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NKJBDW-300F Fully-Automatic Low-Temperature Metal Pendulum Impact Testing Machine

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Charpy Pendulum Impact Testing Machine

NKJBDW-300F Fully-Automatic Low-Temperature Metal Pendulum Impact Testing Machine

Product Introduction

I. Introduction

The NKJBDW-300F Fully-Automatic Low-Temperature Feeding Impact Testing Machine is a newly developed 2025 model by our company, with multiple patented technologies. The machine effectively solves common issues in similar products on the market such as sample freezing and jamming, while offering simple operation and easy maintenance.

The machine uses a three-phase four-wire 50Hz, 380V power supply. Please ensure correct connection and grounding to guarantee both the safe operation of the machine and operator safety.

When starting the machine and clicking the “Lift Pendulum” button, the pendulum should rotate counterclockwise when facing the front of the machine. If the direction is incorrect, immediately cut off the power supply and reverse the phase sequence to ensure proper operation.

As product improvement and optimization are ongoing, some parts of this manual may not fully reflect future updates. We appreciate your understanding. Please feel free to contact us anytime during use—we are always committed to providing you with our best service.

II. Application and Features

The Computer-Controlled Fully-Automatic Low-Temperature Feeding Pendulum Impact Testing Machine is used to determine the impact resistance of metallic materials under low-temperature dynamic loading conditions, thereby evaluating the toughness and impact performance of materials under dynamic stress.

This model is equipped with two pendulums:

· Large pendulum: Maximum impact energy 300 J

· Small pendulum: Maximum impact energy 150 J

· Applicable specimen dimensions: 10 × 10 × 55 mm

This machine integrates low-temperature conditioning, automatic sample feeding, and impact testing into one unit. All processes—including sample cooling, temperature holding, temperature adjustment, pendulum lifting and release, sample feeding, positioning, and impact—are electrically controlled and automatically completed, resulting in simple operation and high efficiency.

After each specimen is fractured, the residual energy automatically lifts the pendulum, preparing for the next test cycle.

The main frame of the impact tester is made of QT500 cast iron, ensuring excellent rigidity, impact resistance, minimal deformation, accurate results, and long service life.

The pendulum lifting system adopts an electromagnetic clutch and power motor, providing smooth and vibration-free operation.

The refrigeration system uses an imported EMBRACO compressor, applying the heat balance principle to ensure uniform, stable, and adjustable specimen temperature.


III. Applicable Standards

This testing machine complies with the following standards:

ISO 148-1:2016 Metallic Materials — Charpy Pendulum Impact Test — Part 1: Test Method

EN 10045-1:1990 Metallic Materials — Charpy Impact Test (V-notch) — Part 1: Test Method

ASTM E23-18 Standard Test Methods for Notched Bar Impact Testing of Metallic Materials

JB/T 6865-1993 Technical Requirements for Pendulum-Type High and Low Temperature Impact Testing Machines

GB/T 18658-2018 Verification of Pendulum Impact Testing Machines Using Charpy V-Notch Reference Test Pieces

GB/T 3808-2018 Verification of Pendulum Impact Testing Machines

GB/T 229-2020 Metallic Materials – Charpy Pendulum Impact Test Method

JJG 145-2007 Verification Regulation of Pendulum Impact Testing Machines


IV. Working Principle

The testing principle is based on the difference between the potential energy of the pendulum before and after impact, which is displayed on the dial to calculate the absorbed energy of the specimen.

The operation can be performed through computer control (or manual control). The energy difference is displayed directly on the computer screen (or on the main dial), with higher accuracy and readability compared to traditional pointer dials.

Since the residual energy automatically lifts the pendulum after each impact, the machine is especially suitable for laboratories performing continuous impact tests and industrial plants such as metallurgy and mechanical manufacturing where large quantities of tests are conducted.


Product Introduction
Main Technical Parameters

Main Technical Specifications

No.

Item

Specification

1

Impact energy

300 J, 150 J

2

Dial range and division value



Energy range

0–300 J / 0–150 J


Dial graduation

0.5 J / 0.25 J


Computer display resolution

0.01 J

3

Pendulum moment



Energy range

0–300 J / 0–150 J


Pendulum moment

160.7695 N·m / 80.3848 N·m

4

Initial pendulum angle

150°

5

Distance between pendulum axis and specimen center

750 mm

6

Impact velocity

5.2 m/s

7

Span of anvil supports

40 mm

8

Fillet radius of anvil supports

R1–1.5 mm

9

Inclination of anvil support surface

11° ±1°

10

Radius of impact knife edge

R2–2.5 mm

11

Included angle of impact knife

30°

12

Thickness of impact knife

16 mm

13

Specimen dimensions

10 × 10 × 55 mm

14

Temperature range

Room temperature ~ –196 °C

15

Feeding speed

≤ 2 s

16

Temperature gradient

1 °C

17

Temperature fluctuation

±0.5 °C

18

Sample capacity

20 specimens

19

Overall dimensions (L×W×H)

Approx. 2000 × 1700 × 1900 mm

20

Machine weight

Approx. 880 kg

21

Motor power

250 W

22

Pneumatic pressure adjustment range

0.6–0.7 MPa

23

Power supply

Three-phase four-wire 50 Hz 380 V ± 10%; 220 V 50 Hz



Machine Configuration


Serial No.

