A manufacturing method for winding and forming a rubber expansion joint

Abstract

A manufacturing method for winding and forming a rubber expansion joint. The rubber expansion joint is made of the following components: basic raw rubber; reinforcing filler; volume-increasing filler; special filler; process operation aid; vulcanization activator; rubber protective aid; vulcanizing agent; vulcanization accelerator. The manufacturing method is as follows: First, process the rubber raw rubber into a rubber compound colloid. Second, prepare a preformed rubber sheet. Third, prepare a preformed rubberized cord fabric. Fourth, wind and form the inner rubber sheet. Fifth, draw lines for isolation. Sixth, wind and form the inner reinforcing cord fabric. Seventh, wind and form the outer cord fabric of the rubber expansion joint. Ninth, wind and form the outer rubber of the rubber expansion joint. Tenth, exhaust air, shape with a bandage, and compact with a cotton rope. Eleventh, final sizing. Twelfth, integral two-stage vulcanization. The present invention improves the product quality, service performance, and use safety, extends the service life, and has a wide range of applications.

Description

Technical Field

[0001] The present invention relates to the field of manufacturing rubber expansion joints, and particularly to a manufacturing method for winding and forming rubber expansion joints. Background Art

[0002] At present, most rubber expansion joints on the market adopt a molded or pressure-injected molding structure. Its advantages are: (1) short product manufacturing cycle and low cost; (2) beautiful and smooth appearance molding; (3) high production efficiency. However, it also has many disadvantages: (1) high technical requirements and high cost for mold manufacturing; (2) poor mold adaptability (special molds are required for each change in pressure grade, specification model, product design thickness and length, number of layers of reinforcing fabric design, design mountain shape change, etc.); (3) single product structure, basically a combination of pure rubber and reinforcing fabric, with low product strength grade; (4) due to the large mountain shape span required by the molded and pressure-injected molding processes, the bearing area is large, resulting in a large acting force under the same specification and pressure grade, greatly reducing the compressive strength grade of the rubber expansion joint and restricting its application in large-diameter medium-high pressure fields; (5) the huge extrusion force generated by the preformed filling of raw rubber and reinforcing fabric in the mold cavity under the action of molding or pressure injection destroys the warp and weft arrangement density of the reinforcing fabric, often generating bursting and piercing points during the processing, greatly reducing its compressive strength grade and making the compressive strength grade uncontrollable; (6) the quality consistency of rubber expansion joints produced by this process is poor, with low reliability, high product failure rate during use, and poor safety (tests have found that the compressive strength grades of products of the same specification model, pressure grade, and the same batch often differ by several times or more); (7) the product basically has no ability to resist vacuum negative pressure, and accidental negative pressure in the pipeline or system easily causes abnormal deformation or even suction collapse of the rubber mountain shape, so it has poor adaptability to application scenarios with alternating positive and negative pressures in the system (most operating pipelines have this requirement). The rubber expansion joints manufactured by the above manufacturing methods have relatively low compressive strength grades themselves. Moreover, due to the inherent defects of their manufacturing methods - destroying the warp and weft arrangement density of the reinforcing fabric to generate bursting and piercing points, making the pressure grade unpredictable or resulting in large discreteness of product quality, their compressive strength is greatly reduced during use, and the safety risk coefficient is relatively high, which is greatly restricted in the fields of nuclear power, chemical safety, ships, offshore transportation, medium-high pressure and above fields, as well as fields with high requirements for operation reliability, safety, and performance. Summary of the Invention

[0003] The object of the present invention is to solve the above technical problems and provide a manufacturing method for winding and forming rubber expansion joints.

[0004] To achieve the above technical objectives and meet the above technical requirements, the technical solution adopted by the present invention is as follows: A manufacturing method for winding and forming a rubber expansion joint, characterized in that the rubber expansion joint is made of the following components in parts by weight: 100 parts of basic raw rubber or 100 - 150 parts of oil-extended basic raw rubber; 20 - 60 parts of reinforcing filler; 10 - 40 parts of volume-increasing filler; 5 - 35 parts of filler; 5 - 25 parts of process operation aid; 2 - 8 parts of vulcanization activator; 0.5 - 4.5 parts of rubber protective aid; 0.2 - 5.0 parts of vulcanizing agent; 0.1 - 2.5 parts of vulcanization accelerator; and its manufacturing method includes the following steps:

[0005] Step 1: Add rubber raw rubber and various rubber compounding agents, and mix them into various rubber masterbatch colloids with processing performance through a rubber mixing equipment; measure and add them to a rubber internal mixer according to the fixed formula ratio confirmed by the process, and mix them into various rubber masterbatch colloids under pressure;

[0006] Step 2: Preparation of preformed rubber sheet; The rubber masterbatch colloid processed in Step 1 is filtered and purified → extruded and drawn into strips → cooled to 5°C - 35°C → cold feeding extrusion with long pin type → extrusion with duckbill type → pressing by a two-roll calender → air-cooling by pick-up → cooling by four rolls to 35°C - 45°C → tension-free winding → preparation of the preformed rubber sheet for the rubber expansion joint;

[0007] Step 3: Preparation of preformed rubberized cord fabric; Prepare the rubberized cord fabric rubber masterbatch colloid according to the method and formula ratio in Step 1, take out the sheet through an open mill → isolate with an isolating liquid → convey and cool through an air duct → slice → feed into a four-roll calender → tension the impregnated cord fabric → double-sided rubberize the impregnated cord fabric → isolate with a backing cloth → pre-tighten and wind up → preformed rubberized cord fabric;

[0008] Step 4: Winding and laminating forming of the inner layer rubber sheet;

[0009] 1) Calculate the blanking size, forming thickness and forming layers of the inner rubber 10 of the rubber expansion joint according to the size of the reusable forming rubber mountain 13 in the rubber expansion joint forming die and the product structure length as required by the design drawing and the process construction, and blank the preformed rubber sheet obtained in the second step; 2) Fix the starting point of the preformed rubber sheet after blanking in the above step 1 on both sides of the reusable forming rubber mountain 13 respectively along the middle of both sides of the preformed rubber sheet wound and formed by using the process exhaust needle. Start the rubber expansion joint forming machine (not shown in the schematic diagram) and rotate the rubber expansion joint forming mandrel 1 clockwise at a low speed. Stop rotating when it reaches the starting point. Apply a chemical cleaning and tackifying agent to the outer surface of the preformed rubber sheet within a range of about 10 mm at the starting point, then carry out joint lap, and roll and compact along the lap with a roller (not shown in the schematic diagram). At the same time, press and compact along the bottom of both sides of the reusable forming rubber mountain 13 with a roller; Start the rubber expansion joint forming machine and rotate the rubber expansion joint forming mandrel 1 clockwise at a medium or low speed. Wrap the preformed rubber sheet wound and formed with a water wrapping cloth bandage same as the sizing water wrapping cloth bandage 11 from the bottom of both sides of the reusable forming rubber mountain 13 to the outside. When wrapping, ensure that the next layer of the bandage has 1 / 2 - 1 / 3 pressed on the previous layer of the bandage, and ensure that the bandage is tightly pressed during wrapping to achieve good shaping and exhaust. Stop the rubber expansion joint forming machine after winding; Complete the shaping time of 15 - 30 minutes according to the specification requirements. Start the rubber expansion joint forming machine and rotate the rubber expansion joint forming mandrel 1 counterclockwise at a high speed to remove and wind up the sizing bandage, wipe the surface to make it dry, apply a chemical reagent to clean and remove surface impurities and increase tackiness;

[0010] Step Five: Marking and Isolation; Calculate the flanging and fitting parts of the rubber expansion joint according to the product structure length required by the design drawing and the construction process requirements; Use a marker pen to draw a circumferential line along the symmetric and appropriate parts on both sides of the forming rubber mountain 13 for marking, and apply isolation powder to the rubber surface of the flanging and fitting parts outside the marked line by patting with an isolation bag. Clean and increase the tackiness of the rubber surface part contaminated by the isolation powder inside the marked line with a chemical cleaning agent;

