CN113232182A - Preparation process and preparation equipment of ultralow-temperature retraction sealing material - Google Patents

Preparation process and preparation equipment of ultralow-temperature retraction sealing material Download PDF

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Publication number
CN113232182A
CN113232182A CN202110505878.0A CN202110505878A CN113232182A CN 113232182 A CN113232182 A CN 113232182A CN 202110505878 A CN202110505878 A CN 202110505878A CN 113232182 A CN113232182 A CN 113232182A
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channel
feeding
valve
bin
communicated
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Chinese (zh)
Inventor
黄春方
阮恩毅
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Zhejiang Blons Rubber And Plastic Technology Co ltd
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Zhejiang Blons Rubber And Plastic Technology Co ltd
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Priority to CN202110505878.0A priority Critical patent/CN113232182A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
    • B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
    • B29B7/18—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/183—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft having a casing closely surrounding the rotors, e.g. of Banbury type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/002—Methods
    • B29B7/005—Methods for mixing in batches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/002—Methods
    • B29B7/007—Methods for continuous mixing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/04—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with non-movable mixing or kneading devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
    • B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
    • B29B7/18—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/22—Component parts, details or accessories; Auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/22—Component parts, details or accessories; Auxiliary operations
    • B29B7/24—Component parts, details or accessories; Auxiliary operations for feeding
    • B29B7/242—Component parts, details or accessories; Auxiliary operations for feeding in measured doses
    • B29B7/244—Component parts, details or accessories; Auxiliary operations for feeding in measured doses of several materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/22—Component parts, details or accessories; Auxiliary operations
    • B29B7/24—Component parts, details or accessories; Auxiliary operations for feeding
    • B29B7/246—Component parts, details or accessories; Auxiliary operations for feeding in mixers having more than one rotor and a casing closely surrounding the rotors, e.g. with feeding plungers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/22—Component parts, details or accessories; Auxiliary operations
    • B29B7/26—Component parts, details or accessories; Auxiliary operations for discharging, e.g. doors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/58—Component parts, details or accessories; Auxiliary operations
    • B29B7/582—Component parts, details or accessories; Auxiliary operations for discharging, e.g. doors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7461—Combinations of dissimilar mixers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7476—Systems, i.e. flow charts or diagrams; Plants
    • B29B7/7485—Systems, i.e. flow charts or diagrams; Plants with consecutive mixers, e.g. with premixing some of the components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7476—Systems, i.e. flow charts or diagrams; Plants
    • B29B7/7495—Systems, i.e. flow charts or diagrams; Plants for mixing rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/82—Heating or cooling
    • B29B7/826—Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/84—Venting or degassing ; Removing liquids, e.g. by evaporating components
    • B29B7/845—Venting, degassing or removing evaporated components in devices with rotary stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/86—Component parts, details or accessories; Auxiliary operations for working at sub- or superatmospheric pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/88—Adding charges, i.e. additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/88—Adding charges, i.e. additives
    • B29B7/94—Liquid charges
    • 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
    • C08K2003/2296—Oxides; Hydroxides of metals of zinc

Abstract

The invention discloses a preparation process and preparation equipment of an ultralow low-temperature retraction sealing material, the sealing material prepared by the process and the equipment can resist ultralow low-temperature retraction, the low-temperature retraction TR10(GB/T7758-2002) reaches below-55 ℃, the molding quality is high, and the key points of the technical scheme are as follows: the components comprise the following components in parts by weight: 100 parts of EPDM raw rubber; carbon black N55030-50 shares; 8-12 parts of a heat-resistant agent; 2-5 parts of an anti-aging agent; 4-6 parts of vulcanizing agent DCP; 1-3 parts of a crosslinking agent; 6-8 parts of zinc oxide; 1-2 parts of stearic acid; 15-25 parts of paraffin oil; banburying: adding EPDM raw rubber into an internal mixer for plasticating, then adding carbon black, adding an anti-aging agent and a plasticizer, and then adding a heat-resistant agent, zinc oxide, stearic acid and paraffin oil, wherein the internal mixing temperature is lower than 130 ℃; after banburying, feeding the mixture into an open mill; adding a vulcanizing agent and an accelerator in the open milling process, adjusting the roll temperature to be 40-50 ℃, adjusting the roll spacing to be 2-3mm, carrying out thin pass for 3 times, carrying out open milling for 8 minutes, and then discharging.

Description

Preparation process and preparation equipment of ultralow-temperature retraction sealing material
Technical Field
The invention belongs to the technical field of preparation of sealing materials, and particularly relates to a preparation process and preparation equipment of an ultralow-temperature retraction sealing material.
Background
At present, the power grid transformation is the most important thing in the vigorous development of new capital construction, and the severe outdoor environment is the key for examining the product quality, such as the ultralow temperature environment, the extreme minimum temperature record of-52.3 ℃ in the existing meteorological data of China is born in 2-13 th desert river in 1969, and the method becomes a hard condition for judging whether the sealing material can maintain the performance in the ultralow temperature environment.
The EPDM rubber has good chemical stability, excellent compression and deformation resistance and compression stress relaxation resistance, and higher elasticity and aging resistance, so that the EPDM rubber is suitable for preparing sealing materials, but the existing EPDM rubber is generally used at a temperature of about-45-150 ℃, so that the EPDM rubber is poor in applicability in an ultralow-temperature environment, and the preparation process of the EPDM rubber needs to be improved; in addition, a plurality of specific amounts of main materials or auxiliary materials are required to be added in a specific time in the preparation process, so that the rubber is uniformly mixed and the mixing ratio is accurate, which is the premise of producing high-quality products.
Disclosure of Invention
The invention aims to provide a preparation process and preparation equipment of an ultralow-temperature retraction sealing material.
The purpose of the invention is realized as follows: a preparation process of an ultralow-temperature retraction sealing material comprises the following steps:
preparing raw materials: the components comprise the following components in parts by weight: 100 parts of EPDM raw rubber; carbon black N55030-50 shares; 8-12 parts of a heat-resistant agent; 2-5 parts of an anti-aging agent; 4-6 parts of vulcanizing agent DCP; 1-3 parts of a crosslinking agent; 6-8 parts of zinc oxide; 1-2 parts of stearic acid; 15-25 parts of paraffin oil;
banburying: adding EPDM raw rubber into an internal mixer for plasticating for 2 minutes, then adding carbon black for plasticating for 2 minutes, then adding an anti-aging agent and a plasticizer for banburying for 6 minutes, then adding a heat-resistant agent, zinc oxide, stearic acid and paraffin oil for banburying for 3 minutes, wherein the banburying temperature is lower than 130 ℃; feeding the rubber material into an open mill after banburying;
open mixing: adding a vulcanizing agent and an accelerant in the open milling process, adjusting the roll temperature to be 40-50 ℃, adjusting the roll spacing to be 2-3mm, thinly passing for 3 times, carrying out open milling for 8 minutes, and then discharging the sheet.
The invention is further configured to: the anti-aging agent adopts anti-aging agent SP-C and anti-aging agent 2246, and the anti-aging agent SP-C and the anti-aging agent 2246 are added according to the weight part ratio of 1: 1.
