JB/T 1120-1999 This standard is a revision of JB 1120-81 "Double-sided detachable connectors". During the revision, some steel grades were modified; the thickness of the round plate was personalized. This standard specifies the varieties, specifications, technical requirements, marking and packaging of double-sided detachable connectors. This standard is applicable to the connection between the tray and the tray plate of plate tower equipment in the chemical and petroleum industries. This standard was first issued in 1981. JB/T 1120-1999 Double-sided detachable connectors JB/T1120-1999 standard download decompression password: www.bzxz.net

ICS75.180
Machinery Industry Standard of the People's Republic of China
JB/T1120-1999
Double-sided dismountable fastenings1999-07-12 Issued
National Bureau of Machinery Industry
2000-01-01 Implementation
JB/T1120-1999
This standard is a revision of JB1120-81 "Double-sided dismountable fastenings". Compared with JB1120-81, the main technical content of this standard has been changed as follows: some steel grades have been modified; the thickness of the round pad has been modified.
This standard replaces JB1120-81 from the date of implementation. This standard is proposed and managed by Lanzhou Petroleum Machinery Research Institute. The responsible drafting unit of this standard: Lanzhou Petroleum Machinery Research Institute. Drafters of this standard: Dong Yiliang and Li Xianbiao. This standard was first issued in 1968; this revision is the second revision. This standard is interpreted by Lanzhou Petroleum Machinery Research Institute. 1 Scope
Machinery Industry Standard of the People's Republic of China
Double-sided dismountable fastenings
Double-sided dismountable fastenings This standard specifies the varieties, specifications, technical requirements, marking and packaging of double-sided dismountable fastenings. This standard applies to the connection between tray plates and tray plates of plate tower equipment in the chemical and petroleum industries. 2 Referenced standards
JB/T1120—1999
Replaces JB1120—81
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 96--1985
GB/T 196-1981www.bzxz.net
GB/T 702-1986
GB/T 912-1989
GB/T 12201992
Big pad drawing A and C grade
General thread basic dimensions (diameter 1~600mm) Hot-rolled round steel and square steel dimensions, shape, weight and allowable deviation Carbon structural steel and low alloy structural steel Hot-rolled thin steel plate and steel strip Stainless steel floor
I type hexagonal nut A and B grade
GB/T6170—1986
JB/T1205—1980
3 Variety specifications
Tower tray technical conditions
3.1 Double-sided detachable connector consists of studs, elliptical pads, washers and nuts. Its structure, dimensions, materials, etc. are shown in Figures 1 to 3 and Table 1. 3.2 The sum of the thickness of the applicable connected parts should not exceed 12mm. 3.3 If materials not specified in Table 1 are required, they can be separately proposed when ordering and indicated in the drawings. 4 Technical requirements
4.1 The plate used to manufacture the double-sided detachable connector shall comply with the requirements of GB/T912: the profile shall comply with the requirements of GB/T702 and GB/T1220.
4.2 The thread of the stud shall be manufactured according to the common thread of GB/T196. 4.3 The nut shall adopt the GB/T6170 large angle nut M10. 4.4 The washer shall adopt the GB/96 washer 10.
Approved by the Machinery Industry Bureau on July 12, 1999, and implemented on January 1, 2000
Liuyuan plate
Tower plate 1
JB/T1120-1999
/From any front inspection, after turning the new medical pad to the / line position, the tower plate can be freely removed Figure 1
JB/T 1120-1999
Figure 2 Oval pad
Figure 3 Stud
Round pad
Q235-A
oCr18Ni9
0Cr18Ni10T
0Cr17NiI2Mo2
Marking and packaging
5.1 Marking
JB/T1120-1999
Q235-A
oCr18Ni9 or
OCr18Ni10T
0Cr17Ni12Mo2
The marking of double-sided detachable connectors consists of two parts: -SL- means "double-sided Removable connecting parts\; number
0Cr18Ni9 or
OCr18Ni10Ti
0Cr17Ni12Mo2
Q235-A
0Cr18Ni9 or
0Cr18Ni10T
0Cr17Ni12Mo2
-A-indicates that the material of the round pad, washer and nut is Q235-A, and the material of the stud is 1Cr13; B-indicates that the material of the elliptical hot plate, pad, stud and nut is 0Cr18Ni9 or 0Cr18Ni10Ti: C--indicates that the material of the elliptical pad, washer, stud and nut is 0Cr17Ni12Mo2. Marking example:
Double-sided detachable connector made mainly of carbon steel Q235-A is marked as: Double-sided detachable connector SLAJB/T1120—1999 If the user requires, the mark can be printed on the surface of the finished product. The printing method and marking content shall be agreed upon by the supply and demand parties. 5.2 Packaging
The acceptance and packaging of double-sided detachable connectors shall comply with the provisions of JB/T1205. Each set of heavy scenery
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