Hydraulic universal material testing machine maintenance

Hydraulic universal material testing machine maintenance

Installation and maintenance of hydraulic universal material testing machine
1 Preparation before installation (1) The hydraulic universal material testing machine should be installed in a room that is clean, dry, vibration-free and can be controlled at room temperature (10 ~ 35) °C. And the room should have enough space to ensure that there is more than 70cm space around the test machine for testing and routine maintenance.

(2) Digging a pit of the hydraulic universal material testing machine to a pit, the size of the base of the hydraulic universal material testing machine is greater than 50cm, and the depth is not less than 30cm.

(3) Watering the concrete with a strength grade not less than C20 in the pit, leaving holes for anchoring anchor screws and piping for installing circuits and sensors when pouring concrete. The level of application of the concrete foundation is leveled.

(4) The hydraulic universal material testing machine is connected to the three-phase four-wire power supply, and the power supply should be equipped with air switch and leakage protection device. The wire should be greater than 150 cm from the ground. A manual electric switch should be installed on the wire to control the power of the test machine.
2 Preliminary calibration of the installation accuracy of the test machine The main body of the hydraulic universal material testing machine should use the frame level or borrow the wire hammer in the accessory to correct the verticality of the column in two directions perpendicular to each other, and adjust the method by inserting a small piece of iron at the bottom of the main body. . Install the anchor screws and use a spring washer. Use high-strength cement mortar to pour the screw holes of each foot, fill the gap between the test machine and the ground, sprinkle water for more than one week, and then tighten the screws.
3 Hydraulic system connection (1) Remove the bundled parts and clean the inside of the oil pipe with clean kerosene, especially the connecting thread of each oil pipe.

(2) Check if the gasket at the joint is complete. If it is damaged due to transportation, it should be installed with the new gasket attached to the test machine to prevent oil leakage during high pressure.

(3) Connect the tubing with a suitable wrench. If it is a seamless copper tube, it should be connected to the main unit, and rely on the movement of the console to adjust the spacing to connect the console end.

(4) Discharge the residual oil in the fuel tank and remove the residue in the fuel tank.

(5) Uncover the iron gate of the hydraulic control box, you can see the screen oil filter, which is injected into the fuel tank through the oil filter when filling. The test machine usually uses hydraulic oil. In the summer, the hydraulic oil with higher viscosity should be used. In winter, the hydraulic oil with less viscosity should be used.

(6) Be sure to pay close attention to the oil level when refueling. If the amount of oil is too small, the test machine will not work properly. Too much oil will cause hydraulic oil to leak from the working cylinder port.
4 Electrical installation The hydraulic universal material testing machine supply voltage is the electrical connection between the three-phase 380V main body and the hydraulic control box. Before powering on, open the iron door of the hydraulic control box, check whether the wiring is disconnected, whether the fuse is loose, and clean the dust and debris in the electrical box. After confirming that the device has been connected to the power supply line, press the “Power” button on the panel of the hydraulic control box. The indicator light indicates that the information has been retrieved and the power supply is turned on. Open the oil pump, check whether the running direction of the oil pump and the direction indicated by the arrow are the same. If it is the opposite, change any two connected positions, then click the clamp seat lifting button, remove the wooden block on the platen, and unscrew the oil supply valve to rise. Piston, check the piston stroke limit switch for operation with reference to the scale on the main column.
5 Hydraulic universal material testing machine debugging (1) Turn off the oil pump motor, unscrew the MS plug on the oil pump, drain the air in the pump (flow out with a small amount of oil), and then vent the air and then return the plug: start the oil pump repeatedly lift the piston Drain the air in the cylinder and tubing.

(2) Pull the cold-bending support to the two sides equidistantly, in order to move the beam without lifting it:

(3) Install the spherical lower pressing plate on the platen, and lift the moving beam so that the upper and lower pressing plates are separated by about 20 mm:

(4) Start the oil pump, close the oil return valve and open the oil supply valve to raise the platen and slowly increase the pressure:

(5) Check the oil pipe joints for oil leakage:

(6) If there is oil leakage, tighten the oil joint and material after unloading.

Main technical parameters of hydraulic universal material testing machine:

1, model specifications : XJWE-300

2. Measurement range : 0-300KN
3, the indication accuracy : ± 1%
4, relative resolution : ≤ 1%
5, compression space : 550mm
6, stretching space : 550mm
7, round sample clamping diameter : Φ6-30mm
8, flat sample clamping diameter : 0-15mm
9, piston stroke : 150mm
10, the maximum distance of the bending fulcrum : 400mm
11. Deformation indication accuracy %: Within ±0.5% of the indicated value
12. Relative error of displacement indication: within ± 0.5% of the indicated value
13. Stress rate range: 1N/mm2S-1-60N/mm2S-1
14. Strain rate range: 0.0025/S-0.00025/S
15, constant test force; constant deformation; constant displacement rate control; control accuracy: ± 1% set value
16, the host dimensions (mm): about 760 * 460 * 1965
17, motor power : 3.25KW, 3 phase
18, weight : about 1300kg
Features of hydraulic universal material testing machine: 1. Suitable for tensile, compression, bending, shearing and other tests of materials and components. It can also be used for testing similar tests of non-metallic materials such as plastics, concrete and cement. Test parameters such as maximum test force, tensile strength, elongation, and yield strength can be obtained.
It can realize computer control. This machine adopts hydraulic jaws under the cylinder, and the test space can be adjusted. The application of micro-electro-hydraulic proportional full digital closed-loop control system, the loading speed can be set freely. The measurement adopts imported high-precision sensor, which can realize the result force value under constant stress; displacement; deformation; computer tracking test data and curve dynamic display. Test data editing; curve browsing; storage; and can print out the complete required test report and curve

Hydraulic universal material testing machine configuration

1. The machine contains:

Base, cylinder, piston, lifting motor, lifting system, lead screw, test bench, vertical bar, upper and lower beams,
2, three sets of standard fixtures (pull (can clamp round flat sample), pressure, bend each set);   
3. One high-precision proportional valve;
4, high precision tillage fine displacement; each of the force sensors
5. A set of high-precision electro-hydraulic measurement and control system for microcomputer;
6, WINDOWS2000/XP Chinese version of the metal stretching, compression, bending, shear test software. (Free upgrade) can meet the technical parameters of GB/T228-2002, GB/T5224-1995, GB/T232-1999 and other national standards)