The concrete pressure testing machine is a concrete mechanics testing instrument. The intelligent instrument can convert the pressure value and automatically convert the average value of each test block. It is used to test the compressive strength of concrete, brick, stone, cement, refractory brick and other building materials. Using hydraulic transmission, the pressure on the test piece is directly read on the display of the dynamometer, which is simple and fast. It has the characteristics of compact structure, easy operation and high accuracy of force measurement. It is a building, building material, highway, bridge, mine, university, etc.
★ a large test force: 2000kN
★ Rated pressure of hydraulic pump: 40MPa
★ Relative error of displayed value: ± 1%
★ Pressure plate size: 250 × 220mm
★ a large clear distance between pressure plates: 320mm
★ Large stroke of piston a: 50mm
★ Measuring range: 0-200kN
★ Measurement force resolution: 0.01kN
★ Dimensions: 890 × 370 × 1160mm
★ Net weight: 780kg
★数据存储：本压力试验机系统内存储的数据断电后仍然能够保留，恢复通电后能调取原存数据打印报告。★本系统a大存储量是3000个测试单元，当你保存第3001个数据时，前面1500个数据被清除，其余的数据依然有效。，第1501到3000个数据自动移至前面1500个数据处，第3001个数据保存在第1501个。在做第3001个数据试验前，应将前面的1500个数据进行保存。若使用通讯软件还可以与微机通讯，将压力试验机内数据存档备查或通过连网由管理**集中存储，以便质量监督微机化管理。本压力试验机系统数据表采用Microsoft Access软件，适用于远程的SQL server数据库进行数据的上传。
Third, the main function:
★ This pressure tester can realize automatic control of the test process. Automatically break the broken peak, print the test results, and terminate the test at any time during the test. It can save test data automatically, even when power is off. It can save a total of 3000 sets of data (a set of data can be a single block of data or 3 data), and can query and print the saved data. The test data is reliable and easy to operate.
★ Pressure display: Five-digit digital display pressure kN (thousand Newtons). The pressure is displayed in real time during the test, and the breaking peak value is displayed after the test.
★ Loading speed display: four-digit digital display loading rate kN / s (kN / s)
★ During loading, according to the rules of GB / T50081-2002, the range of loading rate that should be controlled for different test pieces is as follows:
A, Compression test block with a cross-sectional area of 100 × 100mm2
1, 3.0 ~ 5.0kN / s when the strength is less than C30
2. When the strength is ≥C30 and <C60, it is 5.0 ~ 8.0kN / s
3. 8.0 ~ 10.0kN / s for intensity ≥C60
B, Compression test block with a cross-sectional area of 150 × 150mm2:
1, when the intensity is less than C30, it is 6.75 ~ 11.25kN / s
2.Intensity ≥C30 and <C60 is 11.25 ~ 18.00kN / s
3, 18.00 ~ 22.50kN / s for intensity ≥C60
C, Compression test block with a cross-sectional area of 200 × 200mm2:
1, when the intensity is less than C30, it is 12.0 ~ 20.0kN / s
2, intensity ≥C30 and <C60 is 20.0 ~ 32.0kN / s
3.For intensity ≥C60, it is 32.0 ~ 40.0kN / s
★ Terminate the test: If you find that there is something wrong with the test during the test, you can press the "Stop" key to cancel the test and re-insert the test piece until the test piece breaks.
★ Print content: year, month, day, number, peak pressure, peak pressure (can be single block or 3 blocks), test criteria and results.
★ Data storage: The data stored in the pressure tester system can be retained after power failure, and the original data can be retrieved and printed after the power is restored. ★ This system has a large storage capacity of 3000 test units. When you save the 3001st data, the previous 1500 data is cleared, and the rest of the data is still valid. The 1501 to 3000 data are automatically moved to the previous 1500 data, and the 3001 data is stored in the 1501 data. Before doing the 3001th data test, the previous 1500 data should be saved. If the communication software is used, it can also communicate with the microcomputer, and archive the data in the pressure testing machine for future reference or centrally store the data through the management ** for the purpose of quality supervision and microcomputer management. This pressure tester system data table uses Microsoft Access software, which is suitable for remote SQL server database for data upload.
把随机电源插头插在相应插座上。电源为380V 50Hz 。
Fourth, installation and commissioning:
After unpacking the pressure testing machine, there is a lifting screw hole on the body with a nylon plug cover. Open the nylon plug, screw a random M20 lifting screw into the screw hole, and use the lifting machine to lift to the preset local. (When handling, pay attention to the protruding part of the machine.) For easy operation, the machine should be placed on a prefabricated 720mmx600mm cement base 300mm above the ground (see Figure 2). After the machine is leveled and installed, apply clean and kerosene-soaked cotton yarn, wipe off the rust inhibitor applied on the machined surface of the machine, then wipe the surface clean and apply a thin layer of mechanical oil.
★ Test machine debugging
This debugging content only includes preparations before operation. For other contents, please refer to the precautions section.
(1) Oil injection
Use a screwdriver to unscrew the fixing screws on the rear cover and remove the rear cover, and inject an appropriate amount of hydraulic oil into the φ40mm hole position on the fuel tank cover;
It is advisable to fill the oil in the middle of the oil mark;
Close the rear cover after filling.
