.
In an exemplary embodiment of an aspect of the present invention, the sidewall of the air bag, which is attached to the tube wall, may be provided with two or more D-shaped annular air bags, and the two or more D-shaped annular air bags may enable the air bag to linearly expand along a central position, attach to the tube wall, and maintain a triangular support structure under external medium pressure, thereby improving sealing performance.
In one exemplary embodiment of an aspect of the present invention, the sealing performance test of the sealed capsule may include an irradiation test, a long-term airtightness test, and an aging performance test.
In an exemplary embodiment of an aspect of the present invention, the sealing rubber may include 80 to 120 parts by mass of an ethylene propylene diene monomer, 10 to 30 parts by mass of an activator, 30 to 60 parts by mass of a reinforcing agent, 30 to 60 parts by mass of a softener, 30 to 90 parts by mass of a radiation resistant filler, 3 to 15 parts by mass of an accelerator, and 0.5 to 2 parts by mass of a vulcanizing agent.
In one exemplary embodiment of an aspect of the present invention, the active agent may include 5 to 10 parts by mass of zinc oxide, 1 to 3 parts by mass of stearic acid, and 5 to 10 parts by mass of a silane coupling agent.
In one exemplary embodiment of an aspect of the present invention, the radiation resistant filler may include 10 to 30 parts by mass of bismuth trioxide, 10 to 30 parts by mass of nano-barite, and 10 to 30 parts by mass of rare earth gadolinium oxide.
In an exemplary embodiment of an aspect of the present invention, the promoter may include 10 to 30 parts by mass of TBZTD, 10 to 30 parts by mass of CZ, 10 to 30 parts by mass of DM, 10 to 30 parts by mass of DTDC, and 10 to 30 parts by mass of BZ.
Another aspect of the present invention provides a continuous production process of sealed capsules, which is carried out by a continuous production apparatus of sealed capsules as described in any one of the above, and which comprises the steps of:
adding a sealing rubber raw material or sealing rubber into air bag preforming equipment according to a preset addition amount, and controlling the extrusion temperature and the extrusion speed to obtain an annular air bag part of an air bag preforming product and a main body part of the air bag preforming product;
placing the annular air bag part and the main body part of the air bag preformed product into air bag pressing detection equipment for vulcanization and pressing to form an air bag, and detecting the air bag;
and pressing and molding the middle parts of the air bag and the sealed capsule on the sealed capsule molding equipment to obtain the finished sealed capsule.
In an exemplary embodiment of another aspect of the present invention, the extrusion temperature may be 30 to 60 ℃, the extrusion speed of the sealing rubber may be 4 to 6 minutes/meter, and the extrusion pressure may be 4 to 6 Mpa;
the air bag detection can comprise natural state thickness detection, thickness detection after inflation under bare pressure and sealing detection.
Compared with the prior art, the beneficial effects of the utility model can comprise at least one of the following:
(1) the sealed capsule prepared by the utility model has the characteristics of high resilience and air inflation, stability, durability, easy installation and the like;
(2) the arc-shaped section in the sealed air bag is stably pressed under the extrusion of an internal medium, the D-shaped structure is locally thick, the linear expansion of the inflatable structure along the central position is realized, the inflatable structure is attached to the pipe wall, the triangular supporting structure is kept under the pressure of the external medium, and the sealing performance is improved;
(3) the utility model adopts the extrusion preforming process to ensure the stability of the wall thickness of the air bag, simultaneously adjusts the mould pressing process, adopts the long-section preforming continuous mould pressing and forming process to ensure that the linear expansion of the air bag is consistent, thereby improving the stability of the air bag in use and prolonging the service life.
Drawings
Figure 1 shows an overall layout of a continuous production apparatus for sealed capsules according to one exemplary embodiment of the present invention;
FIG. 2 shows a schematic structural view of an exemplary embodiment of the air bag preforming device of FIG. 1;
FIG. 3 illustrates a schematic structural view of an exemplary embodiment of the air bag compression sensing apparatus of FIG. 1;
FIG. 4 shows a schematic structural view of an exemplary embodiment of the sealed capsule charge pressing apparatus of FIG. 1;
FIG. 5 is a schematic diagram illustrating the construction of one exemplary embodiment of the sealed capsule testing apparatus of FIG. 1;
FIG. 6 shows a schematic structural view of an exemplary embodiment of the sealed capsule of FIG. 1;
fig. 7 shows a schematic cross-sectional structure of the balloon of fig. 6.
