The cantilever of the stacker can be tilted without being tilted at a 90° angle to the track of the trolley. It can also be pitched. Generally, a stacker that can pitch is used, so that the ore drop can be controlled to a minimum when unloading. Due to the different weight positions of the rotary cantilever belt stacker, there are two types, high and low, as shown in Figures 4 and 5, respectively. When used, it can be selected according to the different requirements of the material yard. For the open field, the high and low weight structure can be selected. For the storage yard, the low-weight structure should be used to reduce the space of the workshop. The cantilever belt stackers of various specifications that have been produced and used in China have a maximum radius of gyration of up to 43 meters. 2 Bridge Drum Reclaimer Bridge Drum Reclaimer, as shown in Figure 7. It replaces the bucket wheel with a rotating drum that is almost the same length as the bottom of the pile. A certain number of buckets are arranged at appropriate positions around the drum cylinder, and the number of the buckets is arranged according to the principle that the intermediate cross-section of the pile is large and the materials on both sides are small, so that the buckets on the drum have more intermediates and less sides. When the drum rotates, the ore is shoveled into the bucket by the bucket and discharged to the belt conveyor across the center of the drum to carry the ore out. The reclaimer of this reclaimer is larger than the bucket reclaimer. It is a one-piece or two-half large triangular truss that can almost completely cover the take-up slope of the pile. In this way, the ore on the take-off slope is simultaneously dropped to a certain amount to the bottom of the pile, and is scraped off by the bucket on the rotary drum. Truck Cranes,Truck Crane,Portable Cranes,Crawler Crane XCMG E-Commerce Inc. , https://www.usedmachinemkt.com
   1 The type of stacker should meet the requirements of the stacking method. 
7 Stacker When stacking the herringbone pile, make the top of the pile on a vertical line.
The end material composition at both ends of the 8 piles fluctuates greatly. In the production, the part of the material is often taken out and then returned to the pile. In order to reduce the fluctuation of the end material composition, the following different cloth methods are adopted: [next]
a. The method of fixing the starting point and ending point. This method is relatively simple, but there are more end materials;
b. The cloth method of changing the starting point and ending point. This kind of cloth method is more complicated for the operation of the stocker, but the advantage is that the segregation of the end material and the fluctuation of the composition are avoided;
c. Cloth method for changing the starting point and fixing the end point. This method of weaving reduces the unevenness of the end material and simplifies the operation as much as possible, but there is still an end material of uneven quality.
(2) Selection of stacker The choice of stacker is as follows:
1 Fixed cantilever belt stacker has two kinds of single-wing cantilever stacker and two-wing cantilever stacker, as shown in Figure 2 and Figure 3. When used, it can be selected according to the layout of the material yard. If a two-span material yard is used, a double-wing cantilever stacker can be used, which can stack materials on both sides of the stacker. If a single-span stockyard is used, a single-wing cantilever stacker is available.
The fixed cantilever stacker is only suitable for herringbone or conical piles. In order to keep the tip of the pile in a straight line in the longitudinal direction, a baffle or cloth funnel is required at the end of the unloading belt conveyor of the stacker. Control the location of the stream drop point.
2 rotary cantilever belt stacker, as shown in Figure 4. It has a turning device that can rotate in the range of ±90° to 120°, so it is flexible in stacking, and its cantilever can pitch, control the unloading drop and reduce dust generation. It can be used for one side stacking or for stacking on both sides. It is suitable for various fabrics, such as herringbone fabric, trapezoidal fabric and diamond fabric.
Figure 4 High-type rotary cantilever belt stacker
1. cantilever frame; 2. tie rod and bracket; 3. driver's cab; 4. slewing mechanism;
5. Walking trolley; 6. Stacking belt conveyor; 7. Main belt conveyor [next]
Figure 5 Â Low-profile rotary cantilever belt stacker
1—main belt conveyor; 2—stack belt conveyor; 3—carriage; 4—weight
The main technical parameters of the cantilever belt stacker manufactured in China are shown in Table 1.
The reclaimer is the main equipment for blending and mixing the material yard. Its type structure can affect the blending and mixing effects. At present, the reclaimers commonly used include bridge type single bucket wheel, bridge type double bucket wheel and bridge type roller.
(1) Requirements for the reclaimer The requirements for the reclaimer are as follows:
1 When reclaiming the material, the material can be cut perpendicular to the material layer and cut at the same time, and the thickness of each layer is equal to ensure uniformity.
