Tokico, Ltd.

Hitachi, Ltd.

Sanwa Kokan Co., Ltd

Toshio Inoue

Akira Suzuki

Toshitsugu Suzuki

Harutsugu Ushiota

Masayuki Tsuchida

Yoich Mizutani

Akihiko Hama

Hiroshi Oshigami

Yoshio Konno

Hachiro Nakagawa

A steel pipe drawing apparatus, which can manufacture a drawn steel pipe which is a long object with high accuracy and at high speed as well as improves dimensional accuracy of respective thick-wall portions and cutting positions of the drawn steel pipe, is realized. When a stepped drawn steel pipe is manufactured by moving a die and a plug relatively in the same direction as a steel pipe drawing direction and in an opposite direction thereto, a first hydraulic cylinder moves the die relatively in a direction corresponding to the steel pipe drawing direction, and a second hydraulic cylinder moves the plug relatively in a direction opposite to a moving direction of the die. At this time, a position detecting sensor detects a stroke position of the second hydraulic cylinder, and a computer receives positional information detected by the position detecting sensor and controls a moving velocity of the second hydraulic cylinder. Thereby, the computer makes a moving velocity vof the second hydraulic cylinder higher than a moving velocity vthereof in 'b' region based upon a position detecting signal in 'd' region. Therefore, the drawn steel pipe is drawn at the higher moving velocity vso that no sag occurs in a wall-thickness gradient in the &#x201c;d&#x201d; region.

Steel pipe drawing apparatus and drawn steel pipe manufacturing method

The present invention relates to an air compressor assembly. The compressor assembly includes an air tank, a compressor body, and a joining part for joining the air tank and the compressor body. The air tank has an axis therealong. The compressor body adjacent to the tank has an axis therealong for supplying compressed air to the air tank, the axis of the compressor body being disposed parallel to the axis of the tank. The compressor body includes a cylinder head, the cylinder head having an axis therealong, the axis of the cylinder head being disposed perpendicular to the axis of the compressor body and inclined to the tank.

Air compressor assembly

A compressor comprises a main compressor body of compressing air, an unloader valve device provided at the suction side of the main compressor body, a bleeding pipe provided between the ejection side of the main compressor body and the unloader valve device, and a controlling valve mechanism provided inside the bleeding pipe. The controlling valve mechanism opens by detecting the fluid pressure at the ejection side of the main compressor body. Further, the unloader valve device has a check valve which opens upon-no-load operation and stopping of the operation of the main compressor body, a main valve which opens due to the air released through the bleeding pipe when the controlling valve mechanism opens, a bleeding passage for releasing the released air supplied to the suction side of the check valve, and a relief passage which communicates when the main valve opens, to release the released air to the suction side of the main compressor body.

Compressor

Growing community of inventors

Yokohama, Japan

Toshio Inoue