Valve body assembly structure and machining method

Abstract

According to the valve body assembly structure and the processing method, the valve body assembly structure is used for vulcanizing 3180T rubber in valve body parts, the gas sealing requirement of a valve body and a valve seat under certain working pressure is met, meanwhile, the rubber does not fall off from the valve body, and the surface of the rubber is smooth and flat. The method comprises the following steps: carrying out sand blasting treatment on a vulcanization area of the valve body part before vulcanization; valve body parts are cleaned and aired after sand blasting, and oil stains inside and outside the valve body are removed; adhesive is uniformly coated on the vulcanization area of the valve body and dried, and the adhesive is uniformly stirred before being coated; refining rubber and discharging sheets; mold preheating and valve body part preheating; adding a sizing material, closing the mold and vulcanizing; and demolding to remove flash and burrs. According to the invention, the valve body part and the 3180T rubber can be effectively vulcanized to form the valve body assembly, and the valve body assembly can meet the requirements of product technical conditions.

Description

Technical Field

[0001] The invention belongs to the field of manufacturing a balance valve mechanism of a pressure reducer, and in particular relates to a valve body component structure and a processing method. Background Art

[0002] The valve body assembly is a component in the balanced valve mechanism of the oxygen pressure reducer. The traditional valve body assembly structure is generally annular groove. The valve body assembly is vulcanized with 3180T rubber compound or artificially bonded rubber pads in the annular groove area of ​​the metal valve body to achieve the gas sealing requirements of the balanced valve mechanism.

[0003] The processing method of valve body components generally adopts the manual bonding method, and the glue used is aviation rubber liquid XY401. The main disadvantages of the manual bonding method are high labor intensity of the operator, low production efficiency and short service life. There is also a method of vulcanization processing. When vulcanization, the adhesive usually used is a single-component MEGUM14550. The valve body components bonded with a single-component adhesive have a short service life and the glue is easy to fall off. Summary of the invention

[0004] The present invention provides a valve body assembly structure and a processing method, which solves the problem of low service life of the traditional valve body annular groove structure and manual bonding, solves the problem of high labor intensity and low production efficiency of manual bonding operators, and improves the service life of the valve body assembly after vulcanization.

[0005] The technical solution of the present invention is:

[0006] The first aspect of the present invention provides a valve body assembly structure, the valve body assembly structure comprising: a valve body 1 and a 3180T rubber material 2, wherein:

[0007] A trapezoidal annular groove is provided on the top end surface of the valve body 1 as a vulcanization area, and the depth of the trapezoidal annular groove is 5 mm;

[0008] 3180T rubber compound 2 is filled in the trapezoidal ring groove.

[0009] A second aspect of the present invention provides a method for processing the door assembly structure as in the first aspect, the method comprising the following steps:

[0010] Step 1: Sandblast the vulcanization area of ​​the valve body parts before vulcanization;

[0011] Step 2: After sandblasting, clean and dry the valve body parts, and remove the oil stains inside and outside the valve body parts;

[0012] Step 3: Apply adhesive evenly on the vulcanized area of ​​the valve body and let it dry. Stir the adhesive evenly before applying.

[0013] Step 4: Rubber refining;

[0014] Step 5: Preheating the mold and valve body parts;

[0015] Step 6: Add rubber, close the mold and vulcanize;

[0016] Step 7: De-mould and remove burrs.

[0017] Optionally, the valve body 1 is machined from a stainless steel 0Cr13Ni8Mo2Al-H510 bar, and the steel is chemically passivated after forming.

[0018] Optionally, in the step 1, a sandblasting machine is used to sandblast the trapezoidal annular groove area of ​​the valve body to increase the roughness of the inner part of the trapezoidal annular groove so as to increase the bonding force between the metal matrix and the rubber material;

[0019] When sandblasting, use a protective fixture to protect the area other than the trapezoidal ring groove to ensure that the roughness of the remaining area does not change;

[0020] The sandblasting process parameters are set as follows: the air pressure of the sandblasting machine is 0.3MPa~0.4MPa, and the sand particle size is 40#~50#;

[0021] After sandblasting is completed, use compressed air to blow away the residual sand in the trapezoidal ring groove and the vent hole.