An internal mixer in the internal mixing step comprises an internal mixing chamber, an automatic feeding device and a vacuum adsorption device, wherein a screw rod is arranged in the internal mixing chamber, a feeding cavity and an upper top bolt assembly are arranged at the top of the internal mixing chamber, the upper top comprises two first oil cylinders arranged above the internal mixing chamber, piston rods of the two first oil cylinders are connected through a cross beam, a second oil cylinder is arranged on the cross beam, and the lower end of a piston rod of the second oil cylinder is connected with a weight;
the automatic feeding device comprises a main material feeding bin, a powder auxiliary material feeding bin and a liquid auxiliary material feeding bin, wherein the main material feeding bin, powder auxiliary material delivery bin and liquid auxiliary material delivery bin respectively with throw the material chamber intercommunication, powder auxiliary material delivery bin is the multiunit, every group powder auxiliary material delivery bin all includes the storage silo, ejection of compact conveying screw and the storehouse of weighing, ejection of compact conveying screw's feed end and the bottom intercommunication of storage silo, ejection of compact screw's discharge end and the top intercommunication of the storehouse of weighing, the storehouse bottom exit end of weighing on every group powder auxiliary material delivery bin is connected with transfer passage jointly, transfer passage's one serves and is equipped with mixing bunker and the feeding conveying screw that has connected gradually, be connected with first gas blowing pipe on transfer passage's the other end, feeding conveying screw's discharge end and throw the material chamber intercommunication, the last valve module that corresponds and is used for controlling to open and close that still is equipped with the exit end with every group storehouse of weighing of conveying passage.
The invention is further configured to: the conveying channel comprises a plurality of feeding pipelines communicated with the outlet end at the bottom of the weighing bin, the conveying channel is also provided with mounting pipelines symmetrically arranged with the feeding pipelines, a plurality of groups of flow guide structures are also arranged in the conveying channel, each flow guide structure comprises a first flow guide part positioned at the upper part of the inner wall of the conveying channel and a second flow guide part positioned at the lower part of the inner wall of the conveying channel, a flow guide channel is formed between the first flow guide part and the second flow guide part of the same group of flow guide structures, and the first flow guide part and the second flow guide part of two adjacent groups of flow guide structures form a material storage channel;
the valve assembly comprises a sealing block and a connecting rod which are connected, the sealing block is positioned in the conveying channel, the connecting rod penetrates through the installation pipeline, and the valve assembly further comprises an electromagnetic assembly and a return spring which are used for driving the connecting rod to lift;
the second flow guide part comprises a windward wall, a sealing wall and a leeward wall which are sequentially connected, the windward wall and the leeward wall are obliquely arranged, and the sealing block comprises a first sealing surface, a second sealing surface and a third sealing surface, wherein the first sealing surface is used for radially abutting against the sealing wall, the second sealing surface is used for axially abutting against the first flow guide part, and the third sealing surface is used for sealing and installing a pipeline and is obliquely arranged;
when any group of valve components is opened, powder materials in the corresponding weighing bin enter the material storage channel along the third sealing surface, and the flow guide channel is sealed by the first sealing surface and the second sealing surface; when all the valve assemblies are closed, all the first sealing surfaces are separated from the sealing walls, and the flow guide channels are communicated.
The invention is further configured to: the powder material weighing device is characterized in that a valve port channel for powder material to pass through is arranged in the weighing bin, a control valve core for controlling the opening and closing of the valve port channel is arranged in the valve port channel, the control valve core comprises a turnover valve core and a turnover motor, the turnover valve core comprises a valve rod and a valve block arranged on the valve rod, the valve rod radially penetrates through the valve port channel, the turnover motor is arranged on the outer side of the valve port channel and drives the valve rod to rotate, a weighing plate is arranged on the valve block, and a gravity sensor is further arranged on the weighing plate.
The invention is further configured to: the mixing bin comprises an air inlet channel, a mixing cavity and a discharge channel, the mixing cavity comprises an upper conical cavity and a lower conical cavity which are communicated, the inner diameter of the large end of the upper conical cavity is equal to that of the large end of the lower conical cavity and is butted with the inner diameter of the large end of the upper conical cavity, the small end of the upper conical cavity is butted with the air inlet channel, the large end of the lower conical cavity is butted with the discharge channel, a material blocking rod is arranged in the discharge channel, an arc-shaped flow guide part which is right opposite to the air inlet channel is arranged on the material blocking rod, the taper of the lower conical cavity is larger than that of the upper conical cavity, the discharge end of the conveying channel is positioned in the air inlet channel, and a second air blowing pipe which is tangentially communicated with the air inlet channel is also arranged on the mixing bin; the blending bunker still includes the temporary storage bin with discharging channel intercommunication, and is equipped with the gas vent on the temporary storage bin, is equipped with the filter screen on the gas vent, is connected through being equipped with the butterfly valve between the bottom in temporary storage bin and the feed end of feeding conveyor screw.
The invention is further configured to: the vacuum adsorption device comprises an exhaust tube, a negative pressure pipeline, a collecting box and a vacuum pump, wherein the negative pressure pipeline comprises an upper pipeline, a necking channel and a lower pipeline which are sequentially communicated, the upper pipeline is communicated with the vacuum pump, the lower pipeline is communicated with the collecting box, a filter bag and a flow sensor are arranged in the upper pipeline, the port of the upper pipeline is communicated with the vacuum pump, an opening and closing valve is arranged between the lower pipeline and the collecting box, one end of the exhaust tube is communicated with the middle section of the feeding cavity, and the other end of the exhaust tube is radially communicated with the necking channel;
the feeding cavity comprises a main material feeding port communicated with the main material feeding bin, a powder auxiliary material feeding port communicated with the feeding conveying screw rod and a liquid auxiliary material feeding port communicated with the liquid auxiliary material feeding bin, the main material feeding port, the powder auxiliary material feeding port and the liquid auxiliary material feeding port are all positioned below the pipe orifice of the exhaust pipe, an air inlet channel is further arranged at the top of the feeding cavity, an air guide channel is further arranged in the feeding conveying screw rod, and the two ends of the air guide channel are communicated with the feeding end and the discharging end of the feeding conveying screw rod;
a ventilation flow channel is also arranged on the inner wall of the feeding cavity, one end of the ventilation flow channel extends into the mixing chamber, and the other end of the ventilation flow channel extends to the middle section of the feeding cavity; when the pressure weight rises to the top end of the feeding cavity, the pressure weight is in abutting seal with the air inlet channel, and the exhaust pipe is communicated with the feeding cavity; when the weight is positioned in the middle section of the feeding cavity, the weight is in abutting seal with the mouth of the exhaust pipe; when the weight is positioned at the lower section of the feeding cavity, the weight is in contact seal with the feeding port of the powder auxiliary material, and the banburying chamber is communicated with the exhaust pipe through a ventilation flow passage.
The invention is further configured to: the internal mixer further comprises a pneumatic control unit, the pneumatic control unit comprises a booster pump, a high-pressure tank and a vacuum tank, the vacuum pump is communicated with the vacuum tank, a first switch valve is further arranged between the vacuum pump and the vacuum tank, the booster pump is communicated with the high-pressure tank, a second switch valve is further arranged between the booster pump and the high-pressure tank, the vacuum tank is communicated with the collecting tank through a first control valve, the vacuum tank is communicated with the negative pressure pipeline through a second control valve, the high-pressure tank is communicated with the negative pressure pipeline through a third control valve, the high-pressure tank is communicated with the first air blowing pipe through a fourth control valve, and the high-pressure tank is communicated with the second air blowing pipe through a fifth control valve.
