Anhui Vocational and

Technical College of
Mining
Graduation Project (Thesis)
(20 th)
Title Eye Selection of belt conveyor design

Instructor Gu Faliang
Hospital Department Mechanical Engineering
Class Level Mine Electrical 092
School Number
Surname Name Ren Yang Yang
June 9, 2012

Meaning one, topics

The design that I have a deeper understanding of the mechanical aspects of the design
and CAD drawings. This hands-on, so I met a lot of incredibly issues in the design process,
which is due to previously learned theoretical knowledge can not be combined with a good
time, did not mastery, at design time can not come in handy , skilled application.

Second, the main problem the main content of the study, to be solved
(outlined the main points)

Conveyor belt machine computing capacity and maximum load, according to the election of
the tasks required of the motor and gear progression model

Third, the study (work) steps, methods and measures (ideas)

According to first calculate the resistance of the subject needs of each segment to
determine the traction belt needs to choose the necessary motor, the motor in checking
whether the actual carrying capacity

Fourth, the thesis (design) outline

First introduced consisting belt conveyor

Carrier in the form of a belt drive
Advantages Disadvantages belt machine, the joint
Calculate the required traction belt hanging motor according to the task to Pick
In step hung reducer series and selected based on the ability of the fluid coupling fluid
coupling is reproduced
Fifth, the main references
1. Mechanical Design Handbook (Chemical Industry Press)
2. Crane Design Manual
3. Belt conveyor design manual
4. Not limited Introduction (People's Education Press)
5. JSOSO49 / 1
6. Design of steel structures TJ17-749 trial)
Instructor comments:

Signature:
In Month Day

Graduate design (thesis) work of the Steering Group comments:

Signature:
In Month Day

Graduate design (thesis) Leading Group comments:

Signature:
In Month Day

Eye Record
A: belt Brief
1, the composition of the belt conveyor
................................................... 2
2, in the form of a belt conveyor
......................................................... 3
3, belt conveyor advantages and disadvantages
...................................................... 4
4, belt conveyor Notes ...................................................... 4
5 belt conveyor protection
......................................................... 5
6, In the form of belt ...................................................... 6
7, the joint belt 7 ................................................
8 belt tensioner ............................................. 8
II: design task
..................................................................... 14
Three: design calculations
1. Drive unit calculation principles
............................................................ 12
2 raw data and working conditions
............................................................ 15
3 tensioning device computing
.................................................................. 21
4 reducer selection
..................................................................... 22
5 hydraulic coupling effect
............................................................... 24
Four: Reference Design Experience .................................
............ 26
A: belt Brief
1 belt conveyor composed of
⑴ conveyor
Conveyor belt conveyor, both bearing member is the lead member, it must not only
have the carrying capacity, but also have sufficient strength. Conveyor constituted by the
core and the cover layer, the core under tension, the coating layer protecting the core
from damage and corrosion. The fabric material and the core are two types of wire rope.
There are two multi-core fabric adhesive and overall canvas weave. Fabric core
materials are cotton, nylon and polyvinyl alcohol.
⑵ roller and bracket
Role roller and bracket support tape and the tape is hosted material, so that the tape
to keep running smoothly under certain sag. Roller conveyor along the full length
distribution, high number, it directly affects the work of the conveyor is running.
Manufacturing quality idlers mainly for rotation resistance and service life. From the
central axis of the roller bearing and the sleeve of three parts. Overloaded side tape
runs on three roller trough idlers. Two outer rollers disposed 20 °, 35 °, 45 ° groove
angle different.
Groove angle can make a reasonable choice of materials increased cross-sectional
area on the tape. Traffic increases. Idler spacing, should ensure that tape sag between
rollers as small as possible. Tape sag between rollers, usually less than 1% of the idler
spacing. Under idler spacing desirable 2.5 ~ 3m or take on a standard roller spacing of 2
times. Bracket available steel stamping, made ​ heavy use channel, both sides have
enough leg stiffness.
⑶ gear
The drive torque of the motor means is transmitted to the tape, so that continuous
movement of the tape device. It consists of motor, drive pulley, coupling, reducer and
other components. With the improvement of conveyor transport capacity, longer, motor
power transportation distance is increasing, multi-motor drive is also gradually
increasing. Multi-motor drive, can reduce the height and width of the transmission.
Drive pulley is the main power transmission components, it has single and double
drum rollers points. Single drum drive with drive system is simple, less parts
advantages. But in the mine, in order to compact structure, increasing the corners, in
order to adapt to the adverse conditions underground. Often using double drum drive.
Driving drum with steel plates welded or cast. There are three glossy surface, including
plastic and cast plastic. Power is not, under the influence of ambient temperature, using
smooth drum; in power, environmental humid case, the plastic surface of the drum to
prevent the belt slipping on the drum.
⑷ tensioning device
The role of tensioning means: to ensure a sufficient tension of the tape, the tape and
the drum to generate a frictional force necessary to restrict the sag in the tape between
the brackets so that the work conveyor. Tensioning device commonly used mechanical
tension, screw tension and tension-type hammer.
⑸ cleaning device
When conveyor operation, cleaning tape, dirt on the rollers and idlers are very
important because dirt can cause serious belt run and moving parts to wear. Unloading
the drum back often provided dirt scraper cleaning tape surface, and the other is
unloaded at the bottom of the rotary brush roller for cleaning the installation.
2. In the form of a belt conveyor
 Belt conveyor structure forms, there Groove belt conveyor, flat belt conveyor,
climbing belt, roll belt conveyor, belt curves and other forms.
Common belt conveyor can be divided into: ordinary canvas core conveyor belt,
high-strength steel cord belt transmission machine, all under the transport belt conveyor
proof, flame-type belt conveyor, two-speed dual op belt conveyor, reversible mobile belt
conveyor, belt conveyor and so cold.
Conveyor belt mainly consists of frame, conveyor belt, belt roller, tensioning
devices, drives and other components.
3 belt conveyor advantages and disadvantages
Compared with other conveyor, belt conveyor machine has the following
advantages:
① reliable operation, belt conveyor can take a class to a group of continuous
operation;
② conveyor low power consumption, help reduce production costs;
③ conveyor belt conveyor line adaptable and flexible, can be installed in a small
tunnel, you can also set up over ground traffic chaos and danger areas;
④ in environmental protection when working conveyor noise, if necessary, belt
conveyor can be enclosed in a hood where warrant drifting dust polluted air.

