1. Function Introduction
Shot-blasting machine is one kind of shot-blasting equipment, which
is applied to clean the surface of steel structure welding
work-piece, H-style steel, plate and other profiles. It can clean
away rusty spot, rusty scale, welding slag on the work-piece
surface, as well as welding stress, in order to remove stress and
improve surface lacquer quality and rot proofness of steel
structure and steel.
2. Main Performance Features
Compared with other machines made in home factories, this machine
has some advantages as following:
The quantity of shot-blasting and arrangement mode both are
calculated by computer mass ejection simulation. The 8
shot-blasting are located at upper and lower, right side and left
side, ensuring that the bunch of projectiles ejected by
shot-blasting cover the most part of the steel surface, including
the end parts. It makes sure that the effect of shot-blasting is
overall and effective.
The system is a centrifugal peering shot-blasting, which is adopted
in advantages of massive shot-blasting and high ejection speed.
Both the quantity and the momentum of the projectiles ejected to
the work-piece surface are highly improved in unit time. So it can
shorten the shot-blasting time, and improves the efficiency, comes
to a pleasing cleaning quality.
Dedusting system adopts filtration type of back flushing. Dust
collector adopts folded dedust filter cylinder, and the dedusting
area has increased. The filter cylinder adopts nano-meter fiber
technology; dust collection efficiency is more than 99.99%,
especially for dust particles with a diameter of 0.5μm. After
efficient filtration, the air is clean and can be recycle used or
indoor emission. The pulse controller can adjust the frequency,
speed and intensity of ash removal, compared with domestic
traditional bag type single grade dedusting system, it has
advantages of high dedust efficiency, lower operation resistance,
small volume, light weight, easy replacement and so on. Emission
quantity meets the national emission standard.
Shot separation system adopts advanced full curtain type; it’s
invented by company after a long time research. It’s especially for
steel structure shot separation cleaning after blasting. The
performance indicies achieves home and abroad similar product
level. The separation combines both wind selection and screening
together, separates dust, metal oxide scale fragments, broken sand,
large particles from qualified projectile, and obtains clean steel
Spring steel plates and resistance rubber complex figure type
baffles are installed in the two ends of shot-blasting chamber, in
order to prevent projectiles splashing. At same time, it decreases
the area of chamber in and out ports, so enhances the effect of
Projectile clean-away device is installed in every out port of
chamber, it can blow away remained projectile on work-piece, reduce
the wastage of projectile, and lower the leakage of projectile. To
the complicated structure work-piece, operator can clean projectile
at output. Dust is absorbed by dudusting system. This system adopts
self-circulation type to clean the surface.
Adopting the international advanced technology projectile
controller. Not only can control projectile self-support. But also
can through the control valves’ work schedule regulate projectile’s
flow rate. So as to realize it supply controllable and adjustable.
It can guarantee no leakage projectile and jam phenomenon
.Diversion safe and reliable.
Aim at different specifications, shapes and complex degree of
steel. The roller running speed can use transducer to on-line
adjusting. Make different parts can get cleaning effect.
3. Technical data
|Width × height||≤1000×1800mm|
|Quality requirement||Sa2.5, Ra15-50|
|Impeller head (8)|
|Model of impeller head||Q034II|
|Quantity of shot-blasting||8×200kg/min|
|Shot blasting speed||65-70m/s|
|Power of shot-blasting machine||8×11KW|
|Work-piece conveying system|
|Length of input roller conveyer||15000mm|
|Length of output roller conveyer||15000mm|
|Load capacity of roller conveyer||1000kg/m|
|Shot conveying system|
|Capacity of shot conveying||120T/h|
|Longitudinal screw conveyor|
|Power of bucket hoister|
|Power of curtain separator|
|Width of curtain||2000mm|
|Steel shot diameter||ф1.2-ф1.8mm|
|Model of dusting system||LMF-I|
|Wind speed of the gate||＞5m/s|
|Handling volume of dusting system||18000m3/h|
|Quantity of filter core||18|
|Filtering area (18×20)||360㎡|
|Centrifugal ventilator Model||4-72-5A|
|Centrifugal ventilator air volume||18000m3/h|
|Centrifugal ventilator wind pressure||2022 Pa|
|Centrifugal ventilator power||15kw|
|Cleaning system ventilator power||15kw|
|Whole machine air volume||18000m3/h|
4. Equipment components and structure features
This series of shot blasting and cleaning machine mainly includes
shot blasting and cleaning cabinet, work-piece conveying system,
shot circle clean-up system, impeller head, dust removing system
and electrical control system.
