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The invention discloses an air pressure type artery postoperation hemostat and relates to the technical field of medical care instruments. The hemostat comprises an upper tank and a lower ring, wherein the upper tank is divided into an inner circular cavity A and an outer ring cavity A, and the inner circular cavity A and the outer ring cavity A open downwards; a one-way air inlet valve is mounted on one side of the top face of the inner circular cavity A, and a one-way air release valve is mounted on the top face of the outer ring cavity A; a puller bolt is arranged at the center of the top face of the inner circular cavity A in a threaded connection mode, and the outer side of the puller bolt is sleeved with a telescopic sealing sleeve; the lower end of the upper tank and the upper end of the lower ring are sealed in a loose joint mode; the lower ring is divided into an inner circular cavity B and an outer ring cavity B, the inner circular cavity B and the inner circular cavity A are identical in size and are sealed in a butt joint mode, and the outer ring cavity B and the outer ring cavity A are identical in size and are sealed in a butt joint mode; a cotton pad is arranged in the inner circular cavity B and soaked with etamsylate. The air pressure type artery postoperation hemostat has the advantages that negative pressure of the outer ring cavity A enables the device to be tightly adsorbed to the body of a patient without a bandage, positive pressure of the inner circular cavity A is used for balancing blood pressure to reduce bleeding, operation is easy, and time is saved.

The invention provides an airport apron pipe network constant pressure control system simulation device comprising a background computer and a simulation stand. The simulation stand comprises truckles, a framework, a color lamp system, a PLC control system, an airport sand table demonstration model and an airport apron pipe network constant pressure fluid feeding system. The advantages of the device are that various facilities and equipment and the implementation situation in the airport apron pipe network constant pressure fluid feeding system can be visually, stereoscopically and dynamicallydemonstrated through cooperative use of the airport sand table demonstration model and the airport apron pipe network constant pressure fluid feeding system and the color lamp system so that the students are enabled to master the regulations of the civil aviation industry, the idea of pipeline design, the oil product transportation situation and other actual engineering problems. The water is used as the medium to replace oil for teaching so as to be safe and convenient. The rotating speed of the oil feed pumps can be adjusted according to the pressure, the flow and other parameters in the pipe network so that the output flow and pressure of the oil feed pumps can be controlled and the requirement of simulating constant pressure refueling of different airplanes can be met.

The invention relates to a system for fixing the sending waiting condition and waiting time of CAN node report, and a relative method, wherein present technique can not effectively fix the forming time / delay of MAC mechanism and report sending; the CAN interfaces of the first communication unit (1-4), the second communication unit (2-4), and the third communication unit (3-4) are connected to the CAN bus; it comprises: (1) starting system; 92), initializing the first node (1); (3) setting the mark field, control field, and data field of first node (1); (4) pressing the first start sending button (1-5); (5) initializing the second node (2); (6) pressing the second start sending button (2-5); (7) pressing the first start sending button (1-5); (8) initializing the third node (3); (9), initializing the first node (1); (10) pressing the second start sending button (2-5). The invention can fix the forming time / delay of MAC mechanism and report sending real-time.

The invention provides table tennis training equipment. The table tennis training equipment solves the problem that the current table tennis serving machine is single in function and cannot adapt to students of different conditions to train under different states. The training equipment includes a mobile body, a rotatory base and a supporting seat capable of swing up and down; the supporting seatis fixedly connected to a hopper, the bottom of the hopper is provided with a ball outlet, a rotatable rotary disc is arranged above the ball outlet, a plurality of unit grooves are circumferentiallydistributed on the rotary disc, underneath of the ball outlet integrally communicates a ball ejection channel, the back of the ball ejection channel is provided with a guide groove, an ejection rod capable of sliding axially along the ball ejection channel is arranged in the guide groove, and the back end of the ejection rod is fixedly connected to a first pull rod and a second pull rod; and the first pull rod is fixedly connected to an ejection belt, the other end of the ejection belt is fixedly connected to a fixing rod, the fixing rod is fixedly connected to the supporting seat, and a firsttoggle rod is connected to the supporting seat in a rotary mode, and the length of the first toggle rod can be adjusted. The table tennis training equipment can be adapted to different modes of training for students with different foundations, and is high in adaptability, and increases the difficulty of training and the amount of exercise.