The reference numerals are explained below:
1-air bag preforming equipment, 11-extrusion feeding unit, 12-vulcanization conveying unit, 13-constant temperature cooling unit, 14-conveying fixed length cutting unit, 2-air bag pressing detection equipment, 21-flat plate die pressing vulcanization unit, 22-air bag sealing detection unit, 3-sealing air bag charging and pressing equipment, 4-sealing air bag detection equipment, 5-sealing air bag, 51-air bag, 51 a-annular air bag part of air bag preforming product, 51 b-main body part of air bag preforming product and 52-middle part of sealing air bag.
Detailed Description
Hereinafter, the continuous production apparatus and production process of the sealed capsule of the present invention will be described in detail with reference to exemplary embodiments.
It should be noted that "first," "second," and the like are merely for convenience of description and for ease of distinction, and are not to be construed as indicating or implying relative importance. "upper," "lower," "inner," and "outer" are merely for convenience of description and relative positional or orientational relationships and do not indicate or imply that the referenced components must have that particular orientation or position.
Figure 1 shows an overall layout of a continuous production apparatus for sealed capsules according to one exemplary embodiment of the present invention; FIG. 2 shows a schematic structural diagram of an exemplary embodiment of the air bag preforming device of FIG. 1; FIG. 3 illustrates a schematic structural view of an exemplary embodiment of the air bag compression detection apparatus of FIG. 1; FIG. 4 shows a schematic structural view of an exemplary embodiment of the sealed capsule charge pressing apparatus of FIG. 1; FIG. 5 is a schematic diagram illustrating the construction of one exemplary embodiment of the sealed capsule testing apparatus of FIG. 1; FIG. 6 shows a schematic structural view of an exemplary embodiment of the sealed capsule of FIG. 1; fig. 7 shows a schematic cross-sectional structure of the balloon of fig. 6.
In the first exemplary embodiment of the present invention, as shown in fig. 1, the continuous production apparatus of sealed capsules mainly includes an airbag preforming device 1, an airbag pressing detection device 2, and a sealed capsule charging pressing device 3.
The air bag preforming device 1 comprises an extrusion feeding unit 11, a vulcanization conveying unit 12, a constant temperature cooling unit 13 and a conveying fixed-length cutting unit 14 which are connected in sequence. Wherein, the extrusion feeding unit 11 can extrude and feed the production raw material of the sealing rubber or the sealing rubber to the vulcanization conveying unit 12, the vulcanization conveying unit 12 can vulcanize the sealing rubber, the constant temperature cooling unit 13 can cool the vulcanized sealing rubber, and the conveying fixed-length cutting unit 14 can cut the cooled sealing rubber to obtain an annular air bag part and an air bag preformed product main body part of the air bag preformed product.
In the present embodiment, as shown in fig. 1, 3, 6, and 7, the air bag press detecting apparatus 2 may include a flat press vulcanizing unit 21 and an air bag seal detecting unit 22. Wherein the flat press vulcanization unit 21 is capable of pressing the airbag preform product annular bladder portion 51a and the airbag preform product main body portion 51b to form a complete bladder. The airbag seal detection unit 22 can detect the sealing performance of the airbag 51.
In the present embodiment, as shown in fig. 1, 4 and 6, the sealed capsule forming apparatus 3 can press-form the air bladder 51 and the sealed capsule intermediate portion 52 to obtain the finished sealed capsule 5.
In the present exemplary embodiment, as shown in fig. 1 and 5, the continuous production apparatus may further include a sealed capsule inspection device 4, and the sealed capsule inspection device 4 may be capable of inspecting the sealing performance of the finished sealed capsule 5. Here, the sealing performance test of the sealed capsule may include an irradiation test, a long-term airtightness test, and an aging performance test, and table 1 gives specific contents of the sealing performance test.
