JB/T 10051-1999 General technical requirements for hydraulic systems of metal cutting machine tools
Some standard content:
JB/T10051—1999
This standard is a revision of ZB3J50016—89 “General Technical Requirements for Hydraulic Systems of Metal Cutting Machine Tools”. During the revision, the original standard was edited and the technical content was changed as follows: the original 3.3.7 deleted the words "for complex hydraulic systems, the exposed" and changed it to "the pipelines should be marked and distinguished by coating materials of different colors"
- the original 3.4.3 was preceded by "where conditions permit, the bottom of the hydraulic station can be..."; 3.4.9 was added. The inner wall of the oil tank can be galvanized, but it shall not be painted". This standard replaces ZBJ50016-89 from the date of implementation. This standard was proposed by Guangzhou Machine Tool Research Institute and is under the jurisdiction of the department. The drafting unit of this standard: Guangzhou Machine Tool Research Institute. The main drafters of this standard: Liu Zhenfan, Zhu Junfeng, Luo Hui, Lao Guoliu 329
1 Scope
Mechanical Industry Standards of the People's Republic of China
Metal Cutting Machine Tools
General Technical Specifications for Hydraulic Systems
ydraulic system general specifications formelel--cutting machine toolsThis standard specifies the requirements, assembly and commissioning, safety and other aspects of the hydraulic system of metal cutting machine tools. This standard applies to the hydraulic transmission and control system of metal cutting machine tools with hydraulic oil as the working medium. 2 Referenced standards
JB/T 10051--1999
Replaces 2BJ580689
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 feasibility of using the latest versions of the following standards. G1B/T786.11993 Hydraulic and pneumatic graphic symbolsG13/T 7632 -- 1987
JB/T 7938 - 1995
J3/T 9871 .--1999
J3/T 9875.--1999
3 Requirements
3.1 Basic requirements
Selection of lubricants for machine tools
Oil tank capacity series of hydraulic pump station
Precision grade of metal cutting machine tools
Metal cutting machine tools
Preparation of random technical documents
3.1.1 The design, manufacture and use of the hydraulic system of metal cutting machine tools shall meet the following requirements: a) Personal safety;
h) Normal operation;
( ) Long service life of equipment;
( ) Maintenance 3.1.2 The performance of hydraulic components and parts used in the hydraulic system of machine tools must meet the relevant quality standards or various technical requirements of the design. 3.1.3 In order to ensure the normal operation of the hydraulic system of machine tools, oil that meets the requirements of GB/T7632 should be selected as the working medium. An oil filter must be installed at a location that is convenient for replacement and maintenance, and the oil should be carefully filtered before being injected into the hydraulic system tank (tank). The cleanliness of the oil used in the hydraulic system should meet the requirements of the relevant standards. 3.1.4 The oil used in the hydraulic system should be separated from the oil used in the guide rails or other mechanical parts. If it is difficult to separate, the following requirements should be met: a) It must be strictly filtered to remove impurities in the oil; h) All oils can meet various usage requirements at the same time. 3.2 Pipes, joints and channels
3.2.1 The pipe joints of the hydraulic system are made of metal, and the pipe materials are generally made of metal, oil-resistant rubber braided hose, synthetic resin high-pressure hose and other materials compatible with the medium. The pipe wall should be able to work normally when it withstands 1.5 times the maximum working pressure of the system. 3.2.2 All joints and exposed joints of the hydraulic system should not leak. Sealing fillers or sealing rubber are allowed to be used in joints and other joints, but it is forbidden to use hemp, silk and other sundries instead. JB/T10051--1999
3.2.3 The bend of the oil pipe should be smooth, without obvious dents and pressure deviation, and the short-long axis ratio should not be less than .75. 3.2.4 Before assembling the hydraulic system, the joints, pipes, channels (including casting core holes, machining, etc.) and oil tanks (tanks) should be cleaned. 3.3 Pipes
3.3.1 The channels used in the hydraulic system should have sufficient flow area. 3.3.2 The pipelines should be set up safely and reasonably, and the arrangement should be neat. It is convenient for adjusting, repairing and replacing components. In order to avoid vibration and impact of the pipelines, there should be a certain gap between the pipelines. When long pipelines vibrate or collide to make sounds, they should be fixed with pipes. The distance between each pipe can be based on the values in Table 1.
Outer diameter of the pipe
25-~ 50
3.3.3 The pipe clamp shall not be welded to the pipe 1, nor shall it damage the pipeline. Distance between pipe clamps 1Www.bzxZ.net
3.3.4 Pipes are generally not allowed to be used to support components or oil circuit boards. 3.3.5 Hoses are generally used between movable parts to facilitate the replacement of replacement parts, to suppress the transmission of mechanical vibration or noise, and to keep their length as short as possible to avoid serious bending and deformation of the hose during the operation of the equipment. If necessary, a hose protection device should be installed. 3.3.6 When the pipeline needs to be overhead, its height should be convenient for maintenance and to ensure the safety of personnel. The support should be firm. 3.3.7 Pipes should be marked and distinguished by different colors of paint: red for pressure pipelines; yellow for return and leakage pipelines; blue for control pipelines.
