Abstract: The present application provides a metallocene compound, and a preparation method and application thereof. The metallocene compound of the present application includes a structure as shown in Formula a, where Ar is selected from a substituted or unsubstituted C6-C30 aryl; Cp? is selected from a substituted or unsubstituted cyclopentadienyl, indenyl, or fluorenyl; X is at least one of halogen, substituted or unsubstituted C1-C30 alkyl, alkoxy, substituted or unsubstituted C2-C30 dialkylamino, alkenyl, and substituted or unsubstituted C6-C30 aryl; and M is a transition metal element. The metallocene compound is suitable for catalyzing a C6-C30 long straight chain ?-olefin raw material and also a mixed long branched chain non-terminal olefin raw material, and may obtain a polymerization product with a target molecular weight according to demand.

Abstract: The present disclosure relates to a battery structure and a carrier vehicle. The battery structure includes a battery main body, a plug component, and a handle. The handle is detachably connected to the top or the side of the battery main body. The plug component includes at least one plug end. The plug end can be plugged into the battery main body and the plug component is powered on when plugged into the battery. The handle is provided with a locking piece. When the handle is connected to the top of the battery main body, the locking piece is vertically docked for locking. When the handle is connected to the side of the battery main body, the locking piece is transversely docked for locking.

Abstract: A handle head and a carrier with the same are provided, wherein the handle head includes a shell, and a handle shaft axially provided inside the shell. A first isolation component, a second isolation component and a third isolation component are assembled on and provided at intervals along an axial direction of the handle shaft and divide an accommodation space in the shell into four mutually insulated functional areas arranged along the axial direction. The four functional areas comprise a wiring harness area, an electrical component area, a magnetic induction area, and a reset control area. The wiring harness area is configured to accommodate a wiring harness, several electrical components for realizing the control function are assembled in the electrical component area, magnetic induction components and reset components are assembled in the magnetic induction area, and reset control components are configured in the reset control area.

Abstract: A carrier vehicle includes a front frame and a rear frame conveniently attachable to and detachable from the front frame. The front frame includes a frame body, at least one battery structure installed along an inner front side wall of the frame body and a connecting rod wheel component at a transverse bottom of the frame body. The rear frame comprises an operating handle, a handle joint base, a hydraulic component having an oil cylinder, a bearing component and a driving assembly. A bottom end of the operating handle is rotatably connected to the handle joint base, which includes a joint fixing base and a microswitch. The bearing component includes a bearing bridge having bridge lugs detachably connected to ends thereof, and a middle part sleeved on the oil cylinder. The front frame and rear frame are transportable in a separated compact configuration, with later simple and fast assembly.

Abstract: A cryogenic propellant rocket engine, a flowmeter calibration system and method for the cryogenic propellant rocket engine have been provided. The flowmeter calibration system for the cryogenic propellant rocket engine includes a container filling unit, a container, a supply pipeline, a weighing unit, a quick recovery container, a weighing and filling recovery unit and a recovery unit which are sequentially connected; the container filling unit is configured to connect a tank wagon with the container; and the supply pipeline includes a temperature sensor and a pressure sensor, as well as a first isolation valve, a reference flowmeter, a calibration flow adjusting manual valve, a vertical main pipe and N circumferentially and uniformly distributed horizontal pipes which are sequentially connected by a pipeline.

Abstract: A handle joint base including a joint fixing base and a microswitch detachably connected thereto, wherein a trigger component is provided in the joint fixing base, and a trigger part of the trigger component is movable relative to the joint fixing base. The microswitch includes a contact for triggering the microswitch to be turned on or off. Part of the surface of the contact is exposed outside a housing of the microswitch and is arc-shaped. An outer wall surface of a first end of the trigger part is wedge-shaped. When the trigger part is pressed downward, the wedged-shaped outer wall surface abuts and presses the arc-shaped surface of the contact, driving the contact to move into the housing to trigger the microswitch to be turned on or off. Also disclosed is a carrier vehicle in a configuration of a pallet truck having the foregoing handle joint base.

Abstract: The present disclosure relates to a battery structure and a carrier vehicle. The battery structure includes a battery main body, a plug component, and a handle. The handle is detachably connected to the top or the side of the battery main body. The plug component includes at least one plug end. The plug end can be plugged into the battery main body and the plug component is powered on when plugged into the battery. The handle is provided with a locking piece. When the handle is connected to the top of the battery main body, the locking piece is vertically docked for locking. When the handle is connected to the side of the battery main body, the locking piece is transversely docked for locking.

Abstract: A carrier vehicle includes a front frame and a rear frame conveniently attachable to and detachable from the front frame. The front frame includes a frame body, at least one battery structure installed along an inner front side wall of the frame body and a connecting rod wheel component at a transverse bottom of the frame body. The rear frame comprises an operating handle, a handle joint base, a hydraulic component having an oil cylinder, a bearing component and a driving assembly. A bottom end of the operating handle is rotatably connected to the handle joint base, which includes a joint fixing base and a microswitch. The bearing component includes a bearing bridge having bridge lugs detachably connected to ends thereof, and a middle part sleeved on the oil cylinder. The front frame and rear frame are transportable in a separated compact configuration, with later simple and fast assembly.

Abstract: A handle head and a carrier with the same are provided, wherein the handle head includes a shell, and a handle shaft axially provided inside the shell. A first isolation component, a second isolation component and a third isolation component are assembled on and provided at intervals along an axial direction of the handle shaft and divide an accommodation space in the shell into four mutually insulated functional areas arranged along the axial direction. The four functional areas comprise a wiring harness area, an electrical component area, a magnetic induction area, and a reset control area. The wiring harness area is configured to accommodate a wiring harness, several electrical components for realizing the control function are assembled in the electrical component area, magnetic induction components and reset components are assembled in the magnetic induction area, and reset control components are configured in the reset control area.

Abstract: A handle joint base including a joint fixing base and a microswitch detachably connected thereto, wherein a trigger component is provided in the joint fixing base, and a trigger part of the trigger component is movable relative to the joint fixing base. The microswitch includes a contact for triggering the microswitch to be turned on or off. Part of the surface of the contact is exposed outside a housing of the microswitch and is arc-shaped. An outer wall surface of a first end of the trigger part is wedge-shaped. When the trigger part is pressed downward, the wedged-shaped outer wall surface abuts and presses the arc-shaped surface of the contact, driving the contact to move into the housing to trigger the microswitch to be turned on or off. Also disclosed is a carrier vehicle in a configuration of a pallet truck having the foregoing handle joint base.