JB/T 7041-1993 Technical Specifications for Hydraulic Gear Pumps JB/T7041-1993 Standard Download Decompression Password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7041-93
Hydraulic Gear Pump
Published on September 23, 1993
Technical Conditions
Implemented on July 1, 1994
Ministry of Machinery Industry of the People's Republic of China
Mechanical Industry Standard of the People's Republic of China
Hydraulic Gear Pump
1 Subject Content and Scope of Application
This standard specifies the technical conditions for hydraulic gear pumps. Technical Conditions
This standard applies to hydraulic gear pumps that use hydraulic oil or other mineral oils with equivalent performance as the working medium. 2 Reference standards
GB2346
GB2347
GB2828
GB2878
GB7935
JB/T5058
JB/T7042
JB/JQ20502
3 Terminology
3.1 Rated pressure
Hydraulic and pneumatic graphic symbols
Hydraulic and pneumatic systems and components Nominal pressure series Hydraulic tickets and motor nominal row Quantity series
Dimension series and marking of mounting flanges and shaft extensions of hydraulic pumps and motors (I) Count sampling procedures and sampling tables for batch inspection (applicable to inspection of continuous batches) Hydraulic and pneumatic systems and components Oil and gas port connection thread sizes General technical conditions for hydraulic components
Guidelines for the importance classification of quality characteristics of mechanical industry products Test methods for hydraulic gear trains
Test methods for internal cleanliness of hydraulic components Part II Weighing method (trial implementation) Continuously operate within the specified speed range and ensure the highest output pressure for the design life. 3.2 No-load pressure
Output pressure not exceeding 5% of the rated pressure or 0.5MPa. 3.3 Maximum pressure
The maximum output pressure allowed for short-term operation. 3.4 Nominal speed
The maximum speed that can ensure the design life under rated pressure and specified oil inlet conditions. 3.5 Displacement
The volume of liquid discharged per revolution of the pump shaft.
3.6 Rated displacement
The nominal displacement of the product.
No-load displacement
Displacement measured at no-load pressure,
3.8Rated working condition
Working condition at rated pressure and rated speed. Approved by the Ministry of Machinery Industry on September 23, 1993
JB/T7041-93
Implemented on July 1, 1994
4Technical requirements
4.1General technical requirements
JB/T7041—93
4.1.1'The nominal pressure series shall comply with the provisions of GB2346. 4.1.2The nominal displacement series shall comply with the provisions of GB2347. 4.1.3The installation connection dimensions shall comply with the provisions of GB2353.1. 4.1.4 The oil port connection thread size shall comply with the provisions of GB2878. 4.1.5 Other technical requirements shall comply with the provisions of Articles 1.2 to 1.4 of GB7935. Note: The installation connection size and oil port thread size of the introduced products and old products shall be implemented in accordance with relevant regulations. 4.2 Performance
4.2.1 Displacement
The no-load displacement shall be within the range of 95% to 110% of the nominal displacement. 4.2.2 Self-priming
The self-priming capacity shall not be less than 16kPa.
4.2.3 Volumetric efficiency and total efficiency
Under rated conditions, the volumetric efficiency and total efficiency shall not be less than the provisions of Table 1. 4.2.4 Sound
The noise value shall not be greater than the provisions of Table 2.
Rated pressure
Rated pressure
Volumetric efficiency
Total efficiency
Volumetric efficiency
Total efficiency
4.2.5 Pressure swing
>10~25
Nominal displacement V
Nominal displacement V
>25~50
>10~25
>25~50wwW.bzxz.Net
>50~100
The outlet pressure swing value of the gear pump with a rated pressure of 2.5MPa shall not be greater than ±0.2MPa. There is no such requirement for gear pumps of other pressure levels. 4.2.6 Low temperature performance
During the low temperature test, there shall be no abnormal phenomenon. 4.2.7 High temperature performance
During the high temperature test, there shall be no abnormal phenomenon. 4.2.8 Low speed performance
During the low speed test, the rated pressure can be maintained at a stable output, the volumetric efficiency shall not be less than 60%, and the speed shall not be higher than 800r/min.
Overspeed performance
During the overspeed test, there shall be no abnormal phenomenon. 4.2.10 External leakage:
Static seal: no oil leakage;
Dynamic seal: no oil dripping within 4 hours.