TABLE 1 detection Standard for sealing Properties of sealed capsules
In the exemplary embodiment, the outer side wall of the arc-shaped section of the airbag can be provided with more than two annular airbags with D-shaped structures, and the more than two annular airbags with D-shaped structures can enable the airbag to linearly expand along the central position, fit with the pipe wall and maintain a triangular supporting structure under the pressure of an external medium, so that the sealing performance is improved. Here, as shown in fig. 6 and 7, the arc-shaped section of the airbag is stably compressed under the pressure of the internal medium, the local thickness of the D-shaped structure realizes the linear expansion of the inflatable structure along the central position, the inflatable structure is attached to the pipe wall, and the triangular supporting structure is maintained under the pressure of the external medium, so that the sealing performance is improved.
In the present exemplary embodiment, the sealing rubber may include 80 to 120 parts by mass of ethylene propylene diene monomer, 10 to 30 parts by mass of an activator, 30 to 60 parts by mass of a reinforcing agent, 30 to 60 parts by mass of a softener, 30 to 90 parts by mass of a radiation resistant filler, 3 to 15 parts by mass of an accelerator, and 0.5 to 2 parts by mass of a vulcanizing agent.
Further, the activator may include 5 to 10 parts by mass of zinc oxide, 1 to 3 parts by mass of stearic acid, and 5 to 10 parts by mass of a silane coupling agent.
Further, the anti-radiation filler can comprise 10-30 parts of bismuth trioxide, 10-30 parts of nano barite and 10-30 parts of rare earth gadolinium oxide in parts by mass.
Further, the accelerator can comprise 10-30 parts of TBZTD, 10-30 parts of CZ, 10-30 parts of DM, 10-30 parts of DTDC and 10-30 parts of BZ in parts by mass.
In a second exemplary embodiment of the present invention, a continuous production process of sealed capsules is realized by the continuous production apparatus of sealed capsules according to the first exemplary embodiment described above, and the continuous production process includes the steps of:
adding a sealing rubber raw material or sealing rubber into an air bag preforming device according to a preset adding amount, and controlling the extrusion temperature and the extrusion speed to obtain an annular air bag part of an air bag preforming product and a main body part of the air bag preforming product.
Specifically, the air bag preforming device is divided into a feeding hole, a material barrel 1 section, a material barrel 2 section, a material barrel 3 section and a conveying line, and specific process parameters are shown in the following table 2.
TABLE 2 Process parameter control Range in air bag preforming step
And putting the annular air bag part and the main air bag preformed product part of the air bag preformed product into air bag pressing detection equipment for vulcanization and pressing to form an air bag, and detecting the air bag. Specifically, the air bag pressing detection device comprises an upper die, a lower die and a diamond-shaped core rod, and the vulcanization and pressing for forming the air bag comprises six circulation steps, and the details are shown in the following table 3.
TABLE 3 Flat Press Cure Process parameters
And pressing and molding the middle parts of the air bag and the sealed capsule on the sealed capsule molding equipment to obtain the finished sealed capsule.
In the exemplary embodiment, the extrusion temperature may be 30 to 60 ℃, the extrusion speed of the sealing rubber may be 4 to 6 minutes/meter, and the extrusion pressure may be 4 to 6 Mpa. The balloon tests may include a natural state thickness test, a thickness test after inflation under bare pressure, and a seal test, see table 4 below for details.
TABLE 4 air bag test contents
In addition, the preparation method of the sealing rubber can comprise the following steps:
s1: adding 80-120 parts by mass of Ethylene Propylene Diene Monomer (EPDM) into an internal rubber mixing mill for plastication or thermal mixing to obtain a main material. For example, the ethylene propylene diene monomer may be 85, 96, 102, 115 parts. Here, the EPDM rubber has excellent properties of ozone resistance, heat resistance, chemical resistance and the like because the main chain is composed of chemically stable saturated hydrocarbons and contains only unsaturated double bonds in the side chains, and can be used as a main raw material for preparing sealing rubber.
S2: and continuously adding 10-30 parts of activator, 30-60 parts of reinforcing agent, 30-60 parts of softening agent and 30-90 parts of anti-radiation filler into the closed rubber mixing mill, and carrying out primary mixing and uniform dispersion to obtain the coarse material. For example, the active agent is added in the amount of 10.4, 23.6 and 29.0 parts; the addition amount of the reinforcing agent is 34.6, 55.6 and 59.0 parts; the addition amount of the softener is 34.6 parts, 55.6 parts and 59.0 parts; the dosage of the radiation-resistant filler is 32.2, 43.6, 60.4, 74.5, 87.1 and 88.7 parts. And carrying out sheet discharging and parking on the large materials for 24 hours.