The invention is further configured to: the preparation equipment is controlled by a PLC control unit, pressure sensors are arranged in the collecting tank, the vacuum tank and the high-pressure tank, and the internal mixer comprises the following steps in the using process:
before banburying:
the weight is positioned at the highest position, the second control valve is opened, and the mixing chamber is pumped through the negative pressure channel; putting the main material into a main material delivery bin, putting each powder auxiliary material into a powder auxiliary material delivery bin, and putting the liquid auxiliary material into a liquid auxiliary material delivery bin;
in the banburying process:
the weight descends to the lowest position, the discharge end of the feeding conveying screw is in a closed state, and the negative pressure pipe performs air extraction on the mixing chamber through the ventilation flow channel;
meanwhile, a discharging conveying screw corresponding to the powder auxiliary material delivery bin is started, powder is delivered into the weighing bin, a gravity sensor feeds a detection signal back to the control unit, when the detected numerical value is equal to a preset value, the discharging conveying screw is paused, and the overturning motor drives a valve rod to rotate, so that the powder material falls to the bottom of the weighing bin; the PLC control unit opens the corresponding valve components according to the preset adding sequence of the auxiliary materials, and the powder materials enter the conveying channel; when all valve components are closed, the interior of the conveying channel is communicated, and the powder material enters the temporary storage bin through the mixing bin;
when auxiliary materials need to be added, the weight is in the middle position, and the exhaust pipe is in a closed state; then the butterfly valve is opened, the feeding conveying screw rod is started, and the materials in the temporary storage bin are conveyed into the banburying chamber.
The invention is further configured to: in the banburying process, when the weight is at the lowest position, the control method of the vacuum adsorption device further comprises the following steps:
l1, detecting the instantaneous gas flow by the first flow sensor, and entering the step L2 when the instantaneous gas flow detected by the first flow sensor is lower than the preset flow value;
l2, closing the second control valve, opening the third control valve, opening the opening and closing valve, detecting the pressure value in the collecting box, and entering the step L3 when the pressure value reaches a preset pressure value;
l3, the third control valve is closed, the open/close valve is closed, the second control valve is opened, and the process returns to step L1.
By adopting the technical scheme, the method has the following advantages:
the preparation process adopts a vulcanizing system of vulcanizing agent DCP + cross-linking agent, and can achieve EPDM with ultra-high crosslinking degree through fixed proportion and preparation process, so that the low-temperature resistance of the EPDM is greatly improved, and the low-temperature retraction TR10 (GB/T7758-;
the internal mixer adopts the automatic feeding device, so that the weighing and timing feeding can be realized, the manual error rate is reduced, the metering is more accurate, the final forming quality of the product can be improved, and the production efficiency is higher;
the automatic feeding device can carry out single-type selective addition or multiple-type common selective addition on auxiliary materials through the arrangement of the conveying channel, and the automation degree is high;
by adopting the arrangement of the vacuum adsorption device, the dust can be prevented from overflowing, and the health degree of the working environment is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic cross-sectional view taken at K-K of FIG. 1 according to the present invention;
FIG. 3 is a schematic view of the weighing compartment of the present invention;
FIG. 4 is an enlarged view of portion A of FIG. 1 according to the present invention;
FIG. 5 is an enlarged view of the portion B of FIG. 3 according to the present invention;
FIG. 6 is a schematic structural view of a mixing silo in the present invention;
FIG. 7 is a schematic view showing the structure of a vacuum adsorption apparatus according to the present invention;
fig. 8 is a block diagram showing the construction of the pneumatic control unit in the present invention.
The reference numbers in the figures are: 1. an internal mixing chamber; 2. a feeding cavity; 3. a first cylinder; 4. a second cylinder; 5. pressing; 6. a storage bin; 7. a discharge conveying screw; 8. a weighing bin; 9. a delivery channel; 10. a mixing bin; 11. a feed conveyor screw; 12. a first air blowing pipe; 13. a feed conduit; 14. a first flow guide part; 15. a second flow guide part; 16. a flow guide channel; 17. a material storage channel; 18. a sealing block; 19. a connecting rod; 20. an electromagnetic assembly; 21. a return spring; 22. a windward wall; 23. a sealing wall; 24. a leeward wall; 26. a valve stem; 27. a valve plate; 28. a weighing plate; 29. a gravity sensor; 30. an air inlet channel; 31. a discharge channel; 32. an upper tapered cavity; 33. a lower tapered cavity; 34. a material blocking rod; 35. a second gas blow pipe; 36. temporarily storing in a bin; 37. an exhaust port; 38. a butterfly valve; 40. an air exhaust pipe; 41. a negative pressure pipeline; 42. a collection box; 43. a necking channel; 44. a filter bag; 45. a flow sensor; 46. opening and closing a valve; 47. a main material feeding port; 48. a liquid auxiliary material feeding port; 49. an air intake passage; 50. an air guide channel; 51. a ventilation flow channel; 52. a first sealing surface; 53. a second sealing surface; 54. a third sealing surface.
Detailed Description
The invention is further described in the following with specific embodiments in conjunction with the accompanying drawings, see fig. 1-8:
a preparation process of an ultralow-temperature retraction sealing material is characterized by comprising the following steps: the method comprises the following steps:
preparing raw materials: the components comprise the following components in parts by weight: 100 parts of EPDM raw rubber; carbon black N55030-50 shares; 8-12 parts of a heat-resistant agent; 2-5 parts of an anti-aging agent; 4-6 parts of vulcanizing agent DCP; 1-3 parts of a crosslinking agent; 6-8 parts of zinc oxide; 1-2 parts of stearic acid; 15-25 parts of paraffin oil;
banburying: adding EPDM raw rubber into an internal mixer for plasticating for 2 minutes, then adding carbon black for plasticating for 2 minutes, then adding an anti-aging agent and a plasticizer for banburying for 6 minutes, then adding a heat-resistant agent, zinc oxide, stearic acid, paraffin oil and a crosslinking agent for banburying for 3 minutes, wherein the banburying temperature is lower than 130 ℃; feeding the rubber material into an open mill after banburying;
open mixing: adding a vulcanizing agent and an accelerant in the open milling process, adjusting the roll temperature to be 40-50 ℃, adjusting the roll spacing to be 2-3mm, thinly passing for 3 times, carrying out open milling for 8 minutes, and then discharging the sheet.
The anti-aging agent adopts anti-aging agent SP-C and anti-aging agent 2246, and the anti-aging agent SP-C and the anti-aging agent 2246 are added according to the weight part ratio of 1: 1.
The preparation process adopts a vulcanizing system of vulcanizing agent DCP + cross-linking agent, and through a fixed proportion and preparation process, the EPDM with ultrahigh crosslinking degree can be achieved, so that the low-temperature resistance of the EPDM is greatly improved.
