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Wet-type double-clutch automatic gear shifting system for petroleum drilling winch
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Forging method for air bag shell forming die of drilling pump for circulating system of petroleum drilling machine
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Die forging method for traveling block lifting ring for petroleum drilling machine lifting system
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Upper computer general HMI interface design method capable of configuring text and operation command
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Steel casting for lifting system of ultra-deep well petroleum drilling machine and manufacturing method thereof
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Laser drill bit with negative pressure suction function
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Jaw-replacement-free continuous rotation power tongs for iron roughneck
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Single-drive double-action holding forceps
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Seabed base plate hydraulic system and energy-saving control method of system
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Novel two-position six-way hydraulic control reversing valve
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Modular quick-connection rotary table hydraulic driving device
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