Disadvantages leather belt conveyor: Compared with other transportation

equipment, Belt Conveyor complex structure, the disadvantage of restricted angle,
height is relatively high during transportation, belt conveyors are required to plant a
larger area and length.
4. Operation Belt Conveyor Considerations

Before the conveyor belt is running, first make sure the belt conveyor equipment,
personnel, were transported goods are in safe state intact; Second, check all moving
parts normally no foreign body, check all electrical wiring is normal, the normal time to
put the belt conveyor operation. Finally, to check the difference between the supply

voltage and the rated voltage does not exceed ± 5%.

In the conveyor belt run into, you must do the following:
⑴ Close the main power switch and check whether the normal power supply into
the device and the power indicator light. The next step to normal.
　 ⑵ Closing the power switch of the circuit, to check whether it is normal. Under
normal conditions are: the power light does not operate equipment, belt conveyors
running light is not on, inverter and other equipment on, the inverter display panel shows
the normal (no fault code display).
　 ⑶ Accordance with the process in order to start all electrical equipment, electrical
equipment on after a normal start (motor or other device has reached the normal speed,
normal state) then the next start of electrical equipment.
⑷ the conveyor belt is running, you must comply with the provisions of articles designed
to be transported in goods, comply with design capacity belt conveyor. Secondly, we
must pay attention to all categories of personnel not touch moving parts of the conveyor
belt, non-professionals are not free to contact with electrical components, control
buttons, etc.. Finally, the conveyor belt can not run the inverter stage circuit, such as the
identification of maintenance needs, it must be carried out in order to stop the inverter is
running, otherwise the inverter may be damaged.
　　 ⑸ conveyor belt running stop Press the stop button when the system can only cut
off the power supply after all the stops.
5 mine belt conveyor protection
⑴ mine belt conveyor speed protection
If the conveyor malfunction, such as motor burned, damaged mechanical transmission
parts, belt or chain pull off, belt slippage, etc., mounted on a passive mechanical
conveyor accident in the magnetic switch sensor SG can not be closed or not closed at
normal speed After this time the control system will be inverse time characteristics after
a certain delay, speed protection circuit works, so the operative part of the action, cutting
off the motor power supply in order to avoid accidents to expand
⑵ mine conveyor belt temperature protection
　　 Conveyor belt friction roller and its temperature gauge, the detection device
(transmitter) mounted close to the drum over-temperature signal is issued after the
receiver receives the signal, after 3s delay, so that the operative part of the action,
cutting off the motor power supply , conveyor automatically stops and temperature play
a protective role.
⑶ mine coal under the conveyor belt head-bit protected
If a conveyor or an accident can not operate due to obstruction or gangue and coal
bunker full parking and other reasons so that the next head of the heap of coal, coal-bit
position corresponding sensor DL contact with coal, coal-bit immediate action to protect
the circuit, so that After a conveyor stop immediately. Then continue to the coal face,
behind the conveyor tail will occur followed by Taiwan pile of coal, and make appropriate
after a stop until it automatically makes loader stopped running.
⑷ mine belt conveyor coal bunker coal-bit protected
Let bunker in two coal-digit level electrodes, due to no empty bunker is not time to
put coal, coal will gradually be increased, when coal rose to a high position electrode,
coal-bit protected action,'s first belt conveyor from the start Each conveyor tail pile of
coal followed by parking
⑸ mine belt conveyor emergency stop lockout
In the lower right corner of the front of the control box with emergency stop latching
switch, use the left and right of the rotary switch, latching emergency stop can be
implemented on this station or reception conveyor
⑹ mine belt conveyor deviation protection
If the deviation phenomenon conveyor happened during the operation, the deviation
from the normal operation of the belt edge of the track deviation sensor mounted on the
side of the conveyor lever to pour and an alarm signal immediately. Alarm signal to
maintain the length of time may need to pre-set at the 3-30s range. During the alarm if
they can take timely measures to lift the deviation, the conveyor can continue normal
operation.
⑺ mine belt conveyor at any point midway stop protection
If at any point along the conveyor need to stop, they have to switch to the corresponding
position in the stop position, the belt conveyor will stop immediately. Need to re-open,
the first switch is reset, and then press the switch signal to the signal.
⑻ mine belt conveyor smoke protection
When the roadway due to other causes smog belt friction occurs, smoke hanging in the
roadway sensors play an alarm sound, and after 3s delay protection circuit effect, cut off
the motor power play smoke protection.
Form 6 of the belt
Industrial belt industrial belts, automotive belts and conveyor three categories. The
first two are part of the belt. Tape drive belt for transmitting mechanical power, including
flat type transmission tape and triangle transmission tape (V type tape). Composed of
a rubber and a reinforcing material (such as cotton canvas, rayon, synthetic fibers or
wires, etc.). Multilayer hang glue canvas, synthetic fabrics, cords and wires, etc. for
tensile layer, the laminated rubber by molding, curing and made. Compared with the
gear drive, chain drive, tape drive has a simple mechanism, low noise, and low cost
devices are widely used in a variety of power transmission. An endless belt drive on the
machine, set on two pulleys, multi-core cable with a leather or rubber, known as a belt.
Power transmission belt is the prime mover of the motor or engine rotation
generated by conduction from the tape onto the pulley machinery and equipment, it is
also called dynamic belt. It is the core mechanical and electrical equipment coupling
components, types abnormal range extremely versatile. From big to thousands of
kilowatts of giant motors, small to less than one kilowatt micro-motors, and even home
appliances, computers, robotics, precision machinery, including belts are inseparable.
Its biggest feature is the freedom to speed, distance transmission, simple structure,
easy to replace. So, from the original mechanical to modern automatic equipment has
the figure of the belt, the product after several evolving technology matured.
The belt can be divided into belt, timing belt (toothed belt, when the band), flat
belt (based band, dragon belt), agricultural machine belt, high-speed anti-oil belt, round
belt (round belt), flat belt, water tower with (wide band), with speed, motorcycle
transmission belt, V-belt (V belt), in parallel belts, multi-groove belt, hexagonal belts,
active belt, traction belt, automotive belt
7 belt connector
All must be connected to the annular conveyor to practical use, so the belt joint is
