1 scope
This technology is applicable to ordinary
steel sheet, galvanized steel sheet, stainless steel and aluminum wind control.
2 construction preparation
Requirements 2.1 materials and equipment:
2.1.1 using sheet metal, steel primary
materials should have a factory certificate or qualification documents.
2.1.2 make duct and accessories plate
thickness should meet the requirements of table 4-1.
2.1.3 galvanized steel sheet surface must
not have cracks, scars and defects such as watermarks, zinc coating crystalline
patterns.
2.1.4 make stainless steel air duct and
accessories plate thickness should meet the requirements of table 4-2.
Table 4-2 of the wind pipe and fittings of
stainless steel plate thickness
Round duct diameter or rectangular duct
side
(Mm) stainless steel plate thickness
(mm)
100~500 0.5
560~1120 0.75
1250~2000 1.00
2500~4000 1.2
2.1.5 stainless steel plates with acid and
alkali corrosion resistance at high temperatures. Plate surface without
scratches, scratches, dust and Pocket and other defects.
2.1.6 production aluminum air ducts and
accessories plate thickness should meet the requirements of table 4-3.
Aluminum sheet wind tube and accessories
plate thickness gauge 4-3
Round duct diameter or rectangular duct
side
(Mm) aluminum thickness
(mm)
100~320 1.0
360~630 1.5
700~2000 2.0
2500~4000 2.5
2.1.7 aluminum sheet should have good
plastic, electrical conductivity, thermal conductivity and acid corrosion
properties and surface without scratches and wear.
2.1.8 gantry cut Board machine, and
electric rushed cut, and hand with electric cut pour angle machine, and bite
mouth machine, and pressure reinforced machine, and folding party machine, and
collection sewing machine, and vibration type curve cut Board machine, and
volume round machine, and round elbow bite door machine, and steel cutting
machine, and angle (flat) steel volume round machine, and hydraulic clamp nail
clamp, and electric pulled Liu gun, and bench drill, and hand drill, and rushed
machine, and cuttings method blue machine, and spiral volume tube machine, and
electric, and gas welding equipment, and air compressor paint gun, equipment
and the stainless steel board feet, and steel ruler, and square Protractor, and
designated rules, and designated needle, and ocean rushed, and hammer, and not
hammer, and Clappers and other small tools.
Exhaust system steel plate thickness may
refer to the high-pressure system.
2.2 operating conditions:
2.2.1 processing should be spacious,
bright, clean, flat on the ground, not the wet plant.
2.2.2 the scene dispersing process should
have rain, snow, high winds and a firm structure of features.
2.2.3 work sites to have a corresponding
processing technology of basic equipment, facilities and power and reliable
security reset, and is equipped with fire-fighting equipment.
2.2.4 wind pipe making due approval of the
drawings, by reviewing the detail maps, System maps, and construction of a
written disclosure of technical quality and safety.
3 operational processes
3.1 process:
Cutting → cutting bite duct
making →
→ → chamfer
break →
Blanking flange welding → → holes punched
Round flange bending leveling → → → dash punch drill
→ Rivet flange flange → test →
→ → finished
painting factory
Note: when there is no design requirements,
galvanized duct products are not painted.
3.2 line basic line: right angle line,
perpendicular bisector, Parallels, angle bisector, straight parts, parts, etc.
Parallel methods, radiation methods should be used and the triangle line. In
terms of figures and bulk air hose of different geometrical shapes and
specifications, dash, respectively.
3.3 sheet shear material under review must
be conducted, so as to avoid errors, line shapes with mechanical shears and
scissors to cut by hand.
3.4 when cut, hand into the machine plate
holes is strictly prohibited. Placement tool allowed on items such as tools,
when adjusting the sheets, on the foot cannot be placed on the pedals. Using
stationary vibration cutting his hands to steady plate, hands away from the
blade shall not be less than 5cm, evenly properly.
3.5 plate after cutting in and rolling
before the mouth, must be chamfered with chamfering machine, or a pair of
scissors. Chamfered shape as in Figure 4-1.
3.6 air duct made of metal sheets using
bite connecting rivet connections, welded in different ways. Different plate to
bite or welding lines as provided in table 4-4.
