Main Applications: The DYE-2000S series, a fully computer-controlled constant‑stress pressure testing machine, is primarily used to determine the compressive strength of building materials such as bricks, stones, and concrete. It is essential testing equipment for construction firms, building material manufacturers, highway and bridge engineering organizations, quality inspection agencies, and transportation research institutes. This machine features electric‑hydraulic, computer‑controlled loading and load measurement via hydraulic pressure sensors. It offers functions including display of loading‑rate control curves, retention of peak failure values, data storage, printing, query capabilities, and conversion of test results to compressive strength. The equipment complies with GB/T 50081‑2002 “Standard for Test Methods of Mechanical Properties of Ordinary Concrete” and meets the requirements of GB/T 3159‑2008 “Hydraulic Universal Testing Machine.” Main Technical Parameters: 1) Maximum Load: 2000 kN 2) Testing Machine Class: Class 1 3) Minimum Resolution: 0.1 kN 4) Maximum Distance Between Pressure Plates: 320 mm 5) Upper Pressure Plate Dimensions: 220 × 250 mm 6) Lower Pressure Plate Dimensions: 220 × 250 mm 7) Piston Diameter × Maximum Stroke: Φ250 × 30 mm 8) Motor Power: 0.75 kW 9) Input Voltage: — Electric motor section: ~380 V ±10%, 50 Hz — Computer section: ~220 V ±10%, 50 Hz 10) Overall Dimensions of the Testing Machine: 850 × 650 × 1800 mm 11) Net Weight: 750 kg

The TCLC‑2 drop‑hammer impact testing machine complies with GB/T 14150‑2001 “Test Method for External Pressure Resistance of Thermoplastic Plastic Pipes—Clockwise Rotational Method” and GB/T 45153‑2001 “General Principles for Drop‑Hammer Testing of Rigid Plastics,” while also meeting the requirements of ISO 3127 for testing equipment. It is suitable for drop‑hammer impact tests on various sheet and pipe materials.

The fixture for the positive‑and‑negative bending test of reinforcing steel falls within the field of cyclic bending of steel bars and provides a drive mechanism for such tests. The key technical features of the solution are as follows: it comprises a pivot shaft mounted on a rotating arm and a gear fixed to the end of the pivot shaft opposite the rotating arm; the pivot shaft extends beyond the base of the rotating arm, and the gear is connected to an automatic drive unit that rotates the gear.

The CBC4320 rebar residual‑deformation tester features a dual‑sided extensometer system composed of two high‑precision, variable‑gauge extensometers with consistent sensitivity, enabling direct measurement of the average deformation on both sides of the specimen for highly accurate results. It is equipped with a four‑digit, three‑row, two‑input high‑precision digital display; its circuitry incorporates a 24‑bit A/D high‑precision IC chip, providing real‑time display of the true deformation values from both extensometers with stable and reliable readings.

The GAW-1000B electro-hydraulic servo steel strand testing machine employs a hydraulic power unit, electro-hydraulic servo control technology, and computer-based data acquisition and processing, enabling closed-loop control and automated testing. It consists of four main components: the testing frame, the oil source (hydraulic power unit), the measurement and control system, and the test fixtures, with a maximum test force of 1000 kN.

The GW-40B rebar bending testing machine is a testing device used for performing planar bending tests on reinforcing steel. Its key technical parameters and performance indicators comply with GB/T 1499.2-2018, and it is also suitable for on-site rebar bending in the construction industry, enabling dual functionality—testing and construction—on a single unit.

DYE-2000 Electro-Hydraulic Concrete Compression Testing Machine I. Introduction to the DYE-2000 Electro-Hydraulic Concrete Compression Testing Machine Source: Hebei Xinluda Road & Bridge Instrument Factory Product Overview: The DYE-2000 electro-hydraulic concrete compression testing machine is a newly developed, self‑designed product primarily used to determine the compressive strength of construction materials such as concrete, bricks, stones, cement, and refractory bricks. This testing machine employs hydraulic transmission, allowing direct reading of the applied load on the force gauge’s display—simple and fast. It features a compact structure, convenient operation, and high measurement accuracy, making it an essential piece of equipment for engineering and construction organizations in fields including architecture, building materials, highways, bridges, mining, and universities. II. Main Technical Parameters of the DYE-2000 Electro-Hydraulic Concrete Compression Testing Machine: 1. Maximum test force: 2000 kN 2. Rated pressure of hydraulic pump: 40 MPa 3. Relative indication error: ±1% 4. Size of pressure plate: 250 × 220 mm 5. Maximum clear distance between pressure plates: 320 mm 6. Maximum piston stroke: 50 mm 7. Force measurement range: 0–200 kN 8. Force resolution: - 0–1000 kN: 0.01 kN - 1000–2000 kN: 0.1 kN 9. Overall dimensions (L × W × H): 890 × 370 × 1160 mm 10. Net weight: 710 kg 11. Packing dimensions: 1080 × 580 × 1360 mm