Shot blasting and cleaning cabinet
Shot blasting and cleaning cabinet consists of main and assistant
cabinets. Main cabinet is welded by 12mm steel plate and profile
steel, with characteristic of high intensity, good rigidity and
little vibration. There is one wearing protective chromium plate in
the main cabinet inner wall, which is installed by bolts and
changed conveniently. Assistant cabinet is also welded by steel
plate and profile steel with good rigidity and intensity, and can
reduce noise effectively.
In order to prevent shot and dust overflowing, five flexible
baffles like finger is set at cabinet input and output end, which
is composed of 2mm, spring steel plate and 5mm double-layer wearing
rubber through coining. Finger-like baffles can prevent shot
spattering efficiently and have excellent performance-price ratio
and useful lifetime. Meanwhile, it will reduce opening size and gap
area at cabinet entrance and exit end so as to make wind speed of
dust removing system more than 5m/s to increase dust removal
effect, which is larger than dust overflowing speed.
Dust collection is mounted in top part and lower side of entrance
and exit terminal in shot blasting cabinet. Dust collection
connects with dust removing system and the cleaning cabinet is in
sub pressure state, which can assure no dust overflow.
Impeller head is mounted at the side of up and down, left and
right, whose position is designed by computer according to
processed components character to decide the best location. After
work-piece entering into cabinet, shot giving valve starts working
and impeller head begin to blast shot to work-piece at different
position, attachment and remained welding slag of work-piece
surface will be cleaned up rapidly.
Impeller head starts to work selectively on basis of work-piece
specification and shape. 8 impeller heads are able to work at the
same time when blast big and complicated work-piece; for small and
simple work-piece, you can select relative impeller heads to work.
Shot circle clean-up system
This system consists of longitudinal helix conveyer, bucket
elevator, separator, and storage box and impeller head. (Schematic
Clean cabinet – longitudinal helix – bucket elevator – traverse
helix – separator – storage box – shot giving valve—impeller head –
Helix conveying machine is set under clean cabinet, which is used
to convey shot to bucket elevator. And bucket elevator lift it to
convey helix on the top of separator, and then distribute shots
evenly. By air separation, dust, metal oxide skin fragment, broken
shots, big particle sundries and effective shots are separated.
Deduster collects dust, whirlwind deduster discharge broken shots,
screen mesh shake big sundries and effective shots are stored in
storage box for use. Through adjusting the size and position of
baffle commissure on top of separator can improve width and density
of shot layer. If regulate filter board coordinately, separating
effect will be excellent.
Shot giving valve is installed at the bottom of storage box,
controlled by pneumatic system; transmit shots from conveying
pipeline to impeller head.
The turning direction and attacking angle is calculated according
to sector angle, shoot angle, arrival angle, quantity, lay-out
method, blasting feature and work-piece shape and specification
through computer simulate blasting. Eight impeller heads are set at
eight different positions respectively in main cabinet, which can
assure shot stream with high surface covering ratio. It can cover
profile steel surface including rib plate, as a result, realizing
full, thorough and high efficient cleaning.
Shot blasting system adopts centrifugal direct correction impeller
head, with characters of big shot quantity and high blasting speed,
which is developed by our own company on basis of advanced
technology of Germany SCHLICK Company. Shot quantity and momentum
is improved remarkably in unit time, so shot blasting time is
reduced and the clean efficient is increased.