[0022] Optionally, in the step 2, the valve body parts after sandblasting are immersed in anhydrous ethanol, taken out after immersion for 60 minutes, and dried at room temperature for at least 5 minutes.

[0023] Optionally, in step 3, the adhesive used is CHEMLOK205 and CHEMLOK220 two-component heat-vulcanized adhesive;

[0024] First, use a soft brush to apply CHEMLOK205 adhesive evenly to the trapezoidal ring groove area and let it dry at room temperature for 40 minutes;

[0025] Use a soft brush to dip CHEMLOK220 adhesive and evenly apply it to the trapezoidal ring groove area, and let it dry at room temperature for 50 minutes;

[0026] The valve body parts should be placed with the trapezoidal ring groove facing upwards;

[0027] The valve body coated with adhesive will be vulcanized within 24 hours.

[0028] Optionally, in the step 4, the rubber material is rolled and thinned for 5 times, and then re-refined and smoothed to obtain a sheet with a thickness of 2 mm for later use.

[0029] Optionally, in step five, the surface roughness of the mold mating surface is not greater than 0.4, the mold is preheated to 151°C ± 2°C and maintained for at least 20 minutes, then the valve body is installed and preheated for another 1 minute.

[0030] Optionally, in step six, vulcanization is performed using a vacuum vulcanizer;

[0031] The vulcanization process parameters are as follows: vulcanization pressure 7MPa~10MPa, vulcanization temperature 151℃±2℃, vulcanization time 20min;

[0032] After the mold cools down naturally, remove it from the mold.

[0033] Optionally, in step seven, use a scraper to manually remove excess rubber around the rubber surface without damaging the rubber surface and polishing the rubber surface is not allowed.

[0034] The advantages of the present invention are: the use of the valve body assembly structure and processing method described in the present invention has the following significant advantages: 1. reducing the labor intensity of the operator; 2. improving production efficiency; 3. increasing the service life of the valve body assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0036] Figure 1 A schematic diagram of the structure of the valve body assembly provided by the present invention;

[0037] Description of reference numerals:

[0038] 1-The valve body;

[0039] 2-3180T rubber material. DETAILED DESCRIPTION

[0040] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with the embodiments. The following text is only used to describe one or several specific implementations of the present invention, and does not strictly limit the protection scope of the specific claims of the present invention.

[0041] The present invention provides a valve body structure and a valve body assembly processing method, comprising the following contents and steps:

[0042] The valve body assembly shell structure adopts a trapezoidal ring groove structure, and a vacuum vulcanizer is used to vulcanize 3180T rubber into the valve shell to form the valve body assembly.

[0043] The valve body parts are made of stainless steel 0Cr13Ni8Mo2Al-H510 bars and then chemically passivated. The rubber is 3180T.

[0044] Before vulcanization, the vulcanization area of ​​the valve body parts is sandblasted. The sandblasting machine is set to an air pressure of 0.3MPa to 0.4MPa, and the sand particle size is 40# to 50#.

[0045] After sandblasting, clean and dry the valve housing parts, and remove the oil stains inside and outside the valve housing;

[0046] Apply adhesive evenly on the vulcanization area of ​​the valve body shell and let it dry. Stir the adhesive evenly before applying; the valve body coated with adhesive should complete mold vulcanization within 24 hours.

[0047] 3180T rubber compound is refined and produced into sheets, and mold vulcanization is completed within 24 hours after production.

[0048] Preheat the vulcanization mold and valve body parts;

[0049] Put the rubber into the mold, close the mold and vulcanize;

[0050] After the mold cools down naturally, demould it and remove the burrs.

[0051] A vacuum vulcanizer is used for vulcanization. The vulcanization technical parameters are: vulcanization pressure 7MPa~10MPa, vulcanization temperature 151℃±2℃, and vulcanization time 20min.