[0011] Step 6. Inner reinforcing cord fabric winding and forming: Calculate the cutting size of the preformed skim-coated cord fabric obtained in Step 3 according to the product structure length required by the design drawing and construction process. Calculate the cutting angle of 30° - 60° for the preformed skim-coated cord fabric obtained in Step 3 according to the rubber mountain structure of the rubber expansion joint, the compressive strength grade, and the construction process method. Cut the required number of skim-coated cord fabrics according to the cutting angle, the circumference size, and the inner cord fabric layer 9 of the rubber expansion joint required by the construction process, based on the width of the preformed skim-coated cord fabric obtained in Step 3. Wind and form the preformed skim-coated cord fabric after cutting according to the manufacturing process method in Step 4. Each adjacent two layers are wound and bonded alternately in a positive and negative symmetry according to the cutting angle to form a compressive layer with the cord fabric warp arranged densely at approximately 90°. Use the same pressing roller as in Step 4 to press and compact its surface and the bottom parts of both feet of the reusable forming rubber mountain 13 on both sides. For the bottom parts of both feet of the reusable forming rubber mountain 13 on both sides of the innermost adjacent two layers of inner cord fabrics after forming, apply a pre-tightening force with cord fabric strips 2.5 - 25 mm wide respectively, and start the rubber expansion joint forming machine to rotate clockwise at a low speed for winding, tightening, and compaction. Perform the winding and forming operations for the remaining inner skim-coated cord fabric layers according to the above requirements until the required number of wound and formed cord fabric layers meets the requirements of the drawing and construction process to form the inner cord fabric 9 of the rubber expansion joint (including all the inner wound and formed cord fabric layers). Note that multi-layer lamination (adjacent two layers are wound and bonded alternately in a positive and negative manner) winding and forming are used. The lap joints of each layer of formed cord fabric are distributed approximately symmetrically and evenly in the circumferential direction, and each layer cannot be at the same position. The lap width is about 5 - 15 mm. Press, shape, exhaust, and remove every two layers of cord fabric layers with a similar 11 - shaping bandage (water wrap bandage) according to the winding and pressing method in Step 5. The number of wound and formed cord fabric layers can only be an even number to ensure that the cord fabric warp is arranged densely at approximately 90° to form a good compressive layer. Draw lines for isolation between every two layers of cord fabric according to the method shown in Step 5. After all the inner cord fabric 9 of the rubber expansion joint is wound and formed, apply a pre-tightening force with cord fabric strips 5 - 30 mm wide respectively to the bottom parts of both feet of the reusable forming rubber mountain 13 on both sides after forming, and start the rubber expansion joint forming machine to rotate clockwise at a low speed for winding, tightening, and compaction;

[0012] Step 7: Installation of the flange assembly for the rubber expansion joint; Loosen the connecting bolts 4 and nuts 3 between the rubber expansion joint forming side plate 5 on the rubber expansion joint forming core tool 1 and the flange assembly 6 for the rubber expansion joint. Try to fit the reinforcing insertion tube 6-2 of the flange assembly for the rubber expansion joint into the inner rubber layer 10 of the rubber expansion joint and the inner cord fabric layer 9 of the rubber expansion joint that have been successfully wound and formed. Determine the adjustment with intermediate rubber (not shown in the figure) according to the fitting clearance to achieve a gapless fit. Install the flange assembly 6 for the rubber expansion joint with a fixed length according to the product structure length requirements; Conduct the bonding of the transition rubber for the sealing surface according to the sealing structure type and the sealing surface dimensions of the flange assembly for the rubber expansion joint. Clean the surface of the tackifying transition rubber and the surface of the turned-up cord fabric with a chemical cleaning agent, and conduct the turned-up bonding for every two layers of cord fabric respectively; During this period, conduct chemical cleaning agent soaking, tackifying and turned-up bonding on the surface with parting powder until all the inner cord fabric layer 9 and the inner rubber layer 10 of the rubber expansion joint are completely turned up and bonded. Closely fit the rubber expansion joint forming side plate 5 with the flange assembly 6 for the rubber expansion joint after turned-up bonding, so that the bolt holes 6-1 of the flange assembly and the center of the connecting bolt holes from the rubber expansion joint forming side plate 5-1 are on the same straight line. Use a special hole-opening die and hole-opening tool suitable for the connecting bolt holes to respectively open holes for all bolt holes and remove the rubber blocking the screw holes. Insert a special perforated pipe plug to prevent the rubber from flowing into the screw holes during vulcanization, resulting in lack of rubber in the rubber sealing surface and difficulty in cleaning the rubber inside the screw holes. Connect and tighten with connecting bolts 4, adjusting washers 2 and nuts 3 symmetrically along the flange circumference according to the process requirements. When tightening the bolts, make a little rubber overflow from the outer circumference of the flange assembly for the rubber expansion joint to ensure that there will be no lack of rubber defects during the vulcanization process;

[0013] Step Eight: Winding and bonding the outer cord fabric of the rubber expansion joint; Calculate the cutting size of the preformed skim-coated cord fabric obtained in Step Three according to the product structure length and construction process requirements, calculate the cutting angle of 30° - 60° of the preformed skim-coated cord fabric obtained in Step Three according to the rubber mountain structure, compressive strength grade and construction process method of the rubber expansion joint, and cut the required number of skim-coated cord fabrics according to the cutting angle, perimeter size and the outer cord fabric layer 8 of the rubber expansion joint required by the construction process requirements at the width of the preformed skim-coated cord fabric obtained in Step Three; Before winding and bonding the outer cord fabric of the rubber expansion joint, first fill the gap formed between the reinforcing insertion tube 6-2 of the rubber expansion joint installed in Step Seven and the surface of the inner cord fabric 9 of the rubber expansion joint and the foot of the reused forming rubber mountain 13 with rubber strips (not shown in the figure), and then carry out the winding and bonding of the transition rubber in the same way and procedure as the inner layer rubber winding and bonding in Step Four to form a good rubber transition layer between the reinforcing insertion tube 6-2 of the rubber expansion joint matching flange assembly and the outer cord fabric layer 8 of the rubber expansion joint, and enhance the bonding force between the metal and the cord fabric layer; Complete the winding and bonding of the outer cord fabric 8 of the rubber expansion joint on the transition rubber layer after the above construction according to Step Six;

[0014] Step Nine: Winding and bonding the outer layer rubber of the rubber expansion joint; Complete the winding and bonding of the outer layer rubber 7 of the rubber expansion joint according to Step Four;

[0015] Step Ten: Exhausting, bandage shaping, and cotton rope pressing and compacting; Use an exhaust needle to punch holes for exhausting along the above-mentioned winding and bonding layer. The exhaust needle should ensure that it penetrates from the outermost layer of the outer layer rubber 7 of the rubber expansion joint to the innermost layer of the inner layer rubber 10 of the rubber expansion joint on the surface of the rubber expansion joint forming core tool 1, and ensure that the holes are evenly distributed along the circumferential surface, especially at the two feet of the reused forming rubber mountain. The distribution density of the exhaust holes shall not be less than 10 per square decimeter. Start the rubber forming machine to rotate clockwise at a low speed, apply a pre-tightening force to the shaping water cloth bandage 11 and wind the water cloth bandage from the two feet of the reused forming rubber mountain 13 towards the inner side of the rubber expansion joint matching flange assembly 6 respectively to extrude and exhaust the gas of the rubber and cord fabric in sequence. When winding, ensure that half of the next circle of the bandage is pressed on the previous circle of the bandage to ensure uniform exhaust. Keep the shaping time for 15 - 30 minutes according to the shaping process requirements, and start the rubber forming machine to rotate counterclockwise at a medium or high speed to remove and wind up the bandage; Start the rubber forming machine to rotate clockwise at a low speed, apply a pre-tightening force to the shaping water cloth bandage 11 and wind the shaping water cloth bandage or cotton bandage from the inner side of the rubber expansion joint matching flange assembly 6 to the other inner side of the rubber expansion joint matching flange assembly in sequence. The figure only shows a schematic of one layer. When winding, ensure that half of the next circle of the bandage is pressed on the previous circle of the bandage; And arrange the high-temperature reusable shaping cotton ropes 12 closely in sequence on the formed bandage. When winding, ensure that the cotton ropes are arranged neatly, tightly, in a scattered and orderly manner, with distinct layers and appropriate tightness;

[0016] Step Eleven: Final fine-tuning of the fixed length and fixation; Distribute the vulcanization limit pull rods 15 of the rubber expansion joint evenly along the limit ear plate connection holes 6-4 on the limit ear plates 6-3 of the flange assembly 6 for the rubber expansion joint that is circumferentially arranged for the rubber expansion joint. Arrange the limit pull rod adjustment washers 16 and limit pull rod nuts 17 on the vulcanization limit pull rods 15 of the rubber expansion joint in sequence; Rotate the limit pull rod nuts for size fine-tuning and locking according to the product structure length required by the drawing. Use the forming side plate vulcanization positioning baffle 14 to closely adhere to the outer side of the rubber expansion joint forming side plate 5 along the circumferential surface of the rubber expansion joint forming core 1 for positioning and fixation.