Purpose: This testing machine is specifically designed to determine the compressive strength of cement and other construction materials. It has a maximum load capacity of 300 kN, employs hydraulic loading, and features a digital display for load readings. The machine offers high accuracy, a large piston stroke, a compact structure, a modern design, easy operation, and convenient portability. Technical Parameters: 1. Maximum Load Capacity: 300 kN 2. Measurement Range: 0–300 kN 3. Clear Distance Between Pressure Plates: 390 mm 4. Dimensions of Upper and Lower Pressure Plates: 150 mm × 200 mm 5. Piston Diameter × Maximum Stroke: Φ125 mm × 80 mm 6. Maximum Hydraulic Pressure: 25 MPa 7. Accuracy: ±1% 8. Power Supply: 380 V (50 Hz) 9. Motor Power: 0.75 kW 10. Maximum Piston Rising Speed: >60 mm/min 11. Free Falling Speed of Piston: >35 mm/min 12. Noise Level: ≤72 dB(A) 13. Overall Dimensions (L × W × H): 910 mm × 450 mm × 1300 mm 14. Machine Weight: 350 kg III. Structure: This testing machine consists of a frame, a digital force display unit, an oil pump, an oil delivery valve, an oil return valve, and other components, forming a complete system (see Figure 1). 1. Frame Components: As shown in Figure 1, the hydraulic cylinder (9) and crossbeam (2) are connected by two vertical columns (4), forming a unified structure. The upper pressure plate (3) can be securely attached to the working hydraulic cylinder (9) mounted on the frame (11). Inside the cylinder, there is an internal sleeve that allows for an upward stroke of 80 mm. To prevent dust from entering the cylinder during piston movement, a dust seal (6) and a combined sealing gasket (10) are installed. A small amount of oil leakage between the ball seat at the bottom of the male ball seat (5) and the cylinder is permissible; additionally, the cylinder wall is equipped with a dedicated oil overflow channel. This design minimizes friction between the working cylinder and the piston, ensuring high precision. Refer to Figure 2 for the overall appearance and foundation layout of the testing machine. 2. Digital Force Display Unit: See the “Digital Force Gauge Instruction Manual” for details. 3. Oil Pump (see Figure 3): This machine uses a five‑plunger axial high‑pressure oil pump, driven by an electric motor via a flat key (1). The pump operates smoothly and quietly. The pump body (5) contains high‑quality alloy steel plunger sleeves (8) and plungers (9), all heat‑treated and precisely ground to ensure superior fit and performance. The main shaft (3) rotates, distributing five axial plungers around its circumference. Each plunger is pressed against the inclined disc (2) of the main shaft by spring tension (10). The five plungers work in tandem with their respective sleeves, performing suction and discharge actions as they reciprocate with the inclined disc. During suction, the steel ball (6) of the one‑way check valve (7) seals tightly against the valve opening. Once the oil chamber is full, the plunger is pushed back by the inclined disc, first closing the inlet and then compressing the oil to generate high pressure, which forces the one‑way valve open and expels the pressurized oil. The oil tank is positioned at the base of the frame, providing sufficient oil storage to sustain prolonged operation without excessive temperature rise that could affect accuracy. Oil levels can be monitored via the oil dipstick. 4. Oil Delivery Valve (see Figure 4): This is a分流式 flow‑regulating valve composed of a variable throttle and a constant differential pressure relief valve connected in parallel. The inlet connects directly to the oil pump. Rotating the handle (1) drives the valve core (2), allowing the valve to open rhythmically. Pressurized oil supplied by the pump flows through the valve into the oil return line, with adjustable flow rates. When the valve is shifted to the right, the flow rate decreases; if the return valve is completely closed, the oil delivered by the pump remains trapped within the delivery valve chamber. The relief valve core sleeve (7) and stem (9) move backward until they reach the return pipe position, where the pump’s oil connects to the three‑way valve, enabling pressurized oil to flow through the return pipeline. Only when the oil pressure at the right end of the valve core exceeds a certain threshold does the circuit open. 5. Oil Return Valve (see Figure 5): This is a relief switch. Turning the handle clockwise (1) causes the valve stem (2), fitted with a sealing O‑ring (3), to push the steel ball (4) against the valve body (5), thereby closing the return valve. All oil delivered by the oil delivery valve is directed into the working cylinder to apply pressure to the test specimen. Conversely, turning the handle counterclockwise opens the return valve, allowing oil from the delivery valve or the working cylinder to flow back into the oil tank via the return line. Its purpose is to relieve pressure in the working cylinder once the test sample has been crushed, enabling operators to quickly release pressure. 