3.4 Hydraulic pump station and oil tank
3.4.1 The nominal capacity of the hydraulic pump station and oil tank shall comply with the provisions of JB/T7938. 3.4.2 During the entire working cycle, the liquid level must maintain a safe working height and have sufficient space for thermal expansion and separation of air. Under normal working conditions, it must be able to accommodate all the oil flowing back from the system, and must prevent the overflow or leakage of contaminated oil from directly returning to the tank.
3.4.3 If conditions permit, the bottom of the hydraulic station can be raised to more than 150mm from the installation surface to facilitate transportation, oil discharge and heat dissipation.
3.4.4 The removable cover plate should be able to prevent impurities from entering the oil tank in its structure. 3.4.5 Use a baffle or other measures to separate the oil from the inlet of the hydraulic pump. If a baffle is used, it should not hinder the cleaning of the oil tank. 3.4.6 The shape of the bottom of the oil tank must be able to drain the hydraulic oil. The oil tank should be equipped with one or more hand hole covers to clean the entire interior of the oil tank.
3.4.7 All pipes passing through the top cover of the oil tank should be effectively sealed, and the end of the return oil pipeline should be below the lowest liquid level in the oil tank. 3.4.8 A liquid level gauge should be installed near the filling point, and an air filter should be installed on the upper part of the vented oil tank. 3.4.9 The inside of the oil tank can be galvanized, but it must not be painted. 3.5 Low-pressure gauge
3.5.1 The pressure device set by the system should be installed in an obvious position that is easy to observe. 3.5.2 The range of the pressure gauge should be 1.5~~2.0 times the pressure to be detected, and the accuracy should not be lower than Class 2.5. 3.5.3 The pressure gauge should generally be equipped with a pressure relief device, or a shock-resistant pressure gauge, an additional damper, etc. 3.5.4 When measuring multiple pressures, a multi-point measuring device consisting of a pressure gauge and a selector valve can be used. 3.6 Overweight measures
All components, parts or equipment weighing more than 13kg must be able to be lifted or equipped with lifting devices. 531
3.7 Packaging
JB/T10051—1999
3.7.1 The exposed parts of the hydraulic system should be sealed with sealing caps, and the external threads must be protected. 3.7.2 Other requirements for packaging should comply with the provisions of relevant standards. 4 Assembly and commissioning
4.1 In order to facilitate assembly, commissioning and maintenance, the joints of the hydraulic system and the main engine separation parts should be numbered and marked, and the cylinder numbers and marks should be consistent with the relevant technical documents. 4.2 When installing the oil pump, care should be taken to ensure the coaxiality of the drive motor drive shaft. When rigidly connected, the coaxiality tolerance is 0.05mm; when flexibly connected, the coaxiality tolerance is 0.1mm. 4.3 Oil temperature and temperature rise
4.3.1 After the system is continuously operated at rated working pressure until the oil reaches thermal equilibrium, check the temperature and temperature rise of the oil. The temperature and temperature rise shall not exceed the specified values in Table 2.
Machine tool accuracy grade (according to IB/19871)
N, V grade
Grade III and above (including Grade III)
Note: The temperature at which the oil reaches thermal equilibrium refers to the temperature at which the temperature rise is no more than 2°C per hour.
4.3.2 When measuring temperature, the hygrometer should be as close to the oil suction port as possible. Therefore, the grade of the overflow meter shall not be lower than Grade 1.5, and the range shall not be greater than 100°C. 5 Safety
5.1 The action sequence between moving parts should have an interlocking safety device. When using a static pressure device, in order to ensure that the hydraulic system or other mechanical movements can only be driven when the static pressure is established, an interlocking safety device should also be provided. 5.2 When designing the hydraulic system of a machine tool, for a fully dynamic hydraulic machine tool or when the hydraulic system of the machine tool loses normal pressure and may produce unsafe factors, necessary alarm devices or indication signals should be set in the system. 5.3 When the connection between the oil pump and the drive motor is exposed, a safety anti-expansion device should be provided. 5.4 When the machine tool stops, the hydraulic circuit equipped with an accumulator must be able to automatically release the pressure in the accumulator, or the circuit can reliably isolate the accumulator.
5.5 When the machine tool stops, if the hydraulic circuit still needs to work with pressurized oil in the accumulator, safety instructions must be displayed on the accumulator or near the accumulator, including the instruction "Caution, pressure vessel". 6 Others
6.1 The hydraulic system description shall be included in the machine tool manual in accordance with the provisions of JB/T9875, and its contents shall generally include: a) The principle and use of the hydraulic system, including the hydraulic system schematic diagram, pipeline schematic diagram, and a detailed list of hydraulic component models and specifications. As well as the description of the special hydraulic component code and manufacturing information in the table, the pressure setting value of each hydraulic control valve, the required amount of oil to be introduced into the system to the highest liquid level, the specified oil type and viscosity range, the operating time table of the relevant electrical and mechanical control components, the identification mark of the full end of the pipeline, etc.
b) Precautions for the use of the hydraulic system:
c) Description of the maintenance, failure and analysis and elimination of the hydraulic system; d) The location of the test points, refueling ports, oil drains, sampling, oil filters, etc. that require regular testing and maintenance. 6.2 The graphic symbols used in the hydraulic system shall comply with the provisions of (B/T786.1. 532
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