[0017] Step Twelve: Overall two-stage vulcanization in the vulcanization autoclave; The rubber expansion joint wound and formed in the above Steps One to Eleven together with the rubber expansion joint forming core enters the direct steam pressurized vulcanization autoclave for overall vulcanization. The specific implementation is as follows: Heating and pressurizing → Discharging sewage → First-stage heat preservation and pressure vulcanization → Discharging sewage → Second-stage natural cooling and pressure reduction with low temperature and long time vulcanization → Pressure relief and exhaust → Cooling and discharging from the autoclave → Demolding.

[0018] Preferably: The basic raw rubber is one or a combination of styrene-butadiene rubber, chloroprene rubber, ethylene propylene diene monomer rubber, butyl rubber, and nitrile rubber.

[0019] Preferably: The reinforcing filler is one or a combination of N330 carbon black, N550 carbon black, and N660 carbon black.

[0020] Preferably: The volume-increasing filler is one or a combination of calcium carbonate, calcium bicarbonate, kaolin, and bentonite.

[0021] Preferably: The filler is wear-resistant filler, anti-corrosion filler, and radiation-resistant filler.

[0022] Preferably: The process operation aids are one or a combination of dispersant; lubricant; plasticizer; tackifier; The dispersant is Gumix T-78A, carbon black; The lubricant is paraffin wax; The plasticizers are dibutyl phthalate, dioctyl phthalate, naphthenic oil, machine oil, aromatic oil; The tackifiers are coumarone resin, rosin, and phenolic resin.

[0023] Preferably, the rubber protective agent is one or a combination of antioxidants, antiozonants, anti-flex cracking agents, light stabilizers, ultraviolet light absorbers, harmful metal inhibitors, and mildew inhibitors; the antioxidant is antioxidant A, antioxidant D, or antioxidant DNP; the antiozonant is antioxidant 4010 or antioxidant 4010NA; the anti-flex cracking agent is antioxidant 4020 or anti-cracking agent B-10; the light stabilizer is phosphite GW-540; the ultraviolet light absorber is 2-(2-hydroxy-5-methylphenyl) benzotriazole or 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole; the harmful metal inhibitor is antioxidant MB, antioxidant MBZ, antioxidant D, or antioxidant 4010NA; the mildew inhibitor is sodium benzoate, mildew inhibitor N-(trichloromethylthio) phthalimide, or docosahexaenoic acid.

[0024] Preferably, the vulcanization activator is one or a combination of zinc oxide, magnesium oxide, stearic acid, and calcium stearate.

[0025] Preferably, the vulcanizing agent is one or a combination of dicumyl peroxide vulcanizing agent DCP or diallyl phthalate crosslinking agent TAIC, sulfur, or insoluble sulfur.

[0026] Preferably, the vulcanization accelerator is one or a combination of diphenylguanidine, dibenzothiazole disulfide, 2-mercaptobenzothiazole, N-cyclohexyl-2-benzothiazole sulfenamide, tetramethylthiuram disulfide, or 1,2-ethylenethiourea.

[0027] The present invention greatly improves the product quality, service performance, and service safety, extends the service life, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of the winding forming die for the rubber expansion joint in the present invention;

[0029] Figure 2 is Figure 1 the enlarged view at A in

[0030] In the figure: 1. Rubber expansion joint forming core tool, 1-1. Tailstock thimble hole of the rubber expansion joint forming core tool, 1-2. Claw support column of the rubber expansion joint forming core tool, 2. Adjusting gasket, 3. Nut, 4. Connecting bolt, 5. Rubber expansion joint forming side plate, 5-1. Connecting bolt hole of the rubber expansion joint forming side plate, 5-2. Sealing surface forming groove of the rubber expansion joint forming side plate, 6. Rubber expansion joint matching flange assembly, 6-1. Flange assembly connecting bolt hole, 6-2. Reinforcing insertion tube of the rubber expansion joint matching flange assembly, 6-3. Limiting ear plate of the rubber expansion joint matching flange assembly, 6-4. Limiting ear plate bolt connection hole, 7. Outer rubber of the rubber expansion joint, 8. Outer cord fabric of the rubber expansion joint, 9. Inner cord fabric of the rubber expansion joint, 10. Inner rubber of the rubber expansion joint, 11. Shaping bandage, 12. High-temperature reusable shaping cotton rope, 13. Reusable forming rubber mountain, 14. Sulfurization positioning baffle of the forming side plate, 15. Rubber expansion joint sulfurization limiting pull rod, 16. Limiting pull rod adjusting gasket, 17. Limiting pull rod nut. Detailed implementation mode The present invention will be further described below with reference to the accompanying drawings.

[0031] A winding forming manufacturing method for a rubber expansion joint, characterized in that the rubber expansion joint is made of the following components in parts by weight: 100 parts of basic raw rubber or 100-150 parts of oil-extended basic raw rubber; 20-60 parts of reinforcing filler; 10-40 parts of volume-increasing filler; 5-35 parts of filler; 5-25 parts of process operation aid; 2-8 parts of vulcanization activator; 0.5-4.5 parts of rubber protective aid; 0.2-5.0 parts of vulcanizing agent; 0.1-2.5 parts of vulcanization accelerator; and its manufacturing method includes the following steps:

[0032] Step 1: Add rubber raw rubber and various rubber compounding agents, and mix them into various rubber compounded rubber colloids with processing performance through a rubber mixing equipment; respectively measure and add them to a rubber internal mixer according to the fixed formula ratio confirmed by the process, and mix them into various rubber compounded rubber colloids.

[0033] Step 2: Preparation of preformed rubber sheet; the rubber compounded rubber colloid processed in Step 1 is filtered and purified → extruded and drawn into strips → cooled to 5°C - 35°C → cold feeding extrusion with long pin type → duckbill extrusion → pressing by a two-roll calender → air-cooling by transfer → cooling to 35°C - 45°C by four rolls → tension-free coiling → preparation of the preformed rubber sheet for the rubber expansion joint.

[0034] Step 3: Preparation of preformed rubberized cord fabric; prepare the rubberized cord fabric rubber compounded rubber colloid according to the method and formula ratio in Step 1, take out the sheet through an open mill → isolate with an isolating liquid → convey and cool through an air duct → slice → feed into a four-roll calender → tension the impregnated cord fabric → double-sided rubberize the impregnated cord fabric → isolate with a backing cloth → pre-tighten and wind up → preformed rubberized cord fabric.

