Cement pole pressure testing machine

1Cement pole pressure testing machineProduct Introduction

In order to determine the compressive strength of cement poles, the yes and ye models are widely usedCement pole pressure testing machineIn the physical inspection of cement, the hard training method was used in the past, and the laboratory of cement electric pole factories generally used a 2000KN press. Now, the soft training method is implemented, and more 2000KN hydraulic presses are used. This machine uses pressure loading, so the transmission is stable and reliable. The force measurement adopts a dynamic pendulum force gauge with high accuracy and an indication error of<1%, which complies with national standards such as GB/T50081-2002 and GB/T17671-1999.

IITechnical parameters:

1. * Large test force (kN): 2000kN

2. Test force measurement range: 4%~100% FS

3. Measurement error of experimental force: ± 1%

4. Control method: force closed-loop control

5. Speed control range: 1~30kN/s

6. Dimensions of upper and lower pressure plates: 370 × 370mm

7. Upper and lower pressure plates * large distance: 320mm

8. Piston stroke: 50mm

9. Power supply: 0.75kW

10. Host size: 520mm × 440mm × 1360mm

11. Weight: Approximately 750kg

IIIWorking Principle:

The oil cylinder of the pressure material testing machine is located in a sealed container. When the liquid is subjected to pressure at any point, the pressure is transmitted to any part of the container, and the strength of the pressure remains unchanged. The hydraulic pressure machine is designed based on this principle. The hydraulic pressure machine is composed of an oil pump, an oil cylinder, and a force measuring mechanism, which are connected by pipelines to form a closed hydraulic system.

4、 Correct usage method of testing machine:

Select a certain range based on the pressure of the specimen, adjust the buffer valve (located at the upper left corner of the oil tank) in the same way as the universal machine. Select the length of the pressure head of the upper pressure plate according to the size of the specimen (replace the anti bending device when conducting concrete anti bending test), place the specimen, close the return valve, open the oil delivery valve, and start the test. After the specimen is damaged, close the oil delivery valve, open the return valve, remove the specimen, and place a cushion block on the small specimen when pressing it.

5、 Hydraulic system principle:

Manual loading

Cut off the power supply of the automatic loading control device, open the force cut-off valve (21), and the press will be in manual mode. At this time, the electro-hydraulic proportional valve and the two position four-way valve are in a power-off closed state. The oil in the fuel tank (1) is sucked into the oil pump (4) through the oil filter (20), and then sent to the oil delivery valve (7) through the oil pump outlet pipe (5). When the oil delivery valve is opened, pressure oil is sent into the working cylinder (8), which can lift the piston in the plunger type cylinder. The inner cavity of the cylinder is connected to the return valve (10) through the oil pipe (9), and the pressure oil in the cylinder flows unidirectionally to the force measuring cylinder (11), thereby driving the force measuring mechanism (15) such as the pull plate and swing rod shaft to indicate the value. When the load on the working cylinder suddenly disappears, open the return valve switch. At this time, the working cylinder is unloaded, and the pressure oil of the force measuring cylinder must flow through a throttle valve with damping effect to achieve the purpose of slow return oil. A small amount of oil overflow that may occur in various parts of the hydraulic system may drip into the oil pool of the base for temporary storage and can be regularly discharged from the oil drain hole on the back.

6、 Pressure material testing machine:

1. Connect the power and turn on the power switch (located behind the control box). Turn on the power supply of the automatic control device, close the oil supply valve, oil return valve, and force measuring cut-off valve of the testing machine, which will be in automatic mode. The proportional valve controlled by the computer will regulate the flow rate of pressure oil entering the oil cylinder, thereby achieving the purpose of speed regulation.

2. Select the appropriate gear.

3. Press the "Menu" button to set up the system, and press the "Confirm" button to save the settings. If there is no need to adjust the system default settings as shown in Figure 3, proceed to the next step directly.

4. Press the 'reset' button to reset.

5. Place the test piece in the center.

6. Press the up or down button of the screw to make the upper pressure plate about 5mm away from the specimen. It is strictly prohibited for the upper pressure plate to come into contact with the specimen.

7. Press the 'Start' button to start the motor. The red signal light is on. If it is not on, the speed will not be displayed, and the test data cannot be saved or printed.

8. Close the oil return valve, slowly open the oil delivery valve, and control the loading of the oil delivery valve at the required rate until the specimen ruptures, and the displayed value is the peak value. At the same time, the LCD screen can draw the curve of the specimen from loading to rupture.

9. Open the return valve and close the delivery valve.

10. Remove the fragments of the test piece.

11. Insert the second specimen, then press the "Start" button and repeat steps 8-10.

12. Place the third specimen and press the "Start" button again, repeat steps 8-10.

13. Open the return valve to unload.

14. Press the "Confirm" button to enter the data screen, which can display the data (peak value) of the experiment.

15. Press the 'Print' button to print out all the detection data content within this number. (Press the "back" button directly to exit without printing.)

16. Press the "Return" button to return to the test screen and proceed to the next set of experiments.

17. At the end of the experiment, press the "stop" button in the testing state to stop the motor.

18. Turn off the power.

Attention: When the piston exceeds the maximum stroke (about 100mm), the proximity switch provides protection and the press stops working. At this time, the return valve handle should be opened to lower the piston a certain distance, and then the test should be repeated.