6. Hydraulic System Principle (see Figure 7): In Figure 4, oil from the tank (1) passes through the oil filter (2) before being drawn into the oil pump (3). The oil is then conveyed through the oil pipe (4) to the oil delivery valve. When both the delivery valve (5) and the return valve (7) are fully closed, high‑pressure oil enters the working cylinder (9) via the oil pipes (6) and (8), causing the piston inside to rise and generate pressure. Testing Machine Operation: After connecting the power supply, close the oil delivery valve and open the oil return valve. Press the motor start button to preheat the force gauge and oil pump for at least 10 minutes. Operate the testing machine according to the procedures outlined in the “Digital Force Gauge Instruction Manual.” Installation, Commissioning, and Maintenance: The testing machine should be installed in a clean, dry room with stable temperature and humidity, free from vibrations and corrosive gases. 2. The installation location should be appropriately chosen—typically 60–80 cm away from walls—to facilitate operation and maintenance. The foundation must be solid and reliable. 3. Horizontal adjustment method: Use a 0.02/1000 level instrument to measure the vertical columns, aligning them horizontally to within one division in both directions. If the deviation exceeds one division, add shims under the base for correction. 4. Electrical Instructions (Figure 5): The power supply is three‑phase AC, 380 V, 50 Hz. After connecting the power, the meter will display readings. Press the motor start button; the indicator light will illuminate, and the oil pump motor D will begin operating. The pump’s main shaft does not reverse rotation. If you need to manually stop the machine, press the green button to cut off the motor power. Additionally, an overload protection device is integrated into the circuit: if the piston stroke exceeds the specified limit or the pressure surpasses the rated value by 2%–6%, the testing machine will automatically shut down, stopping the oil pump. Another wire in the four‑core power cable serves as the grounding wire; ensure the machine is reliably grounded. 5. Oil Filling and Draining: Open the frame door, remove the oil filler plug on the tank, and add approximately 15 liters of hydraulic oil. Monitor the oil level using the side-mounted dipstick. Due to climate variations, the recommended oil types may differ slightly. Here are the suggested specifications: (1) When the ambient temperature is 15°C ± 5°C, use GB443-84 N46 (equivalent to No. 30 mechanical oil). (2) When the ambient temperature is 25°C ± 5°C, use DB443-84 N68 (equivalent to No. 40 mechanical oil). For draining, simply unscrew the drain bolt located at the bottom of the frame. If the oil appears cloudy or has been used for over a year, replace it immediately and thoroughly clean the oil tank. 6. Close the oil return valve, run the oil pump motor for 2–5 minutes to purge any residual air from the pump and oil lines. 7. Keep both the interior and exterior of the machine clean at all times. Regularly apply anti‑rust oil to unprotected surfaces, and cover the machine with a protective cover when not in use.VI. Faults and Troubleshooting Methods | No. | Symptom | Cause | Troubleshooting Method | |-----|-----------------------------|-----------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------| | 1 | Oil pump does not deliver oil | 1. Air in the pump; 2. Clogged oil filter; 3. Misalignment between the outlet valve seat and ball, with scratches or burrs on the ball and seat. | 1. Open the high-pressure outlet connection to bleed air or reverse the pump motor’s polarity; 2. Clean the oil filter; 3. Replace or repair the relevant parts. | | 2 | Unstable oil delivery | 1. Oil viscosity too low (too thin) or excessively dirty; 2. Air in the oil circuit; 3. Contaminants or scoring between the delivery valve piston and its bushing; 4. Oil leakage. | 1. Use oil of appropriate viscosity; 2. Bleed air from the oil circuit—raise the piston slightly then open the return plug; 3. Clean and grind any scored components; 4. Locate and fix the leak. | | 3 | Intermittent return flow | 1. Air in the pump; 2. Oil viscosity too low (too thin); 3. Excessive clearance in the delivery valve needle; 4. Contaminants inside the pump; 5. Misalignment between the valve seat and ball, with scratches or burrs on the ball and seat. | 1. Remove trapped air; 2. Replace with suitable oil; 3. Reduce clearance of the delivery valve needle; 4. Clean the pump; 5. Replace or repair the affected parts. | | 4 | Pressure fails to reach maximum load | 1. Delivery valve spool tightly fitted or jammed with debris; 2. Spring force of the delivery valve too weak; 3. Oil leakage at: (1) front end of the delivery valve; (2) pipe joints; (3) excessive clearance of the working piston; (4) mismatch between the return valve needle and its seat. | 1. Clean or grind the relevant parts; 2. Add a washer to the spring end or replace the spring; 3. Eliminate leaks by: (1) tightening threaded sleeves; (2) replacing washers and retightening; (3) changing sealing rings; (4) pressing the valve seat with a steel ball or replacing the ball. | **Figure 1: Simplified Structural Diagram of the Testing Machine** - Base bolts: M12 × 300, quantity: 4 - Foundation dimensions: 340 mm × 200 mm - Ground anchor bolts: M12 × 815, quantity: 8 - Column height: 600 mm **Figure 2: Outline and Foundation Diagram of the Testing Machine**