critical. A direct impact on the quality of the joint life of the belt conveyor line and can
smooth running smoothly. Here are several ways conveyor belt joints:
⑴ conveyor mechanical joint law: generally refers to the use of a belt buckle
connectors, easy and convenient method of this connector is also more economical, but
inefficient joints, easily damaged, have an impact on the service life of the conveyor belt
products. Whole flame retardant PVC and PVG conveyor belt joint anti-static, generally 8
with the following products have adopted this joint approach.
⑵ conveyor head cold bonding method: the use of cold bonding adhesive to the
joint. This mechanical splice joint approach than high efficiency, but also more
economical, the joint should be able to have good results, but from a practical point of
view, the process conditions are difficult to grasp, in addition to affecting the quality of
the adhesive joint is very large, so it is not very stable.
⑶ conveyor heat curing joint law: proven to be the best kind of joint approach to
ensure a high joint efficiency, but also very stable, the joint life expectancy is long, easy
to grasp. But the existence of the process cumbersome, expensive, long time joints and
other shortcomings.
8 of the belt tensioner
The role is to ensure the tensioning device has enough tape tension and tape drum
to generate the necessary friction between the sag limit the tape holder, so that the
conveyor to work. Tensioning device commonly used mechanical tension, screw tension
and tension-type hammer.
Hammer tensioning belt conveyor belt slippage: use hammer belt conveyor
tensioning device can be added when the belt slipping counterweight to solve, adding to
the belt does not slip up. But should not be added too much, so that the belt tension is
exposed to unnecessarily large decrease belt life.
Tensioning screw or hydraulic tensioning belt slippage: Use screw or hydraulic
tensioning conveyor belt tensioning adjustable tensioning stroke occurs when slipping to
increase tension. Sometimes, however, has enough tension stroke, permanent
deformation of the belt occurs, this time period may be re-vulcanized belt truncated.
Belt conveyor belt deviation is the most common runtime failures. To address such
failures is important to note the dimensional accuracy of the installation and daily
maintenance. There are many reasons for deviation, to be handled differently depending
on the cause.
⑴ adjust the carrying idlers Belt conveyor belt at the time of the entire central
deviation position adjustable belt conveyor idlers to adjust deviation; idlers in the
manufacture of both sides of the mounting holes are worked into the hole to be
adjusted. Specific adjustment method is biased belt which side, which side of the belt
idlers toward the forward direction forward, or move the other side. Belt deviation is
shown in the upward direction at the lower rolls care should move to the left, the upper
roller set right.
⑵ installation aligning roller group Spherical roller group has many types, such
as the middle of the shaft, four-link type, vertical roll, etc. The principle is to use block or
roller in the horizontal plane Rotate the block or transverse thrust to the heart of the belt
is automatically adjusted to achieve the purpose of belt deviation. Usually in the total
length of the shorter belt conveyor or belt conveyor using two-way operation of this
method is reasonable, because of the short belt conveyor easier deviation and not easy
to adjust. The long belt conveyor is best not to use this method, because the use of self-
aligning roller belt life groups will have some impact.
⑶ Adjust the position of the drive roller and the idler pulley Drive rollers and idler
pulley adjustment is an important part of the belt deviation adjustment. Because there is
at least one conveyor belt rollers 2-5, all of the rollers must be installed perpendicular to
the center line position of the belt conveyor in the longitudinal direction, if the deviation is
too large skew inevitable. The adjustment method is similar to the adjustment of idlers.
As for the head drum of the belt deviation to the right cylinder, the right side of the
bearing seat to be moved forward, the roller belt deviation to the left, the left side of the
bearing seat to be moved forward, and the corresponding may also be The shift on the
left side or the right side of the bearing housings shift. Rear roller adjustment method
and the head drum opposite. Adjustment method. After repeated adjustments until the
belt tuned ideal position. Before adjusting the drive or idler pulley is best to install its
exact location.
⑷ tension adjustment at Adjust the belt tension of the belt conveyor is deviation
adjustment is a very important part. Hammer at the two upper tension bend pulley in
addition to the direction perpendicular to the outside of the belt should be perpendicular
to the length of the vertical gravity, which is to ensure its axis horizontal centerline. When
using the tensioning screw or hydraulic tensioning cylinder, two tensioning roller bearing
shall simultaneously pan, to ensure that the cylinder axis and perpendicular to the
longitudinal direction of the belt. Specific adjustment method is similar to the adjustment
of the belt deviation at the drum.
⑸ reproduced affect the position of the point of blanking the belt deviation
Location reprinted point blanking material has a very big impact on the belt deviation,
especially in the two belt a greater impact in the horizontal plane perpendicular to the
projection. Generally should consider the relative height reprinted point down two belt
machine. The lower the relative height, the greater the horizontal velocity component
materials, the impact of the lower belt greater lateral, but the material is difficult
centered. So that the material on the belt cross section deflection, resulting belt
deviation. If the material is biased to the right, then the belt deviation to the left, and vice
versa. In the design process should increase the relative height of the two belt as much
as possible. In the mobile space constraints of bulk material handling machinery down
funnel chute and other parts of the form and size should be seriously considered.
General chute width should be about two-thirds the width of the belt is more appropriate.
In order to reduce or avoid the belt deviation increase the blocking plate blocking
material, changing the direction and position of the whereabouts of the material.
⑹ bi-run conveyor belt adjustment deviation Two-way operation of belt
conveyor belt deviation adjustment is relatively more difficult than the one-way conveyor
belt deviation many adjustments, specific adjustments should be adjusted in one
direction, and then adjust the other direction. To carefully observe the relationship
between the direction of belt movement and deviation trend adjustment, individually
adjusted. Emphasis should be placed on the drive rollers and redirecting roller
adjustment, followed by adjustment of the roller adjustment and the material blanking
points. Also note that the belt vulcanized joint force when the belt section in the
longitudinal direction is uniform in the use of the force of traction on both sides of the
chain as much as possible the same.