According to the preparation process, the following formula materials are prepared according to different raw material parts:
material one: the components comprise the following components in parts by weight: 100 parts of EPDM raw rubber; carbon black N55040 parts; 10 parts of a heat-resistant agent; 1.5 parts of an anti-aging agent; 5 parts of vulcanizing agent DCP; 2 parts of a crosslinking agent; 5 parts of zinc oxide; 1 part of stearic acid; 20 parts of paraffin oil;
material II: the components comprise the following components in parts by weight: 100 parts of EPDM raw rubber; carbon black N55030 parts; 8 parts of a heat-resistant agent; 2 parts of an anti-aging agent; 4 parts of vulcanizing agent DCP; 1 part of a crosslinking agent; 6 parts of zinc oxide; 1 part of stearic acid; 15 parts of paraffin oil;
material three: the components comprise the following components in parts by weight: 100 parts of EPDM raw rubber; carbon black N55050 parts; 12 parts of a heat-resistant agent; 5 parts of an anti-aging agent; 6 parts of vulcanizing agent DCP; 3 parts of a crosslinking agent; 8 parts of zinc oxide; 2 parts of stearic acid; 25 parts of paraffin oil;
and performing a low-temperature retraction TR10(GB/T7758-2002) test on the 3 materials, wherein the first material reaches-60 ℃; the second material reaches-56 ℃; the third material reaches-57 ℃, so the developed material can reach the low-temperature retraction TR10(GB/T7758-2002) below-55 ℃, and the first material is the best mixture ratio.
An internal mixer in the internal mixing step comprises an internal mixing chamber 1, an automatic feeding device and a vacuum adsorption device, wherein a screw is arranged in the internal mixing chamber 1, a feeding cavity 2 and an upper top bolt assembly are arranged at the top of the internal mixing chamber 1, the upper top comprises two first oil cylinders 3 arranged above the internal mixing chamber 1, piston rods of the two first oil cylinders 3 are connected through a cross beam, a second oil cylinder 4 is arranged on the cross beam, and the lower end of a piston rod of the second oil cylinder 4 is connected with a weight 5;
the first oil cylinder 3 and the second oil cylinder 4 can be controlled by a PLC control unit and are used for driving the weight 5 to lift; the automatic feeding device is used for automatically feeding powder auxiliary materials in a timed and quantitative manner, so that the control precision is improved, and the banburying effect is improved; the vacuum adsorption device is mainly used for exhausting air to the banburying chamber 1, and dust or harmful gas generated in banburying is prevented from being directly discharged to a production workshop.
The automatic feeding device comprises a main material feeding bin, a powder auxiliary material feeding bin and a liquid auxiliary material feeding bin, wherein the main material feeding bin, powder auxiliary material delivery bin and liquid auxiliary material delivery bin respectively with throw material chamber 2 intercommunication, the powder auxiliary material delivery bin is the multiunit, every group powder auxiliary material delivery bin all includes storage silo 6, ejection of compact conveying screw 7 and weighing bin 8, ejection of compact conveying screw 7's feed end and storage silo 6's bottom intercommunication, ejection of compact screw's discharge end and weighing bin 8's top intercommunication, 8 bottom exit ends of weighing bin on every group powder auxiliary material delivery bin are connected with transfer passage 9 jointly, transfer passage 9 serves and is equipped with mixing bunker 10 and feeding conveying screw 11 that has connected gradually, be connected with first gas blowing pipe 12 on transfer passage 9's the other end, the discharge end and the throwing material chamber 2 intercommunication of feeding conveying screw 11, still be equipped with on transfer passage 9 and correspond with the exit end of every group weighing bin 8 and be used for the valve module that control was opened and close.
The main material delivery bin and the liquid auxiliary material delivery bin can be multiple or single and are used for respectively delivering main materials and liquid main materials, such as EPDM raw rubber and paraffin oil in the material; electric flap valves can be arranged between the main material feeding bin and the liquid auxiliary material feeding bin and between the feeding cavities 2 to control the feeding time; before banburying, each group of powder auxiliary materials or solid particle auxiliary materials are respectively put into the corresponding storage bin 6; according to a preset charging program of a PLC control unit, a single auxiliary material such as carbon black which needs to be charged firstly can be started in advance corresponding to a discharging conveying screw 7 on a carbon black powder auxiliary material feeding bin, carbon black powder is fed into a weighing bin 8, when the weighing bin 8 sees that the carbon black powder reaches a preset feeding weight, the discharging conveying screw 7 stops, then a valve assembly is opened, the carbon black falls into a conveying channel 9, and after the valve assembly is closed, the carbon black powder in the conveying channel 9 is blown into a mixing bin 10 through a first air blowing pipe 12; if multiple auxiliary materials need to be put in simultaneously, like adding age resister, plasticizer simultaneously, ejection of compact conveying screw 7 on age resister powder auxiliary material delivery storehouse and the plasticizer powder auxiliary material delivery storehouse starts simultaneously, then gets into the storehouse of weighing 8 and weighs, and after weighing completion in all areas, two valve module that correspond are opened, and the powder falls into transfer passage 9, blows to blending bunker 10 jointly through first gas blow pipe 12 at last, and the mode of blowing simultaneously can carry out multiple powder and premix.
The conveying channel 9 comprises a plurality of feeding pipelines 13 communicated with the outlet end at the bottom of the weighing bin 8, the conveying channel 9 is further provided with mounting pipelines symmetrically arranged with the feeding pipelines 13, a plurality of groups of flow guide structures are further arranged in the conveying channel 9, each flow guide structure comprises a first flow guide part 14 positioned at the upper part of the inner wall of the conveying channel 9 and a second flow guide part 15 positioned at the lower part of the inner wall of the conveying channel 9, a flow guide channel 16 is formed between the first flow guide part 14 and the second flow guide part 15 of the same group of flow guide structures, and the first flow guide part 14 and the second flow guide part 15 of two adjacent groups of flow guide structures form a material storage channel 17;
the valve assembly comprises a sealing block 18 and a connecting rod 19 which are connected, the sealing block 18 is positioned in the conveying channel 9, the connecting rod 19 penetrates through the installation pipeline, and the valve assembly further comprises an electromagnetic assembly 20 and a return spring 21 which are used for driving the connecting rod 19 to lift;
the second flow guide part 15 comprises a windward wall 22, a sealing wall 23 and a leeward wall 24 which are sequentially connected, the windward wall 22 and the leeward wall 24 are obliquely arranged, and the sealing block 18 comprises a first sealing surface 52 which is used for radially abutting against the sealing wall 23, a second sealing surface 53 which is used for axially abutting against the first flow guide part 14 and a third sealing surface 54 which is used for sealing and installing a pipeline and is obliquely arranged;
when any group of valve components is opened, powder materials in the corresponding weighing bin 8 enter the material storage channel 17 along the third sealing surface 54, and the flow guide channel 16 is sealed by the first sealing surface 52 and the second sealing surface 53; when all sets of valve assemblies are closed, all sets of first sealing surfaces 52 are separated from sealing walls 23 and the diversion passages 16 are open.