The CLD‑3 static cone penetrometer uses mechanical transmission to press the probe into the soil at a constant rate. It is suitable for testing in soft soils, cohesive soils, loess, sandy soils, and other strata. By measuring the resistance generated when the probe contacts the soil, it converts this resistance into an electrical signal that is transmitted to surface‑mounted measuring instruments. The entire unit features lightweight components, a compact footprint, easy portability and installation, high operational efficiency, and compatibility with probes and tips of various diameters.

DYE-2000S Computer‑Controlled Fully Automatic Constant‑Stress Compression Testing Machine 1. Main Applications The DYE‑2000S series of computer‑controlled, fully automatic constant‑stress compression testing machines is primarily used to determine the compressive strength of building materials such as bricks, stones, and concrete. It is essential testing equipment for construction firms, building material manufacturers, highway and bridge engineering organizations, quality inspection agencies, and transportation research institutes. This machine features electric‑hydraulic, computer‑controlled loading and load measurement via hydraulic pressure sensors. It offers functions including display of loading‑rate control curves, retention of peak failure values, data storage, printing, query capabilities, and conversion of test results to compressive strength. The machine complies with GB/T 50081‑2002 “Standard Methods for Mechanical Performance Tests of Ordinary Concrete” and meets the requirements of GB/T 3159‑2008 “Hydraulic Universal Testing Machines.” 2. Main Technical Parameters 1) Maximum Load: 2000 kN 2) Testing Machine Class: Class 1 3) Minimum Resolution: 0.1 kN 4) Maximum Distance Between Pressure Plates: 320 mm 5) Upper Pressure Plate Dimensions: 250 mm × 250 mm 6) Lower Pressure Plate Dimensions: 250 mm × 250 mm 7) Piston Diameter × Maximum Stroke: Φ240 × 30 mm 8) Motor Power: 0.75 kW 9) Input Voltage: — Electric motor section: ~220 V ±10%, 50 Hz — Computer section: ~220 V ±10%, 50 Hz 10) Overall Dimensions of the Testing Machine: 850 × 650 × 1800 mm 11) Net Weight: 570 kg

DYE-2000 Electro-Hydraulic Concrete Compression Testing Machine I. Introduction to the DYE-2000 Electro-Hydraulic Concrete Compression Testing Machine Source: Hebei Xinluda Road & Bridge Instrument Factory Product Overview: The DYE-2000 electro-hydraulic concrete compression testing machine is a newly developed, self‑designed product primarily used to determine the compressive strength of construction materials such as concrete, bricks, stones, cement, and refractory bricks. This testing machine employs hydraulic transmission, allowing direct reading of the applied load on the force gauge’s display—simple and efficient. Featuring a compact structure, user‑friendly operation, and high measurement accuracy, it is an essential piece of equipment for engineering and construction organizations in fields including architecture, building materials, highways, bridges, mining, and universities. II. Main Technical Parameters of the DYE-2000 Electro-Hydraulic Concrete Compression Testing Machine: 1. Maximum test force: 2000 kN 2. Rated pressure of hydraulic pump: 40 MPa 3. Relative indication error: ±1% 4. Size of pressure plate: 250 × 220 mm 5. Maximum clear distance between pressure plates: 320 mm 6. Maximum piston stroke: 50 mm 7. Force measurement range: 0–200 kN 8. Force resolution: - 0–1000 kN: 0.01 kN - 1000–2000 kN: 0.1 kN 9. Overall dimensions (L × W × H): 890 × 370 × 1160 mm 10. Net weight: 710 kg 11. Packing dimensions: 1080 × 580 × 1360 mm