Scuffing or welding lines of the metal duct
table 4-4
Board thickness
(mm)
材
质
Steel plate
(Does not include galvanized steel),
stainless steel
Aluminum plate
δ≤1.0
Bite by bite
1.0<δ≤1.2
1.2< δ ≤ 1.5 welding welding
welding
Δ >1.5 (welding) (welding and welding) (for gas welding and argon
arc welding)
3.6.1 bite connection type in the form of
direct-use 4-2. Bite and variable set according to the thickness and the width
shall comply with the requirements in table 4-5.
3.6.2 welding can be used for gas welding,
electric welding, or contact welding, welds forms should be determined in
accordance with duct construction and welding methods, optional forms in Figure
4-3.
3.6.3 rivet connections, rivet center line
must be perpendicular to the plate surface, rivet head should be pressed
plates, seams close merge and rivet neatly and evenly.
Bite table width (mm) table 4-5
Plate thickness wide bite angle b width b
Below 0.7 6~8 6~7
0.7~0.82 8~10 7~8
0.9~1.2 10~12 9~10
Between the plates riveted, generally
without bedding, design requirements, according to design requirements.
3.7 seam connection choose bite according
to use. Scope can refer to table 4-6.
Bite and scope of table 4-6
Scope type name
A single bite
Used sheet metal stitching and circular
duct closure bites
Vertical bite
Pipe used to round pipe or directly bites
Joint angle
For rectangular duct, elbows, tees and tube
bites
Corner bite
This bite is now rectangular air ducts are
used, sometimes also bends, tees, or four-way pipe
3.8 when you bite your fingers from the
wheel guard is not less than 5cm, the handle must not be put on the bite
tracks, steady sheets.
3.9 after bite sheet drawing of the folding
lines on the folding machine, at the Centre of lower line. When operating the
machine blade centre line coincides with the center line of the lower die, fold
into the angle you need.
310 percent should cooperate with each
other and with the folding machine to keep at arm's length so as not to bruise
turning plates or counterweight.
3.11 when making circular duct will bite
both ends into arc-shaped in a round circle on circle, according to the wind
pipe diameter specification adjust up and down roller spacing, when hands may
not directly push plate.
312 percent or after a round plate with the
comfort of machine or hand-stitching. When made, evenly, not too heavy. Single
and dual port does bite, burst free and half-bite phenomenon.
3.13 flange processing:
3.13.1 rectangular wind pipe flange
processing:
3.13.1.1 flange formed by the four angle
steel welding, dash should be aware of the welded flange diameter must not be
smaller than the outer diameter of the duct, using steel cutters cut.
3.13.1.2 blanking press the straightening
after impact on fastener holes and bolt holes, hole distance should not be
greater than 150mm. 8501 flame retardant rubber seal when making bedding, bolt
hole spacing can be appropriately increased, but not more than 300mm.
3.13.1.3 after punching angle steel welded
platform for weld, welding mould clamping according to the specifications.
3.13.1.4 rectangular flange material
specification should meet the requirements of table 4-7.
Rectangle table 4-7 of the wind pipe flange
Rectangular duct side length (mm) flange
material specification (mm)
≤ 630
25x3
800~1250
30x4
1600~2500
40x4
3000~4000
50x5
Note: the flange of the four corners of the
rectangle should be set screw hole.
3.13.2 rounded flange processing:
3.13.2.1 the whole steel or flat steel in
cold simmer flange bending machines up to adjust on a required flange diameter
adjustable mechanical parts, roll into spiral shape down.
3.13.2.2 draw a line after the roll of
steel cut open, and placed one by one on the platform level.
3.13.2.3 adjustment of various flanges for
welding, punching.
3.13.2.4 round flange material
specification should meet the requirements of table 4-8.
Round table 4-8 of the wind pipe flange
Circular duct flange diameter materials
specifications
(Mm) flat steel (mm) angle (mm)
Less than 140-20x4
150~280
-25x4
300~500
25x3
530~1250
30x4
1320~2000 40x4
3.13.3 without flange processing:
Jointless pipe interface used in machinery
processing, size should be correct and shape rules, interfaces should be tight.
Without flange corners of the rectangular duct connector fixed measures.
Wind tube without flange connection can use
socket, cutting, sheet, flange spring clip in the form, as shown in table 4-9,
4-10, 4-11.