[0052] In view of the problems existing in the prior art, the valve assembly structure uses a trapezoidal annular groove instead of an annular groove, reduces the risk of rubber falling off from the design source, and uses two-component CHEMLOK205 and CHEMLOK220 adhesives to improve the bonding strength (tests have shown that the bonding strength of the two-component adhesive is 3 to 5 times that of the single-component adhesive), thereby increasing the service life of the valve assembly. The use of the vulcanization process can reduce the labor intensity of the operator and improve production efficiency. The present invention can solve this process and technical problem.

[0053] This embodiment provides a trapezoidal annular groove valve body structure and a valve body assembly processing method. The process method includes: sandblasting the vulcanization area of ​​the valve body parts before vulcanization; cleaning and drying the valve body parts after sandblasting to remove oil stains inside and outside the valve body; evenly applying adhesive to the vulcanization area of ​​the valve body and drying; mixing rubber to produce sheets; preheating the mold and the valve body parts; and using a vacuum vulcanizer to close the mold for vulcanization.

[0054] In this embodiment, the valve body parts are made of stainless steel 0Cr13Ni8Mo2Al-H510 bars and then chemically passivated.

[0055] In this embodiment, sandblasting is performed on the trapezoidal ring groove area of ​​the valve body to increase the roughness of the inner part of the trapezoidal ring groove so as to increase the bonding force between the metal matrix and the rubber material. When sandblasting, a protective fixture is used to protect the area other than the trapezoidal ring groove to ensure that the roughness of the remaining areas does not change and the appearance quality is not affected. The sandblasting process parameters are set as follows: the air pressure of the sandblasting machine is 0.3MPa~0.4MPa, and the sand grain size is 40#~50#. After sandblasting, use compressed air to blow away the residual sand grains in the trapezoidal ring groove. Before sandblasting, check whether the number of the protective fixture is correct. After sandblasting, check the surface quality of the sandblasting area to ensure that the sandblasting area is uniform and matte, and there is no excess sand grains remaining in the trapezoidal ring groove.

[0056] In this embodiment, the valve body parts after sandblasting are immersed in anhydrous ethanol for 60 minutes, taken out, and air-dried for at least 5 minutes in a room temperature environment with an ambient temperature of 0° C. to 28° C. and a humidity of no more than 80%.

[0057] In this embodiment, the adhesive used is CHEMLOK 205 and CHEMLOK 220 two-component heat-vulcanized adhesive. The adhesive should be stirred evenly before use.

[0058] First, use a soft brush to dip CHEMLOK205 adhesive and evenly apply it to the trapezoidal ring groove area, and let it dry at room temperature for 40 minutes.

[0059] Then use a soft pen to dip CHEMLOK220 adhesive and evenly apply it to the trapezoidal ring groove area, and let it dry at room temperature for 50 minutes.

[0060] The valve body parts should be placed with the trapezoidal ring groove facing upwards. The temperature at the site should be between 0℃ and 28℃, and the humidity should not exceed 80%. Do not touch the trapezoidal ring groove area after the glue is applied.

[0061] In this embodiment, the valve body coated with adhesive is molded and vulcanized within 24 hours.

[0062] In this embodiment, the rubber material is rolled and thinned for 5 times, and then re-refined and smoothed to produce a sheet (thickness 2mm) for standby use. The mold vulcanization is completed within 24 hours after the sheet is produced.

[0063] In this embodiment, the surface roughness of the mold joint surface is not greater than 0.4 to ensure that the surface of the rubber surface after vulcanization is smooth and flat and meets the airtightness requirements.

[0064] Preheat the mold to 151℃±2℃ and keep it for at least 20 minutes, then install the valve body and preheat it again for 1 minute.

[0065] In this embodiment, a vacuum vulcanizer is used for vulcanization, and the vulcanization process parameters are set as follows: vulcanization pressure 7MPa-10MPa, vulcanization temperature 151°C±2°C, and vulcanization time 20min.