In order to facilitate the design of the conveying channel 9, the conveying channel can be of a square structure, the flow guide channel 16 and the material storage channel 17 are sequentially communicated when the valve components are not powered on, when any valve component is opened, the first sealing surface 52 is abutted against the sealing wall 23, and the second sealing surface 53 is axially abutted against the first flow guide part 14, so that the conveying channel 9 is cut off, the material in the weighing bin 8 can freely fall into the material storage channel 17, and the influence of the air flow in the conveying channel 9 on the falling of the material is avoided; in actual use, the corresponding valve components can be electrified according to the gravity sensed by the corresponding weighing bins 8, namely the larger the weighing weight is, the longer the electrifying time is, so that the materials can fall into the material storage channel 17 in sufficient time; after the valve component is powered off and reset, powder is blown into the mixing bin 10 under the influence of air flow in the conveying channel 9; the electromagnetic assembly 20 has the specific structure that the electromagnetic assembly comprises an electromagnet and an iron core, the iron core is connected with the connecting rod 19, the return spring 21 is arranged between the electromagnet and the iron core, when the electromagnet is electrified, magnetic force is generated to suck the iron core downwards, the valve assembly is opened with the feeding pipeline 13, and when the electromagnet is powered off, under the action of the return spring 21, the valve assembly is closed with the feeding pipeline 13.
The weighing device is characterized in that a valve port channel for powder materials to pass through is arranged in the weighing bin 8, a control valve core for controlling the valve port channel to be opened and closed is arranged in the valve port channel, the control valve core comprises a turnover valve core and a turnover motor, the turnover valve core comprises a valve rod 26 and a valve block 27 arranged on the valve rod 26, the valve rod 26 radially penetrates through the valve port channel, the turnover motor is arranged on the outer side of the valve port channel and drives the valve rod 26 to rotate, a weighing plate 28 is arranged on the valve block 27, and a gravity sensor.
The control valve core is similar to an electric butterfly valve 38, and is characterized in that a gravity sensor 29 and a weighing plate 28 are added on a valve plate 27, the gravity sensor 29 is fixed on the valve plate 27 through a bolt and a spring, the gravity sensor 29 can also be a pressure sensor and is arranged between the valve plate 27 and the weighing plate 28, when the control valve core is used, a material falls on the weighing plate 28, the gravity sensor 29 is pressed to detect a signal and feed the signal back to a PLC control unit, and when the preset gravity is reached, a turnover motor controls a valve rod 26 to rotate by a certain angle, such as 90 degrees and 180 degrees, so that the material falls freely and enters the bottom of a weighing bin 8; through the setting of storehouse 8 of weighing, can realize the automatic weighing to the material, realize the ration and put in, and overall structure is comparatively simple, and is with low costs.
The mixing bin 10 comprises an air inlet channel 30, a mixing cavity and a discharge channel 31, the mixing cavity comprises an upper conical cavity 32 and a lower conical cavity 33 which are communicated, the inner diameter of the large end of the upper conical cavity 32 is equal to the inner diameter of the large end of the lower conical cavity 33 and is butted with the large end of the upper conical cavity, the small end of the upper conical cavity 32 is butted with the air inlet channel 30, the large end of the lower conical cavity 33 is butted with the discharge channel 31, a material blocking rod 34 is arranged in the discharge channel 31, an arc-shaped flow guide part which is right opposite to the air inlet channel 30 is arranged on the material blocking rod 34, the taper of the lower conical cavity 33 is larger than that of the upper conical cavity 32, the discharge end of the conveying channel 9 is positioned in the air inlet channel 30, and a second pipe 35 which is tangentially communicated with the air inlet channel 30 is also arranged on the mixing bin 10; the mixing material bin 10 further comprises a temporary storage bin 36 communicated with the discharging channel 31, an air outlet 37 is formed in the temporary storage bin 36, a filter screen is arranged on the air outlet 37, and the bottom end of the temporary storage bin 36 is connected with the feeding end of the feeding conveying screw rod 11 through a butterfly valve 38.
Because partial auxiliary materials need to be added simultaneously, the mixing bin 10 can fully mix the auxiliary materials; the second blowpipe and the air inlet channel 30 are arranged tangentially, so that the air flow can generate circumferential rotational flow after entering the air inlet channel 30, the powder air flow at the discharge end of the conveying channel 9 is axially fed, the rotational flow air flow can drive the powder air flow to generate rotational flow in the upper conical cavity 32, and in the rotational flow process, the space of the upper conical cavity 32 is gradually increased, the rotational flow air flow can play a further role in diluting and mixing the powder air flow, and the mixing uniformity is improved; in the rotational flow process, the airflow gradually enters the discharging channel 31 along with the inner wall of the lower conical cavity 33, and the speed of the airflow entering the discharging channel 31 can be reduced due to the large taper of the lower conical cavity 33, so that the powder in the airflow can be more uniformly mixed; the material blocking rod 34 can be fixed between the upper conical cavity 32 and the lower conical cavity 33 through a strip-shaped support, and the material blocking rod 34 can prevent powder airflow generated by the conveying channel 9 from directly flowing to a discharge pipeline, so that the mixing uniformity is improved; the final powder falls into a temporary storage bin 36; the exhaust port 37 is used for exhausting air, dust overflow is avoided through the arrangement of the filter screen, and when the auxiliary material input time is reached, the feeding conveying screw rod 11 and the butterfly valve 38 are opened to feed; the first air blowing pipe 12 or the second air blowing pipe 35 can be connected with a heating device to heat air flow, the heated powder can be dried, namely, the auxiliary material powder is dehumidified, and the performance of the prepared finished material is improved.
The vacuum adsorption device comprises an air exhaust pipe 40, a negative pressure pipeline 41, a collecting box 42 and a vacuum pump, wherein the negative pressure pipeline 41 comprises an upper pipeline, a necking channel 43 and a lower pipeline which are sequentially communicated, the upper pipeline is communicated with the vacuum pump, the lower pipeline is communicated with the collecting box 42, a filter bag 44 and a flow sensor 45 are arranged in the upper pipeline, the port of the upper pipeline is communicated with the vacuum pump, an opening and closing valve 46 is arranged between the lower pipeline and the collecting box 42, one end of the air exhaust pipe 40 is communicated with the middle section of the feeding cavity 2, and the other end of the air exhaust pipe 40 is radially communicated with the necking channel 43;
the vacuum adsorption device is used for automatically exhausting air from the mixing chamber 1 to prevent harmful gas and powder in the mixing chamber 1 from being directly discharged to a workshop; the filter bag 44 is used for blocking the powder in the banburying chamber 1 and preventing the powder from being drawn out, and in practical use, the conventional air purifier can be added at the tail end of the vacuum adsorption device for purification; when the weight 5 is at the lowest position, namely banburying, the flow sensor 45 is used for detecting the instantaneous flow of gas, when the instantaneous flow is too low, the filter bag 44 is possibly blocked, and the high-pressure tank can realize reverse dust removal on the filter bag 44; the collecting box 42 is in a negative pressure state, in the process of reverse dust removal, the air flow can drive the powder and the harmful gas to directly enter the collecting box 42, the upper end and the lower end of the negative pressure pipeline 41 are in equal diameter, the middle of the negative pressure pipeline is in a necking structure, a venturi tube effect is formed, in the process of reverse dust removal, suction can be formed at the position of the exhaust tube 40, and impurities of the negative pressure pipeline 41 are prevented from being blown back into the feeding cavity 2.
