4results about How to "Adjustable preload" patented technology

The application relates to the technical field of valves, in particular to a ball valve with an automatic reset switch, which comprises a valve seat, a valve core built in the valve seat to control the on-off of the flow path of the valve seat, a valve cover fixedly connected to the valve seat, a valve rod fixedly connected to the valve core and rotatingly penetrating through the valve cover, and a handle fixedly connected to the upper portion of the valve rod and located above the valve cover, the valve cover is fixedly connected with a mounting frame, the mounting frame is fixedly connected with a limiting block, the handle comprises a connecting piece fixedly sleeved on the upper portion of the valve rod and a holding pipe fixedly connected to the connecting piece, the limiting block is provided with a first abutting surface and a second abutting surface for the abutment of the connecting piece, the valve seat is in an open state when the connecting piece abuts against the first abutting surface, and the valve seat is in a closed state when the connecting piece abuts against the second abutting surface, an elastic piece is arranged between the limiting block and the holding pipe and forces the connecting piece to abut against the first abutting surface under normal conditions. Under the action of the elastic piece, the holding pipe is prevented from being accidentally closed due to accidental touch or accidental rotation.

The invention provides a ball joint mechanism and a photographing holder adopting the ball joint structure, the ball joint mechanism comprises a ball body and a shell, a containing cavity extending in the axial direction is formed in the ball body, an adjusting block, an elastic piece and a ball are sequentially installed in the containing cavity, and the ball can be exposed to the outer surface of the ball body from an opening in the first end of the containing cavity; a curved surface seat is arranged at the inner bottom of the shell, the curved surface seat is provided with an inner concave surface matched with the ball, and a non-uniform gap with a deep center and a shallow edge is formed between the inner concave surface and the outer surface of the ball body; a ball handle is arranged on the ball body, an axial through hole communicated with the containing cavity is formed in the ball handle, an adjusting rod is installed in the axial through hole, the lower end of the adjusting rod is in threaded connection with an adjusting block, and the compression amount of the elastic piece is changed by operating the adjusting rod and the adjusting block. When the ball body rotates under the action of external force, rolling contact is formed between the balls and the inner concave surface of the curved-surface seat, so that the smoothness of rotation can be ensured, blockage is avoided, and a relatively large damping feeling is obtained.

This invention discloses a manual operating mechanism for a dual-gear quick-switching valve actuator, comprising a drive shaft, a gear unit, and a handwheel. The handwheel has a handwheel sleeve. The front of the drive shaft has a first positioning groove and a second positioning groove spaced apart along the axial direction. The handwheel sleeve has a positioning assembly consisting of a steel ball, a spring, and an adjusting screw. The steel ball can be embedded in either positioning groove under the spring's thrust to lock its axial position. A transmission guide pair is provided between the handwheel sleeve and the drive shaft, allowing them to rotate synchronously and move relative to each other axially. The end face of the handwheel sleeve has a sleeve toothed engagement, and the end face of the input gear has a corresponding input gear toothed engagement. The gear unit includes a meshing input gear, a first-stage reduction gear, a second-stage reduction gear, and a synchronizing gear. This invention allows for quick switching between two gears with different transmission ratios simply by pushing and pulling the handwheel, without disassembling any parts. It has the advantages of compact structure, convenient operation, and high reliability.

This invention provides an endoscope steering mechanism and an endoscope, belonging to the field of endoscope technology. It includes: a base with at least one set of output channel groups, each output channel group comprising two output channels; rotating members, the number of which is the same as the number of output channel groups, the rotating members being rotatable relative to the base; and synchronous belts, the number of which is the same as the number of output channel groups, the middle portion of the synchronous belts engaging with the rotating members, the rotating members driving the synchronous belts to move, and two output members connected to each end of each synchronous belt, each output member being located in each of the output channels and being slidable along the length of the output channel. The beneficial effect of this invention is that by engaging the synchronous belts with the rotating members and driving the output members at both ends to slide synchronously in opposite directions within the output channels, high-precision bidirectional traction control is achieved.