This standard specifies the laboratory test method for determining the static ramp capacity of the fluid system (engine, transmission system, fuel system, oil system, etc.) of construction machinery during operation. The ramp limit value of the fluid system of construction machinery is a performance parameter for evaluating the static ramp capacity. The preferred method for static ramp capacity testing is to place the machine on an inclined workbench or a specially made ramp. Another optional method is to test the entire fluid system on a test bench. Each method should have measures to ensure safety. This standard applies to construction machinery defined in GB 8498 and equipped with standard working devices. JB/T 7691-1995 Ramp limit value (static) test method for the operation of the fluid system of construction machinery JB/T7691-1995 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
JB/T7691-1995
eqvIS010266-1992bZxz.net
Construction Machinery
Machine Liquid System Operation
Slope Limit Value (Static) Test Method
1995-06-20 Issued
Ministry of Machinery Industry of the People's Republic of China
Implementation on 1996-01-01
JB/T7691-1995
This standard is formulated based on ISO10266-1992 "Earth-moving Machinery-Determination of Slope Limit Value of Machine Liquid System Operation-Static Test Method" drafted by ISO/TC127 Earth-moving Machinery Technical Committee of the International Organization for Standardization. The technical content is equivalent to that of the international standard, and the writing rules are equivalent to the contents specified in this standard. It is the most basic requirement for evaluating the static slope capacity of the liquid system operation of construction machinery. The ramp limit value of the operation of the liquid system of engineering machinery is one of the important indicators of product quality and operation adaptability, and is a key item for testing the operation and operation safety of engineering machinery products. By adopting international standards as our standards, we can promote and standardize the evaluation and test methods of the ramp limit value of the operation of the nuclear liquid system of engineering machinery in my country, so that the evaluation criteria of the static ramp capacity of engineering machinery can be universally used internationally, so as to adapt to the needs of international trade, technology and economic exchanges as soon as possible. According to the provisions of 4.2.3.2 of GB/T1.1-1993, the foreword of the international standard is retained, and the "foreword" is added. Appendix A of this standard is the appendix of the standard.
This standard is proposed and managed by Tianjin Engineering Machinery Research Institute of the Ministry of Machinery Industry. The drafting unit of this standard: Guanjin Engineering Machinery Research Institute of the Ministry of Machinery Industry. The main drafters of this standard: Wu Runcai and Yang Yaozhu. JB/T7691-1995
ISO (International Organization for Standardization) is a global alliance of national standard groups (ISO member countries), and the formulation of international standards is usually carried out by ISO technical committees. Each member country has the right to participate in established technical committees and in subjects of interest. International organizations, governmental and non-governmental, in liaison with ISO, may also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) for electrotechnical standardization.
Draft international standards are circulated by technical committees to member countries for voting. Publication as an international standard requires a vote by at least 75 % of the member countries.
International Standard ISO 10266 was prepared by Technical Committee ISO/TC 127, Earth-moving machinery, Subcommittee SC 1, Test methods for machine performance.
Annex A forms an integral part of this International Standard. 1 Scope
Machinery Industry Standard of the People's Republic of China
Slope Limit Value (Static) Test Method for Engineering Machinery Fluid System Operation
JB/T 7691-1995
eqvIS010266-1992
This standard specifies the laboratory test method for determining the static ramp capacity of engineering machinery fluid system (engine, transmission system, fuel system, oil system, etc.) during operation. The slope limit value of engineering machinery fluid system operation is a performance parameter for evaluating static ramp capacity. The preferred method for static ramp capacity testing is to place the machine on an inclined workbench or a specially made ramp. Another optional method is to test the entire fluid system on a test bench. Each method should have measures to ensure safety. This standard applies to engineering machinery defined in GB8498 and equipped with standard working devices. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of this standard, the versions of the following standards are valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB8498-87 Basic Types of Earthmoving Machines Terminology 3 Definitions
This standard adopts the following definitions.