Second, the design task

1, the raw data and working conditions:
1.1 delivery of materials: Anthracite
1.2 Rated capacity:
Rated transport capacity: Q = 1500t / h;
1.3 Conveyor main parameters:
Bandwidth: B = 1400mm; belt speed: V = 2.5m / s; levels captain: L = 92m;
chute length: L = 10m
Lifting height: H = 22.155m; inclination: δ = 13.6 °;
Bulk density: ρ = 0.985t/m3
1.4 Working environment:
Interior decoration, the number of starts per hour less than 5 times.
Three. Design calculations
1. Drive unit calculation principles
1.1 overall maximum drive power

(Kw)
Where: N - Motor Power (Kw)
S max - the maximum with strong tape (N)
μ - coefficient of friction between the drive pulley and belt
α - driving drum circumference corners
V - belt speed (M / s)
η total - the total efficiency of the drive unit η = 0.9

1. Select the type of each parameter

1. Tapes maximum tension

For weaving the strip: S max = ST.BZ / n (N)

For the steel cord belt: S max = ST.B / n (N)
Where:. ST - conveyor belt breaking strength N / mm layer
B - transport Bandwidth (mm)
n - the conveyor belt joint safety factor

a. Tensile strength of the belt, the conveyor belt width and the number of layers of the
core layer
 Tape tensile The
Core strength thickness For Applicable
Tape Model
material N / mm · of each Bandwidth layers
Layer layer
mm
Cotton
CC-56 56 1.5 500 ~ 1400 3-6
canvas
NN-150 150 1.1 650 ~ 1600 3-6
Neeb NN-200 200 1.2 650 ~ 1800 3-6
NN-250 250 1.3 650 ~ 2200 3-6
Neeb NN-300 300 1.4 650 ~ 2200 3-6
Polyester EP-200 200 1.3 650 ~ 2200 3-6

b. Tape allowable bandwidth matching layers

500 650 800 1000 1200 1400

CC-56 3-4 4-5 4-6 5-8 5-8 6-8

NN-150 3-4 3-5 4-6 5-6 5-6
NN-200 3-4 3-5 3-6 4-6 4-6
EP-200
3 3-4 3-6 4-6 4-6
NN-250
EP-300
3 3-4 3-6 4-6 4-6
NN-300

c. Matching steel cord conveyor belt of bandwidth and strong

630 800 1000 1250 1600 2000 2500 3150

 800 √ √ √ √ √ √ √ √
1000 √ √ √ √ √ √ √ √
1200 √ √ √ √ √ √ √ √
1400 √ √ √ √ √ √ √ √

d. Belt safety factor

Cotton canvas with: n = 8 ~ 9

Nigeria Dragon With: n = 10 ~ 12
Steel cord belt: n = 7 ~ 9
5, matching belt speed and bandwidth

0.8 1.0 1.25 1.6 2.0 2.5 3.15 4 5 6.5

500 √ √ √ √ √ √
650 √ √ √ √ √ √
800 √ √ √ √ √ √ √
1000 √ √ √ √ √ √ √ √
1200 √ √ √ √ √ √ √ √
1400 √ √ √ √ √ √ √ √

(2)the raw data and working conditions:

1.1 delivery of materials: Anthracite
1.2 Rated capacity:
Rated transport capacity: Q = 1500t / h;
1.3 Conveyor main parameters:
Bandwidth: B = 1400mm; belt speed: V = 2.5m / s; levels captain: L = 92m; chute length: L = 10m
Lifting height: H = 22.155m; inclination: δ = 13.6 °;
Bulk density: ρ = 0.985t/m3
1.4 Working environment:
Interior decoration, the number of starts per hour less than 5 times.
2, circumferential force and run power calculation
2.1 determine various parameters:
2.1.1 taken by the GB/T17119-97 coefficient C = 1.836
2.1.2 Analog friction coefficient f = 0.025
2.1.3 Each branch mitoxantrone roller bearing rotating part of the quality q RO
