A210204000166 Bolt for Construction Machinery

Product Specification

PEODUCT DESCRIPTION

Connecting and fixing structural components
This is the most fundamental function of the bolts. The pump truck is composed of multiple large components, and the connections between these components are all achieved through high-strength bolts.
· Connection between the boom and the boom: The multi-section boom of the pump truck is connected by huge pin shafts and connecting ear plates. These ear plates and supports are fixed to the main structure of the boom body with a large number of high-strength bolts. They bear the weight of the boom, the weight of the concrete, and the huge bending moments and shear forces during movement.
· Connection between the slewing tower and the chassis: The slewing tower (rotation mechanism) is the core component that connects the upper vehicle (boom system) and the lower vehicle (chassis). The bolts connecting the slewing tower and the chassis beam are one of the most important bolts in the entire equipment. They bear the weight and overturning moment of the entire upper vehicle part.
· Connection between the outriggers and the chassis: When the pump truck is working, the outriggers are responsible for transferring the weight of the entire vehicle and the impact force of concrete pumping to the ground. The connecting bolts between the outrigger box and the chassis beam bear huge tension and compression alternating loads.
2. Transmitting and bearing complex loads
When the pump truck is in operation, the bolts do not merely bear simple tensile force, but instead are subjected to extremely complex combined loads:
· Alternating load: When pumping concrete, each pumping cycle will cause an impact and vibration. This repetitive impact, occurring tens to several dozen times per minute, will subject the bolts to periodic tensile and shear forces, making them highly prone to metal fatigue.
· Impact load: When the distribution valve changes direction or the flow of concrete in the pipeline suddenly becomes blocked, a huge water hammer effect occurs, generating a strong impact load that is transmitted to the bolts through the structure.
· Moment and shear force: When the boom is fully extended, it is like a huge cantilever beam, generating huge moments and shear forces at the connection point. These forces are ultimately borne by the bolt assembly.
3. Ensure the rigidity and stability of the system
The tightness of the bolt connection directly determines the contact stiffness of the connected components and the stability of the overall structure. If the pre-tightening force of the bolts is insufficient, there will be slight sliding and gaps between the connection surfaces, resulting in:
· Increased arm frame vibration: During pumping, there will be obvious shaking at the end of the arm frame, which affects the pouring accuracy and accelerates the fatigue damage of the structural components.
· Abnormal noise and wear: The mutual impact between connecting parts will generate noise and cause abnormal wear on key parts such as the pin shaft holes and connection ear plates.
· Loss of position accuracy: For parts such as the slewing support that require precise transmission, loose bolts will cause gaps, affecting the accuracy of the arm frame positioning.
4. Security Assurance
This is the most crucial function of the bolts. The failure of any critical part's bolts can lead to catastrophic consequences:
· Arm frame fracture or detachment: If the connecting bolts of the arm frame fatigue and break, the entire arm section or part of the arm may fall from a height.
· Vehicle overturning: If the connecting bolts between the turret and the chassis or the legs fail, it may cause the upper part of the vehicle to separate from the chassis or the legs to fail, resulting in the entire machine overturning.
· Component ejection: If the connecting bolts of components such as the hydraulic cylinder and the hopper of the pumping system break, the high-speed moving components may fly out like a cannonball, which is extremely dangerous.

SPECIFICATIONS

The company specializes in the production of all kinds of high, medium, low pressure dry, thin oil lubrication equipment, hydraulic components, fluid connectors, support to map customization, large volume support logo customization, welcome overseas customers to come to buy, excellent price, good quality.
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