3.13.4 stainless steels, aluminum wind pipe
flange standards should meet the requirements of table 4-12 use of materials.
Flange material specifications (mm) table
4-12
Round, rectangular, stainless steel air
tubes
≤ 280
320~560
630~1000
1120~2000
-25x4
-30x4
-35x4
-40x4
Round, rectangular aluminum duct
≤ 280
320~560
630~1000
1120~2000
2000~ L30×4
L35×4
L40×4
-30x6
-35x8
-40x10
-40x12
In the wind tube rivet flange when the
waist band eyes, facial tubes fit on personnel to avoid punches.
3.14 rectangular duct side older than or
equal to 630mm and duct insulation grew up to 800 m or m, pipe length in 1200mm
shall take such measures. Length is less than or equal to the 800mm duct,
should be reinforced by cord reinforcement and line method.
, High pressure air pipe length is greater
than 1200mm, should take the form of reinforced box reinforcement.
High pressure single bite duct seam
strengthening measures.
Duct plate thickness greater than or equal
to 2mm, the strengthening measures may be appropriate to relax.
Wind pipe rehabilitation method as shown in
Figure 4-4, 4-5.
3.15 the wind pipe and flange forming, air
tube and flat steel flanges available flanged connections; and angle steel
flange connection, pipe wall thickness is less than or equal to 1.5mm can use
flanging Liu, rivet size, Liu Kong sizes see table 4-13 requirement.
Pipe wall thickness is greater than the
1.5mm flange welding along the duct around the nozzle and welding, resistance
spot welding flange and the outer surface of the pipe wall fitting; full
welding flange should be out of the duct pipe 4~5mm, to prevent deformation,
Figure 4-6 methods can be used.
Figure 4-5 rectangular duct reinforcement
forms
Circle, rectangle specifications and wind
pipe flange rivet rivet hole table 4-13
Type duct specification rivets rivet size
specification
120~630
800~2000 φ4.5
φ5.5 φ4×8
φ5×10
200~500
530~2000 φ4.5
φ5.5 φ4×8
φ5×10
Several welding sequence used in the
picture, indicating the general direction of welding, welding of small arrows
indicate some direction, sequence number indicates the welding. So can cause
welds to evenly heated and cooled, thereby reducing the deformation.
3.16 wind pipe and flange rivet quality
review before, after passing on the flange in the wind pipe, set aside 10MM
flange pipe end, tube on the side in line with flange plane to the vertical,
and then use the hydraulic riveting pliers or a manual clamp clamp rivets the
eye duct flanges are anchored, and at four weeks.
3.17 the flange should be formed, should
not cover screw holes, four corners should be bulldozed, there should not be
returned, so as to avoid air leakage.
3.18 wind tube and widgets (Zui Zi, short
tube) joint, three-way, four-way branch offices to close, cracks should be
sealed using solder or glue block so as to avoid air leakage. Play fluid are
not allowed when using Tin soldering, melting water, prevent splashes wounding
hydrochloride be properly kept.
3.19 duct spray preservative should be at
low temperature (below + 5 c) and humidity (relative humidity less than 80%)
environments, should remove surface dust, dirt and rust before painting and
keep dry. Painting, film should be uniformly, without accumulation, spill paint
defects such as, wrinkles, bubbles and color mixing.
Common plate must be pressed in with spray
paint, ensure that the bite sew difficult to rust.
3.20 thin steel anticorrosive paint design
is not required, may refer to the provisions of table 4-14.
Sheet steel paint sheet 4-14
Ordinal duct conveying the gas medium paint
paint category number
1 does not contain dust and the air
temperature does not exceed 70 ℃ coating rust-inhibiting primer
Surface-coating antirust primer
Outside surface finish (Matt) 2
1
2
2 does not contain dust and temperature not
exceeding 70 ℃, heat-resistant paint Interior and exterior air 2
3 chip air containing dust or powder coated
in anti-rust primer
Surface-coating antirust primer
External surface coated paint 1
1
2
4 contains corrosive acid on the air inside
and outside surface primer
Acid-resistant paint on inside and outside
surface ≥ 2
≥ 2
Note: the required duct not coated on the
outer surface of the insulation Binder should be coated paint two times.
3.21 wind tube product testing should be
main tubes, pipes wrote in the order system connecting numbers and engineering
Jane reasonably stacked neatly, waiting to transport the factory.
