Article abstract: This paper introduces a newrevised design and test data of special load cell for crane scales 
Key words: crane scale; load cell; safety factor
I. Introduction
As an electronic balance, the hook scale is widely used in the 1990s, and the appearing of the cross -tuber tension sensor (special sensor for hanging scales, hereinafter referred to as "LN type sensor").
The promotion and application of the hook scales played a role in helping the flames. The LN sensor has a variety of unique excellent performance, especially with good anti -loading performance. After using the sensor, the overall level and performance of the hook scale greatly improved, which greatly enhanced the practicality of the hook scale. Therefore, the LN sensor has almost replaced all other sensors in the wireless hanging scale, and has been in use for more than 20 years for a long time. In the direct view of the hanging scale, due to the different installation structure, the design extended from the LN sensor technology is also adopted. In recent years, we have made some improvement design on the sensor structure according to some problems that have occurred in the LN sensor in use.
Get satisfactory results.
2. Improved design of sensors
The traditional LN type sensor is improved on the basis of the blind hole thin -walled tensile sensor, mainly to cut and process the stress gap thread into a cross -shaped tendon, and use two snails up and down.
The pattern is used to connect the upper and lower joints and hook rings, respectively. A small cylinder connection transition is used between the thread part and the intermediate strain region. This improved sensor in the middle of the sensor remains unchanged. The upper and lower threads are thick, and the knife groove is canceled. The transition part is changed from a circular section to a rectangular section. The purpose of improvement is to further improve the safety factor on the premise of maintaining the original measurement performance of the sensor. Improve some parameters of the front and rear sensors. It can be seen from the parameters that the improved sensor that can bear the maximum tensile force and maximum bending moment are greatly improved.
3. Measurement performance test
We conducted a series of tests (as shown in Table 2, Table 3) for the improved sensor and the assembly hook scales, and the measurement performance meets the expected requirements.
4. end language
Judging from the test results, the performance of the improved scales sensor has reached the expected indicators. Because this improvement has made some changes in the connection size of the sensor, some problems have been used for customers who have adopted the company's products for a long time. They also need to change the connection parts. However, after a period of trial of the improved sensor for a period of time, the new products have been fully recognized and started batch ordering.