This standard specifies the type, basic parameters, technical requirements, test methods, marking, packaging, transportation and storage of hydraulic buffers for cranes. This standard applies to buffers for cranes, and also applies to buffer devices used by other equipment to prevent rigid collisions during operation or at the end of operation. JB/T 7017-1993 Hydraulic buffer for cranes JB/T7017-1993 Standard download and decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
Hydraulic buffer for cranes
1 Subject content and scope of application
JB/T 7017 --- 93
This standard specifies the requirements for cranes Terminology, type, basic parameters, technical requirements, test treatments, inspection rules, marking, packaging, transportation and storage of hydraulic buffers (hereinafter referred to as buffers). This standard applies to buffers for cranes and other equipment in operation. A buffer device used to prevent rigid collisions at a process or operating terminal.
2 cited standards
GB699 high-quality carbon structural steel technical conditions
GB700
carbon structural steel
spring steel
GB1222| |tt||GB 1239. 4
GB3811
GB8923
GB9286
GB11352
Hot rolled cylindrical coil spring technical conditions
Crane Design specifications
Cross-hatch test of paint and varnish film on steel surface corrosion grade and rust removal grade before painting
Casted carbon steel parts for general engineering
GB/T 13306| |tt||GB/T 13384
3 terms
buffer capacity
3.1
signs
general technical conditions for mechanical and electrical product packaging
The rated collision energy that the buffer can absorb is expressed in W. 3.2 Buffer stroke
The maximum displacement of the buffer rod, represented by S, 3.3 Buffer force
The average resistance produced by the buffer in the process of absorbing the rated collision energy. Use to express. 4 Type and basic parameters
4.1 High-frequency one-way hydraulic buffer (codenamed HYGI), the collision frequency does not exceed 1 time per minute, and its type and basic parameters should comply with the regulations in Figure 1 and Table 1.
4.2 low-frequency single-question hydraulic buffer (codenamed HYDI). The frequency of collisions shall not exceed 10 times a day. Its type and basic parameters shall comply with the provisions of Figure 2 and Table 2
4.3 The low-frequency two-way hydraulic buffer is code-named HYDS. The frequency of collisions shall not exceed 10 times a day. , its type and basic parameters should comply with the provisions of Figure 3 and Table 3
The Ministry of Machinery Industry of the People's Republic of China approved on 1993-09-21 and implemented on 07-01
131
HYGD 2-60
HYGD 4-90
HYGD 6-80
HYGD 8-110
HYGD 12-90
HYGD 18-120|| tt||HYGU) 25-130
HYGD 40-180
HYGD 56-200
HYG1) 80-270
HYG) 125-220)||tt ||HYGD180-320
HYGD250-270
HYGI) 355-350
132
Figure
IB/T7017—93
HYGI high-frequency one-way hydraulic buffer
table
buffer stroke"
buffer capacity
buffer force
：
F
k·m
4.
80
12.5
40
56
80
180
250
355
mm
6o
90
p
110
120| |tt||130
180
200
270
220
320)
270)
350| |tt||kN
-
45
75
15
200
230
280|| tt||300
7
57
5
1020
D
127
299||tt| |Main size
mm
280
355
8
3:1
125
60||tt || Heavy Education
ka
Type
No.
HYDDA·50
HYUI) 7-100
HYDD 10-70| |tt||HYDD 16-150
HYDI) 25-80
HYDD 31. 5-150
HYDD 40-100
HYUI) 50-150|| tt||HYUD 63-100
HYDD 100-200
HYDD 140-15C
HYDD 200-250
HYID 250-250
HYD0 315 -100
buffer capacity
W
kN·m
4.0
7.1
10
16||tt ||25
31.5
50
63
100
140
200
250
313
JB/T 7017-93
?
