HLF-3 fixed pulley sensor

I. Structural Design and Specification Parameters

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The HLF-3 sensor is made of robust alloy steel, and its structural design has been optimized to effectively withstand complex loads during lifting operations. The sensor body integrates a fixed pulley function, and the force acts on the core component of the sensor through the pulley.

As can be seen from the structural parameter diagram, the sensor has clear key dimensions (A, B, C, H, F, R, H2) and installation hole positions (2-Φ1). These dimensions have been carefully designed according to different rated loads (specifications) :

​Small tonnage specifications (2t, 3t, 5t) :For instance, the 2t and 3t specifications share some dimensions (A=250mm, B=210mm, H=65mm), while the C value (related dimensions of the pulley groove) increases with the tonnage (32mm for 2t and 38mm for 3t). The installation hole diameter (2-Φ1) also increases with the tonnage (Φ13mm for 2t/3t and Φ17mm for 5t).

​Medium tonnage specifications (10t, 15t, 20t) :The size is correspondingly increased (for example, for the 15t/20t specification, A=350mm, B=295mm), the H value increases (for 15t/20t, it is 106mm), the R value (pulley radius) increases (for 15t, it is 80mm), and the installation hole diameter is also larger (for 15t/20t, it is Φ22mm).

​Large tonnage specifications (30t, 50t) :The size is further increased (for example, for the 50t specification, A=460mm, B=360mm), the H value (116mm for 50t) and R value (90mm for 50t) are larger, and the installation hole diameter reaches Φ26mm.

This stepped size design ensures the optimal performance of sensors of different tonnages in terms of structural strength and installation compatibility.

Second, outstanding technical performance indicators

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The HLF-3 type fixed pulley sensor not only has a sturdy structure, but also has excellent electrical performance, ensuring high precision and long-term stability in force measurement (Figure 2)

1. 1.​Core accuracy index​​Sensitivity1.0±0.005 mV/V. This is the core parameter of the relationship between the sensor's output signal and the input excitation voltage as well as the load it is subjected to. Its high precision and low dispersion ensure the accuracy of the measurement. ​Total Error:≤ ±3% F.S. (Full scale). This represents the maximum possible error of the sensor throughout the entire measurement range. ​Creep (30 minutes) :≤ ±0.02% F.S. It refers to the degree to which the sensor output changes slowly over time under a constant load. The smaller this value is, the better the long-term stability will be. ​Zero Balance≤ ±1% F.S. It refers to the degree to which the output signal of the sensor deviates from the ideal zero point under no-load conditions.

   ​Zero Temp.Effect:≤ ±0.02% F.S. / 10℃. Measure the influence of temperature changes on the zero-point output of the sensor.

   ​Output temperature influence (Span Temp.Effect) :≤ ±0.02% F.S. / 10℃. Measure the impact of temperature changes on the sensor's sensitivity (full-scale output).

2. 2.​Electrical characteristics and environmental adaptability​​Input Resistance:​ 750 ± 20 Ω。​Output Resistance703 ± 3 Ω. A stable impedance value contributes to the stability and anti-interference ability of signal transmission. ​Recommended Excitation voltage:​ 10~12V DC。​Maximum Excitation voltage (Max. Excitation)​ 15V DC。

   ​Insulation Resistance:≥ 5000 MΩ (usually the test voltage is 50V DC). The extremely high insulation resistance ensures electrical isolation between the internal circuit of the sensor and the metal body, enhancing safety and anti-interference capability.

   ​Operating Temp.Range:-30℃ to +70℃. Its wide temperature range enables it to adapt to various harsh industrial environments.

   ​Sealing grade:IP66. It offers excellent dust-proof and water-proof capabilities, making it suitable for outdoor and humid environments.

3. 3.​Safety and reliability​​Rated load (CapacityWe offer a variety of specifications ranging from 10t to 50t (common specifications include 10, 15, 20, 25, 30, 40, and 50t) to meet the needs of different lifting equipment. ​Safe Overload150% F.S." It refers to the maximum load that can be endured for a short period of time without causing permanent damage.Ultimate Overload200% F.S." It refers to the load limit that may cause damage to the sensor and is a manifestation of the safety margin in design. ​CableThe standard configuration includes a cable with an outer diameter of Φ5mm, which combines durability and wiring convenience.

​Iii.Summary​​

The HLF-3 type fixed pulley sensor, with its optimized structural design, robust alloy steel material and a series of high-precision electrical performance indicators (such as high sensitivity, low comprehensive error, excellent temperature stability and creep performance), has become a reliable choice in the field of force measurement for lifting equipment. Its wide rated load range (10t to 50t), excellent environmental adaptability (IP66 protection, wide temperature operating range), and strict safety standards (150% safe overload, 200% ultimate overload) ensure that it can provide accurate and stable force value measurement under various harsh working conditions. Ensure the safety and efficiency of lifting operations.