When the ambient temperature is 15 ± 5 ℃, use GB443-84N68 mechanical oil
When the ambient temperature is 25 ± 5 ℃, use GB443-84N100 mechanical oil
(2) Electrical connection
Plug the supplied power plug into the corresponding socket. The power is 380V 50Hz.
(3) Start the oil pump exhaust
Open the oil return valve (15) and the oil supply valve (16). Rotate the power switch to turn on the machine (the red indicator light is on) to display the instrumentation screen, and then display the test screen after 2 seconds. Press the "Start" key to start the motor, the oil pump starts to work, and close the oil return valve after about one minute of continuous operation. At this time, you can find that the lower pressure plate rises slowly. When the lower pressure plate rises to about 20mm, close the oil supply valve and open the oil return Valve, at this time the lower platen is in a falling state. Repeat the above steps 3 ~ 4 times to completely eliminate the gas in the system.
10、试验结束，传感器应处于脱离载荷状态， 以保护传感器。 试验中执行打印时，若是打印纸用完，换上新的打印纸，按开关SEL键，再按LF键，打印机会自动进纸。
V. Precautions: The contents of this precaution include relevant contents in use, maintenance and inspection.
1. The power supply voltage must be accurate when used;
2. The cable connecting the sensor to the host must not have an intermediate connector. If it is damaged, the cable must be replaced and the wiring is accurate;
3. It must be operated in accordance with the procedures specified in the instruction manual.
4. It is strictly forbidden to lower the pressure plate (7) in excess of the specified stroke of the piston during operation.
5. After a long period of work, the sealing ring may fail and cause serious oil leakage in the cylinder. At this time, the following method should be used to replace the sealing ring.
a, remove the lower pressure plate and dust cover;
b. Remove the seal ring and ring on the inner wall of the cylinder after hanging out the piston with two M12 ring screws;
c. Replace with new sealing rings and rings, and put them into the piston carefully. Cover the pressure bearing plate. When not in use, always keep its appearance smooth and clean, and avoid bumps, scrapes and accumulation of impurities.
6. The shell of the pressure testing machine must be safely grounded. There are grounding screws on the back of the testing machine frame.
7. Calibration is performed by the metrology department, and users must not operate at will.
8. The pressure tester cannot share a power socket with a high-power electrical equipment.
9. The pressure tester should be placed in a clean place to prevent dust intrusion and used in a working environment where the temperature is 10 ~ 35 ° C and the humidity is ≤80%.
10. At the end of the test, the sensor should be out of load to protect the sensor. When printing is performed during the test, if the printing paper runs out, replace it with new printing paper, press the switch SEL key, and then press the LF key, the printer will automatically feed the paper.
11. Please do not disassemble the instrument without permission.
Six, the main structure:
★ Press machine body part
1. The frame 3 is a sturdy frame made of ductile cast iron. The upper part of the frame is equipped with a nut 4. The connecting screw 2 is provided with a convex ball seat 5 and an upper pressure plate 6 at the end of the screw. Adjust the contact between the upper pressure bearing plate and the compression surface of the test piece. According to the size of the test piece, the hand wheel 1 can be turned to adjust the screw rod to an appropriate height.
2. The positioning line is engraved on the surface of the lower pressure plate, which is convenient for the test piece to be placed in the ** position. The lower pressure bearing plate 7 is placed on the piston 8, and a dust cover is installed under the lower pressure plate to prevent debris and debris from falling into the oil cylinder 11. When the piston receives oil pressure rise, push the lower pressure plate to press the test piece upward.
3. The oil cylinder 11 is located in the lower part of the frame, and a composite sealing ring 9 is embedded in the upper part of the inner wall of the oil cylinder to prevent the oil from overflowing between the piston and the oil cylinder under high pressure, and the oil leakage is minimal. There is an oil pipe on the upper left side of the rear of the oil cylinder, which directly allows the oil spilled from the oil cylinder to flow back to the oil tank, so the surroundings of the machine can be kept clean.
4. In the case of concrete compression test, it is recommended that the user can make a diagonal bucket and tilt it to the rear to remove debris. In order to prevent the test piece from frequently moving and abrading the lower pressure plate, it is recommended to make a pad suitable for the size of the test piece. Plate, but requires heat treatment (hardness HRC55 or higher), after a long time abrasion, easy to replace.
★ Hydraulic control system
The pressure testing machine system includes an electric motor and a high-pressure oil pump, an oil delivery valve, an oil return valve, and a fuel tank. The oil pump and the motor 14 are connected by a coupling, and are seated on the oil tank 13, and the high-pressure oil directly enters the oil delivery valve 16. When the oil delivery valve is closed, the oil flows directly back to the oil tank. When the oil delivery valve is opened and the oil return valve 15 is closed, the high-pressure oil enters the oil cylinder and passes to the sensor. The sensor transmits a signal to the dynamometer 18.
★ Force measuring system
The pressure tester system is composed of a hydraulic sensor, a signal amplifier converter, data processing, a printer, a control operation panel, and a transmission loading mechanism.