Figure 2HYII) Low frequency one-way hydraulic buffer Table 2
Buffer stroke
S| |tt||mm
50
100
70)
150
80
150)
100| |tt||150
100
200
150
250
250
400
Buffering force|| tt||F
kN
80
75
15)
110
315
.1|| tt||3.5
630
500
935
800
1000
800
92||tt| |92
130
130
170
i
53
35E
Main size
240
h
295
2(
360
2
130
in
S
40
251
500
133
Type
HYDS 4-50
HYIDS 10-70|| tt||HYDS 25-80
Buffer capacity
kN?m
4.0
10
25
Model representation method and marking Example
5
Model representation method
port 00
HY
a-46
JB/T7017
93
HYDS25-80 installation dimensions
390
330
Figure 3 HYDS low-frequency two-way hydraulic buffer Table 3
Buffer stroke
5
mm
50
70
80
Buffering force
F
kN
80
150
313
Buffer stroke.mm
Buffer capacity.kV·m
1
+
[130180
Card size mm
400118011401100
01230/180
[170|100|640|320|260
50:30
3..-.26
Weight
Type (high frequency one-way type is GD ), low-frequency one-way type is DD), low-frequency two-way type is DS) hydraulic buffer
b. Marking example
High frequency one-way buffer, buffer capacity is 8.0kN·m, buffer stroke is 110mm, mark: HYGD 8-110
Low frequency one-way buffer.buffer Capacity is 4.0kN·m, buffer stroke is 50mm. Marked as: 134
HYDD 4-50
JB/T 7017--93
low frequency two-way buffer, buffer The capacity is 4.0kN·m, and the buffer stroke is 50mm. Marked as: HYDS 4-50
6 Technical requirements
6.1 Environmental conditions
The buffer should be able to work normally under the following conditions : a. Ambient temperature - 20 ~ +55C;
The angle between the axis of the buffer piston rod and the running direction of the magnetic collision object should be less than 2°; b.
Buffer head and collision The angle between the baffles should be less than 2°. c
6.2 Usage performance
6.2.1 Buffer capacity
The buffer capacity should not be less than the provisions of Table 1, Table 2 and Table 3. 6.2.2 Buffer stroke
The buffer stroke should comply with the provisions of Table 1, Table 2 and Table 3, with a tolerance of ±3%. 6.2.3 Dynamic buffering characteristics
When the collision mass is constant, and the buffer is magnetically impacted at different collision speeds without exceeding the buffering capacity, the shape of the dynamic buffering characteristic curve should be similar, and the stroke should not be less than 85% Buffer stroke, dynamic characteristic curve (see Figure 4) value F, the ratio to the average value F is not greater than 1.5.
Figure 4 buffer characteristic curve
6.3 Overload performance
The buffer selected for not less than 70% of the rated operating speed of the crane should be able to stop the crane safely when it collides at the rated operating speed.
6.4 Sealing performance
6.4.1 Under the environmental conditions specified in Article 6.1, the buffer shall not leak oil. 6.4.2 The buffer shell shall undergo a sealing test. The test pressure shall not be less than 0.3MPa. 6.5 Safety and Health
6.5.1 The buffering process of the buffer should be smooth. When the collision body is separated from the buffer, the bumper head of the buffer should be able to reset quickly without sticking, and the seals should not be leaked or tight. Parts must not be loose, and parts must not be bent, deformed or damaged. 6.5.2 The buffer should have anti-loosening measures and an anti-corrosion layer. 6.5.3 The buffer should have installation direction marks. 6.6 Material requirements
13.5
JB/T 7017 .-93
Material requirements for main parts should comply with the provisions of Table 4, and their mechanical properties should not be lower than those of the corresponding standards. It is allowed to use Materials with equivalent or higher performance.
Table 4
Part name
Shell
Dai
Bump
6.7 Appearance requirements||tt| |Head
Mix
Spring
Steel castings
Welded parts
Material grade
ZG 230-450
Q235-A
45
60Si2M
Standard
Tan
GB 11352
GB700
GR699||tt| |GB1222
The external surface of the buffer should be free of obvious burrs, sand adhesion and welding defects. All metal parts except the mating surface should be anti-corrosion and protected. | |tt | 6.10 Before painting, the steel should undergo surface rust removal treatment in accordance with the provisions of GB8923. The treated steel surface should meet the requirements of St2 level. 7 Test method
7.1 Test conditions
7.1.1 Test environment conditions
The general test environment conditions are the same as the use environment conditions. The arbitration test environment conditions are the indoor conditions of 20C ± 2C 7.1. 2 Test equipment and instruments, meters
a.
b.
d.
e.
f.
test bench ;
Regulated power supply:
Power amplifier:
Pressure sensor:
Displacement sensor;
Photoelectric tachometer or tachometer generator: ||tt ||XY plotter or printer. | |tt | In the bench test, a collision body with corresponding movement speed and mass collides with the buffer under test. Repeat the test 3 times, and the interval between each time should be greater than 1 minute for HYGI) type, and 30 minutes for HYDD and HYDS types. Its performance shall comply with the provisions of Articles 6.2.1, 6.2.3 and 6.5.1.