The feeding cavity 2 comprises a main material feeding port 47 communicated with the main material feeding bin, a powder auxiliary material feeding port communicated with the feeding conveying screw rod 11 and a liquid auxiliary material feeding port 48 communicated with the liquid auxiliary material feeding bin, the main material feeding port 47, the powder auxiliary material feeding port and the liquid auxiliary material feeding port 48 are all positioned below the pipe orifice of the air suction pipe 40, an air inlet channel 49 is further arranged at the top of the feeding cavity 2, an air guide channel 50 is further arranged in the feeding conveying screw rod 11, and two ends of the air guide channel 50 are communicated with the feeding end and the discharging end of the feeding conveying screw rod 11;
a ventilation flow channel 51 is further arranged on the inner wall of the feeding cavity 2, one end of the ventilation flow channel 51 extends into the mixing chamber 1, and the other end of the ventilation flow channel 51 extends to the middle section of the feeding cavity 2; when the weight 5 rises to the topmost end of the feeding cavity 2, the weight 5 is in abutting seal with the air inlet channel 49, the air exhaust pipe 40 is communicated with the feeding cavity 2, so that the air exhaust pipe 40 can pre-vacuumize the feeding cavity 2 before banburying, the air pressure in the feeding cavity 2 is low, and the main material powder can be prevented from overflowing along with air during feeding; when auxiliary materials need to be put in, the weight 5 is positioned in the middle section of the feeding cavity 2, the weight 5 is in abutting seal with the opening of the exhaust pipe 40, the auxiliary materials are prevented from being directly pumped away by the exhaust pipe 40 when being put in, in addition, when the butterfly valve 38 is ready to be opened, the fourth control valve and the fifth control valve are both closed in advance, and the powder is positioned in the temporary storage bin 36 at the moment, the air pressure in the banburying chamber 1 is low, the powder can directly enter the banburying chamber 1 through the air guide flow channel and can also enter the banburying chamber 1 through the rotation of the feeding conveying screw rod 11, the feeding speed is accelerated, the feeding is more complete, the powder materials are not easy to remain in the temporary storage bin 36, meanwhile, the air inlet is realized through the filter screen on the air outlet 37, and the reverse dust removal of the filter screen can also be realized; when the weight 5 is positioned at the lower section of the feeding cavity 2, indicating that the internal mixing is in progress, the weight 5 is in butt seal with the powder auxiliary material feeding port, and the internal mixing chamber 1 is communicated with the air exhaust pipe 40 through the ventilation flow passage 51, so that the continuous air exhaust is realized.
The internal mixer still includes the pneumatic control unit, the pneumatic control unit includes the booster pump, high-pressure tank and vacuum tank, evacuation pump and vacuum tank intercommunication, and still be equipped with first ooff valve between evacuation pump and the vacuum tank, booster pump and high-pressure tank intercommunication, and still be equipped with the second ooff valve between booster pump and the high-pressure tank, through being equipped with first control valve F1 intercommunication between vacuum tank and the collecting box 42, through being equipped with second control valve F2 intercommunication between vacuum tank and the negative pressure pipeline 41, through being equipped with third control valve F3 intercommunication between high-pressure tank and the negative pressure passageway, through being equipped with fourth control valve F4 intercommunication between high-pressure tank and the first gas blow pipe 12, through being equipped with fifth control valve F5 intercommunication between high-pressure tank and the second gas blow pipe 35.
Pressure sensors are arranged in the high-pressure tank and the vacuum tank respectively and used for detecting corresponding pressure values and feeding the pressure values back to the PLC control unit, and the opening and closing of a booster pump and a vacuum pump are controlled through the PLC control unit, the booster pump is used for supplying air to the high-pressure tank so that the high-pressure tank is maintained between preset pressure values, and the vacuum pump is used for vacuumizing the vacuum tank so that the vacuum tank is maintained between preset pressure values; through the setting of pneumatic control unit, can realize the automatic control of air feed and bleed, and can reduce the use of fan.
The preparation equipment of the preparation process of the ultralow-temperature retraction sealing material is controlled by a PLC control unit, pressure sensors are arranged in a collection box 42, a vacuum tank and a high-pressure tank, and an internal mixer comprises the following steps in the use process:
before banburying:
the weight 5 is at the highest position, the second control valve is opened, and the mixing chamber 1 is pumped through the negative pressure channel; putting the main material into a main material delivery bin, putting each powder auxiliary material into a powder auxiliary material delivery bin, and putting the liquid auxiliary material into a liquid auxiliary material delivery bin;
then the main material feeding bin is opened, the main material enters the banburying chamber 1 through the feeding cavity 2, and then the weight 5 descends;
in the banburying process:
the weight 5 descends to the lowest position, the discharge end of the feeding conveying screw 11 is in a closed state, and the negative pressure pipe performs air extraction on the banburying chamber 1 through the ventilation flow passage 51, so that dust and harmful gas in the banburying process are prevented from overflowing;
meanwhile, the discharging conveying screw 7 corresponding to the powder auxiliary material feeding bin is started to feed the powder into the weighing bin 8, the gravity sensor 29 feeds a detection signal back to the control unit, when the detected numerical value is equal to a preset value, the discharging conveying screw 7 is paused, the overturning motor drives the valve rod 26 to rotate, and the powder material falls to the bottom of the weighing bin 8; the PLC control unit opens the corresponding valve components according to the preset adding sequence of the auxiliary materials, and the powder materials enter the conveying channel 9; when all valve components are closed, the interior of the conveying channel 9 is communicated, and the powder material enters the temporary storage bin 36 through the mixing bin 10;
when auxiliary materials are required to be added, namely the adding time of the auxiliary materials is reached, the weight 5 rises to the middle position, and the air exhaust pipe 40 is in a closed state; the butterfly valve 38 is then opened and the feed conveyor screw 11 is activated to feed the material in the temporary storage bin 36 into the mixing chamber 1.
Banburying and weighing of auxiliary material are mixed and are gone on simultaneously, and production efficiency is higher, and weighs and throw the material and be automated control, and the cost of labor reduces, but production efficiency and shaping quality improve.
In the banburying process, when the weight 5 is at the lowest position, the control method of the vacuum adsorption device further comprises the following steps:
l1, detecting the instantaneous gas flow by the first flow sensor 45, and when the instantaneous gas flow detected by the first flow sensor 45 is lower than the preset flow value, the surface filter bag 44 may be blocked, and the step L2 is performed;
l2, closing the second control valve, opening the third control valve, opening the on-off valve 46 to realize reverse dust removal, detecting the pressure value in the collection box 42, when the pressure value reaches the preset pressure value, indicating that one-time reverse dust removal is finished, and entering the step L3; wherein when the open-close valve 46 is in an open state, the first control valve needs to be automatically in a closed state;
l3, the third control valve is closed, the open-close valve 46 is closed, the second control valve is opened, and then the process returns to the step L1; wherein when the on-off valve 46 is closed, the first control valve is opened again to return the pressure thereof to the preset low value due to the pressure rise in the collection tank 42.
