Equipment Overview

1.1 Name and Model

Name: Digital Universal Material Testing Machine

Model: WE-1000B

1.2 Function Overview: This series of testing machines is mainly used for tensile, compressive, bending and other tests of metal materials, and is equipped with cold bending accessories, which also serve as cold bending tests for metal materials. Therefore, this testing machine meets the testing needs of scientific research institutions, construction units, metallurgy, machinery manufacturing, and various school laboratories.
The working oil cylinder of this series of testing machines adopts a downward type, oil pressure loading, sensor force measurement, and digital display of force value. It has a loading speed indicator window that can be adjusted at any time. Easy to operate, stable performance, safe and reliable. This series of testing machines consists of two independent parts: the main unit and the load cell.

Technical Specifications

Machine systems and working principles

This machine is divided into two parts: the main unit and the load cell, which are connected through oil pipes.

3.1 Host

The host is composed of two parts: a height adjustable support frame (consisting of a machine base screw and a moving crossbeam) and a working frame (consisting of a working oil cylinder, piston, worktable, light bar, and upper crossbeam).
Its working principle is that the high-pressure oil pump supplies oil to the working cylinder, and through the movement of the piston, the worktable and upper crossbeam are pushed upward to perform tensile or compression tests on the sample. The tensile test is conducted between the upper crossbeam and the moving crossbeam of the host, while the compression test is conducted between the worktable of the host and the moving crossbeam. The adjustment of the experimental space is mainly achieved by driving the mechanism to move the crossbeam up and down.

3.2 Working oil cylinder and piston

The working oil cylinder and piston are the main parts of the main engine. The oil cylinder is fixed on the machine base, and a ball head is set between the piston and the worktable. The return stroke is to press the piston back by its own weight. The sealing of the pressure oil is carried out by the oil film between the oil cylinder and the piston, and guided by the inner surface of the oil cylinder. Due to the centering effect of the ball head, the frictional force between the oil cylinder and the piston caused by lateral force is reduced.

3.3 Moving crossbeam and driving mechanism

The moving crossbeam is supported on a screw through a transmission nut, and the screw can rotate in both forward and reverse directions. The screw rotates by a drive mechanism installed at the bottom. The mobile mechanism consists of a reduction motor, sprocket, and chain. The reduction motor drives two lead screws to rotate synchronously through the sprocket and chain.

3.4 Piston stroke limit device

(1) Workbench (2) Limit pull plate (3) Limit switch (4) Touch the pole (5) Oil cylinder, piston (6) Base

A limit switch 3 is installed between workbench 1 and base 6. When the piston rises, it drives the limit pull plate 2 to rise together. If the contact rod 4 comes into contact with the outer spring rod of the limit head, the oil pump power supply will be disconnected to achieve safety protection function.

3.5 Deceleration mechanism

1. Lead screw 2. Large chain wheel 3. Adjust the intermediate wheel 4. Oil cylinder, piston 5. Chain 6. Active chain wheel

3.5.1 A reduction mechanism is installed on the machine base, where 6 is the driving sprocket that drives the chain to move, 1 is the symmetrical lead screw, 2 is the large sprocket mounted on the lead screw, 3 is the tension adjusting intermediate wheel, 4 is the piston oil cylinder, and 5 is the chain.
3.5.2 The installation and adjustment of the chain have already been adjusted before leaving the factory, and users do not need to adjust it again.
3.5.3 Special attention should be paid when moving the moving crossbeam, and it is important to note that the moving crossbeam should not be used for force application. The moving crossbeam only serves the purpose of lifting and lowering when unloaded.

3.6 Dynamometer

This testing machine adopts a digital force indicator. The force measurement part consists of a digital display, pressure sensor, microcomputer, and printer. For specific usage instructions, please refer to the user manual of the force measurement display controller.

3.7 Hydraulic Control System

The hydraulic control system consists of the high-pressure oil pump of the dynamometer, the oil delivery valve, the return valve, and the working piston of the main engine's working oil cylinder. During the experiment, the oil enters the oil delivery valve through the outlet pipe of the oil pump. When the handwheel of the oil delivery valve is closed, due to the action of oil pressure, when the handwheel of the oil delivery valve is opened, the oil is throttled by the oil delivery valve and enters the working cylinder through the oil delivery pipe. Under the action of pressure, the working piston moves upward to drive the main machine worktable, the crossbeam on the light bar, etc. to load the sample. At the same time, the pressure oil enters the return valve through the return pipe and then enters the pressure sensor. After calculation and processing by the microcomputer, the results are displayed or printed in digital form.

Precautions

1. Please lift the host according to the schematic diagram in the attached figure. 2.When conducting a tensile test, please remove the cold bending device before conducting the test to avoid accidents. 3.During the experiment, it is strictly prohibited to start the crossbeam for loading and unloading! The purpose of moving the crossbeam is to adjust the testing space. If operated incorrectly, it can cause chain breakage in the drive mechanism, jamming of the moving crossbeam, and other malfunctions. 4. After using the testing machine for a period of time, the tightness of the chain during the transmission process should be checked. If the chain is found to be too loose, please use the screws behind the sprocket frame to tighten the chain.