3.1 Machine orientation: The position of the machine's weaving axis on the slope (expressed in degrees). The front end of the machine is zero when it is uphill, and the other positions are measured clockwise from the zero position.
3.2 Operating equilibrium temperature: During operation, the change in liquid temperature does not exceed 2°C per minute. 3.3 Liquid system: Cooling, lubrication, control and transmission systems and fuel systems using oil or water media. 3.4 (Machine) Static ramp capacity: The maximum slope at which the machine's liquid system can operate normally (without any fault or damage to the liquid system) in the machine orientation specified in 3.5 and 3.6, expressed in degrees. 3.5 (Machine) Longitudinal static ramp capacity: The maximum longitudinal slope, expressed in degrees, that the machine (i.e., at machine orientations of 0° and 180°) can achieve within the performance parameters during the determination of the static ramp capacity. 3.6 (Machine) Transverse static ramp capacity: The maximum transverse slope, expressed in degrees, that the machine (i.e., at machine orientations of 90° and 270°) can achieve within the performance parameters during the determination of the static ramp capacity. 4 Test equipment
4.1 Place the machine on an inclined platform or a specially constructed ramp of the required slope. 4.2 Suitable equipment to restrain the machine on the ramp in a safe position. This is to prevent the machine from tipping over before the limit values ​​of the fluid systems are reached.
4.3 Suitable instruments to detect the pressure and temperature of the various fluid systems and to detect the slope of the ramp. 5 Measuring equipment and accuracy
The accuracy of the measuring equipment shall comply with the provisions of Table 1. Approved by the Ministry of Machinery Industry on June 20, 1995
Implemented on January 1, 1996
6 Machine Preparation
Measured Parameters
Ramp Angle
Engine Speed
Machine Azimuth Angle
JB/T 76911995
±2% of the maximum value
6.1 For machines equipped with a rollover protective structure (ROPS) or capable of using ROPS, the ROPS should be installed during the test. For machines that cannot be equipped with ROPS, special safety measures should be considered. During the test, a driver should sit in the driver's work position of the machine. 6.2 Before conducting the ramp test, the liquid level of the liquid system should be at the minimum level specified by the manufacturer. At the operating equilibrium temperature, check the liquid level of the system and the fuel tank should be filled with fuel.
6.3 Record the pressure of the liquid system and tires (wheeled machines) to ensure that they meet the manufacturer's technical requirements. 7 Ramp Capacity
7.1 The machine is placed on an inclined platform or a special ramp, and its orientation and lateral position are in accordance with the provisions of 3.5 and 3.6. Other orientations may also be selected according to the design requirements of each liquid system and the position on the machine. To ensure that the machine does not tip over or slide during the test, the machine should be fixed.
7.2 The engine is operated within its speed range, and each liquid system is within its maximum operating range until each liquid system reaches the equilibrium temperature of the operating range specified by the manufacturer. 7.3 The engine is operated at the highest speed, and the pressure and temperature of each system are recorded every 5 minutes until each liquid system reaches equilibrium or exceeds the manufacturer's recommended value or the following conditions occur: a) The pressure of any system has dropped to less than 90% of the pressure recorded in 6.3; b) Any system has leakage, noise, abnormal liquid temperature, etc. 7.4 Repeat the tests of 7.1 to 7.3 at other positions and ramps of the machine according to design requirements to achieve the ramp capacity specified by the manufacturer.
7.5 Repeat the tests of 7.1 to 7.4 at the highest position of the liquid level of each liquid system. Criteria
The ramp capacity of the machine liquid system defined in 3.4 shall comply with the provisions of 7.3. Recording of test results
The test results shall be summarized in the format of Appendix A (Standard Appendix). 2
Testing organization
Machine manufacturing plant
Attachment
Engine manufacturing plant
High-speed air
Gearbox manufacturing plant
Ring amber crystallinity
Machine position
Delivery capacity
Minimum liquid level
Maximum liquid level
JB/T 7691-~1995
Appendix A
Format of test report
(Appendix to the standard)
Factory number
Factory number
r/min·Low speed no-load
Sequence number
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