Since the total pressure of multiple wheels is measured, the measuring range of the test equipment is required to be higher, and the maximum range of the pressure sensor should be greater than 875 kN to measure the pressure at the gate leg. Large bucket turbines have a large number of rounds on one leg, and sometimes it is not realistic to measure the pressure of the outriggers. If the pressure at the four-wheeled trolley is measured, the maximum range of the sensor should be greater than 500 kN; If the pressure at the tricycle is measured, the maximum range of the sensor should be greater than 375 kN. The ability of the auxiliary tool jack and the strength of the support seat need to be matched one-to-one. The volume and quality of the test tools are very large, requiring 2 to 3 people to be transported to the site, and the cost of personnel input and lifting equipment is very large.

Bucket turbine walking mechanism wheel pressure test point, walking mechanism adopts a balanced trolley structure, through articulation to remove too many constraints to ensure the transmission of vertical directional force flow, to ensure that the wheel pressure of all wheels under the same leg of the door seat is equal. Specifications usually require a maximum wheel pressure of 250 to 300 kN for a single wheel design.
An important measuring instrument for wheel pressure testing is the pressure sensor. Piezoresistive pressure sensors have extremely low price and high accuracy and good linear characteristics, therefore, piezoresistive pressure sensors and static strain gauges are currently used to form a test system. Wheel pressure test method: use pressure sensor and jack to lift a group of trolley wheels at the center of the wheel of the walking platform frame, replace the force of the wheel group with a force measurement system, and directly measure the wheel group pressure of the forearm in the up, horizontal and downward state. The above test methods and Walking measuring wheel test data are intuitive and reliable, and the accuracy can be guaranteed. Disadvantages of the original wheel pressure test scheme Analysis The original wheel pressure test plan is usually arranged at the top starting point of the door seat outrigger or the trolley group hinge, as shown in Figure 2. The single wheel pressure value is tape measure clip obtained by measuring the total pressure value at the door seat outrigger by dividing the number of wheels under this outrigger, and the single wheel pressure value is obtained by dividing the pressure value at the trolley group by the number of wheels in this trolley group.