The automatic suction and reverse dust removal can be realized through the method, wherein the PLC control unit further comprises a timing module and an alarm module, the timing module is used for timing the single opening time of the second control valve in the step L3, if the single opening time is longer than a preset time value, the single opening time is normal, and when the single opening time is shorter than or equal to the preset time value, the first negative pressure channel is abnormal, if the filter bag 44 is likely to fail, is extremely easy to block and needs to be replaced, the alarm module gives an alarm.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims (10)

1. A preparation process of an ultralow-temperature retraction sealing material is characterized by comprising the following steps: the method comprises the following steps:
preparing raw materials: the components comprise the following components in parts by weight: 100 parts of EPDM raw rubber; carbon black N55030-50 shares; 8-12 parts of a heat-resistant agent; 2-5 parts of an anti-aging agent; 4-6 parts of vulcanizing agent DCP; 1-3 parts of a crosslinking agent; 6-8 parts of zinc oxide; 1-2 parts of stearic acid; 15-25 parts of paraffin oil;
banburying: adding EPDM raw rubber into an internal mixer for plasticating for 2 minutes, then adding carbon black for plasticating for 2 minutes, then adding an anti-aging agent and a plasticizer for banburying for 6 minutes, then adding a heat-resistant agent, zinc oxide, stearic acid and paraffin oil for banburying for 3 minutes, wherein the banburying temperature is lower than 130 ℃; feeding the rubber material into an open mill after banburying;
open mixing: in the open milling process, a vulcanizing agent and an accelerator are subjected to thin pass for 3 times by adjusting the roll temperature to be 40-50 ℃ and the roll distance to be 2-3mm, and then the sheet is taken out after the open milling is carried out for 8 minutes.
2. The preparation process of the ultralow-temperature retraction sealing material as claimed in claim 1, wherein the preparation process comprises the following steps: the anti-aging agent adopts anti-aging agent SP-C and anti-aging agent 2246, and the anti-aging agent SP-C and the anti-aging agent 2246 are added according to the weight part ratio of 1: 1.
3. A preparation device suitable for the preparation process of the ultralow-temperature retraction sealing material as claimed in claim 1, is characterized in that: the internal mixer in the internal mixing step comprises an internal mixing chamber (1), an automatic feeding device and a vacuum adsorption device, wherein a screw is arranged in the internal mixing chamber (1), a feeding cavity (2) and an upper top bolt assembly are arranged at the top of the internal mixing chamber (1), the upper top comprises two first oil cylinders (3) arranged above the internal mixing chamber (1), piston rods of the two first oil cylinders (3) are connected through a cross beam, a second oil cylinder (4) is arranged on the cross beam, and the lower end of a piston rod of the second oil cylinder (4) is connected with a weight (5);
the automatic feeding device comprises a main material feeding bin, powder auxiliary material feeding bins and liquid auxiliary material feeding bins, wherein the main material feeding bin, the powder auxiliary material feeding bin and the liquid auxiliary material feeding bin are respectively communicated with a feeding cavity (2), the powder auxiliary material feeding bins are multiple groups, each group of powder auxiliary material feeding bin comprises a storage bin (6), a discharge conveying screw rod (7) and a weighing bin (8), the feed end of the discharge conveying screw rod (7) is communicated with the bottom of the storage bin (6), the discharge end of the discharge screw rod is communicated with the top of the weighing bin (8), the outlet end of the bottom of the weighing bin (8) on each group of powder auxiliary material feeding bin is commonly connected with a conveying channel (9), one end of the conveying channel (9) is provided with a mixing bin (10) and a feed conveying screw rod (11) which are sequentially connected, the other end of the conveying channel (9) is connected with a first air blowing pipe (12), and the discharge end of the feed conveying screw rod (11) is communicated with the feeding cavity (2), and a valve component which corresponds to the outlet end of each weighing bin (8) and is used for controlling the opening and the closing is also arranged on the conveying channel (9).
4. The preparation equipment of the preparation process of the ultralow-temperature retraction sealing material according to claim 3, characterized in that: the conveying channel (9) comprises a plurality of feeding pipelines (13) communicated with the outlet end at the bottom of the weighing bin (8), the conveying channel (9) is further provided with mounting pipelines symmetrically arranged with the feeding pipelines (13), the conveying channel (9) is further internally provided with a plurality of groups of flow guide structures, each flow guide structure comprises a first flow guide part (14) positioned at the upper part of the inner wall of the conveying channel (9) and a second flow guide part (15) positioned at the lower part of the inner wall of the conveying channel (9), a flow guide channel (16) is formed between the first flow guide part (14) and the second flow guide part (15) of the same group of flow guide structures, and the first flow guide part (14) and the second flow guide part (15) of two adjacent groups of flow guide structures form a storage channel (17);
the valve assembly comprises a sealing block (18) and a connecting rod (19) which are connected, the sealing block (18) is positioned in the conveying channel (9), the connecting rod (19) penetrates through the installation pipeline, and the valve assembly further comprises an electromagnetic assembly (20) and a return spring (21) which are used for driving the connecting rod (19) to lift;
the second flow guide part (15) comprises a windward wall (22), a sealing wall (23) and a leeward wall (24) which are sequentially connected, the windward wall (22) and the leeward wall (24) are obliquely arranged, and the sealing block (18) comprises a first sealing surface (52) which is used for radially abutting against the sealing wall (23), a second sealing surface (53) which is used for axially abutting against the first flow guide part (14), and a third sealing surface (54) which is used for sealing and installing a pipeline and is obliquely arranged;
when any group of valve components is opened, powder materials in the corresponding weighing bin (8) enter the material storage channel (17) along the third sealing surface (54), and the flow guide channel (16) is sealed by the first sealing surface (52) and the second sealing surface (53); when all sets of valve assemblies are closed, all sets of first sealing surfaces (52) and sealing walls (23) are separated, and the flow guide channels (16) are communicated.
5. The preparation equipment of the preparation process of the ultralow-temperature retraction sealing material according to claim 3, characterized in that: the powder material weighing device is characterized in that a valve port channel for powder material to pass through is arranged in the weighing bin (8), a control valve core for controlling the valve port channel to be opened and closed is arranged in the valve port channel, the control valve core comprises a turnover valve core and a turnover motor, the turnover valve core comprises a valve rod (26) and a valve plate (27) arranged on the valve rod (26), the valve rod (26) radially penetrates through the valve port channel, the turnover motor is arranged on the outer side of the valve port channel and drives the valve rod (26) to rotate, a weighing plate (28) is arranged on the valve plate (27), and a gravity sensor (29) is further arranged on the weighing plate (28).
6. The preparation equipment of the preparation process of the ultralow-temperature retraction sealing material according to claim 3, characterized in that: the mixing bin (10) comprises an air inlet channel (30), a mixing cavity and a discharge channel (31), the mixing cavity comprises an upper conical cavity (32) and a lower conical cavity (33) which are communicated, the inner diameter of the large end of the upper conical cavity (32) is equal to that of the large end of the lower conical cavity (33) and is in butt joint with the large end of the upper conical cavity, the small end of the upper conical cavity (32) is in butt joint with the air inlet channel (30), the large end of the lower conical cavity (33) is in butt joint with the discharge channel (31), a material blocking rod (34) is arranged in the discharge channel (31), an arc-shaped flow guide part which is right opposite to the air inlet channel (30) is arranged on the material blocking rod (34), the taper of the lower conical cavity (33) is larger than that of the upper conical cavity (32), the discharge end of the conveying channel (9) is positioned in the air inlet channel (30), and a second air blowing pipe (35) which is tangentially communicated with the air inlet channel (30) is further arranged on the mixing bin (10); the mixing bin (10) further comprises a temporary storage bin (36) communicated with the discharging channel (31), an exhaust port (37) is formed in the temporary storage bin (36), a filter screen is arranged on the exhaust port (37), and the bottom end of the temporary storage bin (36) is connected with the feeding end of the feeding conveying screw (11) through a butterfly valve (38).
