109 results about "Compound pendulum" patented technology

The invention discloses a compound pendulum frequency upconversion type wave energy collecting device. The compound pendulum frequency upconversion type wave energy collecting device comprises a shell, a compound pendulum mechanism, a driving gear, an electromagnetic power generating mechanism and a piezoelectric power generating mechanism. The shell floats on the water surface and swings along with waving, the compound pendulum mechanism is rotationally arranged in the shell and rotates along with swinging of the shell, and driving gear is rotationally arranged in the shell, and the driving gear and the compound pendulum mechanism rotate synchronously. The electromagnetic power generating mechanism is arranged in the shell and used for being in engaged transmission with the driving gear to be driven by the driving gear to generate power through electromagnetic induction. The piezoelectric power generating mechanism is arranged in the shell and located above the end face of the drivinggear and is used for generating deformation to generate power through a piezoelectric effect when the driving gear rotates. Thus, when the shell non-directionally swings along with waving, the compound pendulum mechanism generates non-directional rotation and adapts to dynamic changes of water surface wave energy, and high energy harvesting efficiency is achieved. Meanwhile, the electromagnetic power generating mechanism and the piezoelectric power generating mechanism carry out energy conversion through two different electromechanical coupling energy exchange mechanisms, the spectrum coverage range on wave energy is wide, high adaptability is achieved, and the conversion efficiency is high.

An improved start gate for gravity-driven cars which is itself a gravity-driven compound pendulum. The pendulum includes a horizontal drop member rigidly connected at one end to a start post support rod which in turn supports a plurality of start posts. A trigger lever, when moved either directly or remotely, allows the drop member to fall as in a compound pendulum thereby rotating the start posts and allowing the cars to start. The embodiment teaches that the subsequent initial start post acceleration is approximately twice the car acceleration. The equations of motion are solved showing that the start posts are guaranteed not to interfere with car motion. A major advantage over prior art spring-loaded start gates is that the gate “slap” from stopping overly-forceful spring motion and the associated track jarring and car jostling is eliminated, thereby contributing substantially to a more smooth and fair start.

The invention discloses a device and method for measuring rotational inertia of a satellite based on a torsional pendulum method and a compound pendulum method in principle and relates to the technical field of rotational inertia measuring.The device comprises a machine body, a rotary pre-twisting mechanism mounted on the top of the machine body and a workbench mounted on the top of the rotary pre-twisting mechanism.The rotary pre-twisting mechanism comprises a twisted bar, wherein the bottom end of the twisted bar is fixed to the machine body, and the top end of the twisted bar is fixed to the workbench. Fixed supporting frames are mounted on the workbench. Swing mechanisms are rotationally mounted on the fixed supporting frames through rotary shaft assemblies. A rotatable supporting rotation device is mounted on the swing mechanism.After the satellite is mounted on the supporting rotation device, the workbench and the swing mechanisms do Y-direction reciprocating swing periodic motion under the action of restoring force of the twisted bar, the swing mechanisms do X / Z-direction reciprocating swing periodic motion under the action of elastic restoring force of a tension spring and gravity of itself, the rotational inertia of the satellite in three directions can be calculated by measuring the swing periods in the Y-direction and the X / Z-direction, and measurement is convenient and fast.

The invention discloses a gravity compound pendulum-based micro force measuring device and a measuring method. In the device, a rotating shaft passes through the gravity compound pendulum and is put on a support, the compound pendulum swings an angle under effects of micro-thrust, low friction exists between the shaft and the pendulum, and thus, the micro-thrust can be sensed; the horizontal microdisplacement of the compound pendulum is measured through micro-distance sensors which are arranged in a vertical differential mode, the swinging angle is indirectly measured, and further through a moment balance relationship, the size of the micro-thrust is inversely deduced. The measuring principle and the method are simple and feasible and can reach the precision of a micro newton level; a clump weight arranged at the top end of the gravity compound pendulum can move vertically, the gravity center and the inertia of the compound pendulum are adjusted, the micro-thrust sensitivity is increased, and the influences of external vibration are reduced; the horizontal displacement of the compound pendulum is measured in a differential mode, and errors brought by environment vibration, toolingand measuring devices can be eliminated; electromagnetic damping can reduce oscillation of the compound pendulum, and influences of a disturbance torque are reduced; and besides, calibration on the micro-thrust can be directly completed through a weight calibration mode, and the operation is simple and convenient.

The invention discloses a self-locking tree rest, comprising a fixing base, a support rod and an elastic strap; the elastic strap is of ring structure and is evenly provided with a plurality of support plates, the fixing base is of ring shape and is provided with a self-locking unit, the support rod is connected with the self-locking unit, the self-locking unit includes a gear, a gear lock and a gear carrier, the support rod is fixed to the gear, the gear is rotationally arranged on the gear carrier, the gear lock includes a lock plate arranged on the gear carrier, a compound pendulum and a hanger; the lock plate is of flake structure having an opening, the compound pendulum is provided with a cavity inside and may drive the lock plate to rotate to lock the gear under the action of wind power, and accordingly the support rod is fixed. In use, the self-locking tree rest may adapt to changes in diameter of a tree according to the growth of the tree, and may also provide reinforcement for the tree.

The invention discloses a discharge port adjustment device for a compound pendulum jaw crusher. The discharge port adjustment device comprises a supporting frame, a frame and a ribbed slab for mounting of a movable jaw, wherein the supporting frame is fixedly arranged on the frame and connected with a wedge through a height adjustment device, and an adjustment block matching with the wedge is arranged at the slope side of the wedge and arranged on the frame in a way of sliding along the horizontal direction; the non-slope side of the adjustment block is connected with the ribbed slab, an iron liner is fixedly arranged between the ribbed slab and the adjustment block. The discharge port adjustment device for a compound pendulum jaw crusher has the characteristics of reasonable design, simple and compact structure, convenience in operation, convenience in maintenance, wide application range, long service life, simple production technology, low production cost and convenience in popularization and use.

The invention discloses a tree supporting frame capable of changing the support force. The tree supporting frame comprises a fixed base, support rods and an elastic bandage; the fixed base is provided with self-locking units, the support rods are connected with the self-locking units, and each self-locking unit comprises a gear, a gear lock and a gear holder, wherein the gear lock comprises a lock piece, a compound pendulum and a suspension frame which are arranged on the gear holder; a groove is formed in the portion, located below the corresponding compound pendulum, of each gear holder, each groove is internally provided with a mode adjusting device which comprises a spring, a compound pendulum adjusting block and a pulling part, each compound pendulum is located under the corresponding compound pendulum, a notch is formed in each compound pendulum adjusting block, and each mode adjusting device is used for achieving switching of the self-locking unit between an automatic locking mode and an active locking mode; the fixed base is formed by splicing four splicing pieces. Accordingly, in the using process, diameter variations of trees can be adapted automatically according to growth of the trees, and meanwhile the reinforcing function can be achieved for the trees.