S3: and adding 3-15 parts of accelerator, 0.5-2 parts of vulcanizing agent and the large material into an open rubber mixing mill for secondary mixing and uniformly dispersing to obtain the sealing rubber.
In this embodiment, the activator component includes zinc oxide, stearic acid, and a silane coupling agent. In the activating agent, the mass ratio of zinc oxide is 30-50%, the mass ratio of stearic acid is 3-10%, and the mass ratio of silane coupling agent is 30-50%. The zinc oxide reacts with the accelerator in the EPDM matrix to generate a complex, further promotes the decomposition of the vulcanizing agent, and reacts with unsaturated double bonds of EPDM side chains to generate a three-dimensional network structure, so that the rubber is endowed with excellent service performance, the vulcanization time is shortened, and the rubber is energy-saving and environment-friendly. Stearic acid can activate the surface of zinc oxide, more accelerator reacts with zinc oxide, and the above decomposition and reaction processes are repeated. For example, the active agent may include, in parts by mass: 5-10 parts of silane coupling agent, such as 6.4, 7.0, 8.6 and 9.3 parts; 5-10 parts of zinc oxide, such as 6.4, 7.0, 8.6 and 9.3 parts; 1-3 parts of stearic acid, such as 1.5, 1.9, 2.2 and 2.8 parts.
In this embodiment, the reinforcing agent may be highly abrasion resistant carbon black. Here, EPDM is a non-self-reinforcing rubber, which has low strength, and needs to be reinforced with carbon black to improve its mechanical properties. The high wear-resistant furnace black N330 with small particle size, high oil absorption and iodine absorption values and large specific surface area is selected as the reinforcing agent, so that the EPDM (ethylene-propylene-diene monomer) can be endowed with excellent mechanical property and can resist the physical damage of the flexible sealing material caused in the stretching or compressing process.
In this embodiment, the softener may be paraffin oil. Here, the refined 500# paraffin oil becomes chain saturated aliphatic hydrocarbon, has high kinematic viscosity and excellent compatibility with EPDM, and does not precipitate on the surface of the flexible sealing material to influence the use performance of the material. Secondly, it can lubricate during processing and improve the dispersivity of N330 in EPDM.
In this embodiment, the vulcanizing agent may be sulfur. For example, the vulcanizing agent can be barium sulfate, and the adding content is 10-30 parts. For example, 12, 15, 18 parts.
In this embodiment, the temperature of the plastication or mastication in step S1 is 120 to 140 ℃, for example, 123, 134, 137 ℃; the time is 3-5 min, such as 3.2, 4.2 and 4.7 min; the pressure is 0.3 to 1.0MPa, for example, 0.36, 0.47, 0.68, 0.92 MPa. The temperature of the first mixing and the second mixing is 130-150 ℃, such as 134, 145 and 147 ℃; the time is 8-25 min, such as 9.6, 14.2, 16.0 and 23.5 min. The pressure is 0.3-1.0 MPa, such as 0.36, 0.47, 0.68, 0.92 MPa.
In this embodiment, the radiation resistant filler component includes bismuth trioxide, barium sulfate, and gadolinium trioxide. The radiation-resistant filler comprises the following components in parts by weight: 10-30 parts of bismuth trioxide, 10-30 parts of gadolinium trioxide and 10-30 parts of barium sulfate. Here, the conventional X-ray shielding material is mainly lead, but on one hand, lead is highly toxic, and on the other hand, element Bi has a mass attenuation coefficient nearly identical to that of Pb, that is, Bi has an X-ray shielding function equivalent to that of Pb. Therefore, Bi is selected for use in the present application2O3As a substitute functional material of PbO, the toxicity of X-ray shielding materials is avoided. Barite is a nonmetallic mineral with barium sulfate as the main component, has stable chemical property, and is easy to absorb X rays and gamma rays. And the barite is a natural mineral, the reserves are very abundant, can obtain the high-purity product after purifying, the processing technology is simple, with low costs, pollute little. The traditional elements for absorbing thermal neutrons include boron, lithium, cadmium, rare earth and the like, wherein gadolinium contained in the rare earth has the highest thermal neutron capture cross section, and a gadolinium-containing polymer is an ideal neutron shielding material. Wherein, in the anti-radiation filler, the mass ratio of the bismuth trioxide is 20-50%, the mass ratio of the nano barite is 20-50%, and the mass ratio of the rare earth gadolinium oxide is 20-50%.