[0035] Step Four: Winding and forming the inner rubber sheet;

[0036] 1) Calculate the cutting size, forming thickness, and forming layers of the inner rubber 10 of the rubber expansion joint according to the dimensions of the reusable forming rubber mountain 13 in the rubber expansion joint forming die, the product structure length, and the construction requirements of the design drawings and process. Cut the preformed rubber sheet obtained in Step Two; 2) At the starting point of the preformed rubber sheet after cutting in 1) above, use a process exhaust needle to fix it on both sides of the reusable forming rubber mountain 13 along the middle of both sides of the winding and forming preformed rubber sheet respectively. Start the rubber expansion joint forming machine (not shown in the schematic diagram) and rotate the rubber expansion joint forming core 1 clockwise at a low speed. Stop rotating when reaching the starting point. Apply a chemical cleaning and tackifying agent to the outer surface within a range of about 10 mm at the starting point of the preformed rubber sheet, then perform joint overlap. Use a pressing roller (not shown in the schematic diagram) to roll and compact along the overlap, and at the same time, use a pressing roller to press and compact along the bottom of both sides of the reusable forming rubber mountain 13; Start the rubber expansion joint forming machine and rotate the rubber expansion joint forming core 1 clockwise at a medium or low speed. Wrap the wound and formed preformed rubber sheet with a water wrap bandage 11 identical to the sizing water wrap bandage from the bottom of both sides of the reusable forming rubber mountain 13 to the outside. When wrapping, ensure that the next layer of the bandage has 1 / 2 - 1 / 3 pressing on the previous layer of the bandage, and ensure that the bandage is tightly pressed during wrapping to achieve good shaping and exhaust. Stop the rubber expansion joint forming machine after winding; According to the specification requirements, complete the sizing time of 15 - 30 minutes. Start the rubber expansion joint forming machine and rotate the rubber expansion joint forming core 1 counterclockwise at a high speed to remove and wind up the sizing bandage, wipe the surface to make it dry, apply a chemical reagent to clean and remove surface impurities and increase tackiness; Adopt multi-layer stratified winding and forming and laminating. The lap joints of each layer of the formed rubber sheet are approximately symmetrically and evenly distributed in the circumferential direction. The laps of each layer cannot be at the same position, and the lap width is about 5 - 15 mm;

[0037] Step Five: Marking and isolation; Calculate the flanging and laminating parts of the rubber expansion joint according to the product structure length required by the design drawings and construction process requirements; Use a marker pen to draw a circumferential line along the symmetrically appropriate parts on both sides of the forming rubber mountain 13 for marking, and apply isolation powder to the rubber surface of the parts outside the marking that need to be flanged and laminated by patting with an isolation bag. Clean and increase the tackiness of the parts on the rubber surface inside the marking line that are contaminated by the isolation powder with a chemical cleaning agent;

[0038] Step 6. Inner reinforcement cord fabric winding and forming: Calculate the cutting size of the preformed skimmed cord fabric obtained in Step 3 according to the product structure length required by the design drawing and construction process. Calculate the cutting angle of 30° - 60° for the preformed skimmed cord fabric obtained in Step 3 according to the rubber mountain-shaped structure, compressive strength grade and construction process method of the rubber expansion joint. Cut the required number of skimmed cord fabrics according to the cutting angle, perimeter size and the inner cord fabric layer 9 of the rubber expansion joint required by the construction process, with the width of the preformed skimmed cord fabric obtained in Step 3. Wind and form the preformed skimmed cord fabric after cutting according to the manufacturing process method in Step 4. Each adjacent two layers are wound and bonded alternately in a positive and negative symmetry according to the cutting angle to form a compressive layer with the cord fabric warp arranged densely at approximately 90°. Use the same pressing roller as in Step 4 to press and compact its surface and the bottom parts of both sides of the reusable forming rubber mountain 13. For the bottom parts of both sides of the reusable forming rubber mountain 13 where the two adjacent inner cord fabric layers are formed at the bottom layer, apply a pre-tightening force with cord fabric strips 2.5 - 25 mm wide respectively. Start the rubber expansion joint forming machine to rotate clockwise at a low speed for winding, tightening and compaction. Note that this process operation is very important and has two main process advantages. Firstly, tightening and compaction at the bottom of the mountain can make the inner rubber layer and the bottom part of the inner cord fabric layer at the bottom of the mountain close, and discharge the trapped gas formed by the contact. Secondly, it can make the inner rubber layer and the inner cord fabric layer vulcanize and bond well at the bottom of the mountain, without defects such as delamination, peeling, shelling, and air bubbles. Carry out the winding and forming operations for the remaining inner skimmed cord fabric layers according to the above requirements until the required number of winding and forming cord fabric layers meets the requirements of the drawing and construction process to form the inner cord fabric 9 of the rubber expansion joint (including all inner winding and forming cord fabric layers). Note that multi-layer stratified (adjacent two layers are wound and bonded alternately in a positive and negative symmetry) winding and forming are used. The lap joints of each formed cord fabric layer are approximately symmetrically and evenly distributed in the circumferential direction, and each layer cannot be at the same position. The lap width is about 5 - 15 mm. Press and shape, exhaust, and remove every two cord fabric layers with a similar 11 - shaping bandage (water - wrapped cloth bandage) according to the winding and pressing method in Step 5. The number of winding and forming cord fabric layers can only be an even number to ensure that the cord fabric warp is arranged densely at approximately 90° to form a good compressive layer. Draw a line for isolation between every two cord fabric layers according to the method shown in Step 5. After all the inner cord fabric 9 of the rubber expansion joint is wound and formed, apply a pre - tightening force with cord fabric strips 5 - 30 mm wide respectively to the bottom parts of both sides of the reusable forming rubber mountain 13 after forming. Start the rubber expansion joint forming machine to rotate clockwise at a low speed for winding, tightening and compaction;

[0039] Step 7: Installation of the flange assembly for the rubber expansion joint; Loosen the connecting bolts 4 and nuts 3 between the rubber expansion joint forming side plate 5 on the rubber expansion joint forming core tool 1 and the rubber expansion joint matching flange assembly 6. Try to fit the reinforcement insertion pipe 6-2 of the rubber expansion joint matching flange assembly of the rubber expansion joint matching flange assembly 6 onto the qualified inner rubber 10 of the wound and formed rubber expansion joint and the rubber expansion joint inner cord fabric 9 layers. Determine the adjustment with intermediate rubber (not shown in the figure) according to the fitting gap to achieve a gapless fit. Install the rubber expansion joint matching flange assembly 6 with a fixed length according to the product structure length requirements; Conduct the bonding of the sealing surface transition rubber according to the rubber expansion joint sealing structure type and sealing surface size of the rubber expansion joint matching flange assembly 6. Clean the surface of the tackifying transition rubber and the surface of the flanged cord fabric with a chemical cleaning agent, and conduct the flanging and bonding of every two layers of cord fabric respectively; During this period, conduct chemical cleaning agent penetration cleaning, tackifying and flanging and bonding on the surface with parting powder until all the rubber expansion joint inner cord fabric 9 and the rubber expansion joint inner rubber 10 are completely flanged and bonded. Closely fit the rubber expansion joint forming side plate 5 with the rubber expansion joint matching flange assembly 6 after flanging and bonding, so that the flange assembly connecting bolt holes 6-1 and the rubber expansion joint forming side plate 5-1 are centered on the connecting bolt holes and are on the same straight line. Use a special hole-opening die and hole-opening tool suitable for the connecting bolt holes to open holes for all bolt holes and remove the rubber blocking the screw holes. Insert a special perforated pipe plug to prevent the rubber from flowing into the screw holes during vulcanization, resulting in lack of rubber in the rubber sealing surface and difficulty in cleaning the rubber entering the screw holes. Connect and tighten with connecting bolts 4, adjusting washers 2 and nuts 3 at symmetric positions along the flange circumference according to the process requirements. When tightening the bolts, make a little rubber overflow from the outer circumference of the rubber expansion joint matching flange assembly to ensure that there will be no lack of rubber defects during the vulcanization process;