7. The preparation equipment of the preparation process of the ultralow-temperature retraction sealing material according to claim 3, characterized in that: the vacuum adsorption device comprises an air exhaust pipe (40), a negative pressure pipeline (41), a collection box (42) and a vacuum pump, wherein the negative pressure pipeline (41) comprises an upper pipeline, a necking channel (43) and a lower pipeline which are sequentially communicated, the upper pipeline is communicated with the vacuum pump, the lower pipeline is communicated with the collection box (42), a filter bag (44) and a flow sensor (45) are arranged in the upper pipeline, the port of the upper pipeline is communicated with the vacuum pump, an opening and closing valve (46) is arranged between the lower pipeline and the collection box (42), one end of the air exhaust pipe (40) is communicated with the middle section of the feeding cavity (2), and the other end of the air exhaust pipe (40) is radially communicated with the necking channel (43);
the feeding cavity (2) comprises a main material feeding port (47) communicated with the main material feeding bin, a powder auxiliary material feeding port communicated with the feeding conveying screw rod (11), and a liquid auxiliary material feeding port (48) communicated with the liquid auxiliary material feeding bin, wherein the main material feeding port (47), the powder auxiliary material feeding port and the liquid auxiliary material feeding port (48) are all located below a pipe orifice of the air suction pipe (40), an air inlet channel (49) is further arranged at the top of the feeding cavity (2), an air guide channel (50) is further arranged in the feeding conveying screw rod (11), and two ends of the air guide channel (50) are communicated with a feeding end and a discharging end of the feeding conveying screw rod (11);
a ventilation flow channel (51) is further arranged on the inner wall of the feeding cavity (2), one end of the ventilation flow channel (51) extends into the banburying chamber (1), and the other end of the ventilation flow channel (51) extends to the middle section of the feeding cavity (2); when the weight (5) rises to the top end of the feeding cavity (2), the weight (5) is in butt seal with the air inlet channel (49), and the air exhaust pipe (40) is communicated with the feeding cavity (2); when the pressure weight (5) is positioned at the middle section of the feeding cavity (2), the pressure weight (5) is in abutting seal with the opening of the air exhaust pipe (40); when the weight (5) is positioned at the lower section of the feeding cavity (2), the weight (5) is in butt seal with the powder auxiliary material feeding port, and the banburying chamber (1) is communicated with the air exhaust pipe (40) through the ventilation flow passage (51).
8. The preparation equipment of the preparation process of the ultralow-temperature retraction sealing material according to claim 3, characterized in that: the internal mixer further comprises a pneumatic control unit, the pneumatic control unit comprises a booster pump, a high-pressure tank and a vacuum tank, the vacuum pump is communicated with the vacuum tank, a first switch valve is further arranged between the vacuum pump and the vacuum tank, the booster pump is communicated with the high-pressure tank, a second switch valve is further arranged between the booster pump and the high-pressure tank, the vacuum tank is communicated with the collecting tank (42) through the first control valve, the vacuum tank is communicated with the negative pressure pipeline (41) through the second control valve, the high-pressure tank is communicated with the negative pressure pipeline through the third control valve, the high-pressure tank is communicated with the first air blowing pipe (12) through the fourth control valve, and the high-pressure tank is communicated with the second air blowing pipe (35) through the fifth control valve.
9. The preparation equipment of the preparation process of the ultralow-temperature retraction sealing material according to claim 3, characterized in that: the preparation equipment is controlled by a PLC control unit, pressure sensors are arranged in the collection box (42), the vacuum tank and the high-pressure tank, and the internal mixer comprises the following steps in the using process:
before banburying:
the weight (5) is positioned at the highest position, the second control valve is opened, and the mixing chamber (1) is pumped through the negative pressure channel; putting the main material into a main material delivery bin, putting each powder auxiliary material into a powder auxiliary material delivery bin, and putting the liquid auxiliary material into a liquid auxiliary material delivery bin;
in the banburying process:
the weight (5) descends to the lowest position, the discharge end of the feeding conveying screw (11) is in a closed state, and the negative pressure pipe performs air extraction on the mixing chamber (1) through the ventilation flow channel (51);
meanwhile, a discharging conveying screw (7) corresponding to the powder auxiliary material feeding bin is started, powder is fed into the weighing bin (8), a detection signal is fed back to the control unit by a gravity sensor (29), when the detected numerical value is equal to a preset value, the discharging conveying screw (7) is paused, and a driving valve rod (26) is driven by a turnover motor to rotate, so that the powder material falls to the bottom of the weighing bin (8); the PLC control unit opens the corresponding valve components according to the preset adding sequence of the auxiliary materials, and the powder materials enter the conveying channel (9); when all valve components are closed, the interior of the conveying channel (9) is communicated, and the powder material enters the temporary storage bin (36) through the mixing bin (10);
when auxiliary materials need to be added, the weight (5) is in the middle position, and the air exhaust pipe (40) is in a closed state; then the butterfly valve (38) is opened, the feeding and conveying screw (11) is started, and the materials in the temporary storage bin (36) are conveyed into the banburying chamber (1).
10. The preparation equipment of the preparation process of the ultralow-temperature retraction sealing material according to claim 9, characterized in that: in the banburying process, when the weight (5) is at the lowest position, the control method of the vacuum adsorption device further comprises the following steps:
l1, detecting the instantaneous gas flow by the first flow sensor (45), and entering the step L2 when the instantaneous gas flow detected by the first flow sensor (45) is lower than a preset flow value;
l2, closing the second control valve, opening the third control valve, opening the opening and closing valve (46), detecting the pressure value in the collecting box (42), and entering the step L3 when the pressure value reaches the preset pressure value;
l3, the third control valve is closed, the open/close valve (46) is closed, the second control valve is opened, and the process returns to step L1.
CN202110505878.0A 2021-05-10 2021-05-10 Preparation process and preparation equipment of ultralow-temperature retraction sealing material Pending CN113232182A (en)

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CN114773700A (en) * 2022-05-31 2022-07-22 浙江百朗士橡塑科技有限公司 Low-hardness flame-retardant chloroprene rubber shockproof ring material and preparation process thereof
CN117415967A (en) * 2023-10-13 2024-01-19 浙江百朗士新材料有限公司 Production process and production equipment of low-temperature low-retraction sealing material
CN117415967B (en) * 2023-10-13 2024-05-03 浙江百朗士新材料有限公司 Production process and production equipment of low-temperature low-retraction sealing material

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114773700A (en) * 2022-05-31 2022-07-22 浙江百朗士橡塑科技有限公司 Low-hardness flame-retardant chloroprene rubber shockproof ring material and preparation process thereof
CN117415967A (en) * 2023-10-13 2024-01-19 浙江百朗士新材料有限公司 Production process and production equipment of low-temperature low-retraction sealing material
CN117415967B (en) * 2023-10-13 2024-05-03 浙江百朗士新材料有限公司 Production process and production equipment of low-temperature low-retraction sealing material

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