A self-adaptive test bench for lifeboat diesel engine

Abstract

An adaptive test bench for a lifeboat diesel engine, including a base, a load device, and a horizontal parallel iron; there are two horizontal parallel irons, which are fixedly connected to four bracket seats, and correspond to the mounting feet of the diesel engine one by one; the four bracket seats are at least Two adjacent bracket seats are provided with adjustment devices; the adjustment devices are arranged in sequence from top to bottom: screw sleeves, fixed nuts, nut seats, and positioning pins; the upper half of the inner wall of the screw sleeves is threaded, and the lower The half section is a light hole, the upper section of the outer wall of the tube is a hexagonal column, the middle section is a left-handed external stud, and the lower section is a cylinder; the upper hole of the fixing nut is provided with a left-handed internal thread, and the lower hole is a cylindrical hole, and the left-handed internal thread of the upper hole is connected to the middle section of the screw sleeve. A thread pair is formed, and the cylindrical hole of the lower hole and the lower column of the screw sleeve form a cylindrical pair; the fixed nut is fixedly connected to the nut seat; the nut seat is fixedly connected to the support frame by a positioning pin. The invention utilizes the adjustment and support function of the adjustment support to meet the installation requirements of the diesel engine test and can effectively prevent the installation screws from loosening.

Description

technical field [0001] The invention relates to a diesel engine test stand, in particular to a lifeboat diesel engine self-adaptive test stand, which belongs to the technical field of diesel engine production technology. Background technique [0002] Before the lifeboat diesel engine leaves the factory, commissioning, running-in and other test items are required. Therefore, it is necessary to install the diesel engine on the test bench. The test bench is usually on a base with a longitudinal T-shaped slot, and through T-shaped bolts, two transverse pad irons and a load device are respectively fixed. There is a bracket seat on the iron. Before the diesel engine is tested, the diesel engine and the load device are connected axially through an elastic coupling, and then the diesel engine mounting feet are fixed and connected to the bracket seat with screws. As we all know, the lifeboat diesel engine has four independent rigid mounting feet, which are rigidly connected with the...

AI Technical Summary

Problems solved by technology

As we all know, the lifeboat diesel engine has four independent rigid mounting feet, which are rigidly connected with the fuselage. In theory, in the height direction, the height of the bottom plane of each mounting foot to the centerline of the crankshaft of the diesel engine is the same, that is, The bottom planes of the four mounting feet are theoretically on the same plane. In fact, due to manufacturing errors, positioning errors, assembly errors, etc., the bottom planes of the four mounting feet are not on the same plane, but there are some errors, although it does not affect the diesel engine. The connection accuracy with the load device in the height direction, but the diesel engine mounting feet and the support frame are fixed and connected by screws, usually one of the four mounting legs will be suspended in the air, and cannot be effectively supported on the corresponding support frame at the same time

[0003] The four installation feet cannot be effectively supported on the corresponding support frame at the same time; the bottom surface of the installation foot is supported on the support frame at three points, thus causing the center of gravity of the diesel engine to be unstable, and vibration and noise will be generated during the test run of the diesel engine. It will cause the mounting feet to break. In order to ensure that the four mounting feet of the diesel engine can be effectively supported at the same time, gaskets are usually added under the suspended mounting feet. Because the suspension height of each diesel engine’s mounting feet is different, and the thickness of the gasket is limited. , therefore, this method is difficult to completely eliminate the gap between the mounting foot and the support frame, so it cannot effectively overcome the vibration and noise of the diesel engine due to the installation

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