[0040] Step Eight: Winding and laminating the outer cord fabric of the rubber expansion joint; Calculate the cutting size of the preformed skim-coated cord fabric obtained in Step Three according to the product structure length and construction process requirements, calculate the cutting angle of 30° - 60° for the preformed skim-coated cord fabric obtained in Step Three according to the rubber mountain-shaped structure, compressive strength grade and construction process method of the rubber expansion joint, and cut the required amount of skim-coated cord fabric according to the cutting angle, perimeter size and the outer cord fabric layer 8 of the rubber expansion joint required by the construction process, with the width of the preformed skim-coated cord fabric obtained in Step Three; Before winding and laminating the outer cord fabric of the rubber expansion joint, first fill the gap formed between the reinforcement insertion pipe 6-2 of the rubber expansion joint installed in Step Seven, the surface of the inner cord fabric 9 of the rubber expansion joint and the foot of the reusable forming rubber mountain 13 with rubber strips (not shown in the figure), and then carry out the winding and lamination of the transition rubber in the same way and procedure as the inner layer rubber winding and lamination in Step Four, so as to form a good rubber transition layer between the reinforcement insertion pipe 6-2 of the rubber expansion joint matching flange assembly and the outer cord fabric layer 8 of the rubber expansion joint, and enhance the bonding force between the metal and the cord fabric layer; Complete the winding and lamination of the outer cord fabric 8 of the rubber expansion joint on the transition rubber layer after the above construction according to Step Six;

[0041] Step Nine: Winding and laminating the outer layer rubber of the rubber expansion joint; Complete the winding and lamination of the outer layer rubber 7 of the rubber expansion joint according to Step Four;

[0042] Step Ten: Exhausting, bandage shaping, and cotton rope compacting; Use an exhaust needle to punch holes for exhausting along the above-mentioned wound and laminated layer. The exhaust needle should ensure that it penetrates from the outermost layer of the outer layer rubber 7 of the rubber expansion joint to the innermost layer of the inner layer rubber 10 of the rubber expansion joint on the surface of the rubber expansion joint forming core tool 1, and ensure that the holes are evenly distributed along the circumferential surface, especially at the two feet of the reusable forming rubber mountain. The distribution density of the exhaust holes shall not be less than 10 per square decimeter. Start the rubber forming machine to rotate clockwise at a low speed, apply a pre-tightening force to the shaping water cloth bandage 11 and wind the water cloth bandage from the two feet of the reusable forming rubber mountain 13 towards the inside of the rubber expansion joint matching flange assembly 6 respectively, so that the gas in the rubber and cord fabric is extruded and exhausted in sequence. When winding, ensure that half of the next circle of the bandage is pressed on the previous circle of the bandage to ensure uniform exhaust. Maintain the shaping for 15 - 30 minutes according to the shaping process requirements, and then start the rubber forming machine to rotate counterclockwise at medium or high speed to remove and wind up the bandage; Start the rubber forming machine to rotate clockwise at a low speed, apply a pre-tightening force to the shaping water cloth bandage 11 and wind the water cloth shaping bandage or cotton bandage from the inside of the rubber expansion joint matching flange assembly 6 towards the other inside of the rubber expansion joint matching flange assembly in sequence. The figure only shows a schematic of one layer. When winding, ensure that half of the next circle of the bandage is pressed on the previous circle of the bandage; And arrange the high-temperature reusable shaping cotton ropes 12 closely in sequence on the formed bandage. When winding, ensure that the cotton ropes are arranged neatly, tightly, in a scattered and orderly manner, with distinct layers and appropriate tightness;

[0043] Step Eleven: Final fine-tuning of the fixed length and fixation; Connect the vulcanization limit pull rod 15 of the rubber expansion joint to the limit ear plate connection hole 6-4 on the limit ear plate 6-3 of the flange assembly 6 of the rubber expansion joint that is evenly distributed along the circumference of the flange assembly of the rubber expansion joint. Limit pull rod adjustment gaskets 16 and limit pull rod nuts 17 are arranged in sequence on the vulcanization limit pull rod 15 of the rubber expansion joint; Rotate the limit pull rod nut for dimensional fine-tuning and locking according to the product structure length required by the drawing, and use the forming side plate vulcanization positioning baffle 14 to closely adhere to the outer side of the rubber expansion joint forming side plate 5 along the circumferential surface of the rubber expansion joint forming core 1 for positioning and fixation;

[0044] Step Twelve: Overall secondary vulcanization in a vulcanizer; The rubber expansion joint formed by winding in the above Steps One to Eleven, together with the rubber expansion joint forming core tool, enters a direct steam pressurized vulcanizer for overall vulcanization. The specific implementation is as follows: heating and pressurizing → sewage discharge → primary heat preservation and pressure maintenance vulcanization → sewage discharge → secondary natural cooling and pressure reduction with low temperature and long time vulcanization → pressure relief and exhaust → cooling and discharging from the tank → demolding; The implementation method of heating and pressurizing: According to the vulcanization process requirements, fill the vulcanizer with high-temperature superheated or supersaturated steam based on the rubber type of the vulcanized product, variety specifications, vulcanizer equipment specifications, vulcanizing agent compounding method, etc., and heat and pressurize the tank body and product to a temperature of 133°C to 170°C and a pressure of 0.36 to 0.7 MPa according to the set heating rate or heating curve; Avoid overly rapid or slow heating and pressurizing. Overly rapid heating and pressurizing will cause impact damage to the product, make the rubber compound flow too fast to generate a large extrusion force that destroys the arrangement density of the cord fabric, generate bursting and piercing points, and reduce its compressive strength grade and service safety; Overly slow heating and pressurizing will reduce the rubber compounding vulcanization effect, prevent the complete release of the activity of the vulcanization accelerator and affect the final vulcanization depth, reduce the service performance of the rubber expansion joint, and deviate from its design performance; The implementation method of primary heat preservation and pressure maintenance vulcanization: Keep the temperature and pressure stable within 2 to 6 hours at the vulcanization temperature and pressure according to the designed vulcanization process standard; Excessive vulcanization temperature, excessive vulcanization pressure, and too long heat preservation and pressure maintenance time will cause the rubber to flow too fast or excessive extrusion to damage the arrangement density of the cord fabric to generate bursting and piercing points, over-vulcanization of the rubber expansion joint to reduce its physical properties, and excessive high temperature will cause shrinkage deformation or performance degradation of the cord with a not very high temperature resistance grade; Similarly, too low vulcanization temperature, too small vulcanization pressure, and too short heat preservation and pressure maintenance time will cause insufficient external pressing force for the vulcanized rubber expansion, resulting in defects such as lack of material, lack of rubber, and air bubbles on its surface. The rubber expansion joint fails to reach the correct vulcanization point (i.e., under-vulcanized in rubber terms), and its performance fails to reach the design performance, and the service performance decreases, affecting its compressive strength grade and service safety; The implementation method of secondary natural cooling and pressure reduction with low temperature and long time vulcanization: After the primary heat preservation and pressure maintenance vulcanization is completed, slowly cool down to 90°C and reduce the pressure to below 0.1 MPa according to the set cooling and vulcanization curve; The time depends on the vulcanizing agent compounding method. The main purpose of this stage of vulcanization is to completely release the vulcanizing agent, crosslinking agent, coupling agent, accelerator, activator, etc. in the rubber compounding to produce a significant combined effect, completely vulcanize the rubber, and prevent the self-vulcanization phenomenon of the uncompletely decomposed compounding agent during use or storage, which affects its service life. The base raw rubber is one or a combination of styrene-butadiene rubber, chloroprene rubber, ethylene propylene diene monomer rubber, butyl rubber, and nitrile rubber.

[0045] The reinforcing filler is one or a combination of N330 carbon black, N550 carbon black, and N660 carbon black.

[0046] The capacity-increasing filler is one or a combination of calcium carbonate, calcium bicarbonate, clay, bentonite, etc.

[0047] The filler is a wear-resistant filler, an anti-corrosion filler, and an anti-radiation filler. The process operation aids are one or a combination of a dispersant; a lubricant; a plasticizer; a tackifier; the dispersant is Gumix T-78A, carbon black; the lubricant is paraffin wax; the plasticizer is dibutyl phthalate, dioctyl phthalate, naphthenic oil, machine oil, aromatic oil; the tackifier is coumarone resin, rosin, phenolic resin.