7.3 Buffer stroke test
When the buffer is in a horizontal or vertical state, use the static pressure method to test the piston rod displacement three times, and the stroke of the piston rod from the top dead center in the free state to the bottom dead center. All shall comply with the provisions of Article 6.2.2. 7.4 Overload test
For small-capacity buffers, it should be carried out on test bench 7. Large-capacity buffers can be carried out at the use site, and the user will provide an on-site verification report. Both test methods shall comply with the provisions of Article 6.3. 7.5 Sealing performance test
136
JB/T 7017
93
7.5.1 The buffer should be placed horizontally for 24 hours, and there should be no oil leakage at each seal. 7.5.2 Put the shell into the water for a pressure test. The pressure should comply with the provisions of Article 6.4.2 and be maintained under the test pressure for 1 minute. No bubbles should be generated, and the indicated value of the pressure gauge should remain constant during the pressure maintaining process. Change 7.6 The surface paint quality shall be visually inspected, and the paint film adhesion shall be cut manually according to G139286. 8 Inspection rules
8.1 Inspection
8.1.1 Each buffer must be inspected by the quality inspection department before it can be released. The factory products should be accompanied by a product quality certificate. 8.1.2 Factory inspection items
a, buffer stroke inspection:
appearance inspection. | |tt | |tt||h.
C.
Once every three years during normal production;
When production is resumed after more than one year of suspension;
d.||tt| |When the quality supervision and inspection department deems it necessary. 8.2.1
Type inspection items
a.
All items for factory inspection;
b.
Buffer capacity;
c
Overload test;
d.
Sealing performance test:
e.
Cross-cut test of paint and varnish films,||tt ||8.2.2 Used as a buffer for type inspection, 10% (at least 2 units) are randomly selected for inspection according to the items specified in Article 8.2.1. All test items are qualified and deemed qualified. If any of the buffer capacity, overload test, sealing performance test, and buffer stroke fails, the bundle inspection should be doubled. If all the samples pass the double inspection, it will be deemed qualified, otherwise it will be deemed unqualified. 9 Marking, packaging, transportation and storage
9.1 Set up a product sign at a prominent position on the buffer. The sign shall comply with the provisions of GB/T13306. Its contents include: a. Product name, model:
h.
Buffer capacity, buffer stroke;
c.
Manufacturing name;
d． Manufacturing date:
e.
Dehiro number.
9.2 Packaging
9.2.1 The buffer should be cleaned before packaging, and its protective coating surface should be checked to see if it is intact. 9.2.2 The packaging box should be strong and reliable. Product packaging should comply with GB/T13384 According to regulations, 9.2.3 buffer packaging should have rainproof measures. 9.2.4 The random technical documents and spare parts are packed in plastic bags and fastened in the box. 9.3 Random technical documents
Certificate of conformity;
Operation manual;
b.
c. Packing list;
137
Operation feedback return sheet.
d.
9.4 Packing box mark
a, product name and model:
b.
Gross weight.kg:
JB/T7017
Outer dimensions of packing box (length×width×height).mm: d.
Number of products per box;
Sending and receiving stations and units:
e.
f. Rainproof mark.
9.5 Transportation and storage
9.5.1 It is strictly forbidden to invert or bump the factory products during transportation and hoisting. 93Www.bzxZ.net
9.5.2 The buffers should be stored in an environment without rain or snow, with good air circulation and no sunlight exposure. 10 Quality Assurance
If the user complies with the product storage and use regulations, the manufacturer shall repair or replace the product free of charge within 12 months from the date of delivery if it cannot work normally due to poor manufacturing quality. Additional notes:
This standard was proposed by the Beijing Hoisting and Conveying Machinery Research Institute of the Ministry of Machinery Industry and is under the jurisdiction of Nanjing Hoisting Electric Appliance Factory. The main drafters of this standard: Wang Chenglan, Wang Haiding, Zhao Qiling138
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.