Device Overview

1.1 Name and Model

Name: Digital Display Electric Lead Screw Testing Machine

Model: DYE-3000

1.2 Implementation Standards

Standard for Test Methods of Mechanical Properties of Ordinary Concrete

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

This machine features electrically driven hydraulic loading, force measurement via sensors, digital display of force values, printer output of force data, and automatic calculation of tensile strength. The loading speed must be manually controlled and is equipped with a loading rate indicator, peak hold function, and overload protection. It is an essential testing and inspection device for engineering institutions involved in construction, building materials, highway bridges, and related fields.

Technical Parameters

Structural Overview

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

3.1 Body Section

The testing machine frame is composed of four vertical columns that connect the cylinder body to the upper crossbeam. An electrically driven reduction gear is mounted on the upper crossbeam, allowing for electrically adjustable control of the test space height. A ball seat is installed at the lower end of the lead screw, which is connected to the upper pressure plate. The lower pressure plate rests directly on the piston of the hydraulic cylinder; when the specimen comes into contact with the upper pressure plate, the ball seat on the upper pressure plate automatically adjusts to maintain balance, ensuring that the specimen remains perfectly horizontal relative to the upper pressure plate. The lower pressure plate is engraved with positioning lines for the specimen—during testing, the specimen must be aligned precisely with these lines. A dust‑proof housing is installed beneath the lower pressure plate to prevent or minimize dust from entering the cylinder during piston movement, thereby protecting the cylinder body and oil seals from damage. A sealing device is installed between the piston and the cylinder to prevent oil leakage; however, if a small amount of oil does leak during operation, an annular oil groove is provided at the top of the cylinder body, along with an oil drain passage that directs the leaked oil back to the main oil tank.

3.2 Hydraulic Control Section

The control box of this testing machine mainly consists of an oil tank, oil pump, oil filter, motor, speed valve, return oil valve, and other components. The oil pump is a direct-drive axial five‑column pump. When the testing machine is under load, the loading speed valve should be manually controlled to…

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The piston’s rising speed is precisely controlled (this speed is integrated with the safety valve). When unloading, simply turn the return oil valve, and the cylinder will slowly descend. The safety valve is pre‑adjusted to the appropriate setting at the factory; under normal operating conditions, users must not adjust the safety valve.

Installation of the Testing Machine

4.1 When hoisting the testing machine, thread the lifting wire through the lifting ring screw at the top of the lead screw.

4.2 The testing machine shall be installed on a sturdy foundation approximately 20 cm above the ground, with two M16 anchor bolts pre‑embedded.

4.3 When installing the testing machine, use a 1/1000 frame level to measure the plane of the lower pressure plate and ensure that the lower pressure plate is perfectly horizontal. If it is not level, adjust it using shims (place shims under the nuts at the bottom of the upright columns).