[0048] The rubber protective aids are one or a combination of an antioxidant; an anti-ozonant; an anti-flex cracking agent; a light stabilizer; an ultraviolet light absorber; a harmful metal inhibitor; a mildew preventive; the antioxidant is antioxidant A, antioxidant D, antioxidant DNP; the anti-ozonant is antioxidant 4010, antioxidant 4010NA; the anti-flex cracking agent is antioxidant 4020, anti-cracking agent B-10; the light stabilizer is phosphite GW-540; the ultraviolet light absorber is 2-(2-hydroxy-5-methylphenyl) benzotriazole, 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole; the harmful metal inhibitor is antioxidant MB, antioxidant MBZ, antioxidant D, antioxidant 4010NA; the mildew preventive is sodium benzoate, mildew preventive N-(trichloromethylthio) phthalimide, docosahexaenoic acid.

[0049] The vulcanization activator is one or a combination of zinc oxide, magnesium oxide, stearic acid, calcium stearate, etc.

[0050] The vulcanizing agent is one or a combination of dicumyl peroxide vulcanizing agent DCP or diallyl phthalate crosslinking agent TAIC; sulfur or insoluble sulfur.

[0051] The vulcanization accelerator is one or a combination of diphenyl guanidine, dibenzothiazole disulfide, 2-mercaptobenzothiazole, N-cyclohexyl-2-benzothiazole sulfenamide, tetramethylthiuram disulfide, 1,2-ethylenethiourea, etc. Example

[0052] 100 parts of styrene-butadiene rubber; 30 parts of N330; 15 parts of calcium bicarbonate, 5 parts of clay; 10 parts of wear-resistant filler, 12 parts of anti-corrosion filler, 8 parts of anti-radiation filler; 8 parts of plasticizer; 5 parts of zinc oxide; 2.5 parts of stearic acid; 2.8 parts of physical antioxidant; 2.2 parts of sulfur; 1.8 parts of vulcanization accelerator.

[0053] During specific implementation, the chemical cleaning tackifier in the preparation method includes varieties such as gasoline, toluene, xylene, ethyl acetate, acetic acid ethyl ester, etc.

[0054] In the preparation method, the inner and outer cord fabrics include but are not limited to various cord fabrics or bead wires such as polyester cord fabric, nylon cord fabric, aramid cord fabric, etc., with different warp and weft arrangement densities, wire diameters, etc.

[0055] In the preparation method, the preformed calendered cord fabric generally includes natural rubber calendered cord fabric or calendered reinforcing fabric, and also includes calendered cord fabric or calendered reinforcing fabric of other rubber types such as ethylene propylene diene monomer (EPDM) rubber, silicone rubber, fluororubber, etc.

[0056] In the preparation method, the inner rubber layer is a multi-layer preformed rubber sheet, including a single-layer thin preformed rubber sheet or a single layer formed by winding a combination of multi-layer thin sheets (after mechanical degassing and mechanical bonding treatment).

[0057] In the preparation method, the inner and outer cord fabric layers of the rubber expansion joint include but are not limited to combinations of various cutting and fitting angles (generally 30° - 60°, etc.) with multiple even layers. For the same layer, one or several overlapping construction methods can be used, but it is not allowed at the same position between each layer, and it should be evenly distributed around the circumference basically.

[0058] In the preparation method, cleaning and tackifying with an interlayer chemical cleaner is a key quality control process, which plays a crucial role in controlling defects such as rubber vulcanization bubbles, delamination, and peeling.

[0059] In the preparation method, the regular winding and forming of the cord fabric by cutting at an angle and alternating front and back, as well as the control of vulcanization temperature and pressure, are related to the regularity and density of the cord fabric arrangement. They are the key steps to ensure that it is not damaged during construction and that the rubber is not extruded and punctured by the vulcanization external force, which is directly related to the compressive strength grade, service safety, and reliability of the rubber expansion joint.

[0060] The technical advantages and principles of the present invention over ordinary molded or pressure-injected molded expansion joints:

[0061] 1) The rubber layer is formed by winding and laminating multi-layer thin preformed rubber sheets (already treated by mechanical degassing and impurity removal on the surface). Defects in the process are eliminated before vulcanization for each layer, such as exhaust, cleaning, tackifying, and shaping. While ordinary molded or pressure-injected molded expansion joints use a whole rubber sheet to fill the mold cavity, and the bubbles or impurities trapped in it are likely to generate bubbles and cannot be discharged before or during vulcanization.

[0062] 2) In the preparation method, multiple processes of exhaust are carried out to eliminate bubble defects before vulcanization, ensuring that there are basically no defects inside the product after forming and vulcanization, and controlling surface micro-defects (such as repairable bubbles and material shortages) below 2%, improving the first-pass rate of the product.

[0063] 3) Use preformed friction calendered cord fabric to ensure that the longitude and latitude arrangement is not disordered during its construction. The front and back of the cord are alternately wound and laminated to form a uniformly distributed grid-like arrangement. Slowly heat and pressurize to make the rubber more uniform, without causing interlayer extrusion to break through and damage the grid arrangement of the cord fabric, and there are no obvious bursting and piercing points; the compressive strength grade is higher and the uniformity is good; in the ordinary molded or pressure-injected molded expansion joint, the cord fabric fills the mold cavity irregularly and is disordered during mold cavity filling. The clamping force generated instantaneously during mold clamping makes the rubber generate a strong extrusion force, which easily extrudes and pierces the interlayer arrangement of the cord fabric to fill the mold cavity. In this way, during the vulcanization process, the interlayer compressive strength of the cord fabric is reduced, and bursting and piercing points are formed, greatly affecting its compressive strength grade and uniformity.

[0064] 4) For ordinary molded or pressure-injected molded expansion joints, high-temperature rapid vulcanization often easily causes over-vulcanization due to the rapid release of accelerators or activators, or over-vulcanization occurs in the part of the rubber in contact with the mold due to the excessive thickness of the rubber. However, the middle part of the rubber fails to reach the vulcanization temperature due to slow temperature transfer, resulting in under-vulcanization in the middle, causing self-vulcanization of the rubber expansion joint during use or storage, which affects its design performance, service performance, and service life; in the preparation method, a suitable heating curve, first-stage heat preservation and pressure-holding vulcanization, and second-stage natural temperature and pressure reduction vulcanization are designed according to the compounding method of the vulcanizing agent, so that the temperature of the inner and outer surfaces of the rubber reaches uniformity within a sufficient time, and the vulcanizing agent, activator, accelerator, cross-linking agent, etc. are completely released, and their interaction makes the vulcanization more thorough, with basically no over-vulcanization or under-vulcanization phenomena. Since the vulcanizing agent and its compounding agents can be completely released and decomposed during the vulcanization process, good service performance is formed during the vulcanization process, and its service life is improved.

[0065] The present invention is applicable to the fields of nuclear power, chemical safety, ships, marine transportation, fields above medium and high pressure, and fields with high requirements for operation reliability, safety, and performance.

[0066] The above embodiments of the present invention are merely examples clearly illustrating the present invention and are not used to limit the protection scope of the present invention. All equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention shall be defined by each claim.

