1、 Instrument Overview
Suitable for PVC-U PVC-C pipes PP pipe Determination of impact toughness of pipes such as PE pipes and plastic pipes for underground communication pipelines. It is an ideal testing instrument for testing, production units, building materials industry, and scientific research institutions.
2、 Instrument characteristics
This testing machine has the function of preventing secondary impact, adopts an AC servo system, has fast hammer lifting speed, good positioning accuracy, high testing efficiency, small air resistance, and can automatically measure high
The lifting height of the falling hammer can be set arbitrarily, the lifting height of the hammer is automatically calibrated, the weight of the impact hammer can be adjusted, and it can be assembled through weights. The capture rate of the anti secondary impact device is 100%, The V-shaped iron is adjusted to adapt to the free falling motion of specimens with different pipe diameters and hammer bodies. Impact hammer bodies that meet other standards can be provided according to order requirements. The hammer release device and anti secondary impact device are achieved through pneumatic transmission. Two testing methods are applicable: the pass-through method and the gradient method.
Third level protection
First level sample compartment door safety protection; Second level observation window door safety protection; Third level upper and lower limit safety protection.
Quick lifting and lowering
The lifting speed of the hammer is fast, and the lifting rate can reach 250mm/sec, which can be achieved from zero to 2 meters and up to 8 seconds. The lifting height of the hammer can be set arbitrarily, and the impact height can be between 50mm and 2000mm. Any setting within the range (the capture rate of the anti secondary impact device within this height range is 100%);
Intelligent hovering
This machine adopts a multi-stage rate control program to ensure that the hammer stops smoothly and the control position has no deviation.
Gas exchange and release
Abandoning the traditional concept of electromagnetic hammer connection and electromagnetic hammer release, adopting a pneumatic structure with a greater force value that does not burn out. The hammer connection adopts a 300N long stroke dual cylinder and a cow tendon plate connection surface, ensuring stable connection without damaging the hammer head; The hammer release also adopts a pneumatic structure, fundamentally solving the problem of long-term bending, breakage, and leakage of cables used in electromagnetic hammer release. Pneumatic adopts a non pneumatic automatic locking structure, which is safe and reliable.
Integrated modular assembly
The electrical system adopts a 7-inch touch screen and Delta PLC, achieving process standardization, modular installation, and lightweight structure.
Most precious quality
All devices used are imported, the cylinder is from the Yadeke brand, and the touch screen is from the Delta brand, The PLC adopts Delta brand, and the power supply adopts Taiwan Mingwei brand. All electrical, mechanical, and software components are equipped with safety protection measures. Such as anti leakage, anti short circuit, anti static, anti interference, anti leakage, anti power outage, anti misoperation, etc.
High degree of automation
This instrument can automatically zero, automatically grasp the hammer, automatically lift the hammer, and perform automatic testing.
V-shaped iron is adjusted to adapt to different pipe diameters and plate specimens with varying thicknesses. After selecting special accessories for safety helmets, impact tests on safety helmets can be conducted;
Can provide impact hammer bodies that meet other standards according to order requirements;
The sample room is connected to the laboratory, and the temperature is the same as the test environment temperature.
3、 Compliant with standards

4、 Working principle
The true impact rate of the batch (or continuous extrusion production) of products can be measured by using a drop hammer of specified quality and size to impact the specified part of the test sample from the specified height. This test method can meet the technical requirements of different products by changing the mass or height of the falling hammer. The maximum allowable value for TIR is 10%.
True impact rate: When testing a batch of products, the total number of impact failures divided by the total number of impacts is the true impact rate, expressed as a percentage.
Destruction: When observed with the naked eye, the occurrence of cracks, cracks, or breakage of the sample after impact is called destruction. Dents or discoloration of the sample caused by drop hammer impact are not considered destruction. Main frame and guide rail:
Vertical fixation allows for adjustment and free release of the hammer. During calibration, the rate of impact of the hammer on the pipe should not be less than 95% of the theoretical rate.
Hammer body: The hammer body should comply with the provisions of Tables 1 and 2. The hammer head should be made of steel, with a minimum wall thickness of 5mm. The surface of the hammer head should not have visible defects such as dents or scratches that affect the test results. Hammers with masses of 0.5kg and 0.8kg should have a d25 type hammer head, and hammers with masses greater than or equal to 1kg should have a d90 type hammer head.
Sample holder: including a V-shaped support plate with a 120 ° angle, its length should not be less than 200mm, and its fixing position should be such that the vertical projection of the impact point of the hammer is within 2.5mm from the centerline of the V-shaped support plate. During arbitration inspection, a lead screw or bracket is used for top support.
Release device: can drop the hammer from any height of at least 2 meters, which refers to the height from the surface of the specimen, accurate to ± 10mm. There should be a device to prevent secondary impact of the falling hammer, and the rebound capture rate of the falling hammer should be ensured to be 100%.
Table 1 Dimensions of Drop Hammer Head Unit: mm

Table 2 Recommended hammer mass unit: kg

Sample preparation: The sample should be randomly selected and cut from a batch or continuous production of pipes. The cutting end should be perpendicular to the axis of the pipe, and the cutting end should be clean and undamaged.
Sample length: The sample length is (200 ± 10) mm
Sample marking: Samples with an outer diameter greater than 40mm should be marked with equidistant markings along their length direction and numbered sequentially. The number of lines drawn on samples of pipes with different outer diameters is shown in Table 3. For pipes with an outer diameter less than or equal to 40mm, each specimen shall be subjected to only one impact.
Table 3

Condition adjustment: The sample should be adjusted in a water or air bath at (0 ± 1) ℃ or (20 ± 2) ℃ for a short adjustment time as shown in Table 4. Water bath should be used for arbitration inspection.
Table 4 Schedule for adjusting the state of pipes with different wall thicknesses

After state adjustment, samples with wall thickness less than or equal to 8.6mm should be taken out of the air bath for 10 seconds or from the water bath for 20 seconds to complete the test. Samples with a wall thickness greater than 8.6mm should be taken out of the air bath within 20 seconds or from the water bath within 30 seconds to complete the test. If this time interval is exceeded, the sample should be immediately placed back into the pre-treatment device and subjected to at least 5 minutes of reprocessing. If the sample state is adjusted to a temperature of (20 ± 2) ℃ and the test environment temperature is (20 ± 5) ℃, the time from sample removal to test completion can be relaxed to 60 seconds.
5、 Test steps
1. Determine the weight and impact height of the hammer according to the product standards.
2. For specimens with an outer diameter less than or equal to 40mm, each specimen shall only be subjected to one impact.
When conducting impact tests on specimens with an outer diameter greater than 40mm, first place the hammer on the 1st marking line. If the specimen is not damaged, impact the 2nd marking line until the specimen is damaged or all markings are impacted once. Impact each sample one by one until the judgment result is obtained.
6、 Technical parameters

7、 Instrument configuration

Note: This instrument requires the customer to provide their own air compressor, with a maximum air pressure of 1.0 MPa