JB/T 6105-2007Hydraulic power units for NC machine tools - Technical requirements (English PDF)

3.5 General Requirements for Design, Installation and Application of Each Component in Pump Station

3.5.4 Oil filter component

3.5.4.1 For the oil filter on the intake pipe of the hydraulic pump, the oil passing capacity shall be larger than twice of pump capacity. For the fine filter on the pipeline, the filtering fineness must ensure the cleanliness level requirements of the fluid, and the installation of the fine filter shall be convenient for dismantling.

3.5.4.2 The filter element of the oil filter shall be periodically replaced, and the pollution indication or alarm device shall be equipped.

3.5.5 Accumulator component

3.5.5.1 The parameters such as oil suction, drain flow, and pressure of accumulator shall be in accordance with the system application requirements.

3.5.5.2 The one-way valve shall be installed between the accumulator and hydraulic pump to prevent back flow of the pressure oil in the accumulator during pump shut down.

3.5.5.3 The stop valve shall be installed between the accumulator and system, which is used for gas filling, inspection and maintenance of the accumulator or long term shutdown.

3.5.5.4 The accumulator in the oil filling state shall not be dismantled.

3.5.6 Pipe fittings

3.5.6.1 The oil suction port of the pump shall keep the distance as far as possible from oil return port and oil drain port of the system; all pipes shall be inserted below the lowest oil level.

3.5.6.2 The distance H from the oil suction pipe and the tank bottom shall be larger than 2D (D is the pipe diameter); the distance from the tank wall shall be larger than 3D; the distance H from the oil return pipe and oil drain pipe shall be larger than 3D, and the pipe orifice shall face the tank wall.

3.5.6.3 When the oil return tank of the same pipe is adopted for oil drain pipe, guiding control oil return pipe and main oil return pipe, then the reliable and interference protection method shall be provided. If not, the pipe oil return tank shall be equipped separately. d) Noise test.

5.2 Type Test

5.2.1 The type test shall be carried out under any of the following conditions.

a) The trial manufacture and typing identification when new products or old products are transferred to another plant;

b) The inspection shall be carried out periodically when mass production;

c) Where the production is resumed after a long-time shutdown.

5.2.2 All type test items shall be carried out according to those specified in Table 2.

5.2.3 The samples of type inspection shall be randomly sampled from the inventory products; the quantity shall not be less than three sets. If one item is unqualified in the inspection, the double-quantity re-inspection may be carried out for this item; if it is still unqualified, this product shall be judged as unqualified.

6.1 Mark

The front of each pump station must be provided with corrosion-proof and difficult-to-shed nameplate mark; the following contents shall be clearly marked on the nameplate.

a) Manufacturer name;

b) Product model and name;

c) Main technical parameters. tank capacity, rated pressure and rated discharge;

d) Factory number and manufacture date.

6.2 Package

6.2.1 All inlet and outlet oil ports of the pump station shall be sealed and protected; the identification mark must be made on the dismantled pipeline and the corresponding end hole or joint.

6.2.2 The package shall be in accordance with those specified in JB/T 8356.1.

6.2.3 The accompanied documents of the package are.

a) Product qualification certificate;

b) Product instruction;

c) Packing list;

d) Other relevant technical documents.

6.2.4 The mark of the packing box shall be in accordance with those specified in GB/T 191. […]