Bearing rollers rotating part of the quality q 'R0 = 8.21kg bearing branches idler spacing
a 0 = 1.2m
Roller bearing roller diameter is φ 133, bearings 4G305
2.1.4 Each branch mitoxantrone return rollers rotating part of the quality q RU
Return rollers rotating part of the quality q 'RU = 21.83kg q' RU = 11.64kg
Return branch idler spacing a U = 3.0m return roller shaft diameter φ 133, bearings 4G305
2.1.5 The quality of delivery of materials per meter q G
2.1.6 Quality q B per meter conveyor belt
Select conveyor EP200, glue 4.5mm, under plastic 1.5mm, 5 layer q B = 18.76kg / m
2.2 calculate the various resistance
2.2.1 The main specialty resistance F S1
a) roller bearing branch forward resistance: F ε 1 = C r μ O L e1 (q B + q G) gCos δ Sin ε
= 0.45 × 0.4 × 92 × (18.76 +166.667) × 9.81 × Sin2 °
= 1052N
Where: C r = 0.45 μ O = 0.4 L e1 = 92m ε = 2 °
b) return idlers forward segment of the branch resistance: F ε 2 = μ O L e2 q B gCos λ Cos
δ Sin ε
= 0.4 × 30.7 × 18.76 × 9.81 × Cos10 ° × Sin2 ° = 78N
Where: λ = 10 ° L e2 = = 30.7m
F ε = carry forward resistance + branch idler roller forward backhaul segment branch
resistance = 1052 +78 = 1130N
c) friction F gl transportation of materials between the baffle and the guide feed
F gl =
Obtained from the previous: F S1 = F ε + F gl = 1130 +3387.5 = 4517.5N
2.2.2 Additional special resistance: F S2
a) conveyor belt cleaner frictional resistance F r (calculated according to a single
sweeper)
Alloy blade cleaner resistance:
F r co = A ρμ 3 = 0.014 × 7 × 104 × 0.6 = 588N
Where: A = 1.4 × 0.01 = 0.014m2 ρ = 7 × 104N/m2 μ 3 = 0.6
b) air cleaner section of friction F r empty (calculated according to a single sweeper)
F r blank = mg μ 3 = 30.9 × 9.81 × 0.6 = 182N
Where: m = 30.9kg (single empty segment sweeper weight)
The unit is a combination of two golden sweepers, two groups empty segment sweeper, so:
Have: F S2 = 2F r co +2 F r empty = 2 × 588 +2 × 182 = 1540N (two alloy cleaner and two empty segment
sweeper)
2.3 circumferential force F U
F U = CfLg [q R0 + q RU + (2q B + q G)] + q G Hg + F S1 + F S2
= 1.836 × 0.025 × 92 × 9.81 × [20.525 +7.2156 +
(2 × 18.76 +166.667)] +166.667 × 22.155 × 9.81 +4517.5 +1540
= 51889N
Where: H = 22.155m
2.4 the power required to run the conveyor
2.4.1 operating power transmission roller: P A
By the GB/T17119-97 get:
P A = F U V = 51889 × 2.5 = 129.7kw
2.4.2 required drive motor power: P M
By the GB/T17119-97 get:
Take motor power P = 220kw, voltage 6000v, Model Y355-37-4
3, the conveyor belt tension
Tension-by-point calculation method
3.1-by-point tension according to law, to establish tension relationship as follows: (after
calculation diagram attached)
S 3 = S 2 +2 F r co + F L1 S 4 = S 3 + F H3-4 + F r empty S 5 = S 4 + F L2
S 6 = S 5 + F L3 S 7 = S 6 + F L4 S 8 = S 7 + F H7-8 + F r empty
S 9 = S 8 + F L5 S 10 = S 9 + F L6 S 1 = S 10 + F bA + F f + F gl + F C + F ε 1
Calculate the resistance of each section 3.2
3.2.1 bypass conveyor rollers each additional resistance
 a. Bypass conveyor drum winding resistance F L

