Deep
groove Ball Bearing
Deep groove Ball Bearings are with the
characteristics of simply designed structures; low friction coefficient and
high limit rotational speed. Their range of application is very wide. They can
mainly carry radial load and certain thrust load. When the radial internal
clearance increased, the bearings have the functions of angular contact ball
bearings that a larger thrust load can also be carried.
Structures
1.
Basic
type 60000
Applications of this type of bearing can be
found in situations where there are no special requirements for mounting and
sealing.
2.
With
one shield (-Z) on one side or two shields (-2Z) on both sides.
The shields are made of steel sheet. Adequate lubricating grease has
been put in the deep groove ball bearings with two shields during assembling
process and there is no need to clean the bearing or add lubricant as mounting.
It is noncontact seal, and compared with deep groove ball bearings with seals,
they have less friction and suitable for applications with high rotational
speed requirement.
3.
With
one seal(-RS)on one side or two seals(-2RS)on both sides
The
seals are made of rubber with steel sheet reinforcement. It is contact sealing
that could seal much better but have high friction and low limit rotation speed
if the seals contact with the outside of the inner ring; while it is
non-contact sealing that has the same limit rotation speed as the basic type. The
lubricant has been prefilled in the bearing with seals both sides, so there is
no need to clean and fill the lubricant as mounting.
With snap ring groove on
the outer ring (-N)
The snap ring can be used to locate the
bearing in the axial direction so that the mounting in the housing is
simplified.
Cage material
Deep groove ball bearings generally use
pressed steel cages or solid cages. Phenol resin cage is suitable for
application with high limit rotational
speed.
Permissible Tilt Angle
Deep
groove ball bearings permit tilting angle between the inner ring and outer
ring. The details are listed in the Table 1.
Tolerance and
Clearance
The tolerance of deep groove ball
bearings is P0 basically. P5, P6, P4 and P2 are available for different
application.
The
radial internal clearance of Deep Groove Ball Bearing is as Table 3.
Dynamic equivalent radial load
Pr=XFr+YFa
Fr-Radial load
(kN)
Fa-Axial load (kN)
X-Radial factor
Y-Axial factor
X and Y values see Table below.
Static
equivalent radial load
P0r=Fr[kN]
P0r=0.6Fr+0.5Fa[kN]
Table
1 Permissible Tilt Angle
Radial internal clearance
The
permissible angle
0Basic group
3Group 3
4Group 4
8′
12′
16′
Table 2 Values
of X and Y
Type
of bearing
Relative axial load
Single row
Double row
e
X
Y
X
Y
X
Y
X
Y
Deep groove ball bearing
0.172
0.345
0.689
1.03
1.38
2.07
3.45
5.17
6.89
0.172
0.345
0.689
1.03
1.38
2.07
3.45
5.17
6.89
1
0
0.56
2.3
1
0
0.56
2.3
1.99
1.71
1.55
1.45
1.31
1.15
1.04
1
0.19
0.22
0.26
0.28
0.3
0.34
0.38
0.42
0.44
Table 3 Radial internal
clearance of deep groove ball bearing
μm
Nominal bore diameter d
mm
C2
clearance
Standard
clearance
C3
clearance
C4
clearance
C5
clearance
Over
To
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
2.5
6
10
18
24
30
40
50
65
80
100
120
140
160
180
200
225
250
280
315
355
400
450
500
560
630
710
800
900
1000
1120
6
10
18
24
30
40
50
65
80
100
120
140
160
180
200
225
250
280
315
355
400
450
500
560
630
710
800
900
1000
1120
1250
0
0
0
0
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
3
3
3
3
10
10
20
20
20
20
20
20
7
7
9
10
11
11
11
15
15
18
20
23
23
25
30
35
40
45
55
60
70
80
90
100
110
130
140
160
170
180
190
2
2
3
5
5
6
6
8
10
12
15
18
18
20
25
25
30
35
40
45
55
60
70
80
90
110
120
140
150
160
170
13
13
18
20
20
20
23
28
30
36
41
48
53
61
71
85
95
105
115
125
145
170
190
210
230
260
290
320
350
380
410
8
8
11
13
13
15
18
23
25
30
36
41
46
53
63
75
85
90
100
110
130
150
170
190
210
240
270
300
330
360
390
23
23
25
28
28
33
36
43
51
58
66
81
91
102
117
140
160
170
190
210
240
270
300
330
360
400
450
500
550
600
650
-
14
18
26
23
28
30
38
46
53
61
71
81
91
107
125
145
155
175
195
225
250
280
310
340
380
430
480
530
580
630
-
29
33
36
41
46
51
61
71
84
97
114
130
147
163
195
225
245
270
300
340
380
420
470
520
570
630
700
770
850
920
-
20
25
28
30
40
45
55
65
75
90
105
120
135
150
175
205
225
245
275
315
350
390
440
490
540
600
670
740
820
890
37
45
48
53
64
73
90
105
120
140
160
180
200
230
265
300
340
370
410
460
510
570
630
690
760
840
940
1040
1150
1260
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Plant protection drones need to be selected in conjunction with operational needs and services
[ China Agricultural Machinery Industry News ] In recent years, the plant protection drone market continues to erupt, the market is optimistic, but many farmers still have questions about how to choose plant protection drones and ancillary services, this article will answer these questions.
Plant protection drones need to be selected in conjunction with operational needs and services
Four reasons to apply plant protection drones
The first is high efficiency. The operating efficiency of different models is about 200-500 mu/day, and the efficiency of rough calculation is about 20-30 times that of artificial.
Secondly, it avoids damage to the farmers themselves, such as residues of agricultural products, and remote control during operation can avoid damage to the human body caused by residues of agricultural products.
Then it is for the young people to return to work, this is a sunrise industry, if you buy, you can serve farmers in some areas around, to achieve profitability.
According to data from the World Wide Web, in 1987, Japan first developed unmanned helicopters for spraying pesticides. Currently, nearly 40% of farmland control uses drones.
A securities company estimates that if China reaches the current penetration rate and frequency of use of plant protection drones in Japan, the annual market size can reach 15 billion yuan. Agricultural plant protection drones will be one of the fastest growing segments of the drone industry in the next few years.
Modern agrochemical production pays great attention to efficiency issues, and the improvement of efficiency brings about actual economic benefits. Therefore, the demand for plant protection drones in the future market will be great.
Combine job requirements and services
In addition to the complete license, qualified, the purchase of plant protection drones also need to see the supporting services. The service is divided into two parts, one part is whether the maintenance and maintenance of the machine is convenient and time-saving. A large brand of drones, many users report that repairs come and go for a month... so it is important to see if the service is convenient.
The second is to see if there is any relevant training. The plant protection drone is a technical activity, and the actual operating environment varies from place to place, so the training should be done well.
Then it is purchased according to the actual situation. At present, there are mainly two kinds of planted maintenance drones of “electric†and “oilyâ€. The “electric†plant protection drone has a load of 5-10 kg, and the “oil-moving†plant protection drone has a load of 10-20 kg.
At present, in view of the easy damage of plant protection drones, some manufacturers have developed drones with anti-collision bars.
Need to consider the corrosiveness of pesticides and pollen on the fuselage of the drone. Sometimes it is not good, the drone will be covered with spray, which is corrosive to the drone. It is recommended to consider the three-proof series of fully enclosed internal circulation. Therefore, it is necessary to combine the farmland and operation conditions of the company when selecting. You need to communicate clearly with the drone manufacturer at the time of purchase.