I. 300-ton/3000KN Automatic Pressure Testing Machine Main Purpose

This testing machine is used to determine the compressive strength of building materials such as bricks, stones, and concrete.

The machine employs electric hydraulic loading, sensor force measurement, digital force value display, and a printer to output force value data, which is then converted into compressive strength. This testing machine complies with the standard "Standard for Test Method of Mechanical Properties of Ordinary Concrete." It requires manual control of the loading speed and is equipped with a loading speed indicator, peak hold, and overload protection functions. It is an essential testing and inspection device for construction, building materials, highway bridges, and other engineering units.

II. 300-ton/3000KN Automatic Pressure Testing Machine Main Technical Parameters

1. Load: 3000KN

2. Indication Accuracy: Grade 1

3. Resolution: 0.1KN

4. Distance Between Compression Plates: 350mm

5. Upper and Lower Pressure Plate Specifications: 300×250mm

6. Piston Diameter * Maximum Stroke: Diameter 290×80mm

7. Motor Power: 0.75KW

8. Input Voltage: 380V

9. Overall Dimensions: 880×480×1400mm

10. Net Weight: 950kg

III. Structural Overview

The testing machine mainly consists of three parts: the body, the hydraulic control box, and the force measuring instrument.

1. Body Section

The body of the testing machine is connected by four columns linking the cylinder body and the upper beam.

On the upper beam of the testing machine, an adjustment screw, a large handwheel, and a nut screw are installed to adjust the no-load height of the testing machine. The lower end of the screw is equipped with a ball seat and an upper pressure plate. The lower pressure plate is placed on the piston of the oil cylinder. When the specimen contacts the upper pressure plate, the ball seat of the upper pressure plate can self-adjust for balance, ensuring the specimen remains level with the upper and lower pressure plates. The lower pressure plate is engraved with positioning lines for the specimen. During testing, the specimen must align with these lines. Below the lower pressure plate, a dust cover is installed to prevent or reduce dust from entering the oil cylinder during piston movement, which could damage the cylinder body or oil seal. A sealing device is installed between the piston and the oil cylinder to prevent oil leakage. However, if a minimal amount of oil leaks during use, an annular oil groove at the top of the cylinder body and an oil discharge channel will direct the oil back to the main tank.

2. Hydraulic Section

The hydraulic box of this testing machine mainly consists of an oil tank, oil pump, oil filter, motor, speed valve, and return oil valve. The oil pump is a direct-rotation axial five-pillar pump. During loading, the loading speed valve should be manually controlled to regulate the piston’s rising speed (this valve is integrated with the safety valve). During unloading, the return oil valve can be turned to allow the oil cylinder to descend slowly. The safety valve has been pre-set to an appropriate position before leaving the factory. Under normal use, users should not adjust the safety valve.