Where: F - trends point on the roller conveyor tension

d - tape thickness d = 12.5mm = 0.0125m
D - drum diameter B = 1.4m
(By calculating the value of each drum list)
Drum diameter D Resistance of the belt wound around the
Drum Number (mm) drum bypass F L (N) Remark
B2 φ 500 44.1 +0.00225 S 2 F L1
B3 φ 500 44.1 +0.002256 S 4 F L2
B4 φ 800 27.56 +0.00140625 S 5 F L3
B5 φ 500 44.1 +0.002256 S 6 F L4
B6 φ 500 44.1 +0.002256 S 8 F L5
B7 φ 800 27.56 +0.00140625 S 9 F L6

b. Roller Bearing resistance:

3.2.2 Materials acceleration section resistance F bA

F bA = I V ρ (VV 0) = 416.667 × (2.5-0) = 1042N
Where: V 0 = 0m / s V = 2.5m / s
Friction F f 3.2.3 accelerating section with a conducting material between the tailgate
Ff=
Where: l b = 0m / s V = 2.5m / s
Friction F gl 3.2.4 transportation of materials between the baffle and the guide feed
F gl =
3.2.5 carrying branches running resistance F C
Cheng F C = Lfg (q RO + q G + q B) ± (q B + q G) Hg
= 92 × 0.025 × 9.81 × (20.525 +166.667 +18.76) + (18.76 +166.667) × 22.155 × 9.81 = 44948N
3.2.6 return branch running resistance F K
F H3-4 = Lfg (q B + q RU) ± q B Hg
 = 48.95 × 0.025 × 9.81 × (18.76 +7.2156) - 18.76 × 11.8 × 9.81
=-1860N
F H7-8 = Lfg (q B + q RU) ± q B Hg2
= 43.05 × 0.025 × 9.81 × (18.76 +7.2156) -18.76 × 10.355 × 9.81
=-1631N
3.2.7 tension value (calculated by the relationship between the tension derived)
From 3.1 calculated tension relationship:
S 3 = 1.00225S 2 +1224 S 4 = 1.00225S 2 -455 S 5 = 1.004505S 2 -412 S 6 = 1.0059176S 2 -385 S 7 = 1.008181S 2
-342 S 8 = 1.008181S 2 -1792
S 9 = 1.0104493S 2 -1752 S 10 = 1.01187S 2 -1727 S 1 = 1.01187S 2 +49241
When you start with the drive roller conveyor between the non-skid, must be met:

