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DYE-300 Cement Compression Testing Machine
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- Product Description
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- Uses
This testing machine is specifically designed for determining the compressive strength of cement and other construction materials. It has a maximum load capacity of 300 kN, employs hydraulic loading, and features digital display of the applied load. The instrument offers high measurement accuracy, a long piston stroke, a compact structure, a modern design, simple operation, and convenient portability.
- Technical Specifications
1. Maximum load: 300 kN
2. Measurement range: 0–300 kN
3. Clear distance between pressure plates: 390 mm
4. Upper and lower platen dimensions: 150 mm × 200 mm
5. Piston diameter × maximum stroke: Φ125mm × 80mm
6. Maximum fluid pressure: 25 MPa
7. Accuracy: ±1%
8. Power supply: 380V (50Hz)
9. Motor power: 0.75 kW
10. Maximum piston lifting speed > 60 mm/min
11. Free fall speed of the piston > 35 mm/min
12. Testing machine noise ≤ 72 dB(A)
13. External dimensions (Length × Width × Height): 910 mm × 450 mm × 1300 mm
14. Overall machine weight: 350 kg
III. Structure
This machine consists of a frame, a digital force display unit, an oil pump, an oil supply valve, an oil return valve, and other components, forming a complete assembly. (See Figure 1.)
1. Frame Components: As shown in Figure 1, the hydraulic cylinder (9) and the crossbeam (2) are integrated into a single unit via two vertical columns (4). The upper pressure plate (3) can be securely fastened to the working hydraulic cylinder (9) mounted on the frame (11), with an internal sleeve that extends upward by 80 mm. When the piston rises, a dust seal (6) and a composite sealing gasket (10) housed within the cylinder are provided to prevent dust from entering. A slight oil leakage between the ball seat at the bottom of the male ball seat (5) and the cylinder is permissible; moreover, the cylinder wall is specially equipped with an oil‑drainage channel. This design minimizes friction between the working cylinder and the piston, thereby ensuring the accuracy of the testing machine.
The appearance and foundation drawing of the testing machine are shown in Figure 2.
2. Oil Pressure Digital Display Device
See the “Digital Force Gauge Instruction Manual” for details.
3. Oil pump (see Figure 3)
This machine is equipped with a five‑plunger axial high‑pressure oil pump, which is driven by an electric motor connected via a flat key (1). The pump operates smoothly and quietly. Inside the pump housing (5), the plunger sleeves (8) and plungers (9) are made of high‑quality alloy steel, heat‑treated and precision‑ground to ensure exceptionally fine mating surfaces, delivering excellent performance and high efficiency. As the pump’s main shaft (3) rotates, five axial plungers are arranged around its circumference. Each plunger is pressed against the swash plate (2) of the main shaft by the spring force (10). The five plungers are paired with five corresponding plunger sleeves. When the plungers reciprocate along with the swash plate, they perform the suction and discharge strokes. During the suction stroke, the steel ball (6) of the check valve (7) seals tightly against the valve port. Once the oil chamber is filled, the swash plate pushes the plungers back, first closing the inlet port and then compressing the oil to build up high pressure, which forces the check valve open and discharges the pressurized oil. The oil tank is mounted at the base of the frame, with a capacity sufficient to maintain stable operating conditions even during prolonged use, preventing excessive oil temperature rise that could compromise accuracy. The oil level in the tank can be monitored via the dipstick.
4. Oil Delivery Valve (see Figure 4)
The oil‑delivery valve is a分流式 flow‑regulating valve, consisting of a variable throttle and a constant‑differential pressure‑reducing valve connected in parallel. The inlet port is connected to the oil pump; when the handle (1) is turned, it drives the valve spool (2), causing the valve to open rhythmically. At this time, the pressurized oil supplied by the pump flows through the valve and is delivered via the oil line to the return valve, with the flow rate being adjustable. When the oil‑delivery valve is shifted to the right, the throttling is reduced; if the return valve is completely closed, the oil supplied by the pump pushes against the valve sleeve (7) and the valve stem (9) within the valve chamber, causing them to move rearward. Once they reach the position aligned with the return line, the oil from the pump connects to the three‑way valve, and the pressurized oil then flows through the return line. The circuit will only open when the oil pressure at the right end of the valve spool exceeds a certain threshold.
5. Oil Return Valve (see Figure 5)
The relief valve is a unloading switch: when the handle (1) is turned clockwise, the valve stem (2), fitted with a sealing O-ring (3), pushes the steel ball (4) against the valve body (5), closing the relief valve and directing all oil supplied by the delivery valve into the oil cylinder to apply pressure to the specimen. Conversely, turning the handle counterclockwise opens the relief valve, allowing oil from the delivery valve or from within the working cylinder to return to the oil tank via the return line. Its purpose is to enable operators to quickly relieve pressure in the working cylinder once the specimen has been crushed.