2 The reclaiming amount of the reclaimer can be quantitatively reclaimed within a certain range according to the specified value and can be kept stable.
3 In the process of reclaiming, the cross section of the pile can be kept flat without causing collapse.
4 With loose material, the surface of the pile can be loosened and the amount of falling ore can be stabilized.
5 can be controlled by electronic computer to achieve automatic operation.
6 The environment is less polluted and less dusty.
(2) Selection of reclaimer 1 bridge type bucket wheel reclaimer Bridge type bucket reclaimer has two kinds of single bucket wheel and double bucket wheel, which are selected according to production requirements, generally less or less than the medium. The single bucket wheel reclaimer can be used. If the material is large and the mixing effect is high, the double bucket reclaimer is usually used. The double bucket wheel reclaimer is shown in Figure 6. The bucket wheel reclaimer cannot take the material from the entire section of the pile, so there is a problem of composition fluctuations, and the single bucket wheel is even worse. In order to make the double bucket wheel reclaimer overcome the unevenness of the material of the take-up section, the distance between the two bucket wheels is set to be half of the width of the bottom edge of the pile. When one bucket wheel is located in the middle of the pile, the other bucket wheel Then on the side of the pile.
In order to obtain a uniform balance of the material, the traveling speed of the trolley of the single bucket wheel reclaimer is variable, and gradually decelerates as it goes toward the center of the pile, and gradually accelerates toward the pile side. The double bucket wheel reclaimer generally does not need speed regulation, but when the reclaiming capacity is large and the span is also large, the two bucket wheels need to be slowed to the middle and fast to both sides.
The double bucket wheel reclaimer has two types: ordinary bridge type and spiral bridge type. When the common bridge type bucket wheel reclaimer is used for the two-span material pile, it is necessary to take measures to cross the trolley when crossing the cross, and the swing bridge The bucket wheel reclaimer can be rotated over the span.
Regardless of the single bucket wheel or the double bucket wheel reclaimer, there must be a loose material device, ie loose material. If two-way reclaiming is carried out, the loose material is installed on both sides of the trolley, and the loose material not only loosens the surface ore of the pile section, but also causes the ore to be quantitatively rolled down to the bottom of the pile to make the ore better. Mix well. The loose material can prevent the top of the pile from collapsing and the working condition of the bucket wheel is not affected.
According to different scales and different use conditions, different sizes of reclaimers are selected.
At present, the domestically produced bucket wheel reclaimer has a reclaiming capacity of 100 to 1500 tons per hour and a span of 20 to 40 meters.
The main technical parameters of the bucket wheel reclaimer are shown in Table 2. [next]
The bridge type drum reclaimer is used for large-scale ore blending and mixing yards. Most of the foreign use is more than 1000 tons per hour, and the maximum is 6,000 tons per hour. The reclaimer has been designed and manufactured at the Harbin Heavy Machinery Plant in China, and the production capacity can be selected according to user requirements.
The main technical parameters of the reclaimer are shown in Table 2.
Stacking and reclaiming equipment
   1. Requirements and selection of stacker
   (1) Requirements for the stocker
   The requirements for the stocker are as follows:
   2 When the incoming material reaches the head of the stacker cantilever belt conveyor, the stacker can run immediately. When there is no incoming material, the running stops.
   3The dust is less, and the machine is equipped with dust removal and sprinklers.
   4 There are various control devices that can be operated automatically with the computer.
   5 The head of the cantilever belt conveyor of the stacker is equipped with a pile height detector, which can pitch at a certain pitch with the height of the pile.
   6 The walking speed of the stacker can maintain the same thickness of the flat layer in the forward or reverse direction. The relationship is as follows:
   Because q 1 =q 2 , finishing
                                                          Â
   Where q 1 — the amount of stock when the stacker is walking in the direction, t/m·layer;
q 2 - the amount of stock when the stacker is walking in reverse, t/m·layer;
Q 6 — the amount of material transported by the main belt conveyor, t/h;
υ 1 — stacking machine running speed, m/min;
υ 2 — reverse walking speed of the stacker, m/min;
υ — Feeding main belt conveyor speed, m/min
In the design of the mixing machine of Baosteel raw material workshop, υ=120 min/min, υ1=20 m/min, υ=30 m/min, so that the theoretical values ​​of the forward and reverse unit fabrics are equal.