Where: F Umax = F U K A = 51889 × 1.5 = 77833.5N

Start coefficient K A = 1.5 μ = 0.35 α = 200 ° e μα = 3.4
Provisional Acceptance S 2 = 32431N, substituting the relationship we have:
S 3 = 33728N S 4 = 32049N S 5 = 32165N
S 6 = 32238N S 7 = 32354N S 8 = 30904N
S 9 = 31018N S 10 = 31089N S 1 = 82057N
4, the conveyor belt tension check
Conveyor belt sag limit of 4.1
4.1.1 For the branch (bearing branches)
Wherein: (h / a) max = 0.01 a 0 = 1.2m
F min = 24254N <S 9 = 31018N meet the requirements
4.1.2 For branch (return branch)
F min = 6901N <S 8 = 30904N meet the requirements.
Hence, too: S 2 = 32431 S 3 = 33728N S 4 = 32049N S 5 = 32165N S 6 = 32238N S 7 = 32354N S 8 = 30904N S 9 =
31018N S 10 = 31089N S 1 = 82057N
4.2 Checking belt tension
Optional polyester tape EP200 B = 1400mm conveyor running at maximum tension S 1 = 48836N
N ≥ 10 to meet the requirements of 12 ~
7, tension hanging heavy computing device quality
Vertical tensioning device located at a distance of approximately 6.7m high at ground level,
then tighten the tension roller co F H
F H = S 5, + S 6, = 32165 +32238 = 64403N
Hammer Quality: G = -G 1-G 2 = -1350-777 = 4438Kg
Take the weight block (Figure No. DT Ⅱ D-1) in an amount of 310, about 4.65t
Where: G1 ----------- vertical pull rollers DT Ⅱ 06B6142 quality, Kg
G2 ----------- vertical tensioning device DT Ⅱ 06D2146 quality, Kg
8, the tension diagram
3 tensioning computing device

1. Type tensioning device

The series consists of four kinds of tensioning device: screw tensioning device, vertical
hammer tensioning device, vehicle type tensioning device, tensioning device fixed winch

2. Determine the tension F

Press does not slip condition

Press meet sag conditions:
Among the larger as the tension force F
Where: F 1 - Tape largest allowable tension (kN)
a 0 - idler spacing (m) on
q B - material weight per meter, (kg / m)
q G - weight per meter tape, (kg / m)
The results:
Screw tensioning device:

Tensioning force Tensioning force

Bandwidth (mm) Bandwidth (mm)
(kN) (kN)
50 9 1000 38
650 16 1200 38
800 24 1400 38

Vertical Hammer tension force: 63; 50; 40; 25; 20; 16; 8kN
Hammer Car-tensioning force: 63; 40; 25kN
Fixed winch tension force: 150; 90; 50; 30kN

. Reducer Selection 4
Reducer is independent of closed transmission between the prime mover and the working
machine, used to reduce speed and increase torque to satisfy the work requirements, the growth
rate is also used in some cases, called accelerator.
Reducer should be chosen according to the conditions of the working machine selection,
technical parameters, power machine performance, economy and other factors, comparison of
different types, varieties outside dimensions reducer, transmission efficiency , carrying
capacity, quality, price, etc., to choose the most suitable reducer.

Gear is a relatively sophisticated machinery, its purpose is to reduce the use of speed,
torque increase
There are generally reducer helical gear reducer (including parallel shaft helical gear
reducer, worm gear reducer, bevel gear reducer, etc.), planetary gear reducer, cycloid reducer,
worm reducer, planetary friction mechanical stepless so.
　　 1) cylindrical gear reducer
Single-stage, two, two more than two. Arrangement of forms: expansion, Split, coaxial.
　　 2) bevel gear reducer
For the input shaft and the output shaft position to intersect the occasion.
　　 3) worm reducer
Mainly for the transmission ratio i> 10 of the case, the relatively large transmission
compact. The disadvantage is the low efficiency. Now widely used Archimedes worm reducer.
　　 4) gear - worm gear
If the gear at high level, the compact;
If the worm drive at high level, the higher the efficiency.
　　 5) planetary gear reducer
High transmission efficiency, wide ratio transmission range, transmission power 12W ~
50000KW, small size and weight.
　　 3, Common types of reducer
　　 1) The main features of worm reducer is a reverse self-locking feature, you can have a
larger reduction ratio, the input and output shafts are not the same axis on, nor in the same
plane. However, generally larger, high transmission efficiency, high precision.
　　 2) Harmonic reducer Harmonic Drive is the use of controlled elastic deformation of the
flexible element to transmit motion and power , and small size, high accuracy, but the
drawback is the limited flexible wheel life, the impact of intolerance, rigidity compared with
metal parts poor. Input speed is not too high.

　　 3) Planetary gear advantage is relatively compact structure, small backlash, high

accuracy, long life, rated output torque can do a lot. But the price is a little expensive.
Gear: in short, the general machine design and manufacture of the power out, the rated power
does not change, then, the greater the speed, the torque (or torque) is smaller; smaller
velocity, the greater the torque