6. Hydraulic System Principle (see Figure 7)
Figure 4: Oil from the oil tank (1) is drawn into the oil pump (3) via the oil filter (2) and delivered through the oil line (4) to the delivery valve. When the delivery valve (5) and the return valve (7) are fully closed, high-pressure oil flows through the oil lines (6) and (8) into the working cylinder (9), causing the piston inside the working cylinder to rise and generate pressure.
- Testing machine operation
- After connecting the power supply, close the oil supply valve and open the oil return valve. Press the motor start button to activate the force gauge and...
Preheat the oil pump for at least 10 minutes.
- Operate the test in accordance with the operating procedures specified in the Digital Force Gauge Instruction Manual.
- Installation, test run, and maintenance
- The testing machine should be installed in a clean, dry environment with uniform temperature and humidity, free from vibrations and corrosive gases.
In the room
2. The installation location should be appropriately positioned—typically 60–80 cm from the wall—to facilitate operation and routine maintenance. The foundation must be solid and reliable.
3. Horizontal adjustment method for the machine:
Use a 0.02/1000 level to measure the column, adjusting it horizontally in both directions until it reads one division. If the deviation exceeds one division, shims can be added beneath the base for correction.
4. Electrical Appliance Instructions (Figure 5)
The power supply is three-phase AC, 380 V at 50 Hz. After connecting the power, the instrument displays readings. Press the motor start button; the motor indicator light will illuminate, and the oil pump motor D will begin operating. The oil pump’s main shaft does not reverse direction. To manually stop operation, press the green button again to disconnect the motor’s power supply. Additionally, the circuit includes an overload protection device: if the piston stroke exceeds the specified limit or the pressure rises by 2% to 6% above the rated pressure, the testing machine automatically cuts off the power, and the oil pump stops. The fourth wire in the power cable serves as the grounding conductor; this unit must be reliably grounded.
5. Oil Filling and Draining:
Open the rack door, remove the oil filler plug on the tank, add approximately 15 liters of hydraulic oil, and check the oil level against the dipstick on the side of the tank. Due to variations in climate, the type of hydraulic fluid used may differ slightly; the recommended oil specifications are as follows:
(1) When the ambient temperature is 15±5℃, it is recommended to use GB443-84 N46 (equivalent to No. 30 mechanical oil).
(2) When the ambient temperature is 25±5℃, it is recommended to use DB443-84N68 (equivalent to No. 40 mechanical oil). To drain the oil, simply unscrew the drain plug located at the bottom of the frame. If the oil appears cloudy or has been in use for more than one year, it should be replaced immediately, and the oil tank should be cleaned at the same time.
6. Close the return oil valve, start the oil pump motor, and run it for 2 to 5 minutes to purge any residual air from the pump and the oil lines.
7. Keep both the interior and exterior of the machine clean at all times. Regularly apply oil to unprotected surfaces to prevent rust, and cover the machine with a protective cover when not in use.
VI. Faults and Their Troubleshooting Methods
Serial number Phenomenon Reason Elimination method 1 The oil pump is not pumping oil. 1. Air is present in the oil pump. 2. The oil filter is clogged. 3. The outlet valve seat does not properly mate with the steel ball, and there are scratches and burrs on both the ball and the seat. 1. Open the high-pressure outlet fitting of the oil pump to bleed air, or reverse the motor’s phase connection. 2. Clean the oil filter. 3. Replace or repair the relevant components. 2 The oil pump delivers fuel unevenly. 1. The oil viscosity is too low (too thin) or the oil is too dirty. 2. Air has entered the oil circuit. 3. There is debris or scoring between the oil delivery valve piston and its bushing. 4. There are oil leaks. 1. Replace the cleaning oil with one of appropriate viscosity. 2. Bleed the air from the oil circuit; after the piston has risen a short distance, open the return oil plug. 3. Clean and grind any parts that have become roughened. 4. Locate the oil leak and eliminate it. 3 Oil pump line (the return oil from the delivery valve is intermittent, and the force gauge readings are unstable) 1. Air is present in the oil pump. 2. The oil viscosity is too low (too thin). 3. The throttling needle clearance of the delivery valve is excessively large. 4. Contaminants are inside the oil pump. 5. The valve seat within the oil pump does not properly mate with the steel ball, and there are scratches or burrs on both the ball and its seat. 1. Bleed the air 2. Replace with the appropriate hydraulic fluid 3. Reduce the clearance of the throttle needle 4. Clean the oil pump 5. Replace or repair the relevant components 4 The hydraulic pressure cannot reach the maximum load. 1. The spool of the oil delivery valve is too tightly fitted into its sleeve, or foreign debris is lodged inside. 2. The spring force of the oil delivery valve is too weak. 3. There are oil leakage points: (1) Oil leakage at the front end of the oil delivery valve; (2) Oil leakage at the pipe joint; (3) Excessive clearance between the working piston; (4) Misalignment of the needle valve port in the return oil valve. 1. Clean or grind the relevant parts. 2. Add washers to the spring end faces or replace the springs. 3. Eliminate oil leakage: (1) Tighten the threaded sleeve; (2) Replace the washer and then tighten; (3) Replace the sealing ring; (4) Press the valve port with a steel ball or replace the steel ball. 1
2 1. Nut
3 12 2. Crossbeam
13 3. Upper Press Plate
4 15 4, Column
14 5. Male ball seat (lower pressure plate)
5 6. Dust seal
6 16 7, Concave Spherical Seat
7 17 8, Piston
8 9. Hydraulic cylinder
9 10. Combined sealing gasket
10 11, Rack
12. Digital Force Display Device
11 13. Motor operation indicator light
14. Limit Switch
15. Motor Start Button
16. Oil Return Valve
17. Oil Delivery Valve
Figure 1: Simplified Diagram of the Testing Machine
340 200
4-M12×300 anchor bolt
815
860
Figure 2: Outline and Foundation Drawing of the Testing Machine
Reasons to Choose Us
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Factory Advantages
Deep expertise, comprehensive product range
√Over 10 years of dedicated R&D and manufacturing of testing instruments for highway, construction, geotechnical, asphalt, cement, and other engineering applications.