4 quality criteria
4.1 project:
4.1.1 specifications and dimensions must conform
to the design requirements of the duct.
Inspection method: standard and Visual
check.
4.1.2 wind tube bit slit width must close,
evenly, no defects such as holes half a bite and swelling. Straight pipe joints
should be staggered vertical bite.
Inspection method: Visual check.
4.1.3 wind pipe no burn, weld defects such
as cracks and leakage, longitudinal welds must be staggered.
Inspection method: Visual check.
4.2 Basic project:
4.2.1 appearance quality of duct should
reach angle, straight and circular uniform, parallel to both ends, no corners.
Bump on the surface is not more than 5mm; wind pipe and the flange firmly
attached, flange flat width of not more than 6mm, close to the flange.
Inspection method: cable, standard and
watch inspection.
4.2.2 wind pipe flange holes should meet
the requirements of specification for design and construction, welding should
be solid, weld does not set screw hole. Screw holes have interchangeability.
Inspection method: standard and Visual
check.
4.2.3 duct reinforcement should be solid
and reliable, in order, spacing, and symmetrical.
Inspection method: observation and hand
methods.
4.2.4 stainless steel plate, aluminum plate
duct surface should be no nicks, scratches, Pocket and other defects. Composite
plate duct surface without damage.
Inspection method: Visual check.
4.2.5 Tin cutting width of flange to be
consistent, once you insert both pipe ends should be solid and reliable.
Inspection method: Visual check.
4.3 allowable deviation
4.3.1 wind pipe and flange production size
tolerances and the test method should meet the requirements of table 4-15.
Wind pipe and flange production method for
the determination of tolerances and table 4-15
Project tolerance (mm) test method
1 round duct diameter
φ≤300mm 0
-1 with standard diameter of 90 degrees to
each other
φ>300mm 0
-2
2 large rectangular duct side ≤ 300mm 0
-1 foot check
>300mm 0
-2
3 circular flange diameter +2
0 with standard diameter of 90 degrees to
each other
4 rectangular flange side length +2
0 using standard four-sided
5 difference between rectangular flange two
diagonal 3 foot check
6 flange 2 flange flatness on the platform,
using feeler gauges to check
7 flange flatness of weld butt 1
5 finished product protection
5.1 to maintain galvanized steel smooth
surface clean and mat placed dry across the tide and spacious wood shelves,
stacked neatly.
5.2 stainless steel plate, aluminum plate
to stand on a wooden frame, do not overlap, so as not to scratch the surface as
you drag. Material should be made
Drawing tool with no scratches, operators
must use wooden hammer or rubber hammer, hammer shall be used so as not to drop
points to generate rust.
5.3 flange material classifications
streamline code, open place should take measures against rain, snow, reduce
rust.
5.4 air duct products should be placed on a
flat, water-free, spacious venue, not with other materials, equipment, such as
mixing together, and rain and snow prevention measures. Code number should be
based on system, orderly, reasonable, easy shipping.
5.5 air duct handling handling with care to
prevent damage to the finished product.
6 quality problems to be noticed
6.1 metal duct easily quality problems and
preventing measures refer to table 4-16.
Wind pipe making easy to produce quality
problems and preventing measures for table 4-16
Ordinals often quality control measures
1 rivet off enhanced responsibility, rivet
inspection
According to operate correctly
Longer rivets
2 wind pipe flange connection does not use
feet to look for are the flange perpendicular to the straight-sided tube sided
flange width
3 flange flange corner segment of air
leakage in front of chamfer
Bite when overlap flanging raze
The corners should not be returned
4 holes sealed with solder or glue pipe
connection holes appear blocked
5 wind pipe with varying degrees up and
down the side to sink, small side protrude on both sides, there were deformed
by use of the specification plate thickness, bite should be according to the
function in the form of strengthening the norms
Distortion 6 rectangular duct, tilt angle
correct cutting
Sheet reserve must be dimensionally correct
bite, ensure consistent bit width
Rectangular elbows, 7 round elbow accurate
right angle cutting
8 round duct misalignment
Round three-way angle not lax, occlusal
properly the next
7 quality records
7.1 inspection projects and inspection
record form.
7.2 metal duct fabrication section for
quality inspection and assessment form.
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