DYE-300S Cement Flexural and Compressive Strength Testing Integrated Machine The DYE-300S cement flexural and compressive strength testing integrated machine is primarily used for determining the flexural and compressive strengths of cement mortar. With its compact structure and simple operation, it is an ideal piece of equipment for cement plants, construction engineering units, quality inspection stations, and colleges and universities. It is also widely employed for testing the compressive strength of materials such as bricks, stones, cement, and concrete, as well as for evaluating the compressive performance of other materials. I. Main Technical Parameters | Parameter | Compression Section | Flexural Section | |---|---|---|---| | Load Capacity (kN) | 300 | 10 | | Indication Relative Error (%) | ≤ ±0.5% | ≤ ±0.5% | | Piston Diameter × Stroke (mm) | Φ125 × 100 | Φ60 × 100 | | Platen Diameter (mm) | Φ160 | Φ160 | | Distance Between Plates (mm) | 200 | 200 | | Loading Rate (kN/s) | 0–10 | 0–0.75 | | Test Force Measurement Range | 4%–100% | 4%–100% | | Test Force Application Error | ±5% | ±5% | | Input Voltage (V) | 380 | 380 | | Motor Power (kW) | 0.75 | 0.75 | | Overall Dimensions (L×W×H, mm)| 1220 × 500 × 1250 | 1220 × 500 × 1250 | | Host Weight (kg) | 550 | 550 | II. Installation of the Testing Machine The foundation for installing this testing machine must be solid and reliable. To facilitate operation and ensure accurate readings, the base may be raised slightly above ground level according to actual requirements. A clearance of at least 0.7 meters should be maintained around the machine to allow for convenient maintenance and operation. Anchor bolts (M12 × 300 mm) must be installed using a two-stage grouting process to ensure proper embedding. (See installation diagram.) During installation, ensure the machine remains level (levelness ≤ 0.2/1000). Use a frame-type spirit level with a sensitivity of 0.1/1000 to measure the flatness of the lower platen. If horizontal or vertical deviations exceed specified limits, adjust by adding shims under the baseplate, then tighten the anchor nuts. Finally, connect the power supply; the electrical system must include grounding protection, and voltage fluctuations should not exceed ±10% of the rated value. III. Maintenance and Servicing 1. Install the testing machine in a clean, dry environment with uniform temperature, free from vibrations and corrosive gases. 2. Keep the machine clean; regularly lubricate all exposed parts to prevent rusting. 3. After six months to one year of use, change the hydraulic oil once. When replacing, thoroughly clean the oil tank and oil filter. To clean the tank, pour kerosene into it, let it soak, then drain it out. Repeat several times until completely clean, and wipe the tank bottom with a towel before refilling with fresh hydraulic oil. If the hydraulic oil becomes severely cloudy and unusable, replace it immediately; otherwise, accelerated wear on hydraulic components may compromise measurement accuracy. Recommended hydraulic oil specifications based on ambient temperature: (1) For ambient temperatures between 10°C and 20°C, use GB-443-84 N46# (equivalent to No. 30 mechanical oil). (2) For ambient temperatures between 20°C and 30°C, use GB-443-84 N86# (equivalent to No. 40 mechanical oil). 4. When not in use, cover the machine with a plastic protective cover. IV. Miscellaneous

This ring flexibility and ring stiffness testing machine for plastic pipes employs computer‑based control, data acquisition, analysis, and processing. It features three closed‑loop control modes—stress, strain, and displacement—and can perform constant‑load, constant‑deformation, as well as stress‑rate and strain‑rate control, with seamless, impact‑free mode switching during testing. It generates stress–strain, force–time, and stress–displacement curves and can produce printed test reports.

The JAW-1000A microcomputer-controlled electro-hydraulic servo manhole cover pressure testing machine is used to evaluate the load-bearing capacity of manhole covers made from various materials, including residual deformation and test load. It supports closed-loop control modes such as constant-rate loading and constant-rate deformation, and can automatically calculate the specimen’s technical parameters.