√Comprehensive category coverage: from raw material testing to construction quality control, a one-stop solution.
√Compliant with international standards such as ISO and GB, meeting the regulatory requirements of overseas projects.
Reliable quality and excellent value for money.
√ We strictly adhere to the ISO 9001 quality management system, select core components from internationally renowned brands, and conduct full inspection before shipment.
√ In-house manufacturing + a large-scale supply chain deliver strong price competitiveness, with no markups from intermediaries.
√Stable and durable, with a low failure rate, reducing operational and maintenance costs for overseas customers.
Efficient delivery, global service
√In-stock inventory plus flexible manufacturing ensures 7–15 day rapid delivery, with support for customized rush orders.
√Cangzhou’s Lin’gang District boasts a strategic location, with convenient sea and air transportation and globally traceable logistics.
√Multilingual team with 24-hour technical support, offering installation and commissioning, training, a three‑year warranty, and ongoing follow-up services.
Operating with integrity and backed by extensive experience.
√13 years of industry expertise, serving over 30 countries and regions worldwide.
√The principle of “integrity in business, mutual benefit.”
√Deep understanding of international engineering standards and procurement processes, with efficient communication and seamless collaboration.
Frequently Asked Questions
Is the universal materials testing machine experiencing loading stalling or abnormal zeroing of load data?
1. Loading lag: Clean the lead screw and guide rails, apply lubricant, and remove debris from the transmission components. 2. Zeroing anomaly: Restart the equipment system, calibrate the load and displacement zero points, and check for poor electrical contact in the sensor wiring. 3. Overloading is strictly prohibited; before testing, verify that the grips are securely tightened to prevent eccentric loading of the specimen.
How often should in‑instrument verification be performed? Which instruments are required to undergo it?
High‑precision, high‑frequency‑use, and drift‑prone equipment (such as balances, penetration testers, water permeability testers, and sensor‑type devices) shall undergo intermediate verification every three months; routine equipment shall be verified every six months. Equipment that is within the verification/calibration interval, has been repaired following a malfunction, or has been relocated must undergo additional intermediate verification, with complete verification records maintained.
Is the repeatability of pendulum-type pavement friction coefficient measurements poor?
Key points for resolution: Prior to testing, thoroughly clean the pavement at each measurement point, ensuring there is no standing water, dust, or debris; calibrate the instrument’s level and zero point to ensure a standardized pendulum‑drop trajectory; strictly control the pendulum’s sliding distance; avoid conditions such as strong winds, wet pavement, or abrupt temperature changes; and calculate the average of multiple measurements taken at the same point.
How should one handle cases where the pavement infiltration meter data exceeds allowable error limits, exhibits leakage, or shows abnormal readings?
1. Sealing leaks: Inspect the base seal for aging or damage and replace it promptly; before testing, firmly press down on the base to expel any residual air inside. 2. Data deviation > ±2%: Calibrate the level sensor, clean any fouling from the graduated cylinder, and check for damage to the scale markings. 3. Compliance with new regulations: For seepage rates ≤ 300 mL/min, existing equipment may continue to be used; for rates > 300 mL/min, the accuracy of older equipment fails to meet standards, and such equipment must not be used.
Can the old Marshall compaction apparatus and stability tester still be used?
According to the 2025 revised asphalt testing procedures, after adjusting the indenter configuration on the Marshall stability test apparatus, existing instruments currently in use may continue to be operated normally without mandatory replacement; only periodic calibration to maintain accuracy and ensure equipment integrity is required.
What are the causes of uneven compaction and layered cracking in molded specimens during compaction testing?
Main causes: non‑vertical drop of the compaction hammer, rail jamming, excessive deviation in hammer weight, uneven layer thickness during loading, insufficient number of blows, or overload. Solutions: regularly lubricate the guide rails; verify and correct the vertical alignment of the hammer; strictly follow the procedure for layered material placement and step‑by‑step compaction; ensure that hammer weight and drop height comply with standards; and prevent over‑thick layers.
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