In the embodiment, in the accelerant, the mass ratio of TBZTD is 20-35%, the mass ratio of CZ is 20-35%, the mass ratio of DM is 10-20%, the mass ratio of DTDC is 10-20%, and the mass ratio of BZ is 10-20%.
Wherein, the mass parts of the components of the accelerant in each hundred parts of the rubber matrix are as follows: TBZTD 1-3 parts, such as 1.2, 2.4, 2.7 parts; 1-3 parts of CZ, such as 1.2, 2.4 and 2.7 parts; DM 0.5-2 parts, such as 0.5, 1.3, 1.9 parts; 0.5-2 parts of DTDC, such as 0.5, 1.3 and 1.9 parts; 0.5-2 parts of BZ, such as 0.5, 1.3 and 1.9 parts.
In this embodiment, the step of mixing and uniformly dispersing in S2 includes the following steps:
s21: mixing and uniformly dispersing a silane coupling agent, zinc oxide, stearic acid and a main material, wherein the mixing and dispersing temperature is 130-150 ℃ in S21, such as 132 ℃, 146 ℃ and 148 ℃; the time is 2-5 min, such as 2.4, 4.5 and 5.0 min; the pressure is 0.6 to 1.0MPa, for example, 0.7MPa, 0.8MPa, 0.9 MPa. S21, mixing and uniformly dispersing the main material and the activator, which is helpful for activating the formula vulcanization system and increasing the network density of rubber molecules; s22: mixing and uniformly dispersing paraffin oil, high abrasion furnace carbon black and a product of S21, wherein the mixing and dispersing temperature is 130-150 ℃ in S22, such as 132, 146 and 148 ℃; the time is 6-10 min, such as 6.3, 8.2 and 9.5 min; the pressure is 0.6-1.0 MPa, such as 0.7MPa, 0.8MPa, 0.9 MPa; s23: the filler and the product of S22 were kneaded and uniformly dispersed to obtain a large material. In S23, the mixing and dispersing temperature is 130-150 ℃, such as 132, 146 and 148 ℃; the time is 6-10 min, such as 6.3, 8.2 and 9.5 min; the pressure is 0.6-1.0 MPa, such as 0.7MPa, 0.8MPa, 0.9 MPa.
In this embodiment, the large material blanking time of S2 is 23-25 h, for example, 23.5 h, 24h, and 24.5 h. After the large material is placed in a blanking mode, the large material is heated, and the materials are added and mixed conveniently. When the large materials and the accelerator are mixed and uniformly dispersed to obtain the mixed rubber, the mixed rubber is refined, the dispersion uniformity between the rubber and the compounding agent is increased, and the performance effect of the material is improved.
In this embodiment, in S1 and S2, an internal rubber mixer may be used to respectively heat or plasticate the epdm rubber; the main material is mixed and uniformly dispersed. In S3, an open type rubber mixing machine can be adopted to mix the big materials, namely, the big materials are uniformly dispersed; after the rubber compound is obtained, the rubber compound can be refined by an open rubber mixing mill.
Through tests, the hardness of the sealing rubber is 55-60, the strength is not less than 12, and the elongation is not less than 500.
TABLE 5 test results of sealing rubber Properties
In summary, the beneficial effects of the utility model can include at least one of the following:
(1) the sealed capsule prepared by the utility model has the characteristics of high resilience and air inflation, stability, durability, easy installation and the like;
(2) the arc-shaped section in the sealed air bag is stably pressed under the extrusion of an internal medium, the D-shaped structure is locally thick, the linear expansion of the inflatable structure along the central position is realized, the inflatable structure is attached to the pipe wall, the triangular supporting structure is kept under the pressure of the external medium, and the sealing performance is improved;
(3) the utility model adopts the extrusion preforming process to ensure the stability of the wall thickness of the air bag, simultaneously adjusts the mould pressing process, adopts the long-section preforming continuous mould pressing forming to ensure that the linear expansion of the air bag is consistent, thereby improving the stability of the air bag and prolonging the service life.
Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (10)
1. A continuous production apparatus for sealed capsules, characterized by comprising an air bag preforming device, an air bag pressing detection device and a sealed capsule charging and pressing device, wherein,
the air bag preforming device comprises an extrusion feeding unit, a vulcanization conveying unit, a constant-temperature cooling unit and a conveying fixed-length cutting unit which are sequentially connected, wherein the extrusion feeding unit can extrude and feed production raw materials of sealing rubber or the sealing rubber to the vulcanization conveying unit, the vulcanization conveying unit can vulcanize the sealing rubber, the constant-temperature cooling unit can cool the vulcanized sealing rubber, and the conveying fixed-length cutting unit can cut the cooled sealing rubber to obtain an annular air bag part and an air bag preforming product main body part of an air bag preforming product;
the air bag pressing detection equipment comprises a flat plate die pressing vulcanization unit and an air bag sealing detection unit, wherein the flat plate die pressing vulcanization unit can press the annular air bag part of the air bag preformed product and the main body part of the air bag preformed product to form a complete air bag, and the air bag sealing detection unit can detect the sealing performance of the air bag;
the sealed capsule forming equipment can be used for pressing and forming the middle parts of the air bag and the sealed capsule to obtain a finished sealed capsule.
2. A continuous sealed capsule production apparatus according to claim 1, further comprising a sealed capsule inspection device capable of inspecting the sealing properties of the finished sealed capsules.
3. The continuous production apparatus of sealed capsules according to claim 1, wherein said side wall of the bladder, to which the tube wall is attached, is provided with two or more D-shaped annular bladders, which are capable of linearly inflating the bladder along the center position, to be attached to the tube wall and maintain a triangular support structure under the external medium pressure, thereby improving the sealing performance.
4. The continuous production apparatus of sealed capsules according to claim 1, wherein the sealing performance test of the sealed capsules comprises an irradiation test, a long-term airtightness test and an aging performance test.
5. The continuous production apparatus for a sealed capsule according to claim 1, wherein the sealing rubber comprises 80 to 120 parts by mass of ethylene propylene diene monomer, 10 to 30 parts by mass of an active agent, 30 to 60 parts by mass of a reinforcing agent, 30 to 60 parts by mass of a softening agent, 30 to 90 parts by mass of a radiation-resistant filler, 3 to 15 parts by mass of an accelerator, and 0.5 to 2 parts by mass of a vulcanizing agent.
6. The continuous production apparatus for sealed capsules according to claim 5, wherein the active agent comprises 5 to 10 parts by mass of zinc oxide, 1 to 3 parts by mass of stearic acid, and 5 to 10 parts by mass of a silane coupling agent.
7. The continuous production apparatus for a sealed capsule according to claim 5, wherein the radioresistant filler comprises, by mass, 10 to 30 parts of bismuth trioxide, 10 to 30 parts of nano-barite, and 10 to 30 parts of gadolinium oxide, which is a rare earth.
8. The continuous production apparatus for sealed capsules according to claim 5, wherein the accelerator comprises 10 to 30 parts by mass of TBZTD, 10 to 30 parts by mass of CZ, 10 to 30 parts by mass of DM, 10 to 30 parts by mass of DTDC, and 10 to 30 parts by mass of BZ.
9. A continuous process for the production of sealed capsules, wherein the continuous process is carried out by a continuous production apparatus for sealed capsules according to any one of claims 1 to 8, and the continuous process comprises the steps of:
adding a sealing rubber raw material or sealing rubber into air bag preforming equipment according to a preset addition amount, and controlling the extrusion temperature and the extrusion speed to obtain an annular air bag part of an air bag preforming product and a main body part of the air bag preforming product;
placing the annular air bag part of the air bag preformed product and the main body part of the air bag preformed product into air bag pressing detection equipment for vulcanization and pressing to form an air bag, and detecting the air bag;
and pressing and molding the middle parts of the air bag and the sealed capsule on the sealed capsule molding equipment to obtain the finished sealed capsule.
10. The continuous process for producing a sealed capsule according to claim 9, wherein the extrusion temperature is 30 to 60 ℃, the extrusion speed of the sealing rubber is 4 to 6 minutes/meter, and the extrusion pressure is 4 to 6 Mpa;
the air bag detection comprises natural state thickness detection, thickness detection after inflation under bare pressure and sealing performance detection.
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