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The present application relates to a kind of composite soil conditioner and its preparation method, suitable for the rapid improvement of desertification, sandy soil.The conditioner is composed of potassium humate, ammonium humate, potassium fulvic acid, polyacrylamide, superabsorbent resin, Tween 20 and carrier filler and slow-release nutrient regulator, etc., which can improve soil water retention, promote the formation of granules, enhance the root absorption capacity, restore soil fertility and improve crop growth conditions.The preparation method includes carrier filler drying, mixing of each component, adding polyacrylamide and superabsorbent resin, low-speed stirring and sieving packaging.Field tests show that the conditioner is superior to traditional conditioner in improving soil water-holding capacity, water-stable aggregate content and crop yield per mu, and can significantly improve the structure of desertification soil and crop growth environment.

This invention discloses an automated clamping device for welding cylindrical components of concrete pump trucks, aiming to solve the problems of time-consuming and labor-intensive manual clamping, low positioning accuracy, and inability to achieve automated welding due to improper clamping in existing technologies. The device includes a tooling platform equipped with hydraulic cylinders and multiple telescopic cylinders. The output shafts of the hydraulic cylinders are connected to a tensioning and limiting mechanism. The telescopic shafts of the telescopic cylinders are connected to a rotary clamping mechanism for fixing the medium-sized cylindrical components. A rotary clamping mechanism is also provided around the periphery of the tooling platform. The tooling platform is connected to the slewing bearing of a positioner, which can rotate the tooling platform and the cylindrical components together to facilitate welding operations. Based on the structural characteristics of large-sized and medium-sized cylindrical components, this invention assembles two clamping systems onto a single tooling, employing fully hydraulic automatic clamping for accurate positioning, which is superior to manual tooling.