Hydraulic press for thickening drill pipe without excavation

Abstract

The present invention relates to heavy metallurgical machinery, and is especially one kind of hydraulic press for thickening drill pipe. The hydraulic press consists of at least one vertical hydraulic press with integral frame and one horizontal hydraulic press with combined frame connected with the vertical hydraulic press. It features the horizontal walking beam centering device on the horizontal hydraulic press, and the high precision displacement sensor connected to the centering device. The hydraulic press may be used in thickening drill pipe and oil pipe, and has long service life, high product concentricity and long effective work stroke.

Description

technical field [0001] The invention relates to a plastic processing device for steel pipes of heavy metallurgical machinery, in particular to a non-excavation drill pipe thickening hydraulic machine. Background technique [0002] There are two types of steel pipe end thickening machines currently in use. The first structure was developed by German MEER company, and its frame is a "C" shaped thick steel plate structure. Two piston cylinders are respectively installed on the "C" shaped structural member frame. One of the vertical oil cylinders clamps the steel pipe for the tube blank, and one horizontal oil cylinder thickens the pipe end. The main advantage of this structure is that the structure is relatively simple, and the main disadvantages are: ① Insufficient frame rigidity, the elastic deformation of the frame when it is thickened after clamping leads to inevitable flashing of the product, which cannot meet the requirements of multi-pass subsequent processing and fina...

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Problems solved by technology

The main advantage of this structure is that the structure is relatively simple, and the main disadvantages are: ① Insufficient frame rigidity, the elastic deformation of the frame when it is thickened after clamping leads to inevitable flashing of the product, which cannot meet the requirements of multi-pass subsequent processing and final products Quality requirements, a lot of grinding must be done between processes

② Due to the uneven deformation of the frame due to insufficient rigidity, the clamping cylinder must bear a certain lateral force, which increases the wear of the cylinder body and the seal, and reduces the service life

③ The center position of the punch cannot be adjusted. Due to the inevitable eccentric force in actual production, the center cannot be adjusted, which will cause the horizontal cylinder and its piston to bear lateral force, resulting in accelerated wear of the cylinder and its seal and reduced service life.

④ The center position of the punch cannot be adjusted, resulting in a decrease in the quality of the thickened product and instability

⑤ The horizontal stroke of the punch is restricted by the structure, and it is not more than 750mm, so it is impossible to thicken the products that require a larger stroke (such as non-excavation thickened drill pipe)

The disadvantage is that ① the center position of the punch cannot be adjusted. Due to the inevitable eccentric force in actual production, the inability to adjust the center will make the horizontal cylinder and its piston bear lateral force, resulting in accelerated wear of the cylinder and reduced service life.

② The center position of the punch cannot be adjusted, resulting in a decrease in the quality of the thickened product and instability

③The horizontal stroke of the punch is restricted by the structure, and it is not more than 750mm. It is impossible to thicken the products that require a larger stroke (such as non-excavation thickened drill pipe)

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