Abstract: An electromagnetic reversal downhole pressure intensifier is provided, including a pressure intensifier and a drill bit. A nozzle and a bit water way are arranged on the drill bit, the pressure intensifier includes an electromagnetic valve seat, a pressurizing chamber, and a discharge flow pup joint; an electromagnetic valve is arranged in the electromagnetic valve seat, and an electromagnetic valve seat flow channel is arranged on the electromagnetic valve seat; a plunger is arranged in the pressurizing chamber, and the upper end of the plunger separates the inner chamber of the pressurizing chamber into a non-rod chamber and a rod chamber; a conveying pipe is arranged in the discharge flow pup joint, and a flow channel is formed between the conveying pipe and the discharge flow pup joint; the drill bit is connected to the discharge flow pup joint.

Abstract: The present utility model provides a test bed, a magnetic resonance imaging system, and a medical imaging system. The test bed includes a support frame used to bear a tested object, a base used to support the support frame, and at least one weighing assembly. The at least one weighing assembly is fixed to the base, and acquires weight information of the tested object by sensing stress from the support frame.

Abstract: The present utility model provides a test bed, a magnetic resonance imaging system, and a medical imaging system. The test bed includes a support frame used to bear a tested object, a base used to support the support frame, and at least one weighing assembly. The at least one weighing assembly is fixed to the base, and acquires weight information of the tested object by sensing stress from the support frame.