Abstract: The invention provides a continuous preparation method of 2,3,3,3-tetrafluoropropene, comprising the following steps: carrying out liquid-phase catalytic telomerization reaction on ethylene and carbon tetrachloride serving as initial raw materials in the presence of a composite catalyst to obtain a reaction product; performing two-stage membrane separation and purification on the reaction product, and then sequentially performing a primary high-temperature cracking reaction, a gas-phase chlorination reaction, a secondary high-temperature cracking reaction, a primary gas-phase catalytic fluorination reaction and a secondary gas-phase catalytic fluorination reaction to obtain a reaction product; condensing and rectifying the secondary gas-phase catalytic fluorination reaction product to obtain the 2,3,3,3-tetrafluoropropene product.

Abstract: A linear actuator includes a back fixture formed of a first part, a second part, and a plastic bearing, the first part connecting with the second part, grooves are disposed inside the first part and the second part, and extra structures are disposed outside the plastic bearing. The plastic bearing is secured inside the first part and the second part with the grooves and extra structures. The back fixture can be directly fitted onto a bed frame by applying a certain force to make an elastic deformation of this back fixture, thereby accelerating the installation of the actuator. This not only significantly reduces the noise caused by the connecting portion during the operation of the actuator, but also reduces the wearing of connecting parts, thereby significantly extending maintenance-free life.

Abstract: A linear actuator includes a back fixture formed of a first part, a second part, and a plastic bearing, the first part connecting with the second part, grooves are disposed inside the first part and the second part, and extra structures are disposed outside the plastic bearing. The plastic bearing is secured inside the first part and the second part with the grooves and extra structures. The back fixture can be directly fitted onto a bed frame by applying a certain force to make an elastic deformation of this back fixture, thereby accelerating the installation of the actuator. This not only significantly reduces the noise caused by the connecting portion during the operation of the actuator, but also reduces the wearing of connecting parts, thereby significantly extending maintenance-free life.

Abstract: A linear actuator with a support that includes a bearing support frame, a bearing, a worm wheel, and a spindle, the bearing support frame being configured to support and secure the bearing, the bearing being configured to support the worm wheel and riveted to the worm wheel and the spindle; and the worm wheel and the spindle are riveted. The present invention enables the actuator to run more stably and at least doubles the service life of the product; reduces the requirement of the precision of parts such as motor housing and back fixture, and ensures that the service life of the product meet requirements even when the dimension of a few parts is inaccurate; and therefore eliminates the abnormal noise generated by the spindle of the actuator.