Configuration Name

Quantity

Detailed Description

Optional Recommendation

1

Main Machine

1 set

Cantilever Beam Structure / Simply Supported Beam Support

Standard

2

Feeding System

1 set

Pneumatic Feeding

Standard

3

Liquid Nitrogen Tank

1 set

Capacity 35L

Standard

4

Refrigeration Chamber

1 set

Full Stainless-Steel Shell

Standard

5

Operating Console

1 set

Piano-Style Structure

Standard

6

Positioning and Clamping System

1 set

Mechanically Automatic Clamping

Standard

7

Computer Host

1 set

Lenovo Industrial PC

Standard

8

Monitor

1 set

21.5-inch

Standard

10

Printer

1 set

HP Color Printer

Standard

11

Protective Cover

1 set

Semi-Enclosed Protection

Standard

 

Detailed Configuration Description

No.

Item Name

Quantity

Description

Note

1

Pendulum

1 set

300J Square Hammer

Supplied with the machine

2

Pendulum

1 set

150J Square Hammer

Supplied with the machine

3

Dial

1 piece

Readable 0–300J

Installed on main machine

4

Impact Anvil

2 sets

R2 / GB Standard

Installed on main machine

5

Impact Blade

1 set

R8 / ASTM Standard

Optional

6

Testing Software

1 set

Fully Automatic Specialized Software

Installed on main machine

7

Low Temperature Gauge

1 set

Digital Display

Installed on main machine

8

Timer

1 set

Digital Display

Installed on main machine

9

Pendulum Transmission Device

1 set

Independently Manufactured by the Company

Installed on main machine

10

Pendulum Hook/Release Mechanism

1 set

Independently Manufactured by the Company

Installed on main machine

11

Start Clutch System

1 set

Tianjin Origin

Installed on main machine

12

Span Adjustment Template

1 piece

S=40

Supplied with the machine

13

Specimen Alignment Block

1 piece

10×40

Supplied with the machine

14

Foundation Bolts

4 sets

M16×250

Supplied with the machine

15

Allen Wrench Set

1 set

Independently Manufactured by the Company

Supplied with the machine

16

Jaws Including Jaw Base

2 sets

Independently Manufactured by the Company

Installed on main machine

17

Rotary Encoder

1 set

High-Precision Internal Control Type

Installed on main machine

18

Photoelectric Encoder

1 set

Automatic Induction Type

Installed on main machine

19

PLC

1 set

Programmable Logic Controller

Installed on main machine

20

Electrical Control System

1 set

Independently Manufactured by the Company

Installed on main machine

21

Positioning Cylinder

1 set

For Specimen Positioning

Standard

22

Feeding Cylinder

1 set

Automatic Specimen Transfer from Cold Chamber

Standard

23

Specimen Box

1 set

Bullet Clip Type

Standard

24

Vacuum Oil-Free Air Pump

1 set

750-30 with Pressure Regulator Valve

Standard

25

Manual, Packing List, Certificate

1 set

Company-Made

Standard

Refrigeration Range: Room Temperature ~ -196°C

Remarks:

1. Optional items are not included in the standard delivery and can be added as required on site, with additional cost.

2. One specimen box is included as standard. Additional boxes can be ordered as needed. The system supports simultaneous cooling of up to three specimen boxes (optional, separately charged).


Features of the Fully Automatic Low-Temperature Module

1. This module is an independently developed product by our company, with multiple technical advantages over other products on the market. It eliminates common issues such as specimen jamming and freezing.

2. Our uniquely designed specimen box allows up to three specimen boxes to be cooled simultaneously, depending on testing workload. This greatly improves testing efficiency and eliminates idle waiting time.

3. The feeding system developed by our company completes one full test cycle within 3 seconds, fully meeting both Chinese and American standards. Current market products require at least 10 seconds per test.

4. The automatic feeding module is made entirely of stainless steel to prevent corrosion caused by water vapor. It has a compact, rational design, easy to move and disassemble, and convenient for specimen alignment.

5. The automatic refrigeration chamber can store liquid nitrogen without leakage, ensuring the temperature reaches as low as -196°C and remains stable.

6. (In contrast, most products on the market use iron sheet with spray coating, which is prone to corrosion during refrigeration. Their bulky structure makes specimen alignment and movement inconvenient, and due to nitrogen leakage, they cannot reach the required -196°C, thus failing national quality inspection requirements.)

 

7. The machine is equipped with a cylinder pressure gauge, allowing precise regulation of intake air volume and maintaining stable air pressure to ensure even air supply to cylinders, preventing interruptions.

 

8. The system includes an air intake filter, preventing moisture from entering the air pump and damaging the cylinders, thereby extending cylinder lifespan.

 

9. The refrigeration chamber is equipped with steam and alcohol exhaust ports at the bottom to release moisture buildup during long-term use.

 

10. The exclusive bullet clip-type specimen box developed by our company effectively prevents specimen freezing, a common issue with conventional boxes once low temperature is reached. (Standard configuration includes one specimen box; additional boxes can be ordered separately to enable simultaneous cooling of three sets of specimens.)

 

11. The system uses liquid nitrogen refrigeration, equipped with a pressurized liquid nitrogen tank and a liquid nitrogen transfer hose. The cooling medium is liquid nitrogen, which can be stored in or directly added to the refrigeration chamber to achieve the lowest temperature. (Existing market products often suffer from specimen freezing, jamming, or cylinder blockage during testing.)

 

12. After the specimen is cooled to the required temperature in the low-temperature chamber, the feeding cylinder quickly transfers it to the jaw support, where the positioning cylinder ensures precise alignment, and the supporting cylinder stabilizes the specimen. The pendulum then strikes downward, data is recorded, and the test is completed — ready for the next automatic cycle.


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