4.2.11 Durability
JB/T7041-93
4.2.11.1 For the durability test, one of the following options may be selected: a. Full load test for 3000b;
Overload test for 100h, impact test for 400,000 times (carried out on 2 pumps respectively), Note: For special requirements, it may be carried out according to special technical specifications, 4.2.11.2 After the durability test, the decrease in volumetric efficiency shall not be greater than 4 percentage points; parts shall not have abnormal wear and other forms of damage.
4.3 Processing quality
According to JB/T5058, the importance of processing quality characteristics is divided into grades. The qualified quality level (AQL value) is specified in Articles 6.2.3.1 and 6.2.3.2.
4.4 Assembly quality
The technical requirements for component assembly shall comply with Articles 1.5 to 1.8 of GB7935. 4.4.1 Air tightness
During the air tightness test, there shall be no air circulation. 4.4.2 Internal cleanliness
The detection method shall be in accordance with JB/JQ20502. The mass of dirt in the inner cavity shall not exceed the requirements of Table 3. Table 3
Nominal displacement V
>10~50
>50~100
>100~200
4.5 Appearance requirements
Aluminum bright body
≤100
Appearance requirements shall comply with the provisions of Articles 1.9 to 1.10 of GB7935. Test method
According to the provisions of JB/T7042.
6 Inspection rules
Inspection classification
Product inspection is divided into type inspection and factory inspection. 6.1.1 Type inspection
Special iron shell
≤150
≤200
≤250
Type inspection refers to the comprehensive assessment of product quality, that is, comprehensive inspection according to the technical requirements specified in the standard. Type inspection should generally be carried out in any of the following situations. a.
Trial production and identification of new products or old products transferred to factory production: after formal production, if there are major changes in structure, materials, and processes that may affect product performance; h.
JB/T 7041-93
In normal production, regular inspection (usually 5 years) or periodic inspection after accumulating a certain amount of production: d. When the product is resumed after a long period of suspension; when the factory inspection results are significantly different from the last type inspection results; e.
When the national quality supervision agency proposes a type inspection requirement. 6.1.2 Factory Inspection
Factory inspection refers to the various tests that must be carried out on each product when it is delivered. 6.2 Sampling
The sampling plan for batch products shall comply with the provisions of GB2828. Type test inspection:
Qualified quality level (AQL value): 2.5;
Sampling plan type: normal sampling plan: Sample size: 5 units.
Note: The number of samples allowed for durability test may be reduced. 6.2.2 Internal cleanliness inspection:
Qualified quality level (AQL value): 2.5; Sampling plan type: one normal sampling plan; Inspection level: special inspection level S-2.
Parts processing quality inspection:
6. 2. 3. 1
Key characteristics (A level):
Qualified quality level (AQL value): 1.0: Sampling plan type: two normal sampling plan; Inspection level: general inspection level I.
6.2.3.2 Important characteristics (B level):
Qualified quality level (AQL value): 6.5;
Sampling plan type: two normal sampling plan; Inspection level: general inspection level 1,
6.3 Judgment rules
According to GB2828.
6.3.1st sampling plan
According to the results of sample inspection, if the number of unqualified (non-conforming products) found in the sample is less than or equal to the qualified judgment number, it is judged as qualified; if the number of unqualified (non-conforming products) found in the sample is greater than or equal to the unqualified judgment number, it is judged as unqualified. 6.3.2 Second sampling plan
According to the results of sample inspection, if the number of unqualified (non-conforming products) found in the first sample is less than or equal to the first qualified judgment number, it is judged as qualified; if the number of unqualified (non-conforming products) found in the first sample is greater than or equal to the first unqualified judgment number, it is judged as unqualified. If the number of unqualified (non-conforming products) found in the first sample is greater than the first qualified judgment number and less than the first unqualified judgment number, the second sample is drawn for inspection. If the sum of the number of unqualified (non-conforming products) found in the first and second samples is less than or equal to the second qualified judgment number, it is judged as qualified. If the sum of the number of unqualified (non-conforming products) found in the first and second samples is greater than or equal to the second unqualified judgment number, it is judged as unqualified.
7 Marking, packaging, transportation and storage
Marking, packaging, transportation and storage are in accordance with the provisions of Articles 1.9, 1.11 and Chapter 3 of GB7935, with additional notes:
JB/T7041-93
This standard is proposed by the National Hydraulic and Pneumatic Standardization Technical Committee. This standard is under the jurisdiction of the Beijing Institute of Automation of the Ministry of Machinery Industry. This standard is drafted by the National Hydraulic Component Quality Supervision, Inspection and Testing Center. The main drafters of this standard are Zhu Peihua, Yin Guohui and Peng Ping.
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