Claims

1. A manufacturing method for winding and forming a rubber expansion joint, characterized in that The rubber expansion joint is made of the following components in parts by weight: 100 parts of basic raw rubber or 100 - 150 parts of oil - filled basic raw rubber; 20 - 60 parts of reinforcing filler; 10 - 40 parts of volume - increasing filler; 5 - 35 parts of special filler, and the special filler is wear - resistant filler, anti - corrosion filler, anti - radiation filler; 5 - 25 parts of process operation aid; 2 - 8 parts of vulcanization activator; 0.5 - 4.5 parts of rubber protective aid; 0.2 - 5.0 parts of vulcanizing agent; 0.1 - 2.5 parts of vulcanization accelerator; Its manufacturing method includes the following steps: Step 1: Add rubber raw rubber and various rubber compounding agents, and mix them into various rubber compounded rubber colloids with processing performance through a rubber mixing equipment Weigh and add them into a rubber internal mixer according to the fixed - type formula ratio confirmed by the process, and carry out pressure internal mixing to mix into various rubber compounded rubber colloids; Step 2: Preparation of pre - formed rubber sheet The rubber compounded rubber colloid processed in Step 1 goes through filter purification → extrusion and drawing → cooling to 5℃ - 35℃ → long pin - type cold feed extrusion → duck - bill extrusion → pressing by a two - roll calender → receiving and air cooling → four - roll cooling to 35℃ - 45℃ → tension - free coiling → preparation of the pre - formed rubber sheet for the rubber expansion joint; Step 3: Preparation of pre - formed rubber - coated cord fabric Prepare the rubber compounded rubber colloid for rubber - coating the cord fabric according to the method and formula ratio in Step 1. After passing through the open mill for sheet making → isolation with isolation liquid → air duct transportation and cooling → slicing → feeding into a four - roll calender → tensioning of the impregnated cord fabric → double - sided rubber - coating of the impregnated cord fabric → isolation with backing cloth → pre - tightening and coiling → pre - formed rubber - coated cord fabric; Step 4: Winding and laminating forming of the inner rubber sheet 1) Calculate the cutting size, forming thickness and forming layers of the inner rubber (10) of the rubber expansion joint according to the size of the reusable forming rubber mountain (13) in the rubber expansion joint forming die and the product structure length as required by the design drawing and the process construction, and cut the preformed rubber sheet obtained in the second step; 2) At the starting point of the preformed rubber sheet after cutting in the above 1), use a process exhaust needle to fix it on both sides of the reusable forming rubber mountain (13) respectively along the middle of both sides of the winding and forming preformed rubber sheet. Start the rubber expansion joint forming machine and rotate the rubber expansion joint forming core (1) clockwise at a low speed. Stop rotating when it reaches the starting point. Apply a chemical cleaning and tackifying agent to the outer surface within a range of 10 mm at the starting point of the preformed rubber sheet, then carry out joint overlapping, and roll and compact it along the overlapping part with a roller. At the same time, press and compact the bottom of both sides of the reusable forming rubber mountain (13) with a roller. Start the rubber expansion joint forming machine and rotate the rubber expansion joint forming core (1) clockwise at a medium or low speed. Wrap the wound and formed preformed rubber sheet outward from the bottom of both sides of the reusable forming rubber mountain (13) with a water wrap cloth bandage (11) same as the shaping water wrap cloth bandage. When wrapping, ensure that 1 / 2 - 1 / 3 of the next layer of the bandage is pressed on the previous layer of the bandage, and ensure that the bandage is tightly pressed when wrapping to make it well-shaped and exhaust. Stop the rubber expansion joint forming machine after winding. Complete the shaping time of 15 - 30 minutes according to the specification requirements. Start the rubber expansion joint forming machine and rotate the rubber expansion joint forming core (1) counterclockwise at a high speed to remove and wind up the shaping bandage, wipe the surface to make it dry, and apply a chemical reagent to clean and remove surface impurities and increase tackiness; Step Five: Marking and Isolation Calculate the flanging and fitting parts of the rubber expansion joint according to the product structure length required by the design drawing and the construction process requirements; use a marker pen to draw a circumferential line along the appropriate symmetric parts on both sides of the forming rubber mountain (13) for marking, and apply isolation powder to the rubber surface of the parts outside the marking line that need to be flanged and fitted by patting with an isolation bag. Clean and increase the tackiness of the rubber surface inside the marking line that is contaminated by the isolation powder with a chemical cleaning agent; Step Six: Winding, Laying and Forming of Inner Reinforcing Cord Fabric Calculate the cutting size of the preformed calendered cord fabric obtained in the third step according to the product structure length required by the design drawing and the construction process requirements. Calculate the cutting and trimming angle of 30° - 60° of the preformed calendered cord fabric obtained in the third step according to the rubber mountain structure, compressive strength grade and construction process method of the rubber expansion joint. According to the cutting angle, perimeter size and the inner cord fabric (9) of the rubber expansion joint required by the construction process requirements, cut the required number of calendered cord fabrics according to the width of the preformed calendered cord fabric obtained in the third step; The preformed friction calendered cord fabric after blanking is wound and laminated according to the manufacturing process method in Step 4. Each adjacent two layers are wound and laminated in a positive and negative symmetric alternating manner according to the cutting angle, forming a compressive layer with the warp of the cord fabric arranged densely at approximately 90°. The same pressing roller as in Step 4 is used to press and compact its surface and the bottom parts of both feet of the reusable forming rubber mountain (13). For the bottom parts of both feet of the reusable forming rubber mountain (13) on both sides of the inner cord fabric of the two adjacent layers at the bottom layer after forming, cord fabric strips with a width of 2.5 - 25 mm are respectively used to apply a pre-tightening force, and the rubber expansion joint forming machine is started to rotate clockwise at a low speed for winding, tightening and compacting. The winding and forming operations of the remaining inner friction calendered cord fabric layers are carried out according to the above requirements until the required number of winding and forming cord fabric layers meets the requirements of the drawing and construction process, forming the inner cord fabric (9) of the rubber expansion joint, including all the inner winding and forming cord fabric layers; multi-layer lamination is adopted, that is, adjacent two layers are wound and laminated in a positive and negative alternating manner according to the cutting angle. The lap joints of each layer of formed cord fabric are distributed approximately symmetrically and evenly in the circumferential direction. Each layer cannot be at the same position, and the lap width is about 5 - 15 mm; every two layers of cord fabric are pressed, shaped, exhausted and removed in the same winding and pressing manner as in 11 - shaping bandage in Step 5; the number of winding and forming layers of the cord fabric can only be an even number to ensure that the warp of the cord fabric is arranged densely at approximately 90° to form a good compressive layer. Marking and isolation are carried out between every two layers of cord fabric in the manner shown in Step 5; after all the inner cord fabric (9) of the rubber expansion joint is wound and formed, cord fabric strips with a width of 5 - 30 mm are respectively used to apply a pre-tightening force to the bottom parts of both feet of the reusable forming rubber mountain (13) after forming, and the rubber expansion joint forming machine is started to rotate clockwise at a low speed for winding, tightening and compacting. Step 7. Installation of the flange assembly for the rubber expansion joint Loosen the connecting bolts (4) and nuts (3) between the rubber expansion joint forming side plate (5) on the rubber expansion joint forming core (1) and the rubber expansion joint supporting flange assembly (6). Try to fit the reinforcing insertion tube (6 - 2) of the rubber expansion joint supporting flange assembly of the rubber expansion joint supporting flange assembly (6) onto the inner rubber (10) of the rubber expansion joint and the layer of the inner cord fabric (9) of the rubber expansion joint that has been wound and formed qualified. Determine the adjustment with the intermediate rubber according to the fitting gap to make it a gapless fit, and carry out the sizing installation of the rubber expansion joint supporting flange assembly (6) according to the product structure length requirements. Seal surface transition rubber bonding is carried out according to the seal structure type and seal surface size of the flange assembly (6) supporting the rubber expansion joint. The surface of the tackifying transition rubber and the surface of the turned-up cord fabric are cleaned with a chemical cleaning agent, and the turned-up bonding of every two layers of cord fabric is carried out respectively; during this period, the surface with separating powder is soaked and cleaned with a chemical cleaning agent, tackified and turned-up and bonded until all the cord fabric (9) and the inner layer rubber (10) of the rubber expansion joint are turned-up and bonded. The forming side plate (5) of the rubber expansion joint is closely bonded to the flange assembly (6) supporting the rubber expansion joint after turned-up bonding, so that the center of the connecting bolt holes (6-1) of the flange assembly and the connecting bolt holes (5-1) of the forming side plate of the rubber expansion joint are on the same straight line. Special punching dies and punching tools suitable for the connecting bolt holes are used to punch all the bolt holes to remove the rubber blocking the screw holes, and special perforated pipe plugs are sleeved to prevent the rubber from flowing into the screw holes during vulcanization, resulting in lack of rubber in the rubber seal surface and difficulty in cleaning the rubber entering the screw holes. According to the process requirements, the connecting bolts (4), adjusting gaskets (2) and nuts (3) are used to connect and fasten symmetrically along the circumference of the flange. When the bolts are tightened, a little rubber overflows from the outer circumference of the flange assembly supporting the rubber expansion joint to ensure that there is no lack of rubber defect during the vulcanization process; Step Eight: Winding and Molding of the Outer Cord Fabric of the Rubber Expansion Joint Calculate the blanking size of the preformed rubberized cord fabric obtained in Step Three according to the product structure length and construction process requirements. Calculate the cutting angle of 30°-60° of the preformed rubberized cord fabric obtained in Step Three according to the rubber mountain structure, compressive strength grade and construction process method of the rubber expansion joint. According to the cutting angle, perimeter size and the outer cord fabric (8) of the rubber expansion joint required by the construction process requirements, blank and cut the required number of rubberized cord fabrics according to the width of the preformed rubberized cord fabric obtained in Step Three; Before the winding and molding of the outer cord fabric of the rubber expansion joint, first fill the gap formed between the reinforcing insertion pipe (6-2) of the flange assembly supporting the rubber expansion joint installed in Step Seven and the surface of the inner cord fabric (9) of the rubber expansion joint and the foot of the reused forming rubber mountain (13) with rubber strips, and then carry out the winding and molding of the transition rubber according to the winding and bonding method and procedure of the inner layer rubber in Step Four, so as to form a good rubber transition layer between the reinforcing insertion pipe (6-2) of the flange assembly supporting the rubber expansion joint and the outer cord fabric (8) layer of the rubber expansion joint and enhance the bonding force between the metal and the cord fabric layer; Complete the winding and molding of the outer cord fabric (8) of the rubber expansion joint on the transition rubber layer after the above construction according to Step Six; Step Nine: Winding and Molding of the Outer Layer Rubber of the Rubber Expansion Joint Complete the winding and molding of the outer layer rubber (7) of the rubber expansion joint according to Step Four; Step Ten: Exhausting, Bandage Shaping, and Cotton Rope Compacting Use an exhaust needle to punch holes and exhaust air along the above-mentioned wound and formed layer. Ensure that the exhaust needle penetrates from the outermost layer of the outer rubber (7) of the rubber expansion joint to the surface of the rubber expansion joint forming core tool (1) at the innermost layer of the inner rubber (10) of the rubber expansion joint, and ensure uniform distribution along the circumferential surface. At the foot of both sides of the reusable forming rubber mountain, the distribution density of the exhaust holes shall not be less than 10 per square decimeter. Start the rubber forming machine and rotate it clockwise at a low speed. Apply a pre-tightening force to the shaped water wrap bandage (11) and wind the water wrap bandage from the foot of both sides of the reusable forming rubber mountain (13) to the inside of the rubber expansion joint matching flange assembly (6) in sequence to extrude and discharge the gas of the rubber and cord fabric outwards in order. When winding, ensure that half of the next circle of the bandage is pressed on the previous circle of the bandage to ensure uniform exhaust. Keep the shaping for 15 - 30 minutes according to the shaping process requirements. Start the rubber forming machine and rotate it counterclockwise at medium or high speed to remove and wind up the bandage; Start the rubber forming machine and rotate it clockwise at a low speed. Apply a pre-tightening force to the shaped water wrap bandage (11) and wind the shaped water wrap bandage or cotton bandage from the inside of the rubber expansion joint matching flange assembly (6) to the other inside of the rubber expansion joint matching flange assembly in sequence. When winding, ensure that half of the next circle of the bandage is pressed on the previous circle of the bandage; and closely arrange the high-temperature resistant reusable shaping cotton ropes (12) on the formed bandage in sequence. When winding, ensure that the cotton ropes are arranged neatly, tightly, in a scattered and orderly manner, with distinct layers and appropriate tightness; Step Eleven: Final fine-tuning of the fixed length and fixation Connect the rubber expansion joint vulcanization limit pull rod (15) to the limit ear plate connection hole (6 - 4) on the limit ear plate (6 - 3) of the rubber expansion joint matching flange assembly which is evenly distributed along the circumference of the rubber expansion joint matching flange assembly (6). Arrange the limit pull rod adjusting gasket (16) and the limit pull rod nut (17) on the rubber expansion joint vulcanization limit pull rod (15) in sequence; Rotate the limit pull rod nut for size fine-tuning and locking according to the product structure length required by the drawing. Use the forming side plate vulcanization positioning baffle (14) to closely adhere to the outside of the rubber expansion joint forming side plate (5) along the circumferential surface of the rubber expansion joint forming core tool (1) for positioning and fixation; Step Twelve: Overall vulcanization in the vulcanization tank for the second stage The rubber expansion joint formed by winding in the above-mentioned Steps One to Eleven together with the rubber expansion joint forming core tool enters the direct steam pressurized vulcanization tank for overall vulcanization. The specific implementation is as follows: heating up, boosting pressure → discharging sewage → primary heat preservation and pressure maintaining vulcanization → discharging sewage → secondary natural cooling and pressure reduction with low temperature and long time vulcanization → pressure relief and exhaust → cooling and taking out of the tank → demoulding.