[0066] Taking the valve assembly processing as an example, the main process is as follows:

[0067] (1) Check the sandblasting protection fixture number and certificate;

[0068] (2) Sandblasting of the vulcanized area of ​​the valve body parts;

[0069] (3) Check the surface quality of the sandblasting area;

[0070] (4) Clean and dry the valve body parts;

[0071] (5) Apply adhesive to the vulcanized area of ​​the valve body parts;

[0072] (6) Check the quality of adhesive application;

[0073] (7) Rubber refining;

[0074] (8) Check the vulcanization mold number and certificate;

[0075] (9) Preheating the mold and valve body parts;

[0076] (10) Molding vulcanization;

[0077] (11) Check the vulcanization process parameters;

[0078] (12) Pressure relief and demoulding;

[0079] (13) Check the vulcanization quality;

[0080] (14) Deburring;

[0081] (15) Check the appearance quality of the valve body assembly;

[0082] Qualified parts will go through the warehousing procedures.

[0083] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A valve assembly structure, characterized in that: The valve body assembly structure comprises: a valve body (1) and 3180T rubber material (2), wherein: A trapezoidal annular groove is arranged on the top end surface of the valve body (1) as a vulcanization area, and the depth of the trapezoidal annular groove is 5 mm; The 3180T rubber compound (2) is filled in the trapezoidal ring groove.

2. A method for processing a door assembly structure as claimed in claim 1, characterized in that: The method comprises the following steps: Step 1: Sandblast the vulcanization area of ​​the valve body parts before vulcanization; Step 2: After sandblasting, clean and dry the valve body parts, and remove the oil stains inside and outside the valve body parts; Step 3: Apply adhesive evenly on the vulcanized area of ​​the valve body and let it dry. Stir the adhesive evenly before applying. Step 4: Rubber refining; Step 5: Preheating the mold and valve body parts; Step 6: Add rubber and close the mold for vulcanization; Step 7: Demould and remove burrs.

3. The processing method according to claim 2, characterized in that: The valve body (1) is machined from stainless steel 0Cr13Ni8Mo2Al-H510 bars, and the steel is chemically passivated after forming.

4. The processing method according to claim 2, characterized in that: In the step 1, a sandblasting machine is used to sandblast the trapezoidal annular groove area of ​​the valve body to increase the roughness of the inner part of the trapezoidal annular groove so as to increase the bonding force between the metal matrix and the rubber material; When sandblasting, use a protective fixture to protect the area other than the trapezoidal ring groove to ensure that the roughness of the remaining area does not change; The sandblasting process parameters are set as follows: the air pressure of the sandblasting machine is 0.3MPa~0.6MPa, and the sand particle size is 40#~50#; After sandblasting, use compressed air to blow away the remaining sand in the trapezoidal ring groove and vent holes.

5. The processing method according to claim 2, characterized in that: In the step 2, the valve body parts after sandblasting are immersed in anhydrous ethanol, taken out after immersion for 60 minutes, and dried in the room temperature environment for at least 5 minutes.

6. The processing method according to claim 2, characterized in that: In the step 3, the adhesive used is CHEMLOK205 and CHEMLOK220 two-component heat-vulcanized adhesive; First, use a soft brush to apply CHEMLOK205 adhesive evenly to the trapezoidal ring groove area and let it dry at room temperature for 40 minutes; Use a soft brush to dip CHEMLOK220 adhesive and evenly apply it to the trapezoidal ring groove area, and let it dry at room temperature for 50 minutes; The valve body parts should be placed with the trapezoidal ring groove facing upwards; The valve body coated with adhesive is molded and vulcanized within 24 hours.

7. The processing method according to claim 2, characterized in that: In the step 4, the rubber material is rolled and thinned for 5 times, and then re-refined and smoothed to obtain a sheet with a thickness of 2 mm for later use.

8. The processing method according to claim 2, characterized in that: In the step 5, the surface roughness of the mold joint surface is not greater than 0.4, the mold is preheated to 151°C ± 2°C and maintained for at least 20 minutes, and then the valve body is installed and preheated for another 1 minute.

9. The processing method according to claim 2, characterized in that: In the step 6, vulcanization is performed using a vacuum vulcanizer; The vulcanization process parameters are as follows: vulcanization pressure 7MPa~10MPa, vulcanization temperature 151℃±2℃, vulcanization time 20min; After the mold cools down naturally, remove it from the mold.

10. The processing method according to claim 2, characterized in that: In the step seven, a scraper is used to manually remove excess rubber material around the rubber surface.

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