Inspection, maintenance
Intermixing of different lubricants is prohibited to use. The oil level plug, oil drain plug
and the breather is determined by the location of the installation location. Their position
can be related to the installation location map reference deceleration machine to determine.
First, check the oil level
Cut off power to prevent electric shock! Wait cool gear!
Check the oil drain plug is removed the oil level is full.
Install the oil drain plug.
Second, check the oil
Cut off power to prevent electric shock! Wait cool gear!
Oil drain plug open play, taking oil samples.
Check the oil viscosity index
　　 - If the oil significantly turbid, it is recommended to be replaced soon.
For gear with the oil level plug
　　 - Check the oil level, eligibility
　　 - Install the oil level plug
Third, oil replacement
After cooling to increase the viscosity of the oil drain difficulties gear oil change should
be at operating temperature.
Cut off power to prevent electric shock! Wait to cool down reducer no danger of burning up!
Note: The gear oil change should remain warm.
In the oil drain plug Place a drip tray.
Open the oil level plug, breather and oil drain plug.
The oil all excluded.
Oil drain plug installed.
With the injection of new oil grades.
Oil should be consistent with the installation location.
Check the oil level at the oil level plug
Tighten the oil level plug and breather
According to conditions of continuous belt conveyor, impact load type, peak load
conditions and manufacturing quality to press DBY, DCY choose manual election retarder and
mechanical strength, thermal power and critical speed check.
Mechanical strength, thermal power check in the section "tapered cylindrical gear reducer
selection of Atlas" (ZBJ19026-90) in the checking method.
Critical speed check
Critical speed check-axis:
n <0.75n C1
Where: n - reducer input shaft speed r / min
n C1 - permissible speed r / min
n C1 is calculated with reference to the table concerning the calculation of 8-377.
5 The role of hydraulic coupler
Liquid as the working medium of a non-rigid coupling, also known as hydraulic couplings.
Hydraulic coupling ( see Figure ) consisting of a pump wheel and a turbine enables a closed
circulation of fluid working chamber, a pump wheel mounted on the input shaft , a turbine
mounted on the output shaft. When the power machine (engine, electric motor, etc.) to drive
the input shaft rotates, the centrifugal pump liquid is thrown off the wheel. This high-
speed liquid enters the turbine after turbine to rotate the impeller obtained from the
transfer of energy to the output shaft. Finally, the liquid return pump wheel, forming a
cycle of flow. By hydraulic coupling liquid and the pump wheel, turbine blades changes the
momentum generated by the interaction torque moment to pass. It is equal to the input torque
of the torque output by subtracting the friction torque, it is always smaller than the
output torque of the input torque. Hydraulic coupling between the input shaft and the output
shaft by the fluid contact, there is no rigid connection between the working member.
Hydraulic coupling characteristics are: to eliminate shock and vibration; output speed is
lower than the input speed, the speed difference increases with increase in both axes with
load ; overload performance and good starting performance , the load is too large to stop
input rpm still rotating shaft , without causing damage to the power machine ; When the load
decreases, the rotational speed of the output shaft speed increases until close to the input
shaft. Transmission fluid coupling efficiency is equal to the output shaft speed multiplied
by the output torque (power output) and the input shaft speed multiplied by the input torque
(input power) ratio. General hydraulic coupling the speed of normal working conditions than
0.95 obtain higher efficiency over time. Hydraulic coupling characteristics due to the
working chamber and the pump wheel, turbine shapes differ. If the coupling of the oil vent,
couplers is in disengaged state, can play the role of the clutch.
Fluid coupling power transmission coupling of the impeller is no mechanical contact with two
impellers connected by a hydraulic oil power. In the coupler closed housing with two
impellers and supporting mechanical power transmission equipment, which is called the active
pump impeller wheel, another called turbo. Rounds the half-ring radially arranged plurality
of blades, which are arranged opposite the coupling, do not touch the middle of 3mm to 4mm
gap and forming an annular working wheel. Engine crankshaft driven pump impeller, a turbine
associated with the output shaft. Coupler housing filled with hydraulic oil. When the
impeller rotates, the blade drive fluid, the centrifugal force, the oil thrown from the edge
of the impeller blades, and the impact turbine blades, the turbine rotates. Under inertia,
rushed into the turbine turbine oil edge and back edge of the pump wheel. Again and again.
Classification of hydraulic coupling
Depending on the application, fluid coupling into the fluid coupling constant filling
and variable speed hydraulic coupling. Which limit filling hydraulic coupling is mainly used
for motor reducer start running protection and impact protection, position compensation and
energy buffer; variable speed fluid coupling is mainly used to adjust the input and output
speed ratio, other functions and filling fluid coupling limit is basically the same.
Reference material
7. Mechanical Design Handbook ( Chemical Industry Press )
8. Crane Design Manual
9. Belt conveyor design manual
10. Not limited Introduction ( People's Education Press )
11. JSOSO49 / 1
12. Design of steel structures TJ17-749 trial )

Design Experience
Through this final project, so I'm under the teacher's guidance and their own efforts
to complete disdain the "DTII -belt drive design "tasks encountered in the process of
the formation of many difficulties, but I have been all the solutions. However, there is
insufficient memory in many ways, I hope you can get the teacher's understanding.
The design, mechanical design and I have a deeper understanding of CAD
drawing aspect. This hands-on, so I met a lot of incredibly issues in the design process,
which is due to previously learned theoretical knowledge can not be combined with a
good time, did not mastery, at design time can not come in handy , skilled application.
A professional learning is not easy, and requires that each learning are consistently
learning attitude, learning to overcome problems and difficulties of the spirit, willing to
study, willing to suffer, confident, believe eventually successful day .
In this, I am very grateful to my instructor and all the leaders, classroom teacher,
you taught me a lot in the community can learn the knowledge, but also tell me the truth,
I'll bear that in mind, thank you again!
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