2. The manufacturing method of winding and forming a rubber expansion joint according to claim 1, characterized in that: The basic raw rubber is one or a combination of styrene-butadiene rubber, chloroprene rubber, ethylene propylene diene monomer rubber, butyl rubber, and nitrile rubber.

3. A manufacturing method for winding and forming a rubber expansion joint according to claim 1, characterized in that: The reinforcing filler is one or a combination of N330 carbon black, N550 carbon black, and N660 carbon black.

4. A manufacturing method for winding and forming a rubber expansion joint according to claim 1, characterized in that: The volume increasing filler is one or a combination of calcium carbonate, calcium bicarbonate, kaolin, and bentonite.

5. A manufacturing method for winding and forming a rubber expansion joint according to claim 1, characterized in that: The process operation aids are one or a combination of a dispersant; a lubricant; a plasticizer; a tackifier; the dispersant is Gumix T-78A, carbon black; the lubricant is paraffin wax; the plasticizer is dibutyl phthalate, dioctyl phthalate, naphthenic oil, machine oil, aromatic oil; the tackifier is coumarone resin, rosin, phenolic resin.

6. A manufacturing method for winding and forming a rubber expansion joint according to claim 1, characterized in that: The rubber protection aids are one or a combination of an antioxidant; an anti-ozonant; a flex-cracking inhibitor; a light stabilizer; an ultraviolet absorber; a harmful metal inhibitor; a mildew preventive; the antioxidant is antioxidant A, antioxidant D, antioxidant DNP; the anti-ozonant is antioxidant 4010, antioxidant 4010NA; the flex-cracking inhibitor is antioxidant 4020, anti-cracking agent B-10; the light stabilizer is phosphite GW-540; the ultraviolet absorber is 2-(2-hydroxy-5-methylphenyl)benzotriazole, 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole; the harmful metal inhibitor is antioxidant MB, antioxidant MBZ, antioxidant D, antioxidant 4010NA; the mildew preventive is sodium benzoate, mildew preventive N-(trichloromethylthio)phthalimide, docosahexaenoic acid.

7. A manufacturing method for winding and forming a rubber expansion joint according to claim 1, characterized in that: The vulcanization activator is one or a combination of zinc oxide, magnesium oxide, stearic acid, calcium stearate.

8. A manufacturing method for winding and forming a rubber expansion joint according to claim 1, characterized in that: The vulcanizing agent is dicumyl peroxide vulcanizing agent DCP or diallyl phthalate crosslinking agent TAIC; one or a combination of ordinary sulfur or insoluble sulfur.

9. A manufacturing method for winding and forming a rubber expansion joint according to claim 1, characterized in that: The vulcanization accelerator is one or a combination of diphenyl guanidine, dibenzothiazole disulfide, 2-mercaptobenzothiazole, N-cyclohexyl-2-benzothiazole sulfenamide, tetramethylthiuram disulfide, 1,2-ethylenethiourea.

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