Testing machine type: Digital ultra-low temperature fully automatic impact testing machine
Specification and model: JBDS-D series
Impact energy: 300J/500J
1、 Performance Description:
The JBDS-D series low-temperature impact testing machine is used to test the impact resistance performance of metal materials under dynamic loads. It is an essential testing instrument for metallurgical machinery manufacturing and other units, as well as an indispensable testing instrument for research institutions conducting new material research.
1. This impact testing machine uses liquid nitrogen refrigeration, with a minimum temperature of -190 ℃ (-190 ℃~-196 ℃ is a special requirement), making it particularly suitable for measuring the impact resistance of metal materials at extremely low temperatures. It is an important testing method for metallurgical, mechanical manufacturing, scientific research and testing units to test materials and research and develop new materials.
2. The main body of the testing machine is a split structure, with a cantilever hanging pendulum method and a C-type pendulum body.
3. The impact knife is fixed with screws for easy replacement.
4. Sample simply supported beam, sample end face positioning.
5. The host is equipped with a safety net.
6. The testing machine conducts impact tests on metal materials according to the national standards GB/T3808-2002 "Pendulum Impact Testing Machine" and GB/T229-2007 "Charpy Pendulum Impact Test Method for Metal Materials".
2、 Host structure and working principle:
1. The low-temperature impact testing machine consists of a main unit, a low-temperature device, a feeding mechanism, and an automatic positioning mechanism.
2. Low temperature device: This low-temperature device is the latest compressor refrigeration equipment developed by our company according to the requirements of GB/T229-2007 "Charpy Pendulum Impact Test Method for Metal Materials" for low-temperature devices. By using the cascade compressor refrigeration technology, utilizing the principle of thermal balance and circulating stirring method, automatic uniform cooling and constant temperature of the sample can be achieved, which can fully meet the various temperature control indicators specified by national standards. The low-temperature tank is controlled by single-chip microcomputer technology, with digital temperature values, automatic temperature control, automatic timing, and automatic alarm. It is easy to operate and safe, with fast cooling speed, large volume, and high temperature control accuracy. It is an ideal sample cooling and insulation equipment for low-temperature impact testing of metal materials.
3. Feeding mechanism: After the sample is cooled to the set temperature in the low-temperature device, the feeding mechanism can quickly and reliably deliver the sample to the jaw support surface. The feeding mechanism mainly consists of two parts: feeding device and damping device. The movement of the feeding mechanism is transmitted by the motor through large and small pulleys, friction plates, and gear shafts to the rack and feeding rod, which converts the forward and reverse rotation of the motor into a linear motion of the feeding rod for rapid forward feeding and backward reset. The feeding gear is equipped with shift forks in front and behind. When the rack moves, the shift fork collides with the piston rod of the damping oil cylinder, which uses the damping effect of the oil cylinder to resist the forward movement of the rack and the rotation of the gear. With the friction of the friction wheel, the feeding speed is reduced, ensuring that the sample is reliably fed into the clamp surface and the feeding rod returns to its original position correctly. Friction plates slip, which can protect components from damage. By adjusting the position of the nut before and after, the spring pressure changes, causing the magnitude of the friction force to change. This can change the thrust of the feeding rod, adjust the throttle valve in the damping cylinder, change the oil discharge amount, and change the damping force, thereby changing the speed of feeding to the front and rear ends. The damping cylinder uses No. 46 hydraulic oil (or other oil with the same viscosity), and the amount of oil added should not be too small. The forward, reverse, and stop of the feeding rod are achieved by the blocking piece of the feeding rod blocking the proximity switch to send electrical signals and control the direction of the motor. Adjusting the position of the switch cover can fine tune the position and stroke length of the feeding rod.
4. Positioning mechanism: The specimen must be tightly attached to the side of the jaw, so that the notch of the specimen is correctly located at the center of the pendulum axis. The sample is tightly attached to the side of the jaw, which is ensured by a positioning mechanism. When the sample is sent from the feeding rod to the front support, due to the action of the fixed spring plate, the sample moves forward tightly against the side of the clamp. When the rear end of the sample has not yet detached from the fixed spring plate and the front end enters the rear clamp surface, the blocking piece in the feeding mechanism blocks the proximity switch and sends a signal. The electric magnet moves, and then the positioning mechanism moves. The positioning rod of the positioning mechanism reaches the working position, and the elastic top column on the side of the positioning mechanism presses the sample tightly until the front end of the sample is tightly against the positioning surface of the positioning mechanism, completing the positioning work of the sample. When the feeding rod spring is compressed, the electromagnet resets after receiving a signal, and the positioning mechanism moves away from the sample positioning surface for impact. The positioning mechanism is integrated with the bracket, and the pulling of the electromagnet and the resetting of the spring drive the positioning block to move up and down, pushing the positioning screw under the action of the spring. The positioning screw always adheres to the positioning surface, and at the same time, through the pin on the movable sleeve, the positioning mechanism drives the elastic top column on the side to rotate. Eccentric blocks can reduce the inertial impact of the positioning mechanism on the specimen, thus improving the accuracy of specimen positioning.

3、 Main technical indicators:

Note: The parameters of the Zhongbiao impact testing machine are for reference only. Any changes will not be notified separately, and the actual product of the company shall prevail.