Table 1 Â Main technical parameters of the stacker
parameter name
Cantilever
DB30037
Cantilever
DB1900 33
Cantilever
DB3600 43
Cantilever
DB3600 42
Fixed arm wing
SBD500 15
Cantilever
DB800 20
user
Qinhuangdao Port
Qinhuangdao Port
Shanxi Yangquan Coal Mine
Shantou Port
Use material type
raw coal
Loose density
2.2t/m 3
Loose density
1.6t/m 3
raw coal
raw coal
raw coal
Production capacity, t/h
3000
1900
3600
3600
500
800
Stacking height, m
16
13
12.44
15
10
10
Radius of gyration, m
37
33
43.6
42
-
20
Gauge, m
6*6
8*8
8*8
8*8
4*5
5
walk
speed
high speed
m/min
30
Speed ​​30
30
30
-
30
Low speed
m/min
7
Reverse speed 20
15
15
7
7
Unloading skin
Belt machine
Bandwidth, m
1.6
1.2
1.6
1.8
0.8
1
Speed ​​m/s
3.68
2.5
3
4
2
2.5
turn around
angle
left)
100
90
135
135
-
110
right)
100
90
135
135
-
110
Discharge arm length, m
37
33
43.6
42
15
20
Wheel pressure, t
twenty one
20
20
13
13
15
Wind pressure Pa (kg/m 2 )
jobs,
Pa
245.16 (25)
245.16 (25)
245.16 (25)
245.16 (25)
245.16 (25)
245.16 (25)
Non-working
Pa
784.5(80)
784.5(80)
784.5(80)
784.5(80)
784.5(80)
1176.8 (120)
Total weight of equipment, t
318
250
415
430
43
90
Total installed power, kW
380
180
330
330
94
100
2. Requirements and selection of the reclaimer [next]
Figure 6 Bridge type double bucket wheel reclaimer
1—bridge; 2—bucket wheel mechanism; 3—feeding;
4—driver's cab; 5—trailer; 6—discharge belt conveyor
The bucket of the bucket wheel reclaimer has a fixed and reversible direction in the shovel. If the stock picking is fixed in one direction, the bucket direction can be fixed. If it is used between two piles of two piles or two piles of four piles, two-way reclaiming is required, and the bucket direction is reversible.
Table 2 Technical parameters of mixing and reclaiming machine
parameter name
Bridge roller
Reclaimer
GHQ1500
Bridge roller
Reclaimer
GHQ300
Bridge double bucket
Wheel reclaimer
SHQ1500
Bridge bucket wheel
Reclaimer
7116A
Bridge bucket wheel
Reclaimer
QQ10028
Production capacity, t/h
1500
300
1500
100
100
Reclaiming height, m
13
5
13
6.8
6.8
Walking speed m/min
high speed
30
12.2
12.2
Low speed
0.05
0.0268
7
1.8
1.8
Discharge tape machine
Width, m
1.2
0.8
1
0.5
0.5
Belt speed, m/s
2
2
2.5
1.6
1.6
roller
Diameter, m
5.6
2.6
Speed, r/min
3
3
Bucket wheel
Diameter, m
5.3
3
3.2
amount
2
1
1
Span, m
40
10
40
20
28
Wheel pressure, t
20
10
25
12
12
Wind pressure, Pa (kg/m 2 )
jobs
245.16 (25)
245.16 (25)
245.16 (25)
245.16 (25)
245.16 (25)
Non-working
784.5(80)
784.5(80)
784.5(80)
784.5(80)
784.5(80)
Total weight of equipment, t
410
42
280
44
48
Total installed power, kW
344
80
250
32
32
Figure 7 Bridge drum reclaimer
1—gantry; 2—carriage; 3—driver; 4—roller; 5-truss;
6—feeding reciprocating mechanism; 7—feeding pitching mechanism; 8—discharging belt conveyor
The ore composition taken out of the drum reclaimer is nearly constant, which is much more uniform than the material taken out of the bucket reclaimer. Because the change cycle of the discharge composition of the drum reclaimer is the time of one rotation of the drum, the cycle of the material is significantly reduced correspondingly to the short cycle. The change cycle of the discharge component of the single bucket wheel reclaimer is the time when the bucket wheel traverses the entire pile once, and the corresponding batch of materials is also large. The change cycle of the discharge composition of the double bucket reclaimer is reduced by half time compared to the single bucket wheel, so the uniformity of the material taken out is higher than that of the single bucket wheel reclaimer.