Impeller head is the key part of this machine, its working
principle is: impeller creates centrifugal force and wind force
during high speed rotating, preaccelerate the shots when it flow
into shot pipeline, under the action of centrifugal force, through
orientation window and along vane length direction, speed up and
blast at last. Formed shot sector stream attack work-piece surface.
The impeller head includes vane wheel, vane, shot dividing gear,
orientation jacket and motor. Vane wheel is double disk structure.
Vane adopts self position structure and is fastened in vane wheel
depend on centrifugal force with features of convenient disassemble
and stable and reliable.
Vane, shot separating gear and orientation jacket use high chromium
wearing alloy material, with characters of long lifetime. Vane can
make sure for 1500 useful hours and shot separating gear 2000 hours
and orientation jacket 2000 hours.
Turn orientation jacket can change shot blasting direction. And the
adjusting principle is shot stream can cover work-piece fully.
Shot cleaning system
High pressure fan is set on the top and sides of exit end in shot
blasting cabinet, which can blow and clean remained dirt on
work-piece surface and reduce loss and shot leaking ratio.
There are several nozzles in this system, the air blast also can
clean remained dust on work-piece surface so as to reach a clean
surface. Blowing dust is collected by dust removing system.
Wind force use self circle, high pressure fan sucks wind from shot
blasting cabinet to avoid air blasting infusing air pressure
balance and make sure sub pressure state in cabinet and enough dust
removing speed and prevent overflowing.
Dedusting system is made up of dust removal pipe, air valve
adjustment and filter cylinder dust removal. Dust removal pipe has
three air valves, one is used to adjust the separation speed, the
other two are used to adjust speed and air pressure of dust
collector, in order to control dedusting to meet the national
Filter cylinder dust removal is foldable cylinder sharp, external
diameter is 325mm, height of pipe is 660mm. The dust removal area
of filter cylinder is 20m2 and the bag type covers only 0.61 m2, so
filter cylinder is easily installed.
This equipment has following features:
Small volume, small occupation
High clean up efficiency, above 99% for submicron dust
Adopting new filter element as main part with long service lifetime
Reasonable structure, convenient maintenance, low cost
Energy saving, running resistance is 500-800PA; primary resistance
is under 200PA, max. Resistance is 1500PA (fixed by wind pressure)
Adopting digital pulse control, reverse blow
Put filter element vertically, single fixed, safe and convenient
Dust barrel, dust cart and helix discharge device are optional
5. Working Principle
The work-piece lies on the roller conveyer to set speed through the
shot-blasting chamber. Before the work-piece getting into the
shot-blasting area, start on the shot feeding device, at the same
time, the impeller heads begin running on load. After the strike of
high speed shot bundle, the scale, dirt and scaffold on the surface
of work-piece will be cleaned. The working is cycling and continued
until no work-piece get into, then close shot valve and the
impeller head stop working.
6. Goods supply range
- Cleaning room assembly: main cleaning room, sub-cleaning room,
rubber curtain, guard plate for shot-blasting room, impeller head;
- Roller converter: outdoor roller conveyer, indoor roller conveyer,
chain, chain wheel;
- Screw conveying system: longitudinal screw conveying system, feed
screw conveying system, hoister, and separator, shot supply valve;
- Dust palletizing system: dust pipe, duster, fan, wind pipe, chimney
and reverse blowing clean device;
- Electric controlling assembly: electric controlling box.
- Spare parts (vulnerable parts):
|Serial No.||Vulnerable parts||Material||Quantity||Service life|
|1||vane||high chrome steel||64 pieces||400hours|
|2||Shot separate wheel||high chrome steel||8pieces||800hours|
|3||Direction sleeve||high chrome steel||8pieces||800hours|
7. Parts prepared by user
a. Foundation (provide by supplier)
b. Foundation bolt or expansion bolt